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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
For the Fiscal Year Ended December 31, 2023
OR
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
For the Transition Period from to
þANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Fiscal Year Ended December 31, 2017
OR
¨TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Transition Period from              to             
Commission

File Number
Registrant,
State of Incorporation,

Address and Telephone Number
I.R.S. Employer

Identification No.
1-3526The Southern Company58-069007058-0690070
(A Delaware Corporation)
30 Ivan Allen Jr. Boulevard, N.W.
Atlanta, Georgia 30308
(404) 506-5000
1-3164(A Delaware Corporation)
30 Ivan Allen Jr. Boulevard, N.W.
Atlanta, Georgia 30308
(404) 506-5000
1-3164Alabama Power Company63-000425063-0004250
(An Alabama Corporation)
600 North 18th Street
Birmingham, Alabama 35203
(205) 257-1000
1-6468(An Alabama Corporation)
600 North 18th Street
Birmingham, Alabama 35291
(205) 257-1000
1-6468Georgia Power Company58-025711058-0257110
(A Georgia Corporation)
241 Ralph McGill Boulevard, N.E.
Atlanta, Georgia 30308
(404) 506-6526
001-11229(A Georgia Corporation)
241 Ralph McGill Boulevard, N.E.
Atlanta, Georgia 30308
(404) 506-6526
001-31737Gulf Power Company59-0276810
(A Florida Corporation)
One Energy Place
Pensacola, Florida 32520
(850) 444-6111
001-11229Mississippi Power Company64-020582064-0205820
(A Mississippi Corporation)
2992 West Beach Boulevard
Gulfport, Mississippi 39501
(228) 864-1211
001-37803(A Mississippi Corporation)
2992 West Beach Boulevard
Gulfport, Mississippi 39501
(228) 864-1211
001-37803Southern Power Company58-259867058-2598670
(A Delaware Corporation)
30 Ivan Allen Jr. Boulevard, N.W.
Atlanta, Georgia 30308
(404) 506-5000
1-14174(A Delaware Corporation)
30 Ivan Allen Jr. Boulevard, N.W.
Atlanta, Georgia 30308
(404) 506-5000
1-14174Southern Company Gas58-221095258-2210952
(A Georgia Corporation)
Ten Peachtree Place, N.E.
Atlanta, Georgia 30309
(404) 584-4000

(A Georgia Corporation)
Ten Peachtree Place, N.E.
Atlanta, Georgia 30309
(404) 584-4000


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Securities registered pursuant to Section 12(b) of the Act:(1)
Each of the following classes or series of securities
RegistrantTitle of Each ClassTrading
Symbol(s)
Name of Each Exchange
on Which Registered
The Southern CompanyCommon Stock, par value $5 per shareSONew York Stock Exchange
(NYSE)
The Southern CompanySeries 2017B 5.25% Junior Subordinated Notes due 2077SOJCNYSE
The Southern CompanySeries 2020A 4.95% Junior Subordinated Notes due 2080SOJDNYSE
The Southern CompanySeries 2020C 4.20% Junior Subordinated Notes due 2060SOJENYSE
The Southern CompanySeries 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081SO 81NYSE
Georgia Power CompanySeries 2017A 5.00% Junior Subordinated Notes due 2077GPJANYSE
Southern Power CompanySeries 2016B 1.850% Senior Notes due 2026SO/26ANYSE

Securities registered pursuant to Section 12(b)12(g) of the Act is listed on the New York Stock Exchange.
Title of each classRegistrant
Common Stock, $5 par valueThe Southern Company
Junior Subordinated Notes, $25 denominations
6.25% Series 2015A due 2075
5.25% Series 2016A due 2076
5.25% Series 2017B due 2077
Class A preferred stock, cumulative, $25 stated capitalAlabama Power Company
5.00% Series
Junior Subordinated Notes, $25 denominationsGeorgia Power Company
5.00% Series 2017A due 2077
Depositary preferred shares, each representing one-fourth of a share of preferred stock, cumulative, $100 par valueMississippi Power Company
5.25% Series
��
Senior NotesSouthern Power Company
1.000% Series 2016A due 2022
1.850% Series 2016B due 2026
Securities registered pursuant to Section 12(g) of the Act:(1)
Title of each classRegistrant
Preferred stock, cumulative, $100 par valueAlabama Power Company
4.20% Series                                      4.60% Series4.72% Series        
4.52% Series                                      4.64% Series4.92% Series        
Preferred stock, cumulative, $100 par valueMississippi Power Company
4.40% Series                                      4.60% Series
4.72% Series
(1)As of December 31, 2017.


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Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

RegistrantYesNo
RegistrantYesNo
The Southern CompanyX
Alabama Power CompanyX
Georgia Power CompanyX
Gulf Power CompanyX
Mississippi Power CompanyX
Southern Power CompanyX
Southern Company GasX
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ¨ No x (Response applicable to all registrants.)
Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. Yes x No ¨
Indicate by check mark whether the registrants have submitted electronically and posted on their corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrants were required to submit and post such files). Yes x No ¨
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrants' knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.
RegistrantLarge Accelerated FilerAccelerated
Filer
Non-accelerated FilerSmaller
Reporting
Company
Registrant
Large
Accelerated
Filer
Accelerated
Filer
Non-accelerated
Filer
Smaller
Reporting
Company
Emerging Growth Company
The Southern CompanyX
Alabama Power CompanyXX
Georgia Power CompanyXX
Gulf Power CompanyX
Mississippi Power CompanyXX
Southern Power CompanyXX
Southern Company GasXX
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨


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Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.
RegistrantYesNo
The Southern CompanyX
Alabama Power CompanyX
Georgia Power CompanyX
Mississippi Power CompanyX
Southern Power CompanyX
Southern Company GasX
If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐
Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to § 240.10D-1(b). ☐
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes¨ No x (Response applicable to all registrants.)


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Aggregate market value of The Southern Company's common stock held by non-affiliates of The Southern Company at June 30, 2017: $47.92023: $76.6 billion. All of the common stock of the other registrants is held by The Southern Company. A description of each registrant's common stock follows:

Registrant
Registrant
Description of

Common Stock
Shares Outstanding at January 31, 20182024
The Southern CompanyPar Value $5 Per Share1,091,015,113 1,008,159,482
Alabama Power CompanyPar Value $40 Per Share30,537,500 30,537,500
Georgia Power CompanyWithout Par Value9,261,500 9,261,500
GulfMississippi Power CompanyWithout Par Value1,121,000 7,392,717
Mississippi Power CompanyWithout Par Value1,121,000
Southern Power CompanyPar Value $0.01 Per Share1,000 1,000
Southern Company GasPar Value $0.01 Per Share100 100
Documents incorporated by reference: specified portions of The Southern Company's Definitive Proxy Statement on Schedule 14A relating to the 20182024 Annual Meeting of Stockholders are incorporated by reference into PART III. In addition, specified portions of the Definitive Information Statements on Schedule 14C
Each of Alabama Power Company, and Mississippi Power Company relating to each of their respective 2018 Annual Meetings of Shareholders are incorporated by reference into PART III.
Each of Georgia Power Company, GulfMississippi Power Company, Southern Power Company, and Southern Company Gas meets the conditions set forth in General Instructions I(1)(a) and (b) of Form 10-K and is therefore filing this Form 10-K with the reduced disclosure format specified in General Instructions I(2)(b), (c), and (d) of Form 10-K.
This combined Form 10-K is separately filed by The Southern Company, Alabama Power Company, Georgia Power Company, Gulf Power Company, Mississippi Power Company, Southern Power Company, and Southern Company Gas. Information contained herein relating to any individual companyregistrant is filed by such companyregistrant on its own behalf. Each companyregistrant makes no representation as to information relating to the other companies.registrants.



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Table of Contents

Page
Page
I-36
III-III-11
III-III-11
III-III-11
III-III-11
III-III-22

i
i

Table of ContentsIndex to Financial Statements

DEFINITIONS
When used in Items 1 through 5 and Items 9A through 15,this Form 10-K, the following terms will have the meanings indicated.
TermMeaning
ARPGeorgia Power's Alternate Rate Plans approved by the Georgia PSC; 2019 ARP for the years 2020 through 2022 and 2022 ARP for the years 2023 through 2025
TermAFUDCMeaningAllowance for funds used during construction
Alabama PowerAlabama Power Company
BcfAMEAAlabama Municipal Electric Authority
Amended and Restated Loan Guarantee AgreementLoan guarantee agreement entered into by Georgia Power with the DOE in 2014, as amended and restated in March 2019, under which the proceeds of borrowings may be used to reimburse Georgia Power for Eligible Project Costs incurred in connection with its construction of Plant Vogtle Units 3 and 4
AOCIAccumulated other comprehensive income
AROAsset retirement obligation
ASUAccounting Standards Update
Atlanta Gas LightAtlanta Gas Light Company, a wholly-owned subsidiary of Southern Company Gas
BcfBillion cubic feet
CCRBechtelBechtel Power Corporation, the primary contractor for the remaining construction activities for Plant Vogtle Units 3 and 4
Bechtel AgreementThe 2017 construction completion agreement between the Vogtle Owners and Bechtel
CCNCertificate of convenience and necessity
CCRCoal combustion residuals
CCR RuleDisposal of Coal Combustion Residuals from Electric Utilities final rule published by the EPA in 2015
Chattanooga GasChattanooga Gas Company, a wholly-owned subsidiary of Southern Company Gas
Clean Air ActClean Air Act Amendments of 1990
CO2
Carbon dioxide
CODCommercial operation date
Contractor Settlement AgreementThe December 31, 2015 agreement between Westinghouse and the Vogtle Owners resolving disputes between the Vogtle Owners and the EPC Contractor under the Vogtle 3 and 4 Agreement
Cooperative EnergyElectric generation and transmission cooperative in Mississippi
DaltonCOVID-19The novel coronavirus disease declared a pandemic by the World Health Organization and the Centers for Disease Control and Prevention in March 2020
CPCNCertificate of public convenience and necessity
CWIPConstruction work in progress
DaltonCity of Dalton, Georgia, an incorporated municipality in the State of Georgia, acting by and through its Board of Water, Light, and Sinking Fund Commissioners
DOEDalton PipelineA pipeline facility in Georgia in which Southern Company Gas has a 50% undivided ownership interest
DOEU.S. Department of Energy
Duke Energy FloridaECCRDuke Energy Florida, LLCGeorgia Power's Environmental Compliance Cost Recovery tariff
EMCECO PlanMississippi Power's environmental compliance overview plan
ELGEffluent limitations guidelines
Eligible Project CostsCertain costs of construction relating to Plant Vogtle Units 3 and 4 that are eligible for financing under the loan guarantee program established under Title XVII of the Energy Policy Act of 2005
EMCElectric membership corporation
EPAU.S. Environmental Protection Agency
EPC ContractorWestinghouse and its affiliate, WECTEC Global Project Services Inc.; the former engineering, procurement, and construction contractor for Plant Vogtle Units 3 and 4
FERCFASBFinancial Accounting Standards Board
FCCFederal Communications Commission
FERCFederal Energy Regulatory Commission
ii

Table of ContentsIndex to Financial Statements
DEFINITIONS
(continued)

TermMeaning
FMPAFFBFlorida Municipal Power AgencyFederal Financing Bank
FFB Credit FacilitiesNote purchase agreements among the DOE, Georgia Power, and the FFB and related promissory notes which provide for two multi-advance term loan facilities
FitchFitch Ratings, Inc.
FP&LFlorida Power and Light Company
GAAPU.S. generally accepted accounting principles
Georgia PowerGeorgia Power Company
GHGGreenhouse gas
GRAMAtlanta Gas Light's Georgia Rate Adjustment Mechanism
Guarantee Settlement AgreementThe June 9, 2017 settlement agreement between the Vogtle Owners and Toshiba related to certain payment obligations of the EPC Contractor guaranteed by Toshiba
Gulf PowerGulf Power Company, until January 1, 2019 a wholly-owned subsidiary of Southern Company; effective January 1, 2021, Gulf Power Company merged with and into FP&L, with FP&L remaining as the surviving company
IBEWHeating Degree DaysA measure of weather, calculated when the average daily temperatures are less than 65 degrees Fahrenheit
Heating SeasonThe period from November through March when Southern Company Gas' natural gas usage and operating revenues are generally higher
HLBVHypothetical liquidation at book value
IBEWInternational Brotherhood of Electrical Workers
IGCCIntegrated coal gasification combined cycle, the technology originally approved for Mississippi Power's Kemper County energy facility (Plant Ratcliffe)
IICIntercompany Interchange Contract
Illinois CommissionIllinois Commerce Commission
Internal Revenue CodeInternal Revenue Code of 1986, as amended
IPPIndependent Power Producerpower producer
IRPIRAIntegrated Resource PlanInflation Reduction Act
KUAIRPKissimmee Utility AuthorityIntegrated resource plan
KWIRSKilowattInternal Revenue Service
KWHITAACKilowatt-hourInspections, Tests, Analyses, and Acceptance Criteria, standards established by the NRC
ITCInvestment tax credit
JEAJacksonville Electric Authority
KWKilowatt
KWHKilowatt-hour
LIBORLondon Interbank Offered Rate
LIFOLast-in, first-out
LNGLiquefied natural gas
LTSALong-term service agreement
MarketersMarketers selling retail natural gas in Georgia and certificated by the Georgia PSC
MEAG PowerMunicipal Electric Authority of Georgia
MergerThe merger, effective July 1, 2016, of a wholly-owned, direct subsidiary of Southern Company with and into Southern Company Gas, with Southern Company Gas continuing as the surviving corporation and a wholly-owned, direct subsidiary of Southern Company
Mississippi PowerMississippi Power Company
MWmmBtuMegawattMillion British thermal units
Moody'sMoody's Investors Service, Inc.
MPUSMississippi Public Utilities Staff
MRAMunicipal and Rural Associations
MWMegawatt
natural gas distribution utilitiesSouthern Company Gas' seven natural gas distribution utilities (Nicor Gas, Atlanta Gas Light, Company, Virginia Natural Gas, Elizabethtown Gas, Florida City Gas,and Chattanooga Gas Company, and Elkton Gas)
NCCRGeorgia Power's Nuclear Construction Cost Recovery tariff
iii

Table of ContentsIndex to Financial Statements
DEFINITIONS
(continued)

TermMeaning
NDRAlabama Power's Natural Disaster Reserve
NextEra EnergyNextEra Energy, Inc.
Nicor GasNorthern Illinois Gas Company, a wholly-owned subsidiary of Southern Company Gas
NRC
NOX
Nitrogen oxide
NRCU.S. Nuclear Regulatory Commission
NYSENYMEXNew York Mercantile Exchange, Inc.
NYSENew York Stock Exchange
OPCOCIOther comprehensive income
OPCOglethorpe Power Corporation (an Electric Membership Corporation)EMC)
OUCOTCOrlando Utilities Commission


ii

Table of ContentsIndex to Financial Statements

DEFINITIONS
(continued)

Over-the-counter
PennEast PipelinePennEast Pipeline Company, LLC, a joint venture in which Southern Company Gas has a 20% ownership interest
TermPEPMeaningMississippi Power's Performance Evaluation Plan
PATH ActPowerSecureProtecting Americans from Tax Hikes ActPowerSecure, Inc., a wholly-owned subsidiary of Southern Company
Plant Vogtle Units 3 and 4PowerSouthTwo new nuclear generating units under construction at Georgia Power's Plant VogtlePowerSouth Energy Cooperative
PPAPower purchase agreements, as well as, for Southern Power, contracts for differences that provide the owner of a renewable facility a certain fixed price for the electricity sold to the grid
PSCPublic Service Commission
PTCProduction tax credit
Rate CNPAlabama Power's Rate Certificated New Plant, consisting of Rate CNP New Plant, Rate CNP Compliance, Rate CNP PPA, and Rate CNP Depreciation
Rate ECRAlabama Power's Rate Energy Cost Recovery
Rate NDRAlabama Power's Rate Natural Disaster Reserve
Rate RSEAlabama Power's Rate Stabilization and Equalization
RegistrantsSouthern Company, Alabama Power, Georgia Power, Mississippi Power, Southern Power Company, and Southern Company Gas
ROEReturn on equity
S&PS&P Global Ratings, a division of S&P Global Inc.
SAVESteps to Advance Virginia's Energy, an infrastructure replacement program at Virginia Natural Gas
SCSSouthern Company Services, Inc., the Southern Company system service company and a wholly-owned subsidiary of Southern Company
SECU.S. Securities and Exchange Commission
SEGCOSouthern Electric Generating Company, 50% owned by each of Alabama Power and Georgia Power
SEPASoutheastern Power Administration
SequentSequent Energy Management, L.P. and Sequent Energy Canada Corp., wholly-owned subsidiaries of Southern Company Gas through June 30, 2021
SERCSERC Reliability Corporation
SNGSouthern Natural Gas Company, L.L.C., a pipeline system in which Southern Company Gas has a 50% ownership interest
SO2
Sulfur dioxide
SOFRSecured Overnight Financing Rate
Southern CompanyThe Southern Company
Southern Company GasSouthern Company Gas and its subsidiaries
Southern Company Gas CapitalSouthern Company Gas Capital Corporation, a 100%-owned subsidiary of Southern Company Gas
Southern Company power poolThe operating arrangement whereby the integrated generating resources of the traditional electric operating companies and Southern Power (excluding subsidiaries) are subject to joint commitment and dispatch in order to serve their combined load obligations
iv

Table of ContentsIndex to Financial Statements
DEFINITIONS
(continued)

TermMeaning
PowerSecurePowerSecure Inc.
PowerSouthPowerSouth Energy Cooperative
PPAPower purchase agreements, as well as, for Southern Power, contracts for differences that provide the owner of a renewable facility a certain fixed price for the electricity sold to the grid
PSCPublic Service Commission
registrantsSouthern Company, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power Company, and Southern Company Gas
RUSRural Utilities Service
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECSecurities and Exchange Commission
SEGCOSouthern Electric Generating Company
SEPASoutheastern Power Administration
SERCSoutheastern Electric Reliability Council
Southern CompanyThe Southern Company
Southern Company GasSouthern Company Gas and its subsidiaries
Southern Company Gas CapitalSouthern Company Gas Capital Corporation, a 100%-owned subsidiary of Southern Company Gas
Southern Company systemSouthern Company, the traditional electric operating companies, Southern Power, Southern Company Gas, (as of July 1, 2016), SEGCO, Southern Nuclear, SCS, Southern Linc, PowerSecure, (as of May 9, 2016), and other subsidiaries
Southern HoldingsSouthern Company Holdings, Inc., a wholly-owned subsidiary of Southern Company
Southern LincSouthern Communications Services, Inc., a wholly-owned subsidiary of Southern Company, doing business as Southern Linc
Southern NuclearSouthern Nuclear Operating Company, Inc., a wholly-owned subsidiary of Southern Company
Southern PowerSouthern Power Company and its subsidiaries
SouthStarSouthStar Energy Services, LLC (a Marketer), a wholly-owned subsidiary of Southern Company Gas
SP SolarSP Solar Holdings I, LP, a limited partnership indirectly owning substantially all of Southern Power's solar and battery energy storage facilities, in which Southern Power has a 67% ownership interest
SP WindSP Wind Holdings II, LLC, a holding company owning a portfolio of eight operating wind facilities, in which Southern Power is the controlling partner in a tax equity arrangement
SRRMississippi Power's System Restoration Rider, a tariff for retail property damage cost recovery and reserve
Subsidiary RegistrantsAlabama Power, Georgia Power, Mississippi Power, Southern Power, and Southern Company Gas
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
ToshibaToshiba Corporation, the parent company of Westinghouse
traditional electric operating companiesAlabama Power, Georgia Power, Gulf Power, and Mississippi Power
VCMVogtle Construction Monitoring
VIEVariable interest entity
Virginia CommissionVirginia State Corporation Commission
Virginia Natural GasVirginia Natural Gas, Inc., a wholly-owned subsidiary of Southern Company Gas
Vogtle 3 and 4 AgreementAgreement entered into with the EPC Contractor in 2008 by Georgia Power, acting for itself and as agent for the Vogtle Owners, and rejected in bankruptcy in July 2017, pursuant to which the EPC Contractor agreed to design, engineer, procure, construct, and test Plant Vogtle Units 3 and 4
Vogtle OwnersGeorgia Power, OPC, MEAG Power, and Dalton
WestinghouseVogtle Services AgreementThe June 2017 services agreement between the Vogtle Owners and the EPC Contractor, as amended and restated in July 2017, for the EPC Contractor to transition construction management of Plant Vogtle Units 3 and 4 to Southern Nuclear and to provide ongoing design, engineering, and procurement services to Southern Nuclear
WestinghouseWestinghouse Electric Company LLC
Williams Field Services GroupWilliams Field Services Group, LLC

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CAUTIONARY STATEMENT REGARDING
FORWARD-LOOKING INFORMATION
This Annual Report on Form 10-K contains forward-looking statements. Forward-looking statements include, among other things, statements concerning regulated rates, the strategic goals for the wholesale business, customer and sales growth, economic conditions, fuel and environmentalincluding inflation, cost recovery and other rate actions, projected equity ratios, current and proposed environmental regulations and related compliance plans and estimated expenditures, GHG emissions reduction goals, pending or potential litigation matters, access to sources of capital, projections for the qualified pension plans, postretirement benefit plans, and nuclear decommissioning trust fund contributions, financing activities, completion dates and costs of construction projects, completionmatters related to the abandonment of announced acquisitions or dispositions,the Kemper IGCC, filings with state and federal regulatory authorities, impacts of the Tax Reform Legislation, federal and state income tax benefits, estimated sales and purchases under power sale and purchase agreements, and estimated construction and other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "would," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:

the impact of recent and future federal and state regulatory changes, including tax, environmental, laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which Southern Company and its subsidiaries are subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulationsextent and IRS interpretations, actions that may be taken in response by regulatory authorities,timing of costs and its impact, if any, on the credit ratings of Southern Company and its subsidiaries;legal requirements related to CCR;
current and future litigation or regulatory investigations, proceedings, or inquiries;inquiries, including litigation and other disputes related to the Kemper County energy facility and Plant Vogtle Units 3 and 4;
the effects, extent, and timing of the entry of additional competition in the markets in which Southern Company's subsidiaries operate;
variations in demand for electricity and natural gas, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures,operate, including from the development and deployment of alternative energy sources such as self-generationsources;
variations in demand for electricity and distributed generation technologies, and any potential economic impacts resulting from federal fiscal decisions;natural gas;
available sources and costs of natural gas and other fuels;fuels and commodities;
the ability to complete necessary or desirable pipeline expansion or infrastructure projects, limits on pipeline capacity;capacity, public and policymaker support for such projects, and operational interruptions to natural gas distribution and transmission activities;
transmission constraints;
effects of inflation;
the ability to control costs and avoid cost and schedule overruns during the development, construction, and operation of facilities or other projects, including Plant Vogtle Unit 4 (which includes components based on new technology that only within the last several years began initial operation in the global nuclear industry at this scale), due to current and/or future challenges which include, the development and construction of generating facilities with designs that havebut are not been previously constructed, includinglimited to, changes in labor costs, availability, and productivity,productivity; challenges with the management of contractors or vendors; subcontractor performance; adverse weather conditions,conditions; shortages, anddelays, increased costs, or inconsistent quality of equipment, materials, and labor,labor; contractor or supplier delay, non-performancedelay; the impacts of inflation; delays due to judicial or regulatory action; nonperformance under construction, operating, or other agreements,agreements; operational readiness, including specialized operator training and required site safety programs, unforeseenprograms; engineering or design problems or any remediation related thereto; design and other licensing-based compliance matters; challenges with start-up activities, (includingincluding major equipment failure, andor system integration),integration; and/or operational performance; challenges related to pandemic health events; continued public and policymaker support for projects; environmental and geological conditions; delays or increased costs to interconnect facilities to transmission grids; and increased financing costs as a result of changes in interest rates or as a result of project delays;
the ability to overcome or mitigate the current challenges, or challenges yet to be identified, at Plant Vogtle Unit 4, as described in Note 2 to the financial statements under "Georgia Power – Nuclear Construction" in Item 8 herein, that could further impact the cost and schedule for the project;
legal proceedings and regulatory approvals and actions related to past and ongoing construction projects, including PSC approvals and FERC actions;
under certain specified circumstances, a decision by holders of more than 10% of the ownership interests of Plant Vogtle Unit 4 not to proceed with construction;
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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION
(continued)
in the event Georgia Power becomes obligated to provide funding to MEAG Power with respect to the portion of MEAG Power's ownership interest in Plant Vogtle Units 3 and 4 involving JEA, any inability of Georgia Power to receive repayment of such funding;
the ability to construct facilities in accordance with the requirements of permits and licenses (including satisfaction of NRC requirements), to satisfy any environmental performance standards and the requirements of tax credits and other incentives, and to integrate facilities into the Southern Company system upon completion of construction;
investment performance of the Southern Company system's employee and retiree benefit plans and nuclear decommissioning trust funds;
advances in technology;technology, including the pace and extent of development of low- to no-carbon energy and battery energy storage technologies and negative carbon concepts;
performance of counterparties under ongoing renewable energy partnerships and development agreements;
state and federal rate regulations and the impact of pending and future rate cases and negotiations, including rate actions relating to ROE, equity ratios, additional generating capacity, and fuel and other cost recovery mechanisms;

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the ability to successfully operate the traditional electric utilities' generating,operating companies' and SEGCO's generation, transmission, and distribution facilities, Southern Power's generation facilities, and Southern Company Gas' natural gas distribution and storage facilities and the successful performance of necessary corporate functions;
legal proceedings and regulatory approvals and actions related to Plant Vogtle Units 3 and 4, including Georgia PSC approvals and NRC actions;
litigation related to the Kemper County energy facility;
the inherent risks involved in operating and constructing nuclear generating facilities, including environmental, health, regulatory, natural disaster, terrorism, and financial risks;facilities;
the inherent risks involved in transporting and storing natural gas;
the performance of projects undertaken by the non-utility businesses and the success of efforts to invest in and develop new opportunities;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, including the proposed disposition by a wholly-owned subsidiary of Southern Company Gas of Elizabethtown Gas and Elkton Gas and the potential sale of a 33% equity interest in substantially all of Southern Power's solar assets, which cannot be assured to be completed or beneficial to Southern Company or its subsidiaries;
the possibility that the anticipated benefits from the Merger cannot be fully realized or may take longer to realize than expected and the possibility that costs related to the integration of Southern Company and Southern Company Gas will be greater than expected;
the ability of counterparties of Southern Company and its subsidiaries to make payments as and when due and to perform as required;
the ability to obtain new short- and long-term contracts with wholesale customers;
the direct or indirect effect on the Southern Company system's business resulting from cyber intrusion or physical attack and the threat of cyber and physical attacks;
global and U.S. economic conditions, including impacts from geopolitical conflicts, recession, inflation, interest rate fluctuations, and financial market conditions, and the results of financing efforts;
access to capital markets and other financing sources;
changes in Southern Company's and any of its subsidiaries' credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;ratings;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general, as well as potential impacts on the benefits of the DOE loan guarantees;
the ability of Southern Company'sthe traditional electric utilitiesoperating companies to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;
catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events, such as influenzas,political unrest, wars, or other similar occurrences;
the direct or indirect effects on the Southern Company system's business resulting from incidents affecting the U.S. electric grid, natural gas pipeline infrastructure, or operation of generating or storage resources;
impairments of goodwill or long-lived assets;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by the registrantsRegistrants from time to time with the SEC.
The registrantsRegistrants expressly disclaim any obligation to update any forward-looking statements.

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PART I
Item 1.BUSINESS
Item 1. BUSINESS
Southern Company was incorporated under the laws of Delaware on November 9, 1945. Southern Companyis a holding company that owns all of the outstanding common stock of Alabamathree traditional electric operating companies, Southern Power Georgia Power, Gulf Power,Company, and Mississippi Power, each of which is an operating public utility company. Southern Company Gas.
The traditional electric operating companies supply– Alabama Power, Georgia Power, and Mississippi Power – are each operating public utility companies providing electric service to retail customers in three Southeastern states in addition to wholesale customers in the states of Alabama, Georgia, Florida, and Mississippi. More particular information relating to each of the traditional electric operating companies is as follows:Southeast.
Alabama Power is a corporation organized under the laws of the State of Alabama on November 10, 1927, by the consolidation of a predecessor Alabama Power Company, Gulf Electric Company, and Houston Power Company. The predecessor Alabama Power Company had been in continuous existence since its incorporation in 1906.
Georgia Power was incorporated under the laws of the State of Georgia on June 26, 1930.
Gulf Power is a Florida corporation that has had a continuous existence since it was originally organized under the laws of the State of Maine on November 2, 1925. Gulf Power became a Florida corporation after being domesticated under the laws of the State of Florida on November 2, 2005.
Mississippi Power was incorporated under the laws of the State of Mississippi on July 12, 1972 and effective December 21, 1972, by the merger into it of the predecessor Mississippi Power Company, succeeded to the business and properties of the latter company. The predecessor Mississippi Power Company was incorporated under the laws of the State of Maine on November 24, 1924.
In addition, Southern Company owns all of the common stock of Southern Power Company which is also an operating public utility company. Southern Power develops, constructs, acquires, owns, and manages generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Power Company is a corporation organized under the laws of Delaware on January 8, 2001. The term "Southern Power" when used herein refers to Southern Power Company and its subsidiaries, while the term "Southern Power Company" when used herein refers only to the Southern Power parent company. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market.
Southern Company Gas which was acquired by Southern Company in July 2016, is an energy services holding company whose primary business is the distribution of natural gas in sevenfour states - Illinois, Georgia, Virginia, New Jersey, Florida,and Tennessee and Maryland - through the natural gas distribution utilities. Southern Company Gas is also involved in several other businesses that are complementary to the distribution of natural gas. Southern Company Gas was incorporated under the laws of the State of Georgia on November 27, 1995 for the primary purpose of becoming the holding company for Atlanta Gas Light Company, which was founded in 1856. See "The Southern Company System – Southern Company Gas" herein for additional information regarding agreements entered into by a wholly-owned subsidiary of Southern Company Gas to sell two of its natural gas distribution utilities.
Southern Company also owns all of the outstanding common stock or membership interests of SCS, Southern Linc, Southern Holdings, Southern Nuclear, PowerSecure, and other direct and indirect subsidiaries. SCS, the system service company, has contracted with Southern Company, each traditional electric operating company, Southern Power, Southern Company Gas,of the Subsidiary Registrants, Southern Nuclear, SEGCO, and other subsidiaries to furnish, at direct or allocated cost and upon request, the following services: general executive and advisory, general and design engineering, operations, purchasing, accounting, finance, and treasury, legal, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communication,communications, cellular tower space, and other services with respect to business and operations, construction management, and Southern Company power pool transactions. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services withinthrough its subsidiary, Southern Telecom, Inc. Southern Linc's system covers approximately 122,000 square miles in the Southeast. Southern Holdings is an intermediate holding company subsidiary, primarily for Southern Company's investmentswhich invests in leveraged leases and energy-related funds and companies, and for other electric and natural gas products and services.various projects. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants and is currently managing construction of and developingstart-up of Plant Vogtle Units 3 andUnit 4, which areis co-owned by Georgia Power. PowerSecure is a provider of productsdevelops distributed energy and services in the areas of distributed generation infrastructure, energy efficiency,resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility infrastructure.customers.
Alabama PowerSee "The Southern Company System" herein for additional information. Also see Note 15 to the financial statements in Item 8 herein for information regarding recent acquisition and Georgia Power each own 50% of the outstanding common stock of SEGCO. SEGCO is an operating public utility company that owns electric generating units with an aggregate capacity of 1,020 MWs at Plant Gaston on the Coosa River near Wilsonville, Alabama. Alabama Power and Georgia Power are each entitled to one-half of SEGCO's capacity and energy. Alabama Power acts as SEGCO's agent in the operation of SEGCO's units and furnishes fuel to SEGCO for its units.

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disposition activity. Segment information for Southern Company and Southern Company Gas is included in Note 1316 to the financial statements of Southern Company and Note 12 to the financial statements of Southern Company Gas in Item 8 herein. Alabama Power, Georgia Power, and Mississippi Power each operate with one reportable business segment, since substantially all of their business is providing electric service to customers. Southern Power also operates its business with one reportable business segment, the sale of electricity in the competitive wholesale market.
The registrants'Registrants' Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and any amendments to those reports are made available on Southern Company's website, free of charge, as soon as reasonably practicable after such material is electronically filed with or furnished to the SEC. Southern Company's internet address is www.southerncompany.com.
The Southern Company System
Traditional Electric Operating Companies
The traditional electric operating companies are vertically integrated utilities that own generation, transmission, and distribution facilities. See PROPERTIES in Item 2 herein for additional information on the traditional electric operating companies' generating facilities. Each company's transmission facilities are connected to the respective company's own generating plants and other sources of power (including certain generating plants owned by Southern Power) and are interconnected with the transmission facilities of the other traditional electric operating companies and SEGCO. For information on the State of Georgia's integrated transmission system, see "Territory Served by the Southern Company System – Traditional Electric Operating Companies and Southern Power" herein.
Agreements in effect with principal neighboring utility systems provide for capacity and energy transactions that may be entered into from time to time for reasons related to reliability or economics. Additionally, the traditional electric operating companies have entered into voluntaryvarious reliability agreements with the subsidiaries of Entergy Corporation, Florida Electric Power Coordinating Group, and Tennessee Valley Authority and with Duke Energy Progress, LLC, Duke Energy Carolinas, LLC, South Carolina Electric & Gas Company, and Virginia Electric and Power Company,certain neighboring utilities, each of which provides for the establishment and periodic review of principles and procedures for planning and operation of generation and transmission facilities, maintenance
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schedules, load retention programs, emergency operations, and other matters affecting the reliability of bulk power supply. The traditional electric operating companies have joined with other utilities in the Southeast (including some of those referred to above) to form the SERC to augment further the reliability and adequacy of bulk power supply. Through the SERC, the traditional electric operating companies are represented onat the NationalNorth American Electric Reliability Council.Corporation. In November 2022, the Southeast Energy Exchange Market (SEEM) began service. SEEM, whose members include the traditional electric operating companies and many of the other electric service providers in the Southeast, is an extension of the existing bilateral market where participants use an automated, intra-hour energy exchange to buy and sell power close to the time the energy is consumed, utilizing available unreserved transmission. On July 14, 2023, the U.S. Court of Appeals for the District of Columbia Circuit vacated certain FERC orders related to SEEM and remanded the proceeding to the FERC. The ultimate outcome of this matter cannot be determined at this time.
The utility assets of the traditional electric operating companies and certain utility assets of Southern Power Company are operated as a single integrated electric system, or Southern Company power pool, pursuant to the IIC. Activities under the IIC are administered by SCS, which acts as agent for the traditional electric operating companies and Southern Power Company. The fundamental purpose of the Southern Company power pool is to provide for the coordinated operation of the electric facilities in an effort to achieve the maximum possible economies consistent with the highest practicable reliability of service. Subject to service requirements and other operating limitations, system resources are committed and controlled through the application of centralized economic dispatch. Under the IIC, each traditional electric operating company and Southern Power Company retains its lowest cost energy resources for the benefit of its own customers and delivers any excess energy to the Southern Company power pool for use in serving customers of other traditional electric operating companies or Southern Power Company or for sale by the Southern Company power pool to third parties. The IIC provides for the recovery of specified costs associated with the affiliated operations thereunder, as well as the proportionate sharing of costs and revenues resulting from Southern Company power pool transactions with third parties.
Southern Power and Southern Linc have secured from the traditional electric operating companies certain services which are furnished at cost in compliance with FERC regulations.
Alabama Power and Georgia Power each have agreements with Southern Nuclear to operate the Southern Company system's existing nuclear plants, Plants Farley, Hatch, and Vogtle.Vogtle (Units 1, 2, and 3). In addition, Georgia Power has an agreement with Southern Nuclear to develop, license, construct, and operate Plant Vogtle Units 3 andUnit 4. See "Regulation – Nuclear Regulation" herein for additional information.

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Southern Power
Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy facilities,projects, and sells electricity at market-based rates (under authority from the FERC) in the wholesale market. Southern Power continually seeks opportunities to execute its strategy to create value through various transactions including acquisitions, dispositions, and sales of assets,partnership interests, development and construction of new generating facilities, and entry into PPAs, including contracts for differences that provide the owner of a renewable facility a certain fixed price for electricity sold to the grid, primarily with investor-owned utilities, IPPs, municipalities, electric cooperatives, and other load-serving entities, as well as commercial and industrial customers. The electricity from the natural gas generating facilities owned by Southern Power's business activities are not subject to traditional state regulation likePower is primarily sold under long-term, fixed-price capacity PPAs both with unaffiliated wholesale purchasers as well as with the traditional electric operating companies, but the majority of its business activities are subject to regulation by the FERC.companies. Southern Power has attempted to insulate itself from significant fuel supply, fuel transportation, and electric transmission risks by generally making such risks the responsibility of the counterparties to its PPAs. However, Southern Power's future earnings will depend on the parameters of the wholesale market and the efficient operation of its wholesale generating assets, as well as Southern Power's ability to execute its growth strategy and to develop and construct generating facilities. Southern Power's business activities are not subject to traditional state regulation like the traditional electric operating companies, but the majority of its business activities are subject to regulation by the FERC. For additional information on Southern Power's business activities, see MANAGEMENT'S DISCUSSION AND ANALYSIS – OVERVIEW – "Business Activities" of Southern Power in Item 7 herein.
Southern Power Company directly owns and manages generation assets primarily in the Southeast, which are included in the Southern Company power pool, and has various subsidiaries whichwhose generation assets are not included in the Southern Company power pool. These subsidiaries were created to own, operate, and operate natural gas and renewablepursue power generation facilities, either wholly or in partnership with various third parties. As ofAt December 31, 2017,2023, Southern Power's generation fleet, which is owned in part with various partners, totaled 12,94012,498 MWs of nameplate capacity in commercial operation (including 5,1525,118 MWs of nameplate capacity owned by its subsidiaries). In addition,See "Traditional Electric Operating Companies" herein for additional information on the Southern Power Company has other subsidiaries that are pursuing additional natural gas generation and other development opportunities. The generation assets of Southern Power Company's subsidiaries are not included in the power pool.
SomeA majority of Southern Power's partnerships in renewable facilities allow for the sharing of cash distributions and tax benefits at differing percentages.percentages, with Southern Power is entitledbeing the controlling partner and thus consolidating the assets and operations of
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the partnerships. At December 31, 2023, Southern Power had eight tax equity partnership arrangements where the tax equity investors receive substantially all cash distributions from eight of the partnership entitiestax benefits from the facilities, including ITCs and the respective partner who holds the class B membership interests is entitled to 49% of all cash distributions. For the Desert Stateline partnership, Southern Power is entitled to 66% of all cash distributions and the class B member is entitled to 34% of all cash distributions.PTCs. In addition, Southern Power is entitledholds controlling interests in non-tax equity partnerships with its ownership interests primarily ranging from 51% to substantially all of the federal tax benefits with respect to these nine partnership entities.
In September 2017, Southern Power began a legal entity reorganization of various direct and indirect subsidiaries that own and operate substantially all of the solar facilities, including certain subsidiaries owned in partnership with various third parties. The reorganization is expected to be substantially completed in the first quarter 2018. Southern Power is pursuing the sale of a 33% equity interest in the newly-formed holding company owning these solar assets, which, if successful, is expected to close in the middle of 2018. The ultimate outcome of this matter cannot be determined at this time.66%.
See PROPERTIES in Item 2 herein for additional detail regarding Southern Power's partnership arrangements and Note 1115 to the financial statements of Southern Power in Item 8 herein, and Note 12 to the financial statements of Southern Company under "Southern Power" in Item 8 herein for additional information regarding Southern Power's acquisitions, dispositions, construction, and development projects.
Southern Power calculates an investment coverage ratio for its generating assets, including those owned with various partners, based on the ratio of investment under contract to total investment using the respective generation facilities' net book value (or expected in-service value for facilities under construction or being acquired)construction) as the investment amount. With the inclusion of the PPAs and investments associated with the wind and natural-gas fired facilities currently under construction, and the Gaskell West 1 solar project, which was acquired subsequent to December 31, 2017, as well as other capacity and energy contracts, Southern Power has anPower's average investment coverage ratio of 91%at December 31, 2023 was 97% through 20222028 and 89% through 2027,2033, with an average remaining contract duration of approximately 1512 years. For the year ended December 31, 2023, approximately 41% of contracted MWs were with AAA to A- or equivalent rated counterparties, 47% were with BBB+ to BBB- or equivalent rated counterparties, and 10% were with unrated entities that either have ratemaking authority or have posted collateral to cover potential credit exposure.
Southern Power's electricity sales from natural gas and biomass salesgenerating facilities are primarily through long-term PPAs that consist of two types of agreements. The first type, referred to as a unit or block sale, is a customer purchase from a dedicated plant unit where all or a portion of the generation from that unit is reserved for that customer. Southern Power typically has the ability to serve the unit or block sale customer from an alternate resource. The second type, referred to as requirements service, provides that Southern Power serves the customer's capacity and energy requirements from a combination of the customer's own generating units and from Southern Power resources not dedicated to serve unit or block sales. Southern Power has rights to purchase power provided by the requirements customers' resources when economically viable. Capacity charges that form part of the PPA payments are designed to recover fixed and variable operations and maintenance costs based on dollars-per-kilowatt year and to provide a return on investment.
Southern Power's electricity sales from solar and wind generating facilities are predominantlyalso primarily through long-term PPAs; however, these solar and wind PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or provide Southern Power a certain fixed price for the electricity sold

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to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Generally, under the renewable generation PPAs, the purchasing party retains the right to keep or resell the renewable energy credits.
The following tables set forth Southern Power's PPAs as of December 31, 2017:
Block Sales PPAs
Facility/SourceCounterparty
MWs(1)

Contract Term
Addison Units 1 and 3Georgia Power297
through May 2030
Addison Unit 2MEAG Power149
through April 2029
Addison Unit 4Georgia Energy Cooperative146
through May 2030
Cleveland County Unit 1North Carolina Electric Membership Corporation (NCEMC)45-180
through Dec. 2036
Cleveland County Unit 2NCEMC183
through Dec. 2036
Cleveland County Unit 3North Carolina Municipal Power Agency 1183
through Dec. 2031
Cleveland County Unit 4
PJM Interconnection LLC(2)
183
June 2020 – May 2021
Dahlberg Units 1, 3, and 5Cobb EMC224
through Dec. 2026
Dahlberg Units 2, 6, 8, and 10Georgia Power298
through May 2025
Dahlberg Unit 4Georgia Power74
through May 2030
Franklin Unit 1Duke Energy Florida434
through May 2021
Franklin Unit 2Morgan Stanley Capital Group250
through Dec. 2025
Franklin Unit 2Jackson EMC60-65
through Dec. 2035
Franklin Unit 2GreyStone Power Corporation35-40
through Dec. 2035
Franklin Unit 2Cobb EMC100
through Dec. 2026
Franklin Unit 3Morgan Stanley Capital Group200
through Dec. 2027
Franklin Unit 3City of Dalton, Georgia70
through Dec. 2027
Harris Unit 1Georgia Power628
through May 2030
Harris Unit 2Georgia Power657
through May 2019
Harris Unit 2
Alabama Municipal Electric Authority(3)
25
Jan. 2020 – Dec. 2025
MankatoNorthern States Power Company375
through June 2026
MankatoNorthern States Power Company345
June 2019 – May 2039(4)
NacogdochesCity of Austin, Texas100
through May 2032
NCEMC PPA(5)
EnergyUnited100
through Dec. 2021
Oleander Units 2, 3, and 4Seminole Electric Cooperative466
through Dec. 2021
Oleander Unit 5FMPA157
through Dec. 2027
Rowan CT Unit 1North Carolina Municipal Power Agency 1150
through Dec. 2030
Rowan CT Unit 2
PJM Interconnection LLC(2)
154
June 2020 – May 2021
Rowan CT Units 2 and 3EnergyUnited100-175
Jan. 2022 – Dec. 2025
Rowan CT Unit 3EnergyUnited113
through Dec. 2023
Rowan CC Unit 4EnergyUnited23-328
through Dec. 2025

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Block Sales PPAs (continued)
Facility/SourceCounterparty
MWs(1)

Contract Term
Rowan CC Unit 4Duke Energy Progress, LLC150
through Dec. 2019
Rowan CC Unit 4
Century Aluminum(6)
158
through Dec. 2018
Stanton Unit AOUC342
through Sept. 2033
Stanton Unit AFMPA85
through Sept. 2033
Wansley Unit 7Jacksonville Electric Authority200
through Dec. 2019
(1)The MWs and related facility units may change due to unit rating changes or assignment of units to contracts.
(2)Amount sold into PJM capacity market.
(3)Alabama Municipal Electric Authority will also be served by Plant Franklin Unit 1 through December 2019.
(4)Subject to commercial operation of the 345-MW expansion project.
(5)Represents sale of power purchased from NCEMC under a PPA.
(6)Century Aluminum PPA is partially served by Plant Franklin Unit 3.
Requirements Services PPAs
Counterparty
MWs(1)

Contract Term
Nine Georgia EMCs294-376
through Dec. 2024
Sawnee EMC267-639
through Dec. 2027
Cobb EMC0-170
through Dec. 2026
Flint EMC136-360
through Dec. 2024
City of Dalton, Georgia92
through Dec. 2027
EnergyUnited78-159
through Dec. 2025
City of Blountstown, Florida10
through April 2022

(1)Represents forecasted incremental capacity needs over the contract term.
Solar/Wind PPAs
FacilityCounterparty
MWs(1)

Contract Term
Solar
AdobeSouthern California Edison Company20
through June 2034
ApexNevada Power Company20
through Dec. 2037
Boulder 1(2)
Nevada Power Company100
through Dec. 2036
ButlerGeorgia Power100
through Dec. 2046
Butler Solar FarmGeorgia Power20
through Feb. 2036
CalipatriaSan Diego Gas & Electric Company20
through Feb. 2036
Campo VerdeSan Diego Gas & Electric Company139
through Oct. 2033
CimarronTri-State Generation and Transmission Association, Inc.30
through Dec. 2035
Decatur CountyGeorgia Power19
through Dec. 2035
Decatur ParkwayGeorgia Power80
through Dec. 2040
Desert Stateline(2)
Southern California Edison Company300
through Sept. 2036
East PecosAustin Energy119
through April 2032
Garland A(2)
Southern California Edison Company20
through Sept. 2036
Garland(2)
Southern California Edison Company180
through Oct. 2031
GranvilleDuke Energy Progress, LLC2
through Oct. 2032
Henrietta(2)
Pacific Gas & Electric Company100
through Sept. 2036
Imperial Valley(2)
San Diego Gas & Electric Company150
through Nov. 2039

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Solar/Wind PPAs (continued)
FacilityCounterparty
MWs(1)

Contract Term
LamesaCity of Garland, Texas102
through April 2032
Lost Hills Blackwell(2)
City of Roseville, California & Pacific Gas & Electric Company32
through Dec. 2043
Macho SpringsEl Paso Electric Company50
through May 2034
MorelosPacific Gas & Electric Company15
through Feb. 2036
North Star(2)
Pacific Gas & Electric Company60
through June 2035
PawpawGeorgia Power30
through March 2046
Roserock(2)
Austin Energy157
through Nov. 2036
RutherfordDuke Energy Carolinas, LLC75
through Dec. 2031
SandhillsCobb EMC111
through Oct. 2041
SandhillsFlint EMC15
through Oct. 2041
SandhillsSawnee EMC15
through Oct. 2041
SandhillsMiddle Georgia and Irwin EMC2
through Oct. 2041
SpectrumNevada Power Company30
through Dec. 2038
Tranquillity(2)
Shell Energy North America (US), LP204
through Nov. 2019
Tranquillity(2)
Southern California Edison Company204
Dec. 2019 – Nov. 2034
Wind
BethelGoogle Inc.225
through Jan. 2029
Cactus Flats(3)
General Mills, Inc.98
Aug. 2018 – July 2034
Cactus Flats(3)
General Motors Company50
Aug. 2018 – July 2031
Grant PlainsOklahoma Municipal Power Authority41
Jan. 2020 – Dec. 2039
Grant PlainsSteelcase Inc.25
through Dec. 2028
Grant PlainsAllianz Risk Transfer (Bermuda) Ltd.81-122
through March 2027
Grant WindEast Texas Electric Cooperative50
through March 2036
Grant WindNortheast Texas Electric Cooperative50
through March 2036
Grant WindWestern Farmers Electric Cooperative50
through March 2036
Kay WindWestar Energy Inc.200
through Dec. 2035
Kay WindGrand River Dam Authority99
through Dec. 2035
PassadumkeagWestern Massachusetts Electric Company40
through June 2031
Salt Fork WindCity of Garland, Texas150
through Nov. 2030
Salt Fork WindSalesforce.com, Inc.24
through Nov. 2028
Tyler Bluff WindThe Proctor & Gamble Company96
through Dec. 2028
Wake Wind(2)
Equinix Enterprises, Inc.100
through Oct. 2028
Wake Wind(2)
Owens Corning125
through Oct. 2028
________________________
(1) MWs shown are for 100% of the PPA, which is based on demonstrated capacity of the facility.
(2) Facility is the subject of a partnership where Southern Power is the majority member. See PROPERTIES in Item 2 herein for additional information.
(3) Subject to commercial operation.
Purchased Power
Facility/SourceCounterpartyMWs
Contract Term
NCEMCNCEMC100
through Dec. 2021

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See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Power Sales Agreements" and "Acquisitions" of Southern Power in Item 7 herein and Note 11 to the financial statements of Southern Power in Item 8 herein for additional information.
For the year ended December 31, 2017, approximately 11.3% of Southern Power's revenues were derived from Georgia Power. Southern Power actively pursues replacement PPAs prior to the expiration of its current PPAs and anticipates that the revenues attributable to one customer may be replaced by revenues from a new customer; however, the expiration of any of Southern Power's current PPAs without the successful remarketing of a replacement PPA could have a material negative impact on Southern Power's earnings but is not expected to have a material impact on Southern Company's earnings.
Southern Company Gas
Southern Company Gas is an energy services holding company whose primary business is the distribution of natural gas through the natural gas distribution utilities. Southern Company Gas is also involved in several other businesses that are complementary to the distribution of natural gas, including gas marketing services, wholesale gas services,pipeline investments and gas midstream operations.marketing services. Southern Company Gas also has an "all other" non-reportable segment that includes segments below the quantitative threshold for separate disclosure. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 herein for information regarding Southern Company Gas' recent dispositions.
Gas distribution operations, the largest segment of Southern Company Gas' business, operates, constructs, and maintains 82,000approximately 77,900 miles of natural gas pipelines and 14 storage facilities, with total capacity of 158157 Bcf, to provide natural gas to residential, commercial, and industrial customers. Gas distribution operations serves approximately 4.64.4 million customers across seven states and has rates of return that are regulated by each individual state in return for exclusive franchises.
On October 15, 2017, Southern Company Gas subsidiary, Pivotal Utility Holdings Inc., entered into agreements for the sale of the assets of two of its natural gas distribution utilities, Elizabethtown Gas and Elkton Gas, to South Jersey Industries, Inc. for a total cash purchase price of $1.7 billion. As of December 31, 2017, the net book value of the assets to be disposed of in the sale was approximately $1.3 billion, which includes approximately $0.5 billion of goodwill. The goodwill is not deductible for tax purposes and, as a result, a deferred tax liability has not yet been provided. Through the completion of the asset sales, Southern Company Gas intends to invest less than $0.1 billion in capital additions required for ordinary business operations of these assets. The completion of each asset sale is subject to the satisfaction or waiver of certain conditions, including, among other customary closing conditions, the receipt of required regulatory approvals, including the FERC, the Federal Communications Commission, the New Jersey Board of Public Utilities, and, with respect to the sale of Elkton Gas, the Maryland PSC. Southern Company Gas and South Jersey Industries, Inc. made joint filings on December 22, 2017 and January 16, 2018 with the New Jersey Board of Public Utilities and the Maryland PSC, respectively, requesting regulatory approval. The asset sales are expected to be completed by the end of the third quarter 2018. The ultimate outcome of these matters cannot be determined at this time.four states.
Gas marketing services is comprised of SouthStar Energy Services, LLC (SouthStar) and Nicor Energy Services Company (doing business as Pivotal Home Solutions) and provides natural gas commodity and related services to customers in competitive markets or markets that provide for customer choice. SouthStar, serving approximately 774,000 natural gas commodity customers, markets gas to residential, commercial, and industrial customers and offers energy-related products that provide natural gas price stability and utility bill management. Pivotal Home Solutions, serving approximately 1.2 million service contracts, provides a suite of home protection products and services that offers homeowners predictability regarding their energy service delivery, systems, and appliances.
Wholesale gas servicespipeline investments primarily consists of Sequent Energy Management, L.P. and engagesjoint ventures in natural gas storage and gas pipeline arbitrage and provides natural gas asset management and related logistical services to most of the natural gas distribution utilities as well as non-affiliate companies.
Gas midstream operations includes joint ventures in pipeline investments (includingincluding a 50% ownership interest in Southern Natural Gas Company, L.L.C.SNG and two significant pipeline construction projects) as well as a 50% joint ownership interest in a significant pipeline project and wholly-ownedthe Dalton Pipeline. These natural gas storage facilities thatpipelines enable the provision of diverse sources of natural gas supplies to the customers of Southern Company Gas. Southern Natural Gas Company, L.L.C.SNG, the largest natural gas pipeline investment, is the owner of a 7,000-mile pipeline connecting natural gas supply basins in Texas, Louisiana, Mississippi, and Alabama to markets in Louisiana, Mississippi, Alabama, Florida, Georgia, South Carolina, and Tennessee.
For additional information on Southern Company Gas' business activities, see MANAGEMENT'S DISCUSSION AND ANALYSIS – OVERVIEW – "Business Activities"Gas marketing services is comprised of SouthStar, which serves approximately 665,000 natural gas commodity customers, markets gas to residential, commercial, and – FUTURE EARNINGS POTENTIAL of Southern Company Gas in Item 7 herein.
Other Businesses
PowerSecure, which was acquired by Southern Company in May 2016, providesindustrial customers and offers energy-related products and services in the areas of distributed energy infrastructure, energy efficiency,that provide natural gas price stability and utility infrastructure.

bill management in competitive markets or markets that provide for customer choice.
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Southern Holdings is an intermediate holding subsidiary, primarily for Southern Company's investments in leveraged leases and energy-related funds and companies, and also for other electric and natural gas products and services.
Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public. Southern Linc delivers multiple wireless communication options including push to talk, cellular service, text messaging, wireless internet access, and wireless data. Its system covers approximately 127,000 square miles in the Southeast. Southern Linc also provides fiber optics services within the Southeast through its subsidiary, Southern Telecom, Inc.
These efforts to invest in and develop new business opportunities may offer potential returns exceeding those of rate-regulated operations. However, these activities often involve a higher degree of risk.
Construction Programs
The subsidiary companies of Southern Company are engaged in continuous construction programs, including capital expenditures to accommodate existing and estimated future loads on their respective systems. For estimated constructionsystems and environmental expenditures for the periods 2018 through 2022, see MANAGEMENT'S DISCUSSION AND ANALYSIS – FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" of Southern Company, each traditional electric operating company, Southern Power, and Southern Company Gas in Item 7 herein. The Southern Company system's construction program consists of capital investment and capital expenditures to comply with environmental laws and regulations. The traditional electric operating companies also anticipate expenditures associated with ash pond closure and ground water monitoring under the Disposal of Coal Combustion Residuals from Electric Utilities rule (CCR Rule), which are reflected inregulations, as applicable. In 2024, the Southern Company system's asset retirement obligation liabilities. In 2018, the construction program is expected to be apportioned approximately as follows:
Southern Company
    system(a)(b)
Alabama
Power
Georgia
Power
Mississippi Power
(in billions)
New generation$1.1 $— $1.0 $— 
Environmental compliance(c)
0.1 — 0.1 — 
Generation maintenance1.3 0.5 0.7 0.1 
Transmission1.7 0.3 1.4 — 
Distribution1.7 0.5 1.1 0.1 
Nuclear fuel0.3 0.1 0.2 — 
General plant1.6 0.7 0.9 0.1 
7.8 2.1 5.4 0.3 
Southern Power(d)
0.3 
Southern Company Gas(e)
1.8 
Other subsidiaries0.1 
Total(a)
$10.0 $2.1 $5.4 $0.3 
 
Southern
Company
system(a)(b)
Alabama
Power
Georgia
Power(a)
Gulf
Power
Mississippi
Power
 (in billions)
New generation$1.3
$
$1.3
$
$
Environmental compliance(c)
1.1
0.6
0.5
0.1

Generation maintenance0.9
0.5
0.2
0.1
0.1
Transmission0.9
0.3
0.5


Distribution1.2
0.5
0.5
0.1
0.1
Nuclear fuel0.3
0.1
0.2


General plant0.5
0.2
0.2


 6.0
2.2
3.3
0.3
0.2
Southern Power(d)
1.3
    
Southern Company Gas(e)
1.7
    
Other subsidiaries0.4
    
Total(a)
$9.4
$2.2
$3.3
$0.3
$0.2
(a)Totals may not add due to rounding.
(a)Totals may not add due to rounding.
(b)Includes the traditional electric operating companies, Southern Power, and Southern Company Gas, as well as the other subsidiaries. See "Other Businesses" herein for additional information.
(c)
Reflects cost estimates for environmental regulations. These estimated expenditures do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil-fuel-fired electric generating units or costs associated with closure and groundwater monitoring under the CCR Rule. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" and FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" of Southern Company and each traditional electric operating company in Item 7 herein for additional information.
(d)Includes approximately $0.9 billion for planned expenditures for plant acquisitions and placeholder growth, which may vary materially due to market opportunities and Southern Power's ability to execute its growth strategy.
(e)
(b)Includes the Subsidiary Registrants, as well as other subsidiaries.
(c)Reflects cost estimates for environmental laws and regulations. These estimated expenditures do not include potential compliance costs associated with any future regulation of CO2 emissions from fossil fuel-fired electric generating units or the proposed ELG Supplemental Rule, or costs associated with closure and monitoring of ash ponds and landfills in accordance with the CCR Rule and the related state rules. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" and FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" in Item 7 herein for additional information. No material capital expenditures are expected for non-environmental government regulations.
(d)Does not include approximately $0.8 billion for planned acquisitions and placeholder growth, which may vary materially due to market opportunities and Southern Power's ability to execute its growth strategy.
(e)Includes costs for ongoing capital projects associated with infrastructure improvement programs for certain natural gas distribution utilities that have been previously approved by their applicable state regulatory agencies. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Infrastructure Replacement Programs and Capital Projects" of Southern Company Gas in Item 7 herein for additional information. See

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"The Southern Company System – Southern Company Gas" herein for additional information regarding agreements entered into by a wholly-owned subsidiary of Southern Company Gas to sell two of its natural gas distribution utilities. Projected capital expenditures of $0.1 billion related to these two natural gas distribution utilities are excluded fromthat have been previously approved by their applicable state regulatory agencies. See Note 2 to the amounts above.financial statements under "Southern Company Gas" in Item 8 herein for additional information.
The construction programs are subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes
The traditional electric operating companies also anticipate continued expenditures associated with closure and monitoring of ash ponds and landfills in business conditions; changes in load projections; changes in environmental lawsaccordance with the CCR Rule and regulations; the outcome of any legal challenges to the environmental rules; changes in electric generating plants, including unit retirements and replacements and adding or changing fuel sources at existing electric generating units, to meet regulatory requirements; changes in FERCrelated state rules, and regulations; state regulatory agency approvals; changeswhich are reflected in the expected environmental compliance program; changes in legislation; the cost and efficiency of construction labor, equipment, and materials; project scope and design changes; storm impacts; and the cost of capital. In addition, there can be no assurance thatapplicable Registrants' ARO liabilities. Estimated costs related to capital expenditures will be fully recovered. Additionally, planned expenditures for plant acquisitions may vary due to market opportunities and Southern Power's ability to execute its growth strategy.
In addition, the construction program includes the development and construction of new electric generating facilities with designs that have not been previously constructed, which may result in revised estimates during construction. See Note 3 to the financial statements of2024 total $728 million for Southern Company, andprimarily consisting of $346 million for Alabama Power, $338 million for Georgia Power, under "Nuclear Construction" and "Retail Regulatory Matters$24 million for Mississippi Power.
See MANAGEMENT'S DISCUSSION AND ANALYSISNuclear Construction," respectively,FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" in Item 87 herein for additional information, regarding Georgia Power'sincluding estimated expenditures for construction, environmental compliance, and closure and monitoring of Plant Vogtle Units 3ash ponds and 4.landfills for the years 2025 through 2028.
Also see "RegulationMANAGEMENT'S DISCUSSION AND ANALYSISEnvironmental Laws and Regulations"FUTURE EARNINGS POTENTIAL – "Environmental Matters" in Item 7 herein for additional information with respect to certain existing and proposed environmental requirements and PROPERTIES – "Electric – Jointly-Owned Facilities" and – "Natural Gas – Jointly-Owned Facilities"Properties" in Item 2 herein and Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for additional information concerning Alabama Power's, Georgia Power's, and Southern Power'sthe Registrants' joint ownership of certain generating units and related facilities with certain non-affiliated utilities and Southern Company Gas' joint ownership of a pipeline facility.facilities.
Financing Programs
See each of the registrant's MANAGEMENT'S DISCUSSION AND ANALYSIS – FINANCIAL CONDITION AND LIQUIDITY in Item 7 herein and Note 68 to the financial statements of each registrant in Item 8 herein for information concerning financing programs.
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Fuel Supply
Electric
The traditional electric operating companies' and SEGCO's supply of electricity is primarily fueled by natural gas and coal.coal, as well as nuclear for Alabama Power and Georgia Power. Southern Power's supply of electricity is primarily fueled by natural gas. See MANAGEMENT'S DISCUSSION AND ANALYSIS – RESULTS OF OPERATION – "Electricity"Southern Company – Electricity Business – Fuel and Purchased Power Expenses" of Southern Company and MANAGEMENT'S DISCUSSION AND ANALYSIS – RESULTS OF OPERATION under "Fuel and Purchased Power Expenses" for each of eachthe traditional electric operating companycompanies in Item 7 herein for information regarding the electricity generated and the average cost of fuel in cents per net KWH generated for the years 2015 through 2017.
The traditional electric operating companies have agreements in place from which they expect to receive substantially all of their 2018 coal burn requirements. These agreements have terms ranging between one2022 and four years. In 2017, the weighted average sulfur content of all coal burned by the traditional electric operating companies was 1.12%. This sulfur level, along with banked and purchased sulfur dioxide allowances, allowed the traditional electric operating companies to remain within limits set by Phase I of the Cross-State Air Pollution Rule (CSAPR) under the Clean Air Act. In 2017, the Southern Company system did not purchase any sulfur dioxide allowances, annual nitrogen oxide emission allowances, or seasonal nitrogen oxide emission allowances from the market. As any additional environmental regulations are proposed that impact the utilization of coal, the traditional electric operating companies' fuel mix will be monitored to help ensure that the traditional electric operating companies remain in compliance with applicable laws and regulations. Additionally, Southern Company and the traditional electric operating companies will continue to evaluate the need to purchase additional emissions allowances, the timing of capital expenditures for emissions control equipment, and potential unit retirements and replacements. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" of Southern Company, each traditional electric operating company, and Southern Power in Item 7 herein for additional information on environmental matters.2023.
SCS, acting on behalf of the traditional electric operating companies and Southern Power Company, has agreements in place for the natural gas burn requirements of the Southern Company system. For 2018,2024, SCS has contracted for 510620 Bcf of natural gas supply under agreements with remaining terms up to 1510 years. In addition to natural gas supply, SCS has contracts in place

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for both firm natural gas transportation and storage. Management believes these contracts provide sufficient natural gas supplies, transportation, and storage to ensure normal operations of the Southern Company system's natural gas generating units. See "Natural Gas" herein for information on the natural gas market.
The traditional electric operating companies have agreements in place from which they expect to receive substantially all of their 2024 coal burn requirements. These agreements have terms ranging between one and three years. Fuel procurement specifications, emission allowances, environmental control systems, and fuel changes have allowed the traditional electric operating companies to remain within limits set by applicable environmental regulations. As new environmental regulations are proposed that impact the utilization of coal, the traditional electric operating companies' fuel mix will be monitored to help ensure compliance with applicable laws and regulations. Southern Company and the traditional electric operating companies will continue to evaluate the need to purchase additional emissions allowances, the timing of capital expenditures for environmental control equipment, and potential unit retirements and replacements. While none of Southern Company's subsidiaries are currently subject to renewable portfolio standards or similar requirements, management of the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" in Item 7 herein and Note 2 to the financial statements under "Alabama Power – Environmental Accounting Order," "Georgia Power – Integrated Resource Plans," and "Mississippi Power – Integrated Resource Plan" in Item 8 herein for additional information, including the Southern Company system's electric generating mix and plans to retire or convert to natural gas certain coal-fired generating capacity.
Alabama Power and Georgia Power have multiple contracts covering their nuclear fuel needs for uranium, conversion services, enrichment services, and fuel fabrication. The uranium, conversion services, and fuel fabrication contracts are forwith remaining terms of less than 10 years with varying expiration dates. The term lengths for the enrichment services contracts are for less than 15 years with varying expiration dates.up to 11 years. Management believes suppliers have sufficient nuclear fuel production capability to permit the normal operation of the Southern Company system's nuclear generating units.
Changes in fuel prices to the traditional electric operating companies are generally reflected in fuel adjustment clauses contained in rate schedules. See "Rate Matters – Rate Structure and Cost Recovery Plans" herein for additional information. Southern Power's natural gas and biomass PPAs generally provide that the counterparty is responsible for substantially all of the cost of fuel.
Alabama Power and Georgia Power also have contracts with the United States, acting through the DOE, that provide for the permanent disposal of spent nuclear fuel. The DOE failed to begin disposing of spent fuel in 1998, as required by the contracts, and Alabama Power and Georgia Power have pursued and are pursuing legal remedies against the government for breach of contract. See Note 3 to the financial statements of Southern Company, Alabama Power, and Georgia Power under "Nuclear Fuel Disposal Costs" in Item 8 herein for additional information.
Changes in fuel prices to the traditional electric operating companies are generally reflected in fuel adjustment clauses contained in rate schedules. See "Rate Matters – Rate Structure and Cost Recovery Plans" herein for additional information. Southern Power's natural gas PPAs generally provide that the counterparty is responsible for substantially all of the cost of fuel.
Natural Gas
Recent advancesNatural gas remains a volatile commodity. Slight supply and demand imbalances can quickly result in significant price moves both up and down. These price movements may be short-lived, but the impacts can be pronounced. Natural gas supplies, primarily from the Permian and Haynesville regions, have continued to grow; however, this growth has been accompanied by LNG export growth. Forward curves project prices will remain in the range of mid-to high- $3 per mmBtu, approaching $4 per mmBtu, through 2030; however, short-term price volatility is expected and future prices could be materially impacted by various factors, including unexpected geopolitical events as well as government policies related to natural gas drilling in shale producing regions of the United States have resulted in historically high supplies of natural gasinfrastructure development, production, and relatively low prices for natural gas. Procurementexports.
Southern Company Gas' procurement plans for natural gas supply and transportation to serve regulated utility customers are reviewed and approved by the state regulatory agencies in which Southern Company Gasthe states where it operates. Southern Company Gas purchases natural gas supplies in the open market by contracting with producers and marketers and, from its wholly-owned subsidiary, Sequent Energy Management, L.P.,for Atlanta Gas Light and Chattanooga Gas, under asset management agreements in states where such agreements are approved by the applicable state regulatory agency. Southern Company Gas also contracts
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for transportation and storage services from interstate pipelines that are regulated by the FERC. When firm pipeline services are temporarily not needed, Southern Company Gas may release the services in the secondary market under FERC-approved capacity release provisions or utilize asset management arrangements, thereby reducing the net cost of natural gas charged to customers for most of the natural gas distribution utilities. Peak-use requirements are met through utilization of company-owned storage facilities, pipeline transportation capacity, purchased storage services, peaking facilities, and other supply sources, arranged by either transportation customers or Southern Company Gas.
With the exception of Atlanta Gas Light, the natural gas distribution utilities are authorized by the relevant regulatory agencies in the states in which they serve to use natural gas cost recovery mechanisms that adjust rates to reflect changes in the wholesale cost of natural gas and ensure recovery of all costs prudently incurred in purchasing natural gas for customers. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" in Item 8 herein for additional information.
Territory Served by the Southern Company System
Traditional Electric Operating Companies and Southern Power
The territory in which the traditional electric operating companies provide retail electric service comprises most of the states of Alabama and Georgia, together with the northwestern portion of Florida and southeastern Mississippi. In this territory there are non-affiliated electric distribution systems that obtain some or all of their power requirements either directly or indirectly from the traditional electric operating companies. As of December 31, 2017,2023, the territory had an area of approximately 120,000116,000 square miles and an estimated population of approximately 17 million. Southern Power sells wholesale electricity at market-based rates in the wholesale market,across various U.S. utility markets, primarily to investor-owned utilities, IPPs, municipalities, and other load-serving entities, as well as commercial and industrial customers.
Alabama Power is engaged, within the State of Alabama, in the generation, transmission, distribution, and purchase of electricity and the sale of electric service, at retail in approximately 400 cities and towns (including Anniston, Birmingham, Gadsden, Mobile, Montgomery, and Tuscaloosa), as well as in rural areas, and at wholesale to 1411 municipally-owned electric distribution systems, 11all of which are served indirectly through sales to the Alabama Municipal Electric Authority,AMEA, and two rural distributing cooperative associations. The sales contract with AMEA will expire on December 31, 2025. In addition, Alabama Power owns coal reserves near its Plant Gorgas and uses the output of coal from the reserves in its generating plants. Alabama Power also sells, and cooperates with dealers in promoting the sale of, electric appliances and products and also markets and sells outdoor lighting services.
Georgia Power is engaged in the generation, transmission, distribution, and purchase of electricity and the sale of electric service within the State of Georgia, at retail in over 600 communities530 cities and towns (including Athens, Atlanta, Augusta, Columbus, Macon, Rome, and Savannah), as well as in rural areas, and at wholesale to OPC, MEAG Power, Dalton, various EMCs, and non-affiliated utilities. Georgia Power also markets and sells outdoor lighting services.

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Gulf Power is engaged, within the northwestern portion of Florida, in the generation, transmission, distribution,services and purchase of electricity and the sale of electric service, at retail in 71 communities (including Pensacola, Panama City, and Fort Walton Beach), as well as in rural areas, and at wholesale to a non-affiliated utility.other customer-focused utility services.
Mississippi Power is engaged in the generation, transmission, distribution, and purchase of electricity and the sale of electric service within 23 counties in southeastern Mississippi, at retail in 123 communities (including Biloxi, Gulfport, Hattiesburg, Laurel, Meridian, and Pascagoula), as well as in rural areas, and at wholesale to one municipality, six rural electric distribution cooperative associations, and one generating and transmitting cooperative.
The following table provides the number of retail customers served by customer classification for the traditional electric operating companies at December 31, 2023:
Alabama PowerGeorgia PowerMississippi Power
Total(*)
(in thousands)
Residential1,328 2,406 157 3,890 
Commercial207 329 34 570 
Industrial11 — 17 
Other— 10 
Total(*)
1,541 2,754 192 4,487 
(*)Totals may not add due to rounding.
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For information relating to KWH sales by customer classification for the traditional electric operating companies, see MANAGEMENT'S DISCUSSION AND ANALYSIS – RESULTS OF OPERATIONS of each traditional electric operating company in Item 7 herein. For information relating to the number of retail customers served by customer classification for the traditional electric operating companies, see SELECTED FINANCIAL DATA of each traditional electric operating company in Item 6 herein. Also, for information relating to the sources of revenues for Southern Company, each traditional electric operating company, and Southern Power, reference is made tosee Item 7 herein and Note 1 to the financial statements under "Revenues – Traditional Electric Operating Companies" and " – Southern Power" and Note 4 to the financial statements in Item 8 herein.
The RUS has authority to make loans to cooperative associations or corporations to enable them to provide electric service to customers in rural sections of the country. As of December 31, 2017,2023, there were approximately 62 electric cooperative distribution systems operating in the territoryterritories in which the traditional electric operating companies provide electric service at retail or wholesale.
One of these organizations, PowerSouth is a generating and transmitting cooperative selling power to several distributing cooperatives, municipal systems, and other customers in south Alabama and northwest Florida.Alabama. As of December 31, 2017,2023, PowerSouth owned generating units with approximately 2,100more than 1,600 MWs of nameplate capacity, including an undivided 8.16% ownership interest in Alabama Power's Plant Miller Units 1 and 2. PowerSouth's facilities were financed with RUS loans secured by long-term contracts requiring distributing cooperatives to take their requirements from PowerSouth to the extent such energy is available. See PROPERTIES – "Jointly-Owned"Electric – Jointly-Owned Facilities" in Item 2 herein and Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for detailsadditional information.
In accordance with an agreement executed in 2021, Alabama Power began providing approximately 100 MWs of year-round capacity service to PowerSouth on February 1, 2024.
In 2021, Alabama Power's joint-ownershipPower and PowerSouth began operations under a coordinated planning and operations agreement, with PowerSoutha minimum term of 10 years. The agreement includes combined operations (including joint commitment and dispatch) and real-time energy sales and purchases and is expected to create energy cost savings and enhanced system reliability for both parties. Projected revenues are expected to offset any increased administrative costs incurred by Alabama Power. Under the agreement, Alabama Power has the right to participate in a portion of Plant Miller. Alabama Power has a system supply agreement with PowerSouth to provide 200 MWs of capacity service through December 31, 2030 with an option to extend and renegotiate in the event Alabama Power builds new generation or contracts for new capacity.PowerSouth's future incremental load growth.
Alabama Power and Gulf Power have entered intoalso has a separate agreementsagreement with PowerSouth involving interconnection between their respective systems. The delivery of capacity and energy from PowerSouth to certain distributing cooperatives in the service territoriesterritory of Alabama Power and Gulf Power is governed by the Southern Company/PowerSouth Network Transmission Service Agreement. The rates for this service to PowerSouth are on file with the FERC.
OPC is an EMC owned by its 38 retail electric distribution cooperatives, which provide retail electric service to customers in Georgia. OPC provides wholesale electric power to its members through its generation assets, some of which are jointly owned with Georgia Power, and power purchased from other suppliers.
Four OPC and the 38 retail electric cooperative associations, financed bydistribution cooperatives are members of Georgia Transmission Corporation, an EMC (GTC), which provides transmission services to its members and third parties. See PROPERTIES – "Electric – Jointly-Owned Facilities" in Item 2 herein and Note 5 to the RUS, operate within Gulffinancial statements under "Joint Ownership Agreements" in Item 8 herein for additional information regarding Georgia Power's service territory. These cooperatives purchase their full requirements from PowerSouth and SEPA (a federal power marketing agency). A non-affiliated utility also operates within Gulf Power's service territory and purchases its full requirements from Gulf Power.jointly-owned facilities.
Mississippi Power has an interchange agreement with Cooperative Energy, a generating and transmitting cooperative, pursuant to which various services are provided. Cooperative Energy also has a 10-year network integration transmission service agreement with SCS for transmission service to certain delivery points on Mississippi Power's transmission system through March 31, 2031. See Note 2 to the financial statements under "Mississippi Power – Municipal and Rural Associations Tariff" in Item 8 herein for information on a separate shared service agreement between Mississippi Power and Cooperative Energy.
As of December 31, 2017,2023, there were approximately 72 municipally-owned electric distribution systems operating in the territory in which the traditional electric operating companies provide electric service at retail or wholesale.
As of December 31, 2017,2023, 48 municipally-owned electric distribution systems and one county-owned system received their requirements through MEAG Power, which was established by a Georgia state statute in 1975.Power. MEAG Power serves these requirements from self-owned generation facilities, some of which are jointly-owned with Georgia Power, and purchases from other resources. MEAG Power also has a pseudo scheduling and services agreement with Georgia Power. Dalton serves its requirements from self-owned generation facilities, some of which are jointly-owned with Georgia Power, and through purchases from Georgia Power and Southern Power through a service agreement. See PROPERTIES – "Jointly-Owned"Electric – Jointly-Owned Facilities" in Item 2 herein and Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for additional information.
Georgia Power has entered into substantially similar agreements with Georgia Transmission Corporation,GTC, MEAG Power, and Dalton providing for the establishment of an integrated transmission system to carry the power and energy of all parties. The agreements require an investment by each party in the integrated transmission system in proportion to its respective share of the aggregate system load. See PROPERTIES – "Jointly-Owned"Electric – Jointly-Owned Facilities" in Item 2 herein for additional information.

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Southern Power assumed or entered intohas PPAs with some of the traditional electric operating companies,Georgia Power, investor-owned utilities, IPPs, municipalities, electric cooperatives, and other load-serving entities, as well as commercial and industrial customers. See "The Southern Company System – Southern Power" aboveherein and MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Power"Southern Power's Power Sales Agreements" of Southern Power in Item 7 herein for additional information concerning Southern Power's PPAs.information.
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SCS, acting on behalf of the traditional electric operating companies, also has a contract with SEPA providing for the use of the traditional electric operating companies' facilities at government expense to deliver to certain cooperatives and municipalities, entitled by federal statute to preference in the purchase of power from SEPA, quantities of power equivalent to the amounts of power allocated to them by SEPA from certain U.S. government hydroelectric projects.
Southern Company Gas
Southern Company Gas is engaged in the distribution of natural gas in sevenfour states through the natural gas distribution utilities. The natural gas distribution utilities construct, manage, and maintain intrastate natural gas pipelines and distribution facilities. Details of the natural gas distribution utilities at December 31, 20172023 are as follows:
UtilityStateNumber of customersApproximate miles of pipe
(in thousands)
Nicor GasIllinois2,276 34.7 
Atlanta Gas LightGeorgia1,714 35.6 
Virginia Natural GasVirginia313 5.9 
Chattanooga GasTennessee71 1.7 
Total4,374 77.9 
UtilityStateNumber of customers
Approximate miles of pipe
  (in thousands) 
Nicor GasIllinois2,228
34,300
Atlanta Gas Light CompanyGeorgia1,622
33,500
Virginia Natural GasVirginia299
5,600
Elizabethtown Gas(*)
New Jersey292
3,200
Florida City GasFlorida109
3,700
Chattanooga Gas CompanyTennessee66
1,600
Elkton Gas(*)
Maryland7
100
Total 4,623
82,000
(*)For information relating to the pending asset sales of Elizabethtown Gas and Elkton Gas, see MANAGEMENT'S DISCUSSION AND ANALYSIS – OVERVIEW – "Merger, Acquisition, and Disposition Activities" of Southern Company Gas in Item 7 herein and Note 11 to the financial statements of Southern Company Gas under "Proposed Sale of Elizabethtown Gas and Elkton Gas" in Item 8 herein.
For information relating to the sources of revenue for Southern Company Gas, see MANAGEMENT'S DISCUSSION AND ANALYSISItem 7 herein and Note 1 to the financial statements under "Revenues RESULTS OF OPERATIONS and – FUTURE EARNINGS POTENTIAL of Southern Company GasGas" and Note 4 to the financial statements in Item 78 herein.
Competition
Electric
The electric utility industry in the U.S. is continuing to evolve as a result of regulatory and competitive factors. Among the early primary agents of change was the Energy Policy Act of 1992, which allowed IPPs to access a utility's transmission network in order to sell electricity to other utilities.
The competition for retail energy sales among competing suppliers of energy is influenced by various factors, including price, availability, technological advancements, service, and reliability. These factors are, in turn, affected by, among other influences, regulatory, political, and environmental considerations, taxation, and supply.
The retail service rights of all electric suppliers in the State of Georgia are regulated by the Territorial Electric Service Act of 1973. Pursuant to the provisions of this Act, all areas within existing municipal limits were assigned to the primary electric supplier therein. Areas outside of such municipal limits were either to be assigned or to be declared open for customer choice of supplier by action of the Georgia PSC pursuant to standards set forth in this Act. Consistent with such standards,Act, the Georgia PSC has assigned substantially all of the land area in the state to a supplier. Notwithstanding such assignments, this Act provides that any new customer locating outside of 1973 municipal limits and having a connected load of at least 900 KWs may exercise a one-time choice for the life of the premises to receive electric service from the supplier of its choice.
Pursuant to the 1956 Utility Act, the Mississippi PSC issued "Grandfather Certificates" of public convenience and necessity to Mississippi Power and to six distribution rural cooperatives operating in southeastern Mississippi, then served in whole or in part by Mississippi Power, authorizing them to distribute electricity in certain specified geographically described areas of the state. The six cooperatives serve approximately 325,000 retail customers in a certificated area of approximately 10,300 square miles. In areas included in a "Grandfather Certificate," the utility holding such certificate may extend or maintain its electric

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system subject to certain regulatory approvals; extensions of facilities by such utility, or extensions of facilities into that area by other utilities, may not be made except uponunless the Mississippi PSC grants a showing of, and a grant of a certificate of, public convenience and necessity.CPCN. Areas included in such a certificateCPCN that are subsequently annexed to municipalities may continue to be served by the holder of the certificate,CPCN, irrespective of whether it has a franchise in the annexing municipality. On the other hand, the holder of the municipal franchise may not extend service into such newly annexed area without authorization by the Mississippi PSC.
Generally, the traditional electric operating companies have experienced, and expect to continue to experience, competition in their respective retail service territories in varying degrees from the development and deployment of alternative energy sources such as self-generation (as described below) and distributed generation technologies, as well as other factors. Further technological advancements or the implementation of policies in support of alternative energy sources may result in further competition.
Southern Power competes with investor-owned utilities, IPPs, and others for wholesale energy sales across various U.S. utility markets. The needs of these markets are driven by the demands of end users and the generation available. Southern Power's success in wholesale energy sales is influenced by various factors including reliability and availability of Southern Power's plants, availability of transmission to serve the demand, price, and Southern Power's ability to contain costs.
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As of December 31, 2017,2023, Alabama Power had cogeneration contracts in effect with eightseven industrial customers. Under the terms of these contracts, Alabama Power purchases excess energy generated by such companies. During 2017,2023, Alabama Power purchased approximately 98113 million KWHs from such companies at a cost of $3 million.companies. The related costs were immaterial.
As of December 31, 2017,2023, Georgia Power had contracts in effect with 27to purchase generation from 36 small power producers whereby Georgia Power purchases their excess generation.IPPs. During 2017,2023, Georgia Power purchased 1.65.9 billion KWHs from such companies at a cost of $114$303 million. Georgia Power also has PPAs for electricity with fourseven cogeneration facilities. Payments are subject to reductions for failure to meet minimum capacity output. During 2017,2023, Georgia Power purchased 26349 million KWHs at a cost of $0.7$31 million from these facilities.
Also during 2017, Georgia Power purchased energy from three customer-owned generating facilities. These customers provide only energy to Georgia Power, make no capacity commitment, and are not dispatched by Georgia Power. During 2017, Georgia Power purchased a total of 317 million KWHs from the three customers at a cost of approximately $25 million.
As of December 31, 2017, Gulf Power had agreements in effect with various industrial, commercial, and qualifying facilities pursuant to which Gulf Power purchases "as available" energy from customer-owned generation. During 2017, Gulf Power purchased 277 million KWHs from such companies for approximately $7 million.
As of December 31, 2017,2023, Mississippi Power had a cogeneration agreement in effect with one of its industrial customers. Under the terms of this contract, Mississippi Power purchases any excess generation. During 2017,2023, Mississippi Power did not purchasemake any excess generation from this customer.such purchases.
Natural Gas
Southern Company Gas' natural gas distribution utilities do not compete with other distributors of natural gas in their exclusive franchise territories but face competition from other energy products. Their principal competitors are electric utilities and fuel oil and propane providers serving the residential, commercial, and industrial markets in their service areas for customers who are considering switching to or from a natural gas appliance.
Competition for heating as well as general household and small commercial energy needs generally occurs at the initial installation phase when the customer or builder makes decisions as to which types of equipment to install. Customers generally use the chosen energy source for the life of the equipment.
Customer demand for natural gas could be affected by numerous factors, including:
changes in the availability or price of natural gas and other forms of energy;
general economic conditions;
energy conservation, including state-supported energy efficiency programs;
legislation and regulations;regulations, including certain bans on the use of natural gas in new or existing construction and electrification initiatives;
the cost and capability to convert from natural gas to alternative energy products; and
technological or regulatory changes resulting in displacement or replacement of natural gas appliances.
TheSouthern Company Gas has natural gas-related programs that generally emphasize natural gas as the fuel of choice for customers and seek to expand the use of natural gas through a variety of promotional activities. In addition, Southern Company Gas partners with third-party entities to market the benefits of natural gas appliances.
The availability
Seasonality and affordability of natural gas have provided cost advantages and further opportunity for growth of the businesses.

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SeasonalityDemand
The demand for electric power and natural gas supply is affected by seasonal differences in the weather. While the electric power sales of some electric utilities peak in the summer, others peak in the winter. In most of the areasaggregate, during normal weather conditions, the traditional electric operating companies serve,Southern Company system's electric power sales peak during both the summer with a smaller peak during the winter, while inand winter. In most of the areas Southern Company Gas serves, natural gas demand peaks during the winter. As a result, the overall operating results of Southern Company, the traditional electric operating companies, Southern Power, and Southern Company GasRegistrants in the future may fluctuate substantially on a seasonal basis. In addition, Southern Company, the traditional electric operating companies, Southern Power, and Southern Company GasSubsidiary Registrants have historically sold less power and natural gas when weather conditions are milder.
See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "General" and – RESULTS OF OPERATIONS – "Southern Company Gas" in Item 7 herein for information regarding trends in market demand for electricity and natural gas and the impact of seasonality on Southern Company Gas' business, respectively.
Regulation
State CommissionsStates
The traditional electric operating companies and the natural gas distribution utilities are subject to the jurisdiction of their respective state PSCs or applicable state regulatory agencies. These regulatory bodies have broad powers of supervision and regulation over public utilities operating in the respective states, including their rates, service regulations, sales of securities (except for the Mississippi PSC), and, in the cases of the Georgia PSC and the Mississippi PSC, in part, retail service territories. See "Territory Served by the Southern Company System" and "Rate Matters" herein for additional information.
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Federal Power Act
The traditional electric operating companies, Southern Power Company and certain of its generation subsidiaries, and SEGCO are all public utilities engaged in wholesale sales of energy in interstate commerce and, therefore, are subject to the rate, financial, and accounting jurisdiction of the FERC under the Federal Power Act. The FERC must approve certain financings and allows an "at cost standard" for services rendered by system service companies such as SCS and Southern Nuclear. The FERC is also authorized to establish regional reliability organizations which enforce reliability standards, address impediments to the construction of transmission, and prohibit manipulative energy trading practices.
Alabama Power and Georgia Power are also subject to the provisions of the Federal Power Act or the earlier Federal Water Power Act applicable to licensees with respect to their hydroelectric developments. As of December 31, 2017,2023, among the hydroelectric projects subject to licensing by the FERC are 14 existing Alabama Power generating stations having an aggregate installed capacity of 1,670,0001.7 million KWs and 17 existing Georgia Power generating stations and one generating station partially owned by Georgia Power, with a combined aggregate installed capacity of 1,087,2961.1 million KWs.
In 2013, the FERC issued a new 30-year license to Alabama Power for Alabama Power's seven hydroelectric developments on the Coosa River (Weiss, Henry, Logan Martin, Lay, Mitchell, Jordan, and Bouldin). Alabama Power filed a petition requesting rehearing of the FERC order granting the relicense seeking revisions to several conditions of the license. Alabama Rivers Alliance, American Rivers, the Georgia Environmental Protection Division, and the Atlanta Regional Commission also filed petitions for rehearing of the FERC order. In April 2016, the FERC issued an order granting in part and denying in part Alabama Power's rehearing request. The order also denied all of the other rehearing requests. In May 2016,American Rivers and Alabama Rivers Alliance and American Riversalso filed a second rehearing requestmultiple appeals of the FERC's 2013 order for the new 30-year license and, in June 2016, also filed a petition with2018, the U.S. Court of Appeals for the District of Columbia Circuit for review ofvacated the licenseorder and remanded the rehearing denial order. The FERCproceeding to the FERC. Alabama Power continues to operate the Coosa River developments under annual licenses issued an order in September 2016 denyingby the second rehearing request, and American Rivers andFERC.
In 2021, Alabama Rivers Alliance subsequentlyPower filed an appeal of that order atapplication with the U.S. Court of Appeals for the District of Columbia Circuit. The U.S. Court of Appeals for the District of Columbia Circuit consolidated the two appeals into one proceeding.
In 2017, Alabama Power continued the process of developing an applicationFERC to relicense the Harris Dam project on the Tallapoosa River, which is expected to be filed with the FERC by November 30, 2021.River. The currentoriginal Harris Dam project license will expireexpired on November 30, 2023.2023 and, on December 13, 2023, the FERC issued an annual license for the continued operation of the Harris Dam project. The Harris Dam project will operate under annual licenses until a new long-term license is issued, which is expected by the first half of 2025.
In 2017,2018, Georgia Power continuedfiled applications to surrender the processLangdale and Riverview hydroelectric projects on the Chattahoochee River upon their license expirations on December 31, 2023. Although the projects are not operational, the closure of developingthe projects is subject to the closure requirements to be enforced in accordance with future FERC surrender orders.
In 2021, Georgia Power filed an application with the FERC to relicense the Wallace Dam project on the Oconee River. The current Wallace Dam project license will expire on June 1, 2020. Georgia Power's hydro electric licenses expiring in 2023 include the Lloyd Shoals project on the RiverviewOcmulgee River. The current Lloyd Shoals project license expired on December 31, 2023. Subsequent to December 31, 2023, the FERC authorized Georgia Power to continue operation of the Lloyd Shoals project under the terms and conditions of the Langdale project. The FERC relicensing proceedings for these three projects are expected to begin in 2018.prior license until the issuance of a subsequent license.
Georgia Power and OPC also have a license, expiring in 2027,2026, for the Rocky Mountain Plant,project, a pure pumped storage facility of 847,800903,000 KW installed capacity. In 2021, OPC, as an agent for co-licensees of the project, filed a notice of intent with the FERC to relicense the project. An application to relicense the project is expected to be filed with the FERC by December 31, 2024. See PROPERTIES – "Jointly-Owned"Electric – Jointly-Owned Facilities" in Item 2 herein for additional information.
Licenses for all projects, excluding those discussed above, expire in the years 2023-2066 in the case of2034-2066 for Alabama Power's projects and in the years 2035-2044 in the case of2034-2060 for Georgia Power's projects.
Upon or after the expiration of each license, the U.S. Government, by act of Congress, may take over the project or the FERC may relicense the project either to the original licensee or to a new licensee. In the event of takeover or relicensing to another,

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the original licensee is to be compensated in accordance with the provisions of the Federal Power Act, such compensation to reflect the net investment of the licensee in the project, not in excess of the fair value of the property, plus reasonable damages to other property of the licensee resulting from the severance therefrom of the property. The FERC may grant relicenses subject to certain requirements that could result in additional costs.
The ultimate outcome of these matters cannot be determined at this time.
Nuclear Regulation
Alabama Power, Georgia Power, and Southern Nuclear are subject to regulation by the NRC. The NRC is responsible for licensing and regulating nuclear facilities and materials and for conducting research in support of the licensing and regulatory process, as mandated by the Atomic Energy Act of 1954, as amended; the Energy Reorganization Act of 1974, as amended; and the Nuclear Nonproliferation Act of 1978, as amended; and in accordance with the National Environmental Policy Act of 1969, as amended, and other applicable statutes. These responsibilities also include protecting public health and safety, protecting the environment, protecting and safeguarding nuclear materials and nuclear power plants in the interest of national security, and assuring conformity with antitrust laws.
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The NRC licenses for Georgia Power's Plant Hatch Units 1 and 2 expire in 2034 and 2038, respectively. Southern Nuclear has notified the NRC of its intent in the third quarter 2025 to seek to renew the plant's licenses for an additional 20 years (through 2054 and 2058 for Units 1 and 2, respectively). The NRC licenses for Alabama Power's Plant Farley Units 1 and 2 expire in 2037 and 2041, respectively. The NRC licenses for Plant Vogtle Units 1, 2, 3, and 24 expire in 2047, 2049, 2062, and 2049,2063, respectively.
In 2012, See Note 2 to the NRC issued combined construction and operating licenses (COLs)financial statements under "Georgia Power – Nuclear Construction" in Item 8 herein for additional information on Plant Vogtle Units 3 and 4. Receipt of4, including the COLs allowed full constructionprojected in-service date for Unit 4.
See Notes 3 and 6 to begin. the financial statements under "Nuclear Insurance" and "Nuclear Decommissioning," respectively, in Item 8 herein for additional information.
Environmental Laws and Regulations
See "Construction Programs" herein, MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Nuclear Construction" of Georgia Power"Environmental Matters" in Item 7 herein, and Note 3 to the financial statements of Southern Company under "Nuclear Construction""Environmental Remediation" and Georgia Power under "Retail Regulatory Matters – Nuclear Construction" in Item 8 herein for additional information.
See Notes 1 and 9Note 6 to the financial statements of Southern Company, Alabama Power, and Georgia Power in Item 8 herein for information on nuclear decommissioning costs and nuclear insurance.
Environmental Laws and Regulations
The Southern Company system's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, and protection of other natural resources. Compliance with these existing environmental requirements involves significant capital and operating costs, a major portion of which is expected to be recovered through existing ratemaking provisions or through market-based contracts. There is no assurance, however, that all such costs will be recovered. For Southern Company Gas, substantially all of these costs are related to former manufactured gas plants sites, which are primarily recovered through existing ratemaking provisions. See Note 3 to the financial statements of Southern Company Gas under "Environmental Matters" in Item 8 herein for additional information.
Compliance with federal environmental laws and resulting regulations has been, and will continue to be, a significant focus for Southern Company, each traditional electric operating company, Southern Power, SEGCO, and Southern Company Gas. New or revisedconcerning environmental laws and regulations could affect many areas ofimpacting the traditional electric operating companies', Southern Power's, and the natural gas distribution utilities' operations. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" of Southern Company and each of the traditional electric operating companies in Item 7 herein for additional information about environmental issues, including, but not limited to, proposed and final regulations related to air quality, water quality, CCRs, and global climate issues. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" of Southern Power in Item 7 herein for additional information about environmental issues and global climate issues. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" of Southern Company Gas in Item 7 herein for additional information about environmental remediation liabilities.Registrants.
The Southern Company system's ultimate environmental compliance strategy, including potential electric generating unit retirement and replacement decisions, and future environmental capital expenditures will depend on various factors, such as state-level adoption and implementation of requirements, the availability and cost of any deployed control technology, and the outcome of pending and/or future legal challenges. Compliance costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, and adding or changing fuel sources for certain existing units, as well as related upgrades to the transmission system. Environmental compliance spending over the next several years may differ materially from the amounts estimated. Such expenditures could affect results of operations, cash flows, and financial condition if such costs are not recovered on a timely basis through regulated rates for the traditional electric operating companies and the natural gas distribution utilities or through long-term wholesale agreements for the traditional electric operating companies and Southern Power. Further, higher costs that are recovered through regulated rates

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could contribute to reduced demand for energy, which could negatively affect results of operations, cash flows, and financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affect their demand for electricity and natural gas. See "Construction Program" herein and MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" of Southern Company, each of the traditional electric operating companies, Southern Power, and Southern Company Gas in Item 7 herein for additional information. The ultimate outcome of these matters cannot be determined at this time.
Rate Matters
Rate Structure and Cost Recovery Plans
Electric
The rates and service regulations of the traditional electric operating companies are uniform for each class of service throughout their respective retail service territories. Rates for residential electric service are generally of the block type based upon KWHs used and include minimum charges. Residential and other rates contain separate customer charges. Rates for commercial service are presentlyalso of the block type and, for large customers, the billing demand is generally used to determine capacity and minimum bill charges. These large customers' rates are generally based upon usage by the customer and include rates with special features to encourage off-peak usage. Additionally, Alabama Power Gulf Power, and Mississippi Power are generally allowed by their respective state PSCs to negotiate the terms and cost of service to large customers. Such terms and cost of service, however, arecustomers, subject to final state PSC approval.
The traditional electric operating companies recover certain costs through a variety of forward-looking, cost-based rate mechanisms. Fuel and net purchased energy costs are recovered through specific fuel cost recovery provisions. These fuel cost recovery provisions are adjusted to reflect increases or decreases in such costs as needed or on schedules as required by the respective PSCs. Approved compliance, storm damage, and certain other costs are recovered at Alabama Power Gulf Power, and Mississippi Power through specific cost recovery mechanisms approved by their respective PSCs. Certain similar costs at Georgia Power are recovered through various base rate tariffs as approved by the Georgia PSC. Costs not recovered through specific cost recovery mechanisms are recovered at Alabama Power and Mississippi Power through annual, formulaic cost recovery proceedings and at Georgia Power and Gulf Power through periodic base rate proceedings.
See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Regulatory Matters" of Southern Company and each of the traditional electric operating companies in Item 7 herein and Note 32 to the financial statements of Southern Company and each of the traditional electric operating companies under "Retail Regulatory Matters" in Item 8 herein for a discussion of rate matters and certain cost recovery mechanisms. Also see Note 1 to the financial statements of Southern Company and each of the traditional electric operating companies in Item 8 herein for a discussion of recovery of fuel costs, storm damage costs, and compliance costs through rate mechanisms.
See "Integrated Resource Planning" herein for a discussion of Georgia PSC certification of new demand-side or supply-side resources for Georgia Power. In addition, see MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Nuclear Construction" of Georgia Power in Item 7 herein and Note 3 to the financial statements of Southern Company under "Nuclear Construction" and Georgia Power under "Retail Regulatory Matters – Nuclear Construction" in Item 8 herein for a discussion of the Georgia Nuclear Energy Financing Act and the Georgia PSC certification of Plant Vogtle Units 3 and 4, which have allowed Georgia Power to recover financing costs for construction of Plant Vogtle Units 3 and 4 during the construction period beginning in 2011.
See Note 3 to the financial statements of Southern Company and Mississippi Power under "Kemper County Energy Facility" in Item 8 herein and MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Kemper County Energy Facility – Rate Recovery" of Mississippi Power in Item 7 herein for information on cost recovery plans with respect to the Kemper County energy facility.additional information.
The traditional electric operating companies and Southern Power Company and certain of its generation subsidiaries are authorized by the FERC to sell power to non-affiliates, including short-term opportunity sales, at market-based prices. Specific FERC approval must be obtained with respect to a market-based contract with an affiliate. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "FERC Matters" of each of the registrants in Item 7 herein for information on the traditional electric operating companies' and Southern Power Company's market-based rate authority and pending FERC proceedings relating to this authority.
Mississippi Power servesprovides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs, which are subject to regulation by the FERC. The contracts with these wholesale customers represented 19.3%14.0% of Mississippi Power's total operating revenues in 2017 and are largely subject to rolling 10-2023.

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year cancellation notices. Historically, these wholesale customers have acted as a group and any changes in contractual relationships for one customer are likely to be followed by the other wholesale customers.
Natural Gas
Southern Company Gas' seven natural gas distribution utilities are subject to regulation and oversight by their respective state regulatory agencies with respect to rates charged to their customers, maintenance of accounting records, and various service and safety matters.agencies. Rates charged to these customers vary according to customer class (residential, commercial, or industrial) and rate jurisdiction. These agencies approve rates designed to provide each natural gas distribution utility the opportunity to generate revenues to recover all prudently-incurred costs, including a return on rate base sufficient to pay interest on debt and provide a reasonable return. Rate base generally consists of the original cost of the utility plant in service, working capital, and certain other assets, less accumulated depreciation on the utility plant in service and net deferred income tax liabilities, and may include certain other additions or deductions.ROE.
With the exception of Atlanta Gas Light, Company, whichthe earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are largely a function of weather conditions and price levels for natural gas. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from customer consumption changes. Atlanta Gas Light operates in a deregulated environment in which gas marketersMarketers rather than a traditional utility sell natural gas to end-use customers and earns revenue by charging rates to its customers based primarily on monthly fixed charges that are set by the Georgia PSC, the earningsPSC.
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The natural gas distribution utilities, excluding Atlanta Gas Light Company, are authorized to use natural gas cost recovery mechanisms that allow them to adjust their rates to reflect changes in the wholesale cost of natural gas and to ensure they recover all of the costs prudently incurred in purchasing natural gas for their customers. In addition to natural gas cost recovery mechanisms, the natural gas distribution utilities have other cost recovery mechanisms such asand regulatory riders, which vary by utility, but allow recovery of certain costs, such as those related to infrastructure replacement programs as well as environmental remediation, and energy efficiency plans.plans, and bad debts.
See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Regulatory Matters – Utility Regulation and Rate Design" of Southern Company Gas in Item 7 herein and Note 32 to the financial statements of Southernunder "Southern Company Gas under "Regulatory Matters"Gas" in Item 8 herein for a discussion of rate matters and certain cost recovery mechanisms.
Integrated Resource Planning
Each of the traditional electric operating companies continually evaluates its electric generating resources in order to ensure that it maintains a cost-effective and reliable mix of resources to meet the existing and future demand requirements of its customers. In addition, each year the Southern Company system engages in a scenario planning process, developing scenarios which look out over a 30-year horizon. In 2023, scenarios included a wide range of fuel prices, load growth, and CO2 prices starting between $0 and $50 per metric ton of CO2 emitted and escalating over the 30-year horizon. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Laws and Regulations" aboveMatters" in Item 7 herein for a discussion of existing and potential environmental regulations that may impact the future generating resource needs of the traditional electric operating companies.
Certaincompanies, as well as a discussion of the traditionalSouthern Company system's continued generating fleet transition.
Alabama Power
Triennially, Alabama Power provides an IRP report to the Alabama PSC. This report overviews Alabama Power's resource planning process and contains information that serves as the foundation for certain decisions affecting Alabama Power's portfolio of supply-side and demand-side resources. The IRP report facilitates Alabama Power's ability to provide reliable and cost-effective electric operating companies are requiredservice to file IRPs with their respective statecustomers, while accounting for the risks and uncertainties inherent in planning for resources sufficient to meet expected customer demand. Under State of Alabama law, a CCN must be obtained from the Alabama PSC as discussed below.before Alabama Power constructs any new generating facility, unless such construction is an ordinary extension of an existing system in the usual course of business. Alabama Power provided its most recent IRP to the Alabama PSC during 2022. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" in Item 8 herein for additional information.
Georgia Power
Triennially, Georgia Power must file an IRP with the Georgia PSC that specifies how it intends to meet the future electric service needs of its customers through a combination of demand-side and supply-side resources. The Georgia PSC, under state law, must certify any new demand-side or supply-side resources for Georgia Power to receive cost recovery. Once certified, the lesser of actual or certified construction costs and purchased power costs is recoverable through rates. Certified costs may be excluded from recovery only on the basis of fraud, concealment, failure to disclose a material fact, imprudence, or criminal misconduct.
In July 2022, the Georgia PSC approved Georgia Power's 2022 IRP, as modified by a stipulated agreement among Georgia Power, the staff of the Georgia PSC, and certain intervenors and as further modified by the Georgia PSC. On October 27, 2023, Georgia Power filed an updated IRP (2023 IRP Update) with the Georgia PSC, which sets forth a plan to support the recent increase in the state of Georgia's projected energy needs since the 2022 IRP. Georgia Power expects the Georgia PSC to render a final decision on the 2023 IRP Update on April 16, 2024. The ultimate outcome of this matter cannot be determined at this time. See Note 32 to the financial statements of Southern Company under "Regulatory Matters – Georgia"Georgia Power – RateIntegrated Resource Plans" and " – Integrated Resource Plan" and "Nuclear Construction" andRate Plans" in Item 8 herein for additional information. Also see Note 32 to the financial statements of Georgiaunder "Georgia Power under "Retail Regulatory Matters Rate Plans," "– Integrated Resource Plan," and "– Nuclear Construction" in Item 8 herein for additional information.
Gulf Power
Annually by April 1, Gulf Power must file a 10-year site plan withinformation on the Florida PSC containing Gulf Power's estimate of its power-generating needs in the periodGeorgia Nuclear Energy Financing Act and the general location of its proposed power plant sites. The 10-year site plans submitted by the state's electric utilities are reviewed by the FloridaGeorgia PSC and subsequently classified as either "suitable" or "unsuitable." The Florida PSC then reports its findings along with any suggested revisions to the Florida Department of Environmental Protection for its consideration at any subsequent electrical power plant site certification proceedings. Under

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Florida law, any 10-year site plans submitted by an electric utility are considered tentative information for planning purposes only and may be amended at any time at the discretion of the utility with written notification to the Florida PSC.
Gulf Power's most recent 10-year site plan was classified by the Florida PSC as "suitable" in November 2017. The plan identifies environmental regulations and potential legislation or regulation that would impose mandatory restrictions on greenhouse gas emissions. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Air Quality," "– Environmental Laws and Regulations – Coal Combustion Residuals," and "– Global Climate Issues" of Gulf Power in Item 7 herein.
As a result of the cost to comply with environmental regulations imposed by the EPA, Gulf Power retired its coal-fired generation at Plant Smith Units 1 and 2 (357 MWs) in March 2016. In August 2016, the Florida PSC approved Gulf Power's request to reclassify the remaining net book value of Plant SmithVogtle Units 13 and 24, which have allowed Georgia Power to recover certain financing costs for construction of Plant Vogtle Units 3 and the remaining materials and supplies associated with these units as of the retirement date, totaling approximately $63 million, to a regulatory asset. Gulf Power began amortizing the investment balances over 15 years effective January 1, 2018 as determined in a rate case settlement agreement approved by the Florida PSC on April 4, 2017.4.
Mississippi Power
Mississippi Power's 2010 IRP indicated that, among other things,Triennially, Mississippi Power planned to construct the Kemper County energy facility asmust file an IGCC to meet its identified needs, to add environmental controls at Plant Daniel Units 1 and 2, to defer environmental controls at Plant Watson Units 4 and 5, and to continue operation of the combined cycle Plant Daniel Units 3 and 4. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Air Quality" and "– Global Climate Issues" of Mississippi Power in Item 7 herein.
On February 6, 2018,IRP with the Mississippi PSC, approvedas well as an update at approximately the mid-point of the three-year cycle. The IRP must include long-term plans to best meet the needs of electric utility customers through a settlement agreement relatedcombination of demand-side and supply-side resources and considering transmission needs. The IRP filing is not intended to cost recoverysupplant or replace the Mississippi PSC's existing regulatory processes for petition and approval of CPCNs for new generating resources. Mississippi Power's most recent IRP was filed in 2021 and the Kemper County energy facility, pursuantnext IRP is expected to whichbe filed in April 2024. Mississippi Power agreed tomust also file a Reserve Margin Plan (RMP) by August 2018. The RMP will include manyan annual report on energy delivery improvements, the latest of the same aspects of a traditional IRP, but the RMP will also contain alternatives proposed by Mississippi Power to address its current capacity which iswas filed in excess of Mississippi Power's long-term targeted reserve margin. The ultimate outcome of this matter cannot be determined at this time.
For additional information regarding the Kemper County energy facility, see MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Kemper County Energy Facility" of Mississippi Power in Item 7 herein andNovember 2023. See Note 32 to the financial statements of Southern Company and Mississippiunder "Mississippi Power under "Kemper County Energy Facility"– Integrated Resource Plan" in Item 8 herein.herein for additional information.
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Human Capital
Southern Company system management is committed to attracting, developing, and retaining a sustainable workforce and aims to foster a diverse, equitable, inclusive, and innovative culture. The Southern Company system's values – safety first, intentional inclusion, act with integrity, and superior performance – guide behavior. The Southern Company system had a total of 31,344approximately 28,100 employees on its payroll at December 31, 2017.
2023 comprised of the following:
At December 31, 2023(*)
Alabama Power6,200
Georgia PowerEmployees at December 31, 20176,600
AlabamaMississippi Power6,613
1,000
GeorgiaSouthern Power6,986
500
Gulf Power1,288
Mississippi Power1,242
PowerSecure1,448
SCS3,740
Southern Company Gas5,318
4,800
Southern NuclearSCS3,936
4,200
Southern PowerNuclear541
3,800
OtherPowerSecure and other232
1,000
Total Southern Company system31,344
28,100
(*)Numbers are rounded to 100s.
All Southern Company system employees are located within the United States. Part-time employees represent less than 1% of total employees.
Southern Company system management values a diverse, equitable, and inclusive workforce. Southern Company's subsidiaries have policies, programs, and processes to help ensure that all groups are represented, included, and fairly treated across all job levels. The Southern Company Board of Directors and management believe that diversity is important to provide different perspectives on risk, business strategy, and innovation. Southern Company management leads the Southern Company system's diversity, equity, and inclusion initiatives and employee recruitment, retention, and development efforts. The Board, principally through its Compensation and Talent Development Committee, oversees these efforts. Southern Company system management utilizes its "Moving to Equity" initiative that focuses on five key areas: talent, work environment, supplier inclusion, civic engagement, and community investment and social justice. This initiative demonstrates the Southern Company system's commitments, highlights key results, and tracks progress on long-term goals.
Southern Company system management supports employee resource groups, diversity councils, mentoring programs, and inclusion teams to provide formal networks of colleagues that can help promote belonging, improve employee retention, and support development. At December 31, 2023, people of color and women represented 30% and 25%, respectively, of the Southern Company system's workforce.
Southern Company system management recognizes the importance of attracting and retaining an appropriately qualified workforce. Southern Company system management uses a variety of strategies to attract and retain talent, including working with high schools, technical schools, universities, and military installations to fill many entry-level positions. The recruiting strategy also includes partnerships with professional associations and local communities to recruit mid-career talent. The addition of external hires augments the existing workforce to meet changing business needs, address any critical skill gaps, and supplement and diversify the Southern Company system's talent pipeline.
The Southern Company system supports the well-being of its employees through a comprehensive total rewards strategy with three measurable categories: physical, financial, and emotional well-being. The Southern Company system provides competitive salaries, annual incentive awards for nearly all employees, and health, welfare, and retirement benefits. The Southern Company system has a qualified defined benefit, trusteed pension plan and a qualified defined contribution, trusteed 401(k) plan which provides a competitive company matching contribution. Substantially all Southern Company system employees are eligible to participate in these plans. There are differences between the pension plan benefit formulas based on when and by which subsidiary an employee is hired. See Note 11 to the financial statements for additional information. At December 31, 2023, the average age of the Southern Company system employees was 44 and the average tenure with the Southern Company system was 14 years. Turnover rate, calculated as the percent of employees that terminated employment with the Southern Company system, including voluntary and involuntary terminations and retirements, divided by total employees, was 8.3%.
Southern Company system management is committed to developing talent and helping employees succeed by providing development opportunities along with purposeful people moves as part of individual development plans and succession planning processes. The Southern Company system has multiple development programs, including programs targeted toward all
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employees, high potential employees, first-level managers, managers of managers, and executives. Additionally, Southern Company system management strives to deliver consistent needs-based training and solutions as workplace needs evolve.
Southern Company system management believes the safety of employees and customers is paramount. The Southern Company system seeks to meet or exceed applicable laws and regulations while continually improving its safety technologies and processes. The Southern Company System Safety and Health Council, which includes leaders from each Registrant, works collectively across the Southern Company system to provide safety leadership, share learning, work collaboratively to address safety-related issues, and govern the consistency of safety programs. The safety programs are focused on the prevention and elimination of life-altering events, serious injuries, and fatalities. These programs include continuous process improvements to put critical controls in place to prevent serious injuries, promote learning, and implement appropriate corrective actions. In 2023, the Southern Company system had zero fatalities and a serious injury rate of 0.06, which represents the number of incidents per 100 employees (calculated by taking the number of serious injuries multiplied by 200,000 workhours and divided by the total employee workhours during the year). A serious injury is one that is life-threatening or life-changing (temporary or permanent) for the employee. Serious injury examples, as defined by applicable safety regulators, include fatalities, amputations, trauma to organs, certain bone fractures, certain soft tissue injuries, severe burns, and eye injuries.
The Southern Company system also has longstanding relationships with labor unions. The traditional electric operating companies, Southern Nuclear, and the natural gas distribution utilities have separate agreements with local unions of the IBEW, which generally apply to operating, maintenance, and construction employees. These agreements cover wages, benefits, terms of the Utilities Workers Union of America generally covering wages,pension plans, working conditions, and procedures for handling grievances and arbitration. These agreements apply with certain exceptions to operating, maintenance, and construction employees.
Alabama Power has agreementsThe Southern Company system also partners with the IBEW in effect through August 15, 2019. Upon notice given at least 60 days prior to that date, negotiations may be initiatedprovide training programs to develop technical skills and career opportunities.
At December 31, 2023, approximately 32% of Southern Company system employees were covered by agreements with respect to agreement terms to be effective after such date.

unions, with agreements expiring between 2024 and 2029.
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Georgia Power has an agreement with the IBEW covering wages and working conditions, which is in effect through June 30, 2021.
Gulf Power has an agreement with the IBEW covering wages and working conditions, which is in effect through April 15, 2019. Upon notice given at least 60 days prior to that date, negotiations may be initiated with respect to agreement terms to be effective after such date.
Mississippi Power has an agreement with the IBEW covering wages and working conditions, which is in effect through May 1, 2019. In 2015, Mississippi Power signed a separate agreement with the IBEW related solely to the Kemper County energy facility; that current agreement is in effect through March 15, 2021. In August 2017, Mississippi Power signed an agreement with the IBEW that added several job classifications and provided guidelines related to the reorganization at the Kemper County energy facility.
Southern Nuclear has a five-year agreement with the IBEW covering certain employees at Plants Hatch and Plant Vogtle Units 1 and 2, which is in effect through June 30, 2021. A five-year agreement between Southern Nuclear and the IBEW representing certain employees at Plant Farley is in effect through August 15, 2019. Upon notice given at least 60 days prior to that date, negotiations may be initiated with respect to agreement terms to be effective after such date.
The agreements also make the terms of the pension plans for the companies discussed above subject to collective bargaining with the unions at either a five-year or a 10-year cycle, depending upon union and company actions.
The natural gas distribution utilities have separate agreements with local unions of the IBEW and Utilities Workers Union of America covering wages, working conditions, and procedures for handling grievances and arbitration. Nicor Gas' agreement with the IBEW is effective through February 29, 2020. Virginia Natural Gas' agreement with the IBEW is effective through May 16, 2020. Elizabethtown Gas' agreement with the Utility Workers Union of America is effective through November 21, 2019. The agreements also make the terms of the Southern Company Gas pension plan subject to collective bargaining with the unions when significant changes to the benefit accruals are considered by Southern Company Gas.
Effective in December 2017, 538 employees transferred from SCS to Southern Power. Southern Power became obligated for related employee costs including pension, other postretirement benefits, and stock-based compensation and has recognized the respective balance sheet assets and liabilities, including accumulated other comprehensive income impacts, in its balance sheet at December 31, 2017. Prior to the transfer of employees, Southern Power's agreements with SCS provided for employee services rendered at amounts in compliance with FERC regulations.


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Item 1A. RISK FACTORS
In addition to the other information in this Form 10-K, includingMANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL in Item 7, ofeach registrant, and other documents filed by Southern Company and/or itssubsidiaries with the SEC, from time to time, the following factors should becarefully considered in evaluating Southern Company and its subsidiaries. Suchfactors could affect actual results and cause results to differ materially fromthose expressed in any forward-looking statements made by, or on behalf of, SouthernCompany and/or its subsidiaries. The risk factors discussed below could adversely affect a Registrant's results of operations, financial condition, liquidity, and cash flow, as well as cause reputational damage.
UTILITY REGULATORY, LEGISLATIVE, AND LITIGATION RISKS
Southern Company and its subsidiaries are subject to substantial federal, state, and federallocal governmentalregulation.regulation, including with respect to rates. Compliance with current and future regulatory requirements andprocurement of necessary approvals, permits, and certificates may result insubstantial costs to Southern Company and its subsidiaries.
Laws and regulations govern the terms and conditions of the services the Southern Company system offers, protection of critical electric infrastructure assets, transmission planning, reliability, pipeline safety, interaction with wholesale markets and its subsidiaries, includingretail customers, and relationships with affiliates, among other matters. The Registrants' businesses are subject to regulatory regimes which could result in substantial monetary penalties if a Registrant is found to be noncompliant.
The profitability of the traditional electric operating companies, Southern Power,companies' and Southern Company Gas,the natural gas distribution utilities' businesses is largely dependent on their ability, through the rates that they are subjectpermitted to substantial regulation from federal, state,charge, to recover their costs and local regulatory agencies. Southern Company and its subsidiaries are required to comply with numerous laws and regulations and to obtain numerous permits, approvals, and certificates from the governmental agencies that regulate various aspectsearn a reasonable rate of their businesses. Jointly-owned facilities may be subject to regulation by governmental agencies of more than one state and those state's governmental agencies may have different policies with respect to such jointly-owned facilities.return on invested capital. The traditional electric operating companies and the natural gas distribution utilities seek to recover their costs, (includingincluding a reasonable return on invested capital)capital, through their retail rates, which must be approved by the applicable state PSC or other applicable state regulatory agency. A state PSC or other applicable state regulatory agency,Such regulators, in a future rate proceeding, may alter the timing or amount of certain costs for which recovery is allowed or modify the current authorized rate of return. Ratereturn; rate refunds may also be required. The outcome of any such proceeding could be impacted by a variety of factors, including the level of opposition from intervenors, potential impacts to customers, and past or future changes in the political, regulatory, economic, or legislative environment. Additionally, the rates charged to wholesale customers by the traditional electric operating companies and by Southern Power and the rates charged to natural gas transportation customers by Southern Company Gas' pipeline investments must be approved by the FERC. These wholesale rates could be affected by changesChanges to Southern Power's and the traditional electric operating companies' ability to conduct business pursuant to FERC market-based rate authority. authority could affect wholesale rates. Also, while a small percentage of transmission costs are recovered through wholesale electric tariffs, the majority are recovered through retail rates. Transmission planning and the resulting grid improvements could be impacted by FERC policy changes as well as North American Electric Reliability Corporation planning standard changes.
The FERC rules relatedIRA, among other items, imposes a 15% corporate minimum tax on book income and is subject to retaining the authority to sell electricity at market-based rates inissuance of additional guidance by the wholesale markets are important forU.S. Treasury Department and the IRS. Any rate recovery by the traditional electric operating companies and Southern Power if they areor the natural gas distribution utilities will be determined pursuant to remain competitive in the wholesale markets in which they operate.regulatory processes of the FERC, state PSCs, or other applicable state regulatory agencies. There is no assurance, however, that such tax expense will be recoverable through the applicable regulatory process.
The impact of any future revision or changes in interpretations of existing regulations or the adoption of new laws and regulations applicable to Southern Company or any of its subsidiaries is uncertain. Changes in regulation, or the imposition of additional regulations, changes in application of existing regulations and in enforcement practices of regulators, or penalties imposed for noncompliance with existing laws or regulations could influence the operating environment of the Southern Company and its subsidiariessystem and may result in substantial costs or otherwise negatively affect their results of operations.costs.
The Southern Company system's costs of compliance with environmental laws and satisfying related AROs are significant. The costs of compliance with current and future environmental laws and the incurrence of environmental liabilities could negatively impact the net income, cash flows, and financial condition of the registrants.
The Southern Company system's operations are subject to extensive regulationregulated by state and federal environmental agencies through a variety of laws and regulations governing air, GHGs, water, land, avian and theother wildlife and habitat protection, ofand other natural resources. Compliance with these existing environmental requirements involves significant capital and operating costs including the settlement of AROs, a major portion of which is expected to be recovered through existing ratemaking provisions or through market-based contracts.retail and wholesale rates. There is no assurance, however, that all such costs will be recovered. The registrantsRegistrants expect that thesefuture compliance expenditures will continue to be significant in the future.significant.
The EPA has adopted and is implementing regulations governing air and water quality, including the emission of nitrogen oxide, sulfur dioxide, fine particulate matter, ozone, mercury, and other air pollutantsGHG emissions under the Clean Air Act and regulations governing cooling water intake structures and effluent guidelines for steam electric generating plantsquality under the Clean Water Act. The EPA and certain states have also is reconsideringadopted and continue to propose regulations governing the disposal and management of CCR including coal ash and gypsum, in landfills and surface impoundments at power generation plants.plant sites under the Resource Conservation and Recovery Act and applicable state laws. The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions
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related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential compliance methods. The traditional electric operating companies will continue to periodically update their ARO cost estimates and those updates could be material.
Additionally, environmental laws and regulations covering the handling and disposal of waste and release of hazardous substances could require the Southern Company system to incur substantial costs to clean up affected sites, including certain current and former operating sites, and locations affected by historical operations or subject to contractual obligations.
Existing environmental laws and regulations may be revised or new laws and regulations related to air, water, land, and the protection of other natural resources may be adopted or become applicable to the traditional electric operating companies, Southern Power, and/or Southern Company Gas.

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Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S.United States. This litigation has included, but is not limited to, claims for damages alleged to have been caused by CO2 and other emissions, CCR, releases of regulated substances, and alleged exposure to regulated substances, and/or requests for injunctive relief in connection with such matters.
Compliance with any new or revised environmental laws or regulations could affect many areas of operations for the Southern Company system. The Southern Company system's ultimate environmental compliance strategy including potential electric generating unit retirement and replacement decisions, and future environmental capital expenditures will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, fuel prices, and the outcome of pending and/or future legal challenges. Compliance costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, and addingoperational changes, or changing fuel sources for certain existing units, as well as related upgrades to the Southern Company system's transmission system.and distribution (electric and natural gas) systems. Environmental compliance spending over the next several years may differ materially from the amounts estimated. Such expendituresestimated and could adversely affect results of operations, cash flows, and financial conditionthe Registrants if such costs are notcannot continue to be recovered on a timely basis through regulated rates for the traditional electric operating companies and the natural gas distribution utilities or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.basis. Further, higherincreased costs that are recovered through regulated rates could contribute to reduced demand for energy, which could negatively affect results of operations, cash flows,electricity and financial condition.natural gas. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affectreduce their demand for electricity or natural gas.
Compliance with any new or revised environmental laws or regulations could affect many areas of the traditional electric operating companies', Southern Power's, and the natural gas distribution utilities' operations. The ultimate impact will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, and the outcome of pending and/or future legal challenges. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which may affect their demand for electricity and natural gas.
The Southern Company system may be exposed to regulatory and financial risks related to the impact of greenhouse gas (GHG)GHG legislation, regulation, and regulation.emission reduction goals.
In 2015, the EPA published final rules limiting CO2 emissions from new, modified,Concern and reconstructed fossil fuel-fired electric generating unitsactivism about climate change continue to increase and, guidelinesas a result, demand for statesenergy conservation and sustainable assets could further increase. Additionally, costs associated with GHG legislation, regulation, and emission reduction goals could be significant and there is no assurance such costs would be fully recovered through regulated rates or PPAs.
The Southern Company system has processes for identifying, assessing, and responding to develop plansclimate-related risks, including a scenario planning process that is used to meet EPA-mandated CO2 emission performance standards for existing units (known as the Clean Power Plan or CPP). In February 2016, the U.S. Supreme Court granted a stay of the CPP, which will remain in effect through the resolution of the litigationinform resource planning decisions in the U.S. Court of Appeals forstates in which the District of Columbia challenging the legality of the CPPtraditional electric operating companies operate. This process relies on information and any review by the U.S. Supreme Court. On March 28, 2017, the U.S. President signed an executive order directing agencies to review actions that potentially burden the developmentassumptions from internal and external sources, which may or use of domestically produced energy resources,may not be accurate in predicting future outcomes.
Additional GHG policies, including review of the CPP and other CO2 emissions rules. On October 10, 2017, the EPA published a proposed rule to repeal the CPP and, on December 28, 2017, published an advanced notice of proposed rulemaking regarding a CPP replacement rule.
In 2015, parties to the United Nations Framework Convention on Climate Change, includinglegislation, may emerge requiring the United States adopted the Paris Agreement, which establishedto accelerate its transition to a non-binding universal framework for addressinglower GHG emissions based on nationally determined contributions. On June 1, 2017, the U.S. President announced that the United States would withdraw from the Paris Agreement and begin renegotiating its terms.emitting economy. The ultimate impact of this agreement or any renegotiated agreement depends on its implementation by participating countries.
Costs associated with these actions could be significant to the utility industry and the Southern Company system. However, the ultimate impact of these environmental laws and regulations will depend on various factors, such as state adoption and implementation of requirements, natural gas prices, the availabilitydevelopment, deployment, and costadvancement of any deployed control technology,relevant energy technologies, the ability to recover costs through existing ratemaking provisions, and the outcome of pending and/or future legal challenges.
The SEC has proposed new rules relating to the disclosure of climate-related matters. If the proposed rules, or similar rules, are enacted, the Registrants could incur increased costs to comply with these new rules and could face increased risk of litigation related to disclosures made pursuant to the rules.
Because natural gas is a fossil fuel with lower carbon content relative to other fossil fuels, future GHGcarbon constraints, including, but not limited to, the imposition of a carbon tax, may create additional demand for natural gas, both for production of electricity and direct use in homes and businesses. The impact is already being seen inHowever, such demand may be tempered by legislation limiting the power production sector due to both environmental regulations and lowuse of natural gas costs. Futurein certain circumstances, including use in new construction and certain household appliances. Additionally, efforts to electrify the transportation, building, and other sectors may result in higher electric demand and negatively impact natural gas demand. For example, Nicor Gas' regulator, the Illinois Commission, has ordered a "future of natural gas" proceeding to explore the recommendations involved with decarbonization of the gas distribution system in Illinois. In addition, future GHG constraints, focused on minimizingincluding those related to methane emissions, designed to minimize emissions from natural gas albeit lower than other fossil fuels, could likewise result in increased costs to the Southern Company system and affect the demand for natural gas as well as the prices charged to customers and the competitive position of natural gas.

Southern Company has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. The strategy to achieve these goals also relies on continuing to pursue a diverse portfolio including
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The net income of Southern Company, the traditional electric operating companies,low-carbon and Southern Power could be negatively impacted by changes in regulations relatedcarbon-free resources and energy efficiency resources; customer demand for carbon-free energy; continuing to transmission planning processes and competition in the wholesale electric markets.
The traditional electric operating companies currently own and operate transmission facilities as part of a vertically integrated utility. A small percentage of transmission revenues are collected through the wholesale electric tariff but the majority of transmission revenues are collected through retail rates. FERC rules pertaining to regional transmission planning and cost allocation present challenges to transmission planning and the wholesale market structure in the Southeast. The key impacts of these rules include:
possible disruption of the integrated resource planning processes within the states intransition the Southern Company system's service territory;
delaysgenerating fleet and additional processes for developingmaking the necessary related investments in transmission plans; and
possible impacts distribution systems; continuing research and development with a particular focus on state jurisdictiontechnologies that lower GHG emissions, including methods of approving, certifying,removing carbon from the atmosphere; and pricing new transmission facilities.
The FERC rules related to transmission are intended to spur the development of new transmission infrastructure to promote and encourage the integration of renewable sources of supply as well as facilitate competition in the wholesale market by providing more choices to wholesale power customers. Technology changes in the power and fuel industries continue to create significant impacts to wholesale transaction cost structures. The impact of theseconstructively engaging with policymakers, regulators, investors, customers, and other such developments andstakeholders to support outcomes leading to a net zero future. There can be no guarantee that the effect of changes in levels of wholesale supply and demand are uncertain. The financial condition, net income, and cash flows of Southern Company the traditional electric operating companies,system will achieve these goals.
See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Southern Power could be adversely affected by these and other changes.
The traditional electric operating companies and Southern Power could be subject to higher costs as a result of implementing and maintaining compliance with the North American Electric Reliability Corporation mandatory reliability standards along with possible associated penalties for non-compliance.
Owners and operators of bulk power systems, including the traditional electric operating companies, are subject to mandatory reliability standards enacted by the North American Electric Reliability Corporation and enforced by the FERC. Compliance with or changes in the mandatory reliability standards may subject the traditional electric operating companies and Southern Power to higher operating costs and/or increased capital expenditures. If any traditional electric operating company or Southern Power is found to be in noncompliance with these standards, such traditional electric operating company or Southern Power could be subject to sanctions, including substantial monetary penalties.
Southern Company and its subsidiaries are continuing to review the Tax Reform Legislation, which has and could have a further material impact on the results of operations, financial condition, and cash flows of the registrants.
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation significantly changes the U.S. Internal Revenue Code by, among other things, reducing the federal corporate income tax rate to 21% and repealing the corporate alternative minimum tax. As a result of the tax rate reduction, Southern Company recorded net, non-cash federal income tax benefits of $264 million in the fourth quarter 2017, comprised primarily of a $743 million tax benefit resulting from reductions in deferred tax liabilities at Southern Power, partially offset by tax expenses of $372 million and $93 million resulting from reductions in deferred tax assets at Mississippi Power and Southern Company Gas, respectively.
The tax rate reduction also resulted in a $6.9 billion increase in regulatory liabilities and a $0.4 billion decrease in regulatory assets across the traditional electric operating companies and the natural gas distribution utilities. The regulatory treatment of certain impacts of the Tax Reform Legislation is subject to the discretion of the FERC and the relevant state regulatory bodies.
For businesses other than regulated utility businesses, the Tax Reform Legislation allows 100% bonus depreciation of qualified property through 2022, which phases down through 2027, and limits interest expense deductions. Regulated utility businesses, including the majority of the operations of the traditional electric operating companies and the natural gas distribution companies, can continue deducting all business interest expense and are not eligible for bonus depreciation on capital assets acquired and placed in service after September 27, 2017. The Tax Reform Legislation retains normalization provisions for public utility property and existing renewable energy incentives. However, the tax rate reduction delays the utilization of renewable tax credit carryforwards as described in Note 5 to the financial statements of Southern Company, Alabama Power, Georgia Power, and Southern Power under "Federal Tax Reform Legislation"Regulations– Greenhouse Gases" in Item 8 herein.
The Tax Reform Legislation also includes provisions that limit the utilization of future net operating losses and limit the deductibility of certain executive compensation and other expenses. Further, while it is unclear how the credit rating agencies, the FERC, and relevant state regulatory bodies may respond to the Tax Reform Legislation, certain financial metrics, such as funds from operations to debt percentage, used by the credit rating agencies to assess the registrants, Southern Company Gas Capital, and Nicor Gas may be negatively impacted.

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The Tax Reform Legislation is unclear in certain respects and will require interpretations, guidance, and implementing regulations by the IRS, as well as each respective state's adoption. In addition, the regulatory treatment of certain impacts of the Tax Reform Legislation is subject to the discretion of the FERC and relevant state regulatory bodies. Southern Company and its subsidiaries are continuing to review the Tax Reform Legislation and are assessing whether any potential actions are available to mitigate adverse impacts of the legislation. Southern Company and its subsidiaries may identify7 herein for additional impacts as they further assess the Tax Reform Legislation and as the IRS issues interpretations and implements regulations. Southern Company will continue to monitor the actions of state legislatures and state taxing authorities to see how the states may adopt and implement the Tax Reform Legislation. While the ultimate impact of the Tax Reform Legislation, future interpretations and implementation of regulations by the IRS and state tax authorities, and any mitigating actions Southern Company and its subsidiaries may take cannot be determined at this time, the Tax Reform Legislation had and could have a further material impact on the results of operations, financial condition and cash flows of the registrants.information.
OPERATIONAL RISKS
The financial performance of Southern Company and its subsidiaries may be adverselyaffected if the subsidiaries are unable to successfully operate their facilities or perform certain corporate functions.
The financial performance of Southern Company and its subsidiaries depends on the successful operation of the electric utilities' generating,generation, transmission, and distribution facilities, and Southern Company Gas' natural gas distribution facilities, and distributed generation storage facilitiestechnologies and the successful performance of necessary corporate functions. There are many risks that could affect these operations and performance of corporate functions, including:
matters, including operator error or failure of equipment or processes;
processes, accidents, or explosions;
operating limitations that may be imposed by environmental or other regulatory requirements;
requirements or in connection with joint owner arrangements, labor disputes;
terroristdisputes, physical attacks, (physical and/or cyber);
fuel or material supply interruptions;
interruptions and/or shortages, transmission disruption or capacity constraints, including with respect to the Southern Company system's and third parties' transmission, storage, and transportation facilities;
facilities, inability to maintain reliability consistent with customer expectations as the traditional electric operating companies and Southern Power transition their generating fleets in support of the Southern Company system's net zero goal, compliance with mandatory reliability standards, including mandatory cyber security standards;
standards, implementation of new technologies;
informationtechnologies, technology system failure;
failures, cyber intrusion;
anintrusions, environmental event,events, such as a spillspills or release;releases, supply chain disruptions, inflation, and
catastrophic events such as fires, earthquakes, explosions, floods, droughts,tornadoes, hurricanes tornadoes, and other storms, droughts, pandemic health events, such as influenzas,wars, political unrest, or other similar occurrences.
A decrease or elimination of revenues from the electric generation, transmission, or distribution facilities or natural gas distribution or storage facilities or an increase in the cost of operating the facilities would reduce the net income and cash flows and could adversely impact the financial condition of the affected traditional electric operating company, Southern Power, or Southern Company Gas and of Southern Company.
Operation of nuclear facilities involves inherent risks, including environmental,safety, health, regulatory, natural disasters, terrorism,cyber intrusions, physical attacks, and financial risks, that could result in fines or theclosure of the nuclear units owned by Alabama Power or Georgia Powerand which may present potential exposures in excess of insurance coverage.
Alabama Power owns, and contracts for the operation of, two nuclear units and Georgia Power holds undivided interests in, and contracts for the operation of, fourfive existing nuclear units. The sixseven existing units are operated by Southern Nuclear and representrepresented approximately 3,680 MWs, or 8% of the Southern Company system's electric generation capacity as of December 31, 2017. In addition, these units generated approximately 25%27% and 29% of the total KWHs generated by each of Alabama Power and Georgia Power, respectively, in the year ended December 31, 2017.2023. In addition, Southern Nuclear, on behalf of Georgia Power and the other Vogtle Owners, is managing the construction and start-up of Plant Vogtle Units 3 andUnit 4. Due solely to the increase in nuclear generating capacity, the below risks are expected to increase incrementally once Plant Vogtle Units 3 and 4 are operational. Nuclear facilities are subject to environmental, safety, health, operational, and financial risks such as:
the potential harmful effects on the environment and human health and safety resulting from a release of radioactive materials in connection with the operation of nuclear facilities and the storage, handling, and disposal of radioactive material, including spent nuclear fuel;
materials; uncertainties with respect to the ability to dispose of spent nuclear fuel and the need for longer term on-site storage;
uncertainties with respect to the technological and financial aspects of decommissioning nuclear plants at the end of licensed lives and the ability to maintain and anticipate adequate capital reserves for decommissioning;

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limitations on the amounts and types of insurance commercially available to cover losses that might arise in connection with the nuclear operations of Alabama Poweroperations; and Georgia Power or those of other commercial nuclear facility owners in the U.S.;
potential liabilities arising out of the operation of these facilities;
significant capital expenditures relating to maintenance, operation, security, and repair of these facilities, including repairs and upgrades required by the NRC;facilities.
the threat of a possible terrorist attack, including a potential cyber security attack; and
the potential impact of an accident or natural disaster.
It is possible that damages,Damages, decommissioning, or other costs could exceed the amount of decommissioning trusts or external insurance coverage, including statutorily required nuclear incident insurance.
The NRC has broad authority under federal law to impose licensing and safety-related requirements for the operation of nuclear generation facilities. In the event of non-compliance, the NRC has the authority to impose fines and/or shut down any unit, depending upon its assessment of the severity of the situation, until compliance is achieved. NRC orders or regulations related to increased security measures and any future NRC safety requirements promulgated by the NRC could require Alabama Power and Georgia Power to make substantial operating and capital expenditures at their nuclear plants. In addition, if a seriousmajor nuclear incident were to occur, it could result in substantial costs to Alabama Power or Georgia Power and Southern Company. A major incident at a nuclear facility anywhere in the world could cause the NRC to delay or prohibit construction of new nuclear units or require additional safety measures at new and existing units.measures. Moreover, a major incident at any nuclear facility in the U.S.,United States, including facilities owned and operated by third parties, could require Alabama Power and Georgia Power to make material contributory payments.
In addition, actual or potential terrorist threats of cyber intrusions or physical attacks could result in increased nuclear licensing or compliance costs that are difficultcosts.
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TransportingGeneration, transmission, and storingdistribution of electricity and transportation and storage of natural gas involvesinvolve risks that may result in accidents and other operating risks and costs.
The Southern Company Gas'system's electric generation, transmission, and distribution and natural gas distribution and storage activities involve a variety of inherent hazards and operating risks, such as leaks, accidents, explosions, andfires, mechanical problems, whichdischarges or releases of toxic or hazardous substances or gases, and other environmental risks. These incidents could result in serious injury, to employees and non-employees, loss of human life, significant damage to property, environmental pollution, and impairmentdisruption of itsthe Southern Company system's operations. The location of electric generation, transmission, and distribution infrastructure and natural gas pipelines and underground natural gas storage facilities near populated areas could increase the level of damage and liability resulting from these risks.any incidents. Additionally, these pipelineelectric generation, transmission, and distribution infrastructure and natural gas pipelines and underground natural gas storage facilities are subject to various state and other regulatory requirements. Failure to comply with these regulatory requirements could result in substantial monetary penalties or potential early retirement of storage facilities, which could trigger an associated impairment. The occurrence of any of these events not fully covered by insurance or otherwise could adversely affect Southern Company Gas' and Southern Company's financial condition and results of operations.penalties.
Physical attacks, both threatened and actual, could impact the ability of the traditional electric operating companies, Southern Power, and Southern Company GasSubsidiary Registrants to operate and could adversely affect financial results and liquidity.operate.
The traditional electric operating companies, Southern Power, and Southern Company GasSubsidiary Registrants face the risk of physical attacks, both threatened and actual, against their respective generation and storage facilities and the transmission and distribution infrastructure used to transport energy, which could negatively impact their ability to generate, transport, and deliver power, or otherwise operate their respective facilities, or, with respect to Southern Company Gas, its ability to distribute or store natural gas, or otherwise operate its facilities, in the most efficient manner or at all. Transmission and distribution infrastructure can be vulnerable to physical attack because it is often unmanned, widely dispersed, and located in isolated areas. The risk of physical attack may escalate during periods of heightened geopolitical tensions. In addition, physical attacks against key suppliers or servicethird-party providers could have a similar effect on the Southern Company and its subsidiaries.system.
Despite the implementation of robust security measures, all assets are potentially vulnerable to disability, failures, or unauthorized access due to human error, natural disasters, technological failure, or internal or external physical attacks. If assets were to fail, be physically damaged, or be breached and were not recoveredrestored in a timely way,manner, the traditional electric operating companies, Southern Power, or Southern Company Gas, as applicable,affected Subsidiary Registrant may be unable to fulfill critical business functions. Moreover, the amount and scope of insurance maintained against losses resulting from any such events or physical security breachesInsurance may not be sufficientadequate to cover losses or otherwise adequately compensate for any disruptions to business that could result.
These events could harm the reputation of and negatively affect the financial results of the registrants through lost revenues and costs to repair damage, if such costs cannot be recovered.associated losses.
An information security incident, including a cybersecurity breach, or the failure of, or inability to remotely access, one or more key information technology systems, networks, or processes could impact the ability of the registrantsRegistrants to operate and could adversely affect financial results and liquidity.operate.
Information security risks have generally increased in recent years as a result of the proliferation of new technology and increased sophistication and frequency of cyber attacks and data security breaches. The traditional electric operating

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companies, Southern Power, and Southern Company GasSubsidiary Registrants operate in highly regulated industries that require the continued operation of sophisticated information technology systems and network infrastructure, which are part of interconnected distribution systems. Because of the critical nature of the infrastructure increased connectivity toand the internet, and technology systems' inherent vulnerability to disability or failures due to hacking, viruses, denial of service, ransomware, acts of war or terrorism, or other types of data security breaches, Southern Company and its subsidiariesthe Registrants face a heightened risk of cyberattack. Parties that wishRemote working arrangements also increase the Registrants' data security risks. Additionally, the Registrants' field workforces use mobile technology, which have fewer security measures than the Registrants' wired networks. Portions of the Registrants' system data, architecture, and other materials may also be disclosed, either intentionally or unintentionally, to disruptthird parties and the U.S. bulk powerpublic by regulators, employees, contractors, and vendors. This system or Southern Company system operations could view these computerinformation may be used by malicious actors to understand the Registrants' systems to prepare for a cyberattack. In addition, unpatched software or networksnetwork vulnerabilities, including those resulting from the use of end-of-life operating systems, could be leveraged by an attacker.
Cyber actors, including those associated with foreign governments, have attacked and threatened to attack energy infrastructure. Various regulators have increasingly stressed that these attacks, including ransomware attacks, and attacks targeting utility systems and other critical infrastructure, are increasing in sophistication, magnitude, and frequency. In particular, certain actors, such as targets. nation-state and state-sponsored actors, can deploy significant resources and employ sophisticated methods to plan and carry out attacks. Risk of these attacks may escalate during periods of heightened geopolitical tensions, such as those caused by the war in Ukraine and conflicts in the Middle East.
The registrantsRegistrants and their third-party vendors have been subject, and will likely continue to be subject, to attempts to gain unauthorized access to their information technology systems and confidential data or to attempts to disrupt utility and related business operations. As a result,While there have been immaterial incidents of phishing, unauthorized access to technology systems, financial fraud, and disruption of remote access across the Southern Company and its subsidiaries face on-going threats to their assets, including assets deemed critical infrastructure, where databases and systems have been, and will likely continue to be, subject to advanced computer viruses or other malicious codes, unauthorized access attempts, phishing, and other cyber attacks. Whilesystem, there has been no material impact on business or operations from these attacks,attacks. However, the registrantsRegistrants cannot guarantee that security efforts will have the maturity to detect or prevent breaches, operational incidents, or other breakdowns of information technology systems and network infrastructure. This is especially true in the event the Registrants are targeted by a sophisticated attacker with significant resources, such as a nation-state or state-sponsored actor. Further, the Registrants do not have security visibility into all operational technology communications and processes, do not maintain completely exhaustive inventories of assets and applications, and do not centrally manage or monitor all technologies, applications, and environments, which could negatively affect preparation for, investigation of, or response to an information security incident. Accordingly, the Registrants cannot provide any assurance that information security incidents will not have a material adverse effect in the future.
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In addition, in the ordinary course of business, Southern Company and its subsidiaries collect and retain sensitive information, including personally identifiable information about customers, employees, and stockholders, and other confidential information. In some cases, administration of certain functions may be outsourced to third partythird-party service providers. Malicious actors may target these providers that could also be targets of cyber attacks. Generally, Southern Company and its subsidiaries enter certain contractual security guarantees and assurances with theseto disrupt the services they provide to the Registrants, or to use those third parties to help ensureattack the Registrants. The Registrants do not fully assess the security maturity of all third-party service providers and safety of this information.
Despite the implementation of robustsuch third-party service providers could fail to establish adequate risk management and information security measures all assets are potentially vulnerablewith respect to disability, failures, their systems and/or unauthorized accesscould fail to timely notify the Registrants of an information security incident.
Internal or external cyberattacks may have wide-reaching impacts due to human error, natural disasters, technological failure, incomplete segmentation among network assets and/or internal or external cyber attacks. If assets were to fail or be breached and were not recovered inreliance of segmented networks on a timely way,disrupted network, inhibit the affected registrant may be unableRegistrant's ability to fulfill critical business functions, andincluding energy delivery service failures, compromise sensitive and other data, could be compromised.violate privacy laws, and lead to customer dissatisfaction. Any cyber breach or theft, damage, or improper disclosure of sensitive electronic data may also subject the affected registrantRegistrant to penalties and claims from regulators or other third parties. Moreover, the amount and scope of insurance maintained against losses resulting from any such events or security breachesInsurance may not be sufficientadequate to cover losses or otherwise adequately compensate for any disruptionsassociated losses. Additionally, the cost and operational consequences of implementing, maintaining, and enhancing system protection measures are significant, and they could materially increase to business that could result.address ever changing intense, complex, and sophisticated cyber risks.
These events could negatively affect the financial results of the registrants through lost revenues, costs to recover and repair damage, and costs associated with governmental actions in response to such attacks, litigation, and reputational damage if such costs cannot be recovered through insurance or otherwise.
The Southern Company system may not be able to obtainadequate natural gas, fuel supplies, and other fuel suppliesresources required to operate the traditional electric operating companies' and Southern Power's electric generating plants or serve Southern Company Gas' natural gas customers.
TheSCS, on behalf of the traditional electric operating companies and Southern Power, purchasepurchases fuel including coal,for the Southern Company system's generation fleet from a diverse set of suppliers. Southern Company Gas' primary business is the distribution of natural gas uranium, fuel oil,through the natural gas distribution utilities. Natural gas is delivered daily from different regions of the country. This daily supply is complemented by natural gas supplies stored in both company-owned and biomass, as applicable, from a number of suppliers.third party storage locations. To deliver this daily supply and stored natural gas, the Southern Company system has firm transportation capacity contracted with third party interstate pipelines. Disruption in the supply and/or delivery of fuel including disruptions as a result of among other things,matters such as transportation delays, weather, labor relations, natural disasters, cyber or physical attacks, other force majeure events, or environmental regulations affecting any of these fuel suppliers could limit the ability of the traditional electric operating companies and Southern Power to operate certain facilities, which could result in higher fuel and operating costs, and potentially reduce the net incomeability of the affected traditional electric operating company or Southern Power and Southern Company.
Southern Company Gas' primary business is the distribution and sale of natural gas through its regulated and unregulated subsidiaries. Natural gas supplies can be subject to disruption in the event production or distribution is curtailed, such as in the event of a hurricane or a pipeline failure. Southern Company Gas also relies onto serve its natural gas pipelines and other storage and transportation facilities owned and operated by third parties to deliver natural gas to wholesale markets and to Southern Company Gas' distribution systems. The availability of shale gas and potential regulations affecting its accessibility may have a material impact on the supply and cost of natural gas. Disruption in natural gas supplies could limit the ability to fulfill these contractual obligations.
The traditional electric operating companies and Southern Power have become more dependent on natural gas for a portion of their electric generating capacity. In many instances, the cost of purchased power for the traditional electric operating companies and Southern Power is influenced by natural gas prices. Historically, natural gas prices have been more volatile than prices of other fuels. In recent years, domestic natural gas prices have been depressed by robust supplies, including production from shale gas. These market conditions, together with additional regulation of coal-fired generating units, have increased the traditional electric operating companies' reliance on natural gas-fired generating units.customers.
The traditional electric operating companies are also dependent on coal, and related coal supply contracts, for a portion of their electric generating capacity. The traditional electric operating companies depend oncounterparties to coal supply contracts and the counterparties to these agreements may not fulfill their obligations to supply coal to the traditional electric operating companies. The suppliers may experiencebecause of financial or

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technical problems that inhibit their ability to fulfill their obligations.problems. In addition, the suppliers and/or railroads may be delayed in supplying or delivering or may not be required to supply or deliver coal under certain circumstances, such as in the event of a natural disaster. If the traditional electric operating companies are unable to obtain their contracted coal requirements, under these contracts, they may be required to purchase theiradditional coal requirements at higher prices whichor limit coal generation, and these increased costs may not be recoverable through rates.rates if deemed to be imprudently incurred. Coal deliveries continued to be delayed early in 2023, which has largely been attributed to labor shortages in the railroad industry. Service levels improved over the course of 2023 and deliveries returned to normal levels by the end of 2023. As coal-fired generating facilities are retired, the demand for coal is expected to continue to decline. As a result, railroads may commit fewer resources to coal transportation, which could increase these risks.
Whereas fuel oil directly provides only a small portion of the Southern Company system's annual generation, its importance to the reliability of the Southern Company system's generation portfolio continues to grow. Over the last few years, related cost increases and supply chain challenges have become more common and may increase the risk of reliability challenges.
In addition to fuel supply, the traditional electric operating companies and Southern Power also need adequate access to water, which is drawn from nearby sources, to aid in the production of electricity. Any impact to their water resources could also limit the ability of the traditional electric operating companies and Southern Power to operate certain facilities, which could result in higher fuel and operating costs.
The revenues of Southern Company, the traditional electric operating companies, and SouthernPower depend inpart on sales under PPAs. The failurePPAs, the success of a counterparty to one of these PPAs toperform itswhich depend on PPA counterparties performing their obligations, the failure of the traditional electric operating companies or Southern Power to satisfyCompany subsidiaries satisfying minimum requirements under the PPAs, and renewal or the failure to renewreplacement of the PPAs or successfully remarketfor the related generating capacity could have a negativeimpact on the net income and cash flows of the affected traditional electric operating companyor Southern Power and of Southern Company.capacity.
Most of Southern Power's generating capacity has been sold to purchasers under PPAs.PPAs with Southern Power's top three customers Georgia Power, Duke Energy Corporation, and Morgan Stanley Capital Group accounted for 11.3%, 6.7%, and 4.5%, respectively,comprising approximately 19% of Southern Power's total revenues for the year ended December 31, 2017. In addition, the2023. The traditional electric operating companies enterhave entered into PPAs with non-affiliated parties. Revenuesparties for the sale of generating capacity.
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The revenues related to PPAs are dependent on the continued performance by the purchasers of their obligations under these PPAs. The failure of one of the purchasers to perform its obligations could have a negative impact on the net income and cash flows of the affected traditional electric operating company or Southern Power and of Southern Company.obligations. Although the credit evaluations undertaken and contractual protections implemented by Southern Power and the traditional electric operating companies take into account the possibility of default by a purchaser, actual exposure to a default by a purchaser may be greater than predicted or specified in the applicable contract.
Additionally, neither Southern Power nor any traditional electric operating company can predict whether the PPAs will be renewed at the end of their respective terms or on what terms any renewals may be made. If a Registrant is unable to replace expiring PPAs with an acceptable new revenue contract, it may be required to sell the power produced by the facility at wholesale prices and be exposed to market fluctuations and risks, or the affected site may temporarily or permanently cease operations. The failure of the traditional electric operating companies or Southern Power to satisfy minimum operational or availability requirements under these PPAs, including PPAs related to projects under construction, could result in payment of damages or termination of the PPAs.
The asset management arrangements between Southern Company Gas' wholesale gas services and its customers, including the natural gas distribution utilities, may not be renewed or may be renewed at lower levels, which could have a significant impact on Southern Company Gas' financial results.
Southern Company Gas' wholesale gas services currently manages the storage and transportation assets of the natural gas distribution utilities except Nicor Gas. The profits earned from the management of these affiliate assets are shared with the respective affiliate's customers (and for Atlanta Gas Light Company with the Georgia PSC's Universal Service Fund), except for Chattanooga Gas Company and Elkton Gas where wholesale gas services are provided under annual fixed-fee agreements. These asset management agreements are subject to regulatory approval and such agreements may not be renewed or may be renewed with less favorable terms.
Southern Company Gas' wholesale gas services also has asset management agreements with certain non-affiliated customers and its financial results could be significantly impacted if these agreements are not renewed or are amended or renewed with less favorable terms. Sustained low natural gas prices could reduce the demand for these types of asset management arrangements.
Increased competition could negatively impact Southern Company's and its subsidiaries' revenues, results of operations, and financial condition.
The Southern Company system faces increasing competition from other companies that supply energy or generation and storage technologies. Changestechnologies and changes in technology may make thecustomer demand for energy could negatively impact Southern Company system's electric generating facilities owned by theand its subsidiaries.
The traditional electric operating companies operate under a business model that invests capital to serve customers and recovers those investments and earns a return for investors through state regulation. Southern Power less competitive. Southern Company Gas'Power's business model is dependentprimarily focused on natural gas prices remaining competitive as comparedinvesting capital or building energy assets to other forms of energy. Southern Company Gas also faces competition in its unregulated markets.
serve creditworthy counterparties using a bilateral contract model. A key elementpremise of thethese business models of the traditional electric operating companies and Southern Power is that generating power at central station power plants achieves economies of scale and produces power at a competitive cost. There
Customers and stakeholders are increasingly focused on the Registrants' ability to meet rapidly changing demands for new and varied products, services, and offerings. Additionally, the risk of global climate change continues to shape customers' and stakeholders' sustainability goals and energy needs.
New technologies such as distributed generationenergy resources and storage technologies that producemicrogrids and store power, including fuel cells, microturbines, wind turbines, solar cells,increased customer and batteries.stakeholder demand for sustainable assets could change the type of assets constructed and/or the methods for cost recovery. Advances in technologythese technologies or changes in laws or regulations could reduce the cost of thesedistributed generation storage technologies or other alternative methods of producing power to a level that is competitive with that of most central station power electricgeneration production or result in smaller-scale, more fuel efficient, and/or more cost effective distributed generation that allows for increased self-generation by customers. Broader use of distributed generation by retail energy customers may also result from customers' changing perceptions of the merits of utilizing existing generation technology or tax or other economic incentives. Additionally, a state PSC or legislature may modify certain aspects of the traditional electric operating companies' business as a result of these advances in technology.

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generation.
It is also possible that rapid advances in central station power generation technology could reduce the value of the current electric generating facilities owned by the traditional electric operating companies and Southern Power. Changes in technology could also alter the channels through which electric customers buy or utilize power, which could reduce the revenues or increase the expenses of power.
Southern Company the traditional electric operating companies, or Southern Power.
Gas' business is dependent on natural gas prices remaining competitive as compared to other forms of energy. Southern Company Gas' gas marketing services segment also is affected by competition from other energy marketers providing similar services in Southern Company Gas' unregulated service territories, most notably in Illinois and Georgia. Southern Company Gas' wholesale gas services competes for sales with national and regional full-service energy providers, energy merchants and producers, and pipelines based on the ability to aggregate competitively-priced commodities with transportation and storage capacity. Southern Company Gas competes with natural gas facilities in the Gulf Coast region of the U.S., as the majority of the existing and proposed high deliverability salt-dome natural gas storage facilities in North America are located in the Gulf Coast region.
If new technologies become cost competitive and achieve sufficient scale, the market share of the traditional electric operating companies, Southern Power, and Southern Company GasSubsidiary Registrants could be eroded, and the value of their respective electric generating facilities or natural gas distribution and storage facilities could be reduced. Additionally, these technology and customer-induced changes to the Subsidiary Registrants' business models could change the risk profile of the Southern Company system's historical capital investments. Southern Company Gas' market share could be reduced if Southern Company Gas cannot remain price competitive in its unregulated markets. If state PSCs or other applicable state regulatory agencies fail
The Subsidiary Registrants are subject to adjust rates to reflect the impact of any changes in loads, increasing self-generation, and the growth of distributed generation, the financial condition, results of operations, and cash flows ofworkforce factors that could affect operations.
The Southern Company and the affected traditional electric operating company or Southern Company Gas could be materially adversely affected.
Failure tosystem must attract, train, and retain an appropriately qualifieda workforce could negatively impact Southern Company'sto meet current and its subsidiaries' results of operations.
future needs. Events such as an aging workforce without appropriate replacements, increased cost or reduced supply of labor, mismatch of skill sets to future needs, or unavailability of contract resources may lead to operating challenges such as lack of resources, loss of knowledge, and a lengthy time period associated with skill development, including with the workforce needs associated with major construction projects and ongoing operations. The Southern Company system may be subject to continuing workforce trends occurring in the United States triggered by decisions of employees to leave the workforce and/or their employer in higher rates during recent years as compared to prior years and challenges competing with other employers offering more flexible or fully-remote work options. The Southern Company system's costs, including costs for contractors to replace employees, productivity costs, and safety costs, may rise. FailureThe Southern Company system is also subject to risks associated with the failure to adequately manage contract resources. In addition, the failure to hire and adequately obtain replacement employees, including the ability to transfer significant internal historical knowledge and expertise to the new employees, or the future availability and cost of contract labor may adversely affect Southern Company and its subsidiaries' ability to manage and operate their businesses. If
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Supply chain disruptions and inflation could negatively impact operations.
The Southern Company system's operations and its subsidiariesbusiness plans depend on the global supply chain to procure equipment, materials, and other resources. The delivery of components, materials, equipment, and other resources that are unablecritical to successfully attractthe Southern Company system's operations has been impacted by domestic and retain an appropriately qualified workforce, resultsglobal supply chain disruptions. Future pandemic health events or continued international tensions, including the ramifications of regional conflicts, such as those in Ukraine and the Middle East, could further exacerbate global supply chain disruptions. These disruptions and shortages could adversely impact business operations. The constraints in the supply chain also could restrict availability and delay construction, maintenance, or repair of items needed to support normal operations could beor to continue planned capital investments.
Supply chain disruptions have contributed to higher prices of components, materials, equipment, and other needed commodities, and these inflationary increases may continue. Further inflation, a continued elevated interest rate environment, or other economic factors may negatively impacted.affect operations and the timely recovery of costs.
CONSTRUCTION RISKS
The registrantsRegistrants have incurred and may incuradditional costs or delays in the construction of new plants or other facilities and may not be able to recover their investments. Also, existing facilities ofthe traditional electric operating companies, Southern Power, and Southern Company GasSubsidiary Registrants requireongoing capital expenditures, including those to meet AROs and other environmental standards.
Generalstandards and goals.
The businesses of the registrantsRegistrants require substantial capital expenditures for investments in new facilities as well as capital improvements, including transmission, distribution, and generation facilities for the traditional electric operating companies, capital improvements to transmission, distribution, and generation facilities and, for Southern Company Gas,Power, and capital improvements to natural gas distribution and storage facilities includingfor Southern Company Gas. These expenditures also include those to settle AROs and meet environmental standards. Certain of thestandards and goals. The traditional electric operating companies and Southern Power are in the process of constructing new generating facilities andand/or adding environmental controls equipment atand other modifications to certain existing generating facilities.facilities and Southern Company Gas is replacing certain pipelinespipe in its natural gas distribution systemsystem. The traditional electric operating companies also are in the process of closing ash ponds to comply with the CCR Rule and, is involved in two new gas pipeline construction projects.where applicable, state CCR rules. The Southern Company system intends to continue its strategy of developing and constructing other new electric generating facilities, expanding or updating existing facilities, and addingimproving the electric transmission and electric and natural gas distribution systems, and undertaking projects to comply with environmental control equipment.laws and regulations. These types of projects are long termlong-term in nature and in some cases may include the development and construction of facilities with designs that have not been finalized or previously constructed. The completion
Completion of these types of projects without delays or significant cost overruns is subject to substantial risks including:
that have occurred or may occur, including labor costs, availability, and productivity; challenges with the management of contractors or vendors; subcontractor performance; adverse weather conditions; shortages, anddelays, increased costs, or inconsistent quality of equipment, materials, and labor;
changes in labor costs and productivity;
work stoppages;
contractor or supplier delaydelay; the impacts of inflation; delays due to judicial or non-performanceregulatory action; nonperformance under construction, operating, or other agreements or non-performance by other major participants in construction projects;
delays in or failure to receive necessary permits, approvals, tax credits, and other regulatory authorizations;
delays associated with start-up activities, including major equipment failure and system integration, and/or operational performance (including additional costs to satisfy any operational parameters ultimately adopted by any PSC or other applicable state regulatory agency);

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agreements; operational readiness, including specialized operator training and required site safety programs;
impacts of new and existing laws and regulations, including environmental laws and regulations;
the outcome of legal challenges to projects, including legal challenges to regulatory approvals;
failure to construct in accordance with permitting and licensing requirements;
failure to satisfy engineering or design problems or any environmental performance standards and the requirements of tax creditsremediation related thereto; design and other incentives;
licensing-based compliance matters; challenges with start-up activities, including major equipment failure, or system integration; and/or operational performance; challenges related to pandemic health events; continued public and policymaker support for such projects;
adverse weather conditions or natural disasters;
other unforeseen engineering or design problems;
changes in project design or scope;
environmental and geological conditions;
delays or increased costs to interconnect facilities to transmission grids; and
unanticipated cost increases, including materials and labor, and increased financing costs as a result of changes in market interest rates or as a result of construction scheduleproject delays.
If a traditional electric operating company, Southern Power, or Southern Company GasSubsidiary Registrant is unable to complete the development or construction of a project or decides to delay or cancel construction of a project, it may not be able to recover its investment in that project and may incur substantial cancellation payments under equipment purchase orders or construction contracts. Additionally, each Southern Company Gas pipelinecontracts, as well as other costs associated with the closure and/or abandonment of the construction project.
In addition, partnership and joint ownership agreements may provide partners or co-owners with certain decision-making authority in connection with projects under construction, including the right to cause the cancellation of a construction project involves separate joint venture participants, Southern Power participates in partnership agreements with respect to renewable energy projects, and Georgia Power jointly owns Plant Vogtle Units 3 and 4 with other co-owners.under certain circumstances. Any failure by a partner or co-owner to perform its obligations under the applicable agreements could have a material negative impact on the applicable project under construction. In addition,Southern Power participates in partnership agreements with respect to a majority of its renewable energy projects and joint ownership agreementsGeorgia Power jointly owns Plant Vogtle Unit 4 with other co-owners. See Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for additional information regarding other jointly-owned facilities.
If construction projects are not completed according to specification, a Registrant may provide partners or co-ownersincur liabilities and suffer reduced plant efficiency, higher operating costs, and reduced net income. Furthermore, construction delays associated with certain decision-making authorityrenewable projects could result in connection with projects under construction.the loss of otherwise available tax credits and incentives.
Even if a construction project (including a joint venture construction project) is completed, the total costs may be higher than estimated or deemed imprudent and may be disallowed or otherwise not be recoverable through regulated rates, if applicable. In
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addition, construction delays and contractor performance shortfalls can result in the loss of revenues and may, in turn, adversely affect the net income and financial position of the affected registrant.
Construction delays could resultrevenues. The largest construction project currently underway in the loss of otherwise available investment tax credits, PTCs, and other tax incentives. Furthermore, if construction projects are not completed according to specification, a traditional electric operating company, Southern Power, or Southern Company Gas andsystem is Plant Vogtle Unit 4. Southern Company may incur liabilities and suffer reduced plant efficiency, higher operating costs,Georgia Power recorded cumulative pre-tax charges to income of $3.2 billion ($2.4 billion after tax) through December 31, 2023 to reflect Georgia Power's revised estimate to complete construction and reduced net income.start-up of Plant Vogtle Units 3 and 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" in Item 8 herein for information regarding Plant Vogtle Units 3 and 4.
Once facilities become operational, ongoing capital expenditures are required to maintain safe and reliable levels of operation. Significant portions of the traditional electric operating companies' existing facilities were constructed many years ago. Older equipment, even if maintained in accordance with good engineering practices, may require significant capital expenditures to maintain efficiency, to comply with changing environmental requirements, or to provide safe and reliable operations.
The largest construction project currently underway in the Southern Company system is Plant Vogtle Units 3 and 4.
Plant Vogtle Units 3 and 4 construction and rate recovery
In 2009, the Georgia PSC certified construction of Plant Vogtle Units 3 and 4. In 2012, the NRC issued theoperations, and/or to meet related combined construction and operating licenses, which allowed full construction of the two AP1000 nuclear units (with electric generating capacity of approximately 1,100 MWs each) and related facilities to begin. Until March 2017, construction on Plant Vogtle Units 3 and 4 continued under a substantially fixed price engineering, procurement, and construction agreement, pursuant to which the EPC Contractor agreed to design, engineer, procure, construct, and test Plant Vogtle Units 3 and 4. On March 29, 2017, the EPC Contractor filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code.
In connection with the EPC Contractor's bankruptcy filing, Georgia Power, acting for itself and as agent for the Vogtle Owners, entered into an agreement with the EPC Contractor to allow construction to continue (Interim Assessment Agreement). The Interim Assessment Agreement expired on July 27, 2017 upon the effectiveness of a services agreement between the Vogtle Owners and the EPC Contractor for the EPC Contractor to transition construction management of Plant Vogtle Units 3 and 4 to Southern Nuclear and to provide ongoing design, engineering, and procurement services to Southern Nuclear (Vogtle Services Agreement). In August 2017, following completion of comprehensive cost to complete and cancellation cost assessments, Georgia Power filed its seventeenth Vogtle Construction Monitoring (VCM) report with the Georgia PSC, which included a recommendation to continue construction of Plant Vogtle Units 3 and 4, with Southern Nuclear serving as project manager and Bechtel Power Corporation (Bechtel) serving as the primary construction contractor. Facility design and engineering remains the responsibility of the EPC Contractor under the Vogtle Services Agreement. The construction completion agreement between Georgia Power, for itself and as agent for the other Vogtle Owners, and Bechtel (Bechtel Agreement) is a cost reimbursable plus

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fee arrangement, whereby Bechtel will be reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets.
On November 2, 2017, the Vogtle Owners entered into an amendment to their joint ownership agreements for Plant Vogtle Units 3 and 4 (as amended, Vogtle Joint Ownership Agreements) to provide for, among other conditions, additional Vogtle Owner approval requirements. Pursuant to the Vogtle Joint Ownership Agreements, the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 must vote to continue construction if certain adverse events occur, including (i) the bankruptcy of Toshiba Corporation; (ii) termination or rejection in bankruptcy of certain agreements, including the Vogtle Services Agreement or the Bechtel Agreement; (iii) the Georgia PSC or Georgia Power determines that any of Georgia Power's costs relating to the construction of Plant Vogtle Units 3 and 4 will not be recovered in retail rates because such costs are deemed unreasonable or imprudent; or (iv) an increase in the construction budget contained in the seventeenth VCM report of more than $1 billion or extension of the project schedule contained in the seventeenth VCM report of more than one year. In addition, pursuant to the Vogtle Joint Ownership Agreements, the required approval of holders of ownership interests in Plant Vogtle Units 3 and 4 is at least (i) 90% for a change of the primary construction contractor and (ii) 67% for material amendments to the Vogtle Services Agreement or agreements with Southern Nuclear or the primary construction contractor, including the Bechtel Agreement.
On December 21, 2017, the Georgia PSC voted to approve (and issued its related order on January 11, 2018) Georgia Power's recommendation to continue construction and resolved the following regulatory matters related to Plant Vogtle Units 3 and 4: (i) none of the $3.3 billion of costs incurred through December 31, 2015 and reflected in the fourteenth VCM report should be disallowed from rate base on the basis of imprudence; (ii) the December 31, 2015 agreement between Westinghouse and the Vogtle Owners resolving disputes between the Vogtle Owners and the EPC Contractor under the original engineering, procurement, and construction agreement for Plant Vogtle Units 3 and 4 (Contractor Settlement Agreement) was reasonable and prudent and none of the amounts paid pursuant to the Contractor Settlement Agreement should be disallowed from rate base on the basis of imprudence; (iii) (a) capital costs incurred up to $5.680 billion would be presumed to be reasonable and prudent with the burden of proof on any party challenging such costs, (b) Georgia Power would have the burden to show that any capital costs above $5.680 billion were prudent, and (c) a revised capital cost forecast of $7.3 billion (after reflecting the impact of payments received under the Guarantee Settlement Agreement and the Customer Refunds, each as defined below) is found reasonable; (iv) construction of Plant Vogtle Units 3 and 4 should be completed, with Southern Nuclear serving as project manager and Bechtel as primary contractor; (v) approved and deemed reasonable Georgia Power's revised schedule placing Plant Vogtle Units 3 and 4 in service in November 2021 and November 2022, respectively; (vi) confirmed that the revised cost forecast does not represent a cost cap and that prudence decisions on cost recovery will be made at a later date, consistent with applicable Georgia law; (vii) reduced the return on equity (ROE) used to calculate the Nuclear Construction Cost Recovery (NCCR) tariff (a) from 10.95% (the ROE rate setting point authorized by the Georgia PSC in the 2013 Alternative Rate Plan) to 10.00% effective January 1, 2016, (b) from 10.00% to 8.30%, effective January 1, 2020, and (c) from 8.30% to 5.30%, effective January 1, 2021 (provided that the ROE in no case will be less than Georgia Power's average cost of long-term debt); (viii) reduced the ROE used for allowance for funds used during construction equity for Plant Vogtle Units 3 and 4 from 10.00% to Georgia Power's average cost of long-term debt, effective January 1, 2018; and (ix) agreed that upon Unit 3 reaching commercial operation, retail base rates would be adjusted to include carrying costs on those capital costs deemed prudent in the settlement agreement approved by the Georgia PSC on December 20, 2016. The January 11, 2018 order also stated that if Plant Vogtle Units 3 and 4 are not commercially operational by June 1, 2021 and June 1, 2022, respectively, the ROE used to calculate the NCCR tariff will be further reduced by 10 basis points each month (but not lower than Georgia Power's average cost of long-term debt) until the respective unit is commercially operational. In its January 11, 2018 order, the Georgia PSC stated if other certain conditions and assumptions upon which Georgia Power's seventeenth VCM report are based do not materialize, both Georgia Power and the Georgia PSC reserve the right to reconsider the decision to continue construction.
On February 12, 2018, Georgia Interfaith Power & Light, Inc. and Partnership for Southern Equity, Inc. filed a petition appealing the Georgia PSC's January 11, 2018 order with the Fulton County Superior Court. Georgia Power believes the appeal has no merit; however, an adverse outcome in this appeal could have a material impact on Southern Company's and Georgia Power's results of operations, financial condition, and liquidity.
Georgia Power expects Plant Vogtle Units 3 and 4 to be placed in service by November 2021 and November 2022, respectively. Georgia Power's revised capital cost forecast for its 45.7% proportionate share of Plant Vogtle Units 3 and 4 is $8.8 billion ($7.3 billion after reflecting the impact of payments received under a settlement agreement regarding Toshiba's guarantee of certain obligations of the EPC Contractor (Guarantee Settlement Agreement) and certain refunds to customers ordered by the Georgia PSC (Customer Refunds)). Georgia Power's construction work in progress balance for Plant Vogtle Units 3 and 4 was $3.3 billion at December 31, 2017, which is net of the Guarantee Settlement Agreement payments less the Customer Refunds. Georgia Power estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.

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As construction continues, challenges with management of contractors, subcontractors, and vendors, labor productivity and availability, fabrication, delivery, assembly, and installation of plant systems, structures, and components (some of which are based on new technology and have not yet operated in the global nuclear industry at this scale), or other issues could arise and change the projected schedule and estimated cost.
There have been technical and procedural challenges to the construction and licensing of Plant Vogtle Units 3 and 4 at the federal and state level and additional challenges may arise. Processes are in place that are designed to assure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the NRC that occur throughout construction. As a result of such compliance processes, certain license amendment requests have been filed and approved or are pending before the NRC. Various design and other licensing-based compliance matters, including the timely resolution of Inspections, Tests, Analyses, and Acceptance Criteria and the related approvals by the NRC, may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time.
See Note 3 to the financial statements of Southern Company under "Nuclear Construction" and of Georgia Power under "Retail Regulatory Matters - Nuclear Construction" for additional information regarding Plant Vogtle Units 3 and 4.
Southern Company Gas' significant investments in pipelines and pipeline development projects involve financial and execution risks.
Southern Company Gas has made significant investments in existing pipelines and pipeline development projects. Many of the existing pipelines are, and when completed many of the pipeline development projects will be, operated by third parties. If one of these agents fails to perform in a proper manner, the value of the investment could decline and Southern Company Gas could lose part or all of the investment. In addition, from time to time, Southern Company Gas may be required to contribute additional capital to a pipeline joint venture or guarantee the obligations of such joint venture.
With respect to certain pipeline development projects, Southern Company Gas will rely on its joint venture partners for construction management and will not exercise direct control over the process. All of the pipeline development projects are dependent on contractors for the successful and timely completion of the projects. Further, the development of pipeline projects involves numerous regulatory, environmental, construction, safety, political, and legal uncertainties and may require the expenditure of significant amounts of capital. These projects may not be completed on schedule, at the budgeted cost, or at all. There may be cost overruns and construction difficulties that cause Southern Company Gas' capital expenditures to exceed its initial expectations. Moreover, Southern Company Gas' revenues will not increase immediately upon the expenditure of funds on a pipeline project. Pipeline construction occurs over an extended period of time and Southern Company Gas will not receive material increases in revenues until the project is placed in service.
The occurrence of any of the foregoing events could adversely affect the results of operations, cash flows, and financial condition of Southern Company Gas and Southern Company.retirement obligations.
FINANCIAL, ECONOMIC, AND MARKET RISKS
The electric generation and energy marketing operations of the traditional electric operating companies and Southern Power and the natural gas operations of Southern Company Gas are subject to risks, many of which are beyondtheir control, including changes in energy prices and fuel costs, which may reduce revenues and increase costs.
The generation, energy marketing, and natural gas operations of the Southern Company system are subject to changes in energy prices and fuel costs, which could increase the cost of producing power, decrease the amount received from the sale of energy, and/or make electric generating facilities and natural gas distribution systems less competitive. The market prices for these commodities may fluctuate significantly over relatively short periods of time. Among the factors that could influence energy prices and fuel costs are:
prevailing market prices for coal, natural gas, uranium, fuel oil, biomass, and other fuels,time as applicable, useda result of changes in the generation facilities of the traditional electric operating companies and Southern Power and, in the case of natural gas, distributed by Southern Company Gas, including associated transportation costs, and supplies of such commodities;
supply and/or demand, for energy and the extent of additional supplies of energy available from current or new competitors;
liquidity in the general wholesale electricity and natural gas markets;
weather conditions impacting demand for electricity and natural gas;
seasonality;
transmission or transportation constraints, disruptions, or inefficiencies;
availability of competitively priced alternative energy sources;
forced or unscheduled plant outages for the Southern Company system, its competitors, or third party providers;
the financial condition of market participants;

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the economy in the Southern Company system's service territory, the nation, and worldwide, including the impact of economic conditions on demand for electricity and the demand for fuels, including natural gas;
natural disasters, wars, embargos, acts of terrorism, and other catastrophic events; and
federal, state, and foreign energy and environmental regulation and legislation.
Certain of these factorswhich could increase the expenses and/or reduce the revenues of the traditional electric operating companies, Southern Power, or Southern Company Gas and Southern Company.Registrants. For the traditional electric operating companies and Southern Company Gas' regulated gas distribution operations, such increasesimpacts may not be fully recoverable through rates. Other of these factors could reduce the revenues of
Southern Power and the traditional electric operating companies purchase natural gas as a fuel source for their power generation needs and the natural gas distribution utilities purchase natural gas for sale to their customers. Accordingly, the price of natural gas affects, among other things, Southern Power, or Southern Company GasPower's and Southern Company.the traditional electric operating companies' costs of generation and the natural gas distribution utilities' cost of natural gas. Natural gas remains a volatile commodity. Slight supply and demand imbalances can quickly result in significant price moves both up and down. These price movements may be short-lived, but the impacts can be pronounced. Natural gas supplies, primarily from the Permian and Haynesville regions, have continued to grow; however, this growth has been accompanied by LNG export growth. Forward curves project prices will remain in the range of mid-to high- $3 per mmBtu, approaching $4 per mmBtu, through 2030; however, short-term price volatility is expected and future prices could be materially impacted by various factors, including unexpected geopolitical events as well as government policies related to natural gas infrastructure development, production, and exports.
Historically, theThe traditional electric operating companies and Southern Company Gas from time to time have experienced and may continue to experience underrecovered fuel and purchased power and/or purchased gas cost balances and may experience such balances in the future.balances. While the traditional electric operating companies and Southern Company Gas are generally authorized to recover fuel and purchased power and/or purchased gas costs through cost recovery clauses, recovery may be delayed or may be denied if costs are deemed to be imprudently incurred, and delays in the authorization of such recovery could negatively impact the cash flows of the affected traditional electric operating company or Southern Company Gas and Southern Company.incurred.
The registrantsRegistrants are subject to risks associated with a changing economic environment, customer behaviors, including increased energy conservation, and adoption patterns of technologies by the customers of the traditional electric operating companies, Southern Power, and Southern Company Gas.Subsidiary Registrants.
The consumption and use of energy are fundamentally linked to economic activity. This relationship is affected over time by changes in the economy, customer behaviors, and technologies. An economic downturn could be caused by a variety of factors, including wars, geopolitical instability, acts of terrorism, political or financial crises, pandemic health events, or cyclical economic factors. Any economic downturn could negatively impact customer growth and usage per customer, thus reducing the sales of energy and revenues.customer. Additionally, any economic downturn or disruption of financial markets, both nationally and internationally, could negatively affect the financial stability of customers and counterparties of the traditional electric operating companies, Southern Power, and Southern Company Gas.Subsidiary Registrants.
Outside of economic disruptions, changes in customer behaviors in response to energy efficiency programs, changing conditions and preferences, legislation, or changes in the adoption of technologies could affect the relationship of economic activity to the consumption of energy. For example, some jurisdictions in the United States have banned the use of natural gas in new construction.
Both federal and state programs exist to influence how customers use energy, and several of the traditional electric operating companies and Southern Company Gasnatural gas distribution utilities have state PSC or other applicable state regulatory agency mandates to promote energy efficiency. Conservation programs could impact the financial results of the registrants in different ways. For example, if any traditional electric operating company or Southern Company Gas is required to invest in conservation measures that result in reduced sales from effective conservation, regulatory lag in adjusting rates for the impact of these measures could have a negative financial impact on such traditional electric operating company or Southern Company Gas and Southern Company.
Customers could also voluntarily reduce their consumption of energy in response to decreases in their disposable income, increases in energy prices, or individual conservation efforts.
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In addition, the adoption of technology by customers can have both positive and negative impacts on sales. Many new technologies utilize less energy than in the past. However, new electric and natural gas technologies such as electric and natural gas vehicles can create additional demand. The Southern Company system uses best available methods and experienceseeks to incorporate the effects of changes in customer behavior, state and federal programs, state PSC or other applicable state regulatory agency mandates, and technology, but the Southern Company system's planning processes may not appropriatelyaccurately estimate and incorporate these effects.
All of the factors discussed above could adversely affect Southern Company's, the traditional electric operating companies', Southern Power's, and/or Southern Company Gas' results of operations, financial condition, and liquidity.
The operating results of the registrantsRegistrants are affected by weather conditions and may fluctuate on a seasonal andquarterly basis. In addition, catastrophic events such as fires, earthquakes, hurricanes, tornadoes, floods, droughts, and storms, could result in substantial damage to or limit the operation of the properties of the traditional electric operating companies, Southern Power, and/or Southern Company Gas and could negatively impact results of operation, financial condition, and liquidity.a Subsidiary Registrant.
Electric power and natural gas supply are generally seasonal businesses. In many parts of the country, demand for power peaks during the summer months, with market prices also peaking at that time. In other areas, power demand peaks during the winter months. In most of the areas the traditional electric operating companies serve, electric power sales peak during the summer with a smaller peak during the winter, while in most of the areas Southern Company Gas serves, natural gas demand peaks during the winter. As a result, the overall operating results of the registrants may fluctuate substantially on a seasonal basis. In addition, the traditional electric operating companies, Southern Power, and Southern Company GasThe Subsidiary Registrants have historically sold less

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power and natural gas when weather conditions are milder. Unusually mild weather in the future could reduce the revenues, net income, and available cash of the affected registrant.
Further, volatileVolatile or significant weather events could result in substantial damage to the transmission and distribution lines of the traditional electric operating companies, the generating facilities of the traditional electric operating companies and Southern Power, and the natural gas distribution and underground storage facilities of Southern Company Gas.Gas, which is likely to negatively impact revenue. The traditional electric operating companies, Southern Power, and Southern Company GasSubsidiary Registrants have significant investments in the Atlantic and Gulf Coast regions and Southern Power has wind and natural gasSouthern Company Gas have investments in various states whichthat could be subject to severe weather as well as solar investments in various states which could be subject toand natural disasters.disasters, including hurricanes and wildfires. Further, severe drought conditions can reduce the availability of water and restrict or prevent the operation of certain generating facilities. These volatile weather events may result in unexpected increases in customer load, requiring procurement of additional power at wholesale prices, or create other grid reliability issues.
In the event a traditional electric operating company or Southern Company Gas experiences any of these weather events or any natural disaster or other catastrophic event, recovery of costs in excess of reserves and insurance coverage is subject to the approval of its state PSC or other applicable state regulatory agency. Historically, theThe traditional electric operating companies from time to time have experienced and may continue to experience deficits in their storm cost recovery reserve balances and may experience such deficits in the future. Any denial bybalances. Additionally, the applicable state PSC or other applicable state regulatory agency may deny or delay in recovery of any portion of such costs could have a material negative impact on a traditional electric operating company's or Southern Company Gas' and Southern Company's results of operations, financial condition, and liquidity.costs.
In addition, damages resulting from significant weather events occurring within thea Subsidiary Registrant's service territory of any traditional electric operating company or Southern Company Gas orotherwise affecting Southern Power'sits customers may result in the loss of customers and reduced demand for energy for extended periods. Any significant loss of customers or reduction in demand for energy could have a material negativeperiods and may impact on a traditional electric operating company's, Southern Power's, or Southern Company Gas' and Southern Company's results of operations, financial condition, and liquidity.customers' ability to perform under existing PPAs.
Acquisitions, dispositions, or other strategic ventures or investments may not result in anticipated benefits and may present risks, including risks not originally contemplated, which may have a material adverse effect on the liquidity, results of operations, and financial condition of Southern Company and its subsidiaries.contemplated.
Southern Company and its subsidiaries have made significant acquisitions, dispositions, and investments in the past and may in the future make additional acquisitions, dispositions,continue to do so. Such actions cannot be assured to be completed or other strategic ventures or investments, including the proposed sale by Pivotal Utility Holdings, a wholly-owned subsidiary ofbeneficial to Southern Company Gas, of the assets ofor its natural gas distribution utilities, Elizabethtown Gas and Elkton Gas, and the potential sale by Southern Power of a 33% equity interest in a newly-formed holding company that owns substantially all of Southern Power's solar assets.subsidiaries. Southern Company and its subsidiaries continually seek opportunities to create value through various transactions, including acquisitions or sales of assets. Specifically, Southern Power continually seeks opportunities to execute its strategy to create value through various transactions, including acquisitions, dispositions, and sales of assets,partnership interests, development and construction of new generating facilities, and entry into PPAs primarily with investor-owned utilities, independent power producers,IPPs, municipalities, and other load-serving entities, as well as commercial and industrial customers. Additionally, Southern Company Gas has made significant investments in existing pipelines, most of which are operated by third parties. If one of these agents fails to perform in a proper manner, the value of the investment could decline and Southern Company Gas could lose part or all of its investment. In addition, Southern Company Gas is required to fulfill capital obligations to pipeline joint ventures.
Southern Company and its subsidiaries may face significant competition for transactional opportunities and anticipated transactions may not be completed on acceptable terms or at all. In addition, these transactions are intended to, but may not, result in the generation of cash or income, the realization of savings, the creation of efficiencies, or the reduction of risk. These transactions may also affect the liquidity, results of operations, and financial condition of Southern Company and its subsidiaries.
These transactions also involve risks, including:
including that they may not result in an increase in income or provide an adequate or expected cash flows or return on capital or other anticipated benefits;
they may result in Southern Company or its subsidiaries entering into new or additional lines of business, which may have new or different business or operational risks;
they may not be successfully integrated into the acquiring company's operations, and/or internal control processes;
processes, and/or accounting systems; the due diligence conducted prior to a transaction may not uncover situations that could result in financial or legal exposure or the acquiring company may not appropriately evaluate the likelihood or quantify the exposure from identified risks;
they may result in impairment or decreased earnings, revenues, or cash flow;
they may result in credit rating downgrades for Southern Company or its subsidiaries; they may involve retained obligations in connection with transitional agreements or deferred payments related to dispositions that subject Southern Company or its subsidiaries to additional risk; Southern Company or the applicable subsidiary may not be able to achieve the expected financial benefits from the use of funds generated by any dispositions; expected benefits of a transaction may be dependent on the cooperation, performance, or performancecredit risk of a counterparty; minority investments in growth companies may not result in a positive return on investment; or,
for the traditional electric operating
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companies and Southern Company Gas, costs associated with such investments that were expected to be recovered through regulated rates may not be recoverable.

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Southern Company and Southern Company Gas are holding companies and areSouthern Power owns many of its assets indirectly through subsidiaries. Each of these companies is dependent on cash flows from their respective subsidiaries to meet their ongoing and future financial obligations, including making interest and principal payments on outstanding indebtedness and, for Southern Company, to pay dividends on its common stock.obligations.
Southern Company and Southern Company Gas are holding companies and, as such, they have no operations of their own. Substantially all of Southern Company's and Southern Company Gas' and many of Southern Power's respective consolidated assets are held by subsidiaries. A significant portion ofSouthern Company's, Southern Company Gas' debt is issued by its 100%-owned subsidiary,and, to a certain extent, Southern Company Gas Capital, and is fully and unconditionally guaranteed by Southern Company Gas. Southern Company's and Southern Company Gas'Power's ability to meet their respective financial obligations, including making interest and principal payments on outstanding indebtedness, and, for Southern Company, to pay dividends on its common stock, is primarily dependent on the net income and cash flows of their respective subsidiaries and the ability of those subsidiaries to pay upstream dividends or to repay borrowed funds. Prior to funding Southern Company, or Southern Company Gas, or Southern Power, the respective subsidiaries have financial obligations and, with respect to Southern Company and Southern Company Gas, regulatory restrictions and financial obligations that must be satisfied, including among others, debt service and preferred stock dividends. These subsidiaries are separate legal entities and have no obligation to provide Southern Company or Southern Company Gas with funds.service. In addition, Southern Company, and Southern Company Gas, and Southern Power may provide capital contributions or debt financing to subsidiaries under certain circumstances, which would reduce the funds available to meet their respective financial obligations, including making interest and principal payments on outstanding indebtedness, and to pay dividends on Southern Company's common stock.
A downgrade in the credit ratings of any of the registrants,Registrants, Southern Company Gas Capital, or Nicor Gas could negatively affect their ability to access capital at reasonable costs and/or could require posting of collateral or replacing certain indebtedness.
There are a number ofnumerous factors that rating agencies evaluate to arrive atdetermine credit ratings for the registrants,Registrants, Southern Company Gas Capital, and Nicor Gas, including capital structure, regulatory environment, the ability to cover liquidity requirements, and other commitments for capital.capital, and certain other controllable and uncontrollable events. The registrants,Registrants, Southern Company Gas Capital, and Nicor Gas could experience a downgrade in their ratings if any rating agency concludes that the level of business or financial risk of the industry or the applicable company has deteriorated. Changes in ratings methodologies by the agencies could also have a negative impact on credit ratings. If one or more rating agencies downgrade any registrant,Registrant, Southern Company Gas Capital, or Nicor Gas, borrowing costs likely would increase, including potential automatic increases in interest rates or fees under applicable term loans and credit facilities, the pool of investors and funding sources would likely decrease, and, particularly for any downgrade to below investment grade, significant collateral requirements may be triggered in a number of contracts. Any credit rating downgrades could require altering the mix of debt financing currently used and could require the issuance of secured indebtedness and/or indebtedness with additional restrictive covenants binding the applicable company.
Uncertainty in demand for energy can result in lower earnings or higher costs. If demand for energy falls short of expectations, it could result in potentially stranded assets. If demand for energy exceeds expectations, it could result in increased costs forpurchasing capacity in the open market or building additional electric generation and transmissionfacilities or natural gas distribution and storage facilities.
Southern Company, theThe traditional electric operating companies and Southern Power each engage in a long-term planning process to estimate the optimal mix and timing of new generation assets required to serve future load obligations. Southern Company Gas engages in a long-term planning process to estimate the optimal mix and timing of building new pipelines, and storage facilities, replacing existing pipelines, rewatering storage facilities, and entering new markets and/or expanding in existing markets. These planning processes must lookproject many years into the future in order to accommodate the long lead times associated with the permitting and construction of new generation and associated transmission facilities and natural gas distribution and storage facilities. Inherent risk exists in predicting demand this far into the future as these future loads are dependent on many uncertain factors, including economic conditions, customer usage patterns, efficiency programs, and customer technology adoption. Because regulators may not permit the traditional electric operating companies or Southern Company Gas' regulated operating companiesthe natural gas distribution utilities to adjust rates to recover the costs of new generation and associated transmission assets and/or new pipelines and related infrastructure in a timely manner or at all, Southern Company and itsthese subsidiaries may not be able to fully recover these costs or may have exposure to regulatory lag associated with the time between the incurrence of costs and the recovery in customers' rates. In addition, under Southern Power's model of selling capacity and energy at negotiated market-based rates under long-term PPAs, Southern Power might not be able to fully execute its business plan if market prices drop below original forecasts. Southern Power and/or the traditional electric operating companies may not be able to extend or replace existing PPAs or find new buyers for existing generation assets as existing PPAs expire,upon expiration, or they may be forced to market these assets at prices lower than originally intended. These situations could have negative impacts on net income and cash flows for the affected registrant.
The traditional electric operating companies are currently obligated to supply power to retail customers, andas well as wholesale customers under long-term PPAs. Southern Power is currently obligated to supply power to wholesale customers under long-

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termlong-term PPAs. At peak times, the demand for power required to meet this obligation could exceed the Southern Company system's available generation capacity. Market or competitive forces may require that the traditional electric operating companies purchase capacity onin the open market or build additional generation and transmission facilities and forthat Southern Power to purchase energy or capacity onin the open market. Because regulators may not permit the traditional electric operating companies
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to pass all of these purchase or construction costs on to their customers, the traditional electric operating companies may not be able to recover some or all of these costs or may have exposure to regulatory lag associated with the time between the incurrence of costs of purchased or constructed capacity and the traditional electric operating companies' recovery in customers' rates. Under Southern Power's long-term fixed price PPAs, Southern Power may not be able to recover all of these costs. These situations could have negative impacts on net income and cash flows for the affected registrant.
The businesses of the registrantsRegistrants and Nicor Gas are dependent on their ability to successfully access fundscapital through capital markets and financial institutions. Theinability of any of the registrants or Nicor Gas to access funds may limit its ability to execute its business plan by impacting its ability to fund capital investments or acquisitions that it may otherwise rely on to achieve future earnings and cash flows.
The registrantsRegistrants and Nicor Gas rely on access to both short-term money markets and longer-term capital markets as a significant source of liquidity forto meet capital requirements not satisfied by the cash flow from their respective operations. If any of the registrantsRegistrants or Nicor Gas is not able to access capital at competitive rates or on favorable terms, its ability to implement its business plan will be limited by impacting its abilitydue to weakened capacity to fund capital investments or acquisitions that it may otherwise rely on to achieve future earnings and cash flows. In addition, the registrantsRegistrants and Nicor Gas rely on committed bank lending agreementscredit facilities as back-up liquidity which allows themfor access to access low cost money markets. EachCertain market disruptions, whether in the United States or globally, including an economic downturn or uncertainty, continued increases in interest rates, bankruptcy or financial distress at an unrelated utility company, financial institution, or sovereign entity, capital markets volatility and disruption, either nationally or internationally, changes in tax policy, volatility in market prices for electricity and natural gas, actual or threatened cyber or physical attacks on facilities within the Southern Company system or owned by unrelated utility companies, future impacts of pandemic health events, geopolitical instability, war or threat of war, or the overall health of the registrantsutility and Nicor Gas believes that it will maintain sufficient access to these financial markets based upon current credit ratings. However, certain events or market disruptionsinstitution industries, may increase the cost of borrowing or adversely affect the ability to raise capital through the issuance of securities or other borrowing arrangements or the ability to secure committed bank lending agreements used as back-up sources of capital. Such disruptions could include:
an economic downturn or uncertainty;
bankruptcy or financial distress at an unrelated energy company, financial institution, or sovereign entity;
capital markets volatility and disruption, either nationally or internationally;
changes in tax policy;
volatility in market prices for electricity and natural gas;
terrorist attacks or threatened attacks on the Southern Company system's facilities or unrelated energy companies' facilities;
war or threat of war; or
the overall health of the utility and financial institution industries.
As of December 31, 2017, Mississippi Power's current liabilities exceeded current assets by approximately $911 million primarily due to a $900 million unsecured term loan that matures on March 31, 2018. Mississippi Power expects to refinance the unsecured term loan with external security issuances and/or borrowings fromFurthermore, some financial institutions or Southern Company. Mississippi Power has been informed by Southern Company thatmay be limited in the event sufficient funds are not available from external sources, Southern Company intendstheir ability to provide Mississippi Power with loans and/or equity to fund the remaining indebtedness to mature and other cash needs over the next 12 months.
Georgia Power's ability to make future borrowings through its term loan credit facility with the Federal Financing Bank is subjectcapital to the satisfactionRegistrants as a result of customary conditions, as well as certificationsuch financial institution's investment criteria, including criteria related to GHG.
If sources of compliance withcapital for the requirements of the loan guarantee program under Title XVII of the Energy Policy Act of 2005, including accuracy of project-related representations and warranties, delivery of updated project-related information and evidence of compliance with the prevailing wage requirements of the Davis-Bacon Act of 1931, as amended, and certification from the DOE's consulting engineer that proceeds of the advancesRegistrants or Nicor Gas are used to reimburse certainreduced, capital costs of construction relating to Plant Vogtle Units 3 and 4 that are eligible for financing under the Title XVII Loan Guarantee Program. Prior to obtaining any further advances under Georgia Power's loan guarantee agreement with the DOE, Georgia Power is required to obtain the DOE's approval of the Bechtel Agreement.could increase materially.
Failure to comply with debt covenants or conditions could adversely affect the ability of the registrants,Registrants, SEGCO, Southern Company Gas Capital, or Nicor Gas to execute future borrowings.
The debt and credit agreements of the registrants,Registrants, SEGCO, Southern Company Gas Capital, and Nicor Gas contain various financial and other covenants. Georgia Power's loan guarantee agreement with the DOE contains additional covenants, events of default, and mandatory prepayment events relating to the ongoing operation and/or construction of Plant Vogtle Units 3 and 4. Failure to meet those covenants beyond applicable grace periods could result in accelerated due dates and/or termination of the agreements, which would negatively affect the applicable company's financial condition and liquidity.

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agreements.
Volatility in the securities markets, interest rates, and other factors could substantially increase defined benefit pension and other postretirement plan costs and affect the costs offunding available for nuclear decommissioning.
The costs of providing pension and other postretirement benefit plans are dependent on a number of factors, such as the rates of return on plan assets, discount rates, the level of interest rates used to measure the required minimum funding levels of the plan, changes in actuarial assumptions, future government regulation, changes inregulations, and/or life expectancy, and the frequency and amount of the Southern Company system's required or voluntary contributions made to the plans. Changes in actuarial assumptions and differences between the assumptions and actual values, as well as a significant decline in the value of investments that fund the pension and other postretirement plans, if not offset or mitigated by a decline in plan liabilities, could increase pension and other postretirement expense, and the Southern Company system could be required from time to time to fund the pension plans with significant amounts of cash. Such cash funding obligations could have a material impact on liquidity by reducing cash flowsSee MANAGEMENT'S DISCUSSION AND ANALYSIS – ACCOUNTING POLICIES – "Application of Critical Accounting Policies and could negatively affect results of operations.Estimates – Pension and Other Postretirement Benefits" in Item 7 herein and Note 11 to the financial statements in Item 8 herein for additional information regarding the defined benefit pension and other postretirement plans. Additionally, Alabama Power and Georgia Power each hold significant assets in their nuclear decommissioning trusts to satisfy obligations to decommission Alabama Power's and Georgia Power'stheir nuclear plants. The rate of return on assets held in those trusts can significantly impact both the costs offunding available for decommissioning and the funding requirements for the trusts. See Note 6 to the financial statements under "Nuclear Decommissioning" in Item 8 herein for additional information.
Shareholder activism could cause Southern Company to incur significant expense, hinder execution of Southern Company's business strategy, and impact Southern Company's stock price.
Shareholder activism, which can take many forms and arise in a variety of situations, could result in substantial costs and divert management's and Southern Company's board's attention and resources. Additionally, such shareholder activism could give rise to perceived uncertainties as to Southern Company's future, adversely affect the Southern Company system's relationships with its employees, customers, regulators, or service providers, and make it more difficult to attract and retain qualified personnel. Also, Southern Company may be required to incur significant fees and other expenses related to activist shareholder matters,
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including for third-party advisors. Southern Company's stock price could be subject to significant fluctuation or otherwise be adversely affected by the events, risks, and uncertainties of any shareholder activism.
The registrantsRegistrants are subject to risks associated with their ability to obtain adequate insurance at acceptable costs.
The financial condition of some insurance companies, the threat of terrorism,actual or threatened physical or cyber attacks, natural disasters, and natural disasters,an increased focus on climate issues, among other things, could have disruptive effects on insurance markets. The availability of insurance covering risks that the registrants and their respective competitors typically insure against may decrease, and the insurance that the registrantsRegistrants are able to obtain may have higher deductibles, higher premiums, and more restrictive policy terms. Further, the insurance policies may not cover all of the potential exposures or the actual amount of loss incurred.
Any losses not covered by insurance, or any increases in the cost of applicable insurance, could adversely affect the results of operations, cash flows, or financial condition of the affected registrant.
The use of derivative contracts by Southern Company and its subsidiaries in thenormal course of business could result in financial losses that negatively impact thenet income of the registrantsRegistrants or in reported net income volatility.
Southern Company and its subsidiaries including the traditional electric operating companies, Southern Power, and Southern Company Gas, use derivative instruments, such as swaps, options, futures, and forwards, to manage their commodity and interest rate exposures and, to a lesser extent, manage weather and foreign currency exchange rate exposure and engage in limited trading activities. The registrantsRegistrants could recognize financial losses as a result of volatility in the market values of these contracts or if a counterparty fails to perform. These risks are managed through risk management policies, limits, and procedures, which might not work as planned and cannot entirely eliminate the risks associated with these activities. In addition, derivative contracts entered into for hedging purposes might not offset the underlying exposure being hedged as expected, resulting in financial losses. In the absence of actively quoted market prices and pricing information from external sources, the valuation of these financial instruments can involve management's judgment or use of estimates. The factors used in the valuation of these instruments become more difficult to predict and the calculations become less reliable the further into the future these estimates are made.future. As a result, changes in the underlying assumptions or use of alternative valuation methods could affect the reported fair value of these contracts.
In addition, Southern Company Gas utilizes derivative instrumentsSee Notes 13 and 14 to lock in economic value in wholesale gas services, which may not qualify or are not designated as hedges for accounting purposes. The difference in accounting treatment for the underlying position and the financial instrument used to hedge the value of the contract can cause volatilitystatements in reported net income of Southern Company and Southern Company Gas while the positions are open due to mark-to-market accounting.Item 8 herein for additional information.
Future impairments of goodwill or long-lived assets could have a material adverse effect on the registrants'Registrants' results of operations.
Goodwill is assessednot amortized, but is evaluated for impairment at least annually andor more frequently if events or circumstances occurimpairment indicators are present that would more likely than not reduce the fair value of a reporting unit below its carrying valueamount and long-lived assets are assessedtested for impairment whenever events or circumstances indicate that an asset'sasset group's carrying amount may not be recoverable. In connection with the completion of the Merger, the application of the acquisition method of accounting was pushed down to Southern Company Gas. The excess of the purchase price over the fair values of Southern Company Gas' assets and liabilities was recorded as goodwill. This resulted in a significant increase in the goodwill recorded on Southern Company's and Southern Company Gas' consolidated balance sheets. At December 31, 2017,2023, goodwill was $6.3$5.2 billion and $6.0$5.0 billion for Southern Company and Southern Company Gas, respectively.
In addition, Southern Company and its subsidiaries have long-lived assets recorded on their balance sheets. To the extent the valuecarrying amount of goodwill or long-lived assets become impaired, the affected registrantRegistrant may be required to incur impairment charges that could have a material impact on their results of operations. For example,See Notes 1, 7, 9, and 15 to the financial statements in Item 8 herein for information regarding certain impairment charges at Southern Company and Southern Company Gas.
Item 1B.UNRESOLVED STAFF COMMENTS.
None.
Item 1C.CYBERSECURITY.
Cybersecurity is a wholly-owned subsidiarycritical component of Southern Company's risk management program. The Southern Company system has implemented a cybersecurity program to assess, identify, and manage risks from cybersecurity threats that may result in material adverse effects on the Southern Company system's ability to fulfill critical business functions, including energy delivery service failures, and on the confidentiality, integrity, and availability of the Southern Company system's information systems.

Governance and Oversight of Cybersecurity Risk
Board of Directors
The Southern Company Board of Directors (Board), along with certain committees (primarily the Audit Committee of the Board) oversees the Southern Company system's enterprise risk management process. The Board devotes significant time and attention to overseeing cybersecurity risk, and the Southern Company system's approach to cybersecurity governance establishes oversight throughout the enterprise. The Board has delegated the primary responsibility to oversee cybersecurity matters to the Business Security and Resiliency Committee (BSRC) of the Board. Having a committee like the BSRC, focused on and dedicated to security, is a strong governance practice. Comprised solely of independent members of the Board, the BSRC is charged with oversight of risks related to cybersecurity, physical security, and operational resiliency. The BSRC
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Gas ownsincludes directors with an understanding of cyber issues. The BSRC meets at every regular Board meeting and operateswhen needed in the event of a natural gas storage facility consisting of two salt dome caverns where recent seismic mapping indicates that proximity of onespecific threat or emerging issue. The Chair of the cavernsBSRC regularly reports to the edgeBoard in connection with key matters the BSRC considered. The BSRC routinely receives presentations on a range of topics, including the threat environment and vulnerabilities and risks, policies, practices, technology trends, and regulatory developments, from the Chief Information Security Officer (CISO) and the legal organization and, as needed, the Chief Information Officer (CIO). The CISO reports to the BSRC at each regular committee meeting. Protocols have been established by which certain cybersecurity incidents are escalated internally and, where appropriate, reported to the BSRC, and ongoing updates regarding any such incident are provided until it has been resolved. See "Incident Response" herein.
Management
The Southern Company system has implemented a cross-functional, risk-based, "defense-in-depth" approach to preventing, detecting, identifying, mitigating, responding to, and recovering from cybersecurity threats and incidents, while also implementing controls and procedures that provide for the prompt escalation of certain cybersecurity incidents so that decisions regarding the public disclosure and reporting of such incidents can be made by management in a timely manner. Overall network efforts are led by the CISO and the Technology Security Organization (TSO), the organization responsible for implementing, monitoring, and maintaining cybersecurity practices across the Southern Company system, and aided by the Executive Vice President of Operations and the Energy Management System and Generation organization. The CISO meets regularly with the CIO and the Chief Executive Officer and reports regularly to committees of the salt dome may be less thanBoard to discuss risk management measures implemented to identify and mitigate data protection and cybersecurity risks. Security and resiliency are emphasized through business assurance, enterprise risk management, and incident response plans designed to identify, evaluate, and remediate incidents when they occur. Among other things, the required minimumCybersecurity Incident Response Plan (CIRP) establishes a team comprised of the CISO, the Deputy CISO, the Director of the Digital Defense Center, and could result inmembers of the legal and compliance organizations to evaluate emerging cyber threats and escalate to executive management and business units as appropriate. Plans, policies, and technologies are regularly updated and training exercises and crisis management preparedness activities are conducted to test effectiveness.
The CISO works closely with the legal and compliance organizations, as well as the relevant business units, to help ensure broad oversight of and compliance with legal, regulatory, and contractual cybersecurity requirements. The CISO has extensive cybersecurity knowledge and skills gained from over 30 years of work experience within the Southern Company Gas retiringsystem. The CISO receives reports on cybersecurity threats from a variety of sources both internally and externally on an ongoing basis and regularly reviews risk management measures implemented to identify and mitigate cybersecurity risks. Briefings to the cavern early. Early retirementBoard on cybersecurity matters include annual briefings to the Audit Committee and the Operations, Environmental, and Safety Committee in addition to briefings to the BSRC at each of its regular meetings (at least five times annually).
Internal Cybersecurity Team
The TSO, led by the CISO, is responsible for the implementation, monitoring, and maintenance of the cavern could trigger impairment of other long-lived assets associatedcybersecurity and data protection practices across the Southern Company system. The Southern Company system also relies on a Data Privacy and Protection team in the compliance organization, as well as the internal audit organization, to work with the natural gas storage facility.TSO on data protection policies and practices. Multiple experienced information security leaders with internal and external security experience responsible for various parts of the business report to the CISO, each of whom is supported by a team of trained cybersecurity professionals. In addition to these internal cybersecurity capabilities, external auditors and security companies are regularly engaged to assist with assessing, testing, identifying, and managing cybersecurity, including through penetration testing, vulnerability testing, and other technical evaluations.
Risk Management and Strategy
Although many of the networks are segmented, overall network security is a centralized shared service across the Southern Company system, led by the TSO and the CISO. Recognizing that no single technology, process, or business control can effectively prevent or mitigate all risks related to cyber threats, multiple technologies, processes, and controls, all working independently but as part of a cohesive strategy, are employed to reduce risk. Southern Company system exposure and defenses are regularly tested through auditing, penetration testing, vulnerability testing, and other exercises designed to assess effectiveness.
The Southern Company system emphasizes both security and resiliency through business assurance and incident response plans designed to identify, evaluate, and remediate incidents when they occur. A 24/7 security operations center is also utilized, which facilitates real-time situational awareness across the cyber-threat environment, and a robust insider threat protection program that leverages cross-function information sharing to assess insider threat activity is employed. The Southern Company system regularly reviews and updates its plans, policies, and technologies and conducts regular training exercises and crisis management preparedness activities to test their effectiveness. In addition, a subsidiarysecurity awareness program for the Southern
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Company system's employees has several leveraged lease agreements, with terms ranging upalso been implemented, which is designed to 45 years, which relate to internationaleducate and domestic energy generation, distribution, and transportation assets. Southern Company receives federal income tax deductions for depreciation and amortization, as well as interest on long-term debt related to these investments. Southern Company reviews all important lease assumptionstrain employees at least annually, or more frequently if events or changesoften as needed, about risks inherent to human interaction with information and operational technology.
The Southern Company system's cybersecurity program is increasingly leveraging intelligence-sharing capabilities about emerging threats within the energy industry, across other industries, with specialized vendors, and through public-private partnerships with U.S. government intelligence agencies. By engaging with both the Electricity Information Sharing and Analysis Center and the Downstream Natural Gas Information Sharing and Analysis Center, the Southern Company system benefits from quality analysis and rapid sharing of security information across the energy sector. Such intelligence helps to allow for better detection and prevention of emerging cyber threats before they materialize. Just as it tests its policies and plans internally, the Southern Company system also engages in circumstances indicate that a change in assumptions has occurred or may occur. With respectexternal exercises such as the bi-annual GridEx Security Exercise to Southern Company's subsidiary's investments in leveraged leases,evaluate and address the recovery of its investment is dependent on the profitable operationpreparedness of the leased assetsindustry as a whole.
Many cybersecurity policies and standards across the Southern Company system are governed by multiple regulatory requirements. Portions of these policies and standards are audited by the respective lessees. A significant deteriorationFERC, the Transportation Security Administration, and the NRC, as appropriate, and are periodically evaluated by third parties such as cybersecurity insurance carriers. Certain members of senior management have high-level security clearances to facilitate access to critical information, and the Southern Company system participates in pilot programs with industry and the U.S. government to share additional information and strengthen cybersecurity and business resiliency.
The Southern Company system also employs systems and processes designed to oversee, identify, and reduce the potential impact of a security incident at a third-party vendor, service provider, or customer or otherwise implicating the third-party technology and systems used. Among other things, the Southern Company system has established a Vendor Security Incident Working Group to address such third-party security incidents, including following up with the third party as appropriate and taking steps to mitigate any impact to systems. The Vendor Security Incident Working Group includes members of the internal cybersecurity teams to address any incidents that may invoke the CIRP. Additionally, the Southern Company system typically imposes contractual obligations on vendors and other third-party business partners related to privacy, confidentiality, and data security based on their access to the Southern Company system's data and systems. The Southern Company system also maintains insurance coverage for cyber incidents; the scope of coverage and fitness of coverage is evaluated each year.
Incident Response
The Southern Company system has adopted a CIRP that applies in the performanceevent of certain cybersecurity threats or incidents to provide a standardized guide for responding to security incidents. The CIRP sets out a coordinated approach to investigating, containing, documenting, and mitigating incidents, including reporting findings and keeping senior management and other key stakeholders informed and involved as appropriate. In general, the leased asset couldincident response process follows the National Institute of Standards and Technology guidance and focuses on four phases: preparation; detection and analysis; containment, eradication, and recovery; and post-incident remediation. The CIRP is reviewed periodically to help ensure its applicability to any changing needs or circumstances and to provide users a tactical tool to effectively respond to incidents. The CIRP applies to all Southern Company system personnel (including third-party contractors, vendors, and partners) that perform functions or services requiring access to secure Southern Company system information and to all devices and network services that are owned or managed by the Southern Company system. A full tabletop exercise is performed at least annually, including stakeholders from business units beyond technology security, such as power delivery, legal, compliance, risk management, and corporate communications. In addition, the Southern Company system participates in sector-level and cross-sector exercises led by industry or the U.S. government. In the event of an incident, the technology security organization, the legal organization, and other stakeholders frequently review lessons learned after an incident has been remediated.
Material Cybersecurity Risks, Threats, and Incidents
Due to evolving cybersecurity threats, it has and will continue to be difficult to prevent, detect, mitigate, and remediate cybersecurity incidents. Risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, have not materially affected the Southern Company system, including its business strategy, results of operations, or financial condition. While the Southern Company system has not experienced any material cybersecurity incidents, there can be no guarantee that it will not be the subject of future successful attacks, threats, or incidents. Additional information on cybersecurity risks can be found in Item 1A "Risk Factors" of this Form 10-K which should be read in conjunction with the impairment of the related lease receivable.

foregoing information.
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Item 1B.UNRESOLVED STAFF COMMENTS.
None.

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Item 2. PROPERTIES
Electric
Electric Properties
TheAt December 31, 2023, the traditional electric operating companies, Southern Power, and SEGCO at December 31, 2017, owned and/or operated 33 hydroelectricthe generating stations, 29 fossil fuel generating stations, three nuclear generating stations, 15 combined cycle/cogeneration stations, 35 solar facilities eight wind facilities, one biomass facility, and one landfill gas facility. The amounts of capacity for each company, as of December 31, 2017, are shownlisted in the table below. The traditional electric operating companies have certain jointly-owned generating stations. For these facilities, the nameplate capacity shown represents the Registrant's portion of total plant capacity, with ownership percentages provided if less than 100%. See "Jointly-Owned Facilities" and "Titles to Property" herein and Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for additional information.
Company/Facility Type(a)/Facility Name/
Ownership Percentage
LocationNameplate
Capacity (KWs)
Alabama Power
Coal
Barry Unit 5Mobile, AL700,000 
Gaston Unit 5Wilsonville, AL880,000 
Miller (95.92%)Birmingham, AL2,532,288 
Total Coal4,112,288 
Natural Gas
Combined Cycle:
Barry Units 6 through 8Mobile, AL1,706,424 
Central Alabama Generating StationAutauga County, AL885,000 
Combustion Turbine:
Calhoun Generating StationCalhoun County, AL748,000 
Greene CountyDemopolis, AL720,000 
Steam:
Barry Units 1, 2, and 4Mobile, AL600,000 
Greene County Units 1 and 2 (60%)Demopolis, AL300,000 
Total Natural Gas4,959,424 
Nuclear
FarleyDothan, AL1,720,000 
Hydro
BankheadHolt, AL53,985 
BouldinWetumpka, AL225,000 
HarrisWedowee, AL132,000 
HenryOhatchee, AL72,900 
HoltHolt, AL46,944 
JordanWetumpka, AL100,000 
LayClanton, AL177,000 
Lewis SmithJasper, AL157,500 
Logan MartinVincent, AL135,000 
MartinDadeville, AL182,000 
MitchellVerbena, AL170,000 
ThurlowTallassee, AL81,000 
WeissLeesburg, AL87,750 
YatesTallassee, AL47,000 
Total Hydro1,668,079 
I-29
Generating StationLocation
Nameplate
Capacity (1)

 
  (KWs)
 
FOSSIL STEAM   
GadsdenGadsden, AL120,000
 
GorgasJasper, AL1,021,250
 
BarryMobile, AL1,300,000
 
Greene CountyDemopolis, AL300,000
(2)
Gaston Unit 5Wilsonville, AL880,000
 
MillerBirmingham, AL2,532,288
(3)
Alabama Power Total 6,153,538
 
BowenCartersville, GA3,160,000
 
HammondRome, GA800,000
 
McIntoshEffingham County, GA163,117
 
SchererMacon, GA750,924
(4)
WansleyCarrollton, GA925,550
(5)
YatesNewnan, GA700,000
 
Georgia Power Total 6,499,591
 
CristPensacola, FL970,000
 
DanielPascagoula, MS500,000
(6)
Scherer Unit 3Macon, GA204,500
(4)
Gulf Power Total 1,674,500
 
DanielPascagoula, MS500,000
(6)
Greene CountyDemopolis, AL200,000
(2)
WatsonGulfport, MS862,000
 
Mississippi Power Total 1,562,000
 
Gaston Units 1-4Wilsonville, AL  
SEGCO Total 1,000,000
(7)
Total Fossil Steam 16,889,629
 
NUCLEAR STEAM   
FarleyDothan, AL  
Alabama Power Total 1,720,000
 
HatchBaxley, GA899,612
(8)
Vogtle Units 1 and 2Augusta, GA1,060,240
(9)
Georgia Power Total 1,959,852
 
Total Nuclear Steam 3,679,852
 
COMBUSTION TURBINES   
Greene CountyDemopolis, AL  
Alabama Power Total 720,000
 
BoulevardSavannah, GA19,700
 

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Generating StationLocation
Nameplate
Capacity (1)

 
McDonough Unit 3Atlanta, GA78,800
 
McIntosh Units 1 through 8Effingham County, GA640,000
 
McManusBrunswick, GA481,700
 
RobinsWarner Robins, GA158,400
 
WansleyCarrollton, GA26,322
(5)
WilsonAugusta, GA354,100
 
Georgia Power Total 1,759,022
 
Lansing Smith Unit ASouthport, FL39,400
 
Pea Ridge Units 1 through 3Pea Ridge, FL15,000
 
Gulf Power Total 54,400
 
Chevron Cogenerating StationPascagoula, MS147,292
(10)
SweattMeridian, MS39,400
 
WatsonGulfport, MS39,360
 
Mississippi Power Total 226,052
 
AddisonThomaston, GA668,800
 
Cleveland CountyCleveland County, NC720,000
 
DahlbergJackson County, GA756,000
 
OleanderCocoa, FL791,301
 
RowanSalisbury, NC455,250
 
Southern Power Total 3,391,351
 
Gaston (SEGCO)
Wilsonville, AL19,680
(7)
Total Combustion Turbines 6,170,505
 
COGENERATION   
Washington CountyWashington County, AL123,428
 
Lowndes CountyBurkeville, AL104,800
 
TheodoreTheodore, AL236,418
 
Alabama Power Total 464,646
 
COMBINED CYCLE   
BarryMobile, AL  
Alabama Power Total 1,070,424
 
McIntosh Units 10&11Effingham County, GA1,318,920
 
McDonough-Atkinson Units 4 through 6Atlanta, GA2,520,000
 
Georgia Power Total 3,838,920
 
Lansing Smith Unit 3Southport, FL  
Gulf Power Total 545,500
 

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Generating StationLocation
Nameplate
Capacity (1)

 
DanielPascagoula, MS1,070,424
 
Kemper County/RatcliffeKemper County, MS769,898
(11)
Mississippi Power Total 1,840,322
 
FranklinSmiths, AL1,857,820
 
HarrisAutaugaville, AL1,318,920
 
MankatoMankato, MN375,000
 
RowanSalisbury, NC530,550
 
Stanton Unit AOrlando, FL428,649
(12)
WansleyCarrollton, GA1,073,000
 
Southern Power Total 5,583,939
 
Total Combined Cycle 12,879,105
 
HYDROELECTRIC FACILITIES   
BankheadHolt, AL53,985
 
BouldinWetumpka, AL225,000
 
HarrisWedowee, AL132,000
 
HenryOhatchee, AL72,900
 
HoltHolt, AL46,944
 
JordanWetumpka, AL100,000
 
LayClanton, AL177,000
 
Lewis SmithJasper, AL157,500
 
Logan MartinVincent, AL135,000
 
MartinDadeville, AL182,000
 
MitchellVerbena, AL170,000
 
ThurlowTallassee, AL81,000
 
WeissLeesburg, AL87,750
 
YatesTallassee, AL47,000
 
Alabama Power Total 1,668,079
 
Bartletts FerryColumbus, GA173,000
 
Goat RockColumbus, GA38,600
 
Lloyd ShoalsJackson, GA14,400
 
Morgan FallsAtlanta, GA16,800
 
North HighlandsColumbus, GA29,600
 
Oliver DamColumbus, GA60,000
 
Rocky MountainRome, GA215,256
(13)
Sinclair DamMilledgeville, GA45,000
 
Tallulah FallsClayton, GA72,000
 
TerroraClayton, GA16,000
 
TugaloClayton, GA45,000
 
Wallace DamEatonton, GA321,300
 
YonahToccoa, GA22,500
 
6 Other PlantsVarious Georgia locations18,080
 
Georgia Power Total 1,087,536
 
Total Hydroelectric Facilities 2,755,615
 

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Generating StationLocation
Nameplate
Capacity (1)

 
RENEWABLE SOURCES:   
SOLAR FACILITIES   
Fort BenningColumbus, GA30,000
 
Fort GordonAugusta, GA30,000
 
Fort StewartFort Stewart, GA30,000
 
Kings BayCamden County, GA30,000
 
DaltonDalton, GA6,012
 
3 Other PlantsVarious Georgia locations2,984
 
Georgia Power Total 128,996
 
AdobeKern County, CA20,000
 
ApexNorth Las Vegas, NV20,000
 
Boulder IClark County, NV100,000
(14)
ButlerTaylor County, GA103,700
 
Butler Solar FarmTaylor County, GA22,000
 
CalipatriaImperial County, CA20,000
 
Campo VerdeImperial County, CA147,420
 
CimarronSpringer, NM30,640
 
Decatur CountyDecatur County, GA20,000
 
Decatur ParkwayDecatur County, GA84,000
 
Desert StatelineSan Bernadino County, CA299,900
(14)
East PecosPecos County, TX120,000
 
GarlandKern County, CA205,130
(14)
GranvilleOxford, NC2,500
 
HenriettaKings County, CA102,000
(14)
Imperial ValleyImperial County, CA163,200
(14)
LamesaDawson County, TX102,000
 
Lost Hills - BlackwellKern County, CA33,440
(14)
Macho SpringsLuna County, NM55,000
 
Morelos del SolKern County, CA15,000
 
North StarFresno County, CA61,600
(14)
PawpawTaylor County, GA30,480
 
RoserockPecos County, TX160,000
(14)
RutherfordRutherford County, NC74,800
 
SandhillsTaylor County, GA146,890
 
SpectrumClark County, NV30,240
 
TranquillityFresno County, CA205,300
(14)
Southern Power Total 2,375,240
(15)
Total Solar 2,504,236
 

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Generating StationLocation
Nameplate
Capacity (1)

 
WIND FACILITIES   
BethelCastro County, TX276,000
 
Grant PlainsGrant County, OK147,200
 
Grant WindGrant County, OK151,800
 
Kay WindKay County, OK299,000
 
PassadumkeagPenobscot County, ME42,900
 
Salt ForkDonley & Gray Counties TX174,000
 
Tyler BluffCooke County, TX125,580
 
Wake WindCrosby & Floyd Counties, TX257,250
(14)
Southern Power Total 1,473,730
 
LANDFILL GAS FACILITY   
PerdidoEscambia County, FL  
Gulf Power Total 3,200
 
BIOMASS FACILITY   
NacogdochesSacul, TX  
Southern Power Total 115,500
 
Total Generating Capacity 46,936,018
 
Notes:
Company/Facility Type(a)/Facility Name/
Ownership Percentage
LocationNameplate
Capacity (KWs)
(1)CogenerationSee "Jointly-Owned Facilities" herein for additional information.
(2)Lowndes CountyOwned byBurkeville, AL104,800 
TheodoreTheodore, AL236,418 
Washington CountyWashington County, AL123,428 
Total Cogeneration464,646 
Solar
Anniston Army DepotDale County, AL7,380 
Fort RuckerCalhoun County, AL10,560 
Total Solar17,940 
Total Alabama Power and Mississippi Power as tenants in common in the proportions of 60% and 40%, respectively.Generating Capacity12,942,377
(3)Capacity shown is Alabama Power's portion (95.92%) of total plant capacity.
(4)Capacity shown for
Georgia Power is 8.4%
Natural Gas
Combined Cycle:
McDonough-Atkinson Units 4 through 6Atlanta, GA2,520,000 
McIntosh Units 10 and 11Effingham County, GA1,318,920 
Combustion Turbine:
McDonough Unit 3Atlanta, GA78,800 
McIntosh Units 1 through 8Effingham County, GA640,000 
McManusBrunswick, GA481,700 
RobinsWarner Robins, GA158,400 
WilsonAugusta, GA354,100 
Steam:
YatesNewnan, GA700,000 
Total Natural Gas6,251,920 
Coal
BowenCartersville, GA3,160,000 
Scherer (8.4% of Units 1 and 2 and 75% of Unit 3. Capacity shown for Gulf Power is 25% of Unit 3.3)Macon, GA750,924 
Total Coal3,910,924 
Nuclear
Hatch (50.1%)Baxley, GA899,612 
Vogtle Units 1 through 3 (45.7%)Augusta, GA1,613,667 
Total Nuclear2,513,279 
Hydro
Bartletts FerryColumbus, GA173,000 
BurtonClayton, GA8,100 
Flint RiverAlbany, GA5,400 
Goat RockColumbus, GA40,500 
Lloyd ShoalsJackson, GA18,000 
Morgan FallsAtlanta, GA16,800 
NacoocheeLakemont, GA4,800 
North HighlandsColumbus, GA29,600 
Oliver DamColumbus, GA60,000 
Rocky Mountain (25.4%)Rome, GA229,362 (b)
(5)Sinclair DamCapacity shown is Georgia Power's portion (53.5%) of total plant capacity.Milledgeville, GA45,000 
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(6)
Company/Facility Type(a)/Facility Name/
Ownership Percentage
Represents 50% of Plant LocationNameplate
Capacity (KWs)
Tallulah FallsClayton, GA72,000 
TerroraClayton, GA20,800 
TugaloClayton, GA45,000 
Wallace DamEatonton, GA321,300 
YonahToccoa, GA22,500 
Total Hydro1,112,162 
Solar
Fort BenningColumbus, GA30,005 
Fort GordonAugusta, GA30,000 
Fort StewartFort Stewart, GA30,000 
Fort ValleyFort Valley, GA10,800 
Kings BayCamden County, GA30,161 
Marine Corps Logistics BaseAlbany, GA31,161 
Moody Air Force BaseValdosta, GA49,500 
Robins Air Force BaseWarner Robins, GA128,000 
8 Other PlantsVarious Georgia locations18,479 
Total Solar358,106 
Total Georgia Power Generating Capacity14,146,391
Mississippi Power
Natural Gas
Combined Cycle:
DanielPascagoula, MS1,070,424 
RatcliffeKemper County, MS769,898 
Combustion Turbine:
SweattMeridian, MS39,400 
WatsonGulfport, MS39,360 
Steam:
Greene County Units 1 and 2 which are owned as tenants in common by Gulf Power and Mississippi Power.(40%)Demopolis, AL200,000 
WatsonGulfport, MS750,000 
Total Natural Gas2,869,082 
Coal
Daniel (50%)Pascagoula, MS500,000 
Cogeneration
Chevron Cogenerating StationPascagoula, MS147,292 (c)
(7)SolarSEGCO is jointly-owned by Alabama
Walnut GroveWalnut Grove, MS1,500 
Total Mississippi Power Generating Capacity3,517,874
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Company/Facility Type(a)/Facility Name/
Ownership Percentage
LocationNameplate
Capacity (KWs)
Southern Power
Natural Gas
Combined Cycle:
FranklinSmiths, AL1,857,820 
HarrisAutaugaville, AL1,318,920 
Rowan Unit 4Salisbury, NC530,550 
Wansley Units 6 and Georgia Power. See BUSINESS in Item7Carrollton, GA1,073,000 
Combustion Turbine:
AddisonThomaston, GA668,800 
ClevelandCleveland County, NC720,000 
DahlbergJackson County, GA756,000 
Rowan Units 1 herein for additional information.through 3Salisbury, NC455,250 
Total Natural Gas7,380,340 
Wind
Beech Ridge IIGreenbrier County, WV56,200 
BethelCastro County, TX276,000 
Cactus FlatsConcho County, TX148,350 
Deuel HarvestDeuel County, SD301,100 
Glass SandsMurray County, OK118,300 
Grant PlainsGrant County, OK147,200 
Grant WindGrant County, OK151,800 
Kay WindKay County, OK299,000 
PassadumkeagPenobscot County, ME42,900 
ReadingOsage & Lyon Counties, KS200,100 
Salt ForkDonley & Gray Counties, TX174,000 
SkookumchuckLewis & Thurston Counties, WA136,800 
Tyler BluffCooke County, TX125,580 
Wake WindCrosby & Floyd Counties, TX257,250 
Wildhorse MountainPushmataha County, OK100,000 
Total Wind2,534,580 (d)
(8)Solar
AdobeKern County, CA20,000 
ApexNorth Las Vegas, NV20,000 
Boulder IClark County, NV100,000 
ButlerTaylor County, GA104,000 
Butler Solar FarmTaylor County, GA22,000 
CalipatriaImperial County, CA20,000 
Campo VerdeImperial County, CA147,420 
CimarronColfax County, NM30,640 
Decatur CountyDecatur County, GA20,000 
Decatur ParkwayDecatur County, GA84,000 
Desert StatelineSan Bernadino County, CA299,990 
East PecosPecos County, TX120,000 
GarlandKern County, CA205,290 
Gaskell West IKern County, CA20,000 
GranvilleGranville County, NC2,500 
HenriettaKings County, CA102,000 
Imperial ValleyImperial County, CA163,200 
LamesaDawson County, TX102,000 
Lost Hills-BlackwellKern County, CA32,000 
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Table of ContentsIndex to Financial Statements
Company/Facility Type(a)/Facility Name/
Ownership Percentage
LocationNameplate
Capacity shown is Georgia Power's portion (50.1%) of total plant capacity.(KWs)
Macho SpringsLuna County, NM55,000 
Morelos del SolKern County, CA15,000 
North StarFresno County, CA61,600 
PawpawTaylor County, GA30,480 
RoserockPecos County, TX160,000 
RutherfordRutherford County, NC74,800 
SandhillsTaylor County, GA148,000 
SpectrumClark County, NV30,240 
TranquillityFresno County, CA205,300 
Total Solar2,395,460 (e)
(9)Battery StorageCapacity shown is Georgia Power's portion (45.7%) of total plant capacity.
GarlandKern County, CA88,000 (f)
(10)TranquillityGeneration is dedicated to a single industrial customer.Fresno County, CA72,000 (f)
(11)Total Battery StorageThe capacity shown is the gross capacity using natural gas fuel without supplemental firing.160,000 
Fuel Cell
Red Lion and BrooksideNew Castle and Newark, DE27,500 (g)
(12)
Total Southern Power Generating Capacity12,497,880
SEGCO
Gaston Units 1 through 4 (Natural Gas-Steam)Wilsonville, AL1,000,000 
Gaston (Natural Gas-Combustion Turbine)Wilsonville, AL19,680 
Total SEGCO Generating Capacity shown is Southern Power's portion (65%) of total plant capacity.1,019,680(h)
(13)Capacity shown is Georgia Power's portion (25.4%) of total plant capacity. OPC operates the plant.
(14)Each facility is owned by Southern Power through a majority-owned subsidiary (90.1% Wake Wind, 66% Desert Stateline, and 51% for each of the following facilities: Boulder 1, Garland, Henrietta, Imperial Valley, Lost Hills-Blackwell, North Star, Roserock, and Tranquillity). The capacity shown in the table is 100% of the nameplate capacity for the respective facility.
(15)Southern Company System
Natural Gas22,480,446 
Coal8,523,212 
Nuclear4,233,279 
Hydro2,780,241 
Solar2,773,006 
Wind2,534,580 
Cogeneration611,938 
Battery Storage160,000 
Fuel Cell27,500 
Total Southern Power is pursuing the sale of a 33% equity interest in a newly-formed holding company that owns substantially all of Southern Power's solar assets, which, if successful, is expected to close in the middle of 2018.Company System Generating Capacity44,124,202
(a)Represents the primary fuel source.
(b)Operated by OPC.
(c)Generation is dedicated to a single industrial customer. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" in Item 7 herein.
(d)Southern Power is the controlling partner in a non-tax equity partnership for Beech Ridge II and also owns 100% of Glass Sands. Southern Power is the controlling partner in tax equity partnerships owning Cactus Flats, Deuel Harvest, Reading, Skookumchuck, and Wildhorse Mountain (additionally for Deuel Harvest and Skookumchuck, a noncontrolling interest in Southern Power's remaining equity is owned by another partner). Southern Power is the controlling partner in SP Wind (a tax equity partnership owning the remaining eight Southern Power wind facilities). SP Wind is the 90.1% majority owner of Wake Wind and owns 100% of the other SP Wind facilities. All of these entities are consolidated subsidiaries of Southern Power and the capacity shown in the table is 100% of the nameplate capacity for the respective facility.
(e)Southern Power owns a 67% equity interest in SP Solar (a limited partnership indirectly owning all of Southern Power's solar facilities, except the Gaskell West I and Roserock solar facilities). SP Solar is the 51% majority owner of Boulder I, Garland, Henrietta, Imperial Valley, Lost Hills Blackwell, North Star, and Tranquillity solar facilities; the 66% majority owner of Desert Stateline solar facility; and the sole owner of the remaining SP Solar solar facilities. Southern Power is the controlling partner in a tax equity partnership owning Gaskell West I and also owns 100% of Roserock. All of these entities are consolidated subsidiaries of Southern Power and the capacity shown in the table is 100% of the nameplate capacity for the respective facility.
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(f)Southern Power is the controlling partner in a tax equity partnership owning the Garland and Tranquillity battery energy storage facilities. Additionally, the noncontrolling interests in Southern Power's remaining equity are owned by two other partners and the facilities are indirect subsidiaries of SP Solar. These entities are consolidated subsidiaries of Southern Power and the capacity shown in the table is 100% of the nameplate capacity for the respective facility.
(g)Southern Power has two noncontrolling interest partners that own approximately 10 MWs of the facility. These entities are consolidated subsidiaries of Southern Power and the capacity shown in the table is 100% of the nameplate capacity for the respective facility.
(h)Alabama Power and Georgia Power each own 50% of the outstanding common stock of SEGCO, an operating public utility company. Alabama Power and Georgia Power are each entitled to one-half of SEGCO's capacity and energy. Alabama Power acts as SEGCO's agent in the operation of SEGCO's units and furnishes fuel to SEGCO for its units. See Note 7 to the financial statements under "SEGCO" in Item 8 herein for additional information.
See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Environmental Matters" in Item 7 herein and Note 2 to the financial statements under "Alabama Power – Environmental Accounting Order," "Georgia Power – Integrated Resource Plans," and "Mississippi Power – Integrated Resource Plan" in Item 8 herein for information regarding plans to retire or convert to natural gas certain coal-fired generating capacity included in the table above.
Except as discussed below under "Titles to Property," the principal plants and other important units of the traditional electric operating companies, Southern Power, and SEGCO are owned in fee by the respective companies. It is the opinion of management of each such company that its operating properties are adequately maintained and are substantially in good operating condition, and suitable for their intended purpose.
Mississippi Power owns a 79-mile length of 500-kilovolt transmission line which is leased to Entergy Gulf States Louisiana, LLC. The line completed in 1984, extends from Plant Daniel to the Louisiana state line. Entergy Gulf States Louisiana, LLC is

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paying a use fee over a 40-year period covering all expenses and the amortization of the original $57 million costcapitalized costs through the expiration of the line.agreement between the parties on May 31, 2024. At December 31, 2017,2023, the unamortized portion of this cost was approximately $13$1 million.
Mississippi Power owns a lignite mine and equipment that werewas intended to provide fuel for the Kemper IGCC. Mississippi Power also has acquired mineral reserves located around the Kemper County energy facility. The mine, operated by North American Coal Corporation, started commercial operation in 2013. Liberty Fuels Company, LLC, the operator of the mine, has a legal obligation to perform mine reclamation and Mississippi Power has a contractual obligation to fund all reclamation activities. Mississippi Power expectsAs a result of the abandonment of the Kemper IGCC, final mine reclamation activitiesbegan in 2018 and was substantially completed in 2020, with monitoring expected to begin in 2018.continue through 2028. See MANAGEMENT'S DISCUSSION AND ANALYSIS – FUTURE EARNINGS POTENTIAL – "Kemper County Energy Facility – Lignite Mine and CO2 Pipeline Facilities" of Mississippi Power in Item 7 herein and Note 3 to the financial statements of Southern Company andunder "Other Matters – Mississippi Power under "Kemper– Kemper County Energy FacilityFacility" in Item 8 herein for additional information.
In conjunction with Southern Company's 2019 sale of Gulf Power, Mississippi Power and NextEra Energy agreed to negotiate a mutually acceptable revised operating agreement for Plant Daniel. In July 2022, the co-owners executed a revised operating agreement. The dispatch procedures in the revised operating agreement for the two jointly-owned coal units at Plant Daniel resulted in Mississippi Power designating one of the two units as primary and the other as secondary in lieu of each company separately owning 100% of a single generating unit. Mississippi Power did not exercise an option to purchase its co-owner's ownership interest for $1 on January 15, 2024. See Notes 2 and 3 under "Mississippi PowerLignite MineIntegrated Resource Plan" and CO2 Pipeline Facilities""Other Matters – Mississippi Power – Plant Daniel," respectively, in Item 8 herein for additional information on the lignite mine.Plant Daniel.
In 2018, Mississippi Power will file a reserve margin plan which could impact Mississippi Power's generating stations as well as the generating stations jointly owned by Mississippi Power and other traditional electric operating companies. See BUSINESS in Item 1 herein under "Rate Matters – Integrated Resource Planning – Mississippi Power" for additional information.
In 2017,2023, the maximum demand on the traditional electric operating companies, Southern Power Company, and SEGCO was 34,874,00036,919,000 KWs and occurred on August 17, 2017.14, 2023. The all-time maximum demand of 38,777,00037,035,000 KWs on the traditional electric operating companies, Southern Power, and SEGCO occurred on August 22, 2007.June 15, 2022. These amounts exclude demand served by capacity retained by MEAG Power, OPC, and SEPA. The reserve margin for the traditional electric operating companies, Southern Power Company, and SEGCO in 20172023 was 30.8%19%. See SELECTED FINANCIAL DATA in Item 6 herein for additional information.
Jointly-Owned Facilities
Alabama Power, Georgia Power, and SouthernMississippi Power at December 31, 20172023 had undivided interests in certain generating plants and other related facilities with non-affiliated parties. The percentages of ownership of the total plant or facility are as follows:
Percentage Ownership
Total
Capacity
Alabama
Power
Power
South
Georgia
Power
Mississippi
Power
OPCMEAG
Power
DaltonFP&L
(MWs)
Plant Miller Units 1 and 21,320 91.8 %8.2 %— %— %— %— %— %— %
Plant Hatch1,796 — — 50.1 — 30.0 17.7 2.2 — 
Plant Vogtle Units 1 through 33,531 — — 45.7 — 30.0 22.7 1.6 — 
Plant Scherer Units 1 and 21,636 — — 8.4 — 60.0 30.2 1.4 — 
Plant Scherer Unit 3818 — — 75.0 — — — — 25.0 
Rocky Mountain903 — — 25.4 — 74.6 — — — 
Plant Daniel Units 1 and 21,000 — — — 50.0 — — — 50.0 
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    Percentage Ownership
  
Total
Capacity
 
Alabama
Power
 
Power
South
 
Georgia
Power
 OPC 
MEAG
Power
 Dalton  
Southern
Power
 OUC FMPA KUA
  (MWs)                     
Plant Miller
Units 1 and 2
 1,320
 91.8% 8.2% % % % %  % % % %
Plant Hatch 1,796
 
 
 50.1
 30.0
 17.7
 2.2
  
 
 
 
Plant Vogtle
Units 1 and 2
 2,320
 
 
 45.7
 30.0
 22.7
 1.6
  
 
 
 
Plant Scherer
Units 1 and 2
 1,636
 
 
 8.4
 60.0
 30.2
 1.4
  
 
 
 
Plant Wansley 1,779
 
 
 53.5
 30.0
 15.1
 1.4
  
 
 
 
Rocky Mountain 848
 
 
 25.4
 74.6
 
 
  
 
 
 
Plant Stanton A 660
 
 
 
 
 
 
  65.0
 28.0
 3.5
 3.5
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Alabama Power, Georgia Power, and GeorgiaMississippi Power have contracted to operate and maintain the respective units in which each has an interest (other than Rocky Mountain) as agent for the joint owners. SCS provides operation and maintenance services for Plant Stanton A. Southern Nuclear operates and provides services to Alabama Power's and Georgia Power's nuclear plants.
In addition, Georgia Power has commitments, in the form of capacity purchases totaling $39 million, regarding a portion of a 5% interest in the original cost of Plant Vogtle Units 1 and 2 owned by MEAG Power that are in effect until the later of the retirement of the plant or the latest stated maturity date of MEAG Power's bonds issued to finance such ownership interest. The payments for capacity are required whether any capacity is available. The energy cost is a function of each unit's variable operating costs. Except for the portion of the capacity payments related to the Georgia PSC's disallowances of Plant Vogtle Units 1 and 2 costs, the cost of such capacity and energy is included in purchased power from non-affiliates in Georgia Power's statements of income in Item 8 herein. Also seeSee Note 73 to the financial statements of Georgia Power under "Commitments – Fuel and Purchased Power Agreements""Commitments" in Item 8 herein for additional information.

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Construction continues on Plant Vogtle Units 3 and 4, which are jointly owned by the Vogtle Owners (with each owner currently holding the same undivided ownership interest as shown in the table above with respect to Plant Vogtle Units 1 and 2). See Note 32 to the financial statements of Southern Company and Georgiaunder "Georgia Power under "Nuclear Construction" and "Retail Regulatory Matters – Nuclear Construction," respectively,Construction" in Item 8 herein.
Titles to Property
The traditional electric operating companies', Southern Power's, and SEGCO's interests in the principal plants (other than certain pollution control facilities and the land on which five combustion turbine generators of Mississippi Power are located, which is held by easement) and other important units of the respective companies are owned in fee by such companies, subject only to the following major encumbrances: (1) liens pursuant to pollution control revenue bonds of Gulf Power on specific pollution control facilities at Plant Daniel, (2) liens pursuant to the assumption of debt obligationsa leasehold interest granted by Mississippi Power in connection with the acquisition of Plant Daniel Units 3 and 4, (3) liens pursuant to the agreements entered into with Mississippi Power's largest retail customer, Chevron Products Company (Chevron), on October 4, 2017, on the co-generation assets located at the Chevron refinery, (4)where five combustion turbines owned by Mississippi Power are located and used for co-generation, as well as liens on these assets pursuant to the related co-generation agreements and (2) liens associated with Georgia Power's reimbursement obligations to the DOE under its loan guarantee, which are secured by a first priority lien on (a) Georgia Power's 45.7% undivided ownership interest in Plant Vogtle Units 3 and 4 and (b) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4, and (5) liens associated with two PPAs assumed as part of the acquisition of the Mankato project in October 2016 by Southern Power Company.4. See Note 65 to the financial statements of Southern Company, Georgia Power, Gulf Power, Mississippi Power, and Southern Power under "Assets Subject to Lien,"Lien" and Note 68 to the financial statements of Southern Company and Georgia Power under "DOE Loan Guarantee Borrowings," and Note 6 to the financial statements of Southern Company and Mississippi Power under "Plant Daniel Revenue Bonds""Long-term Debt" in Item 8 herein for additional information. The traditional electric operating companies own the fee interests in certain of their principal plants as tenants in common. See "Jointly-Owned Facilities" herein and Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for additional information. Properties such as electric transmission and distribution lines, steam heating mains, and gas pipelines are constructed principally on rights-of-way, which are maintained under franchise or are held by easement only. A substantial portion of lands submerged by reservoirs is held under flood right easements. In addition, certain of the renewable generating facilities occupy or use real property that is not owned, primarily through various leases, easements, rights-of-way, permits, or licenses from private landowners or governmental entities.
Natural Gas
Southern Company Gas considers its properties to be adequately maintained, substantially in good operating condition, and suitable for their intended purpose. The following providessections provide the location and general character of the materially important properties that are used by the segments of Southern Company Gas. Substantially all of Nicor Gas' properties are subject to the lien of the indenture securing its first mortgage bonds. See Note 68 to the financial statements of Southern Company Gas under "Long-Term Debt – First Mortgage Bonds" in Item 8 herein for additional information.
Distribution and Transmission Mains
Southern Company Gas' distribution systems transport natural gas from its pipeline suppliers to customers in its service areas. These systems consist primarily of distribution and transmission mains, compressor stations, peak shaving/storage plants, service lines, meters, and regulators. At December 31, 2017,2023, Southern Company Gas' gas distribution operations segment owned approximately 82,00077,900 miles of underground distribution and transmission mains, which are located on easements or rights-of-way that generally provide for perpetual use.
Storage Assets
Gas Distribution Operations
Southern Company Gas owns and operates eight underground natural gas storage facilitiesfields in Illinois with a total inventoryworking capacity of approximately 150 Bcf, approximately 135 Bcf of which can beis usually cycled on an annual basis. This system is designed to meet about 50% of the estimated peak-day deliveries and approximately 40% of the normal winter deliveries in Illinois. This level of storage capability provides Nicor Gas with supply flexibility, improves the reliability of deliveries, and helps mitigate the risk associated with seasonal price movements.
Southern Company Gas also has five liquefied natural gas (LNG)four LNG plants located in Georgia New Jersey, and Tennessee with total LNG storage capacity of approximately 7.67.0 Bcf. In addition, Southern Company Gas owns onetwo propane storage facilityfacilities in Virginia, each with storage capacity of approximately 0.3 Bcf. The LNG plants and propane storage facility are used by Southern Company Gas' gas distribution operations segment to supplement natural gas supply during peak usage periods.
Storage Assets – All Other– Southern Company Gas subsidiaries own three high-deliverability natural gas storage and hub facilities that are operated by the gas midstream operations segment. Jefferson Island Storage & Hub, LLC operates a storage facility in Louisiana consisting of two salt dome gas storage caverns. Golden Triangle Storage, Inc. operates a storage facility in Texas consisting of two salt dome caverns. Central Valley Gas Storage, LLC operates a depleted field storage facility in California. In addition, Southern Company Gas has a LNG facility in Alabama that produces LNG for Pivotal LNG, Inc. to support its business of selling LNG as a substitute fuel in various markets.

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All Other
In August 2017, in connection with an ongoing integrity project into the salt dome gas storage caverns in Louisiana, updated seismic mapping indicated the proximitySeptember 2022, certain affiliates of one of the caverns to the edge of the salt dome may be less than the required minimum and could result in Southern Company Gas retiringentered into agreements to sell two natural gas storage facilities located in California and Texas. The sale of the cavern early.Texas facility was completed in November 2022 and the sale of the California facility was completed on September 22, 2023. See FUTURE EARNINGS POTENTIAL – "Other Matters" and Note 315 to the financial statements of Southernunder "Southern Company and Southern Company GasGas" in Item 8 herein for additional information.
Jointly-Owned Properties
Southern Company Gas' gas midstream operationspipeline investments segment has a 50% undivided ownership interest in a 115-mile pipeline facility in northwest Georgia that was placed in service on August 1, 2017.Georgia. Southern Company Gas also has an agreement to lease its 50% undivided ownership in the pipeline facility. See Note 45 to the financial statements of Southern Company and Southern Company Gasunder "Joint Ownership Agreements" in Item 8 herein for additional information.


Item 3.LEGAL PROCEEDINGS
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Item 3.LEGAL PROCEEDINGS
See Note 3 to the financial statements of each registrant in Item 8 herein for descriptions of legal and administrative proceedings discussed therein. The Registrants' threshold for disclosing material environmental legal proceedings involving a governmental authority where potential monetary sanctions are involved is $1 million.
Item 4.MINE SAFETY DISCLOSURES
Item 4.MINE SAFETY DISCLOSURES
Not applicable.

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INFORMATION ABOUT OUR EXECUTIVE OFFICERS OF SOUTHERN COMPANY
(Identification of executive officers of Southern Company is inserted in Part I in accordance with Regulation S-K, Item 401(b), Instruction 3.)401) The ages of the officers set forth below are as of December 31, 2017.2023.
Thomas A. FanningChristopher C. Womack
Chairman, President, and Chief Executive Officer
Age 6065
ElectedFirst elected in 2003.2008. President since March 2023, Chief Executive Officer since May 2023, and Chairman since December 2023. Previously served as Chairman and Chief Executive Officer since December 2010of Georgia Power from June 2021 to March 2023, President of Georgia Power from November 2020 to March 2023, and Executive Vice President and President since August 2010.of External Affairs of Southern Company from January 2009 to October 2020.
Art P. BeattieDaniel S. Tucker
Executive Vice President and Chief Financial Officer
Age 6353
ElectedFirst elected in 2010.2021. Executive Vice President and Chief Financial Officer since August 2010.
W. Paul Bowers
Executive Vice President
Age 61
Elected in 2001. Executive Vice President since February 2008 and Chief Executive Officer, President, and Director of Georgia Power since January 2011. Chairman of Georgia Power's Board of Directors since May 2014.
S. W. Connally, Jr.
Chairman, President, and Chief Executive Officer of Gulf Power
Age 48
Elected in 2012. Elected Chairman in July 2015 and President, Chief Executive Officer, and Director of Gulf Power since July 2012.
Mark A. Crosswhite
Executive Vice President
Age 55
Elected in 2010. Executive Vice President since July 2012 and President, Chief Executive Officer, and Director of Alabama Power since March 2014. Chairman of Alabama Power's Board of Directors since May 2014.September 2021. Previously served as Executive Vice President, and Chief Operating Officer of Southern Company from July 2012 through February 2014.
Andrew W. Evans
Executive Vice President
Age 51
Elected in July 2016. Executive Vice President since July 2016. President of Southern Company Gas since May 2015 and Chief ExecutiveFinancial Officer, and ChairmanTreasurer of Southern Company Gas' Board of Directors sinceGeorgia Power from January 2016. Previously served as Chief Operating Officer of Southern Company Gas from May 2015 through December 20152021 to September 2021, and Executive Vice President and Chief Financial Officer of Southern Company Gas from May 2006 through May 2015.January 2019 to January 2021.
Kimberly S. GreeneBryan D. Anderson
Executive Vice President
Age 5157
ElectedFirst elected in 2013.2020. Executive Vice President and Chief Operating OfficerPresident of External Affairs since March 2014. DirectorJanuary 2021. Executive Vice President of Southern Company GasSCS since July 2016.November 2020. Previously served as Senior Vice President of SCS with responsibility for governmental affairs from January 2015 to November 2020.
Stanley W. Connally, Jr.
Executive Vice President
Age 54
First elected in 2012. Executive Vice President since April 2021. Chairman, President, and Chief Executive Officer of SCS since April 2021. Previously served as Executive Vice President for Operations of SCS from June 2018 to April 20132021.
Christopher Cummiskey
Executive Vice President
Age 49
First elected in 2021. Executive Vice President since January 2021. Chairman of Southern Power since February 2021 and Executive Vice President of SCS, Chief Executive Officer of Southern Power, and President and Chief Executive Officer of Southern PowerSecure Holdings, Inc. and Southern Holdings since July 2020. Previously served as Executive Vice President, External Affairs of Georgia Power from May 2015 to February 2014. Before rejoining Southern Company, Ms. Greene served at Tennessee Valley Authority as June 2020.
Martin B. Davis
Executive Vice President and Chief GenerationInformation Officer
Age 60
First elected in 2021. Executive Vice President since April 2021. Chief Information Officer and Executive Vice President of SCS since July 2015. Previously served as Vice President from 2011July 2015 through April 2021.
Kimberly S. Greene
Chairman, President, and Chief Executive Officer of Georgia Power
Age 57
First elected in 2013. Chairman, President, and Chief Executive Officer of Georgia Power since April 2023. Previously served as Chairman, President, and Chief Executive Officer of Southern Company Gas from June 2018 to March 2023.
James Y. Kerr II
Executive Vice President and General Counsel
Age 53
Elected in 2014. Also serves as Chief Compliance Officer. Before joining Southern Company, Mr. Kerr was a partner with McGuireWoods LLP and a senior advisor at McGuireWoods Consulting LLC from 2008 through February 2014.
Stephen E. Kuczynski
Chairman, President, and Chief Executive Officer of Southern Company Gas
Age 59
First elected in 2014. Chairman, President, and Chief Executive Officer of Southern Company Gas since April 2023. Previously served as Executive Vice President, Chief Legal Officer, and Chief Compliance Officer of Southern Company from March 2014 to March 2023.
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Stephen E. Kuczynski
Chairman and Chief Executive Officer of Southern Nuclear
Age 5561
ElectedFirst elected in 2011. Chairman President, and Chief Executive Officer of Southern Nuclear since July 2011. Previously served as President of Southern Nuclear from July 2011 through March 2023.

J. Jeffrey Peoples
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Mark S. Lantrip
Executive Vice President
Age 63
Elected in 2014. Chairman, President, and Chief Executive Officer of SCSAlabama Power
Age 64
First elected in 2023. Chairman, President, and Chief Executive Officer of Alabama Power since March 2014.January 2023. Previously served as TreasurerExecutive Vice President of Customer and Employee Services of Alabama Power from June 2020 to January 2023, Senior Vice President of Employee Services and Labor Relations of Alabama Power from June 2018 to June 2020, and Executive Vice President and Chief Administrative Officer of Southern Company Gas and President of AGL Services Company from September 2018 to June 2020.
Sterling A. Spainhour
Executive Vice President and Chief Legal Officer
Age 55
First elected in 2023. Executive Vice President and Chief Legal Officer since April 2023. Previously served as Chief Compliance Officer of Southern Company from October 2007April 2023 to February 2014January 2024, Senior Vice President, General Counsel, Corporate Secretary, and ExecutiveChief Compliance Officer of Georgia Power from June 2020 to March 2023, Senior Vice President and General Counsel – East of SCS from November 2010July 2020 to March 2014.
Nancy E. Sykes
Executive2023, and Senior Vice President and General Counsel of SCS
Age 49
Elected in 2016. Also serves as Chief Human Resources Officer of SCS. Before joining Southern Company, Ms. Sykes served as vice president and chief human resources officer at United States Steel Corporation from May 2015December 2016 to November 2016. Previously served as Vice President, Human Resources Asia-Pacific at Goodyear Tire and Rubber Company from October 2012 until May 2015.July 2020.
Anthony L. Wilson
Chairman, President, and Chief Executive Officer of Mississippi Power
Age 5359
ElectedFirst elected in 2015. President of Mississippi Power since October 2015 and Chief Executive Officer and Director since January 2016. Chairman of Mississippi Power's Board of Directors since August 2016. Previously served as Executive Vice President of Mississippi Power from May 2015 to October 2015 and Executive Vice President of Georgia Power from January 2012 to May 2015.
Christopher C. Womack
Executive Vice President
Age 59
Elected in 2008. Executive Vice President and President of External Affairs since January 2009.
The officers of Southern Company wereEach officer listed above was elected at the firstannual meeting (or by written consent in lieu of the annual meeting) of the board of directors followingof the lastapplicable company, to serve until the next such annual meeting of stockholders held on May 24, 2017, for a term of one year or until their successors arehis or her successor is elected and have qualified.


qualified, except for Mr. Womack who was elected as Chairman on December 11, 2023.
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EXECUTIVE OFFICERS OF ALABAMA POWER
(Identification of executive officers of Alabama Power is inserted in Part I in accordance with Regulation S-K, Item 401(b), Instruction 3.) The ages of the officers set forth below are as of December 31, 2017.
Mark A. Crosswhite
Chairman, President, and Chief Executive Officer
Age 55
Elected in 2014. President, Chief Executive Officer, and Director since March 1, 2014. Chairman since May 2014. Previously served as Executive Vice President and Chief Operating Officer of Southern Company from July 2012 through February 2014.
Greg J. Barker
Executive Vice President
Age 54
Elected in 2016. Executive Vice President for Customer Services since February 2016. Previously served as Senior Vice President of Marketing and Economic Development from April 2012 to February 2016.
Philip C. Raymond
Executive Vice President, Chief Financial Officer, and Treasurer
Age 58
Elected in 2010. Executive Vice President, Chief Financial Officer, and Treasurer since August 2010.
Zeke W. Smith
Executive Vice President
Age 58
Elected in 2010. Executive Vice President of External Affairs since November 2010.
James P. Heilbron
Senior Vice President and Senior Production Officer
Age 46
Elected in 2013. Senior Vice President and Senior Production Officer since March 2013. Previously served as Senior Vice President and Senior Production Officer of Southern Power Company from July 2010 to February 2013.
R. Scott Moore
Senior Vice President
Age 50
Elected in 2017. Senior Vice President of Power Delivery since May 2017. Previously served as Vice President of Transmission from August 2012 to May 2017.
The officers of Alabama Power were elected at the meeting of the directors held on April 28, 2017 for a term of one year or until their successors are elected and have qualified, except for Mr. Moore, whose election as Senior Vice President was effective May 20, 2017.

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EXECUTIVE OFFICERS OF MISSISSIPPI POWER
(Identification of executive officers of Mississippi Power is inserted in Part I in accordance with Regulation S-K, Item 401(b), Instruction 3.) The ages of the officers set forth below are as of December 31, 2017.
Anthony L. Wilson
Chairman, President, and Chief Executive Officer
Age 53
Elected in 2015. President since October 2015 and Chief Executive Officer and Director since January 2016. Chairman of Mississippi Power's Board since August 2016. Previously served as Executive Vice President from May 2015 to October 2015 and Executive Vice President of Georgia Power from January 2012 to May 2015.
John W. Atherton
Vice President
Age 57
Elected in 2004. Vice President of Corporate Services and Community Relations since October 2012.
A. Nicole Faulk
Vice President
Age 44
Elected in 2015. Vice President of Customer Services Organization effective April 2015. Previously served as Region Vice President for the West Region of Georgia Power from March 2015 through April 2015 and Region Manager for the Metro West Region of Georgia Power from December 2011 to March 2015.
Moses H. Feagin
Vice President, Treasurer, and Chief Financial Officer
Age 53
Elected in 2010. Vice President, Treasurer, and Chief Financial Officer since August 2010.
R. Allen Reaves, Jr.
Vice President
Age 58
Elected in 2010. Vice President and Senior Production Officer since August 2010.
Billy F. Thornton
Vice President
Age 57
Elected in 2012. Vice President of External Affairs since October 2012.
The officers of Mississippi Power were elected at the meeting of the directors held on May 1, 2017 for a term of one year or until their successors are elected and have qualified.

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PART II


Item 5.MARKET FOR REGISTRANTS' COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
Item 5.MARKET FOR REGISTRANTS' COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
(a)(1) The common stock of Southern Company is listed and traded on the NYSE.NYSE under the ticker symbol SO. The common stock is also traded on regional exchanges across the U.S. The high and low stock prices as reported on the NYSE for each quarter of the past two years were as follows:
  High Low
2017    
First Quarter $51.47
 $47.57
Second Quarter 51.97
 47.87
Third Quarter 50.80
 46.71
Fourth Quarter 53.51
 47.92
2016    
First Quarter $51.73
 $46.00
Second Quarter 53.64
 47.62
Third Quarter 54.64
 50.00
Fourth Quarter 52.23
 46.20
There is no market for the other registrants'Registrants' common stock, all of which is owned by Southern Company.
(a)(2) Number of Southern Company's common stockholders of record at January 31, 2018: 120,4132024: 95,412
EachSouthern Company has paid dividends on its common stock since 1948. Dividends paid per share of the other registrants have one common stockholder,stock were $2.78 in 2023 and $2.70 in 2022. In January 2024, Southern Company.
TableCompany declared a quarterly dividend of ContentsIndex to Financial Statements

(a)(3)70 cents per share. Dividends on each registrant'sSouthern Company's common stock are payable at the discretion of their respective boardSouthern Company's Board of directorsDirectors and depend upon earnings, financial condition, and other factors. The dividends on common stock declared by Southern Company, the traditional electric operating companies (other than Mississippi Power), Southern Power Company, and Southern Company Gas to their stockholder(s) for the past two years are set forth below. No dividends were declared by Mississippi Power on its common stock in 2016 or 2017. Southern Company Gas' dividends are only shown for periods subsequentSee Note 8 to the Merger.financial statements under "Dividend Restrictions" in Item 8 herein for additional information.
Registrant Quarter 2017 2016
    (in thousands)
Southern Company First $555,791
 $496,718
  Second 578,525
 526,267
  Third 581,501
 529,876
  Fourth 584,015
 551,110
Alabama Power First 178,507
 191,206
  Second 178,507
 191,206
  Third 178,507
 191,206
  Fourth 178,507
 191,206
Georgia Power First 320,242
 326,269
  Second 320,242
 326,269
  Third 320,242
 326,269
  Fourth 320,242
 326,269
Gulf Power First 31,250
 30,017
  Second 31,250
 30,017
  Third 31,250
 30,017
  Fourth 71,250
 30,017
Southern Power Company First 79,211
 68,082
  Second 79,211
 68,082
  Third 79,211
 68,082
  Fourth 79,211
 68,082
Southern Company Gas First 110,641
 
  Second 110,641
 
  Third 110,641
 62,750
  Fourth 110,641
 62,750
The dividend paid per share of Southern Company's common stock was 56.00¢ for the first quarter 2017 and 58.00¢ each for the second, third, and fourth quarters of 2017. In 2016, Southern Company paid a dividend per share of 54.25¢ for the first quarter and 56.00¢ each for the second, third, and fourth quarters.
The traditional electric operating companies and Southern Power Company can only pay dividends to Southern Company out of retained earnings or paid-in-capital. The authorityEach of the natural gas distribution utilities to pay dividends toother Registrants have one common stockholder, Southern Company Gas is subject to regulation. By regulation, Nicor Gas is restricted, to the extent of its retained earnings balance, in the amount it can dividend or loan to affiliates. Additionally, Elizabethtown Gas is restricted by its policy, as established by the New Jersey Board of Public Utilities, to 70% of its quarterly net income it can dividend to Southern Company Gas. Also, as stipulated in the New Jersey Board of Public Utilities' order approving the Merger, Southern Company Gas is prohibited from paying dividends to its parent company, Southern Company, if Southern Company Gas' senior unsecured debt rating falls below investment grade.Company.
(a)(4)(3) Securities authorized for issuance under equity compensation plans.
See Part III, Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.
(b) Use of Proceeds
Not applicable.
(c) Issuer Purchases of Equity Securities
None.

Item 6.RESERVED
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Item 6.SELECTED FINANCIAL DATA
Item 7.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
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Combined Management's Discussion and Analysis of Financial Condition and Results of Operations
Page
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Item 7.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
This section generally discusses 2023 and 2022 items and year-to-year comparisons between 2023 and 2022. Discussions of 2021 items and year-to-year comparisons between 2022 and 2021 that are not included in this Annual Report on Form 10-K can be found in Item 7 of each Registrant's Annual Report on Form 10-K for the year ended December 31, 2022, which was filed with the SEC on February 15, 2023. The following Management's Discussion and Analysis of Financial Condition and Results of Operations is a combined presentation; however, information contained herein relating to any individual Registrant is filed by such Registrant on its own behalf and each Registrant makes no representation as to information related to the other Registrants.
Page
Item 7A.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
See MANAGEMENT'S DISCUSSION AND ANALYSIS – FINANCIAL CONDITION AND LIQUIDITY – "Market Price Risk" of each of the registrants in Item 7 herein and Note 1 of each ofto the registrant's financial statements under "Financial Instruments" in Item 8 herein. Also see Notes 13 and 14 to the financial statements in Item 8 herein.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
OVERVIEW
Business Activities
Southern Company is a holding company that owns all of the common stock of three traditional electric operating companies, Southern Power, and Southern Company Gas and owns other direct and indirect subsidiaries. The primary businesses of the Southern Company system are electricity sales by the traditional electric operating companies and Southern Power and the distribution of natural gas by Southern Company Gas. Southern Company's reportable segments are the sale of electricity by the traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. See Note 16 to the financial statements for additional information.
The traditional electric operating companies – Alabama Power, Georgia Power, and Mississippi Power – are vertically integrated utilities providing electric service to retail customers in three Southeastern states in addition to wholesale customers in the Southeast.
Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Power continually seeks opportunities to execute its strategy to create value through various transactions including acquisitions, dispositions, and sales of partnership interests, development and construction of new generating facilities, and entry into PPAs primarily with investor-owned utilities, IPPs, municipalities, electric cooperatives, and other load-serving entities, as well as commercial and industrial customers. In general, Southern Power commits to the construction or acquisition of new generating capacity only after entering into or assuming long-term PPAs for the new facilities.
Southern Company Gas is an energy services holding company whose primary business is the distribution of natural gas. Southern Company Gas owns natural gas distribution utilities in four states – Illinois, Georgia, Virginia, and Tennessee – and is also involved in several other complementary businesses. Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services, which includes SouthStar, a Marketer and provider of energy-related products and services to natural gas markets – and one non-reportable segment, all other. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' reportable segments also included wholesale gas services. See Notes 107, 15, and 16 to the financial statements for additional information.
Southern Company's other business activities include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications. Management continues to evaluate the contribution of each of these activities to total shareholder return and may pursue acquisitions, dispositions, and other strategic ventures or investments accordingly.
See FUTURE EARNINGS POTENTIAL herein for a discussion of many factors that could impact the Registrants' future results of operations, financial condition, and liquidity.
Recent Developments
Alabama Power
On March 24, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with the acquisition of the Central Alabama Generating Station. The filing reflected an annual increase in retail revenues of $78 million, or 1.1%, effective with June 2023 billings. Through May 2023, Alabama Power recovered substantially all costs associated with the Central Alabama Generating Station through Rate RSE, offset by revenues from a power sales agreement. On May 24, 2023, the Central Alabama Generating Station was placed into retail service. On November 1, 2023, Alabama Power placed Plant Barry Unit 8 in service. On December 1, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with Plant Barry Unit 8. The filing reflected an annual increase in retail revenues of $91 million, or 1.4%, effective with January 2024 billings.
On June 14, 2023, the Alabama PSC issued an order approving modifications to Alabama Power's Renewable Generation Certificate. The modifications authorized Alabama Power to procure an additional 2,400 MWs of renewable capacity and energy by June 14, 2029 and to market the related energy and environmental attributes to customers and other third parties. The modifications also increased the size of allowable renewable projects from 80 MWs to 200 MWs and increased the annual approval limit from 160 MWs to 400 MWs.
On July 11, 2023, the Alabama PSC issued an order authorizing Alabama Power to expand the existing authority of its reliability reserve to include certain production-related expenses that are intended to maintain reliability in between scheduled generating unit maintenance outages.
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On August 18, 2023, Alabama Power notified the Alabama PSC of its intent to use a portion of its reliability reserve balance in 2023. During the fourth quarter 2023, Alabama Power used $75 million of the reliability reserve for reliability-related transmission, distribution, and generation expenses and nuclear production-related expenses. At December 31, 2023, Alabama Power accrued $52 million to its reliability reserve.
On October 3, 2023, the Alabama PSC issued an order modifying its December 2022 order related to excess federal accumulated deferred income taxes and authorizing Alabama Power to (i) flow back in 2023 approximately $24 million of certain federal excess accumulated deferred income taxes resulting from the Tax Cuts and Jobs Act of 2017 and (ii) make available any remaining balance of excess accumulated deferred income taxes at the end of 2023 for the benefit of customers in 2024 and/or 2025. At December 31, 2023, the remaining balance was $81 million, of which approximately $67 million and $14 million will flow back in 2024 and 2025, respectively, for the benefit of customers.
On November 9, 2023, the Alabama PSC approved a decrease to Rate ECR of approximately $126 million annually, effective with December 2023 billings.
On December 1, 2023, Alabama Power submitted calculations to the Alabama PSC for Rate CNP Compliance for 2024, which resulted in an annual revenue decrease of approximately $23 million, or 0.3%, effective with January 2024 billings.
For the year ended December 31, 2023, Alabama Power's weighted common equity return exceeded 6.15%, resulting in Alabama Power establishing a current regulatory liability of $15 million for Rate RSE refunds, which will be refunded to customers through bill credits in April 2024.
See Note 2 to the financial statements under "Alabama Power" for additional information.
Georgia Power
Plant Vogtle Units 3 and 4 Construction and Start-Up Status
Georgia Power placed Plant Vogtle Unit 3 in service on July 31, 2023 and continues construction on Plant Vogtle Unit 4 (each with electric generating capacity of approximately 1,100 MWs), in which it holds a 45.7% ownership interest. Georgia Power's share of the total project capital cost forecast to complete Plant Vogtle Units 3 and 4, including contingency, through the second quarter 2024 is $10.8 billion.
Hot functional testing for Unit 4 was completed on May 1, 2023. On July 20, 2023, Southern Nuclear announced that all Unit 4 ITAACs had been submitted to the NRC, and, on July 28, 2023, the NRC published its 103(g) finding that the accepted criteria in the combined license for Unit 4 had been met, which allowed nuclear fuel to be loaded and start-up testing to begin. Fuel load for Unit 4 was completed on August 19, 2023. On October 6, 2023, Georgia Power announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified a motor fault in one of four reactor coolant pumps (RCPs). This RCP was replaced with an on-site spare RCP from inventory.
On February 1, 2024, Georgia Power announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified, and has remediated, vibrations associated with certain piping within the cooling system. Considering the remaining pre-operational testing, Unit 4 is projected to be placed in service during the second quarter 2024. On February 14, 2024, Unit 4 achieved self-sustaining nuclear fission, commonly referred to as initial criticality. The projected schedule for Unit 4 significantly depends on the progression of start-up and pre-operational testing, which may be impacted by equipment or other operational failures. In addition, any findings related to the root cause of the motor fault on the single Unit 4 RCP could require engineering changes or remediation related to the other seven Unit 3 and Unit 4 RCPs. Any further delays could result in a later in-service date and cost increases.
As of December 31, 2023, based on completion of construction work and the assessment of start-up and pre-operational testing remaining, Southern Nuclear has an estimated $36 million for construction contingency remaining in the estimate to complete. This contingency is projected to be allocated in the future to address any further Unit 4 schedule extensions or remediation of other issues discovered during start-up testing.
In September 2022, Georgia Power and MEAG Power reached an agreement to resolve a dispute regarding the cost-sharing and tender provisions of the Global Amendments (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"). Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project capital cost forecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the current project capital cost forecast, with no further adjustment for force majeure costs.
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On October 5, 2023 and October 17, 2023, Georgia Power reached agreements with OPC and Dalton, respectively, to resolve its respective dispute with each of OPC and Dalton regarding the cost-sharing and tender provisions of the Global Amendments. Under the terms of the agreements with OPC and Dalton, among other items, (i) each of OPC and Dalton retracted its exercise of the tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4, (ii) Georgia Power made payments immediately after execution of the agreements of $308 million and $17 million to OPC and Dalton, respectively, representing payment for a portion of each of OPC's and Dalton's costs of construction for Plant Vogtle Units 3 and 4 previously incurred, (iii) Georgia Power will pay a portion of each of OPC's and Dalton's further costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will be in an aggregate amount of approximately $105 million and $6 million for OPC and Dalton, respectively, based on the current project capital cost forecast, and (iv) Georgia Power will pay 66% of each of OPC's and Dalton's costs of construction with respect to any amounts above the current project capital cost forecast, with no further adjustment for force majeure costs.
Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing provisions of the Global Amendments, including the settlement with MEAG Power. Based on the current project capital cost forecast and the settlements with OPC and Dalton described above, Georgia Power recorded a pre-tax charge to income of approximately $160 million ($120 million after tax) in the third quarter 2023. These charges are included in the total project capital cost forecast and will not be recovered from retail customers.
The ultimate impact of these matters on the construction schedule for Plant Vogtle Unit 4 and project capital cost forecast for Plant Vogtle Units 3 and 4 cannot be determined at this time. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Plant Vogtle Units 3 and 4 Rate and Prudency Proceedings
In compliance with a Georgia PSC order approved in 2021, Georgia Power increased annual retail base rates by $318 million effective August 1, 2023 based on the in-service date of July 31, 2023 for Unit 3.
On December 19, 2023, the Georgia PSC voted to approve the application to adjust rates to include reasonable and prudent Plant Vogtle Units 3 and 4 costs (Application) as modified by the related stipulated agreement (Prudency Stipulation) among Georgia Power, the staff of the Georgia PSC, and certain intervenors.
Under the terms of the approved Prudency Stipulation, Georgia Power will recover $7.562 billion in total construction and capital costs and associated retail rate base items of $1.02 billion, which includes AFUDC financing costs above $4.418 billion (the Georgia PSC-certified amount) up to $7.562 billion. Georgia Power will also recover projected operations and maintenance expenses, depreciation expense, nuclear decommissioning accruals, and property taxes, net of projected PTCs. After considering construction and capital costs already in retail base rates of $2.1 billion and $362 million of associated retail rate base items (approved by the Georgia PSC in 2021) and upon achieving commercial operation of Unit 4, Georgia Power will include in retail rate base the remaining $5.462 billion of construction and capital costs as well as $656 million of associated retail rate base items.
Under the Prudency Stipulation, if commercial operation for Unit 4 is not achieved by March 31, 2024, Georgia Power's ROE used to determine the NCCR tariff and calculate AFUDC will be reduced to zero, which will result in an estimated negative impact to earnings of approximately $30 million per month until the month following the date commercial operation for Unit 4 is achieved. The ultimate outcome of this matter cannot be determined at this time.
Annual retail base revenues will increase approximately $729 million and the average retail base rates will be adjusted by approximately 5% (net of the elimination of the NCCR tariff described above) effective the first day of the month after Unit 4 achieves commercial operation.
The approval of the Application and the Prudency Stipulation resolves all issues for determination by the Georgia PSC regarding the reasonableness, prudence, and cost recovery for the remaining Plant Vogtle Units 3 and 4 construction and capital costs not already in retail base rates.
As a result of the Georgia PSC's approval of the Prudency Stipulation, Georgia Power recorded a pre-tax credit to income of approximately $228 million ($170 million after tax) in the fourth quarter 2023 to recognize CWIP costs previously charged to income, which are now recoverable through retail rates. Associated AFUDC on these costs was also recognized.
See Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Regulatory Matters" for additional information.
Rate Plans
On November 16, 2023, in accordance with the terms of the 2022 ARP, the Georgia PSC approved tariff adjustments effective January 1, 2024 that resulted in a net increase in rates of $191 million.
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Georgia Power expects to submit a compliance filing in the fourth quarter 2024 to request tariff adjustments approved pursuant to the 2022 ARP effective January 1, 2025. The ultimate outcome of this matter cannot be determined at this time.
See Note 2 to the financial statements under "Georgia Power – Rate Plans – 2022 ARP" for additional information.
Fuel Cost Recovery
On May 16, 2023, the Georgia PSC approved a stipulation agreement between Georgia Power and the staff of the Georgia PSC to increase annual fuel billings by 54%, or approximately $1.1 billion, effective June 1, 2023. The increase reflects a three-year recovery period for $2.2 billion of Georgia Power's under recovered fuel balance at May 31, 2023. Changes in fuel rates have no significant effect on Southern Company's or Georgia Power's net income but do impact the related operating cash flows. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Integrated Resource Plans
On October 27, 2023, Georgia Power filed an updated IRP (2023 IRP Update) with the Georgia PSC, which sets forth a plan to support the recent increase in the state of Georgia's projected energy needs since the 2022 IRP. Georgia Power expects the Georgia PSC to render a final decision on the 2023 IRP Update on April 16, 2024. The ultimate outcome of this matter cannot be determined at this time. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Mississippi Power
On October 27, 2023, the FERC approved a settlement agreement filed by Mississippi Power and Cooperative Energy on July 31, 2023 related to Mississippi Power's July 2022 request for a $23 million increase in annual wholesale base revenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and a refund to customers of approximately $6 million primarily related to the difference between the approved rates and interim rates.
In October 2023, Mississippi Power signed an affiliate PPA with Georgia Power for 750 MWs of capacity, which began January 1, 2024 and will continue through December 2028. In order to fulfill this PPA and serve the interests of customers, Mississippi Power now expects electric generating units identified in its 2021 IRP to remain in service beyond the previously indicated dates. Mississippi Power is expected to file its next IRP in April 2024 in accordance with the rules and orders of the Mississippi PSC. The ultimate outcome of this matter cannot be determined at this time.
On February 6, 2024, the Mississippi PSC approved Mississippi Power's request to increase retail fuel revenues by $18 million annually effective with the first billing cycle of March 2024.
On February 12, 2024, Mississippi Power submitted its annual ECO Plan filing to the Mississippi PSC, which requested a $9 million annual increase in revenues. The ultimate outcome of this matter cannot be determined at this time.
See Note 2 to the financial statements under "Mississippi Power" for additional information.
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Southern Power
On September 20, 2023, Southern Power acquired 100% of the membership interests in the 200-MW Millers Branch solar project located in Haskell County, Texas from EDF Renewables Development, Inc. and is continuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to occur in the fourth quarter 2025. The project includes an option to expand capacity up to an additional 300 MWs. Subsequent to December 31, 2023, Southern Power committed to expand the construction of the facility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the second quarter 2026.
On September 22, 2023, Southern Power acquired 100% of the membership interests in the 150-MW South Cheyenne solar project located in Laramie County, Wyoming from Hanwha Q Cells USA Corp. and is continuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to occur in the second quarter 2024.
The ultimate outcome of these matters cannot be determined at this time.
Southern Power calculates an investment coverage ratio for its generating assets, including those owned with various partners, based on the ratio of investment under contract to total investment using the respective facilities' net book value (or expected in-service value for facilities under construction) as the investment amount. With the inclusion of investments associated with facilities under construction, as well as other capacity and energy contracts, Southern Power's average investment coverage ratio at December 31, 2023 was 97% through 2028 and 89% through 2033, with an average remaining contract duration of approximately 12 years.
See Note 15 to the financial statements under "Southern Power" for additional information.
Southern Company Gas
On June 15, 2023, the Illinois Commission concluded its review of the Qualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the second quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an $8 million reduction to revenues and $30 million in estimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a rehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and an equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to be completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the fourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be postponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined in the Illinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to the Illinois Commission's rate case ruling.
Any further cost disallowances by the Illinois Commission in the pending cases could be material to the financial statements of Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
On December 19, 2023, the Georgia PSC approved Atlanta Gas Light's annual GRAM filing, which resulted in an annual base rate increase of $53 million effective January 1, 2024.
On February 1, 2024, Atlanta Gas Light filed its triennial Integrated Capacity and Delivery Plan (i-CDP) with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2025 through 2034), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected
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capital investments totaling approximately $0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order on this matter in the third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
On August 28, 2023, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for a $48 million increase in annual base rate revenues based on a ROE of 9.70% and an equity ratio of 49.06%. Interim rates became effective as of January 1, 2023, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $69 million. Refunds to customers related to the difference between the approved rates effective September 1, 2023 and the interim rates were completed during the fourth quarter 2023.
On February 9, 2024, Virginia Natural Gas filed with the Virginia Commission a request to extend the existing SAVE program through 2029. The request includes investments of $70 million in each year from 2025 through 2029, with a potential variance of up to $5 million allowed for the program, for a maximum total investment over the five-year extension (2025 through 2029) of $355 million. Virginia Natural Gas expects the Virginia Commission to issue a final order on this matter in the second quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Key Performance Indicators
In striving to achieve attractive risk-adjusted returns while providing cost-effective energy to approximately 8.9 million electric and gas utility customers collectively, the traditional electric operating companies and Southern Company Gas continue to focus on several key performance indicators. These indicators include, but are not limited to, customer satisfaction, plant availability, electric and natural gas system reliability, and execution of major construction projects. In addition, Southern Company and the Subsidiary Registrants focus on earnings per share (EPS) and net income, respectively, as a key performance indicator. See RESULTS OF OPERATIONS herein for information on the Registrants' financial performance.
The financial success of the traditional electric operating companies and Southern Company Gas is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. The traditional electric operating companies use customer satisfaction surveys to evaluate their results and generally target the top quartile of these surveys in measuring performance. Reliability indicators are also used to evaluate results. See Note 2 to the financial statements under "Alabama Power – Rate RSE" and "Mississippi Power – Performance Evaluation Plan" for additional information on Alabama Power's Rate RSE and Mississippi Power's PEP rate plan, respectively, both of which contain mechanisms that directly tie customer service indicators to the allowed equity return.
Southern Company Gas also continues to focus on several operating metrics, including Heating Degree Days, customer count, and volumes of natural gas sold. Southern Company Gas measures weather and the effect on its business using Heating Degree Days. Generally, increased Heating Degree Days result in higher demand for natural gas on Southern Company Gas' distribution system. See RESULTS OF OPERATIONS – "Southern Company Gas" for additional information on Southern Company Gas' operating metrics.
Southern Power continues to focus on several key performance indicators, including, but not limited to, the equivalent forced outage rate and contract availability to evaluate operating results and help ensure its ability to meet its contractual commitments to customers.
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RESULTS OF OPERATIONS
Southern Company
Consolidated net income attributable to Southern Company was $4.0 billion in 2023, an increase of $452 million, or 12.8%, from 2022. The increase was primarily due to lower non-fuel operations and maintenance costs, an increase in retail electric revenues associated with rates and pricing, a decrease in income tax expense, a decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, an increase in other revenues, an increase in natural gas revenues from rate increases and continued infrastructure replacement, and a goodwill impairment charge in 2022 at PowerSecure, partially offset by higher depreciation and amortization, higher interest expense, and a decrease in retail electric revenues associated with milder weather in 2023 compared to 2022. See Notes 1 and 2 to the financial statements under "Goodwill and Other Intangible Assets" and "Georgia Power – Nuclear Construction," respectively, for additional information.
Basic EPS was $3.64 in 2023 and $3.28 in 2022. Diluted EPS, which factors in additional shares related to stock-based compensation, was $3.62 in 2023 and $3.26 in 2022. EPS for 2023 and 2022 was negatively impacted by $0.06 and $0.04 per share, respectively, as a result of increases in the average shares outstanding. See Note 8 to the financial statements under "Outstanding Classes of Capital Stock – Southern Company" for additional information.
Dividends paid per share of common stock were $2.78 in 2023 and $2.70 in 2022. In January 2024, Southern Company declared a quarterly dividend of 70 cents per share. For 2023, the dividend payout ratio was 76% compared to 82% for 2022.
Discussion of Southern Company's results of operations is divided into three parts – the Southern Company system's primary business of electricity sales, its gas business, and its other business activities.
20232022
(in millions)
Electricity business$3,994 $3,672 
Gas business615 572 
Other business activities(633)(720)
Net Income$3,976 $3,524 
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Electricity Business
Southern Company's electric utilities generate and sell electricity to retail and wholesale customers. A condensed statement of income for the electricity business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Electric operating revenues$19,998 $(2,875)
Fuel4,365 (2,470)
Purchased power883 (710)
Cost of other sales171 57 
Other operations and maintenance4,679 (550)
Depreciation and amortization3,865 836 
Taxes other than income taxes1,159 34 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total electric operating expenses15,054 (3,054)
Operating income4,944 179 
Allowance for equity funds used during construction247 37 
Interest expense, net of amounts capitalized1,274 207 
Other income (expense), net533 17 
Income taxes583 (265)
Net income3,867 291 
Less:
Dividends on preferred stock of subsidiaries (11)
Net loss attributable to noncontrolling interests(127)(20)
Net Income Attributable to Southern Company$3,994 $322 
Electric Operating Revenues
Electric operating revenues for 2023 were $20.0 billion, reflecting a $2.9 billion, or 12.6%, decrease from 2022. Details of electric operating revenues were as follows:
 20232022
 (in millions)
Retail electric — prior year$18,197 
Estimated change resulting from —
Rates and pricing437 
Sales decline(33)
Weather(229)
Fuel and other cost recovery(2,029)
Retail electric — current year$16,343 $18,197 
Wholesale electric revenues2,467 3,641 
Other electric revenues792 747 
Other revenues396 288 
Electric operating revenues$19,998 $22,873 
Retail electric revenues decreased $1.9 billion, or 10.2%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing in 2023 was primarily due to base tariff increases in accordance with Georgia Power's 2022 ARP, revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed
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retail ROE range, an increase in Rate CNP Compliance revenues at Alabama Power, and a lower Rate RSE customer refund accrual in 2023 compared to 2022 at Alabama Power, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in the revenues recognized under the NCCR tariff, both at Georgia Power.
Electric rates for the traditional electric operating companies include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of PPA costs, and do not affect net income. The traditional electric operating companies each have one or more regulatory mechanisms to recover other costs such as environmental and other compliance costs, storm damage, new plants, and PPA capacity costs.
See Note 2 to the financial statements under "Alabama Power" and "Georgia Power" for additional information. Also see "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Wholesale electric revenues from power sales were as follows:
20232022
 (in millions)
Capacity and other$630 $625 
Energy1,837 3,016
Total$2,467 $3,641 
In 2023, wholesale electric revenues decreased $1.2 billion, or 32.2%, as compared to 2022 primarily due to a decrease in energy revenues. Energy revenues decreased $884 million at Southern Power and $295 million at the traditional electric operating companies primarily due to fuel and purchased power price decreases compared to 2022. Also contributing to the Southern Power decrease was a net decrease in the volume of KWHs sold primarily associated with natural gas PPAs.
Wholesale electric revenues consist of revenues from PPAs and short-term opportunity sales. Wholesale electric revenues from PPAs (other than solar and wind PPAs) have both capacity and energy components. Capacity revenues generally represent the greatest contribution to net income and are designed to provide recovery of fixed costs plus a return on investment. Energy revenues will vary depending on fuel prices, the market prices of wholesale energy compared to the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Energy sales from solar and wind PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or through a fixed price related to the energy. As a result, the ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Wholesale electric revenues at Mississippi Power include FERC-regulated MRA sales under cost-based tariffs as well as market-based sales. Short-term opportunity sales are made at market-based rates that generally provide a margin above the Southern Company system's variable cost to produce the energy.
Other Electric Revenues
Other electric revenues increased $45 million, or 6.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $23 million in outdoor lighting sales at Georgia Power, $18 million resulting from receipts of liquidated damages associated with generation facility production guarantees and an arbitration award at Southern Power, $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs at Georgia Power, and $17 million in retail solar program fees at Georgia Power, partially offset by decreases of $25 million in cogeneration steam revenues associated with lower natural gas prices at Alabama Power and $14 million in rent revenues primarily at Alabama Power.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential47.1 (5.1)%(0.5)%
Commercial48.3 0.1 1.3 
Industrial48.6 (1.9)(1.9)
Other0.5 (7.2)(6.8)
Total retail144.5 (2.3)(0.4)%
Wholesale51.0 (9.4)
Total energy sales195.5 (4.3)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in the applicable service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Weather-adjusted retail energy sales decreased 587 million KWHs in 2023 as compared to 2022. Weather-adjusted residential KWH sales decreased 0.5% primarily due to decreased customer usage, partially offset by customer growth. Weather-adjusted commercial KWH sales increased 1.3% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 1.9% primarily due to decreases in the chemicals, forest products, and textiles sectors.
See "Electric Operating Revenues" above for a discussion of significant changes in wholesale revenues related to changes in price and KWH sales.
Other Revenues
Other revenues increased $108 million, or 37.5%, in 2023 as compared to 2022. The increase was primarily due to increases of $54 million in power delivery construction and maintenance projects at Georgia Power, $34 million in unregulated sales of products and services at Alabama Power, and $25 million associated with energy conservation projects at Georgia Power.
Fuel and Purchased Power Expenses
The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, the electric utilities purchase a portion of their electricity needs from the wholesale market.
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Details of the Southern Company system's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)(b)
184 186 
Total purchased power (in billions of KWHs)
18 25 
Sources of generation (percent)(a) —
Gas54 51 
Nuclear(b)
18 16 
Coal17 22 
Hydro3 
Wind, Solar, and Other8 
Cost of fuel, generated (in cents per net KWH) 
Gas(a)
2.77 5.29 
Nuclear(b)
0.76 0.72 
Coal4.33 3.67 
Average cost of fuel, generated (in cents per net KWH)(a)(b)
2.68 4.05 
Average cost of purchased power (in cents per net KWH)(c)
5.17 7.66 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(c)Average cost of purchased power includes fuel purchased by the Southern Company system for tolling agreements where power is generated by the provider.
In 2023, total fuel and purchased power expenses were $5.2 billion, a decrease of $3.2 billion, or 37.7%, as compared to 2022. The decrease was primarily the result of a $2.7 billion decrease in the average cost of fuel generated and purchased and a $513 million net decrease in the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions at the traditional electric operating companies are generally offset by fuel revenues and do not have a significant impact on net income. See Note 2 to the financial statements for additional information. Fuel expenses incurred under Southern Power's PPAs are generally the responsibility of the counterparties and do not significantly impact net income.
Fuel
In 2023, fuel expense was $4.4 billion, a decrease of $2.5 billion, or 36.1%, as compared to 2022. The decrease was primarily due to a 47.6% decrease in the average cost of natural gas per KWH generated and a 22.5% decrease in the volume of KWHs generated by coal, partially offset by an 18.2% decrease in the volume of KWHs generated by hydro, an 18.0% increase in the average cost of coal per KWH generated, a 10.8% increase in the volume of KWHs generated by nuclear, and a 6.9% increase in the volume of KWHs generated by natural gas.
Purchased Power
In 2023, purchased power expense was $883 million, a decrease of $710 million, or 44.6%, as compared to 2022. The decrease was primarily due to a 32.5% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 27.5% decrease in the volume of KWHs purchased.
Energy purchases will vary depending on demand for energy within the Southern Company system's electric service territory, the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, and the availability of the Southern Company system's generation.
Cost of Other Sales
Cost of other sales increased $57 million, or 50.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $40 million from unregulated power delivery construction and maintenance projects at Georgia Power and $20 million in expenses related to unregulated products and services at Alabama Power.
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Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $550 million, or 10.5%, in 2023 as compared to 2022. The decrease reflects a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred at Alabama Power. Excluding this decrease, there were decreases of $223 million in transmission and distribution expenses primarily related to line maintenance, $182 million in storm damage recovery as authorized in Georgia Power's 2022 ARP, $91 million in generation non-outage maintenance expenses and planned outages, and $50 million in employee compensation and benefit expenses, partially offset by an $86 million increase in technology infrastructure and application production costs and a $73 million increase in generation environmental projects primarily at Georgia Power. See Note 1 to the financial statements under "Storm Damage and Reliability Reserves" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $836 million, or 27.6%, in 2023 as compared to 2022. The increase was primarily due to increases of $541 million and $190 million resulting from higher depreciation rates at Alabama Power and Georgia Power, respectively, and $79 million from additional plant in service. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $34 million, or 3.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $62 million in property taxes primarily at Georgia Power resulting from an increase in the assessed value of property and $14 million in utility license taxes at Alabama Power, partially offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues at Georgia Power.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect Georgia Power's revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $37 million, or 17.6%, in 2023 as compared to 2022. The increase was primarily associated with an increase in capital expenditures subject to AFUDC at Georgia Power and an increase in capital expenditures related to hydro production and Plant Barry Unit 8 construction at Alabama Power. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $207 million, or 19.4%, in 2023 as compared to 2022. The increase reflects approximately $120 million related to higher interest rates and $96 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $17 million, or 3.3%, in 2023 as compared to 2022 primarily due to a $48 million decrease in charitable donations primarily at Georgia Power, a $15 million increase in interest income, and a $14 million decrease in non-operating benefit-related expenses at Alabama Power, partially offset by a $42 million decrease in non-service cost-related retirement benefits income and a $13 million decrease in customer charges related to contributions in aid of construction at Georgia Power. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $265 million, or 31.3%, in 2023 as compared to 2022. The decrease was primarily due to a $252 million increase in the flowback of certain excess deferred income taxes at Alabama Power, an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards at Georgia Power, generation of $35 million of advanced nuclear PTCs at Georgia Power, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward at Georgia Power, partially offset by a $145 million decrease in the flowback of certain excess deferred income taxes at Georgia Power that ended in 2022. See Note 10 to the financial statements for additional information.
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Net Loss Attributable to Noncontrolling Interests
Substantially all noncontrolling interests relate to renewable projects at Southern Power. Net loss attributable to noncontrolling interests increased $20 million, or 18.7%, in 2023 as compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to Southern Power's wind tax equity partners and $5 million in lower income allocations to Southern Power's equity partners, partially offset by $10 million in lower HLBV loss allocations to Southern Power's battery energy storage partners.
Gas Business
Southern Company Gas distributes natural gas through utilities in four states and is involved in several other complementary businesses including gas pipeline investments and gas marketing services.
A condensed statement of income for the gas business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Income taxes211 31 
Net income$615 $43 
During the period from November through March when natural gas usage and operating revenues are generally higher (Heating Season), more customers are connected to Southern Company Gas' distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively equally over any given year. Thus, operating results can vary significantly from quarter to quarter as a result of seasonality. For 2023, the percentage of operating revenues and net income generated during
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the Heating Season (January through March and November through December) were 67% and 73%, respectively. For 2022, the percentage of operating revenues and net income generated during the Heating Season were 67% and 66%, respectively.
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Southern Company Gas hedged its exposure to warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. The remaining impacts of weather on earnings were immaterial.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, the natural gas distribution utilities rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at the natural gas distribution utilities represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, in 2023 compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses increased $18 million, or 1.5%, in 2023 compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
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Depreciation and Amortization
Depreciation and amortization increased $23 million, or 4.1%, in 2023 compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes decreased $20 million, or 7.1%, in 2023 compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $47 million, or 17.9%, in 2023 compared to 2022. The increase reflects approximately $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
Income taxes increased $31 million, or 17.2%, in 2023 compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Other Business Activities
Southern Company's other business activities primarily include the parent company (which does not allocate operating expenses to business units); PowerSecure, which provides distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers; Southern Holdings, which invests in various projects; and Southern Linc, which provides digital wireless communications for use by the Southern Company system and also markets these services to the public and provides fiber optics services within the Southeast.
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A condensed statement of operations for Southern Company's other business activities follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$554 $110 
Cost of other sales355 87 
Other operations and maintenance175 (26)
Depreciation and amortization77 
Taxes other than income taxes4 — 
Impairment charges (119)
Gain on dispositions, net 14 
Total operating expenses611 (42)
Operating income (loss)(57)152 
Earnings from equity method investments5 
Interest expense863 171 
Other income (expense), net(16)39 
Income taxes (benefit)(298)(65)
Net loss$(633)$87 
Operating Revenues
Operating revenues for these other business activities increased $110 million, or 24.8%, in 2023 as compared to 2022 primarily due to increases of $92 million related to distributed infrastructure projects at PowerSecure and $24 million primarily related to sales associated with commercial customers at Southern Linc.
Cost of Other Sales
Cost of other sales for these other business activities increased $87 million, or 32.5%, in 2023 as compared to 2022 primarily due to increases of $58 million related to distributed infrastructure projects at PowerSecure and $23 million primarily related to sales associated with commercial customers at Southern Linc.
Other Operations and Maintenance
Other operations and maintenance expenses for these other business activities decreased $26 million, or 12.9%, in 2023 as compared to 2022 primarily due to a decrease at the parent company related to cost containment efforts and lower director compensation expenses.
Impairment Charges
In 2022, a goodwill impairment charge of $119 million was recorded at PowerSecure. See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information.
Gain on Dispositions, Net
In 2022, a $14 million gain was recorded at the parent company as a result of the early termination of the transition services agreement related to the 2019 sale of Gulf Power.
Interest Expense
Interest expense for these other business activities increased $171 million, or 24.7%, in 2023 as compared to 2022. The increase primarily results from parent company financing activities and includes approximately $112 million related to higher interest rates and $73 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
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Other Income (Expense), Net
Other income (expense), net for these other business activities increased $39 million, or 70.9%, in 2023 as compared to 2022 primarily due to a $29 million decrease in charitable donations and a $12 million increase in interest income, both primarily at the parent company. See Note 15 to the financial statements under "Southern Company" for additional information.
Income Taxes (Benefit)
The income tax benefit for these other business activities increased $65 million, or 27.9%, in 2023 as compared to 2022. The increase was primarily due to a $35 million tax benefit in 2023 related to a reversal of an uncertain tax position associated with the 2019 sale of Gulf Power and higher pre-tax losses, both at the parent company.
Alabama Power
Alabama Power's 2023 net income after dividends on preferred stock was $1.37 billion, representing a $30 million, or 2.2%, increase from 2022. The increase was primarily due to a decrease in income tax expense, an increase in Rate CNP Compliance revenues, a decrease in operations and maintenance expenses primarily related to the reliability reserve, and a lower Rate RSE customer refund accrual in 2023 compared to 2022. These increases to net income were offset by an increase in depreciation rates effective January 2023, a decrease in retail revenues associated with milder weather in Alabama Power's service territory in the first and second quarters of 2023 compared to the corresponding periods in 2022, and increases in capacity-related expenses and interest expense. See Note 2 to the financial statements under "Alabama Power" for additional information.
A condensed income statement for Alabama Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$7,050 $(767)
Fuel1,299 (541)
Purchased power504 (297)
Other operations and maintenance1,769 (166)
Depreciation and amortization1,401 526 
Taxes other than income taxes442 18 
Total operating expenses5,415 (460)
Operating income1,635 (307)
Allowance for equity funds used during construction82 12 
Interest expense, net of amounts capitalized425 43 
Other income (expense), net159 15 
Income taxes81 (342)
Net income1,370 19 
Dividends on preferred stock (11)
Net income after dividends on preferred stock$1,370 $30 
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Operating Revenues
Operating revenues for 2023 were $7.1 billion, reflecting a $767 million, or 9.8%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$6,470 
Estimated change resulting from —
Rates and pricing276 
Sales decline(33)
Weather(84)
Fuel and other cost recovery(470)
Retail — current year$6,159 $6,470 
Wholesale revenues —
Non-affiliates424 726 
Affiliates60 202 
Total wholesale revenues484 928 
Other operating revenues407 419 
Total operating revenues$7,050 $7,817 
Retail revenues decreased $311 million, or 4.8%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The decrease was primarily due to a decrease in fuel and other cost recovery, partially offset by an increase in revenues associated with rates and pricing primarily due to an increase in Rate CNP Compliance revenues and a lower Rate RSE customer refund accrual in 2023 compared to 2022.
See Note 2 to the financial statements under "Alabama Power – Rate ECR," " – Rate RSE," and " – Rate CNP Compliance" for additional information. See "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates include provisions to recognize the recovery of fuel costs, purchased power costs, PPAs certificated by the Alabama PSC, and costs associated with the NDR. Under these provisions, fuel and other cost recovery revenues generally equal fuel and other cost recovery expenses and do not affect net income. See Note 2 to the financial statements under "Alabama Power" for additional information.
Wholesale revenues from sales to non-affiliated utilities were as follows:
20232022
(in millions)
Capacity and other$163 $213 
Energy261 513 
Total non-affiliated$424 $726 
In 2023, wholesale revenues from sales to non-affiliates decreased $302 million, or 41.6%, as compared to 2022. The decrease reflects a 26.0% decrease in the volume of KWHs sold as a result of power sales agreements that ended in May 2023 and a 20.8% decrease in the price of energy primarily as a result of lower natural gas prices.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Alabama Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affect net income. Short-term opportunity energy sales are also included in wholesale energy sales to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Alabama Power's variable cost to produce the energy.
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In 2023, wholesale revenues from sales to affiliates decreased $142 million, or 70.3%, as compared to 2022. The revenue decrease reflects a 47.7% decrease in the price of energy due to lower natural gas prices and a 42.9% decrease in KWH sales due to lower customer demand as a result of milder weather in 2023.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales and purchases are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through Alabama Power's energy cost recovery clause.
In 2023, other operating revenues decreased $12 million, or 2.9%, as compared to 2022 primarily due to decreases of $25 million in cogeneration steam revenue associated with lower natural gas prices and $17 million in rent revenues, partially offset by a $34 million increase in unregulated sales of products and services.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change(*)
(in billions)
Residential17.4 (5.7)%(0.9)%
Commercial12.9 (1.2)0.4 
Industrial20.4 (2.8)(2.8)
Other0.1 (15.5)(15.5)
Total retail50.8 (3.4)(1.3)%
Wholesale
Non-affiliates9.3 (26.0)
Affiliates2.1 (42.9)
Total wholesale11.4 (29.9)
Total energy sales62.2 (9.7)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from the normal temperature conditions. Normal temperature conditions are defined as those experienced in Alabama Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. In 2023, weather-adjusted residential KWH sales decreased 0.9% primarily due to decreased customer usage. Weather-adjusted commercial KWH sales increased 0.4% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 2.8% as a result of a decrease in demand resulting from changes in production levels primarily in the chemicals and forest products sectors.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies related to changes in price and KWH sales.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, Alabama Power purchases a portion of its electricity needs from the wholesale market.
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Details of Alabama Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
54.558.3 
Total purchased power (in billions of KWHs)
10.811.6 
Sources of generation (percent)(a)
Coal35 46 
Gas31 24 
Nuclear27 22 
Hydro7 
Cost of fuel, generated (in cents per net KWH)
Coal3.46 3.39 
Gas(a)
2.99 5.12 
Nuclear0.69 0.67 
Average cost of fuel, generated (in cents per net KWH)(a)
2.50 3.19 
Average cost of purchased power (in cents per net KWH)(b)
4.98 8.00 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by Alabama Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $1.8 billion in 2023, a decrease of $838 million, or 31.7%, compared to 2022. The decrease was primarily due to a $674 million decrease in the average cost of fuel and purchased power and a $164 milliondecrease related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through Alabama Power's energy cost recovery clause. Alabama Power, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 2 to the financial statements under "Alabama Power – Rate ECR" for additional information.
Fuel
Fuel expense was $1.3 billion in 2023, a decrease of $541 million, or 29.4%, compared to 2022. The decrease was primarily due to a 41.6% decrease in the average cost of natural gas per KWH generated, which excludes tolling agreements, and a 29.1% decrease in the volume of KWHs generated by coal, partially offset by a 21.2% increase in the volume of KWHs generated by natural gas, an 18.9% decrease in the volume of KWHs generated by hydro facilities as a result of less rainfall in 2023, and a 13.6% increase in the volume of KWHs generated by nuclear.
Purchased Power Non-Affiliates
Purchased power expense from non-affiliates was $253 million in 2023, a decrease of $188 million, or 42.6%, compared to 2022. The decrease was primarily due to a 32.9% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 25.5% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power Affiliates
Purchased power expense from affiliates was $251 million in 2023, a decrease of $109 million, or 30.3%, compared to 2022. The decrease was primarily due to a 51.4% decrease in the average cost per KWH purchased primarily due to lower natural gas prices, partially offset by a 43.4% increase in the volume of KWHs purchased due to the availability of lower cost gas generation in the Southern Company system.
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Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $166 million, or 8.6%, in 2023 as compared to 2022. The change was primarily due to a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred, as well as decreases of $33 million in transmission and distribution expenses and $21 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $30 million in technology infrastructure and application production costs and $25 million in expenses related to unregulated products and services, as well as a $14 million decrease in nuclear property insurance refunds. See Note 2 to the financial statements under "Alabama Power – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $526 million, or 60.1%, in 2023 as compared to 2022 primarily due to an increase in depreciation rates effective in 2023. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $12 million, or 17.1%, in 2023 as compared to 2022 primarily due to increases in capital expenditures related to hydro production and Plant Barry Unit 8 construction. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $43 million, or 11.3%, in 2023 as compared to 2022. The increase reflects approximately $30 million related to higher average outstanding borrowings and $20 million related to higher interest rates. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $15 million, or 10.4%, in 2023 as compared to 2022 primarily due to a decrease in non-operating benefit-related expenses and an increase in interest income, partially offset by a decrease in non-service cost-related retirement benefits income. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $342 million, or 80.9%, in 2023 as compared to 2022 primarily due to a $252 million increase in the flowback of certain excess deferred income taxes and an $84 million decrease due to lower pre-tax earnings. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" and Note 10to the financial statements for additional information.
Georgia Power
Georgia Power's 2023 net income was $2.1 billion, representing a $0.3 billion, or 14.7%, increase from the previous year. The increase was primarily due to lower non-fuel operations and maintenance costs, revenue reductions in 2022 as a result of Georgia Power exceeding its allowed retail return range, a $187 million decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, and an increase in other revenues, partially offset by a decrease in retail revenues associated with lower contributions from customers with variable demand-driven pricing and milder weather in 2023, as well as higher interest expense. Also contributing to the net income growth were the impacts of the 2022 ARP effective January 1, 2023, including increased retail rates, largely offset by higher depreciation and amortization. See Note 2 to the financial statements under "Georgia Power" for additional information.
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A condensed income statement for Georgia Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$10,118 $(1,466)
Fuel1,781 (705)
Purchased power1,281 (976)
Other operations and maintenance2,083 (266)
Depreciation and amortization1,681 251 
Taxes other than income taxes541 14 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total operating expenses7,299 (1,933)
Operating income2,819 467 
Allowance for equity funds used during construction165 25 
Interest expense, net of amounts capitalized626 141 
Other income (expense), net170 (6)
Income taxes (benefit)448 78 
Net income$2,080 $267 
Operating Revenues
Operating revenues for 2023 were $10.1 billion, reflecting a $1.5 billion, or 12.7%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$10,792 
Estimated change resulting from —
Rates and pricing172 
Sales decline(10)
Weather(141)
Fuel cost recovery(1,591)
Retail — current year$9,222 $10,792 
Wholesale revenues188 235 
Other operating revenues708 557 
Total operating revenues$10,118 $11,584 
Retail revenues decreased $1.6 billion, or 14.5%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing was primarily due to base tariff increases in accordance with the 2022 ARP and revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed retail ROE range, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in revenues recognized under the NCCR tariff. See Note 2 to the financial statements under "Georgia Power – Rate Plans" and " – Nuclear Construction" for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather in 2023.
Electric rates include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses and do not affect net income. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
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Wholesale revenues from power sales were as follows:
20232022
(in millions)
Capacity and other$66 $48 
Energy122 187 
Total$188 $235 
In 2023, wholesale revenues decreased $47 million, or 20.0%, as compared to 2022 largely due to an $81 million decrease related to the average cost per KWH sold due to lower Southern Company system fuel and purchased power costs, partially offset by a $21 million increase related to new capacity contracts and a $13 million increase related to the volume of KWH sales associated with higher market demand.
Wholesale revenues from sales to non-affiliates consist of PPAs and short-term opportunity sales. Wholesale revenues from PPAs have both capacity and energy components. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms and provide for recovery of fixed costs and a return on investment. Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Georgia Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above Georgia Power's variable cost of energy.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues increased $151 million, or 27.1%, as compared to 2022 primarily due to an increase of $105 million in unregulated sales associated with power delivery construction and maintenance, outdoor lighting, and energy conservation projects, a net increase of $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs, an increase of $17 million in retail solar program fees, and a $9 million increase in open access transmission tariff sales.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential27.6 (5.0)%(0.4)%
Commercial32.6 0.1 1.2 
Industrial23.5 (1.6)(1.4)
Other0.4 (4.7)(4.2)
Total retail84.1 (2.1)(0.1)%
Wholesale2.6 7.8 
Total energy sales86.7 (1.9)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Georgia Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. Weather-adjusted residential sales decreased 0.4% primarily due to decreased customer usage, largely offset by customer growth. Weather-adjusted commercial KWH sales increased 1.2% primarily due to customer growth. Weather-adjusted industrial KWH sales decreased
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1.4% primarily due to decreases in the textile, mining, and stone, clay, and glass sectors, partially offset by an increase in the paper sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for Georgia Power. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Georgia Power purchases a portion of its electricity needs from the wholesale market.
Details of Georgia Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
60.359.7 
Total purchased power (in billions of KWHs)
29.633.6 
Sources of generation (percent) —
Gas49 48 
Nuclear(a)
29 27 
Coal19 21 
Hydro and other3 
Cost of fuel, generated (in cents per net KWH)
Gas3.07 5.06 
Nuclear(a)
0.82 0.75 
Coal5.59 4.12 
Average cost of fuel, generated (in cents per net KWH)(a)
2.90 3.64 
Average cost of purchased power (in cents per net KWH)(b)
4.63 7.88 
(a)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(b)Average cost of purchased power includes fuel purchased by Georgia Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $3.1 billion in 2023, a decrease of $1.7 billion, or 35.4%, compared to 2022. The decrease was due to decreases of $1.4 billion related to the average cost of fuel and purchased power and $321 million related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through Georgia Power's fuel cost recovery mechanism. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Fuel
Fuel expense was $1.8 billion in 2023, a decrease of $0.7 billion, or 28.4%, compared to 2022. The decrease was primarily due to decreases of 39.3% in the average cost per KWH generated by natural gas and 8.9% in the volume of KWHs generated by coal, partially offset by increases of 35.7% in the average cost per KWH generated by coal, 9.3% in the average cost per KWH generated by nuclear, 8.5% in the volume of KWHs generated by nuclear, and 2.1% in the volume of KWHs generated by natural gas.
Purchased Power – Non-Affiliates
Purchased power expense from non-affiliates was $517 million in 2023, a decrease of $339 million, or 39.6%, compared to 2022. The decrease was primarily due to a decrease of 33.9% in the volume of KWHs purchased due to lower demand and the availability of lower cost generation in the Southern Company system and a decrease of 22.3% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
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Purchased Power – Affiliates
Purchased power expense from affiliates was $764 million in 2023, a decrease of $637 million, or 45.5%, compared to 2022. The decrease was primarily due to a decrease of 49.1% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $266 million, or 11.3%, in 2023 as compared to 2022. The decrease was primarily due to decreases of $182 million in storm damage recovery as authorized in the 2022 ARP, $178 million in transmission and distribution expenses primarily associated with line maintenance, $74 million in generation non-outage maintenance expenses, and $28 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $60 million from unregulated power delivery construction and maintenance and energy conservation projects, $59 million in generation environmental projects, $55 million in technology infrastructure and application production costs, and $28 million in planned generation outages. See Note 2 to the financial statements under "Georgia Power – Storm Damage Recovery" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $251 million, or 17.6%, in 2023 as compared to 2022 primarily due to increases of $190 million resulting from higher depreciation rates as authorized in the 2022 ARP and $75 million associated with additional plant in service, partially offset by a decrease of $15 million in amortization of regulatory assets related to the retirement of certain generating units that ended in 2022.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $14 million, or 2.7%, in 2023 as compared to 2022 primarily due to an increase of $56 million in property taxes primarily resulting from an increase in the assessed value of property, largely offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $25 million, or 17.9%, in 2023 as compared to 2022 primarily due to an increase in capital expenditures subject to AFUDC.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $141 million, or 29.1%, in 2023 as compared to 2022. The increase primarily reflects approximately $78 million related to higher interest rates and $76 million related to higher average outstanding borrowings, partially offset by the deferral of $14 million in financing costs related to Plant Vogtle Unit 3. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information. Also see Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
Other Income (Expense), Net
Other income (expense), net decreased $6 million, or 3.4%, in 2023 as compared to 2022 primarily due to decreases in non-service cost-related retirement benefits income and customer charges related to contributions in aid of construction, partially offset by a decrease in charitable donations. See Note 11 to the financial statements for additional information on Georgia Power's net periodic pension and other postretirement benefit costs.
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Income Taxes (Benefit)
Income taxes increased $78 million, or 21.1%, in 2023 as compared to 2022 primarily due to the flowback of $145 million of certain excess deferred income taxes that ended in 2022 and higher pre-tax earnings largely resulting from lower charges associated with the construction of Plant Vogtle Units 3 and 4, partially offset by an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards, generation of $35 million of advanced nuclear PTCs, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" and Note 10to the financial statements for additional information.
Mississippi Power
Mississippi Power's net income was $188 million in 2023 compared to $164 million in 2022. The increase was primarily due to an increase in affiliate wholesale capacity revenues, changes in power supply agreements, and a decrease in non-fuel operations and maintenance expenses, partially offset by an increase in interest expense.
A condensed income statement for Mississippi Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$1,474 $(220)
Fuel and purchased power538 (251)
Other operations and maintenance362 (14)
Depreciation and amortization190 9 
Taxes other than income taxes124  
Total operating expenses1,214 (256)
Operating income260 36 
Interest expense, net of amounts capitalized71 15 
Other income (expense), net35 2 
Income taxes36 (1)
Net income$188 $24 
Operating Revenues
Operating revenues for 2023 were $1.5 billion, reflecting a $220 million, or 13.0%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$935 
Estimated change resulting from —
Rates and pricing(11)
Sales growth11 
Weather(4)
Fuel and other cost recovery32 
Retail — current year$963 $935 
Wholesale revenues —
Non-affiliates272 252 
Affiliates200 460 
Total wholesale revenues472 712 
Other operating revenues39 47 
Total operating revenues$1,474 $1,694 
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Total retail revenues for 2023 increased $28 million, or 3.0%, compared to 2022 primarily due to higher recoverable fuel costs and an increase in customer usage, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and lower revenues associated with a tolling arrangement accounted for as a sales-type lease. See Notes 2 and 9 to the financial statements under "Mississippi Power" and "Lessor," respectively, for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates for Mississippi Power include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not affect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside Mississippi Power's service territory. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" for additional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
20232022
(in millions)
Capacity and other$21 $
Energy251 249 
Total non-affiliated$272 $252 
Wholesale revenues from sales to non-affiliates increased $20 million, or 7.9%, compared to 2022. The increase was primarily due to capacity revenues associated with new capacity contracts in 2023.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Mississippi Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. In addition, Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023. Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Mississippi Power's variable cost to produce the energy. See Note 2 under "Mississippi Power – Municipal and Rural Associations Tariff" for additional information.
Wholesale revenues from sales to affiliates decreased $260 million, or 56.5%, in 2023 compared to 2022. The decrease was primarily due to a $293 million decrease associated with lower natural gas prices, partially offset by a $23 million increase in capacity revenues resulting from availability of generation reserves and an increase in pricing and a $10 million increase associated with higher KWH sales.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. The energy portion of these transactions does not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues decreased $8 million, or 17.0%, as compared to 2022 primarily due to decreases of $5 million in unregulated sales associated with power delivery construction and maintenance projects and $3 million in open access transmission tariff revenues.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted Percent Change(*)
(in millions)
Residential2,092 (1.9)%0.7 %
Commercial2,815 7.0 7.1 
Industrial4,721 0.7 0.7 
Other28 (11.1)(11.1)
Total retail9,656 1.8 %2.5 %
Wholesale
Non-affiliated3,836 10.7 
Affiliated5,612 2.2 
Total wholesale9,448 5.5 
Total energy sales19,104 3.6 %
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Mississippi Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales increased in 2023 when compared to 2022. Weather-adjusted residential KWH sales increased 0.7% due to an increase in customer usage. Weather-adjusted commercial KWH sales increased 7.1% primarily due to customer growth. Industrial KWH sales increased 0.7% primarily due to an increase in the non-manufacturing sector, partially offset by a decrease in the chemicals sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Mississippi Power purchases a portion of its electricity needs from the wholesale market.
Details of Mississippi Power's generation and purchased power were as follows:
20232022
Total generation (in millions of KWHs)
18,789 18,303 
Total purchased power (in millions of KWHs)
524 617 
Sources of generation (percent) –
Gas92 90 
Coal8 10 
Cost of fuel, generated (in cents per net KWH) –
Gas2.68 4.34 
Coal5.46 4.13 
Average cost of fuel, generated (in cents per net KWH)
2.90 4.31 
Average cost of purchased power (in cents per net KWH)
4.27 6.91 
Fuel and purchased power expenses were $538 million in 2023, a decrease of $251 million, or 31.8%, as compared to 2022. The decrease was primarily due to a $266 million decrease related to the average cost of fuel and purchased power, partially offset by a $15 million net increase related to the volume of KWHs generated and purchased.
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Fuel and purchased power energy transactions do not have a significant impact on earnings since energy expenses are generally offset by energy revenues through Mississippi Power's fuel cost recovery clauses. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" and Note 1 to the financial statements under "Fuel Costs" for additional information.
Fuel expense decreased $230 million, or 30.8%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost of natural gas per KWH generated and a 20.3% decrease in the volume of KWHs generated by coal, partially offset by a 32.2% increase in the average cost of coal per KWHs generated and a 5.4% increase in the volume of KWHs generated by natural gas.
Purchased power expense decreased $21 million, or 49.9%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 15.1% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $14 million, or 3.7%, in 2023 compared to 2022. The decrease was primarily due to decreases of $14 million in reliability reserve accruals, $7 million in generation expenses, and $6 million in unregulated power delivery construction and maintenance projects, partially offset by increases of $5 million in storm reserve accruals and $2 million in certain employee compensation and benefit expenses. See Note 2 to the financial statements under "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $9 million, or 5.0%, in 2023 compared to 2022 primarily due to an increase in depreciation associated with additional plant in service.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $15 million, or 26.8%, in 2023 compared to 2022. The increase was primarily due to increases of approximately $10 million related to higher interest rates and $5 million related to higher average outstanding borrowings. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information.
Income Taxes
Income taxes decreased $1 million, or 2.7%, in 2023 compared to 2022 primarily due to a decrease of $7 million associated with the flowback of certain excess deferred income taxes associated with new PEP rates that became effective in April 2023, largely offset by an increase of $6 million associated with higher pre-tax earnings. See Note 2 to the financial statements under "Mississippi Power – Performance Evaluation Plan" and Note 10 to the financial statements for additional information.
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Southern Power
Net income attributable to Southern Power for 2023 was $357 million, a $3 million increase from 2022. The increase was primarily due to higher HLBV income associated with tax equity partnerships, an arbitration award received for losses previously incurred, a gain on the sale of spare parts, and receipts of liquidated damages and insurance proceeds related to generation facility production and equipment, as well as changes in state apportionment methodology related to tax legislation enacted by the State of Tennessee. These increases were largely offset by lower revenues driven by lower market prices of energy.
A condensed statement of income follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$2,189 $(1,180)
Fuel706 (908)
Purchased power116 (195)
Other operations and maintenance473 (9)
Depreciation and amortization504 (12)
Taxes other than income taxes51 2 
Loss on sales-type leases (1)
Gain on dispositions, net(20)(18)
Total operating expenses1,830 (1,141)
Operating income359 (39)
Interest expense, net of amounts capitalized129 (9)
Other income (expense), net12 5 
Income taxes (benefit)12 (8)
Net income230 (17)
Net loss attributable to noncontrolling interests(127)(20)
Net income attributable to Southern Power$357 $3 
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company power pool.
Natural Gas Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to operating income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of Southern Power's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have capacity revenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy generated from the respective facility and sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.
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See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.
Operating Revenues Details
Details of Southern Power's operating revenues were as follows:
20232022
(in millions)
PPA capacity revenues$471 $451 
PPA energy revenues1,227 2,121 
Total PPA revenues1,698 2,572 
Non-PPA revenues436 761 
Other revenues55 36 
Total operating revenues$2,189 $3,369 
Operating revenues for 2023 were $2.2 billion, a $1.2 billion, or 35.0% decrease from 2022. The change in operating revenues was primarily due to the following:
PPA capacity revenuesincreased $20 million, or 4.4%, primarily due to an increase associated with a change in rates from new and existing natural gas PPAs.
PPA energy revenues decreased $894 million, or 42.1%, primarily due to a $904 million decrease in sales under natural gas PPAs resulting from a $726 million decrease in the price of fuel and purchased power and a $178 million decrease in the volume of KWHs sold.
Non-PPA revenues decreased $325 million, or 42.7%, primarily due to a $650 million decrease in the market price of energy, partially offset by a $321 million increase in the volume of KWHs sold through short-term sales.
Other revenues increased $19 million, or 52.8%, primarily due to receipts of liquidated damages associated with generation facility production guarantees, an arbitration award received for losses previously incurred, and business interruption insurance proceeds for damaged generation equipment. See Note 3 to the financial statements under "General Litigation Matters – Southern Power" for additional information.
Fuel and Purchased Power Expenses
Details of Southern Power's generation and purchased power were as follows:
Total
KWHs
Total KWH % ChangeTotal
KWHs
20232022
(in billions of KWHs)
Generation4948
Purchased power33
Total generation and purchased power522.0%51
Total generation and purchased power (excluding solar, wind, fuel cells, and tolling agreements)
336.5%31
Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
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Details of Southern Power's fuel and purchased power expenses were as follows:
20232022
(in millions)
Fuel$706 $1,614 
Purchased power116 311 
Total fuel and purchased power expenses$822 $1,925 
In 2023, total fuel and purchased power expenses decreased $1.1 billion, or 57.3%, compared to 2022. Fuel expensedecreased $908 million, or 56.3%, primarily due to a $1.0 billion decrease associated with the average cost of fuel. Purchased power expense decreased $195 million, or 62.7%, primarily due to a $206 million decrease associated with the average cost of purchased power.
Gain on Dispositions, Net
In 2023, gain on dispositions, net increased $18 million compared to 2022 primarily due to a $16 million gain on the sale of spare parts in 2023.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized decreased $9 million, or 6.5%, compared to 2022. The decrease was primarily due to lower average outstanding borrowings.
Income Taxes (Benefit)
In 2023, income taxes decreased $8 million, or 40.0%, compared to 2022. The decrease was primarily due to a change in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in the second quarter 2023. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate," respectively, for additional information.
Net Loss Attributable to Noncontrolling Interests
In 2023, net loss attributable to noncontrolling interests increased $20 million, or 18.7%, compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to wind tax equity partners and $5 million in lower income allocations to equity partners, partially offset by $10 million in lower HLBV loss allocations to battery energy storage partners.
Southern Company Gas
Southern Company Gas has various regulatory mechanisms, such as weather and revenue normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of Gulfits utility's respective service territory. Southern Company Gas also utilizes weather hedges to limit the negative income impacts in the event of warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. Therefore, weather typically does not have a significant net income impact.
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas and bad debt expense, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing Southern Company Gas' annual results. Thus, Southern Company Gas' operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
Percent Generated During
Heating Season
Operating RevenuesNet
Income
202367 %73 %
202267 %66 %
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Net Income
Net income attributable to Southern Company Gas in 2023 was $615 million, an increase of $43 million, or 7.5%, compared to 2022. Net income increased primarily as a result of an impairment charge in 2022 related to the sale of natural gas storage facilities. The increase in net income was partially offset by a decrease of $29 million in net income at gas distribution operations primarily as a result of reduced revenue due to lower volumes sold, regulatory disallowances at Nicor Gas, and higher depreciation related to continued investment in infrastructure replacement programs, partially offset by lower cost of gas, and a $9 million decrease in net income at gas pipeline investments primarily as a result of higher expenses at SNG.
A condensed income statement for Southern Company Gas follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Earnings before income taxes826 74 
Income taxes211 31 
Net Income$615 $43 
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from
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customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Customer Count
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas distribution operations' and gas marketing services' customers are primarily located in Georgia and Illinois.
The following table provides the number of customers served by Southern Company Gas at December 31, 2023 and 2022:
20232022
(in thousands, except market share %)
Gas distribution operations4,374 4,358 
Gas marketing services
Energy customers665 622 
Market share of energy customers in Georgia30.0 %29.3 %
Southern Company Gas anticipates customer growth and uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at gas distribution operations represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
In 2023, cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
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Volumes of Natural Gas Sold
Southern Company Gas' natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas.
The following table details the volumes of natural gas sold during all periods presented:
2023 vs. 2022
20232022% Change
Gas distribution operations (mmBtu in millions)
Firm625 707 (11.6)%
Interruptible93 93  
Total718 800 (10.3)%
Gas marketing services (mmBtu in millions)
Firm:
Georgia33 35 (5.7)%
Other19 18 5.6 
Interruptible large commercial and industrial14 14  
Total66 67 (1.5)%
Other Operations and Maintenance Expenses
In 2023, other operations and maintenance expenses increased $18 million, or 1.5%, compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Depreciation and Amortization
In 2023, depreciation and amortization increased $23 million, or 4.1%, compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
In 2023, taxes other than income taxes decreased $20 million, or 7.1%, compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized increased $47 million, or 17.9%, compared to 2022. The increase reflects $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
In 2023, income taxes increased $31 million, or 17.2%, compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes
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related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Segment Information
20232022
Operating RevenuesOperating ExpensesNet Income (Loss)Operating RevenuesOperating ExpensesNet Income (Loss)
(in millions)(in millions)
Gas distribution operations$4,105 $3,301 $441 $5,267 $4,464 $470 
Gas pipeline investments32 10 98 32 11 107 
Gas marketing services548 418 91 638 505 94 
All other36 40 (15)55 190 (99)
Intercompany eliminations(19)(6) (30)(22)— 
Consolidated$4,702 $3,763 $615 $5,962 $5,148 $572 
Gas Distribution Operations
Gas distribution operations is the largest component of Southern Company Gas' business and is subject to regulation and oversight by regulatory agencies in each of the states it serves. These agencies approve natural gas rates designed to provide Southern Company Gas with the opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest expense, operations and maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, Southern Company Gas' second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. Southern Company Gas has various regulatory and other mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit its exposure to changes in customer consumption, including weather changes within typical ranges in its natural gas distribution utilities' service territories. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income decreased $29 million, or 6.2%, compared to 2022. Operating revenues decreased $1.2 billion primarily due to lower gas cost recovery and lower volumes sold, partially offset by rate increases and continued investment in infrastructure replacement. Gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas. Operating expenses decreased $1.2 billion primarily due to a $1.3 billion decrease in the cost of natural gas as a result of lower gas prices compared to 2022 and lower taxes other than income taxes, partially offset by $88 million related to the regulatory disallowances at Nicor Gas, higher depreciation resulting from additional assets placed in service, higher compensation and benefits expenses, and a $20 million increase related to energy service contracts. The decrease in operating expenses also includes costs passed through directly to customers, primarily related to bad debt expenses, energy efficiency programs, and revenue taxes. The decrease in net income also includes an increase of $46 million in interest expense, net of amounts capitalized primarily due to higher interest rates and higher average outstanding debt, partially offset by a $19 million decrease in income taxes primarily as a result of the tax benefit resulting from the regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Gas Pipeline Investments
Gas pipeline investments consists primarily of joint ventures in natural gas pipeline investments including SNG and Dalton Pipeline. In 2023, net income decreased $9 million compared to 2022. The decrease was primarily due to lower earnings at SNG resulting from higher expenses. See Note 7 to the financial statements under "Southern Company Gas" for additional information.
Gas Marketing Services
Gas marketing services provides energy-related products and services to natural gas markets and participants in customer choice programs that were approved in various states to increase competition. These programs allow customers to choose their natural gas supplier while the local distribution utility continues to provide distribution and transportation services. Gas marketing
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services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts.
In 2023, net income decreased $3 million, or 3.2%, compared to 2022. The decrease was due to a $90 million decrease in operating revenues primarily due to lower gas prices and the timing of unrealized hedge losses, largely offset by an $87 million decrease in operating expenses primarily related to a $106 million decrease in cost of gas, partially offset by higher compensation and benefits.
All Other
All other includes natural gas storage businesses, a renewable natural gas business, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the reportable segments and interest income (expense) associated with affiliate financing arrangements. All other included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income increased $84 million compared to 2022. The increase was primarily due to a decrease in operating expenses primarily related to pre-tax impairment charges in 2022 totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities, lower depreciation, lower cost of gas, and lower taxes other than income taxes, partially offset by a decrease in operating revenues of $19 million and an increase in income taxes. See Note 10 to the financial statements and Note 15 to the financial statements under "Southern Company Gas"for additional information.
FUTURE EARNINGS POTENTIAL
General
Prices for electric service provided by the traditional electric operating companies and natural gas distribution service provided by the natural gas distribution utilities to retail customers are set by state PSCs or other applicable state regulatory agencies under cost-based regulatory principles. Retail rates and earnings are reviewed through various regulatory mechanisms and/or processes and may be adjusted periodically within certain limitations. Effectively operating pursuant to these regulatory mechanisms and/or processes and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the traditional electric operating companies and natural gas distribution utilities for the foreseeable future. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Southern Power continues to focus on long-term PPAs. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 2 to the financial statements for additional information about regulatory matters.
Each Registrant's results of operations are not necessarily indicative of its future earnings potential. The level of the Registrants' future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Registrants' primary businesses of selling electricity and/or distributing natural gas, as described further herein.
For the traditional electric operating companies, these factors include the ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs during a time of increasing costs, including those related to projected long-term demand growth, stringent environmental standards, including CCR rules, safety, system reliability and resiliency, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants and expanding and improving the transmission and distribution systems; continued customer growth; and the trends of higher inflation and reduced electricity usage per customer, especially in residential and commercial markets. For Georgia Power, other major factors are completing construction and start-up of Plant Vogtle Unit 4 and meeting the related cost and schedule projections.
Earnings in the electricity business will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, which could contribute to a net reduction in customer usage.
Global and U.S. economic conditions continue to be affected by higher-than-expected inflation that arose from the COVID-19 pandemic and associated policy responses of governments and central banks. In response to elevated inflation levels, the U.S. Federal Reserve raised interest rates faster than any rate increase cycle in the last 40 years. The actions by the U.S. Federal Reserve have helped to slow the rate of inflation and curtail economic activity. Although target levels of inflation have yet to be achieved, the U.S. Federal Reserve has indicated its current intention to pause future rate increases and evaluate rate cuts in the near term. The shifting economic policy variables and weakening of historic relationships among economic activity, prices, and employment have increased the uncertainty of future levels of economic activity, which will directly impact future energy demand and operating costs. Weakening economic activity increases the risk of slowing or declining energy sales. See RESULTS OF OPERATIONS herein for information on energy sales in the Southern Company system's service territory during 2023.
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The level of future earnings for Southern Power's competitive wholesale electric business depends on numerous factors including the parameters of the wholesale market and the efficient operation of its wholesale generating assets; Southern Power's ability to execute its growth strategy through the development, construction, or acquisition of renewable facilities and other energy projects while containing costs; regulatory matters; customer creditworthiness; total electric generating capacity available in Southern Power's market areas; Southern Power's ability to successfully remarket capacity as current contracts expire; renewable portfolio standards; continued availability of federal and state ITCs and PTCs, which could be impacted by future tax legislation; transmission constraints; cost of generation from units within the Southern Company power pool; and operational limitations. See "Income Tax Matters" herein for information regarding the IRA's expansion of the availability of federal ITCs and PTCs. Also see Notes 10 and 15 to the financial statements for additional information.
The level of future earnings for Southern Company Gas' primary business of distributing natural gas and its complementary businesses in the gas pipeline investments and gas marketing services sectors depends on numerous factors. These factors include the natural gas distribution utilities' ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs, including those related to projected long-term demand growth, safety, system reliability and resiliency, natural gas, and capital expenditures, including expanding and improving the natural gas distribution systems; the completion and subsequent operation of ongoing infrastructure and other construction projects; customer creditworthiness; and certain policies to limit the use of natural gas, such as the potential in Illinois and across certain other parts of the U.S. for state or municipal bans on the use of natural gas or policies designed to promote electrification. The volatility of natural gas prices has an impact on Southern Company Gas' customer rates, its long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services business to capture value from locational and seasonal spreads. Additionally, changes in commodity prices, primarily driven by tight gas supplies, geopolitical events, and diminished gas production, subject a portion of Southern Company Gas' operations to earnings variability and may result in higher natural gas prices. Additional economic factors may contribute to this environment. The demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis. Alternatively, a significant drop in oil and natural gas prices could lead to a consolidation of natural gas producers or reduced levels of natural gas production.
Earnings for both the electricity and natural gas businesses are subject to a variety of other factors. These factors include weather; competition; developing new and maintaining existing energy contracts and associated load requirements with wholesale customers; customer energy conservation practices; the use of alternative energy sources by customers; government incentives to reduce overall energy usage; fuel, labor, and material prices in an environment of heightened inflation and material and labor supply chain disruptions; and the price elasticity of demand. Demand for electricity and natural gas in the Registrants' service territories is primarily driven by the pace of economic growth or decline that may be affected by changes in regional and global economic conditions, which may impact future earnings.
Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023.
As part of its ongoing effort to adapt to changing market conditions, Southern Company continues to evaluate and consider a wide array of potential business strategies. These strategies may include business combinations, partnerships, and acquisitions involving other utility or non-utility businesses or properties, disposition of, or the sale of interests in, certain assets or businesses, internal restructuring, or some combination thereof. Furthermore, Southern Company may engage in new business ventures that arise from competitive and regulatory changes in the utility industry. Pursuit of any of the above strategies, or any combination thereof, may significantly affect the business operations, risks, and financial condition of Southern Company. In addition, Southern Power and Southern Company Gas regularly consider and evaluate joint development arrangements as well as acquisitions and dispositions of businesses and assets as part of their business strategies. See Note 15 to the financial statements for additional information.
Environmental Matters
The Southern Company system's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, avian and other wildlife and habitat protection, and other natural resources. The Southern Company system maintains comprehensive environmental compliance and GHG strategies to assess both current and upcoming requirements and compliance costs associated with these environmental laws and regulations. New or revised environmental laws and regulations could further affect many areas of operations for the Subsidiary Registrants. The costs required to comply with environmental laws and regulations and to achieve stated goals, including capital expenditures, operations and maintenance costs, and costs reflected in ARO liabilities, may impact future electric generating unit retirement and replacement decisions (which are generally subject to approval from the traditional electric operating companies' respective state PSCs), results of operations, cash flows, and/or financial condition. Related costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, or changing fuel sources for certain existing
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units, as well as related upgrades to the Southern Company system's transmission and distribution (electric and natural gas) systems. A major portion of these costs is expected to be recovered through retail and wholesale rates, including existing ratemaking and billing provisions. The ultimate impact of environmental laws and regulations and the GHG goals discussed herein cannot be determined at this time and will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed technology, fuel prices, the outcome of pending and/or future legal challenges and regulatory matters, and the ability to continue recovering the related costs, through rates for the traditional electric operating companies and the natural gas distribution utilities and/or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.
Alabama Power and Mississippi Power recover environmental compliance costs through separate mechanisms, Rate CNP Compliance and the ECO Plan, respectively. Georgia Power's base rates include an ECCR tariff that allows for the recovery of environmental compliance costs. The natural gas distribution utilities of Southern Company Gas generally recover environmental remediation expenditures through rate mechanisms approved by their applicable state regulatory agencies. See Notes 2 and 3 to the financial statements for additional information.
Southern Power's PPAs generally contain provisions that permit charging the counterparty for some of the new costs incurred as a result of changes in environmental laws and regulations. Since Southern Power's units are generally newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and/or operating any type of existing or future facility. The impact of such laws, regulations, and other considerations on Southern Power and subsequent recovery through PPA provisions cannot be determined at this time.
Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity and natural gas, which could negatively affect results of operations, cash flows, and/or financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which may have the potential to affect their demand for electricity and natural gas.
Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, estimated capital expenditures through 2028 based on the current environmental compliance strategy for the Southern Company system and the traditional electric operating companies are as follows:
20242025202620272028Total
(in millions)
Southern Company$150 $141 $112 $92 $30 $525 
Alabama Power45 47 40 35 19 186 
Georgia Power92 80 60 32 10 274 
Mississippi Power13 13 12 26 65 
These estimates do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See "Environmental Laws and Regulations– Greenhouse Gases" and "– Water Quality" herein for additional information. The Southern Company system also anticipates substantial expenditures associated with ash pond closure and groundwater monitoring under the CCR Rule and related state rules, which are reflected in the applicable Registrants' ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein and Note 6 to the financial statements for additional information.
Environmental Laws and Regulations
Air Quality
Since 1990, the Southern Company system reduced SO2 and NOX air emissions by 99% and 92%, respectively, through 2022. Since 2005, the Southern Company system reduced mercury air emissions by 97% through 2022.
On February 13, 2023, the EPA published a final rule disapproving 19 state implementation plans (SIPs), including the States of Alabama and Mississippi, under the interstate transport (good neighbor) provisions of the Clean Air Act for the 2015 Ozone National Ambient Air Quality Standards (NAAQS). On March 14, 2023 and March 15, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the EPA's disapproval of the Mississippi SIP in the U.S. Court of Appeals for the
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Fifth Circuit. On June 8, 2023, the U.S. Court of Appeals for the Fifth Circuit stayed the EPA's disapproval of the Mississippi SIP, pending appeal. On April 13, 2023 and April 14, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the EPA's disapproval of the Alabama SIP in the U.S. Court of Appeals for the Eleventh Circuit. On August 17, 2023, the U.S. Court of Appeals for the Eleventh Circuit stayed the EPA's disapproval of the Alabama SIP, pending appeal.
On June 5, 2023, the EPA published the 2015 Ozone NAAQS Good Neighbor federal implementation plan (FIP), which requires reductions in NOX emissions from sources in 23 states, including Alabama and Mississippi, to assure those states satisfy their Clean Air Act good neighbor obligations for the 2015 Ozone NAAQS. Georgia and North Carolina have approved interstate transport SIPs addressing the 2015 Ozone NAAQS and are not subject to this rule. On June 16, 2023 and June 27, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the FIP for Mississippi in the U.S. Court of Appeals for the Fifth Circuit. On August 4, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the FIP for Alabama in the U.S. Court of Appeals for the Eleventh Circuit. Both cases are being held in abeyance pending resolution of the Mississippi SIP disapproval and Alabama SIP disapproval cases, respectively.
In July and September 2023, the EPA published an Interim Final Rule and an updated Interim Final Rule that stays the implementation of the FIPs for states with judicially stayed SIP disapprovals, including Mississippi and Alabama, respectively. The Interim Final Rule revises the existing regulations to maintain currently applicable trading programs for those states.
The ultimate impact of the rule and associated legal matters cannot be determined at this time; however, implementation of the FIPs will likely result in increased compliance costs for the traditional electric operating companies.
Water Quality
In 2020, the EPA published the final steam electric ELG reconsideration rule (ELG Reconsideration Rule), a reconsideration of the 2015 ELG rule's limits on bottom ash transport water and flue gas desulfurization wastewater that extended the latest applicability date for both discharges to December 31, 2025. The ELG Reconsideration Rule also updated the voluntary incentive program and provided new subcategories for low utilization electric generating units and electric generating units that will permanently cease coal combustion by 2028. On March 29, 2023, the EPA published a proposed ELG Supplemental Rule revising certain effluent limits of the 2020 and 2015 ELG rules. The proposal imposes more stringent requirements for flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate to be met no later than December 31, 2029. The EPA is also proposing that a limited number of facilities already achieving compliance with the 2020 ELG Reconsideration Rule be allowed to elect retirement or repowering by December 31, 2032 as opposed to meeting the new more stringent requirements. The proposal maintains the 2020 ELG Reconsideration Rule's permanent cessation of coal combustion subcategory allowing units to continue to operate until the end of 2028 without having to install additional technologies. The proposal also maintains the Voluntary Incentive Program (VIP) subcategory, which allows units to comply with VIP limits by December 31, 2028. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
As required by the ELG Reconsideration Rule, in 2021, Alabama Power and Georgia Power each submitted initial notices of planned participation (NOPP) for applicable units seeking to qualify for these cessation of coal combustion or VIP subcategories that require compliance by December 31, 2028.
Alabama Power submitted its NOPP to the Alabama Department of Environmental Management (ADEM) indicating plans to retire Plant Barry Unit 5 (700 MWs) and to cease using coal and begin operating solely on natural gas at Plant Barry Unit 4 (350 MWs) and Plant Gaston Unit 5 (880 MWs). Alabama Power, as agent for SEGCO, indicated plans to retire Plant Gaston Units 1 through 4 (1,000 MWs). However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. The NOPP submittals are subject to the review of the ADEM. Plant Barry Unit 4 ceased using coal and began to operate solely on natural gas in December 2022. See Notes 2 and 7 to the financial statements under "Georgia Power – Integrated Resource Plans" and "SEGCO," respectively, for additional information.
The remaining assets for which Alabama Power has indicated retirement, due to early closure or repowering of the unit to natural gas, have net book values totaling approximately $1.2 billion (excluding capitalized asset retirement costs which are recovered through Rate CNP Compliance) at December 31, 2023. Based on an Alabama PSC order, Alabama Power is authorized to establish a regulatory asset to record the unrecovered investment costs, including the plant asset balance and the site removal and closure costs, associated with unit retirements caused by environmental regulations (Environmental Accounting Order). Under the Environmental Accounting Order, the regulatory asset would be amortized and recovered over an affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance. See Note 2 to the financial statements under "Alabama Power – Rate CNP Compliance" and " – Environmental Accounting Order" for additional information.
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Georgia Power submitted its NOPP to the Georgia Environmental Protection Division (EPD) indicating plans to retire Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership), which occurred in August 2022, Plant Bowen Units 1 and 2 (1,400 MWs), and Plant Scherer Unit 3 (614 MWs based on 75% ownership) on or before the compliance date of December 31, 2028. Georgia Power also submitted a NOPP indicating plans to pursue compliance with the ELG Reconsideration Rule for Plant Scherer Units 1 and 2 (137 MWs based on 8.4% ownership) through the voluntary incentive program by no later than December 31, 2028. Georgia Power intends to comply with the ELG Rules for Plant Bowen Units 3 and 4 through the generally applicable requirements by December 31, 2025; therefore, no NOPP submission was required for these units. The NOPP submittals and generally applicable requirements are subject to the review of the Georgia EPD and decisions related to retirement or continued operation of units are subject to Georgia PSC approval. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the management and disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (ash ponds) at active electric generating power plants. The CCR Rule requires landfills and ash ponds to be evaluated against a set of performance criteria and potentially closed if certain criteria are not met. Closure of existing landfills and ash ponds requires installation of equipment and infrastructure to manage CCR in accordance with the CCR Rule. In addition to the federal CCR Rule, the States of Alabama and Georgia finalized state regulations regarding the management and disposal of CCR within their respective states. In 2019, the State of Georgia received partial approval from the EPA for its state CCR permitting program, which has broader applicability than the federal rule. The State of Mississippi has not developed a state CCR permit program.
On August 14, 2023, the EPA published a proposal to deny the ADEM's CCR permit program application. Alabama Power's permits to close its CCR facilities remain valid under state law. In the absence of an EPA-approved state permit program, CCR facilities in Alabama will remain subject to both the federal and state CCR rules.
The Holistic Approach to Closure: Part A rule, finalized in 2020, revised the deadline to stop sending CCR and non-CCR wastes to unlined surface impoundments to April 11, 2021 and established a process for the EPA to approve extensions to the deadline. The traditional electric operating companies stopped sending CCR and non-CCR wastes to their unlined impoundments prior to April 11, 2021 and, therefore, did not submit requests for extensions. Beginning in January 2022, the EPA issued numerous Part A determinations that state its current positions on a variety of CCR Rule compliance requirements, such as criteria for groundwater corrective action and CCR unit closure. The traditional electric operating companies are working with state regulatory agencies to determine whether the EPA's current positions may impact closure and groundwater monitoring plans.
In April 2022, the Utilities Solid Waste Activities Group and a group of generating facility operators filed petitions for review in the U.S. Court of Appeals for the D.C. Circuit challenging whether the EPA's January 2022 actions establish new legislative rules that should have gone through notice-and-comment rulemaking. A decision by the court is expected in 2024. The ultimate impacts of the EPA's current positions are subject to the outcome of the pending litigation and any potential future rulemaking and cannot be determined at this time.
On May 18, 2023, the EPA published a proposed rule to establish two new categories of federally regulated CCR, legacy surface impoundments and CCR management units (CCRMUs). The proposal establishes accelerated compliance deadlines for legacy surface impoundments to meet regulatory requirements, including a requirement to initiate closure within 12 months after the effective date of the final rule. The EPA is also proposing a definition for CCRMUs. The EPA's proposal would also require facility evaluations to be completed at both active facilities and inactive facilities with one or more legacy surface impoundment to determine the presence or absence of CCRMUs. CCRMUs must comply with the CCR Rule's provisions for groundwater monitoring, corrective action, closure, and post-closure activities. On November 14, 2023, the EPA published a Notice of Data Availability supplementing the proposed rule, which sought comment on new data and a supplemental risk assessment that could be used to support final rulemaking. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
Based on requirements for closure and monitoring of landfills and ash ponds pursuant to the CCR Rule and applicable state rules, the traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to closure methodologies, schedules, and/or costs becomes available. Some of these updates have been, and future updates may be, material. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and the traditional electric operating companies could be materially impacted. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements," Notes 2 and 3 to the financial statements under "Georgia Power – Rate Plans" and "General Litigation Matters – Alabama Power," respectively, and Note 6 to the financial statements for additional information.
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Greenhouse Gases
On May 23, 2023, the EPA published proposed GHG standards and state plan guidelines for fossil fuel-fired power plants, which would require GHG limits for subcategories of both new and existing units based on technologies such as carbon capture and sequestration, low-GHG hydrogen co-firing, and natural gas co-firing. The proposed standards for new combustion turbines include subcategories for different operational uses including peaking, intermediate, and base load. Compliance with new source standards, once finalized, begins when the unit comes online. The proposed state plan guidelines for existing units include subcategories based on unit type, retirement date, size, and capacity factor. The EPA is proposing a 24-month state plan submission deadline for the existing unit implementation and may allow states to implement some limited form of trading and averaging for the state plans. Existing source compliance is proposed to begin as early as January 1, 2030, depending on the unit type and subcategory. The EPA also proposes to simultaneously repeal the Affordable Clean Energy rule. On November 17, 2023, the EPA published a final rule updating the regulations governing the processes and timelines for state and federal plans to implement existing source GHG performance standards. While this rule establishes the general requirements and timelines for states to follow in implementing the EPA's emissions guidelines, the pending final rule for GHG emissions from fossil fuel-fired power plants is expected to include schedules and other implementation requirements that will supersede these general provisions. On November 20, 2023, the EPA published a Supplemental Notice of Proposed Rulemaking for the pending rules for fossil fuel-fired power plants requesting additional input on how the EPA should address reliability concerns in the final rules. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
In 2021, the United States officially rejoined the Paris Agreement. The Paris Agreement establishes a non-binding universal framework for addressing GHG emissions based on nationally determined emissions reduction contributions and sets in place a process for tracking progress towards the goals every five years. In 2021, President Biden announced a new target for the United States to achieve a 50% to 52% reduction in economy-wide GHG emissions from 2005 levels by 2030. The target was accepted by the United Nations as the United States' nationally determined emissions reduction contribution under the Paris Agreement.
Additional GHG policies, including legislation, may emerge in the future requiring the United States to accelerate its transition to a lower GHG emitting economy; however, associated impacts are currently unknown. The Southern Company system has transitioned from an electric generating mix of 70% coal and 15% natural gas in 2007 to a mix of 17% coal and 54% natural gas in 2023. This transition has been supported in part by the Southern Company system retiring over 6,700 MWs of coal-fired generating capacity since 2010 and converting 3,700 MWs of generating capacity from coal to natural gas since 2015. In addition, the Southern Company system's capacity mix consists of over 11,600 MWs of renewable and storage facilities through ownership and long-term PPAs. See "Environmental Laws and Regulations – Water Quality" hereinfor information on plans to retire or convert to natural gas additional coal-fired generating capacity. In addition, Southern Company Gas has replaced over 6,000 miles of pipe material that was more prone to fugitive emissions (unprotected steel and cast-iron pipe), resulting in mitigation of more than 3.3 million metric tons of CO2 equivalents from its natural gas distribution system since 1998.
The following table provides the Registrants' 2022 and preliminary 2023 Scope 1 GHG emissions based on equity share of facilities:
2022Preliminary 2023
(in million metric tons of CO2 equivalent)
Southern Company(*)
8580
Alabama Power(*)
3528
Georgia Power2324
Mississippi Power99
Southern Power1313
Southern Company Gas(*)
22
(*)Includes GHG emissions attributable to disposed assets through the date of the applicable disposition and to acquired assets beginning with the date of the applicable acquisition. See Note 15 to the financial statements for additional information.
Southern Company system management has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Based on the preliminary 2023 emissions, the Southern Company system has achieved an estimated GHG emission reduction of 49% since 2007. GHG emissions decreased in 2023 when compared to 2022 as coal generation was displaced by lower carbon generation, including from Plant Vogtle Unit 3, as discussed further under RESULTS OF OPERATIONS – "Southern Company – Electricity Business" herein. Southern Company system management expects to achieve GHG reductions of greater than 50% as early as 2025, five years earlier than the established interim goal, and remain close to 50% through the late 2020s, followed thereafter by continued reductions. While none
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of Southern Company's subsidiaries are currently subject to renewable portfolio standards or similar requirements, management of the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. Southern Company system management plans to continue to pursue a diverse portfolio including low-carbon and carbon-free resources and energy efficiency resources; continue to transition the Southern Company system's generating fleet and make the necessary related investments in transmission and distribution systems; implement initiatives to reduce natural gas distribution operational emissions; continue its research and development with a particular focus on technologies that lower GHG emissions, including methods of removing carbon from the atmosphere; and constructively engage with policymakers, regulators, investors, customers, and other stakeholders to support outcomes leading to a net zero future.
Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and Southern Company Gas conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in their financial statements. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia (which represent substantially all of Southern Company Gas' accrued remediation costs) have all received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies. The traditional electric operating companies and Southern Company Gas may be liable for some or all required cleanup costs for additional sites that may require environmental remediation. See Note 3 to the financial statements under "Environmental Remediation" for additional information.
Regulatory Matters
See OVERVIEW – "Recent Developments" herein and Note 2 to the financial statements for a discussion of regulatory matters related to Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas, including items that could impact the applicable Registrants' future earnings, cash flows, and/or financial condition.
Alabama Power
On July 14, 2023, Alabama Power issued a request for proposals of between 100 MWs and 1,200 MWs of capacity beginning no later than December 1, 2028, with consideration for commencement as early as 2025. Any purchases will depend upon the cost competitiveness of the respective offers, as well as other options available to Alabama Power, and would ultimately require approval by the Alabama PSC. The ultimate outcome of this matter cannot be determined at this time.
Construction Programs
The Subsidiary Registrants are engaged in continuous construction programs to accommodate existing and estimated future loads on their respective systems. The Southern Company system strategy continues to include developing and constructing new electric generating facilities, expanding and improving the electric transmission and electric and natural gas distribution systems, and undertaking projects to comply with environmental laws and regulations.
For the traditional electric operating companies, major generation construction projects are subject to state PSC approval in order to be included in retail rates. The largest construction project currently underway in the Southern Company system is Plant Vogtle Unit 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information. Also see Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for information regarding Georgia Power's request with the Georgia PSC to develop, own, and operate three simple cycle combustion turbines at Plant Yates.
See Note 15 to the financial statements under "Southern Power" for information relating to Southern Power's construction of renewable energy facilities.
Southern Company Gas is engaged in various infrastructure improvement programs designed to update or expand the natural gas distribution systems of the natural gas distribution utilities to improve reliability and resiliency, reduce emissions, and meet operational flexibility and growth. The natural gas distribution utilities recover their investment and a return associated with these infrastructure programs through their regulated rates. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information on Southern Company Gas' construction program.
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See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein for additional information regarding the Registrants' capital requirements for their construction programs, including estimated totals for each of the next five years.
Southern Power's Power Sales Agreements
General
Southern Power has PPAs with some of the traditional electric operating companies, other investor-owned utilities, IPPs, municipalities, and other load-serving entities, as well as commercial and industrial customers. The PPAs are expected to provide Southern Power with a stable source of revenue during their respective terms.
Many of Southern Power's PPAs have provisions that require Southern Power or the counterparty to post collateral or an acceptable substitute guarantee if (i) S&P or Moody's downgrades the credit ratings of the respective company to an unacceptable credit rating, (ii) the counterparty is not rated, or (iii) the counterparty fails to maintain a minimum coverage ratio. See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein for additional information.
Southern Power works to maintain and expand its share of the wholesale market. During 2023, Southern Power continued to be successful in remarketing up to 438 MWs of annual natural gas generation capacity to load-serving entities through several PPAs extending over the next 16 years. Market demand is being driven by load-serving entities replacing expired purchase contracts and/or retired generation, as well as planning for future growth.
Natural Gas
Southern Power's electricity sales from natural gas facilities are primarily through long-term PPAs that consist of two types of agreements. The first type, referred to as a unit or block sale, is a customer purchase from a dedicated generating unit where all or a portion of the generation from that unit is reserved for that customer. Southern Power typically has the ability to serve the unit or block sale customer from an alternate resource. The second type, referred to as requirements service, provides that Southern Power serve the customer's capacity and energy requirements from a combination of the customer's own generating units and from Southern Power resources not dedicated to serve unit or block sales. Southern Power has rights to purchase power provided by the requirements customers' resources when economically viable.
As a general matter, substantially all of the PPAs provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel or purchased power relating to the energy delivered under such PPAs. To the extent a particular generating facility does not meet the operational requirements contemplated in the PPAs, Southern Power may be responsible for excess fuel costs. With respect to fuel transportation risk, most of Southern Power's PPAs provide that the counterparties are responsible for the availability of fuel transportation to the particular generating facility.
Capacity charges that form part of the PPA payments are designed to recover fixed and variable operation and maintenance costs based on dollars-per-kilowatt year. In general, to reduce Southern Power's exposure to certain operation and maintenance costs, Southern Power has LTSAs. See Note 1 to the financial statements under "Long-Term Service Agreements" for additional information.
Solar and Wind
Southern Power's electricity sales from solar and wind generating facilities are also primarily through long-term PPAs; however, these PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or provide Southern Power a certain fixed price for the electricity sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Generally, under the renewable generation PPAs, the purchasing party retains the right to keep or resell the associated renewable energy credits.
Income Tax Matters
Consolidated Income Taxes
The impact of certain tax events at Southern Company and/or its other subsidiaries can, and does, affect each Registrant's ability to utilize certain tax credits. See "Tax Credits" and ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Accounting for Income Taxes" herein and Note 10 to the financial statements for additional information.
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Tax Credits
Southern Company has received ITCs and PTCs in connection with investments in solar, wind, fuel cell, advanced nuclear, and battery energy storage facilities (co-located with existing solar facilities) primarily at Southern Power and Georgia Power.
Southern Power's ITCs relate to its investment in new solar facilities and battery energy storage facilities (co-located with existing solar facilities) that are acquired or constructed and its PTCs relate to the first 10 years of energy production from its wind facilities, which have had, and may continue to have, a material impact on Southern Power's cash flows and net income. At December 31, 2023, Southern Company and Southern Power had approximately $0.8 billion and $0.5 billion, respectively, of unutilized federal ITCs and PTCs, which are currently expected to be fully utilized by 2029, but could be further delayed. Since 2018, Southern Power has been utilizing tax equity partnerships for wind, solar, and battery energy storage projects, where the tax equity partner takes significantly all of the respective federal tax benefits. These tax equity partnerships are consolidated in Southern Company's and Southern Power's financial statements using the HLBV methodology to allocate partnership gains and losses.
In the third quarter 2023, Georgia Power started generating advanced nuclear PTCs for Plant Vogtle Unit 3 beginning on the in-service date of July 31, 2023. PTCs are recognized as an income tax benefit based on KWH production. In addition, pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 from the other Vogtle Owners. The gain recognized on the purchase of the joint owner PTCs is recognized as an income tax benefit. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information regarding Plant Vogtle Units 3 and 4.
See Note 1 to the financial statements under "General" for additional information on the HLBV methodology and Note 1 to the financial statements under "Income Taxes" and Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and "Effective Tax Rate" for additional information regarding utilization and amortization of credits and the tax benefit related to associated basis differences.
Inflation Reduction Act
In August 2022, the IRA was signed into law. The IRA extends, expands, and increases ITCs and PTCs for clean energy projects, allows PTCs for solar projects, adds ITCs for stand-alone energy storage projects with an option to elect out of the tax normalization requirement, and allows for the transferability of the tax credits. The IRA extends and increases the tax credits for carbon capture and sequestration projects and adds tax credits for clean hydrogen and nuclear projects. Additional ITC and PTC amounts are available if the projects meet domestic content requirements or are located in low-income or energy communities. The IRA also enacted a 15% corporate minimum tax on book income, with material adjustments for pension costs and tax depreciation. The 15% corporate minimum tax on book income can be reduced by energy tax credits.
For solar projects placed in service in 2022 through 2032, the IRA provides for a 30% ITC and an option to claim a PTC instead of an ITC. Starting in 2023 and through 2032, the IRA provides for a 30% ITC for stand-alone energy storage projects. For wind projects placed in service in 2022 through 2032, the IRA provides for a 100% PTC, adjusted for inflation annually. For projects placed in service before 2022, the 2023 PTC rate is 2.8 cents per KWH. For projects placed in service in 2022 and later, the 2023 PTC rate is 2.75 cents per KWH. The same PTC rate applies for solar projects for which the PTC option has been elected. To realize the full value of ITCs and PTCs, the IRA requires satisfaction of prevailing wage and apprenticeship requirements.
In June 2023, the IRS issued temporary regulations related to the transferability of tax credits. During the fourth quarter 2023, Southern Power executed an agreement to transfer certain PTCs generated in 2023. The discount recognized was booked through income tax expense and was immaterial. Southern Company and certain subsidiaries are considering the sale of additional tax credits that are eligible to be transferred.
Implementation of the IRA provisions is subject to the issuance of additional guidance by the U.S. Treasury Department and the IRS. The Registrants are still evaluating the impacts and the ultimate outcome of this matter cannot be determined at this time.
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Natural Gas Safe Harbor Method
In April 2023, the IRS issued Revenue Procedure 2023-15, which provides a safe harbor tax method of accounting that taxpayers may use to determine whether certain expenditures to maintain, repair, replace, or improve natural gas transmission and distribution property must be capitalized or allowed as repair deductions. The revenue procedure allows multiple alternatives for implementation which will result in a tax accounting method change for Southern Company Gas' eligible expenditures. Due to the complexity of analysis needed and the various implementation options allowed under the revenue procedure, Southern Company and Southern Company Gas are still evaluating the impacts and the ultimate outcome of this matter cannot be determined at this time. See Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" for additional information.
General Litigation and Other Matters
The Registrants are involved in various matters being litigated and/or regulatory and other matters that could affect future earnings, cash flows, and/or financial condition. The ultimate outcome of such pending or potential litigation against each Registrant and any subsidiaries or regulatory and other matters cannot be determined at this time; however, for current proceedings and/or matters not specifically reported herein or in Notes 82 and 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings and/or matters would have a material effect on such Registrant's financial statements. See Notes 2 and 3 to the financial statements for a discussion of various contingencies, including matters being litigated, regulatory matters, and other matters which may affect future earnings potential.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Registrants prepare their financial statements in accordance with GAAP, which requires the use of estimates, judgments, and assumptions. Significant accounting policies are described in the notes to the financial statements. Detailed further herein are certain estimates made in the application of these policies that may have a material impact on the results of operations, financial condition, and related disclosures of the applicable Registrants (as indicated in the section descriptions herein). Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed these critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Utility Regulation (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
The traditional electric operating companies and the natural gas distribution utilities are subject to retail regulation by their respective state PSCs or other applicable state regulatory agencies and wholesale regulation by the FERC. These regulatory agencies set the rates the traditional electric operating companies and the natural gas distribution utilities are permitted to charge customers based on allowable costs, including a reasonable ROE. As a result, the traditional electric operating companies and the natural gas distribution utilities apply accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards for rate regulated entities also impacts their financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the traditional electric operating companies and the natural gas distribution utilities; therefore, the accounting estimates inherent in specific costs such as depreciation, AROs, and pension and other postretirement benefits have less of a direct impact on the results of operations and financial condition of the applicable Registrants than they would on a non-regulated company. Additionally, a regulatory agency may disallow recovery of all or a portion of certain assets. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for information regarding the disallowance of certain capital investments at Nicor Gas and "Estimated Cost, Schedule, and Rate Recovery for the Construction of Plant Vogtle Units 3 and 4" herein for information regarding the Prudency Stipulation related to Georgia Power's construction of Plant Vogtle Units 3 and 4.
Revenues related to regulated utility operations as a percentage of total operating revenues in 2023 for the applicable Registrants were as follows: 89% for Southern Company, 98% for Alabama Power, 96% for Georgia Power, 99% for Mississippi Power, and 87% for Southern Company Gas.
As reflected in Note 2 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact
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the amounts of such regulatory assets and liabilities and could adversely impact the financial statements of the applicable Registrants.
Estimated Cost, Schedule, and Rate Recovery for the Construction of Plant Vogtle Units 3 and 4
(Southern Company and Georgia Power)
In 2016, the Georgia PSC approved a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with Georgia Power's fifteenth VCM report. In January 2018, the Georgia PSC issued an order approving Georgia Power's seventeenth VCM report, which included a modification of the Vogtle Cost Settlement Agreement. The January 2018 order and the modified Vogtle Cost Settlement Agreement resolved certain regulatory matters related to Plant Vogtle Units 3 and 4 including, but not limited to: (i) Georgia Power's total project capital cost forecast of $7.3 billion (net of $1.7 billion received under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds) was found reasonable and (ii) a prudence proceeding on cost recovery would occur subsequent to achieving fuel load for Unit 4. On December 19, 2023, the Georgia PSC voted to approve Georgia Power's Application as modified by the Prudency Stipulation. Under the terms of the approved Prudency Stipulation, Georgia Power will recover $7.562 billion in total construction and capital costs and associated retail rate base items of $1.02 billion, which includes AFUDC financing costs above $4.418 billion (the Georgia PSC-certified amount) up to $7.562 billion. The approval of the Application and the Prudency Stipulation resolves all issues for determination by the Georgia PSC regarding the reasonableness, prudence, and cost recovery for the remaining Plant Vogtle Units 3 and 4 construction and capital costs not already in retail base rates.
As of December 31, 2023, Georgia Power revised its total project capital cost forecast to $10.8 billion (net of $1.7 billion received under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds). This forecast includes construction contingency of $36 million and is based on the actual in-service date of July 2023 for Unit 3 and a projected in-service date during the second quarter 2024 for Unit 4. Since 2018, established construction contingency and additional costs totaling $2.7 billion have been assigned to the base capital cost forecast. Georgia Power did not seek rate recovery for the $0.7 billion increase to the base capital cost forecast included in the nineteenth VCM report and charged to income by Georgia Power in the second quarter 2018 and, until the prudency proceeding described above, did not seek rate recovery for subsequent construction and additional contingency costs assigned to the base capital cost forecast. After considering the significant level of uncertainty that existed regarding the future recoverability of these costs since the ultimate outcome of these matters was subject to the outcome of assessments by management, as well as Georgia PSC decisions in the related regulatory proceedings, Georgia Power recorded total pre-tax charges to income of $1.1 billion ($0.8 billion after tax) in 2018; $149 million ($111 million after tax) and $176 million ($131 million after tax) in the second quarter and the fourth quarter 2020, respectively; $48 million ($36 million after tax), $460 million ($343 million after tax), $264 million ($197 million after tax), and $480 million ($358 million after tax) in the first quarter 2021, the second quarter 2021, the third quarter 2021, and the fourth quarter 2021, respectively; and $36 million ($27 million after tax), $32 million ($24 million after tax), and $148 million ($110 million after tax) in the second quarter 2022, the third quarter 2022, and the fourth quarter 2022, respectively. As a result of the Georgia PSC's approval of the Prudency Stipulation, Georgia Power recorded a pre-tax credit to income of approximately $228 million ($170 million after tax) in the fourth quarter 2023 to recognize CWIP costs previously charged to income, which are now recoverable through retail rates. Associated AFUDC on these costs was also recognized.
In September 2022, Georgia Power and MEAG Power reached an agreement to resolve a dispute regarding the cost-sharing and tender provisions of the Global Amendments (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"). Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project capital cost forecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the current project capital cost forecast, with no further adjustment for force majeure costs.
On October 5, 2023 and October 17, 2023, Georgia Power reached agreements with OPC and Dalton, respectively, to resolve its respective dispute with each of OPC and Dalton regarding the cost-sharing and tender provisions of the Global Amendments. Under the terms of the agreements with OPC and Dalton, among other items, (i) each of OPC and Dalton retracted its exercise of the tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4, (ii) Georgia Power made payments immediately after execution of the agreements of $308 million and $17 million to OPC and Dalton, respectively, representing payment for a portion of each of OPC's and Dalton's costs of construction for Plant Vogtle Units 3 and 4 previously incurred, (iii) Georgia Power will pay a portion of each of OPC's and Dalton's further costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will be in an aggregate amount of approximately $105 million and $6 million for OPC and Dalton, respectively, based on the current project capital cost forecast,
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and (iv) Georgia Power will pay 66% of each of OPC's and Dalton's costs of construction with respect to any amounts above the current project capital cost forecast, with no further adjustment for force majeure costs.
Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing provisions of the Global Amendments, including the settlement with MEAG Power. Based on the current project capital cost forecast and the settlements with OPC and Dalton described above, Georgia Power recorded a pre-tax charge to income of approximately $160 million ($120 million after tax) in the third quarter 2023. These charges are included in the total project capital cost forecast and will not be recovered from retail customers.
As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts for Unit 4 on a regular basis to incorporate current information available, particularly in the areas of start-up testing and related test results and engineering support.
The projected schedule for Unit 4 significantly depends on the progression of start-up and pre-operational testing, which may be impacted by equipment or other operational failures. Any further delays could result in a later in-service date and cost increases.
Various design and other licensing-based compliance matters may result in additional license amendment requests or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the Unit 4 project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time. However, any extension of the in-service date beyond June 2024 for Unit 4, including the current level of cost sharing described in Note 2, is estimated to result in additional base capital costs for Georgia Power of up to $25 million per month as well as any additional related construction, support resources, or testing costs. Pursuant to the Prudency Stipulation, any further changes to the capital cost forecast will not be recoverable through regulated rates and will be required to be charged to income, and such charges could be material.
Given the significant complexity involved in estimating the future costs to complete construction and start-up of Plant Vogtle Unit 4, as well as the potential impact on results of operations and cash flows, Southern Company and Georgia Power consider these items to be critical accounting estimates. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Accounting for Income Taxes (Southern Company, Georgia Power, Mississippi Power, Southern Power, and Southern Company Gas)
The consolidated income tax provision and deferred income tax assets and liabilities, as well as any unrecognized tax benefits and valuation allowances, require significant judgment and estimates. These estimates are supported by historical tax return data, reasonable projections of taxable income, the ability and intent to implement tax planning strategies if necessary, and interpretations of applicable tax laws and regulations across multiple taxing jurisdictions. The effective tax rate reflects the statutory tax rates and calculated apportionments for the various states in which the Southern Company system operates.
Southern Company files a consolidated federal income tax return and the Registrants file various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and each subsidiary is allocated an amount of tax similar to that which would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability. Certain deductions and credits can be limited or utilized at the consolidated or combined level resulting in tax credit and/or state NOL carryforwards that would not otherwise result on a stand-alone basis. Utilization of these carryforwards and the assessment of valuation allowances are based on significant judgment and extensive analysis of Southern Company's and its subsidiaries' current financial position and results of operations, including currently available information about future years, to estimate when future taxable income will be realized. See Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and " – Net Operating Loss Carryforwards" for additional information.
Current and deferred state income tax liabilities and assets are estimated based on laws of multiple states that determine the income to be apportioned to their jurisdictions. States have various filing methodologies and utilize specific formulas to calculate the apportionment of taxable income. The calculation of deferred state taxes considers apportionment factors and filing methodologies that are expected to apply in future years. Any apportionments and/or filing methodologies ultimately finalized in a manner inconsistent with expectations could have a material effect on the financial statements of the applicable Registrants.
Asset Retirement Obligations (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
Estimating AROs requires significant judgment. AROs are computed as the present value of the estimated costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the
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related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities.
The ARO liabilities for the traditional electric operating companies primarily relate to facilities that are subject to the CCR Rule and the related state rules, principally ash ponds. In addition, Alabama Power and Georgia Power have retirement obligations related to the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 through 3). Other significant AROs include various landfill sites and asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power.
The traditional electric operating companies and Southern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company system's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for certain retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these retirement obligations will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.
The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule and the related state rules. The traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to these assumptions becomes available. Some of these updates have been, and future updates may be, material. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. See Note 6 to the financial statements and FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein for additional information, including updates to AROs related to ash ponds recorded during 2023 by certain Registrants.
Pension and Other Postretirement Benefits (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
The applicable Registrants' calculations of pension and other postretirement benefits expense are dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term rate of return (LRR) on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the applicable Registrants believe the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect their pension and other postretirement benefit costs and obligations.
Key elements in determining the applicable Registrants' pension and other postretirement benefit expense are the LRR and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. For purposes of determining the applicable Registrants' liabilities related to the pension and other postretirement benefit plans, Southern Company discounts the future related cash flows using a single-point discount rate for each plan developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. The discount rate assumption impacts both the service cost and non-service costs components of net periodic benefit costs as well as the projected benefit obligations.
The LRR on pension and other postretirement benefit plan assets is based on Southern Company's investment strategy, as described in Note 11 to the financial statements, historical experience, and expectations that consider external actuarial advice, and represents the average rate of earnings expected over the long term on the assets invested to provide for anticipated future benefit payments. Southern Company determines the amount of the expected return on plan assets component of non-service costs by applying the LRR of various asset classes to Southern Company's target asset allocation. The LRR only impacts the non-service costs component of net periodic benefit costs for the following year and is set annually at the beginning of the year.
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The following table illustrates the sensitivity to changes in the applicable Registrants' long-term assumptions with respect to the discount rate, salary increases, and the long-term rate of return on plan assets:
Increase/(Decrease) in
25 Basis Point Change in:Total Benefit Expense for 2024Projected Obligation for Pension Plan at December 31, 2023
Projected Obligation for
Other Postretirement
Benefit Plans at December 31, 2023
(in millions)
Discount rate:
Southern Company$35/$(32)$419/$(397)$34/$(32)
Alabama Power$9/$(9)$101/$(96)$9/$(8)
Georgia Power$9/$(9)$122/$(116)$11/$(11)
Mississippi Power$2/$(1)$18/$(18)$1/$(1)
Southern Company Gas$2/$(2)$27/$(25)$4/$(4)
Salaries:
Southern Company$18/$(17)$87/$(84)$–/$–
Alabama Power$5/(5)$24/$(23)$–/$–
Georgia Power$5/(5)$23/$(23)$–/$–
Mississippi Power$1/$(1)$4/$(4)$–/$–
Southern Company Gas$1/$(1)$3/$(3)$–/$–
Long-term return on plan assets:
Southern Company$41/$(41)N/AN/A
Alabama Power$10/$(10)N/AN/A
Georgia Power$13/$(13)N/AN/A
Mississippi Power$2/$(2)N/AN/A
Southern Company Gas$3/$(3)N/AN/A
See Note 11 to the financial statements for additional information regarding pension and other postretirement benefits.
Impairment (Southern Company, Southern Power, and Southern Company Gas)
Goodwill (Southern Company and Southern Company Gas)
The acquisition method of accounting for business combinations requires the assets acquired and liabilities assumed to be recorded at the date of acquisition at their respective estimated fair values. The applicable Registrants have recognized goodwill as of the date of their acquisitions, as a residual over the fair values of the identifiable net assets acquired. Goodwill is recorded at the reporting unit level, which is the operating segment or a business one level below the operating segment (a component), if discrete financial information is prepared and regularly reviewed by management. Components are aggregated if they have similar economic characteristics. Goodwill is tested for impairment at the reporting unit level on an annual basis in the fourth quarter of the year and on an interim basis if events and circumstances occur that indicate goodwill may be impaired.
Goodwill is evaluated for impairment either under the qualitative assessment option or the quantitative option to determine the fair value of the reporting unit. If goodwill is determined to be impaired, an impairment loss measured at the amount by which the reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill, is recorded.
Goodwill for Southern Company and Southern Company Gas was $5.2 billion and $5.0 billion, respectively, at December 31, 2023. During 2022, Southern Company recorded a $119 million impairment loss as a result of its annual goodwill impairment test for PowerSecure.
The judgments made in determining the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can significantly impact the applicable Registrant's results of operations. Fair values and useful lives are determined based on, among other factors, the expected future period of benefit of the asset, the various characteristics of the asset, and projected cash flows. As the determination of an asset's fair value and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the applicable Registrants consider these estimates to be critical accounting estimates.
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See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information regarding the applicable Registrants' goodwill.
Long-Lived Assets (Southern Company, Southern Power, and Southern Company Gas)
The applicable Registrants assess their other long-lived assets for impairment whenever events or changes in circumstances indicate that an asset's carrying amount may not be recoverable. If an impairment indicator exists, the asset is tested for recoverability by comparing the asset carrying amount to the sum of the undiscounted expected future cash flows directly attributable to the asset's use and eventual disposition. If the estimate of undiscounted future cash flows is less than the carrying amount of the asset, the fair value of the asset is determined and a loss is recorded equal to the difference between the carrying amount and the fair value of the asset. In addition, when assets are identified as held for sale, an impairment loss is recognized to the extent the carrying amount of the assets or asset group exceeds their fair value less cost to sell. A high degree of judgment is required in developing estimates related to these evaluations, which are based on projections of various factors, some of which have been quite volatile in recent years.
Southern Power's investments in long-lived assets are primarily generation assets. Excluding the natural gas distribution utilities, Southern Company Gas' investments in long-lived assets are primarily natural gas transportation assets.
For Southern Power, examples of impairment indicators could include, but are not limited to, significant changes in construction schedules, current period losses combined with a history of losses or a projection of continuing losses, a significant decrease in market prices, changes in tax legislation, the inability to remarket generating capacity for an extended period, the unplanned termination of a customer contract, or the inability of a customer to perform under the terms of the contract. For Southern Company Gas, examples of impairment indicators could include, but are not limited to, significant changes in the U.S. natural gas storage market, construction schedules, current period losses combined with a history of losses or a projection of continuing losses, a significant decrease in market prices, the inability to renew or extend customer contracts or the inability of a customer to perform under the terms of the contract, attrition rates, or the inability to deploy a development project.
As the determination of the expected future cash flows generated from an asset, an asset's fair value, and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the applicable Registrants consider these estimates to be critical accounting estimates.
During 2021, Southern Company recorded impairment charges totaling $7 million ($6 million after tax) related to its leveraged lease investments. During 2022, Southern Company Gas recorded pre-tax impairment charges totaling $131 million ($99 million after tax) related to natural gas storage facilities. During 2021, Southern Company Gas recorded total pre-tax impairment charges of $84 million ($67 million after tax) related to its equity method investment in the PennEast Pipeline project. See Notes 7 and 9 to the financial statements under "Southern Company Gas" and "Southern Company Leveraged Lease," respectively, and Note 15 to the financial statements for additional information on recent asset impairments.
Revenue Recognition (Southern Power)
Southern Power's power sale transactions, which include PPAs, are classified in one of four general categories: leases, normal sale derivatives or contracts with customers, derivatives designated as cash flow hedges, and derivatives not designated as hedges. Southern Power's revenues are dependent upon significant judgments used to determine the appropriate transaction classification, which must be documented upon the inception of each contract. The two categories with the most judgment required for Southern Power are described further below.
Lease Transactions
Southern Power considers the terms of a sales contract to determine whether it should be accounted for as a lease. A contract is or contains a lease if the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in Item 8 herein.exchange for consideration. If the contract meets the criteria for a lease, Southern Power performs further analysis to determine whether the lease is classified as operating, financing, or sales-type. Generally, Southern Power's power sales contracts that are determined to be leases are accounted for as operating leases and the capacity revenue is recognized on a straight-line basis over the term of the contract and is included in Southern Power's operating revenues. Energy revenues and other contingent revenues are recognized in the period the energy is delivered or the service is rendered. For those contracts that are determined to be sales-type leases, capacity revenues are recognized by accounting for interest income on the net investment in the lease and are included in Southern Power's operating revenues. See Note 9 to the financial statements for additional information.
Normal Sale Derivative Transactions and Contracts with Customers
If the power sales contract is not classified as a lease, Southern Power further considers whether the contract meets the definition of a derivative. If the contract does meet the definition of a derivative, Southern Power will assess whether it can be designated as
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Item 8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
a normal sale contract. The determination of whether a contract can be designated as a normal sale contract requires judgment, including whether the sale of electricity involves physical delivery in quantities within Southern Power's available generating capacity and that the purchaser will take quantities expected to be used or sold in the normal course of business.
INDEX TO 2017 Contracts that do not meet the definition of a derivative or are designated as normal sales are accounted for as revenue from contracts with customers. For contracts that have a capacity charge, the revenue is generally recognized in the period that it becomes billable. Revenues related to energy and ancillary services are recognized in the period the energy is delivered or the service is rendered. See Note 4 to the financial statements for additional information.
Acquisition Accounting (Southern Power)
Southern Power may acquire generation assets as part of its overall growth strategy. At the time of an acquisition, Southern Power will assess if these assets and activities meet the definition of a business. Acquisitions that meet the definition of a business are accounted for under the acquisition method, whereby the identifiable assets acquired, liabilities assumed, and any noncontrolling interests (including any intangible assets, primarily related to acquired PPAs) are recognized and measured at fair value. Assets acquired that do not meet the definition of a business are accounted for as an asset acquisition. The purchase price of each asset acquisition is allocated based on the relative fair value of assets acquired.
Determining the fair value of assets acquired and liabilities assumed requires management judgment and Southern Power may engage independent valuation experts to assist in this process. Fair values are determined by using market participant assumptions and typically include the timing and amounts of future cash flows, incurred construction costs, the nature of acquired contracts, discount rates, power market prices, and expected asset lives. For potential or successful acquisitions that meet the definition of a business, any due diligence or transaction costs incurred are expensed as incurred. If the acquisition is an asset acquisition, direct and incremental transaction costs can be capitalized as a component of the cost of the assets acquired.
See Note 13 to the financial statements for additional fair value information and Note 15 to the financial statements for additional information on recent acquisitions.
Variable Interest Entities (Southern Power)
Southern Power enters into partnerships with varying ownership structures. Upon entering into these arrangements, membership interests and other variable interests are evaluated to determine if the legal entity is a VIE. If the legal entity is a VIE, Southern Power will assess if it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE, making it the primary beneficiary. Making this determination may require significant management judgment.
If Southern Power is the primary beneficiary and is considered to have a controlling ownership, the assets, liabilities, and results of operations of the entity are consolidated. If Southern Power is not the primary beneficiary, the legal entity is generally accounted for under the equity method of accounting. Southern Power reconsiders its conclusions as to whether the legal entity is a VIE and whether it is the primary beneficiary for events that impact the rights of variable interests, such as ownership changes in membership interests.
Southern Power has controlling ownership in certain legal entities for which the contractual provisions represent profit-sharing arrangements because the allocations of cash distributions and tax benefits are not based on fixed ownership percentages. For these arrangements, the noncontrolling interest is accounted for under a balance sheet approach utilizing the HLBV method. The HLBV method calculates each partner's share of income based on the change in net equity the partner can legally claim in a HLBV at the end of the period compared to the beginning of the period.
Contingent Obligations (All Registrants)
The Registrants are subject to a number of federal and state laws and regulations, as well as other factors and conditions that subject them to environmental, litigation, and other risks. See FUTURE EARNINGS POTENTIAL herein and Notes 2 and 3 to the financial statements for more information regarding certain of these contingencies. The Registrants periodically evaluate their exposure to such risks and record reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the results of operations, cash flows, or financial condition of the Registrants.
Recently Issued Accounting Standards
See Note 1 to the financial statements under "Recently Adopted Accounting Standards" for additional information.
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FINANCIAL CONDITION AND LIQUIDITY
Overview
The financial condition of each Registrant remained stable at December 31, 2023. The Registrants' cash requirements primarily consist of funding ongoing operations, including unconsolidated subsidiaries, as well as common stock dividends, capital expenditures, and debt maturities. Southern Power's cash requirements also include distributions to noncontrolling interests. Capital expenditures and other investing activities for the traditional electric operating companies include investments to build new generation facilities to meet projected long-term demand requirements and to replace units being retired as part of the generation fleet transition, to maintain existing generation facilities, to comply with environmental regulations including adding environmental modifications to certain existing generating units and closures of ash ponds, to expand and improve transmission and distribution facilities, and for restoration following major storms. Southern Power's capital expenditures and other investing activities may include acquisitions or new construction associated with its overall growth strategy and to maintain its existing generation fleet's performance. Southern Company Gas' capital expenditures and other investing activities include investments to meet projected long-term demand requirements, to maintain existing natural gas distribution systems as well as to update and expand these systems, and to comply with environmental regulations. See "Cash Requirements" herein for additional information.
Operating cash flows provide a substantial portion of the Registrants' cash needs. During 2023, Southern Power utilized tax credits, which provided $332 million in operating cash flows. For the three-year period from 2024 through 2026, projected stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows for each of Southern Company, the traditional electric operating companies, and Southern Company Gas. Southern Company plans to finance future cash needs in excess of its operating cash flows through one or more of the following: accessing borrowings from financial institutions, issuing debt and hybrid securities in the capital markets, and/or through its stock plans. Each Subsidiary Registrant plans to finance its future cash needs in excess of its operating cash flows primarily through external securities issuances, borrowings from financial institutions, and equity contributions from Southern Company. In addition, Southern Power may utilize tax equity partnership contributions. The Registrants plan to use commercial paper to manage seasonal variations in operating cash flows and for other working capital needs and continue to monitor their access to short-term and long-term capital markets as well as their bank credit arrangements to meet future capital and liquidity needs. See "Sources of Capital" and "Financing Activities" herein for additional information.
The Registrants' investments in their qualified pension plans and Alabama Power's and Georgia Power's investments in their nuclear decommissioning trust funds increased in value at December 31, 2023 as compared to December 31, 2022. No contributions to the qualified pension plan were made during 2023 and no mandatory contributions to the qualified pension plans are anticipated during 2024. See Notes 6 and 11 to the financial statements under "Nuclear Decommissioning" and "Pension Plans," respectively, for additional information.
At the end of 2023, the market price of Southern Company's common stock was $70.12 per share (based on the closing price as reported on the NYSE) and the book value was $28.83 per share, representing a market-to-book value ratio of 243%, compared to $71.41, $27.93, and 256%, respectively, at the end of 2022.
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Cash Requirements
Capital Expenditures
Total estimated capital expenditures, including LTSA and nuclear fuel commitments, for the Registrants through 2028 based on their current construction programs are as follows:
20242025202620272028
(in billions)
Southern Company(a)(b)
$10.0 $9.4 $8.5 $8.6 $8.7 
Alabama Power2.1 2.0 1.9 2.0 1.9 
Georgia Power(a)
5.4 5.0 4.4 4.5 4.7 
Mississippi Power0.3 0.3 0.2 0.3 0.3 
Southern Power(b)
0.3 0.2 0.1 0.1 0.1 
Southern Company Gas1.8 1.8 1.7 1.7 1.7 
(a)Includes expenditures of approximately $0.2 billion in 2024 for the construction of Plant Vogtle Unit 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information. Also includes certain expenditures related to the construction of Plant Yates Units 8 through 10 as requested in Georgia Power's 2023 IRP Update filing, which is subject to the approval of the Georgia PSC. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
(b)Includes $0.1 billion in both 2024 and 2025 related to the South Cheyenne and Millers Branch solar projects. Excludes approximately $0.8 billion annually for Southern Power's planned acquisitions and placeholder growth, which may vary materially due to market opportunities and Southern Power's ability to execute its growth strategy. Also excludes estimated capital expenditures associated with the phase two expansion of the Millers Branch solar project, which was committed to subsequent to December 31, 2023. See Note 15 to the financial statements under "Southern Power" for additional information regarding the South Cheyenne and Millers Branch solar projects.
These capital expenditures include estimates to comply with environmental laws and regulations, but do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See FUTURE EARNINGS POTENTIAL – "Environmental Matters" herein for additional information. At December 31, 2023, significant purchase commitments were outstanding in connection with the Registrants' construction programs.
The traditional electric operating companies also anticipate continued expenditures associated with closure and monitoring of ash ponds and landfills in accordance with the CCR Rule and the related state rules, which are reflected in the applicable Registrants' ARO liabilities. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. These estimated costs are likely to change, and could change materially, as assumptions and details pertaining to closure are refined and compliance activities continue. Current estimates of these costs through 2028 are provided in the table below. Material expenditures in future years for ARO settlements will also be required for ash ponds, nuclear decommissioning (for Alabama Power and Georgia Power), and other liabilities reflected in the applicable Registrants' AROs, as discussed further in Note 6 to the financial statements. Also see FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein.
20242025202620272028
(in millions)
Southern Company$728 $767 $762 $725 $669 
Alabama Power346 364 299 237 216 
Georgia Power338 347 429 450 450 
Mississippi Power24 30 17 
The construction programs are subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; changes in environmental laws and regulations; the outcome of any legal challenges to environmental rules; changes in electric generating plants, including unit retirements and replacements and adding or changing fuel sources at existing electric generating units, to meet regulatory requirements; changes in FERC rules and regulations; state regulatory agency approvals; changes in the expected environmental compliance program; changes in legislation and/or regulation; the cost, availability, and efficiency of construction labor, equipment, and materials; project scope and design changes; abnormal weather; delays in construction due to judicial or regulatory action; storm impacts; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures and AROs will be fully recovered. Additionally, expenditures associated with Southern Power's planned
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acquisitions may vary due to market opportunities and the execution of its growth strategy. See Note 15 to the financial statements under "Southern Power" for additional information regarding Southern Power's plant acquisitions and construction projects.
The construction program of Georgia Power includes Plant Vogtle Unit 4, which includes components based on new technology that only within the last several years began initial operation in the global nuclear industry at this scale and which may be subject to additional revised cost estimates during construction. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for information regarding Plant Vogtle Unit 4 and additional factors that may impact construction expenditures.
See FUTURE EARNINGS POTENTIAL – "Construction Programs" herein for additional information.
Other Significant Cash Requirements
Long-term debt maturities and the interest payable on long-term debt each represent a significant cash requirement for the Registrants. See Note 8 to the financial statements for information regarding the Registrants' long-term debt at December 31, 2023, the weighted average interest rate applicable to each long-term debt category, and a schedule of long-term debt maturities over the next five years. The Registrants plan to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Fuel and purchased power costs represent a significant component of funding ongoing operations for the traditional electric operating companies and Southern Power. See Note 3 to the financial statements under "Commitments" for information on Southern Company Gas' commitments for pipeline charges, storage capacity, and gas supply. Total estimated costs for fuel and purchased power commitments at December 31, 2023 for the applicable Registrants are provided in the table below. Fuel costs include purchases of coal (for the traditional electric operating companies) and natural gas (for the traditional electric operating companies and Southern Power), as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery; the amounts reflected below have been estimated based on the NYMEX future prices at December 31, 2023. As discussed under "Capital Expenditures" herein, estimated expenditures for nuclear fuel are included in the applicable Registrants' construction programs for the years 2024 through 2028. Nuclear fuel commitments at December 31, 2023 that extend beyond 2028 are included in the table below. Purchased power costs represent estimated minimum obligations for various PPAs for the purchase of capacity and energy, except for those accounted for as leases, which are discussed in Note 9 to the financial statements.
20242025202620272028Thereafter
(in millions)
Southern Company(*)
$3,347 $3,151 $2,201 $1,738 $1,171 $4,820 
Alabama Power1,210 1,181 819 619 328 1,136 
Georgia Power(*)
1,262 1,111 696 579 471 2,008 
Mississippi Power377 420 338 263 213 1,002 
Southern Power558 502 414 346 232 674 
(*)Excludes capacity payments related to Plant Vogtle Units 1 and 2, which are discussed in Note 3 to the financial statements under "Commitments."
In connection with Georgia Power's 2022 IRP, the Georgia PSC approved five affiliate PPAs with Southern Power, which are expected to be accounted for as leases, and are contingent upon approval by the FERC. The expected capacity payments associated with the PPAs total $5 million in 2024, $68 million in 2025, $75 million in 2026, $76 million in 2027, $86 million in 2028, and $584 million thereafter. In connection with Georgia Power's 2023 IRP Update, Georgia Power has requested certification of a non-affiliate PPA, which is expected to be accounted for as a lease and is contingent upon approval by the Georgia PSC. The expected capacity payments associated with the PPA are $10 million in 2024, $17 million in 2025, $18 million in 2026, $19 million in 2027, and $19 million in 2028. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
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The traditional electric operating companies and Southern Power have entered into LTSAs for the purpose of securing maintenance support for certain of their generating facilities. See Note 1 to the financial statements under "Long-term Service Agreements" for additional information. As discussed under "Capital Expenditures" herein, estimated expenditures related to LTSAs are included in the applicable Registrants' construction programs for the years 2024 through 2028. Total estimated payments for LTSA commitments at December 31, 2023 that extend beyond 2028 are provided in the following table and include price escalation based on inflation indices:
Southern
Company
Alabama PowerGeorgia
Power
Mississippi PowerSouthern Power
(in millions)
LTSA commitments (after 2028)$1,594 $262 $252 $152 $928 
In addition, Southern Power has certain other operations and maintenance agreements. Total estimated costs for these commitments at December 31, 2023 are provided in the table below.
20242025202620272028Thereafter
(in millions)
Southern Power's operations and maintenance agreements$74 $45 $33 $30 $30 $226 
See Note 9 to the financial statements for information on the Registrants' operating lease obligations, including a maturity analysis of the lease liabilities over the next five years and thereafter.
Sources of Capital
Southern Company intends to meet its future capital needs through operating cash flows, borrowings from financial institutions, and debt, hybrid, and/or equity issuances. Equity capital can be provided from any combination of Southern Company's stock plans, private placements, or public offerings.
The Subsidiary Registrants plan to obtain the funds to meet their future capital needs from sources similar to those they used in the past, which were primarily from operating cash flows, external securities issuances, borrowings from financial institutions, and equity contributions from Southern Company. Operating cash flows provide a substantial portion of the Registrants' cash needs. Georgia Power intends to utilize a mix of senior note issuances, short-term floating rate bank loans, and commercial paper issuances to continue funding operating cash flows related to fuel cost under recovery.
The amount, type, and timing of any financings in 2024, as well as in subsequent years, will be contingent on investment opportunities and the Registrants' capital requirements and will depend upon prevailing market conditions, regulatory approvals (for certain of the Subsidiary Registrants), and other factors. See "Cash Requirements" herein for additional information.
Southern Power utilizes tax equity partnerships as one of its financing sources, where the tax partner takes significantly all of the federal tax benefits. These tax equity partnerships are consolidated in Southern Power's financial statements and are accounted for using HLBV methodology to allocate partnership gains and losses. During 2023, Southern Power obtained tax equity funding for existing tax equity partnerships totaling $21 million. See Notes 1 and 15 to the financial statements under "General" and "Southern Power," respectively, for additional information.
The issuance of securities by the traditional electric operating companies and Nicor Gas is generally subject to the approval of the applicable state PSC or other applicable state regulatory agency. The issuance of all securities by Mississippi Power and short-term securities by Georgia Power is generally subject to regulatory approval by the FERC. Additionally, with respect to the public offering of securities, Southern Company, the traditional electric operating companies, and Southern Power (excluding its subsidiaries), Southern Company Gas Capital, and Southern Company Gas (excluding its other subsidiaries) file registration statements with the SEC under the Securities Act of 1933, as amended (1933 Act). The amounts of securities authorized by the appropriate regulatory authorities, as well as the securities registered under the 1933 Act, are closely monitored and appropriate filings are made to ensure flexibility in the capital markets.
The Registrants generally obtain financing separately without credit support from any affiliate. See Note 8 to the financial statements under "Bank Credit Arrangements" for additional information. The Southern Company system does not maintain a centralized cash or money pool. Therefore, funds of each company are not commingled with funds of any other company in the Southern Company system, except in the case of Southern Company Gas, as described below.
The traditional electric operating companies and SEGCO may utilize a Southern Company subsidiary organized to issue and sell commercial paper at their request and for their benefit. Proceeds from such issuances for the benefit of an individual company are loaned directly to that company. The obligations of each traditional electric operating company and SEGCO under these
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arrangements are several and there is no cross-affiliate credit support. Alabama Power also maintains its own separate commercial paper program.
Southern Company Gas Capital obtains external financing for Southern Company Gas and its subsidiaries, other than Nicor Gas, which obtains financing separately without credit support from any affiliates. Southern Company Gas maintains commercial paper programs at Southern Company Gas Capital and Nicor Gas. Nicor Gas' commercial paper program supports its working capital needs as Nicor Gas is not permitted to make money pool loans to affiliates. All of the other Southern Company Gas subsidiaries benefit from Southern Company Gas Capital's commercial paper program.
By regulation, Nicor Gas is restricted, up to its retained earnings balance, in the amount it can dividend or loan to affiliates and is not permitted to make money pool loans to affiliates. At December 31, 2023, the amount of subsidiary retained earnings restricted to dividend totaled $1.7 billion. This restriction did not impact Southern Company Gas' ability to meet its cash obligations, nor does management expect such restriction to materially impact Southern Company Gas' ability to meet its currently anticipated cash obligations.
Certain Registrants' current liabilities frequently exceed their current assets because of long-term debt maturities and the periodic use of short-term debt as a funding source, as well as significant seasonal fluctuations in cash needs. The Registrants generally plan to refinance long-term debt as it matures. See Note 8 to the financial statements for additional information. Also see "Financing Activities" herein for information on financing activities that occurred subsequent to December 31, 2023. The following table shows the amount by which current liabilities exceeded current assets at December 31, 2023 for the applicable Registrants:
At December 31, 2023Southern
Company
Georgia
Power
Mississippi PowerSouthern Company Gas
(in millions)
Current liabilities in excess of current assets$3,035 $1,674 $314 $222 
The Registrants believe the need for working capital can be adequately met by utilizing operating cash flows, as well as commercial paper, lines of credit, and short-term bank notes, as market conditions permit. In addition, under certain circumstances, the Subsidiary Registrants may utilize equity contributions and/or loans from Southern Company.
Bank Credit Arrangements
At December 31, 2023, the Registrants' unused committed credit arrangements with banks were as follows:
At December 31, 2023Southern
Company
parent
Alabama PowerGeorgia
Power
Mississippi Power
Southern
 Power(a)
Southern Company Gas(b)
SEGCOSouthern
Company
(in millions)
Unused committed credit$1,998 $1,350 $1,726 $275 $589 $1,598 $30 $7,566 
(a)At December 31, 2023, Southern Power also had two continuing letters of credit facilities for standby letters of credit, of which $15 million was unused. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities.
(b)Includes $798 million and $800 million at Southern Company Gas Capital and Nicor Gas, respectively.
Subject to applicable market conditions, the Registrants, Nicor Gas, and SEGCO expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, the Registrants, Nicor Gas, and SEGCO may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
A portion of the unused credit with banks is allocated to provide liquidity support to certain revenue bonds of the traditional electric operating companies and the commercial paper programs of the Registrants, Nicor Gas, and SEGCO. At December 31, 2023, outstanding variable rate demand revenue bonds of the traditional electric operating companies with allocated liquidity support totaled approximately $1.7 billion (comprised of approximately $818 million at Alabama Power, $819 million at Georgia Power, and $69 million at Mississippi Power). In addition, at December 31, 2023, Georgia Power had approximately $325 million of fixed rate revenue bonds outstanding that are required to be remarketed within the next 12 months. The variable rate demand revenue bonds and fixed rate revenue bonds required to be remarketed within the next 12 months are classified as long-term debt on the balance sheets as a result of available long-term committed credit.
See Note 8 to the financial statements under "Bank Credit Arrangements" for additional information.
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Short-term Borrowings
The Registrants, Nicor Gas, and SEGCO make short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above. Southern Power's subsidiaries are not issuers or obligors under its commercial paper program. Commercial paper and short-term bank term loans are included in notes payable in the balance sheets. Details of the Registrants' short-term borrowings were as follows:
Short-term Debt at the End of the Period
Amount
Outstanding
Weighted Average
Interest Rate
December 31,December 31,
202320222021202320222021
(in millions)
Southern Company$2,314 $2,609 $1,440 5.7 %4.9 %0.4 %
Alabama Power40 — — 5.5 — — 
Georgia Power1,329 1,600 — 5.9 5.0 — 
Southern Power138 225 211 5.5 4.7 0.3 
Southern Company Gas:
Southern Company Gas Capital$23 $285 $379 5.5 %4.8 %0.3 %
Nicor Gas392 483 830 5.5 4.7 0.4 
Southern Company Gas Total$415 $768 $1,209 5.5 %4.7 %0.4 %
Short-term Debt During the Period(*)
Average Amount OutstandingWeighted Average
Interest Rate
Maximum Amount Outstanding
202320222021202320222021202320222021
(in millions)(in millions)
Southern Company$2,191 $1,995 $1,141 5.6 %2.2 %0.3 %$3,270 $2,894 $1,809 
Alabama Power44 27 5.0 2.1 0.1 230 200 200 
Georgia Power1,440 673 95 5.8 3.1 0.2 2,260 1,710 407 
Mississippi Power56 15 5.5 1.6 0.2 169 71 81 
Southern Power158 166 133 5.6 2.3 0.2 359 350 520 
Southern Company Gas:
Southern Company Gas Capital$163 $279 $206 5.3 %1.8 %0.2 %$440 $547 $485 
Nicor Gas88 349 420 5.1 2.1 0.4 483 830 897 
Southern Company Gas Total$251 $628 $626 5.2 %2.0 %0.4 %
(*)    Average and maximum amounts are based upon daily balances during the 12-month periods ended December 31, 2023, 2022, and 2021.
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Analysis of Cash Flows
Net cash flows provided from (used for) operating, investing, and financing activities in 2023 and 2022 are presented in the following table:
Net cash provided from (used for):Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Operating activities$7,553 $2,079 $2,752 $369 $1,096 $1,762 
Investing activities(9,668)(2,196)(5,079)(370)(265)(1,656)
Financing activities999 (161)1,922 (20)(820)(154)
2022
Operating activities$6,302 $1,639 $2,038 $383 $815 $1,519 
Investing activities(8,430)(2,263)(3,954)(317)(194)(1,580)
Financing activities2,336 251 2,363 (68)(623)96 
Fluctuations in cash flows from financing activities vary from year to year based on capital needs and the maturity or redemption of securities.
Southern Company
Net cash provided from operating activities increased $1.3 billion in 2023 as compared to 2022 primarily due to increased fuel cost recovery and the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to the Subsidiary Registrants' construction programs.
The net cash provided from financing activities in 2023 was primarily related to net issuances of long-term debt and an increase in commercial paper borrowings, partially offset by common stock dividend payments and net repayments of short-term bank loans. The net cash provided from financing activities in 2022 was primarily related to net issuances of long-term debt, the issuance of common stock to settle the purchase contracts entered into as part of the Equity Units (as discussed in Note 8 to the financial statements under "Equity Units"), and an increase in short-term borrowings, partially offset by common stock dividend payments.
Alabama Power
Net cash provided from operating activities increased $440 million in 2023 as compared to 2022 primarily due to an increase in fuel cost recovery and the timing of customer receivable collections, partially offset by the timing of vendor payments and fuel stock purchases.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions, including approximately $79 million and $211 million, respectively, related to the construction of Plant Barry Unit 8 and, for 2022, $171 million related to the acquisition of the Calhoun Generating Station. See Notes 2 and 15 to the financial statements under "Alabama Power" for additional information.
The net cash used for financing activities in 2023 was primarily related to common stock dividend payments, largely offset by net issuances of long-term debt and capital contributions from Southern Company. The net cash provided from financing activities in 2022 was primarily related to net long-term debt issuances and capital contributions from Southern Company, partially offset by common stock dividend payments and preferred stock redemptions.
Georgia Power
Net cash provided from operating activities increased $714 million in 2023 as compared to 2022 primarily due to increased fuel cost recovery, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions, including approximately $1.1 billion and $1.0 billion, respectively, related to the construction of Plant Vogtle Units 3 and 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on construction of Plant Vogtle Units 3 and 4.
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The net cash provided from financing activities in 2023 was primarily related to capital contributions from Southern Company, net issuances of senior notes, an increase in commercial paper borrowings, and reofferings of pollution control revenue bonds which were previously held by Georgia Power, partially offset by common stock dividend payments and a net decrease in short-term borrowings. The net cash provided from financing activities in 2022 was primarily related to a net increase in short-term bank debt, capital contributions from Southern Company, and net issuances of senior notes, partially offset by common stock dividend payments.
Mississippi Power
Net cash provided from operating activities decreased $14 million in 2023 as compared to 2022 primarily due to the timing of vendor payments, partially offset by a decrease in power pool sales and the timing of customer receivable collections.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions.
The net cash used for financing activities in 2023 was primarily related to common stock dividend payments, partially offset by the issuance of senior notes. The net cash used for financing activities in 2022 was primarily related to common stock dividend payments, partially offset by capital contributions from Southern Company and the issuance of revenue bonds.
Southern Power
Net cash provided from operating activities increased $281 million in 2023 as compared to 2022 primarily due to an increase in the utilization of tax credits and the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 was primarily related to the acquisitions of the South Cheyenne and Millers Branch solar facilities and ongoing construction activities. The net cash used for investing activities in 2022 was primarily related to ongoing construction activities. See Note 15 to the financial statements under "Southern Power" for additional information.
The net cash used for financing activities in 2023 was primarily related to the repayment of senior notes at maturity, common stock dividend payments, net distributions to noncontrolling interests, and net repayments of short-term debt. The net cash used for financing activities in 2022 was primarily related to the repayment of senior notes at maturity, common stock dividend payments, and net capital distributions to noncontrolling interests, partially offset by capital contributions from Southern Company.
Southern Company Gas
Net cash provided from operating activities increased $243 million in 2023 as compared to 2022 primarily due to the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to construction of transportation and distribution assets recovered through base rates and infrastructure investment recovered through replacement programs at gas distribution operations, partially offset by proceeds from dispositions. See Note 15 to the financial statements for additional information.
The net cash used for financing activities in 2023 was primarily related to repayment of short-term borrowings and common stock dividend payments, partially offset by net issuances of long-term debt and capital contributions from Southern Company. The net cash provided from financing activities in 2022 was primarily related to net issuances of long-term debt and capital contributions from Southern Company, partially offset by common stock dividend payments and a decrease in short-term borrowings.
Significant Balance Sheet Changes
Southern Company
Significant balance sheet changes in 2023 for Southern Company included:
an increase of $5.3 billion in total property, plant, and equipment primarily related to the Subsidiary Registrants' construction programs;
an increase of $4.7 billion in long-term debt (including securities due within one year) related to new issuances;
a decrease of $1.2 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Southern Company" herein;
an increase of $1.0 billion in total common stockholders' equity primarily related to net income, partially offset by common stock dividend payments;
an increase of $1.0 billion in accumulated deferred income taxes primarily related to an increase in property-related timing differences and the expected utilization of ITCs;
a decrease of $0.6 billion in accounts payable primarily related to the timing of vendor payments;
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a decrease of $0.6 billion in deferred credits related to income taxes primarily due to the flowback of excess deferred income taxes; and
a decrease of $0.5 billion in AROs primarily due to cost estimate updates at Georgia Power for ash pond closures.
See "Financing Activities" herein and Notes 2, 5, 6, 8, and 10 to the financial statements for additional information.
Alabama Power
Significant balance sheet changes in 2023 for Alabama Power included:
an increase of $0.8 billion in total property, plant, and equipment primarily related to the construction of Plant Barry Unit 8 and construction of distribution and transmission facilities;
an increase of $0.6 billion in total common stockholder's equity primarily due to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company;
an increase of $0.6 billion in long-term debt (including securities due within one year) primarily due to the issuance of senior notes and revenue bonds;
a decrease of $0.4 billion in deferred credits related to income taxes primarily due to the flowback of excess deferred income taxes;
a decrease of $0.4 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Alabama Power" herein; and
a decrease of $0.2 billion in other regulatory assets, deferred primarily due to a decrease in deferred under recovered fuel costs.
See "Financing Activities – Alabama Power" herein and Notes 2, 5, and 8 to the financial statements for additional information.
Georgia Power
Significant balance sheet changes in 2023 for Georgia Power included:
an increase of $3.5 billion in total property, plant, and equipment primarily related to the construction of generation, transmission, and distribution facilities, including $1.2 billion for Plant Vogtle Units 3 and 4;
an increase of $2.5 billion in common stockholder's equity primarily due to capital contributions from Southern Company and net income, partially offset by dividends paid to Southern Company;
an increase of $1.8 billion in long-term debt (including securities due within one year) primarily due to net issuances of senior notes;
decreases of $0.4 billion in AROs and $0.3 billion in regulatory assets associated with AROs primarily due to cost estimate updates for ash pond closures;
a decrease of $0.4 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Georgia Power" herein;
an increase of $0.3 billion in accumulated deferred income taxes primarily due to an increase in property-related timing differences; and
a decrease of $0.3 billion in notes payable primarily due to net repayments of short-term bank debt, largely offset by an increase in commercial paper borrowings.
See "Financing Activities – Georgia Power" herein and Notes 2, 5, 6,8, and 10 to the financial statements for additional information.
Mississippi Power
Significant balance sheet changes in 2023 for Mississippi Power included:
an increase of $161 million in total property, plant, and equipment primarily related to the construction of generation, transmission, and distribution facilities;
an increase of $99 million in long-term debt (including securities due within one year) primarily due to issuances of senior notes;
an increase of $72 million in common stockholder's equity related to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company; and
a decrease of $53 million in affiliated receivables primarily due to a decrease in power pool sales.
See "Financing Activities – Mississippi Power" herein and Notes 5 and 8 to the financial statements for additional information.
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Southern Power
Significant balance sheet changes in 2023 for Southern Power included:
an increase of $335 million in accumulated deferred income taxes primarily related to the expected utilization of ITCs;
a decrease of $268 million in long-term debt (including securities due within one year) primarily due to the repayment of senior notes at maturity;
a decrease of $218 million in total stockholder's equity primarily due to dividends paid to Southern Company and net distributions to noncontrolling interests, partially offset by net income and capital contributions from Southern Company; and
a decrease of $189 million in total property, plant, and equipment in service primarily due to continued depreciation of assets, partially offset by an increase in construction work in progress primarily related to the acquisition of the South Cheyenne and Millers Branch solar facilities.
See "Financing Activities – Southern Power" herein and Notes 5, 8, and 15 to the financial statements for additional information.
Southern Company Gas
Significant balance sheet changes in 2023 for Southern Company Gas included:
an increase of $1.1 billion in total property, plant, and equipment primarily related to the construction of transportation and distribution assets and additional infrastructure investment;
a decrease of $0.4 billion in total accounts receivable primarily relating to decreases of $0.2 billion in customer accounts receivable and $0.2 billion in unbilled revenues as a result of seasonality;
an increase of $0.4 billion in common stockholder's equity related to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company;
an increase of $0.4 billion in long-term debt (including securities due within one year) due to issuances of senior notes and first mortgage bonds;
a decrease of $0.4 billion in notes payable due to repayments of short-term debt and commercial paper borrowings;
a decrease of $0.3 billion in other accounts payable due to the timing of vendor payments; and
an increase of $0.2 billion in natural gas cost over recovery primarily due to lower natural gas prices and the timing of natural gas purchases.
See "Financing Activities – Southern Company Gas" herein and Notes 2, 5, and 8 to the financial statements for additional information.
Financing Activities
The following table outlines the Registrants' long-term debt financing activities for the year ended December 31, 2023:
Issuances and ReofferingsMaturities and Redemptions
CompanySenior NotesRevenue
Bonds
Other Long-Term DebtSenior
Notes
Revenue Bonds
Other Long-Term Debt(a)
(in millions)
Southern Company parent$4,525 $— $— $1,850 $— $550 
Alabama Power500 326 29 300 — 
Georgia Power2,450 229 — 800 — 102 
Mississippi Power100 — — — — 
Southern Power— — — 290 — — 
Southern Company Gas500 — 312 350 — 50 
Other— — — — — 
Elimination(b)
— — — — — (9)
Southern Company$8,075 $555 $341 $3,590 $— $704 
(a)Includes reductions in finance lease obligations resulting from cash payments under finance leases and, for Georgia Power, principal amortization payments totaling $86 million for FFB borrowings. See Note 8 to the financial statements under "Long-term Debt – DOE Loan Guarantee Borrowings" for additional information.
(b)Represents reductions in affiliate finance lease obligations at Georgia Power, which are eliminated in Southern Company's consolidated financial statements.
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Except as otherwise described herein, the Registrants used the proceeds of debt issuances for their redemptions and maturities shown in the table above, to repay short-term indebtedness, and for general corporate purposes, including working capital. The Subsidiary Registrants also used the proceeds for their construction programs.
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Registrants plan to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Southern Company
During 2023, Southern Company issued approximately 2.1 million shares of common stock primarily through equity compensation plans and received proceeds of approximately $36 million.
In January 2023, Southern Company redeemed all $550 million aggregate principal amount of its Series 2016B Junior Subordinated Notes due March 15, 2057.
In February 2023, Southern Company issued $1.5 billion aggregate principal amount of its Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes) in a private offering. In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option. See Note 8 to the financial statements under "Convertible Senior Notes" for additional information.
In May 2023, Southern Company repaid at maturity $600 million aggregate principal amount of its 2021C Floating Rate Senior Notes.
Also in May 2023, Southern Company issued $750 million aggregate principal amount of Series 2023B 4.85% Senior Notes due June 15, 2028 and $750 million aggregate principal amount of Series 2023C 5.20% Senior Notes due June 15, 2033.
In July 2023, Southern Company repaid at maturity $1.25 billion aggregate principal amount of its 2.95% Senior Notes.
In September 2023, Southern Company issued $600 million aggregate principal amount of Series 2023D 5.50% Senior Notes due March 15, 2029 and $700 million aggregate principal amount of Series 2023E 5.70% Senior Notes due March 15, 2034.
Alabama Power
During 2023, a subsidiary of Alabama Power borrowed $20 million under a $39 million long-term floating rate bank loan entered into in December 2022 with a maturity date of December 12, 2029.
In May 2023, Alabama Power issued $200 million aggregate principal amount of Series 2023A Floating Rate Senior Notes due May 15, 2073.
In August 2023, the Walker County Economic and Industrial Development Authority issued for the benefit of Alabama Power $228 million aggregate principal amount of Solid Waste Disposal Revenue Bonds (Alabama Power Company Plant Gorgas Project), First Series 2023 ($140 million aggregate principal amount) and Second Series 2023 ($88 million aggregate principal amount) due August 1, 2063. The proceeds from the revenue bonds are being used to finance certain solid waste disposal facilities at Plant Gorgas.
Also in August 2023, the Industrial Development Board of the Town of West Jefferson issued for the benefit of Alabama Power $98 million aggregate principal amount of Solid Waste Disposal Revenue Bonds (Alabama Power Company Plant Miller Project), Series 2023 due August 1, 2063. The proceeds from the revenue bonds are being used to finance certain solid waste disposal facilities at Plant Miller.
In September 2023, a subsidiary of Alabama Power assumed two fixed rate bank loans totaling $9 million, which it repaid in December 2023 using approximately $9 million of borrowings under a new $20 million fixed rate bank loan maturing December 2030.
In November 2023, Alabama Power issued $300 million aggregate principal amount of Series 2023B 5.85% Senior Notes due November 15, 2033.
In December 2023, Alabama Power repaid at maturity $300 million aggregate principal amount of its Series 2013A 3.55% Senior Notes.
Subsequent to December 31, 2023, Alabama Power received a capital contribution of $425 million from Southern Company and also repaid at maturity approximately $21 million aggregate principal amount of Industrial Development Board of the Town of Wilsonville (Alabama) Pollution Control Revenue Bonds (Alabama Power Company Gaston Plant Project), Series D.
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Georgia Power
In March 2023, Georgia Power reoffered to the public the following pollution control revenue bonds that previously had been purchased and were held by Georgia Power at December 31, 2022:
approximately $28 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), Second Series 2006;
approximately $89 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), Second Series 2009;
approximately $49 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), First Series 2012;
approximately $18 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), First Series 2013; and
$46 million aggregate principal amount of Development Authority of Burke County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Vogtle Project), First Series 1996.
Also in March 2023, Georgia Power borrowed $100 million pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand. In April 2023, Georgia Power borrowed an additional $150 million under the arrangement. In May 2023, Georgia Power repaid the aggregate $250 million outstanding.
Also in March 2023, Georgia Power repaid at maturity a $200 million short-term floating rate bank loan entered into in March 2022.
In April 2023, Georgia Power repaid at maturity $100 million aggregate principal amount of its Series N 5.750% Senior Notes.
Also in April 2023, Georgia Power repaid at maturity a $200 million short-term floating rate bank loan entered into in April 2022.
In May 2023, Georgia Power issued $750 million aggregate principal amount of Series 2023A 4.65% Senior Notes due May 16, 2028 and $1.0 billion aggregate principal amount of Series 2023B 4.95% Senior Notes due May 17, 2033.
In July 2023, Georgia Power repaid at maturity $700 million aggregate principal amount of its Series 2020A 2.10% Senior Notes.
In November 2023, Georgia Power issued $700 million aggregate principal amount of Series 2023C Floating Rate Senior Notes due May 8, 2025.
Also in November 2023, Georgia Power repaid $780 million of a $1.2 billion short-term floating rate bank loan entered into in November 2022 and extended the maturity of the remaining outstanding amount of $420 million to November 2024.
In December 2023 and subsequent to December 31, 2023, Georgia Power borrowed $100 million and $150 million, respectively, pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand.
Mississippi Power
In March 2023, Mississippi Power borrowed $50 million of short-term debt pursuant to its $125 million revolving credit arrangement, which it repaid in June 2023.
In June 2023, Mississippi Power issued in a private placement $65 million aggregate principal amount of Series 2023A 5.64% Senior Notes due July 15, 2026 and $35 million aggregate principal amount of Series 2023B 5.63% Senior Notes due July 15, 2033.
Southern Power
In January 2023, Southern Power borrowed $100 million pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand. During the second quarter 2023, Southern Power made net repayments of $50 million of the $100 million borrowed. In October 2023, Southern Power borrowed the remaining $50 million under the arrangement. In December 2023, Southern Power repaid the $100 million outstanding amount.
In September 2023, Southern Power repaid at maturity $290 million aggregate principal amount of its Series 2016C 2.75% Senior Notes.
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Southern Company Gas
In February 2023, Nicor Gas repaid its $150 million and $50 million short-term floating rate bank loans entered into in February 2022 and March 2022, respectively.
In July 2023, Nicor Gas issued in a private placement $50 million aggregate principal amount of 5.28% Series First Mortgage Bonds due July 31, 2030 and $75 million aggregate principal amount of 5.43% Series First Mortgage Bonds due July 31, 2035. In October 2023, pursuant to the same agreement, Nicor Gas issued in a private placement $75 million aggregate principal amount of 5.67% Series First Mortgage Bonds due October 31, 2053 and $75 million aggregate principal amount of 5.77% Series First Mortgage Bonds due October 31, 2063.
In September 2023, Southern Company Gas Capital issued $500 million aggregate principal amount of Series 2023A 5.75% Senior Notes due September 15, 2033, guaranteed by Southern Company Gas.
In October 2023, Southern Company Gas Capital repaid at maturity $350 million aggregate principal amount of its 2.450% Senior Notes.
In December 2023, Nicor Gas repaid at maturity $50 million aggregate principal amount of its 5.80% Series First Mortgage Bonds.
During 2023, Southern Company Gas received cash advances totaling $37 million under a long-term financing agreement related to a construction contract.
Credit Rating Risk
At December 31, 2023, the Registrants did not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change of certain Registrants to BBB and/or Baa2 or below. These contracts are primarily for physical electricity and natural gas purchases and sales, fuel purchases, fuel transportation and storage, energy price risk management, transmission, interest rate management, and, for Georgia Power, services at Plant Vogtle Units 3 and 4.
The maximum potential collateral requirements under these contracts at December 31, 2023 were as follows:
Credit Ratings
Southern Company(*)
Alabama PowerGeorgia PowerMississippi Power
Southern
Power(*)
Southern Company Gas
(in millions)
At BBB and/or Baa2$33 $$— $— $32 $— 
At BBB- and/or Baa3407 60 345 — 
At BB+ and/or Ba1 or below2,074 404 943 319 1,289 19 
(*)Southern Power has PPAs that could require collateral, but not accelerated payment, in the event of a downgrade of Southern Power's credit. The PPAs require credit assurances without stating a specific credit rating. The amount of collateral required would depend upon actual losses resulting from a credit downgrade. Southern Power had $106 million of cash collateral posted related to PPA requirements at December 31, 2023.
The amounts in the previous table for the traditional electric operating companies and Southern Power include certain agreements that could require collateral if either Alabama Power or Georgia Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Registrants to access capital markets and would be likely to impact the cost at which they do so.
Mississippi Power and its largest retail customer, Chevron Products Company (Chevron), have agreements under which Mississippi Power provides retail service to the Chevron refinery in Pascagoula, Mississippi through at least 2038. The agreements grant Chevron a security interest in the co-generation assets owned by Mississippi Power located at the refinery that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the three rating agencies.
On August 2, 2023, S&P revised its credit rating outlook for Southern Company and its subsidiaries to positive from stable.
On September 1, 2023, Fitch upgraded the senior unsecured long-term debt rating of Georgia Power to A- from BBB+ and revised the rating outlook to positive from stable.
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Also on September 1, 2023, Fitch revised the ratings outlook of Southern Company, Alabama Power, Southern Power, Nicor Gas, and SEGCO to stable from negative.
On September 26, 2023, Moody's upgraded Mississippi Power's senior unsecured long-term debt rating to A3 from Baa1 and revised its rating outlook to stable from positive.
Also on September 26, 2023, Moody's revised its ratings outlooks for Southern Company and Georgia Power to positive from stable.
Market Price Risk
The Registrants had no material change in market risk exposure for the year ended December 31, 2023 when compared to the year ended December 31, 2022. See Note 14 to the financial statements for an in-depth discussion of the Registrants' derivatives, as well as Note 1 to the financial statements under "Financial Instruments" for additional information.
Due to cost-based rate regulation and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities that sell natural gas directly to end-use customers continue to have limited exposure to market volatility in interest rates, foreign currency exchange rates, commodity fuel prices, and prices of electricity. The traditional electric operating companies and certain of the natural gas distribution utilities manage fuel-hedging programs implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies to hedge the impact of market fluctuations in natural gas prices for customers. Mississippi Power also manages wholesale fuel-hedging programs under agreements with its wholesale customers. Because energy from Southern Power's facilities is primarily sold under long-term PPAs with tolling agreements and provisions shifting substantially all of the responsibility for fuel cost to the counterparties, Southern Power's exposure to market volatility in commodity fuel prices and prices of electricity is generally limited. However, Southern Power has been and may continue to be exposed to market volatility in energy-related commodity prices as a result of uncontracted generating capacity. To mitigate residual risks relative to movements in electricity prices, the traditional electric operating companies and Southern Power may enter into physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market and, to a lesser extent, financial hedge contracts for natural gas purchases; however, a significant portion of contracts are priced at market.
Certain of Southern Company Gas' non-regulated operations routinely utilize various types of derivative instruments to economically hedge certain commodity price and weather risks inherent in the natural gas industry. These instruments include a variety of exchange-traded and OTC energy contracts, such as forward contracts, futures contracts, options contracts, and swap agreements. Southern Company Gas' gas marketing services business also actively manages storage positions through a variety of hedging transactions for the purpose of managing exposures arising from changing natural gas prices. These hedging instruments are used to substantially protect economic margins (as spreads between wholesale and retail natural gas prices widen between periods) and thereby minimize exposure to declining earnings. Some of these economic hedge activities may not qualify, or may not be designated, for hedge accounting treatment.
The following table provides information related to variable interest rate exposure on long-term debt (including amounts due within one year) at December 31, 2023 for the applicable Registrants:
At December 31, 2023
Southern Company(*)
Alabama
Power
Georgia
Power
Mississippi
Power
Southern Company
Gas
(in millions, except percentages)
Long-term variable interest rate exposure$5,290 $1,083 $1,939 $269 $500 
Weighted average interest rate on long-term variable interest rate exposure5.87 %4.75 %5.48 %5.39 %5.85 %
Impact on annualized interest expense of 100 basis point change in interest rates$53 $11 $19 $$
(*)Includes $1.4 billion of long-term variable interest rate exposure at the Southern Company parent entity.
The Registrants may enter into interest rate derivatives designated as hedges, which are intended to mitigate interest rate volatility related to forecasted debt financings and existing fixed and floating rate obligations. See Note 14 to the financial statements under "Interest Rate Derivatives" for additional information.
Southern Company and Southern Power had foreign currency denominated debt at December 31, 2023 and have each mitigated exposure to foreign currency exchange rate risk through the use of foreign currency swaps. See Note 14 to the financial statements under "Foreign Currency Derivatives" for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Changes in fair value of energy-related derivative contracts for Southern Company and Southern Company Gas for the years ended December 31, 2023 and 2022 are provided in the table below. At December 31, 2023 and 2022, substantially all of the traditional electric operating companies' and certain of the natural gas distribution utilities' energy-related derivative contracts were designated as regulatory hedges and were related to the applicable company's fuel-hedging program.
Southern Company(a)
Southern Company Gas(a)
(in millions)
Contracts outstanding at December 31, 2021, assets (liabilities), net$174 $8 
Contracts realized or settled(327)10 
Current period changes(b)
142 (55)
Contracts outstanding at December 31, 2022, assets (liabilities), net$(11)$(37)
Contracts realized or settled207 33 
Current period changes(b)
(500)(45)
Contracts outstanding at December 31, 2023, assets (liabilities), net$(304)$(49)
(a)Excludes cash collateral held on deposit in broker margin accounts of $62 million, $41 million, and $3 million at December 31, 2023, 2022, and 2021, respectively, and immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
(b)The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
The net hedge volumes of energy-related derivative contracts for natural gas purchased (sold) at December 31, 2023 and 2022 for Southern Company and Southern Company Gas were as follows:
Southern CompanySouthern Company Gas
mmBtu Volume (in millions)
At December 31, 2023:
Commodity – Natural gas swaps109 — 
Commodity – Natural gas options339 102 
Total hedge volume448 102 
At December 31, 2022:
Commodity – Natural gas swaps217 — 
Commodity – Natural gas options214 93 
Total hedge volume431 93 
Southern Company Gas' derivative contracts are comprised of both long and short natural gas positions. A long position is a contract to purchase natural gas, and a short position is a contract to sell natural gas. The volumes presented above for Southern Company Gas represent the net of long natural gas positions of 112 million mmBtu and short natural gas positions of 10 millionmmBtu at December 31, 2023 and the net of long natural gas positions of 98 million mmBtu and short natural gas positions of 5 million mmBtu at December 31, 2022.
For the Southern Company system, the weighted average swap contract cost per mmBtu was approximately $0.76 per mmBtu below market prices at December 31, 2023 and was approximately $0.08 per mmBtu above market prices at December 31, 2022. The change in option fair value is primarily attributable to the volatility of the market and the underlying change in the natural gas price. Substantially all of the traditional electric operating companies' natural gas hedge gains and losses are recovered through their respective fuel cost recovery clauses.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
The Registrants use over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. In addition, Southern Company Gas uses exchange-traded market-observable contracts, which are categorized as Level 1. See Note 13 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts for Southern Company and Southern Company Gas at December 31, 2023 were as follows:
Fair Value Measurements of Contracts at
December 31, 2023
Total
Fair Value
Maturity
20242025 – 20262027 – 2028Thereafter
(in millions)
Southern Company
Level 1(a)
$(40)$(36)$(4)$— $— 
Level 2(b)
(264)(180)(87)
Southern Company total(c)
$(304)$(216)$(91)$$
Southern Company Gas
Level 1(a)
$(40)$(36)$(4)$— $— 
Level 2(b)
(9)(8)(1)— — 
Southern Company Gas total(c)
$(49)$(44)$(5)$— $— 
(a)Valued using NYMEX futures prices.
(b)Level 2 amounts for Southern Company Gas are valued using basis transactions that represent the cost to transport natural gas from a NYMEX delivery point to the contract delivery point. These transactions are based on quotes obtained either through electronic trading platforms or directly from brokers.
(c)Excludes cash collateral of $62 million as well as immaterial premium and associated intrinsic value associated with weather derivatives.
The Registrants are exposed to risk in the event of nonperformance by counterparties to energy-related and interest rate derivative contracts, as applicable. The Registrants only enter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P, or with counterparties who have posted collateral to cover potential credit exposure. Therefore, the Registrants do not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 14 to the financial statements.
Credit Risk
Southern Company (except as discussed herein), the traditional electric operating companies, and Southern Power are not exposed to any concentrations of credit risk. Southern Company Gas' exposure to concentrations of credit risk is discussed herein.
Southern Company Gas
Gas Distribution Operations
Concentration of credit risk occurs at Atlanta Gas Light for amounts billed for services and other costs to its customers, which consist of the 13 Marketers in Georgia. The credit risk exposure to the Marketers varies seasonally, with the lowest exposure in the non-peak summer months and the highest exposure in the peak winter months. Marketers are responsible for the retail sale of natural gas to end-use customers in Georgia. The provisions of Atlanta Gas Light's tariff allow Atlanta Gas Light to obtain credit security support in an amount equal to a minimum of two times a Marketer's highest month's estimated bill from Atlanta Gas Light. For 2023, the four largest Marketers based on customer count, which includes SouthStar, accounted for 18% of Southern Company Gas' operating revenues and 20% of operating revenues for Southern Company Gas' gas distribution operations segment.
Several factors are designed to mitigate Southern Company Gas' risks from the increased concentration of credit that has resulted from deregulation. In addition to the security support described above, Atlanta Gas Light bills intrastate delivery service to Marketers in advance rather than in arrears. Atlanta Gas Light accepts credit support in the form of cash deposits, letters of credit/surety bonds from acceptable issuers, and corporate guarantees from investment-grade entities. Southern Company Gas reviews the adequacy of credit support coverage, credit rating profiles of credit support providers, and payment status of each Marketer. Southern Company Gas believes that adequate policies and procedures are in place to properly quantify, manage, and report on Atlanta Gas Light's credit risk exposure to Marketers.
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Atlanta Gas Light also faces potential credit risk in connection with assignments of interstate pipeline transportation and storage capacity to Marketers. Although Atlanta Gas Light assigns this capacity to Marketers, in the event that a Marketer fails to pay the interstate pipelines for the capacity, the interstate pipelines would likely seek repayment from Atlanta Gas Light.
Gas Marketing Services
Southern Company Gas obtains credit scores for its firm residential and small commercial customers using a national credit reporting agency, enrolling only those customers that meet or exceed Southern Company Gas' credit threshold. Southern Company Gas considers potential interruptible and large commercial customers based on reviews of publicly available financial statements and commercially available credit reports. Prior to entering into a physical transaction, Southern Company Gas also assigns physical wholesale counterparties an internal credit rating and credit limit based on the counterparties' Moody's, S&P, and Fitch ratings, commercially available credit reports, and audited financial statements.
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Item 8.FINANCIAL STATEMENTS
AND SUPPLEMENTARY DATA
Page
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Page

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Item 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
None.
Item 9A.CONTROLS AND PROCEDURES
Disclosure Controls and Procedures.
As of the end of the period covered by this Annual Report on Form 10-K, Southern Company, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power, and Southern Company Gas conducted separate evaluations under the supervision and with the participation of each company's management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of the disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended). Based upon these evaluations, the Chief Executive Officer and the Chief Financial Officer, in each case, concluded that the disclosure controls and procedures are effective.
Internal Control Over Financial Reporting.
(a) Management's Annual Report on Internal Control Over Financial Reporting.
Management's Report on Internal Control Over Financial ReportingPage
(b) Attestation Report of the Registered Public Accounting Firm.
The report of Deloitte & Touche LLP, Southern Company's independent registered public accounting firm, regarding Southern Company's Internal Control over Financial Reporting is included on page II-9 of this Form 10-K. This report is not applicable to Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power, and Southern Company Gas as these companies are not accelerated filers or large accelerated filers.
(c) Changes in internal control over financial reporting.
There have been no changes in Southern Company's, Alabama Power's, Georgia Power's, Gulf Power's, Mississippi Power's, Southern Power's, or Southern Company Gas' internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended) during the fourth quarter 2017 that have materially affected or are reasonably likely to materially affect Southern Company's, Alabama Power's, Georgia Power's, Gulf Power's, Mississippi Power's, Southern Power's, or Southern Company Gas' internal control over financial reporting.
Item 9B.OTHER INFORMATION
None.
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THE SOUTHERN COMPANY
AND SUBSIDIARY COMPANIES
FINANCIAL SECTION

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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Southern Company and Subsidiary Companies 2017 Annual Report
The management of The Southern Company (Southern Company) is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of Southern Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Southern Company's internal control over financial reporting was effective as of December 31, 2017.
Deloitte & Touche LLP, as auditors of Southern Company's financial statements, has issued an attestation report on the effectiveness of Southern Company's internal control over financial reporting as of December 31, 2017, which is included herein.

/s/ Thomas A. Fanning
Thomas A. Fanning
Chairman, President, and Chief Executive Officer

/s/ Art P. Beattie
Art P. Beattie
Executive Vice President and Chief Financial Officer
February 20, 2018

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMOther Electric Revenues
To the stockholders and the BoardOther electric revenues increased $45 million, or 6.0%, in 2023 as compared to 2022. The increase was primarily due to increases of Directors$23 million in outdoor lighting sales at Georgia Power, $18 million resulting from receipts of The Southern Company and Subsidiary Companies
Opinions on the Financial Statements and Internal Control over Financial Reporting
We have audited the accompanying consolidated balance sheets and consolidated statements of capitalization of The Southern Company and Subsidiary Companies (the Company) as of December 31, 2017 and 2016, the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2017, and the related notes (collectively referred to as the "financial statements"). We also have audited the Company's internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).
In our opinion, the financial statements (pages II-64 to II-151) referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformityliquidated damages associated with accounting principles generally accepted in the United States of America. Also, in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on criteria established in Internal Control – Integrated Framework (2013) issued by COSO.
Basis for Opinions
The Company's management is responsible for these financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control Over Financial Reporting (page II-8). Our responsibility is to express an opinion on these financial statementsgeneration facility production guarantees and an opinionarbitration award at Southern Power, $17 million in realized gains associated with price stability products for retail customers on the Company's internal control over financial reporting based on our audits. We are a public accounting firm registeredvariable demand-driven pricing tariffs at Georgia Power, and $17 million in retail solar program fees at Georgia Power, partially offset by decreases of $25 million in cogeneration steam revenues associated with the Public Company Accounting Oversight Board (United States) (PCAOB)lower natural gas prices at Alabama Power and are required to be independent with respect to the Company$14 million in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.rent revenues primarily at Alabama Power.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.
Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures to respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.
Definition and Limitations of Internal Control over Financial Reporting
A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018
We have served as the Company's auditor since 2002.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS

Energy Sales
DEFINITIONSChanges in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential47.1 (5.1)%(0.5)%
Commercial48.3 0.1 1.3 
Industrial48.6 (1.9)(1.9)
Other0.5 (7.2)(6.8)
Total retail144.5 (2.3)(0.4)%
Wholesale51.0 (9.4)
Total energy sales195.5 (4.3)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in the applicable service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Weather-adjusted retail energy sales decreased 587 million KWHs in 2023 as compared to 2022. Weather-adjusted residential KWH sales decreased 0.5% primarily due to decreased customer usage, partially offset by customer growth. Weather-adjusted commercial KWH sales increased 1.3% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 1.9% primarily due to decreases in the chemicals, forest products, and textiles sectors.
See "Electric Operating Revenues" above for a discussion of significant changes in wholesale revenues related to changes in price and KWH sales.
Other Revenues
Other revenues increased $108 million, or 37.5%, in 2023 as compared to 2022. The increase was primarily due to increases of $54 million in power delivery construction and maintenance projects at Georgia Power, $34 million in unregulated sales of products and services at Alabama Power, and $25 million associated with energy conservation projects at Georgia Power.
Fuel and Purchased Power Expenses
The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, the electric utilities purchase a portion of their electricity needs from the wholesale market.
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TermMeaning
2012 MPSC CPCN OrderA detailed order issued by the Mississippi PSC in April 2012 confirming the CPCN originally approved by the Mississippi PSC in 2010 authorizing acquisition, construction, and operation of Mississippi Power's Kemper County energy facility
2013 ARPAlternative Rate Plan approved by the Georgia PSC in 2013 for Georgia Power for the years 2014 through 2016 and subsequently extended through 2019
AFUDCAllowance for funds used during construction
Alabama PowerAlabama Power Company
AROAsset retirement obligation
ASCAccounting Standards Codification
ASUAccounting Standards Update
Atlanta Gas LightAtlanta Gas Light Company, a wholly-owned subsidiary of Southern Company Gas
Atlantic Coast PipelineAtlantic Coast Pipeline, LLC, a joint venture to construct and operate a natural gas pipeline in which Southern Company Gas has a 5% ownership interest
Bechtel                                                                Bechtel Power Corporation
CCRCoal combustion residuals
Clean Air ActClean Air Act Amendments of 1990
CO2
Carbon dioxide
CODCommercial operation date
Contractor Settlement AgreementThe December 31, 2015 agreement between Westinghouse and the Vogtle Owners resolving disputes between the Vogtle Owners and the EPC Contractor under the Vogtle 3 and 4 Agreement
Cooperative EnergyElectric cooperative in Mississippi
CPCNCertificate of public convenience and necessity
CWIPConstruction work in progress
Dalton PipelineA pipeline facility in Georgia in which Southern Company Gas has a 50% undivided ownership interest
DOEU.S. Department of Energy
Eligible Project CostsCertain costs of construction relating to Plant Vogtle Units 3 and 4 that are eligible for financing under the loan guarantee program established under Title XVII of the Energy Policy Act of 2005
EPAU.S. Environmental Protection Agency
EPC ContractorWestinghouse and its affiliate, WECTEC Global Project Services Inc.; the former engineering, procurement, and construction contractor for Plant Vogtle Units 3 and 4
FASBFinancial Accounting Standards Board
FERCFederal Energy Regulatory Commission
FFBFederal Financing Bank
GAAPU.S. generally accepted accounting principles
Georgia PowerGeorgia Power Company
Gulf PowerGulf Power Company
IGCCIntegrated coal gasification combined cycle, the technology originally approved for Mississippi Power's Kemper County energy facility (Plant Ratcliffe)
Interim Assessment AgreementAgreement entered into by the Vogtle Owners and the EPC Contractor to allow construction to continue after the EPC Contractor's bankruptcy filing
IRSInternal Revenue Service
ITCInvestment tax credit
KWHKilowatt-hour
LIBORLondon Interbank Offered Rate

Table of ContentsIndex to Financial Statements


DEFINITIONS
(continued)
TermMeaning
LIFOLast-in, first-out
Loan Guarantee AgreementLoan guarantee agreement entered into by Georgia Power with the DOE in 2014, under which the proceeds of borrowings may be used to reimburse Georgia Power for Eligible Project Costs incurred in connection with its construction of Plant Vogtle Units 3 and 4
LTSALong-term service agreement
MergerThe merger, effective July 1, 2016, of a wholly-owned, direct subsidiary of Southern Company with and into Southern Company Gas, with Southern Company Gas continuing as the surviving corporation
Mirror CWIPA regulatory liability used by Mississippi Power to record financing costs associated with construction of the Kemper County energy facility, which were subsequently refunded to customers
Mississippi PowerMississippi Power Company
mmBtuMillion British thermal units
Moody'sMoody's Investors Service, Inc.
MPUSMississippi Public Utilities Staff
MWMegawatt
natural gas distribution utilitiesSouthern Company Gas' seven natural gas distribution utilities (Nicor Gas, Atlanta Gas Light, Virginia Natural Gas, Inc., Elizabethtown Gas, Florida City Gas, Chattanooga Gas Company, and Elkton Gas)
NCCRGeorgia Power's Nuclear Construction Cost Recovery
NDRAlabama Power's Natural Disaster Reserve
New Jersey BPUNew Jersey Board of Public Utilities, the state regulatory agency for Elizabethtown Gas
Nicor GasNorthern Illinois Gas Company, a wholly-owned subsidiary of Southern Company Gas
NOX
Nitrogen oxide
NRCU.S. Nuclear Regulatory Commission
OCIOther comprehensive income
PennEast PipelinePennEast Pipeline Company, LLC, a joint venture to construct and operate a natural gas pipeline in which Southern Company Gas has a 20% ownership interest
PowerSecurePowerSecure, Inc.
power poolThe operating arrangement whereby the integrated generating resources of the traditional electric operating companies and Southern Power (excluding subsidiaries) are subject to joint commitment and dispatch in order to serve their combined load obligations
PPAPower purchase agreements, as well as, for Southern Power, contracts for differences that provide the owner of a renewable facility a certain fixed price for the electricity sold to the grid
PSCPublic Service Commission
PTCProduction tax credit
Rate CNPAlabama Power's Rate Certificated New Plant
Rate CNP ComplianceAlabama Power's Rate Certificated New Plant Compliance
Rate CNP PPAAlabama Power's Rate Certificated New Plant Power Purchase Agreement
Rate ECRAlabama Power's Rate Energy Cost Recovery
Rate NDRAlabama Power's Rate Natural Disaster Reserve
Rate RSEAlabama Power's Rate Stabilization and Equalization plan
ROEReturn on equity
S&PS&P Global Ratings, a division of S&P Global Inc.
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECU.S. Securities and Exchange Commission
SEGCOSouthern Electric Generating Company

DEFINITIONS
(continued)
TermMeaning
SO2
Sulfur dioxide
Southern Company GasSouthern Company Gas and its subsidiaries
Southern Company Gas CapitalSouthern Company Gas Capital Corporation, a 100%-owned subsidiary of Southern Company Gas
Southern Company systemThe Southern Company, the traditional electric operating companies, Southern Power, Southern Company Gas (as of July 1, 2016), SEGCO, Southern Nuclear, SCS, Southern Linc, PowerSecure (as of May 9, 2016), and other subsidiaries
Southern LincSouthern Communications Services, Inc.
Southern NuclearSouthern Nuclear Operating Company, Inc.
Southern PowerSouthern Power Company and its subsidiaries
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
ToshibaToshiba Corporation, parent company of Westinghouse
Toshiba GuaranteeCertain payment obligations of the EPC Contractor guaranteed by Toshiba
traditional electric operating companiesAlabama Power, Georgia Power, Gulf Power, and Mississippi Power
VCMVogtle Construction Monitoring
Vogtle 3 and 4 AgreementAgreement entered into with the EPC Contractor in 2008 by Georgia Power, acting for itself and as agent for the Vogtle Owners, pursuant to which the EPC Contractor agreed to design, engineer, procure, construct, and test Plant Vogtle Units 3 and 4
Vogtle OwnersGeorgia Power, Oglethorpe Power Corporation, the Municipal Electric Authority of Georgia, and the City of Dalton, Georgia, an incorporated municipality in the State of Georgia acting by and through its Board of Water, Light, and Sinking Fund Commissioners
Vogtle Services AgreementThe June 9, 2017 services agreement between the Vogtle Owners and the EPC Contractor, as amended and restated on July 20, 2017, for the EPC Contractor to transition construction management of Plant Vogtle Units 3 and 4 to Southern Nuclear and to provide ongoing design, engineering, and procurement services to Southern Nuclear
WestinghouseWestinghouse Electric Company LLC

COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Details of the Southern Company system's generation and Subsidiary Companies 2017 Annual Reportpurchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)(b)
184 186 
Total purchased power (in billions of KWHs)
18 25 
Sources of generation (percent)(a) —
Gas54 51 
Nuclear(b)
18 16 
Coal17 22 
Hydro3 
Wind, Solar, and Other8 
Cost of fuel, generated (in cents per net KWH) 
Gas(a)
2.77 5.29 
Nuclear(b)
0.76 0.72 
Coal4.33 3.67 
Average cost of fuel, generated (in cents per net KWH)(a)(b)
2.68 4.05 
Average cost of purchased power (in cents per net KWH)(c)
5.17 7.66 
OVERVIEW(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
Business Activities(b)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
The(c)Average cost of purchased power includes fuel purchased by the Southern Company (Southern Companysystem for tolling agreements where power is generated by the provider.
In 2023, total fuel and purchased power expenses were $5.2 billion, a decrease of $3.2 billion, or 37.7%, as compared to 2022. The decrease was primarily the Company) isresult of a holding company that owns all$2.7 billion decrease in the average cost of fuel generated and purchased and a $513 million net decrease in the common stockvolume of KWHs generated and purchased.
Fuel and purchased power energy transactions at the traditional electric operating companies are generally offset by fuel revenues and do not have a significant impact on net income. See Note 2 to the parent entitiesfinancial statements for additional information. Fuel expenses incurred under Southern Power's PPAs are generally the responsibility of Southernthe counterparties and do not significantly impact net income.
Fuel
In 2023, fuel expense was $4.4 billion, a decrease of $2.5 billion, or 36.1%, as compared to 2022. The decrease was primarily due to a 47.6% decrease in the average cost of natural gas per KWH generated and a 22.5% decrease in the volume of KWHs generated by coal, partially offset by an 18.2% decrease in the volume of KWHs generated by hydro, an 18.0% increase in the average cost of coal per KWH generated, a 10.8% increase in the volume of KWHs generated by nuclear, and a 6.9% increase in the volume of KWHs generated by natural gas.
Purchased Power
In 2023, purchased power expense was $883 million, a decrease of $710 million, or 44.6%, as compared to 2022. The decrease was primarily due to a 32.5% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 27.5% decrease in the volume of KWHs purchased.
Energy purchases will vary depending on demand for energy within the Southern Company Gas and owns other direct and indirect subsidiaries. The primary businessessystem's electric service territory, the market prices of wholesale energy as compared to the cost of the Southern Company system are electricitysystem's generation, and the availability of the Southern Company system's generation.
Cost of Other Sales
Cost of other sales by the traditional electric operating companiesincreased $57 million, or 50.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $40 million from unregulated power delivery construction and Southernmaintenance projects at Georgia Power and $20 million in expenses related to unregulated products and services at Alabama Power.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $550 million, or 10.5%, in 2023 as compared to 2022. The decrease reflects a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred at Alabama Power. Excluding this decrease, there were decreases of $223 million in transmission and distribution expenses primarily related to line maintenance, $182 million in storm damage recovery as authorized in Georgia Power's 2022 ARP, $91 million in generation non-outage maintenance expenses and planned outages, and $50 million in employee compensation and benefit expenses, partially offset by an $86 million increase in technology infrastructure and application production costs and a $73 million increase in generation environmental projects primarily at Georgia Power. See Note 1 to the financial statements under "Storm Damage and Reliability Reserves" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $836 million, or 27.6%, in 2023 as compared to 2022. The increase was primarily due to increases of natural gas by Southern Company Gas.$541 million and $190 million resulting from higher depreciation rates at Alabama Power and Georgia Power, respectively, and $79 million from additional plant in service. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $34 million, or 3.0%, in 2023 as compared to 2022. The four traditional electric operating companies are vertically integrated utilities providing electric serviceincrease was primarily due to increases of $62 million in four Southeastern states. Southernproperty taxes primarily at Georgia Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based ratesresulting from an increase in the wholesale market. assessed value of property and $14 million in utility license taxes at Alabama Power, partially offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues at Georgia Power.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect Georgia Power's revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $37 million, or 17.6%, in 2023 as compared to 2022. The increase was primarily associated with an increase in capital expenditures subject to AFUDC at Georgia Power and an increase in capital expenditures related to hydro production and Plant Barry Unit 8 construction at Alabama Power. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $207 million, or 19.4%, in 2023 as compared to 2022. The increase reflects approximately $120 million related to higher interest rates and $96 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $17 million, or 3.3%, in 2023 as compared to 2022 primarily due to a $48 million decrease in charitable donations primarily at Georgia Power, a $15 million increase in interest income, and a $14 million decrease in non-operating benefit-related expenses at Alabama Power, partially offset by a $42 million decrease in non-service cost-related retirement benefits income and a $13 million decrease in customer charges related to contributions in aid of construction at Georgia Power. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $265 million, or 31.3%, in 2023 as compared to 2022. The decrease was primarily due to a $252 million increase in the flowback of certain excess deferred income taxes at Alabama Power, an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards at Georgia Power, generation of $35 million of advanced nuclear PTCs at Georgia Power, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward at Georgia Power, partially offset by a $145 million decrease in the flowback of certain excess deferred income taxes at Georgia Power that ended in 2022. See Note 10 to the financial statements for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Net Loss Attributable to Noncontrolling Interests
Substantially all noncontrolling interests relate to renewable projects at Southern Power. Net loss attributable to noncontrolling interests increased $20 million, or 18.7%, in 2023 as compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to Southern Power's wind tax equity partners and $5 million in lower income allocations to Southern Power's equity partners, partially offset by $10 million in lower HLBV loss allocations to Southern Power's battery energy storage partners.
Gas Business
Southern Company Gas distributes natural gas through natural gas distribution utilities in sevenfour states and is involved in several other complementary businesses including gas marketing services, wholesale gas services,pipeline investments and gas midstream operations. See FUTURE EARNINGS POTENTIAL – "General" hereinmarketing services.
A condensed statement of income for information regarding agreements entered into by a wholly-owned subsidiary ofthe gas business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Income taxes211 31 
Net income$615 $43 
During the period from November through March when natural gas usage and operating revenues are generally higher (Heating Season), more customers are connected to Southern Company Gas to sell two of its natural gasGas' distribution utilities.
Many factors affect the opportunities, challenges, and risks of the Southern Company system's electricitysystems and natural gas businesses. These factors includeusage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively equally over any given year. Thus, operating results can vary significantly from quarter to quarter as a result of seasonality. For 2023, the abilitypercentage of operating revenues and net income generated during
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
the Heating Season (January through March and November through December) were 67% and 73%, respectively. For 2022, the percentage of operating revenues and net income generated during the Heating Season were 67% and 66%, respectively.
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to maintain2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and grow sales and customers, andbase rate changes increased in 2023 primarily due to effectively manage and secure timely recovery of costs. These costs include those related to projected long-term demand growth, stringent environmental standards, reliability, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants, expanding the electric transmission and distribution systems, and updating and expandingrate increases at the natural gas distribution systems.utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The traditional electric operating companies and natural gas distribution utilities have various regulatoryweather or revenue normalization mechanisms that operatemitigate revenue fluctuations from customer consumption changes. Natural gas distribution rates include provisions to addressadjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost recovery. Effectively operating pursuantof natural gas and do not affect net income from the natural gas distribution utilities. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to these regulatory mechanismslower natural gas prices and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the timing of unrealized hedge losses.
Southern Company systemGas hedged its exposure to warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. The remaining impacts of weather on earnings were immaterial.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, the foreseeable future. natural gas distribution utilities rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See Note 32 to the financial statements under "Regulatory Matters""Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at the natural gas distribution utilities represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, in 2023 compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses increased $18 million, or 1.5%, in 2023 compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Another major factor affecting
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Depreciation and Amortization
Depreciation and amortization increased $23 million, or 4.1%, in 2023 compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes decreased $20 million, or 7.1%, in 2023 compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company system's businesses is the profitabilityGas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of the competitive market-based wholesale generating business. Southern Power's strategy isan agreement to create value through various transactions including acquisitions and sales of assets, development and construction of new generating facilities, and entry into PPAs primarily with investor-owned utilities, independent power producers, municipalities, electric cooperatives, and other load-serving entities, as well as commercial and industrial customers. In general, Southern Power has committedsell two natural gas storage facilities. See Note 15 to the constructionfinancial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $47 million, or acquisition17.9%, in 2023 compared to 2022. The increase reflects approximately $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
Income taxes increased $31 million, or 17.2%, in 2023 compared to 2022. The increase was primarily due to $33 million of new generating capacity only after entering into or assuming long-term PPAs fortax benefit in 2022 related to the new facilities. Southern Power is also currently pursuingimpairment charges associated with the sale of a portion of equity interests in its solar assets.two natural gas storage facilities and higher taxes related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See FUTURE EARNINGS POTENTIAL – "General" hereinNotes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Other Business Activities
Southern Company's other business activities primarily include providingthe parent company (which does not allocate operating expenses to business units); PowerSecure, which provides distributed energy technologies and services to electric utilities and large industrial, commercial, institutional, and municipal customers. Customer solutions include distributed generation systems, utility infrastructureresilience solutions and energy efficiency productsdeploys microgrids for commercial, industrial, governmental, and services. Other business activities also include investmentsutility customers; Southern Holdings, which invests in telecommunications, leveraged lease projects,various projects; and gas storage facilities. Management continues to evaluate the contribution of each of these activities to total shareholder return and may pursue acquisitions, dispositions, and other strategic ventures or investments accordingly.
In striving to achieve attractive risk-adjusted returns while providing cost-effective energy to more than nine million electric and gas utility customers,Southern Linc, which provides digital wireless communications for use by the Southern Company system continues to focus on several key performance indicators. These indicators include, but are not limited to, customer satisfaction, plant availability, electric and natural gas system reliability, execution of major construction projects, and earnings per share (EPS). Southern Company's financial success is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. Management uses customer satisfaction surveys and reliability indicators to evaluate the results of the Southern Company system.
See RESULTS OF OPERATIONS herein for information on the Company's financial performance.
Kemper County Energy Facility Status
The Kemper County energy facility was approved by the Mississippi PSC as an IGCC facility in the 2010 CPCN proceedings, subject to a construction cost cap of $2.88 billion, net of $245 million of grants awardedalso markets these services to the project bypublic and provides fiber optics services within the DOE under the Clean Coal Power Initiative Round 2 (Initial DOE Grants) and excluding the cost of the lignite mine and equipment, the cost ofSoutheast.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


A condensed statement of operations for Southern Company's other business activities follows:
the CO2 pipeline facilities, AFUDC, and certain general exceptions (Cost Cap Exceptions). The combined cycle and associated common facilities portions
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$554 $110 
Cost of other sales355 87 
Other operations and maintenance175 (26)
Depreciation and amortization77 
Taxes other than income taxes4 — 
Impairment charges (119)
Gain on dispositions, net 14 
Total operating expenses611 (42)
Operating income (loss)(57)152 
Earnings from equity method investments5 
Interest expense863 171 
Other income (expense), net(16)39 
Income taxes (benefit)(298)(65)
Net loss$(633)$87 
Operating Revenues
Operating revenues for these other business activities increased $110 million, or 24.8%, in 2023 as compared to 2022 primarily due to increases of the Kemper County energy facility were placed in service in August 2014. In December 2015, the Mississippi PSC issued an order (In-Service Asset Rate Order), authorizing rates that provided for the recovery of approximately $126$92 million annually related to the assets previously placed in service.
On June 21, 2017, the Mississippi PSC stated its intentdistributed infrastructure projects at PowerSecure and $24 million primarily related to issue an order (which occurred on July 6, 2017) directing Mississippi Power to pursue a settlement under which the Kemper County energy facility would be operated as a natural gas plant, rather than an IGCC plant, and address all issuessales associated with the Kemper County energy facility (Kemper Settlement Order). The Kemper Settlement Order established a new docketcommercial customers at Southern Linc.
Cost of Other Sales
Cost of other sales for the purposesthese other business activities increased $87 million, or 32.5%, in 2023 as compared to 2022 primarily due to increases of pursuing a global settlement of the$58 million related costs (Kemper Settlement Docket).to distributed infrastructure projects at PowerSecure and $23 million primarily related to sales associated with commercial customers at Southern Linc.
On June 28, 2017, Mississippi Power notified the Mississippi PSC that it would begin a process to suspendOther Operations and Maintenance
Other operations and start-upmaintenance expenses for these other business activities ondecreased $26 million, or 12.9%, in 2023 as compared to 2022 primarily due to a decrease at the gasifier portion of the Kemper County energy facility, given the uncertainty as to its future. At the time of project suspension, the total cost estimate for the Kemper County energy facility was approximately $7.38 billion, including approximately $5.95 billion of costs subject to the construction cost cap, and was net of the $137 million in additional grants from the DOE received on April 8, 2016 (Additional DOE Grants). In the aggregate, Mississippi Power had incurred charges of $3.07 billion ($1.89 billion after tax) as a result of changes in the cost estimate above the cost cap for the Kemper IGCC through May 31, 2017. Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, Mississippi Power recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine.
On February 6, 2018, the Mississippi PSC voted to approve a settlement agreementparent company related to cost recovery for the Kemper County energy facility among Mississippi Power, the MPUS,containment efforts and certain intervenors (Kemper Settlement Agreement). The Kemper Settlement Agreement provides for an annual revenue requirementlower director compensation expenses.
Impairment Charges
In 2022, a goodwill impairment charge of approximately $99.3$119 million for costs related to the Kemper County energy facility, which includes the impact of Tax Reform Legislation. The revenue requirement is based on (i) a fixed ROE for 2018 of 8.6%, excluding any performance adjustment, (ii) a ROE for 2019 calculated in accordance with Mississippi Power's Performance Evaluation Plan (PEP), excluding the performance adjustment, (iii) for future years, a performance-based ROE calculated pursuant to PEP, and (iv) amortization periods for the related regulatory assets and liabilities of eight years and six years, respectively. The revenue requirement also reflects a disallowance related to a portion of Mississippi Power's investment in the Kemper County energy facility requested for inclusion in rate base, which was recorded in the fourth quarter 2017 as an additional charge to income of approximately $78 million ($85 million net of accumulated depreciation of $7 million) pre-tax ($48 million after tax).
Under the Kemper Settlement Agreement, retail customer rates will reflect a reduction of approximately $26.8 million annually and include no recovery for costs associated with the gasifier portion of the Kemper County energy facility in 2018 or at any future date. On February 12, 2018, Mississippi Power made the required compliance filing with the Mississippi PSC. The Kemper Settlement Agreement also requires (i) the CPCN for the Kemper County energy facility to be modified to limit it to natural gas combined cycle operation and (ii) Mississippi Power to file a reserve margin plan with the Mississippi PSC by August 2018.
During the third and fourth quarters of 2017, Mississippi Power recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during the suspension period prior to conclusion of the Kemper Settlement Docket, as well as the charge associated with the Kemper Settlement Agreement. Additional pre-tax cancellation costs, including mine and plant closure and contract termination costs, currently estimated at approximately $50 million to $100 million (excluding salvage), are expected to be incurred in 2018. Mississippi Power has begun efforts to dispose of or abandon the mine and gasifier-related assets.
Total pre-tax charges to income related to the Kemper County energy facility were $3.4 billion ($2.4 billion after tax) for the year ended December 31, 2017. In the aggregate, since the Kemper County energy facility project started, Mississippi Power has incurred charges of $6.2 billion ($4.1 billion after tax) through December 31, 2017.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges.
PowerSecure. See Note 31 to the financial statements under "Kemper County Energy Facility""Goodwill and Other Intangible Assets" for additional information.
Plant Vogtle Units 3 and 4 StatusGain on Dispositions, Net
In 2009,2022, a $14 million gain was recorded at the Georgia PSC certified construction of Plant Vogtle Units 3 and 4. In 2012, the NRC issued the related combined construction and operating licenses, which allowed full constructionparent company as a result of the two AP1000 nuclear units (with electric generating capacityearly termination of the transition services agreement related to the 2019 sale of Gulf Power.
Interest Expense
Interest expense for these other business activities increased $171 million, or 24.7%, in 2023 as compared to 2022. The increase primarily results from parent company financing activities and includes approximately 1,100 MWs each)$112 million related to higher interest rates and $73 million related facilities to begin. Until March 2017, construction on Plant Vogtle Unitshigher average outstanding borrowings. See Note 8 to the financial statements for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Other Income (Expense), Net
Other income (expense), net for these other business activities increased $39 million, or 70.9%, in 2023 as compared to 2022 primarily due to a $29 million decrease in charitable donations and a $12 million increase in interest income, both primarily at the parent company. See Note 15 to the financial statements under "Southern Company" for additional information.
Income Taxes (Benefit)
The income tax benefit for these other business activities increased $65 million, or 27.9%, in 2023 as compared to 2022. The increase was primarily due to a $35 million tax benefit in 2023 related to a reversal of an uncertain tax position associated with the 2019 sale of Gulf Power and higher pre-tax losses, both at the parent company.
Alabama Power
Alabama Power's 2023 net income after dividends on preferred stock was $1.37 billion, representing a $30 million, or 2.2%, increase from 2022. The increase was primarily due to a decrease in income tax expense, an increase in Rate CNP Compliance revenues, a decrease in operations and maintenance expenses primarily related to the reliability reserve, and a lower Rate RSE customer refund accrual in 2023 compared to 2022. These increases to net income were offset by an increase in depreciation rates effective January 2023, a decrease in retail revenues associated with milder weather in Alabama Power's service territory in the first and second quarters of 2023 compared to the corresponding periods in 2022, and increases in capacity-related expenses and interest expense. See Note 2 to the financial statements under "Alabama Power" for additional information.
A condensed income statement for Alabama Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$7,050 $(767)
Fuel1,299 (541)
Purchased power504 (297)
Other operations and maintenance1,769 (166)
Depreciation and amortization1,401 526 
Taxes other than income taxes442 18 
Total operating expenses5,415 (460)
Operating income1,635 (307)
Allowance for equity funds used during construction82 12 
Interest expense, net of amounts capitalized425 43 
Other income (expense), net159 15 
Income taxes81 (342)
Net income1,370 19 
Dividends on preferred stock (11)
Net income after dividends on preferred stock$1,370 $30 
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Operating Revenues
Operating revenues for 2023 were $7.1 billion, reflecting a $767 million, or 9.8%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$6,470 
Estimated change resulting from —
Rates and pricing276 
Sales decline(33)
Weather(84)
Fuel and other cost recovery(470)
Retail — current year$6,159 $6,470 
Wholesale revenues —
Non-affiliates424 726 
Affiliates60 202 
Total wholesale revenues484 928 
Other operating revenues407 419 
Total operating revenues$7,050 $7,817 
Retail revenues decreased $311 million, or 4.8%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The decrease was primarily due to a decrease in fuel and other cost recovery, partially offset by an increase in revenues associated with rates and pricing primarily due to an increase in Rate CNP Compliance revenues and a lower Rate RSE customer refund accrual in 2023 compared to 2022.
See Note 2 to the financial statements under "Alabama Power – Rate ECR," " – Rate RSE," and " – Rate CNP Compliance" for additional information. See "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates include provisions to recognize the recovery of fuel costs, purchased power costs, PPAs certificated by the Alabama PSC, and costs associated with the NDR. Under these provisions, fuel and other cost recovery revenues generally equal fuel and other cost recovery expenses and do not affect net income. See Note 2 to the financial statements under "Alabama Power" for additional information.
Wholesale revenues from sales to non-affiliated utilities were as follows:
20232022
(in millions)
Capacity and other$163 $213 
Energy261 513 
Total non-affiliated$424 $726 
In 2023, wholesale revenues from sales to non-affiliates decreased $302 million, or 41.6%, as compared to 2022. The decrease reflects a 26.0% decrease in the volume of KWHs sold as a result of power sales agreements that ended in May 2023 and a 20.8% decrease in the price of energy primarily as a result of lower natural gas prices.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Alabama Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and Subsidiary Companies 2017 Annual Report


3 and 4 continued under the Vogtle 3 and 4 Agreement, which was a substantially fixed price agreement. On March 29, 2017, the EPC Contractor filed for bankruptcy protection under Chapter 11availability of the U.S. Bankruptcy Code.Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affect net income. Short-term opportunity energy sales are also included in wholesale energy sales to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Alabama Power's variable cost to produce the energy.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
In connection2023, wholesale revenues from sales to affiliates decreased $142 million, or 70.3%, as compared to 2022. The revenue decrease reflects a 47.7% decrease in the price of energy due to lower natural gas prices and a 42.9% decrease in KWH sales due to lower customer demand as a result of milder weather in 2023.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales and purchases are made in accordance with the EPC Contractor's bankruptcy filing,IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through Alabama Power's energy cost recovery clause.
In 2023, other operating revenues decreased $12 million, or 2.9%, as compared to 2022 primarily due to decreases of $25 million in cogeneration steam revenue associated with lower natural gas prices and $17 million in rent revenues, partially offset by a $34 million increase in unregulated sales of products and services.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change(*)
(in billions)
Residential17.4 (5.7)%(0.9)%
Commercial12.9 (1.2)0.4 
Industrial20.4 (2.8)(2.8)
Other0.1 (15.5)(15.5)
Total retail50.8 (3.4)(1.3)%
Wholesale
Non-affiliates9.3 (26.0)
Affiliates2.1 (42.9)
Total wholesale11.4 (29.9)
Total energy sales62.2 (9.7)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from the normal temperature conditions. Normal temperature conditions are defined as those experienced in Alabama Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. In 2023, weather-adjusted residential KWH sales decreased 0.9% primarily due to decreased customer usage. Weather-adjusted commercial KWH sales increased 0.4% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 2.8% as a result of a decrease in demand resulting from changes in production levels primarily in the chemicals and forest products sectors.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies related to changes in price and KWH sales.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, Alabama Power purchases a portion of its electricity needs from the wholesale market.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Details of Alabama Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
54.558.3 
Total purchased power (in billions of KWHs)
10.811.6 
Sources of generation (percent)(a)
Coal35 46 
Gas31 24 
Nuclear27 22 
Hydro7 
Cost of fuel, generated (in cents per net KWH)
Coal3.46 3.39 
Gas(a)
2.99 5.12 
Nuclear0.69 0.67 
Average cost of fuel, generated (in cents per net KWH)(a)
2.50 3.19 
Average cost of purchased power (in cents per net KWH)(b)
4.98 8.00 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by Alabama Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $1.8 billion in 2023, a decrease of $838 million, or 31.7%, compared to 2022. The decrease was primarily due to a $674 million decrease in the average cost of fuel and purchased power and a $164 milliondecrease related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through Alabama Power's energy cost recovery clause. Alabama Power, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 2 to the financial statements under "Alabama Power – Rate ECR" for additional information.
Fuel
Fuel expense was $1.3 billion in 2023, a decrease of $541 million, or 29.4%, compared to 2022. The decrease was primarily due to a 41.6% decrease in the average cost of natural gas per KWH generated, which excludes tolling agreements, and a 29.1% decrease in the volume of KWHs generated by coal, partially offset by a 21.2% increase in the volume of KWHs generated by natural gas, an 18.9% decrease in the volume of KWHs generated by hydro facilities as a result of less rainfall in 2023, and a 13.6% increase in the volume of KWHs generated by nuclear.
Purchased Power Non-Affiliates
Purchased power expense from non-affiliates was $253 million in 2023, a decrease of $188 million, or 42.6%, compared to 2022. The decrease was primarily due to a 32.9% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 25.5% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power Affiliates
Purchased power expense from affiliates was $251 million in 2023, a decrease of $109 million, or 30.3%, compared to 2022. The decrease was primarily due to a 51.4% decrease in the average cost per KWH purchased primarily due to lower natural gas prices, partially offset by a 43.4% increase in the volume of KWHs purchased due to the availability of lower cost gas generation in the Southern Company system.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $166 million, or 8.6%, in 2023 as compared to 2022. The change was primarily due to a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred, as well as decreases of $33 million in transmission and distribution expenses and $21 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $30 million in technology infrastructure and application production costs and $25 million in expenses related to unregulated products and services, as well as a $14 million decrease in nuclear property insurance refunds. See Note 2 to the financial statements under "Alabama Power – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $526 million, or 60.1%, in 2023 as compared to 2022 primarily due to an increase in depreciation rates effective in 2023. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $12 million, or 17.1%, in 2023 as compared to 2022 primarily due to increases in capital expenditures related to hydro production and Plant Barry Unit 8 construction. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $43 million, or 11.3%, in 2023 as compared to 2022. The increase reflects approximately $30 million related to higher average outstanding borrowings and $20 million related to higher interest rates. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $15 million, or 10.4%, in 2023 as compared to 2022 primarily due to a decrease in non-operating benefit-related expenses and an increase in interest income, partially offset by a decrease in non-service cost-related retirement benefits income. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $342 million, or 80.9%, in 2023 as compared to 2022 primarily due to a $252 million increase in the flowback of certain excess deferred income taxes and an $84 million decrease due to lower pre-tax earnings. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" and Note 10to the financial statements for additional information.
Georgia Power
Georgia Power's 2023 net income was $2.1 billion, representing a $0.3 billion, or 14.7%, increase from the previous year. The increase was primarily due to lower non-fuel operations and maintenance costs, revenue reductions in 2022 as a result of Georgia Power acting for itself and as agent forexceeding its allowed retail return range, a $187 million decrease in after-tax charges related to the Vogtle Owners, entered into the Interim Assessment Agreement with the EPC Contractor to allow construction to continue. The Interim Assessment Agreement expired on July 27, 2017 when the Vogtle Services Agreement became effective. In August 2017, following completion of comprehensive cost to complete and cancellation cost assessments, Georgia Power filed its seventeenth VCM report with the Georgia PSC, which included a recommendation to continue construction of Plant Vogtle Units 3 and 4, and an increase in other revenues, partially offset by a decrease in retail revenues associated with Southern Nuclear servinglower contributions from customers with variable demand-driven pricing and milder weather in 2023, as project manager and Bechtel servingwell as higher interest expense. Also contributing to the primary construction contractor. On December 21, 2017,net income growth were the Georgia PSC approved Georgia Power's recommendation to continue construction.
Georgia Power expects Plant Vogtle Units 3 and 4 to be placed in service by November 2021 and November 2022, respectively. Georgia Power's revised capital cost forecast for its 45.7% proportionate share of Plant Vogtle Units 3 and 4 is $8.8 billion ($7.3 billion after reflecting the impact of payments received under a settlement agreement regarding the Toshiba Guarantee (Guarantee Settlement Agreement) and certain refunds to customers ordered by the Georgia PSC (Customer Refunds)). Georgia Power's CWIP balance for Plant Vogtle Units 3 and 4 was $3.3 billion at December 31, 2017, which is netimpacts of the Guarantee Settlement Agreement payments less the Customer Refunds. Georgia Power estimates that its financing costs for construction of Plant Vogtle Units 32022 ARP effective January 1, 2023, including increased retail rates, largely offset by higher depreciation and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
amortization. See Note 32 to the financial statements under "Nuclear Construction""Georgia Power" for additional information.
Earnings
Consolidated net income attributable to Southern Company was $842 million in 2017, a decrease of $1.6 billion, or 65.6%, from the prior year. The decrease was primarily due to pre-tax charges of $3.4 billion ($2.4 billion after tax) related to the Kemper IGCC at Mississippi Power. Also contributing to the change were increases of $240 million in net income from Southern Company Gas (excluding the impact of $111 million in additional expense related to the Tax Reform Legislation) reflecting the 12-month period in 2017 compared to the six-month period following the Merger closing on July 1, 2016, $264 million related to net tax benefits from the Tax Reform Legislation, higher retail electric revenues resulting from increases in base rates partially offset by milder weather and lower customer usage, and increases in renewable energy sales at Southern Power. These increases were partially offset by higher interest and depreciation and amortization.
Consolidated net income attributable to Southern Company was $2.4 billion in 2016, an increase of $81 million, or 3.4%, from the prior year. Consolidated net income increased by $114 million as a result of earnings from Southern Company Gas, which was acquired on July 1, 2016. Also contributing to the increase were higher retail electric revenues resulting from non-fuel retail rate increases and warmer weather, primarily in the third quarter 2016, as well as the 2015 correction of a Georgia Power billing error, partially offset by accruals in 2016 for expected refunds at Alabama Power and Georgia Power. Additionally, the increase was due to increases in income tax benefits and renewable energy sales at Southern Power. These increases were partially offset by higher interest expense, non-fuel operations and maintenance expenses, depreciation and amortization, lower wholesale capacity revenues, and higher estimated losses associated with the Kemper IGCC.
See Note 12 to the financial statements under "Southern CompanyMerger with Southern Company Gas" for additional information regarding the Merger.
Basic EPS was $0.84 in 2017, $2.57 in 2016, and $2.60 in 2015. Diluted EPS, which factors in additional shares related to stock-based compensation, was $0.84 in 2017, $2.55 in 2016, and $2.59 in 2015. EPS for 2017 was negatively impacted by $0.04 per share as a result of an increase in the average shares outstanding. See FINANCIAL CONDITION AND LIQUIDITY – "Financing Activities" herein for additional information.
Dividends
Southern Company has paid dividends on its common stock since 1948. Dividends paid per share of common stock were $2.30 in 2017, $2.22 in 2016, and $2.15 in 2015. In January 2018, Southern Company declared a quarterly dividend of 58 cents per share. This is the 281st consecutive quarter that Southern Company has paid a dividend equal to or higher than the previous quarter. For 2017, the dividend payout ratio was 273% compared to 86% for 2016. The increase was due to a significant reduction in earnings resulting from charges related to the Kemper IGCC. See "Earnings" and RESULTS OF OPERATIONS – "Electricity Business – Estimated Loss on Kemper IGCC" herein and Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


RESULTS OF OPERATIONS
Discussion of the results of operations is divided into three parts – the Southern Company system's primary business of electricity sales, its gas business, and its other business activities.
 Amount
 2017 2016 2015
 (in millions)
Electricity business$878
 $2,571
 $2,401
Gas business243
 114
 
Other business activities(279) (237) (34)
Net Income$842
 $2,448
 $2,367
Electricity Business
Southern Company's electric utilities generate and sell electricity to retail and wholesale customers.
A condensed income statement of income for the electricity businessGeorgia Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$10,118 $(1,466)
Fuel1,781 (705)
Purchased power1,281 (976)
Other operations and maintenance2,083 (266)
Depreciation and amortization1,681 251 
Taxes other than income taxes541 14 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total operating expenses7,299 (1,933)
Operating income2,819 467 
Allowance for equity funds used during construction165 25 
Interest expense, net of amounts capitalized626 141 
Other income (expense), net170 (6)
Income taxes (benefit)448 78 
Net income$2,080 $267 
 Amount 
Increase (Decrease)
from Prior Year
 2017 2017 2016
 (in millions)
Electric operating revenues$18,540
 $599
 $499
Fuel4,400
 39
 (389)
Purchased power863

113
 105
Cost of other sales69
 11
 58
Other operations and maintenance4,340
 (183) 231
Depreciation and amortization2,457
 224
 213
Taxes other than income taxes1,063
 24
 44
Estimated loss on Kemper IGCC3,362
 2,934
 63
Total electric operating expenses16,554
 3,162
 325
Operating income1,986
 (2,563) 174
Allowance for equity funds used during construction152
 (48) (26)
Interest expense, net of amounts capitalized1,011
 80
 157
Other income (expense), net(83) (8) (43)
Income taxes82
 (1,009) (235)
Net income962
 (1,690) 183
Less:     
Dividends on preferred and preference stock of subsidiaries38
 (7) (9)
Net income attributable to noncontrolling interests46
 10
 22
Net Income Attributable to Southern Company$878
 $(1,693) $170
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


Electric Operating Revenues
Electric operatingOperating revenues for 20172023 were $18.5$10.1 billion, reflecting a $599 million increase$1.5 billion, or 12.7%, decrease from 2016.2022. Details of electric operating revenues were as follows:
20232022
(in millions)
Retail — prior year$10,792 
Estimated change resulting from —
Rates and pricing172 
Sales decline(10)
Weather(141)
Fuel cost recovery(1,591)
Retail — current year$9,222 $10,792 
Wholesale revenues188 235 
Other operating revenues708 557 
Total operating revenues$10,118 $11,584 
 Amount
 2017 2016
 (in millions)
Retail electric — prior year$15,234
 $14,987
Estimated change resulting from —   
Rates and pricing508
 427
Sales decline(71) (35)
Weather(281) 153
Fuel and other cost recovery(60) (298)
Retail electric — current year15,330
 15,234
Wholesale electric revenues2,426
 1,926
Other electric revenues681
 698
Other revenues103
 83
Electric operating revenues$18,540
 $17,941
Percent change3.3% 2.9%
Retail electric revenues increased $96 million,decreased $1.6 billion, or 0.6%14.5%, in 20172023 as compared to the prior year.2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing in 2017 was primarily due to base tariff increases in accordance with the 2022 ARP and revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed retail ROE range, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a Rate RSE increase at Alabama Power effectivedecrease in January 2017, the recovery of Plant Vogtle Units 3 and 4 construction financing costsrevenues recognized under the NCCR tariff at Georgia Power, and an increase in retail base rates effective July 2017 at Gulf Power.tariff. See Note 32 to the financial statements under "Regulatory Matters"Georgia PowerGulf PowerRate Plans" and "Retail Base Rate Cases"Nuclear Construction" for additional information.
Retail electric revenues increased $247 million, or 1.6%, in 2016 as compared to the prior year. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing in 2016 was primarily due to increases in base tariffs at Georgia Power under the 2013 ARP and the NCCR tariff and increased revenues at Alabama Power under Rate CNP Compliance, all effective January 1, 2016. Also contributing to the increase in rates and pricing for 2016 was the 2015 correction of an error affecting billings since 2013 to a small number of large commercial and industrial customers under a rate plan allowing for variable demand-driven pricing at Georgia Power and the implementation of rates at Mississippi Power for certain Kemper County energy facility in-service assets, effective September 2015. These increases were partially offset by accruals in 2016 for expected refunds at Alabama Power and Georgia Power. See Note 3 to the financial statements under "Kemper County Energy FacilityRate Recovery" for additional information.
See Note 3 to the financial statements under "Regulatory MattersAlabama PowerRate RSE" and " – Rate CNP Compliance" and "Nuclear Construction" and Note 1 to the financial statements under "General" for additional information. Also see "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales decline and weather.weather in 2023.
Electric rates for the traditional electric operating companies include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses including the energy component of PPA costs, and do not affect net income. The traditional electric operating companies each have one or more regulatory mechanismsSee Note 2 to recover other costs such as environmental and other compliance costs, storm damage, new plants, and PPA capacity costs.the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Wholesale electric revenues from power sales were as follows:
20232022
(in millions)
Capacity and other$66 $48 
Energy122 187 
Total$188 $235 
In 2023, wholesale revenues decreased $47 million, or 20.0%, as compared to 2022 largely due to an $81 million decrease related to the average cost per KWH sold due to lower Southern Company system fuel and purchased power costs, partially offset by a $21 million increase related to new capacity contracts and a $13 million increase related to the volume of KWH sales associated with higher market demand.
Wholesale revenues from sales to non-affiliates consist of PPAs primarily with investor-owned utilities and electric cooperatives and short-term opportunity sales. Wholesale electric revenues from PPAs (other than solar and wind PPAs) have both capacity and energy components. CapacityWholesale capacity revenues generally representfrom PPAs are recognized in amounts billable under the greatest contribution to net incomecontract terms and are designed to provide for recovery of fixed costs plusand a return on investment. EnergyWholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Georgia Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above Georgia Power's variable cost of energy.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues increased $151 million, or 27.1%, as compared to 2022 primarily due to an increase of $105 million in unregulated sales associated with power delivery construction and maintenance, outdoor lighting, and energy conservation projects, a net increase of $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs, an increase of $17 million in retail solar program fees, and a $9 million increase in open access transmission tariff sales.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential27.6 (5.0)%(0.4)%
Commercial32.6 0.1 1.2 
Industrial23.5 (1.6)(1.4)
Other0.4 (4.7)(4.2)
Total retail84.1 (2.1)(0.1)%
Wholesale2.6 7.8 
Total energy sales86.7 (1.9)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Georgia Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. Weather-adjusted residential sales decreased 0.4% primarily due to decreased customer usage, largely offset by customer growth. Weather-adjusted commercial KWH sales increased 1.2% primarily due to customer growth. Weather-adjusted industrial KWH sales decreased
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1.4% primarily due to decreases in the textile, mining, and stone, clay, and glass sectors, partially offset by an increase in the paper sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for Georgia Power. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Georgia Power purchases a portion of its electricity needs from the wholesale market.
Details of Georgia Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
60.359.7 
Total purchased power (in billions of KWHs)
29.633.6 
Sources of generation (percent) —
Gas49 48 
Nuclear(a)
29 27 
Coal19 21 
Hydro and other3 
Cost of fuel, generated (in cents per net KWH)
Gas3.07 5.06 
Nuclear(a)
0.82 0.75 
Coal5.59 4.12 
Average cost of fuel, generated (in cents per net KWH)(a)
2.90 3.64 
Average cost of purchased power (in cents per net KWH)(b)
4.63 7.88 
(a)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(b)Average cost of purchased power includes fuel purchased by Georgia Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $3.1 billion in 2023, a decrease of $1.7 billion, or 35.4%, compared to 2022. The decrease was due to decreases of $1.4 billion related to the average cost of fuel and purchased power and $321 million related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through Georgia Power's fuel cost recovery mechanism. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Fuel
Fuel expense was $1.8 billion in 2023, a decrease of $0.7 billion, or 28.4%, compared to 2022. The decrease was primarily due to decreases of 39.3% in the average cost per KWH generated by natural gas and 8.9% in the volume of KWHs generated by coal, partially offset by increases of 35.7% in the average cost per KWH generated by coal, 9.3% in the average cost per KWH generated by nuclear, 8.5% in the volume of KWHs generated by nuclear, and 2.1% in the volume of KWHs generated by natural gas.
Purchased Power – Non-Affiliates
Purchased power expense from non-affiliates was $517 million in 2023, a decrease of $339 million, or 39.6%, compared to 2022. The decrease was primarily due to a decrease of 33.9% in the volume of KWHs purchased due to lower demand and the availability of lower cost generation in the Southern Company system and a decrease of 22.3% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
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Purchased Power – Affiliates
Purchased power expense from affiliates was $764 million in 2023, a decrease of $637 million, or 45.5%, compared to 2022. The decrease was primarily due to a decrease of 49.1% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $266 million, or 11.3%, in 2023 as compared to 2022. The decrease was primarily due to decreases of $182 million in storm damage recovery as authorized in the 2022 ARP, $178 million in transmission and distribution expenses primarily associated with line maintenance, $74 million in generation non-outage maintenance expenses, and $28 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $60 million from unregulated power delivery construction and maintenance and energy conservation projects, $59 million in generation environmental projects, $55 million in technology infrastructure and application production costs, and $28 million in planned generation outages. See Note 2 to the financial statements under "Georgia Power – Storm Damage Recovery" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $251 million, or 17.6%, in 2023 as compared to 2022 primarily due to increases of $190 million resulting from higher depreciation rates as authorized in the 2022 ARP and $75 million associated with additional plant in service, partially offset by a decrease of $15 million in amortization of regulatory assets related to the retirement of certain generating units that ended in 2022.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $14 million, or 2.7%, in 2023 as compared to 2022 primarily due to an increase of $56 million in property taxes primarily resulting from an increase in the assessed value of property, largely offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $25 million, or 17.9%, in 2023 as compared to 2022 primarily due to an increase in capital expenditures subject to AFUDC.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $141 million, or 29.1%, in 2023 as compared to 2022. The increase primarily reflects approximately $78 million related to higher interest rates and $76 million related to higher average outstanding borrowings, partially offset by the deferral of $14 million in financing costs related to Plant Vogtle Unit 3. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information. Also see Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
Other Income (Expense), Net
Other income (expense), net decreased $6 million, or 3.4%, in 2023 as compared to 2022 primarily due to decreases in non-service cost-related retirement benefits income and customer charges related to contributions in aid of construction, partially offset by a decrease in charitable donations. See Note 11 to the financial statements for additional information on Georgia Power's net periodic pension and other postretirement benefit costs.
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Income Taxes (Benefit)
Income taxes increased $78 million, or 21.1%, in 2023 as compared to 2022 primarily due to the flowback of $145 million of certain excess deferred income taxes that ended in 2022 and higher pre-tax earnings largely resulting from lower charges associated with the construction of Plant Vogtle Units 3 and 4, partially offset by an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards, generation of $35 million of advanced nuclear PTCs, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" and Note 10to the financial statements for additional information.
Mississippi Power
Mississippi Power's net income was $188 million in 2023 compared to $164 million in 2022. The increase was primarily due to an increase in affiliate wholesale capacity revenues, changes in power supply agreements, and a decrease in non-fuel operations and maintenance expenses, partially offset by an increase in interest expense.
A condensed income statement for Mississippi Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$1,474 $(220)
Fuel and purchased power538 (251)
Other operations and maintenance362 (14)
Depreciation and amortization190 9 
Taxes other than income taxes124  
Total operating expenses1,214 (256)
Operating income260 36 
Interest expense, net of amounts capitalized71 15 
Other income (expense), net35 2 
Income taxes36 (1)
Net income$188 $24 
Operating Revenues
Operating revenues for 2023 were $1.5 billion, reflecting a $220 million, or 13.0%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$935 
Estimated change resulting from —
Rates and pricing(11)
Sales growth11 
Weather(4)
Fuel and other cost recovery32 
Retail — current year$963 $935 
Wholesale revenues —
Non-affiliates272 252 
Affiliates200 460 
Total wholesale revenues472 712 
Other operating revenues39 47 
Total operating revenues$1,474 $1,694 
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Total retail revenues for 2023 increased $28 million, or 3.0%, compared to 2022 primarily due to higher recoverable fuel costs and an increase in customer usage, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and lower revenues associated with a tolling arrangement accounted for as a sales-type lease. See Notes 2 and 9 to the financial statements under "Mississippi Power" and "Lessor," respectively, for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates for Mississippi Power include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not affect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside Mississippi Power's service territory. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" for additional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
20232022
(in millions)
Capacity and other$21 $
Energy251 249 
Total non-affiliated$272 $252 
Wholesale revenues from sales to non-affiliates increased $20 million, or 7.9%, compared to 2022. The increase was primarily due to capacity revenues associated with new capacity contracts in 2023.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Mississippi Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. In addition, Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023. Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Mississippi Power's variable cost to produce the energy. See Note 2 under "Mississippi Power – Municipal and Rural Associations Tariff" for additional information.
Wholesale revenues from sales to affiliates decreased $260 million, or 56.5%, in 2023 compared to 2022. The decrease was primarily due to a $293 million decrease associated with lower natural gas prices, partially offset by a $23 million increase in capacity revenues resulting from availability of generation reserves and an increase in pricing and a $10 million increase associated with higher KWH sales.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. The energy portion of these transactions does not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues decreased $8 million, or 17.0%, as compared to 2022 primarily due to decreases of $5 million in unregulated sales associated with power delivery construction and maintenance projects and $3 million in open access transmission tariff revenues.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted Percent Change(*)
(in millions)
Residential2,092 (1.9)%0.7 %
Commercial2,815 7.0 7.1 
Industrial4,721 0.7 0.7 
Other28 (11.1)(11.1)
Total retail9,656 1.8 %2.5 %
Wholesale
Non-affiliated3,836 10.7 
Affiliated5,612 2.2 
Total wholesale9,448 5.5 
Total energy sales19,104 3.6 %
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Mississippi Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales increased in 2023 when compared to 2022. Weather-adjusted residential KWH sales increased 0.7% due to an increase in customer usage. Weather-adjusted commercial KWH sales increased 7.1% primarily due to customer growth. Industrial KWH sales increased 0.7% primarily due to an increase in the non-manufacturing sector, partially offset by a decrease in the chemicals sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Mississippi Power purchases a portion of its electricity needs from the wholesale market.
Details of Mississippi Power's generation and purchased power were as follows:
20232022
Total generation (in millions of KWHs)
18,789 18,303 
Total purchased power (in millions of KWHs)
524 617 
Sources of generation (percent) –
Gas92 90 
Coal8 10 
Cost of fuel, generated (in cents per net KWH) –
Gas2.68 4.34 
Coal5.46 4.13 
Average cost of fuel, generated (in cents per net KWH)
2.90 4.31 
Average cost of purchased power (in cents per net KWH)
4.27 6.91 
Fuel and purchased power expenses were $538 million in 2023, a decrease of $251 million, or 31.8%, as compared to 2022. The decrease was primarily due to a $266 million decrease related to the average cost of fuel and purchased power, partially offset by a $15 million net increase related to the volume of KWHs generated and purchased.
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Fuel and purchased power energy transactions do not have a significant impact on earnings since energy expenses are generally offset by energy revenues through Mississippi Power's fuel cost recovery clauses. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" and Note 1 to the financial statements under "Fuel Costs" for additional information.
Fuel expense decreased $230 million, or 30.8%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost of natural gas per KWH generated and a 20.3% decrease in the volume of KWHs generated by coal, partially offset by a 32.2% increase in the average cost of coal per KWHs generated and a 5.4% increase in the volume of KWHs generated by natural gas.
Purchased power expense decreased $21 million, or 49.9%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 15.1% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $14 million, or 3.7%, in 2023 compared to 2022. The decrease was primarily due to decreases of $14 million in reliability reserve accruals, $7 million in generation expenses, and $6 million in unregulated power delivery construction and maintenance projects, partially offset by increases of $5 million in storm reserve accruals and $2 million in certain employee compensation and benefit expenses. See Note 2 to the financial statements under "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $9 million, or 5.0%, in 2023 compared to 2022 primarily due to an increase in depreciation associated with additional plant in service.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $15 million, or 26.8%, in 2023 compared to 2022. The increase was primarily due to increases of approximately $10 million related to higher interest rates and $5 million related to higher average outstanding borrowings. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information.
Income Taxes
Income taxes decreased $1 million, or 2.7%, in 2023 compared to 2022 primarily due to a decrease of $7 million associated with the flowback of certain excess deferred income taxes associated with new PEP rates that became effective in April 2023, largely offset by an increase of $6 million associated with higher pre-tax earnings. See Note 2 to the financial statements under "Mississippi Power – Performance Evaluation Plan" and Note 10 to the financial statements for additional information.
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Southern Power
Net income attributable to Southern Power for 2023 was $357 million, a $3 million increase from 2022. The increase was primarily due to higher HLBV income associated with tax equity partnerships, an arbitration award received for losses previously incurred, a gain on the sale of spare parts, and receipts of liquidated damages and insurance proceeds related to generation facility production and equipment, as well as changes in state apportionment methodology related to tax legislation enacted by the State of Tennessee. These increases were largely offset by lower revenues driven by lower market prices of energy.
A condensed statement of income follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$2,189 $(1,180)
Fuel706 (908)
Purchased power116 (195)
Other operations and maintenance473 (9)
Depreciation and amortization504 (12)
Taxes other than income taxes51 2 
Loss on sales-type leases (1)
Gain on dispositions, net(20)(18)
Total operating expenses1,830 (1,141)
Operating income359 (39)
Interest expense, net of amounts capitalized129 (9)
Other income (expense), net12 5 
Income taxes (benefit)12 (8)
Net income230 (17)
Net loss attributable to noncontrolling interests(127)(20)
Net income attributable to Southern Power$357 $3 
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company power pool.
Natural Gas Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to operating income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of Southern Power's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have a capacity charge and customersrevenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or throughpay a fixed price related to the energy.energy generated from the respective facility and sold to the grid. As a
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result, Southern Company and Subsidiary Companies 2017 Annual Report


result, the Company'sPower's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Wholesale electric
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See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.
Operating Revenues Details
Details of Southern Power's operating revenues at Mississippi Power include FERC-regulated municipal and rural association sales as well as market-based sales. Short-term opportunity sales are made at market-based rates that generally provide a margin above the Southern Company system's variable cost to produce the energy.
Wholesale electric revenues from power sales were as follows:
20232022
(in millions)
PPA capacity revenues$471 $451 
PPA energy revenues1,227 2,121 
Total PPA revenues1,698 2,572 
Non-PPA revenues436 761 
Other revenues55 36 
Total operating revenues$2,189 $3,369 
 2017 2016 2015
 (in millions)
Capacity and other$838
 $771
 $875
Energy1,588
 1,155
 923
Total$2,426
 $1,926
 $1,798
In 2017, wholesaleOperating revenues increased $500 million,for 2023 were $2.2 billion, a $1.2 billion, or 26.0%, as compared to the prior year due to a $433 million increase35.0% decrease from 2022. The change in energy revenues and a $67 million increase in capacity revenues, primarily at Southern Power. The increase in energy revenues was primarily due to increases in renewable energy sales arising from new solar and wind facilities and non-PPA revenues from short-term sales. The increase in capacity revenues was primarily due to a PPA related to new natural gas facilities and additional customer capacity requirements.
In 2016, wholesale revenues increased $128 million, or 7.1%, as compared to the prior year due to a $232 million increase in energy revenues, partially offset by a $104 million decrease in capacity revenues. The increase in energy revenues was primarily due to increases in short-term sales and renewable energy sales at Southern Power, partially offset by lower fuel prices. The decrease in capacityoperating revenues was primarily due to the expirationfollowing:
PPA capacity revenuesincreased $20 million, or 4.4%, primarily due to an increase associated with a change in rates from new and existing natural gas PPAs.
PPA energy revenues decreased $894 million, or 42.1%, primarily due to a $904 million decrease in sales under natural gas PPAs resulting from a $726 million decrease in the price of fuel and purchased power and a $178 million decrease in the volume of KWHs sold.
Non-PPA revenues decreased $325 million, or 42.7%, primarily due to a $650 million decrease in the market price of energy, partially offset by a $321 million increase in the volume of KWHs sold through short-term sales.
Other revenues increased $19 million, or 52.8%, primarily due to receipts of liquidated damages associated with generation facility production guarantees, an arbitration award received for losses previously incurred, and business interruption insurance proceeds for damaged generation equipment. See Note 3 to the financial statements under "General Litigation Matters – Southern Power" for additional information.
Fuel and Purchased Power Expenses
Details of Southern Power's generation and purchased power were as follows:
Total
KWHs
Total KWH % ChangeTotal
KWHs
20232022
(in billions of KWHs)
Generation4948
Purchased power33
Total generation and purchased power522.0%51
Total generation and purchased power (excluding solar, wind, fuel cells, and tolling agreements)
336.5%31
Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
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Details of Southern Power's fuel and purchased power expenses were as follows:
20232022
(in millions)
Fuel$706 $1,614 
Purchased power116 311 
Total fuel and purchased power expenses$822 $1,925 
In 2023, total fuel and purchased power expenses decreased $1.1 billion, or 57.3%, compared to 2022. Fuel expensedecreased $908 million, or 56.3%, primarily due to a $1.0 billion decrease associated with the average cost of fuel. Purchased power expense decreased $195 million, or 62.7%, primarily due to a $206 million decrease associated with the average cost of purchased power.
Gain on Dispositions, Net
In 2023, gain on dispositions, net increased $18 million compared to 2022 primarily due to a $16 million gain on the sale of spare parts in 2023.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized decreased $9 million, or 6.5%, compared to 2022. The decrease was primarily due to lower average outstanding borrowings.
Income Taxes (Benefit)
In 2023, income taxes decreased $8 million, or 40.0%, compared to 2022. The decrease was primarily due to a change in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in the second quarter 2023. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate," respectively, for additional information.
Net Loss Attributable to Noncontrolling Interests
In 2023, net loss attributable to noncontrolling interests increased $20 million, or 18.7%, compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to wind tax equity partners and $5 million in lower income allocations to equity partners, partially offset by $10 million in lower HLBV loss allocations to battery energy storage partners.
Southern Company Gas
Southern Company Gas has various regulatory mechanisms, such as weather and revenue normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of its utility's respective service territory. Southern Company Gas also utilizes weather hedges to limit the negative income impacts in the event of warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. Therefore, weather typically does not have a significant net income impact.
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas and bad debt expense, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing Southern Company Gas' annual results. Thus, Southern Company Gas' operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
Percent Generated During
Heating Season
Operating RevenuesNet
Income
202367 %73 %
202267 %66 %
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Net Income
Net income attributable to Southern Company Gas in 2023 was $615 million, an increase of $43 million, or 7.5%, compared to 2022. Net income increased primarily as a result of an impairment charge in 2022 related to the sale of natural gas storage facilities. The increase in net income was partially offset by a decrease of $29 million in net income at gas distribution operations primarily as a result of reduced revenue due to lower volumes sold, regulatory disallowances at Nicor Gas, and higher depreciation related to continued investment in infrastructure replacement programs, partially offset by lower cost of gas, and a $9 million decrease in net income at gas pipeline investments primarily as a result of higher expenses at SNG.
A condensed income statement for Southern Company Gas follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Earnings before income taxes826 74 
Income taxes211 31 
Net Income$615 $43 
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from
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customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Customer Count
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas distribution operations' and gas marketing services' customers are primarily located in Georgia and Illinois.
The following table provides the number of customers served by Southern Company Gas at December 31, 2023 and 2022:
20232022
(in thousands, except market share %)
Gas distribution operations4,374 4,358 
Gas marketing services
Energy customers665 622 
Market share of energy customers in Georgia30.0 %29.3 %
Southern Company Gas anticipates customer growth and uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at gas distribution operations represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
In 2023, cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
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Volumes of Natural Gas Sold
Southern Company Gas' natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas.
The following table details the volumes of natural gas sold during all periods presented:
2023 vs. 2022
20232022% Change
Gas distribution operations (mmBtu in millions)
Firm625 707 (11.6)%
Interruptible93 93  
Total718 800 (10.3)%
Gas marketing services (mmBtu in millions)
Firm:
Georgia33 35 (5.7)%
Other19 18 5.6 
Interruptible large commercial and industrial14 14  
Total66 67 (1.5)%
Other Operations and Maintenance Expenses
In 2023, other operations and maintenance expenses increased $18 million, or 1.5%, compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Depreciation and Amortization
In 2023, depreciation and amortization increased $23 million, or 4.1%, compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
In 2023, taxes other than income taxes decreased $20 million, or 7.1%, compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized increased $47 million, or 17.9%, compared to 2022. The increase reflects $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
In 2023, income taxes increased $31 million, or 17.2%, compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes
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related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Segment Information
20232022
Operating RevenuesOperating ExpensesNet Income (Loss)Operating RevenuesOperating ExpensesNet Income (Loss)
(in millions)(in millions)
Gas distribution operations$4,105 $3,301 $441 $5,267 $4,464 $470 
Gas pipeline investments32 10 98 32 11 107 
Gas marketing services548 418 91 638 505 94 
All other36 40 (15)55 190 (99)
Intercompany eliminations(19)(6) (30)(22)— 
Consolidated$4,702 $3,763 $615 $5,962 $5,148 $572 
Gas Distribution Operations
Gas distribution operations is the largest component of Southern Company Gas' business and is subject to regulation and oversight by regulatory agencies in each of the states it serves. These agencies approve natural gas rates designed to provide Southern Company Gas with the opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest expense, operations and maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, Southern Company Gas' second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. Southern Company Gas has various regulatory and other mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit its exposure to changes in customer consumption, including weather changes within typical ranges in its natural gas distribution utilities' service territories. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income decreased $29 million, or 6.2%, compared to 2022. Operating revenues decreased $1.2 billion primarily due to lower gas cost recovery and lower volumes sold, partially offset by rate increases and continued investment in infrastructure replacement. Gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas. Operating expenses decreased $1.2 billion primarily due to a $1.3 billion decrease in the cost of natural gas as a result of lower gas prices compared to 2022 and lower taxes other than income taxes, partially offset by $88 million related to the regulatory disallowances at Nicor Gas, higher depreciation resulting from additional assets placed in service, higher compensation and benefits expenses, and a $20 million increase related to energy service contracts. The decrease in operating expenses also includes costs passed through directly to customers, primarily related to bad debt expenses, energy efficiency programs, and revenue taxes. The decrease in net income also includes an increase of $46 million in interest expense, net of amounts capitalized primarily due to higher interest rates and higher average outstanding debt, partially offset by a $19 million decrease in income taxes primarily as a result of the tax benefit resulting from the regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Gas Pipeline Investments
Gas pipeline investments consists primarily of joint ventures in natural gas pipeline investments including SNG and Dalton Pipeline. In 2023, net income decreased $9 million compared to 2022. The decrease was primarily due to lower earnings at SNG resulting from higher expenses. See Note 7 to the financial statements under "Southern Company Gas" for additional information.
Gas Marketing Services
Gas marketing services provides energy-related products and services to natural gas markets and participants in customer choice programs that were approved in various states to increase competition. These programs allow customers to choose their natural gas supplier while the local distribution utility continues to provide distribution and transportation services. Gas marketing
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services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts.
In 2023, net income decreased $3 million, or 3.2%, compared to 2022. The decrease was due to a $90 million decrease in operating revenues primarily due to lower gas prices and the timing of unrealized hedge losses, largely offset by an $87 million decrease in operating expenses primarily related to a $106 million decrease in cost of gas, partially offset by higher compensation and benefits.
All Other
All other includes natural gas storage businesses, a renewable natural gas business, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the reportable segments and interest income (expense) associated with affiliate financing arrangements. All other included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income increased $84 million compared to 2022. The increase was primarily due to a decrease in operating expenses primarily related to pre-tax impairment charges in 2022 totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities, lower depreciation, lower cost of gas, and lower taxes other than income taxes, partially offset by a decrease in operating revenues of $19 million and an increase in income taxes. See Note 10 to the financial statements and Note 15 to the financial statements under "Southern Company Gas"for additional information.
FUTURE EARNINGS POTENTIAL
General
Prices for electric service provided by the traditional electric operating companies and natural gas distribution service provided by the natural gas distribution utilities to retail customers are set by state PSCs or other applicable state regulatory agencies under cost-based regulatory principles. Retail rates and earnings are reviewed through various regulatory mechanisms and/or processes and may be adjusted periodically within certain limitations. Effectively operating pursuant to these regulatory mechanisms and/or processes and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the traditional electric operating companies and natural gas distribution utilities for the foreseeable future. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Southern Power continues to focus on long-term PPAs. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 2 to the financial statements for additional information about regulatory matters.
Each Registrant's results of operations are not necessarily indicative of its future earnings potential. The level of the Registrants' future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Registrants' primary businesses of selling electricity and/or distributing natural gas, as described further herein.
For the traditional electric operating companies, these factors include the ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs during a time of increasing costs, including those related to projected long-term demand growth, stringent environmental standards, including CCR rules, safety, system reliability and resiliency, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants and expanding and improving the transmission and distribution systems; continued customer growth; and the trends of higher inflation and reduced electricity usage per customer, especially in residential and commercial markets. For Georgia Power, other major factors are completing construction and start-up of Plant Vogtle Unit 4 and meeting the related cost and schedule projections.
Earnings in the electricity business will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, which could contribute to a net reduction in customer usage.
Global and U.S. economic conditions continue to be affected by higher-than-expected inflation that arose from the COVID-19 pandemic and associated policy responses of governments and central banks. In response to elevated inflation levels, the U.S. Federal Reserve raised interest rates faster than any rate increase cycle in the last 40 years. The actions by the U.S. Federal Reserve have helped to slow the rate of inflation and curtail economic activity. Although target levels of inflation have yet to be achieved, the U.S. Federal Reserve has indicated its current intention to pause future rate increases and evaluate rate cuts in the near term. The shifting economic policy variables and weakening of historic relationships among economic activity, prices, and employment have increased the uncertainty of future levels of economic activity, which will directly impact future energy demand and operating costs. Weakening economic activity increases the risk of slowing or declining energy sales. See RESULTS OF OPERATIONS herein for information on energy sales in the Southern Company system's service territory during 2023.
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The level of future earnings for Southern Power's competitive wholesale electric business depends on numerous factors including the parameters of the wholesale market and the efficient operation of its wholesale generating assets; Southern Power's ability to execute its growth strategy through the development, construction, or acquisition of renewable facilities and other energy projects while containing costs; regulatory matters; customer creditworthiness; total electric generating capacity available in Southern Power's market areas; Southern Power's ability to successfully remarket capacity as current contracts expire; renewable portfolio standards; continued availability of federal and state ITCs and PTCs, which could be impacted by future tax legislation; transmission constraints; cost of generation from units within the Southern Company power pool; and operational limitations. See "Income Tax Matters" herein for information regarding the IRA's expansion of the availability of federal ITCs and PTCs. Also see Notes 10 and 15 to the financial statements for additional information.
The level of future earnings for Southern Company Gas' primary business of distributing natural gas and its complementary businesses in the gas pipeline investments and gas marketing services sectors depends on numerous factors. These factors include the natural gas distribution utilities' ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs, including those related to projected long-term demand growth, safety, system reliability and resiliency, natural gas, and capital expenditures, including expanding and improving the natural gas distribution systems; the completion and subsequent operation of ongoing infrastructure and other construction projects; customer creditworthiness; and certain policies to limit the use of natural gas, such as the potential in Illinois and across certain other parts of the U.S. for state or municipal bans on the use of natural gas or policies designed to promote electrification. The volatility of natural gas prices has an impact on Southern Company Gas' customer rates, its long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services business to capture value from locational and seasonal spreads. Additionally, changes in commodity prices, primarily driven by tight gas supplies, geopolitical events, and diminished gas production, subject a portion of Southern Company Gas' operations to earnings variability and may result in higher natural gas prices. Additional economic factors may contribute to this environment. The demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis. Alternatively, a significant drop in oil and natural gas prices could lead to a consolidation of natural gas producers or reduced levels of natural gas production.
Earnings for both the electricity and natural gas businesses are subject to a variety of other factors. These factors include weather; competition; developing new and maintaining existing energy contracts and associated load requirements with wholesale customers; customer energy conservation practices; the use of alternative energy sources by customers; government incentives to reduce overall energy usage; fuel, labor, and material prices in an environment of heightened inflation and material and labor supply chain disruptions; and the price elasticity of demand. Demand for electricity and natural gas in the Registrants' service territories is primarily driven by the pace of economic growth or decline that may be affected by changes in regional and global economic conditions, which may impact future earnings.
Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023.
As part of its ongoing effort to adapt to changing market conditions, Southern Company continues to evaluate and consider a wide array of potential business strategies. These strategies may include business combinations, partnerships, and acquisitions involving other utility or non-utility businesses or properties, disposition of, or the sale of interests in, certain assets or businesses, internal restructuring, or some combination thereof. Furthermore, Southern Company may engage in new business ventures that arise from competitive and regulatory changes in the utility industry. Pursuit of any of the above strategies, or any combination thereof, may significantly affect the business operations, risks, and financial condition of Southern Company. In addition, Southern Power and Southern Company Gas regularly consider and evaluate joint development arrangements as well as acquisitions and dispositions of businesses and assets as part of their business strategies. See Note 15 to the financial statements for additional information.
Environmental Matters
The Southern Company system's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, avian and other wildlife and habitat protection, and other natural resources. The Southern Company system maintains comprehensive environmental compliance and GHG strategies to assess both current and upcoming requirements and compliance costs associated with these environmental laws and regulations. New or revised environmental laws and regulations could further affect many areas of operations for the Subsidiary Registrants. The costs required to comply with environmental laws and regulations and to achieve stated goals, including capital expenditures, operations and maintenance costs, and costs reflected in ARO liabilities, may impact future electric generating unit retirement and replacement decisions (which are generally subject to approval from the traditional electric operating companies' respective state PSCs), results of operations, cash flows, and/or financial condition. Related costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, or changing fuel sources for certain existing
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units, as well as related upgrades to the Southern Company system's transmission and distribution (electric and natural gas) systems. A major portion of these costs is expected to be recovered through retail and wholesale rates, including existing ratemaking and billing provisions. The ultimate impact of environmental laws and regulations and the GHG goals discussed herein cannot be determined at this time and will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed technology, fuel prices, the outcome of pending and/or future legal challenges and regulatory matters, and the ability to continue recovering the related costs, through rates for the traditional electric operating companies and the natural gas distribution utilities and/or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.
Alabama Power and Mississippi Power recover environmental compliance costs through separate mechanisms, Rate CNP Compliance and the ECO Plan, respectively. Georgia Power's base rates include an ECCR tariff that allows for the recovery of environmental compliance costs. The natural gas distribution utilities of Southern Company Gas generally recover environmental remediation expenditures through rate mechanisms approved by their applicable state regulatory agencies. See Notes 2 and 3 to the financial statements for additional information.
Southern Power's PPAs generally contain provisions that permit charging the counterparty for some of the new costs incurred as a result of changes in environmental laws and regulations. Since Southern Power's units are generally newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and/or operating any type of existing or future facility. The impact of such laws, regulations, and other considerations on Southern Power and subsequent recovery through PPA provisions cannot be determined at this time.
Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity and natural gas, which could negatively affect results of operations, cash flows, and/or financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which may have the potential to affect their demand for electricity and natural gas.
Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, estimated capital expenditures through 2028 based on the current environmental compliance strategy for the Southern Company system and the traditional electric operating companies are as follows:
20242025202620272028Total
(in millions)
Southern Company$150 $141 $112 $92 $30 $525 
Alabama Power45 47 40 35 19 186 
Georgia Power92 80 60 32 10 274 
Mississippi Power13 13 12 26 65 
These estimates do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See "Environmental Laws and Regulations– Greenhouse Gases" and "– Water Quality" herein for additional information. The Southern Company system also anticipates substantial expenditures associated with ash pond closure and groundwater monitoring under the CCR Rule and related state rules, which are reflected in the applicable Registrants' ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein and Note 6 to the financial statements for additional information.
Environmental Laws and Regulations
Air Quality
Since 1990, the Southern Company system reduced SO2 and NOX air emissions by 99% and 92%, respectively, through 2022. Since 2005, the Southern Company system reduced mercury air emissions by 97% through 2022.
On February 13, 2023, the EPA published a final rule disapproving 19 state implementation plans (SIPs), including the States of Alabama and Mississippi, under the interstate transport (good neighbor) provisions of the Clean Air Act for the 2015 Ozone National Ambient Air Quality Standards (NAAQS). On March 14, 2023 and March 15, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the EPA's disapproval of the Mississippi SIP in the U.S. Court of Appeals for the
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Fifth Circuit. On June 8, 2023, the U.S. Court of Appeals for the Fifth Circuit stayed the EPA's disapproval of the Mississippi SIP, pending appeal. On April 13, 2023 and April 14, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the EPA's disapproval of the Alabama SIP in the U.S. Court of Appeals for the Eleventh Circuit. On August 17, 2023, the U.S. Court of Appeals for the Eleventh Circuit stayed the EPA's disapproval of the Alabama SIP, pending appeal.
On June 5, 2023, the EPA published the 2015 Ozone NAAQS Good Neighbor federal implementation plan (FIP), which requires reductions in NOX emissions from sources in 23 states, including Alabama and Mississippi, to assure those states satisfy their Clean Air Act good neighbor obligations for the 2015 Ozone NAAQS. Georgia and North Carolina have approved interstate transport SIPs addressing the 2015 Ozone NAAQS and are not subject to this rule. On June 16, 2023 and June 27, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the FIP for Mississippi in the U.S. Court of Appeals for the Fifth Circuit. On August 4, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the FIP for Alabama in the U.S. Court of Appeals for the Eleventh Circuit. Both cases are being held in abeyance pending resolution of the Mississippi SIP disapproval and Alabama SIP disapproval cases, respectively.
In July and September 2023, the EPA published an Interim Final Rule and an updated Interim Final Rule that stays the implementation of the FIPs for states with judicially stayed SIP disapprovals, including Mississippi and Alabama, respectively. The Interim Final Rule revises the existing regulations to maintain currently applicable trading programs for those states.
The ultimate impact of the rule and associated legal matters cannot be determined at this time; however, implementation of the FIPs will likely result in increased compliance costs for the traditional electric operating companies.
Water Quality
In 2020, the EPA published the final steam electric ELG reconsideration rule (ELG Reconsideration Rule), a reconsideration of the 2015 ELG rule's limits on bottom ash transport water and flue gas desulfurization wastewater that extended the latest applicability date for both discharges to December 31, 2025. The ELG Reconsideration Rule also updated the voluntary incentive program and provided new subcategories for low utilization electric generating units and electric generating units that will permanently cease coal combustion by 2028. On March 29, 2023, the EPA published a proposed ELG Supplemental Rule revising certain effluent limits of the 2020 and 2015 ELG rules. The proposal imposes more stringent requirements for flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate to be met no later than December 31, 2029. The EPA is also proposing that a limited number of facilities already achieving compliance with the 2020 ELG Reconsideration Rule be allowed to elect retirement or repowering by December 31, 2032 as opposed to meeting the new more stringent requirements. The proposal maintains the 2020 ELG Reconsideration Rule's permanent cessation of coal combustion subcategory allowing units to continue to operate until the end of 2028 without having to install additional technologies. The proposal also maintains the Voluntary Incentive Program (VIP) subcategory, which allows units to comply with VIP limits by December 31, 2028. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
As required by the ELG Reconsideration Rule, in 2021, Alabama Power and Georgia Power each submitted initial notices of planned participation (NOPP) for applicable units seeking to qualify for these cessation of coal combustion or VIP subcategories that require compliance by December 31, 2028.
Alabama Power submitted its NOPP to the Alabama Department of Environmental Management (ADEM) indicating plans to retire Plant Barry Unit 5 (700 MWs) and to cease using coal and begin operating solely on natural gas at Plant Barry Unit 4 (350 MWs) and Plant Gaston Unit 5 (880 MWs). Alabama Power, as agent for SEGCO, indicated plans to retire Plant Gaston Units 1 through 4 (1,000 MWs). However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. The NOPP submittals are subject to the review of the ADEM. Plant Barry Unit 4 ceased using coal and began to operate solely on natural gas in December 2022. See Notes 2 and 7 to the financial statements under "Georgia Power – Integrated Resource Plans" and "SEGCO," respectively, for additional information.
The remaining assets for which Alabama Power has indicated retirement, due to early closure or repowering of the unit to natural gas, have net book values totaling approximately $1.2 billion (excluding capitalized asset retirement costs which are recovered through Rate CNP Compliance) at December 31, 2023. Based on an Alabama PSC order, Alabama Power is authorized to establish a regulatory asset to record the unrecovered investment costs, including the plant asset balance and the site removal and closure costs, associated with unit retirements caused by environmental regulations (Environmental Accounting Order). Under the Environmental Accounting Order, the regulatory asset would be amortized and recovered over an affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance. See Note 2 to the financial statements under "Alabama Power – Rate CNP Compliance" and " – Environmental Accounting Order" for additional information.
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Georgia Power submitted its NOPP to the Georgia Environmental Protection Division (EPD) indicating plans to retire Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership), which occurred in August 2022, Plant Bowen Units 1 and 2 (1,400 MWs), and Plant Scherer Unit 3 (614 MWs based on 75% ownership) on or before the compliance date of December 31, 2028. Georgia Power also submitted a NOPP indicating plans to pursue compliance with the ELG Reconsideration Rule for Plant Scherer Units 1 and 2 (137 MWs based on 8.4% ownership) through the voluntary incentive program by no later than December 31, 2028. Georgia Power intends to comply with the ELG Rules for Plant Bowen Units 3 and 4 through the generally applicable requirements by December 31, 2025; therefore, no NOPP submission was required for these units. The NOPP submittals and generally applicable requirements are subject to the review of the Georgia EPD and decisions related to retirement or continued operation of units are subject to Georgia PSC approval. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the management and disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (ash ponds) at active electric generating power plants. The CCR Rule requires landfills and ash ponds to be evaluated against a set of performance criteria and potentially closed if certain criteria are not met. Closure of existing landfills and ash ponds requires installation of equipment and infrastructure to manage CCR in accordance with the CCR Rule. In addition to the federal CCR Rule, the States of Alabama and Georgia finalized state regulations regarding the management and disposal of CCR within their respective states. In 2019, the State of Georgia received partial approval from the EPA for its state CCR permitting program, which has broader applicability than the federal rule. The State of Mississippi has not developed a state CCR permit program.
On August 14, 2023, the EPA published a proposal to deny the ADEM's CCR permit program application. Alabama Power's permits to close its CCR facilities remain valid under state law. In the absence of an EPA-approved state permit program, CCR facilities in Alabama will remain subject to both the federal and state CCR rules.
The Holistic Approach to Closure: Part A rule, finalized in 2020, revised the deadline to stop sending CCR and non-CCR wastes to unlined surface impoundments to April 11, 2021 and established a process for the EPA to approve extensions to the deadline. The traditional electric operating companies stopped sending CCR and non-CCR wastes to their unlined impoundments prior to April 11, 2021 and, therefore, did not submit requests for extensions. Beginning in January 2022, the EPA issued numerous Part A determinations that state its current positions on a variety of CCR Rule compliance requirements, such as criteria for groundwater corrective action and CCR unit closure. The traditional electric operating companies are working with state regulatory agencies to determine whether the EPA's current positions may impact closure and groundwater monitoring plans.
In April 2022, the Utilities Solid Waste Activities Group and a group of generating facility operators filed petitions for review in the U.S. Court of Appeals for the D.C. Circuit challenging whether the EPA's January 2022 actions establish new legislative rules that should have gone through notice-and-comment rulemaking. A decision by the court is expected in 2024. The ultimate impacts of the EPA's current positions are subject to the outcome of the pending litigation and any potential future rulemaking and cannot be determined at this time.
On May 18, 2023, the EPA published a proposed rule to establish two new categories of federally regulated CCR, legacy surface impoundments and CCR management units (CCRMUs). The proposal establishes accelerated compliance deadlines for legacy surface impoundments to meet regulatory requirements, including a requirement to initiate closure within 12 months after the effective date of the final rule. The EPA is also proposing a definition for CCRMUs. The EPA's proposal would also require facility evaluations to be completed at both active facilities and inactive facilities with one or more legacy surface impoundment to determine the presence or absence of CCRMUs. CCRMUs must comply with the CCR Rule's provisions for groundwater monitoring, corrective action, closure, and post-closure activities. On November 14, 2023, the EPA published a Notice of Data Availability supplementing the proposed rule, which sought comment on new data and a supplemental risk assessment that could be used to support final rulemaking. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
Based on requirements for closure and monitoring of landfills and ash ponds pursuant to the CCR Rule and applicable state rules, the traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to closure methodologies, schedules, and/or costs becomes available. Some of these updates have been, and future updates may be, material. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and the traditional electric operating companies could be materially impacted. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements," Notes 2 and 3 to the financial statements under "Georgia Power – Rate Plans" and "General Litigation Matters – Alabama Power," respectively, and Note 6 to the financial statements for additional information.
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Greenhouse Gases
On May 23, 2023, the EPA published proposed GHG standards and state plan guidelines for fossil fuel-fired power plants, which would require GHG limits for subcategories of both new and existing units based on technologies such as carbon capture and sequestration, low-GHG hydrogen co-firing, and natural gas co-firing. The proposed standards for new combustion turbines include subcategories for different operational uses including peaking, intermediate, and base load. Compliance with new source standards, once finalized, begins when the unit comes online. The proposed state plan guidelines for existing units include subcategories based on unit type, retirement date, size, and capacity factor. The EPA is proposing a 24-month state plan submission deadline for the existing unit implementation and may allow states to implement some limited form of trading and averaging for the state plans. Existing source compliance is proposed to begin as early as January 1, 2030, depending on the unit type and subcategory. The EPA also proposes to simultaneously repeal the Affordable Clean Energy rule. On November 17, 2023, the EPA published a final rule updating the regulations governing the processes and timelines for state and federal plans to implement existing source GHG performance standards. While this rule establishes the general requirements and timelines for states to follow in implementing the EPA's emissions guidelines, the pending final rule for GHG emissions from fossil fuel-fired power plants is expected to include schedules and other implementation requirements that will supersede these general provisions. On November 20, 2023, the EPA published a Supplemental Notice of Proposed Rulemaking for the pending rules for fossil fuel-fired power plants requesting additional input on how the EPA should address reliability concerns in the final rules. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
In 2021, the United States officially rejoined the Paris Agreement. The Paris Agreement establishes a non-binding universal framework for addressing GHG emissions based on nationally determined emissions reduction contributions and sets in place a process for tracking progress towards the goals every five years. In 2021, President Biden announced a new target for the United States to achieve a 50% to 52% reduction in economy-wide GHG emissions from 2005 levels by 2030. The target was accepted by the United Nations as the United States' nationally determined emissions reduction contribution under the Paris Agreement.
Additional GHG policies, including legislation, may emerge in the future requiring the United States to accelerate its transition to a lower GHG emitting economy; however, associated impacts are currently unknown. The Southern Company system has transitioned from an electric generating mix of 70% coal and 15% natural gas in 2007 to a mix of 17% coal and 54% natural gas in 2023. This transition has been supported in part by the Southern Company system retiring over 6,700 MWs of coal-fired generating capacity since 2010 and converting 3,700 MWs of generating capacity from coal to natural gas since 2015. In addition, the Southern Company system's capacity mix consists of over 11,600 MWs of renewable and storage facilities through ownership and long-term PPAs. See "Environmental Laws and Regulations – Water Quality" hereinfor information on plans to retire or convert to natural gas additional coal-fired generating capacity. In addition, Southern Company Gas has replaced over 6,000 miles of pipe material that was more prone to fugitive emissions (unprotected steel and cast-iron pipe), resulting in mitigation of more than 3.3 million metric tons of CO2 equivalents from its natural gas distribution system since 1998.
The following table provides the Registrants' 2022 and preliminary 2023 Scope 1 GHG emissions based on equity share of facilities:
2022Preliminary 2023
(in million metric tons of CO2 equivalent)
Southern Company(*)
8580
Alabama Power(*)
3528
Georgia Power2324
Mississippi Power99
Southern Power1313
Southern Company Gas(*)
22
(*)Includes GHG emissions attributable to disposed assets through the date of the applicable disposition and to acquired assets beginning with the date of the applicable acquisition. See Note 15 to the financial statements for additional information.
Southern Company system management has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Based on the preliminary 2023 emissions, the Southern Company system has achieved an estimated GHG emission reduction of 49% since 2007. GHG emissions decreased in 2023 when compared to 2022 as coal generation was displaced by lower carbon generation, including from Plant Vogtle Unit 3, as discussed further under RESULTS OF OPERATIONS – "Southern Company – Electricity Business" herein. Southern Company system management expects to achieve GHG reductions of greater than 50% as early as 2025, five years earlier than the established interim goal, and remain close to 50% through the late 2020s, followed thereafter by continued reductions. While none
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of Southern Company's subsidiaries are currently subject to renewable portfolio standards or similar requirements, management of the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. Southern Company system management plans to continue to pursue a diverse portfolio including low-carbon and carbon-free resources and energy efficiency resources; continue to transition the Southern Company system's generating fleet and make the necessary related investments in transmission and distribution systems; implement initiatives to reduce natural gas distribution operational emissions; continue its research and development with a particular focus on technologies that lower GHG emissions, including methods of removing carbon from the atmosphere; and constructively engage with policymakers, regulators, investors, customers, and other stakeholders to support outcomes leading to a net zero future.
Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and Southern Company Gas conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in their financial statements. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia (which represent substantially all of Southern Company Gas' accrued remediation costs) have all received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies. The traditional electric operating companies and Southern Company Gas may be liable for some or all required cleanup costs for additional sites that may require environmental remediation. See Note 3 to the financial statements under "Environmental Remediation" for additional information.
Regulatory Matters
See OVERVIEW – "Recent Developments" herein and Note 2 to the financial statements for a discussion of regulatory matters related to Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas, including items that could impact the applicable Registrants' future earnings, cash flows, and/or financial condition.
Alabama Power
On July 14, 2023, Alabama Power issued a request for proposals of between 100 MWs and 1,200 MWs of capacity beginning no later than December 1, 2028, with consideration for commencement as early as 2025. Any purchases will depend upon the cost competitiveness of the respective offers, as well as other options available to Alabama Power, and would ultimately require approval by the Alabama PSC. The ultimate outcome of this matter cannot be determined at this time.
Construction Programs
The Subsidiary Registrants are engaged in continuous construction programs to accommodate existing and estimated future loads on their respective systems. The Southern Company system strategy continues to include developing and constructing new electric generating facilities, expanding and improving the electric transmission and electric and natural gas distribution systems, and undertaking projects to comply with environmental laws and regulations.
For the traditional electric operating companies, major generation construction projects are subject to state PSC approval in order to be included in retail rates. The largest construction project currently underway in the Southern Company system is Plant Vogtle Unit 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information. Also see Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for information regarding Georgia Power's request with the Georgia PSC to develop, own, and operate three simple cycle combustion turbines at Plant Yates.
See Note 15 to the financial statements under "Southern Power" for information relating to Southern Power's construction of renewable energy facilities.
Southern Company Gas is engaged in various infrastructure improvement programs designed to update or expand the natural gas distribution systems of the natural gas distribution utilities to improve reliability and resiliency, reduce emissions, and meet operational flexibility and growth. The natural gas distribution utilities recover their investment and a return associated with these infrastructure programs through their regulated rates. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information on Southern Company Gas' construction program.
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See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein for additional information regarding the Registrants' capital requirements for their construction programs, including estimated totals for each of the next five years.
Southern Power's Power Sales Agreements
General
Southern Power has PPAs with some of the traditional electric operating companies, other investor-owned utilities, IPPs, municipalities, and other load-serving entities, as well as commercial and industrial customers. The PPAs are expected to provide Southern Power with a stable source of revenue during their respective terms.
Many of Southern Power's PPAs have provisions that require Southern Power or the counterparty to post collateral or an acceptable substitute guarantee if (i) S&P or Moody's downgrades the credit ratings of the respective company to an unacceptable credit rating, (ii) the counterparty is not rated, or (iii) the counterparty fails to maintain a minimum coverage ratio. See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein for additional information.
Southern Power works to maintain and expand its share of the wholesale market. During 2023, Southern Power continued to be successful in remarketing up to 438 MWs of annual natural gas generation capacity to load-serving entities through several PPAs extending over the next 16 years. Market demand is being driven by load-serving entities replacing expired purchase contracts and/or retired generation, as well as planning for future growth.
Natural Gas
Southern Power's electricity sales from natural gas facilities are primarily through long-term PPAs that consist of two types of agreements. The first type, referred to as a unit or block sale, is a customer purchase from a dedicated generating unit where all or a portion of the generation from that unit is reserved for that customer. Southern Power typically has the ability to serve the unit or block sale customer from an alternate resource. The second type, referred to as requirements service, provides that Southern Power serve the customer's capacity and energy requirements from a combination of the customer's own generating units and from Southern Power resources not dedicated to serve unit or block sales. Southern Power has rights to purchase power provided by the requirements customers' resources when economically viable.
As a general matter, substantially all of the PPAs provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel or purchased power relating to the energy delivered under such PPAs. To the extent a particular generating facility does not meet the operational requirements contemplated in the PPAs, Southern Power may be responsible for excess fuel costs. With respect to fuel transportation risk, most of Southern Power's PPAs provide that the counterparties are responsible for the availability of fuel transportation to the particular generating facility.
Capacity charges that form part of the PPA payments are designed to recover fixed and variable operation and maintenance costs based on dollars-per-kilowatt year. In general, to reduce Southern Power's exposure to certain operation and maintenance costs, Southern Power has LTSAs. See Note 1 to the financial statements under "Long-Term Service Agreements" for additional information.
Solar and Wind
Southern Power's electricity sales from solar and wind generating facilities are also primarily through long-term PPAs; however, these PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or provide Southern Power a certain fixed price for the electricity sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Generally, under the renewable generation PPAs, the purchasing party retains the right to keep or resell the associated renewable energy credits.
Income Tax Matters
Consolidated Income Taxes
The impact of certain tax events at Southern Company and/or its other subsidiaries can, and does, affect each Registrant's ability to utilize certain tax credits. See "Tax Credits" and ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Accounting for Income Taxes" herein and Note 10 to the financial statements for additional information.
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Tax Credits
Southern Company has received ITCs and PTCs in connection with investments in solar, wind, fuel cell, advanced nuclear, and battery energy storage facilities (co-located with existing solar facilities) primarily at Southern Power and Georgia Power.
Southern Power's ITCs relate to its investment in new solar facilities and battery energy storage facilities (co-located with existing solar facilities) that are acquired or constructed and its PTCs relate to the first 10 years of energy production from its wind facilities, which have had, and may continue to have, a material impact on Southern Power's cash flows and net income. At December 31, 2023, Southern Company and Southern Power had approximately $0.8 billion and $0.5 billion, respectively, of unutilized federal ITCs and PTCs, which are currently expected to be fully utilized by 2029, but could be further delayed. Since 2018, Southern Power has been utilizing tax equity partnerships for wind, solar, and battery energy storage projects, where the tax equity partner takes significantly all of the respective federal tax benefits. These tax equity partnerships are consolidated in Southern Company's and Southern Power's financial statements using the HLBV methodology to allocate partnership gains and losses.
In the third quarter 2023, Georgia Power started generating advanced nuclear PTCs for Plant Vogtle Unit 3 beginning on the in-service date of July 31, 2023. PTCs are recognized as an income tax benefit based on KWH production. In addition, pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 from the other Vogtle Owners. The gain recognized on the purchase of the joint owner PTCs is recognized as an income tax benefit. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information regarding Plant Vogtle Units 3 and 4.
See Note 1 to the financial statements under "General" for additional information on the HLBV methodology and Note 1 to the financial statements under "Income Taxes" and Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and "Effective Tax Rate" for additional information regarding utilization and amortization of credits and the tax benefit related to associated basis differences.
Inflation Reduction Act
In August 2022, the IRA was signed into law. The IRA extends, expands, and increases ITCs and PTCs for clean energy projects, allows PTCs for solar projects, adds ITCs for stand-alone energy storage projects with an option to elect out of the tax normalization requirement, and allows for the transferability of the tax credits. The IRA extends and increases the tax credits for carbon capture and sequestration projects and adds tax credits for clean hydrogen and nuclear projects. Additional ITC and PTC amounts are available if the projects meet domestic content requirements or are located in low-income or energy communities. The IRA also enacted a 15% corporate minimum tax on book income, with material adjustments for pension costs and tax depreciation. The 15% corporate minimum tax on book income can be reduced by energy tax credits.
For solar projects placed in service in 2022 through 2032, the IRA provides for a 30% ITC and an option to claim a PTC instead of an ITC. Starting in 2023 and through 2032, the IRA provides for a 30% ITC for stand-alone energy storage projects. For wind projects placed in service in 2022 through 2032, the IRA provides for a 100% PTC, adjusted for inflation annually. For projects placed in service before 2022, the 2023 PTC rate is 2.8 cents per KWH. For projects placed in service in 2022 and later, the 2023 PTC rate is 2.75 cents per KWH. The same PTC rate applies for solar projects for which the PTC option has been elected. To realize the full value of ITCs and PTCs, the IRA requires satisfaction of prevailing wage and apprenticeship requirements.
In June 2023, the IRS issued temporary regulations related to the transferability of tax credits. During the fourth quarter 2023, Southern Power executed an agreement to transfer certain PTCs generated in 2023. The discount recognized was booked through income tax expense and was immaterial. Southern Company and certain subsidiaries are considering the sale of additional tax credits that are eligible to be transferred.
Implementation of the IRA provisions is subject to the issuance of additional guidance by the U.S. Treasury Department and the IRS. The Registrants are still evaluating the impacts and the ultimate outcome of this matter cannot be determined at this time.
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Natural Gas Safe Harbor Method
In April 2023, the IRS issued Revenue Procedure 2023-15, which provides a safe harbor tax method of accounting that taxpayers may use to determine whether certain expenditures to maintain, repair, replace, or improve natural gas transmission and distribution property must be capitalized or allowed as repair deductions. The revenue procedure allows multiple alternatives for implementation which will result in a tax accounting method change for Southern Company Gas' eligible expenditures. Due to the complexity of analysis needed and the various implementation options allowed under the revenue procedure, Southern Company and Southern Company Gas are still evaluating the impacts and the ultimate outcome of this matter cannot be determined at this time. See Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" for additional information.
General Litigation and Other Matters
The Registrants are involved in various matters being litigated and/or regulatory and other matters that could affect future earnings, cash flows, and/or financial condition. The ultimate outcome of such pending or potential litigation against each Registrant and any subsidiaries or regulatory and other matters cannot be determined at this time; however, for current proceedings and/or matters not specifically reported herein or in Notes 2 and 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings and/or matters would have a material effect on such Registrant's financial statements. See Notes 2 and 3 to the financial statements for a discussion of various contingencies, including matters being litigated, regulatory matters, and other matters which may affect future earnings potential.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Registrants prepare their financial statements in accordance with GAAP, which requires the use of estimates, judgments, and assumptions. Significant accounting policies are described in the notes to the financial statements. Detailed further herein are certain estimates made in the application of these policies that may have a material impact on the results of operations, financial condition, and related disclosures of the applicable Registrants (as indicated in the section descriptions herein). Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed these critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Utility Regulation (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
The traditional electric operating companies and the natural gas distribution utilities are subject to retail regulation by their respective state PSCs or other applicable state regulatory agencies and wholesale regulation by the FERC. These regulatory agencies set the rates the traditional electric operating companies and the natural gas distribution utilities are permitted to charge customers based on allowable costs, including a reasonable ROE. As a result, the traditional electric operating companies and the natural gas distribution utilities apply accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards for rate regulated entities also impacts their financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the traditional electric operating companies and the natural gas distribution utilities; therefore, the accounting estimates inherent in specific costs such as depreciation, AROs, and pension and other postretirement benefits have less of a direct impact on the results of operations and financial condition of the applicable Registrants than they would on a non-regulated company. Additionally, a regulatory agency may disallow recovery of all or a portion of certain assets. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for information regarding the disallowance of certain capital investments at Nicor Gas and "Estimated Cost, Schedule, and Rate Recovery for the Construction of Plant Vogtle Units 3 and 4" herein for information regarding the Prudency Stipulation related to Georgia Power's construction of Plant Vogtle Units 3 and 4.
Revenues related to regulated utility operations as a percentage of total operating revenues in 2023 for the applicable Registrants were as follows: 89% for Southern Company, 98% for Alabama Power, 96% for Georgia Power, 99% for Mississippi Power, and 87% for Southern Company Gas.
As reflected in Note 2 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact
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the amounts of such regulatory assets and liabilities and could adversely impact the financial statements of the applicable Registrants.
Estimated Cost, Schedule, and Rate Recovery for the Construction of Plant Vogtle Units 3 and 4
(Southern Company and Georgia Power)
In 2016, the Georgia PSC approved a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with Georgia Power's fifteenth VCM report. In January 2018, the Georgia PSC issued an order approving Georgia Power's seventeenth VCM report, which included a modification of the Vogtle Cost Settlement Agreement. The January 2018 order and the modified Vogtle Cost Settlement Agreement resolved certain regulatory matters related to Plant Vogtle Units 3 and 4 including, but not limited to: (i) Georgia Power's total project capital cost forecast of $7.3 billion (net of $1.7 billion received under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds) was found reasonable and (ii) a prudence proceeding on cost recovery would occur subsequent to achieving fuel load for Unit 4. On December 19, 2023, the Georgia PSC voted to approve Georgia Power's Application as modified by the Prudency Stipulation. Under the terms of the approved Prudency Stipulation, Georgia Power will recover $7.562 billion in total construction and capital costs and associated retail rate base items of $1.02 billion, which includes AFUDC financing costs above $4.418 billion (the Georgia PSC-certified amount) up to $7.562 billion. The approval of the Application and the Prudency Stipulation resolves all issues for determination by the Georgia PSC regarding the reasonableness, prudence, and cost recovery for the remaining Plant Vogtle Units 3 and 4 construction and capital costs not already in retail base rates.
As of December 31, 2023, Georgia Power revised its total project capital cost forecast to $10.8 billion (net of $1.7 billion received under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds). This forecast includes construction contingency of $36 million and is based on the actual in-service date of July 2023 for Unit 3 and a projected in-service date during the second quarter 2024 for Unit 4. Since 2018, established construction contingency and additional costs totaling $2.7 billion have been assigned to the base capital cost forecast. Georgia Power did not seek rate recovery for the $0.7 billion increase to the base capital cost forecast included in the nineteenth VCM report and charged to income by Georgia Power in the second quarter 2018 and, until the prudency proceeding described above, did not seek rate recovery for subsequent construction and additional contingency costs assigned to the base capital cost forecast. After considering the significant level of uncertainty that existed regarding the future recoverability of these costs since the ultimate outcome of these matters was subject to the outcome of assessments by management, as well as Georgia PSC decisions in the related regulatory proceedings, Georgia Power recorded total pre-tax charges to income of $1.1 billion ($0.8 billion after tax) in 2018; $149 million ($111 million after tax) and $176 million ($131 million after tax) in the second quarter and the fourth quarter 2020, respectively; $48 million ($36 million after tax), $460 million ($343 million after tax), $264 million ($197 million after tax), and $480 million ($358 million after tax) in the first quarter 2021, the second quarter 2021, the third quarter 2021, and the fourth quarter 2021, respectively; and $36 million ($27 million after tax), $32 million ($24 million after tax), and $148 million ($110 million after tax) in the second quarter 2022, the third quarter 2022, and the fourth quarter 2022, respectively. As a result of the Georgia PSC's approval of the Prudency Stipulation, Georgia Power recorded a pre-tax credit to income of approximately $228 million ($170 million after tax) in the fourth quarter 2023 to recognize CWIP costs previously charged to income, which are now recoverable through retail rates. Associated AFUDC on these costs was also recognized.
In September 2022, Georgia Power and MEAG Power reached an agreement to resolve a dispute regarding the cost-sharing and tender provisions of the Global Amendments (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"). Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project capital cost forecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the current project capital cost forecast, with no further adjustment for force majeure costs.
On October 5, 2023 and October 17, 2023, Georgia Power reached agreements with OPC and Dalton, respectively, to resolve its respective dispute with each of OPC and Dalton regarding the cost-sharing and tender provisions of the Global Amendments. Under the terms of the agreements with OPC and Dalton, among other items, (i) each of OPC and Dalton retracted its exercise of the tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4, (ii) Georgia Power made payments immediately after execution of the agreements of $308 million and $17 million to OPC and Dalton, respectively, representing payment for a portion of each of OPC's and Dalton's costs of construction for Plant Vogtle Units 3 and 4 previously incurred, (iii) Georgia Power will pay a portion of each of OPC's and Dalton's further costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will be in an aggregate amount of approximately $105 million and $6 million for OPC and Dalton, respectively, based on the current project capital cost forecast,
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and (iv) Georgia Power will pay 66% of each of OPC's and Dalton's costs of construction with respect to any amounts above the current project capital cost forecast, with no further adjustment for force majeure costs.
Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing provisions of the Global Amendments, including the settlement with MEAG Power. Based on the current project capital cost forecast and the settlements with OPC and Dalton described above, Georgia Power recorded a pre-tax charge to income of approximately $160 million ($120 million after tax) in the third quarter 2023. These charges are included in the total project capital cost forecast and will not be recovered from retail customers.
As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts for Unit 4 on a regular basis to incorporate current information available, particularly in the areas of start-up testing and related test results and engineering support.
The projected schedule for Unit 4 significantly depends on the progression of start-up and pre-operational testing, which may be impacted by equipment or other operational failures. Any further delays could result in a later in-service date and cost increases.
Various design and other licensing-based compliance matters may result in additional license amendment requests or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the Unit 4 project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time. However, any extension of the in-service date beyond June 2024 for Unit 4, including the current level of cost sharing described in Note 2, is estimated to result in additional base capital costs for Georgia Power of up to $25 million per month as well as any additional related construction, support resources, or testing costs. Pursuant to the Prudency Stipulation, any further changes to the capital cost forecast will not be recoverable through regulated rates and will be required to be charged to income, and such charges could be material.
Given the significant complexity involved in estimating the future costs to complete construction and start-up of Plant Vogtle Unit 4, as well as the potential impact on results of operations and cash flows, Southern Company and Georgia Power consider these items to be critical accounting estimates. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Accounting for Income Taxes (Southern Company, Georgia Power, Mississippi Power, Southern Power, and Southern Company Gas)
The consolidated income tax provision and deferred income tax assets and liabilities, as well as any unrecognized tax benefits and valuation allowances, require significant judgment and estimates. These estimates are supported by historical tax return data, reasonable projections of taxable income, the ability and intent to implement tax planning strategies if necessary, and interpretations of applicable tax laws and regulations across multiple taxing jurisdictions. The effective tax rate reflects the statutory tax rates and calculated apportionments for the various states in which the Southern Company system operates.
Southern Company files a consolidated federal income tax return and the Registrants file various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and each subsidiary is allocated an amount of tax similar to that which would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability. Certain deductions and credits can be limited or utilized at the consolidated or combined level resulting in tax credit and/or state NOL carryforwards that would not otherwise result on a stand-alone basis. Utilization of these carryforwards and the assessment of valuation allowances are based on significant judgment and extensive analysis of Southern Company's and its subsidiaries' current financial position and results of operations, including currently available information about future years, to estimate when future taxable income will be realized. See Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and " – Net Operating Loss Carryforwards" for additional information.
Current and deferred state income tax liabilities and assets are estimated based on laws of multiple states that determine the income to be apportioned to their jurisdictions. States have various filing methodologies and utilize specific formulas to calculate the apportionment of taxable income. The calculation of deferred state taxes considers apportionment factors and filing methodologies that are expected to apply in future years. Any apportionments and/or filing methodologies ultimately finalized in a manner inconsistent with expectations could have a material effect on the financial statements of the applicable Registrants.
Asset Retirement Obligations (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
Estimating AROs requires significant judgment. AROs are computed as the present value of the estimated costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the
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related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities.
The ARO liabilities for the traditional electric operating companies primarily relate to facilities that are subject to the CCR Rule and the related state rules, principally ash ponds. In addition, Alabama Power and Georgia Power have retirement obligations related to the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 through 3). Other significant AROs include various landfill sites and asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power.
The traditional electric operating companies and Southern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company system's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for certain retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these retirement obligations will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.
The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule and the related state rules. The traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to these assumptions becomes available. Some of these updates have been, and future updates may be, material. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. See Note 6 to the financial statements and FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein for additional information, including updates to AROs related to ash ponds recorded during 2023 by certain Registrants.
Pension and Other Postretirement Benefits (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
The applicable Registrants' calculations of pension and other postretirement benefits expense are dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term rate of return (LRR) on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the applicable Registrants believe the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect their pension and other postretirement benefit costs and obligations.
Key elements in determining the applicable Registrants' pension and other postretirement benefit expense are the LRR and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. For purposes of determining the applicable Registrants' liabilities related to the pension and other postretirement benefit plans, Southern Company discounts the future related cash flows using a single-point discount rate for each plan developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. The discount rate assumption impacts both the service cost and non-service costs components of net periodic benefit costs as well as the projected benefit obligations.
The LRR on pension and other postretirement benefit plan assets is based on Southern Company's investment strategy, as described in Note 11 to the financial statements, historical experience, and expectations that consider external actuarial advice, and represents the average rate of earnings expected over the long term on the assets invested to provide for anticipated future benefit payments. Southern Company determines the amount of the expected return on plan assets component of non-service costs by applying the LRR of various asset classes to Southern Company's target asset allocation. The LRR only impacts the non-service costs component of net periodic benefit costs for the following year and is set annually at the beginning of the year.
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The following table illustrates the sensitivity to changes in the applicable Registrants' long-term assumptions with respect to the discount rate, salary increases, and the long-term rate of return on plan assets:
Increase/(Decrease) in
25 Basis Point Change in:Total Benefit Expense for 2024Projected Obligation for Pension Plan at December 31, 2023
Projected Obligation for
Other Postretirement
Benefit Plans at December 31, 2023
(in millions)
Discount rate:
Southern Company$35/$(32)$419/$(397)$34/$(32)
Alabama Power$9/$(9)$101/$(96)$9/$(8)
Georgia Power$9/$(9)$122/$(116)$11/$(11)
Mississippi Power$2/$(1)$18/$(18)$1/$(1)
Southern Company Gas$2/$(2)$27/$(25)$4/$(4)
Salaries:
Southern Company$18/$(17)$87/$(84)$–/$–
Alabama Power$5/(5)$24/$(23)$–/$–
Georgia Power$5/(5)$23/$(23)$–/$–
Mississippi Power$1/$(1)$4/$(4)$–/$–
Southern Company Gas$1/$(1)$3/$(3)$–/$–
Long-term return on plan assets:
Southern Company$41/$(41)N/AN/A
Alabama Power$10/$(10)N/AN/A
Georgia Power$13/$(13)N/AN/A
Mississippi Power$2/$(2)N/AN/A
Southern Company Gas$3/$(3)N/AN/A
See Note 11 to the financial statements for additional information regarding pension and other postretirement benefits.
Impairment (Southern Company, Southern Power, and Southern Company Gas)
Goodwill (Southern Company and Southern Company Gas)
The acquisition method of accounting for business combinations requires the assets acquired and liabilities assumed to be recorded at the date of acquisition at their respective estimated fair values. The applicable Registrants have recognized goodwill as of the date of their acquisitions, as a residual over the fair values of the identifiable net assets acquired. Goodwill is recorded at the reporting unit level, which is the operating segment or a business one level below the operating segment (a component), if discrete financial information is prepared and regularly reviewed by management. Components are aggregated if they have similar economic characteristics. Goodwill is tested for impairment at the reporting unit level on an annual basis in the fourth quarter of the year and on an interim basis if events and circumstances occur that indicate goodwill may be impaired.
Goodwill is evaluated for impairment either under the qualitative assessment option or the quantitative option to determine the fair value of the reporting unit. If goodwill is determined to be impaired, an impairment loss measured at the amount by which the reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill, is recorded.
Goodwill for Southern Company and Southern Company Gas was $5.2 billion and $5.0 billion, respectively, at December 31, 2023. During 2022, Southern Company recorded a $119 million impairment loss as a result of its annual goodwill impairment test for PowerSecure.
The judgments made in determining the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can significantly impact the applicable Registrant's results of operations. Fair values and useful lives are determined based on, among other factors, the expected future period of benefit of the asset, the various characteristics of the asset, and projected cash flows. As the determination of an asset's fair value and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the applicable Registrants consider these estimates to be critical accounting estimates.
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See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information regarding the applicable Registrants' goodwill.
Long-Lived Assets (Southern Company, Southern Power, and Southern Company Gas)
The applicable Registrants assess their other long-lived assets for impairment whenever events or changes in circumstances indicate that an asset's carrying amount may not be recoverable. If an impairment indicator exists, the asset is tested for recoverability by comparing the asset carrying amount to the sum of the undiscounted expected future cash flows directly attributable to the asset's use and eventual disposition. If the estimate of undiscounted future cash flows is less than the carrying amount of the asset, the fair value of the asset is determined and a loss is recorded equal to the difference between the carrying amount and the fair value of the asset. In addition, when assets are identified as held for sale, an impairment loss is recognized to the extent the carrying amount of the assets or asset group exceeds their fair value less cost to sell. A high degree of judgment is required in developing estimates related to these evaluations, which are based on projections of various factors, some of which have been quite volatile in recent years.
Southern Power's investments in long-lived assets are primarily generation assets. Excluding the natural gas distribution utilities, Southern Company Gas' investments in long-lived assets are primarily natural gas transportation assets.
For Southern Power, examples of impairment indicators could include, but are not limited to, significant changes in construction schedules, current period losses combined with a history of losses or a projection of continuing losses, a significant decrease in market prices, changes in tax legislation, the inability to remarket generating capacity for an extended period, the unplanned termination of a customer contract, or the inability of a customer to perform under the terms of the contract. For Southern Company Gas, examples of impairment indicators could include, but are not limited to, significant changes in the U.S. natural gas storage market, construction schedules, current period losses combined with a history of losses or a projection of continuing losses, a significant decrease in market prices, the inability to renew or extend customer contracts or the inability of a customer to perform under the terms of the contract, attrition rates, or the inability to deploy a development project.
As the determination of the expected future cash flows generated from an asset, an asset's fair value, and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the applicable Registrants consider these estimates to be critical accounting estimates.
During 2021, Southern Company recorded impairment charges totaling $7 million ($6 million after tax) related to its leveraged lease investments. During 2022, Southern Company Gas recorded pre-tax impairment charges totaling $131 million ($99 million after tax) related to natural gas storage facilities. During 2021, Southern Company Gas recorded total pre-tax impairment charges of $84 million ($67 million after tax) related to its equity method investment in the PennEast Pipeline project. See Notes 7 and 9 to the financial statements under "Southern Company Gas" and "Southern Company Leveraged Lease," respectively, and Note 15 to the financial statements for additional information on recent asset impairments.
Revenue Recognition (Southern Power)
Southern Power's power sale transactions, which include PPAs, are classified in one of four general categories: leases, normal sale derivatives or contracts with customers, derivatives designated as cash flow hedges, and derivatives not designated as hedges. Southern Power's revenues are dependent upon significant judgments used to determine the appropriate transaction classification, which must be documented upon the inception of each contract. The two categories with the most judgment required for Southern Power are described further below.
Lease Transactions
Southern Power considers the terms of a sales contract to determine whether it should be accounted for as a lease. A contract is or contains a lease if the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. If the contract meets the criteria for a lease, Southern Power performs further analysis to determine whether the lease is classified as operating, financing, or sales-type. Generally, Southern Power's power sales contracts that are determined to be leases are accounted for as operating leases and the capacity revenue is recognized on a straight-line basis over the term of the contract and is included in Southern Power's operating revenues. Energy revenues and other contingent revenues are recognized in the period the energy is delivered or the service is rendered. For those contracts that are determined to be sales-type leases, capacity revenues are recognized by accounting for interest income on the net investment in the lease and are included in Southern Power's operating revenues. See Note 9 to the financial statements for additional information.
Normal Sale Derivative Transactions and Contracts with Customers
If the power sales contract is not classified as a lease, Southern Power further considers whether the contract meets the definition of a derivative. If the contract does meet the definition of a derivative, Southern Power will assess whether it can be designated as
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a normal sale contract. The determination of whether a contract can be designated as a normal sale contract requires judgment, including whether the sale of electricity involves physical delivery in quantities within Southern Power's available generating capacity and that the purchaser will take quantities expected to be used or sold in the normal course of business.
Contracts that do not meet the definition of a derivative or are designated as normal sales are accounted for as revenue from contracts with customers. For contracts that have a capacity charge, the revenue is generally recognized in the period that it becomes billable. Revenues related to energy and ancillary services are recognized in the period the energy is delivered or the service is rendered. See Note 4 to the financial statements for additional information.
Acquisition Accounting (Southern Power)
Southern Power may acquire generation assets as part of its overall growth strategy. At the time of an acquisition, Southern Power will assess if these assets and activities meet the definition of a business. Acquisitions that meet the definition of a business are accounted for under the acquisition method, whereby the identifiable assets acquired, liabilities assumed, and any noncontrolling interests (including any intangible assets, primarily related to acquired PPAs) are recognized and measured at fair value. Assets acquired that do not meet the definition of a business are accounted for as an asset acquisition. The purchase price of each asset acquisition is allocated based on the relative fair value of assets acquired.
Determining the fair value of assets acquired and liabilities assumed requires management judgment and Southern Power may engage independent valuation experts to assist in this process. Fair values are determined by using market participant assumptions and typically include the timing and amounts of future cash flows, incurred construction costs, the nature of acquired contracts, discount rates, power market prices, and expected asset lives. For potential or successful acquisitions that meet the definition of a business, any due diligence or transaction costs incurred are expensed as incurred. If the acquisition is an asset acquisition, direct and incremental transaction costs can be capitalized as a component of the cost of the assets acquired.
See Note 13 to the financial statements for additional fair value information and Note 15 to the financial statements for additional information on recent acquisitions.
Variable Interest Entities (Southern Power)
Southern Power enters into partnerships with varying ownership structures. Upon entering into these arrangements, membership interests and other variable interests are evaluated to determine if the legal entity is a VIE. If the legal entity is a VIE, Southern Power will assess if it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE, making it the primary beneficiary. Making this determination may require significant management judgment.
If Southern Power is the primary beneficiary and is considered to have a controlling ownership, the assets, liabilities, and results of operations of the entity are consolidated. If Southern Power is not the primary beneficiary, the legal entity is generally accounted for under the equity method of accounting. Southern Power reconsiders its conclusions as to whether the legal entity is a VIE and whether it is the primary beneficiary for events that impact the rights of variable interests, such as ownership changes in membership interests.
Southern Power has controlling ownership in certain legal entities for which the contractual provisions represent profit-sharing arrangements because the allocations of cash distributions and tax benefits are not based on fixed ownership percentages. For these arrangements, the noncontrolling interest is accounted for under a balance sheet approach utilizing the HLBV method. The HLBV method calculates each partner's share of income based on the change in net equity the partner can legally claim in a HLBV at the end of the period compared to the beginning of the period.
Contingent Obligations (All Registrants)
The Registrants are subject to a number of federal and state laws and regulations, as well as other factors and conditions that subject them to environmental, litigation, and other risks. See FUTURE EARNINGS POTENTIAL herein and Notes 2 and 3 to the financial statements for more information regarding certain of these contingencies. The Registrants periodically evaluate their exposure to such risks and record reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the results of operations, cash flows, or financial condition of the Registrants.
Recently Issued Accounting Standards
See Note 1 to the financial statements under "Recently Adopted Accounting Standards" for additional information.
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FINANCIAL CONDITION AND LIQUIDITY
Overview
The financial condition of each Registrant remained stable at December 31, 2023. The Registrants' cash requirements primarily consist of funding ongoing operations, including unconsolidated subsidiaries, as well as common stock dividends, capital expenditures, and debt maturities. Southern Power's cash requirements also include distributions to noncontrolling interests. Capital expenditures and other investing activities for the traditional electric operating companies include investments to build new generation facilities to meet projected long-term demand requirements and to replace units being retired as part of the generation fleet transition, to maintain existing generation facilities, to comply with environmental regulations including adding environmental modifications to certain existing generating units and closures of ash ponds, to expand and improve transmission and distribution facilities, and for restoration following major storms. Southern Power's capital expenditures and other investing activities may include acquisitions or new construction associated with its overall growth strategy and to maintain its existing generation fleet's performance. Southern Company Gas' capital expenditures and other investing activities include investments to meet projected long-term demand requirements, to maintain existing natural gas distribution systems as well as to update and expand these systems, and to comply with environmental regulations. See "Cash Requirements" herein for additional information.
Operating cash flows provide a substantial portion of the Registrants' cash needs. During 2023, Southern Power utilized tax credits, which provided $332 million in operating cash flows. For the three-year period from 2024 through 2026, projected stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows for each of Southern Company, the traditional electric operating companies, and Southern Company Gas. Southern Company plans to finance future cash needs in excess of its operating cash flows through one or more of the following: accessing borrowings from financial institutions, issuing debt and hybrid securities in the capital markets, and/or through its stock plans. Each Subsidiary Registrant plans to finance its future cash needs in excess of its operating cash flows primarily through external securities issuances, borrowings from financial institutions, and equity contributions from Southern Company. In addition, Southern Power may utilize tax equity partnership contributions. The Registrants plan to use commercial paper to manage seasonal variations in operating cash flows and for other working capital needs and continue to monitor their access to short-term and long-term capital markets as well as their bank credit arrangements to meet future capital and liquidity needs. See "Sources of Capital" and "Financing Activities" herein for additional information.
The Registrants' investments in their qualified pension plans and Alabama Power's and Georgia Power's investments in their nuclear decommissioning trust funds increased in value at December 31, 2023 as compared to December 31, 2022. No contributions to the qualified pension plan were made during 2023 and no mandatory contributions to the qualified pension plans are anticipated during 2024. See Notes 6 and 11 to the financial statements under "Nuclear Decommissioning" and "Pension Plans," respectively, for additional information.
At the end of 2023, the market price of Southern Company's common stock was $70.12 per share (based on the closing price as reported on the NYSE) and the book value was $28.83 per share, representing a market-to-book value ratio of 243%, compared to $71.41, $27.93, and 256%, respectively, at the end of 2022.
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Cash Requirements
Capital Expenditures
Total estimated capital expenditures, including LTSA and nuclear fuel commitments, for the Registrants through 2028 based on their current construction programs are as follows:
20242025202620272028
(in billions)
Southern Company(a)(b)
$10.0 $9.4 $8.5 $8.6 $8.7 
Alabama Power2.1 2.0 1.9 2.0 1.9 
Georgia Power(a)
5.4 5.0 4.4 4.5 4.7 
Mississippi Power0.3 0.3 0.2 0.3 0.3 
Southern Power(b)
0.3 0.2 0.1 0.1 0.1 
Southern Company Gas1.8 1.8 1.7 1.7 1.7 
(a)Includes expenditures of approximately $0.2 billion in 2024 for the construction of Plant Vogtle Unit 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information. Also includes certain expenditures related to the construction of Plant Yates Units 8 through 10 as requested in Georgia Power's 2023 IRP Update filing, which is subject to the approval of the Georgia PSC. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
(b)Includes $0.1 billion in both 2024 and 2025 related to the South Cheyenne and Millers Branch solar projects. Excludes approximately $0.8 billion annually for Southern Power's planned acquisitions and placeholder growth, which may vary materially due to market opportunities and Southern Power's ability to execute its growth strategy. Also excludes estimated capital expenditures associated with the phase two expansion of the Millers Branch solar project, which was committed to subsequent to December 31, 2023. See Note 15 to the financial statements under "Southern Power" for additional information regarding the South Cheyenne and Millers Branch solar projects.
These capital expenditures include estimates to comply with environmental laws and regulations, but do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See FUTURE EARNINGS POTENTIAL – "Environmental Matters" herein for additional information. At December 31, 2023, significant purchase commitments were outstanding in connection with the Registrants' construction programs.
The traditional electric operating companies also anticipate continued expenditures associated with closure and monitoring of ash ponds and landfills in accordance with the CCR Rule and the related state rules, which are reflected in the applicable Registrants' ARO liabilities. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. These estimated costs are likely to change, and could change materially, as assumptions and details pertaining to closure are refined and compliance activities continue. Current estimates of these costs through 2028 are provided in the table below. Material expenditures in future years for ARO settlements will also be required for ash ponds, nuclear decommissioning (for Alabama Power and Georgia Power), and other liabilities reflected in the applicable Registrants' AROs, as discussed further in Note 6 to the financial statements. Also see FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein.
20242025202620272028
(in millions)
Southern Company$728 $767 $762 $725 $669 
Alabama Power346 364 299 237 216 
Georgia Power338 347 429 450 450 
Mississippi Power24 30 17 
The construction programs are subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; changes in environmental laws and regulations; the outcome of any legal challenges to environmental rules; changes in electric generating plants, including unit retirements and replacements and adding or changing fuel sources at existing electric generating units, to meet regulatory requirements; changes in FERC rules and regulations; state regulatory agency approvals; changes in the expected environmental compliance program; changes in legislation and/or regulation; the cost, availability, and efficiency of construction labor, equipment, and materials; project scope and design changes; abnormal weather; delays in construction due to judicial or regulatory action; storm impacts; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures and AROs will be fully recovered. Additionally, expenditures associated with Southern Power's planned
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acquisitions may vary due to market opportunities and the execution of its growth strategy. See Note 15 to the financial statements under "Southern Power" for additional information regarding Southern Power's plant acquisitions and construction projects.
The construction program of Georgia Power includes Plant Vogtle Unit 4, which includes components based on new technology that only within the last several years began initial operation in the global nuclear industry at this scale and which may be subject to additional revised cost estimates during construction. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for information regarding Plant Vogtle Unit 4 and additional factors that may impact construction expenditures.
See FUTURE EARNINGS POTENTIAL – "Construction Programs" herein for additional information.
Other Significant Cash Requirements
Long-term debt maturities and the interest payable on long-term debt each represent a significant cash requirement for the Registrants. See Note 8 to the financial statements for information regarding the Registrants' long-term debt at December 31, 2023, the weighted average interest rate applicable to each long-term debt category, and a schedule of long-term debt maturities over the next five years. The Registrants plan to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Fuel and purchased power costs represent a significant component of funding ongoing operations for the traditional electric operating companies and Southern Power. See Note 3 to the financial statements under "Commitments" for information on Southern Company Gas' commitments for pipeline charges, storage capacity, and gas supply. Total estimated costs for fuel and purchased power commitments at December 31, 2023 for the applicable Registrants are provided in the table below. Fuel costs include purchases of coal (for the traditional electric operating companies) and natural gas (for the traditional electric operating companies and Southern Power), as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery; the amounts reflected below have been estimated based on the NYMEX future prices at December 31, 2023. As discussed under "Capital Expenditures" herein, estimated expenditures for nuclear fuel are included in the applicable Registrants' construction programs for the years 2024 through 2028. Nuclear fuel commitments at December 31, 2023 that extend beyond 2028 are included in the table below. Purchased power costs represent estimated minimum obligations for various PPAs for the purchase of capacity and energy, except for those accounted for as leases, which are discussed in Note 9 to the financial statements.
20242025202620272028Thereafter
(in millions)
Southern Company(*)
$3,347 $3,151 $2,201 $1,738 $1,171 $4,820 
Alabama Power1,210 1,181 819 619 328 1,136 
Georgia Power(*)
1,262 1,111 696 579 471 2,008 
Mississippi Power377 420 338 263 213 1,002 
Southern Power558 502 414 346 232 674 
(*)Excludes capacity payments related to Plant Vogtle Units 1 and 2, which are discussed in Note 3 to the financial statements under "Commitments."
In connection with Georgia Power's 2022 IRP, the Georgia PSC approved five affiliate PPAs with Southern Power, which are expected to be accounted for as leases, and are contingent upon approval by the FERC. The expected capacity payments associated with the PPAs total $5 million in 2024, $68 million in 2025, $75 million in 2026, $76 million in 2027, $86 million in 2028, and $584 million thereafter. In connection with Georgia Power's 2023 IRP Update, Georgia Power has requested certification of a non-affiliate PPA, which is expected to be accounted for as a lease and is contingent upon approval by the Georgia PSC. The expected capacity payments associated with the PPA are $10 million in 2024, $17 million in 2025, $18 million in 2026, $19 million in 2027, and $19 million in 2028. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
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The traditional electric operating companies and Southern Power have entered into LTSAs for the purpose of securing maintenance support for certain of their generating facilities. See Note 1 to the financial statements under "Long-term Service Agreements" for additional information. As discussed under "Capital Expenditures" herein, estimated expenditures related to LTSAs are included in the applicable Registrants' construction programs for the years 2024 through 2028. Total estimated payments for LTSA commitments at December 31, 2023 that extend beyond 2028 are provided in the following table and include price escalation based on inflation indices:
Southern
Company
Alabama PowerGeorgia
Power
Mississippi PowerSouthern Power
(in millions)
LTSA commitments (after 2028)$1,594 $262 $252 $152 $928 
In addition, Southern Power has certain other operations and maintenance agreements. Total estimated costs for these commitments at December 31, 2023 are provided in the table below.
20242025202620272028Thereafter
(in millions)
Southern Power's operations and maintenance agreements$74 $45 $33 $30 $30 $226 
See Note 9 to the financial statements for information on the Registrants' operating lease obligations, including a maturity analysis of the lease liabilities over the next five years and thereafter.
Sources of Capital
Southern Company intends to meet its future capital needs through operating cash flows, borrowings from financial institutions, and debt, hybrid, and/or equity issuances. Equity capital can be provided from any combination of Southern Company's stock plans, private placements, or public offerings.
The Subsidiary Registrants plan to obtain the funds to meet their future capital needs from sources similar to those they used in the past, which were primarily from operating cash flows, external securities issuances, borrowings from financial institutions, and equity contributions from Southern Company. Operating cash flows provide a substantial portion of the Registrants' cash needs. Georgia Power intends to utilize a mix of senior note issuances, short-term floating rate bank loans, and commercial paper issuances to continue funding operating cash flows related to fuel cost under recovery.
The amount, type, and timing of any financings in 2024, as well as in subsequent years, will be contingent on investment opportunities and the Registrants' capital requirements and will depend upon prevailing market conditions, regulatory approvals (for certain of the Subsidiary Registrants), and other factors. See "Cash Requirements" herein for additional information.
Southern Power utilizes tax equity partnerships as one of its financing sources, where the tax partner takes significantly all of the federal tax benefits. These tax equity partnerships are consolidated in Southern Power's financial statements and are accounted for using HLBV methodology to allocate partnership gains and losses. During 2023, Southern Power obtained tax equity funding for existing tax equity partnerships totaling $21 million. See Notes 1 and 15 to the financial statements under "General" and "Southern Power," respectively, for additional information.
The issuance of securities by the traditional electric operating companies and Nicor Gas is generally subject to the approval of the applicable state PSC or other applicable state regulatory agency. The issuance of all securities by Mississippi Power and short-term securities by Georgia Power is generally subject to regulatory approval by the FERC. Additionally, with respect to the public offering of securities, Southern Company, the traditional electric operating companies, and Southern Power (excluding its subsidiaries), Southern Company Gas Capital, and Southern Company Gas (excluding its other subsidiaries) file registration statements with the SEC under the Securities Act of 1933, as amended (1933 Act). The amounts of securities authorized by the appropriate regulatory authorities, as well as the securities registered under the 1933 Act, are closely monitored and appropriate filings are made to ensure flexibility in the capital markets.
The Registrants generally obtain financing separately without credit support from any affiliate. See Note 8 to the financial statements under "Bank Credit Arrangements" for additional information. The Southern Company system does not maintain a centralized cash or money pool. Therefore, funds of each company are not commingled with funds of any other company in the Southern Company system, except in the case of Southern Company Gas, as described below.
The traditional electric operating companies and SEGCO may utilize a Southern Company subsidiary organized to issue and sell commercial paper at their request and for their benefit. Proceeds from such issuances for the benefit of an individual company are loaned directly to that company. The obligations of each traditional electric operating company and SEGCO under these
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arrangements are several and there is no cross-affiliate credit support. Alabama Power also maintains its own separate commercial paper program.
Southern Company Gas Capital obtains external financing for Southern Company Gas and its subsidiaries, other than Nicor Gas, which obtains financing separately without credit support from any affiliates. Southern Company Gas maintains commercial paper programs at Southern Company Gas Capital and Nicor Gas. Nicor Gas' commercial paper program supports its working capital needs as Nicor Gas is not permitted to make money pool loans to affiliates. All of the other Southern Company Gas subsidiaries benefit from Southern Company Gas Capital's commercial paper program.
By regulation, Nicor Gas is restricted, up to its retained earnings balance, in the amount it can dividend or loan to affiliates and is not permitted to make money pool loans to affiliates. At December 31, 2023, the amount of subsidiary retained earnings restricted to dividend totaled $1.7 billion. This restriction did not impact Southern Company Gas' ability to meet its cash obligations, nor does management expect such restriction to materially impact Southern Company Gas' ability to meet its currently anticipated cash obligations.
Certain Registrants' current liabilities frequently exceed their current assets because of long-term debt maturities and the periodic use of short-term debt as a funding source, as well as significant seasonal fluctuations in cash needs. The Registrants generally plan to refinance long-term debt as it matures. See Note 8 to the financial statements for additional information. Also see "Financing Activities" herein for information on financing activities that occurred subsequent to December 31, 2023. The following table shows the amount by which current liabilities exceeded current assets at December 31, 2023 for the applicable Registrants:
At December 31, 2023Southern
Company
Georgia
Power
Mississippi PowerSouthern Company Gas
(in millions)
Current liabilities in excess of current assets$3,035 $1,674 $314 $222 
The Registrants believe the need for working capital can be adequately met by utilizing operating cash flows, as well as commercial paper, lines of credit, and short-term bank notes, as market conditions permit. In addition, under certain circumstances, the Subsidiary Registrants may utilize equity contributions and/or loans from Southern Company.
Bank Credit Arrangements
At December 31, 2023, the Registrants' unused committed credit arrangements with banks were as follows:
At December 31, 2023Southern
Company
parent
Alabama PowerGeorgia
Power
Mississippi Power
Southern
 Power(a)
Southern Company Gas(b)
SEGCOSouthern
Company
(in millions)
Unused committed credit$1,998 $1,350 $1,726 $275 $589 $1,598 $30 $7,566 
(a)At December 31, 2023, Southern Power also had two continuing letters of credit facilities for standby letters of credit, of which $15 million was unused. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities.
(b)Includes $798 million and $800 million at Southern Company Gas Capital and Nicor Gas, respectively.
Subject to applicable market conditions, the Registrants, Nicor Gas, and SEGCO expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, the Registrants, Nicor Gas, and SEGCO may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
A portion of the unused credit with banks is allocated to provide liquidity support to certain revenue bonds of the traditional electric operating companies and the commercial paper programs of the Registrants, Nicor Gas, and SEGCO. At December 31, 2023, outstanding variable rate demand revenue bonds of the traditional electric operating companies with allocated liquidity support totaled approximately $1.7 billion (comprised of approximately $818 million at Alabama Power, $819 million at Georgia Power, and Gulf Power, the elimination in consolidation of a Southern Power PPA that was remarketed from a third party to$69 million at Mississippi Power). In addition, at December 31, 2023, Georgia Power had approximately $325 million of fixed rate revenue bonds outstanding that are required to be remarketed within the next 12 months. The variable rate demand revenue bonds and fixed rate revenue bonds required to be remarketed within the next 12 months are classified as long-term debt on the balance sheets as a result of available long-term committed credit.
See Note 8 to the financial statements under "Bank Credit Arrangements" for additional information.
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Short-term Borrowings
The Registrants, Nicor Gas, and SEGCO make short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above. Southern Power's subsidiaries are not issuers or obligors under its commercial paper program. Commercial paper and short-term bank term loans are included in January 2016,notes payable in the balance sheets. Details of the Registrants' short-term borrowings were as follows:
Short-term Debt at the End of the Period
Amount
Outstanding
Weighted Average
Interest Rate
December 31,December 31,
202320222021202320222021
(in millions)
Southern Company$2,314 $2,609 $1,440 5.7 %4.9 %0.4 %
Alabama Power40 — — 5.5 — — 
Georgia Power1,329 1,600 — 5.9 5.0 — 
Southern Power138 225 211 5.5 4.7 0.3 
Southern Company Gas:
Southern Company Gas Capital$23 $285 $379 5.5 %4.8 %0.3 %
Nicor Gas392 483 830 5.5 4.7 0.4 
Southern Company Gas Total$415 $768 $1,209 5.5 %4.7 %0.4 %
Short-term Debt During the Period(*)
Average Amount OutstandingWeighted Average
Interest Rate
Maximum Amount Outstanding
202320222021202320222021202320222021
(in millions)(in millions)
Southern Company$2,191 $1,995 $1,141 5.6 %2.2 %0.3 %$3,270 $2,894 $1,809 
Alabama Power44 27 5.0 2.1 0.1 230 200 200 
Georgia Power1,440 673 95 5.8 3.1 0.2 2,260 1,710 407 
Mississippi Power56 15 5.5 1.6 0.2 169 71 81 
Southern Power158 166 133 5.6 2.3 0.2 359 350 520 
Southern Company Gas:
Southern Company Gas Capital$163 $279 $206 5.3 %1.8 %0.2 %$440 $547 $485 
Nicor Gas88 349 420 5.1 2.1 0.4 483 830 897 
Southern Company Gas Total$251 $628 $626 5.2 %2.0 %0.4 %
(*)    Average and unit retirements atmaximum amounts are based upon daily balances during the 12-month periods ended December 31, 2023, 2022, and 2021.
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Analysis of Cash Flows
Net cash flows provided from (used for) operating, investing, and financing activities in 2023 and 2022 are presented in the following table:
Net cash provided from (used for):Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Operating activities$7,553 $2,079 $2,752 $369 $1,096 $1,762 
Investing activities(9,668)(2,196)(5,079)(370)(265)(1,656)
Financing activities999 (161)1,922 (20)(820)(154)
2022
Operating activities$6,302 $1,639 $2,038 $383 $815 $1,519 
Investing activities(8,430)(2,263)(3,954)(317)(194)(1,580)
Financing activities2,336 251 2,363 (68)(623)96 
Fluctuations in cash flows from financing activities vary from year to year based on capital needs and the maturity or redemption of securities.
Southern Company
Net cash provided from operating activities increased $1.3 billion in 2023 as compared to 2022 primarily due to increased fuel cost recovery and the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to the Subsidiary Registrants' construction programs.
The net cash provided from financing activities in 2023 was primarily related to net issuances of long-term debt and an increase in commercial paper borrowings, partially offset by common stock dividend payments and net repayments of short-term bank loans. The net cash provided from financing activities in 2022 was primarily related to net issuances of long-term debt, the issuance of common stock to settle the purchase contracts entered into as part of the Equity Units (as discussed in Note 8 to the financial statements under "Equity Units"), and an increase in short-term borrowings, partially offset by common stock dividend payments.
Alabama Power
Net cash provided from operating activities increased $440 million in 2023 as compared to 2022 primarily due to an increase in fuel cost recovery and the timing of customer receivable collections, partially offset by the timing of vendor payments and fuel stock purchases.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions, including approximately $79 million and $211 million, respectively, related to the construction of Plant Barry Unit 8 and, for 2022, $171 million related to the acquisition of the Calhoun Generating Station. See Notes 2 and 15 to the financial statements under "Alabama Power" for additional information.
The net cash used for financing activities in 2023 was primarily related to common stock dividend payments, largely offset by net issuances of long-term debt and capital contributions from Southern Company. The net cash provided from financing activities in 2022 was primarily related to net long-term debt issuances and capital contributions from Southern Company, partially offset by common stock dividend payments and preferred stock redemptions.
Georgia Power
Net cash provided from operating activities increased $714 million in 2023 as compared to 2022 primarily due to increased fuel cost recovery, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions, including approximately $1.1 billion and $1.0 billion, respectively, related to the construction of Plant Vogtle Units 3 and 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on construction of Plant Vogtle Units 3 and 4.
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The net cash provided from financing activities in 2023 was primarily related to capital contributions from Southern Company, net issuances of senior notes, an increase in commercial paper borrowings, and reofferings of pollution control revenue bonds which were previously held by Georgia Power, partially offset by common stock dividend payments and a net decrease in short-term borrowings. The net cash provided from financing activities in 2022 was primarily related to a net increase in short-term bank debt, capital contributions from Southern Company, and net issuances of senior notes, partially offset by common stock dividend payments.
Mississippi Power
Net cash provided from operating activities decreased $14 million in 2023 as compared to 2022 primarily due to the timing of vendor payments, partially offset by a decrease in power pool sales and the timing of customer receivable collections.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions.
The net cash used for financing activities in 2023 was primarily related to common stock dividend payments, partially offset by the issuance of senior notes. The net cash used for financing activities in 2022 was primarily related to common stock dividend payments, partially offset by capital contributions from Southern Company and the issuance of revenue bonds.
Southern Power
Net cash provided from operating activities increased $281 million in 2023 as compared to 2022 primarily due to an increase in the utilization of tax credits and the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 was primarily related to the acquisitions of the South Cheyenne and Millers Branch solar facilities and ongoing construction activities. The net cash used for investing activities in 2022 was primarily related to ongoing construction activities. See Note 15 to the financial statements under "Southern Power" for additional information.
The net cash used for financing activities in 2023 was primarily related to the repayment of senior notes at maturity, common stock dividend payments, net distributions to noncontrolling interests, and net repayments of short-term debt. The net cash used for financing activities in 2022 was primarily related to the repayment of senior notes at maturity, common stock dividend payments, and net capital distributions to noncontrolling interests, partially offset by capital contributions from Southern Company.
Southern Company Gas
Net cash provided from operating activities increased $243 million in 2023 as compared to 2022 primarily due to the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to construction of transportation and distribution assets recovered through base rates and infrastructure investment recovered through replacement programs at gas distribution operations, partially offset by proceeds from dispositions. See Note 15 to the financial statements for additional information.
The net cash used for financing activities in 2023 was primarily related to repayment of short-term borrowings and common stock dividend payments, partially offset by net issuances of long-term debt and capital contributions from Southern Company. The net cash provided from financing activities in 2022 was primarily related to net issuances of long-term debt and capital contributions from Southern Company, partially offset by common stock dividend payments and a decrease in short-term borrowings.
Significant Balance Sheet Changes
Southern Company
Significant balance sheet changes in 2023 for Southern Company included:
an increase of $5.3 billion in total property, plant, and equipment primarily related to the Subsidiary Registrants' construction programs;
an increase of $4.7 billion in long-term debt (including securities due within one year) related to new issuances;
a decrease of $1.2 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Southern Company" herein;
an increase of $1.0 billion in total common stockholders' equity primarily related to net income, partially offset by common stock dividend payments;
an increase of $1.0 billion in accumulated deferred income taxes primarily related to an increase in property-related timing differences and the expected utilization of ITCs;
a decrease of $0.6 billion in accounts payable primarily related to the timing of vendor payments;
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a decrease of $0.6 billion in deferred credits related to income taxes primarily due to the flowback of excess deferred income taxes; and
a decrease of $0.5 billion in AROs primarily due to cost estimate updates at Georgia Power for ash pond closures.
See "Financing Activities" herein and Notes 2, 5, 6, 8, and 10 to the financial statements for additional information.
Alabama Power
Significant balance sheet changes in 2023 for Alabama Power included:
an increase of $0.8 billion in total property, plant, and equipment primarily related to the construction of Plant Barry Unit 8 and construction of distribution and transmission facilities;
an increase of $0.6 billion in total common stockholder's equity primarily due to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company;
an increase of $0.6 billion in long-term debt (including securities due within one year) primarily due to the issuance of senior notes and revenue bonds;
a decrease of $0.4 billion in deferred credits related to income taxes primarily due to the flowback of excess deferred income taxes;
a decrease of $0.4 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Alabama Power" herein; and
a decrease of $0.2 billion in other regulatory assets, deferred primarily due to a new wholesale contractdecrease in deferred under recovered fuel costs.
See "Financing Activities – Alabama Power" herein and Notes 2, 5, and 8 to the financial statements for additional information.
Georgia Power
Significant balance sheet changes in 2023 for Georgia Power included:
an increase of $3.5 billion in total property, plant, and equipment primarily related to the construction of generation, transmission, and distribution facilities, including $1.2 billion for Plant Vogtle Units 3 and 4;
an increase of $2.5 billion in common stockholder's equity primarily due to capital contributions from Southern Company and net income, partially offset by dividends paid to Southern Company;
an increase of $1.8 billion in long-term debt (including securities due within one year) primarily due to net issuances of senior notes;
decreases of $0.4 billion in AROs and $0.3 billion in regulatory assets associated with AROs primarily due to cost estimate updates for ash pond closures;
a decrease of $0.4 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Georgia Power" herein;
an increase of $0.3 billion in accumulated deferred income taxes primarily due to an increase in property-related timing differences; and
a decrease of $0.3 billion in notes payable primarily due to net repayments of short-term bank debt, largely offset by an increase in commercial paper borrowings.
See "Financing Activities – Georgia Power" herein and Notes 2, 5, 6,8, and 10 to the financial statements for additional information.
Mississippi Power
Significant balance sheet changes in 2023 for Mississippi Power included:
an increase of $161 million in total property, plant, and equipment primarily related to the construction of generation, transmission, and distribution facilities;
an increase of $99 million in long-term debt (including securities due within one year) primarily due to issuances of senior notes;
an increase of $72 million in common stockholder's equity related to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company; and
a decrease of $53 million in affiliated receivables primarily due to a decrease in power pool sales.
See "Financing Activities – Mississippi Power" herein and Notes 5 and 8 to the financial statements for additional information.
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Southern Power
Significant balance sheet changes in 2023 for Southern Power included:
an increase of $335 million in accumulated deferred income taxes primarily related to the expected utilization of ITCs;
a decrease of $268 million in long-term debt (including securities due within one year) primarily due to the repayment of senior notes at maturity;
a decrease of $218 million in total stockholder's equity primarily due to dividends paid to Southern Company and net distributions to noncontrolling interests, partially offset by net income and capital contributions from Southern Company; and
a decrease of $189 million in total property, plant, and equipment in service primarily due to continued depreciation of assets, partially offset by an increase in construction work in progress primarily related to the acquisition of the South Cheyenne and Millers Branch solar facilities.
See "Financing Activities – Southern Power" herein and Notes 5, 8, and 15 to the financial statements for additional information.
Southern Company Gas
Significant balance sheet changes in 2023 for Southern Company Gas included:
an increase of $1.1 billion in total property, plant, and equipment primarily related to the construction of transportation and distribution assets and additional infrastructure investment;
a decrease of $0.4 billion in total accounts receivable primarily relating to decreases of $0.2 billion in customer accounts receivable and $0.2 billion in unbilled revenues as a result of seasonality;
an increase of $0.4 billion in common stockholder's equity related to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company;
an increase of $0.4 billion in long-term debt (including securities due within one year) due to issuances of senior notes and first mortgage bonds;
a decrease of $0.4 billion in notes payable due to repayments of short-term debt and commercial paper borrowings;
a decrease of $0.3 billion in other accounts payable due to the timing of vendor payments; and
an increase of $0.2 billion in natural gas cost over recovery primarily due to lower natural gas prices and the timing of natural gas purchases.
See "Financing Activities – Southern Company Gas" herein and Notes 2, 5, and 8 to the financial statements for additional information.
Financing Activities
The following table outlines the Registrants' long-term debt financing activities for the year ended December 31, 2023:
Issuances and ReofferingsMaturities and Redemptions
CompanySenior NotesRevenue
Bonds
Other Long-Term DebtSenior
Notes
Revenue Bonds
Other Long-Term Debt(a)
(in millions)
Southern Company parent$4,525 $— $— $1,850 $— $550 
Alabama Power500 326 29 300 — 
Georgia Power2,450 229 — 800 — 102 
Mississippi Power100 — — — — 
Southern Power— — — 290 — — 
Southern Company Gas500 — 312 350 — 50 
Other— — — — — 
Elimination(b)
— — — — — (9)
Southern Company$8,075 $555 $341 $3,590 $— $704 
(a)Includes reductions in finance lease obligations resulting from cash payments under finance leases and, for Georgia Power, principal amortization payments totaling $86 million for FFB borrowings. See Note 8 to the financial statements under "Long-term Debt – DOE Loan Guarantee Borrowings" for additional information.
(b)Represents reductions in affiliate finance lease obligations at Georgia Power, which are eliminated in Southern Company's consolidated financial statements.
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Except as otherwise described herein, the Registrants used the proceeds of debt issuances for their redemptions and maturities shown in the table above, to repay short-term indebtedness, and for general corporate purposes, including working capital. The Subsidiary Registrants also used the proceeds for their construction programs.
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Registrants plan to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Southern Company
During 2023, Southern Company issued approximately 2.1 million shares of common stock primarily through equity compensation plans and received proceeds of approximately $36 million.
In January 2023, Southern Company redeemed all $550 million aggregate principal amount of its Series 2016B Junior Subordinated Notes due March 15, 2057.
In February 2023, Southern Company issued $1.5 billion aggregate principal amount of its Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes) in a private offering. In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option. See Note 8 to the financial statements under "Convertible Senior Notes" for additional information.
In May 2023, Southern Company repaid at maturity $600 million aggregate principal amount of its 2021C Floating Rate Senior Notes.
Also in May 2023, Southern Company issued $750 million aggregate principal amount of Series 2023B 4.85% Senior Notes due June 15, 2028 and $750 million aggregate principal amount of Series 2023C 5.20% Senior Notes due June 15, 2033.
In July 2023, Southern Company repaid at maturity $1.25 billion aggregate principal amount of its 2.95% Senior Notes.
In September 2023, Southern Company issued $600 million aggregate principal amount of Series 2023D 5.50% Senior Notes due March 15, 2029 and $700 million aggregate principal amount of Series 2023E 5.70% Senior Notes due March 15, 2034.
Alabama Power
During 2023, a subsidiary of Alabama Power borrowed $20 million under a $39 million long-term floating rate bank loan entered into in December 2022 with a maturity date of December 12, 2029.
In May 2023, Alabama Power issued $200 million aggregate principal amount of Series 2023A Floating Rate Senior Notes due May 15, 2073.
In August 2023, the Walker County Economic and Industrial Development Authority issued for the benefit of Alabama Power $228 million aggregate principal amount of Solid Waste Disposal Revenue Bonds (Alabama Power Company Plant Gorgas Project), First Series 2023 ($140 million aggregate principal amount) and Second Series 2023 ($88 million aggregate principal amount) due August 1, 2063. The proceeds from the revenue bonds are being used to finance certain solid waste disposal facilities at Plant Gorgas.
Also in August 2023, the Industrial Development Board of the Town of West Jefferson issued for the benefit of Alabama Power $98 million aggregate principal amount of Solid Waste Disposal Revenue Bonds (Alabama Power Company Plant Miller Project), Series 2023 due August 1, 2063. The proceeds from the revenue bonds are being used to finance certain solid waste disposal facilities at Plant Miller.
In September 2023, a subsidiary of Alabama Power assumed two fixed rate bank loans totaling $9 million, which it repaid in December 2023 using approximately $9 million of borrowings under a new $20 million fixed rate bank loan maturing December 2030.
In November 2023, Alabama Power issued $300 million aggregate principal amount of Series 2023B 5.85% Senior Notes due November 15, 2033.
In December 2023, Alabama Power repaid at maturity $300 million aggregate principal amount of its Series 2013A 3.55% Senior Notes.
Subsequent to December 31, 2023, Alabama Power received a capital contribution of $425 million from Southern Company and also repaid at maturity approximately $21 million aggregate principal amount of Industrial Development Board of the Town of Wilsonville (Alabama) Pollution Control Revenue Bonds (Alabama Power Company Gaston Plant Project), Series D.
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Georgia Power
In March 2023, Georgia Power reoffered to the public the following pollution control revenue bonds that previously had been purchased and were held by Georgia Power at December 31, 2022:
approximately $28 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), Second Series 2006;
approximately $89 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), Second Series 2009;
approximately $49 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), First Series 2012;
approximately $18 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), First Series 2013; and
$46 million aggregate principal amount of Development Authority of Burke County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Vogtle Project), First Series 1996.
Also in March 2023, Georgia Power borrowed $100 million pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand. In April 2023, Georgia Power borrowed an additional $150 million under the arrangement. In May 2023, Georgia Power repaid the aggregate $250 million outstanding.
Also in March 2023, Georgia Power repaid at maturity a $200 million short-term floating rate bank loan entered into in March 2022.
In April 2023, Georgia Power repaid at maturity $100 million aggregate principal amount of its Series N 5.750% Senior Notes.
Also in April 2023, Georgia Power repaid at maturity a $200 million short-term floating rate bank loan entered into in April 2022.
In May 2023, Georgia Power issued $750 million aggregate principal amount of Series 2023A 4.65% Senior Notes due May 16, 2028 and $1.0 billion aggregate principal amount of Series 2023B 4.95% Senior Notes due May 17, 2033.
In July 2023, Georgia Power repaid at maturity $700 million aggregate principal amount of its Series 2020A 2.10% Senior Notes.
In November 2023, Georgia Power issued $700 million aggregate principal amount of Series 2023C Floating Rate Senior Notes due May 8, 2025.
Also in November 2023, Georgia Power repaid $780 million of a $1.2 billion short-term floating rate bank loan entered into in November 2022 and extended the maturity of the remaining outstanding amount of $420 million to November 2024.
In December 2023 and subsequent to December 31, 2023, Georgia Power borrowed $100 million and $150 million, respectively, pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand.
Mississippi Power
In March 2023, Mississippi Power borrowed $50 million of short-term debt pursuant to its $125 million revolving credit arrangement, which it repaid in June 2023.
In June 2023, Mississippi Power issued in a private placement $65 million aggregate principal amount of Series 2023A 5.64% Senior Notes due July 15, 2026 and $35 million aggregate principal amount of Series 2023B 5.63% Senior Notes due July 15, 2033.
Southern Power
In January 2023, Southern Power borrowed $100 million pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand. During the second quarter 2023, Southern Power made net repayments of $50 million of the $100 million borrowed. In October 2023, Southern Power borrowed the remaining $50 million under the arrangement. In December 2023, Southern Power repaid the $100 million outstanding amount.
In September 2023, Southern Power repaid at maturity $290 million aggregate principal amount of its Series 2016C 2.75% Senior Notes.
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Southern Company Gas
In February 2023, Nicor Gas repaid its $150 million and $50 million short-term floating rate bank loans entered into in February 2022 and March 2022, respectively.
In July 2023, Nicor Gas issued in a private placement $50 million aggregate principal amount of 5.28% Series First Mortgage Bonds due July 31, 2030 and $75 million aggregate principal amount of 5.43% Series First Mortgage Bonds due July 31, 2035. In October 2023, pursuant to the same agreement, Nicor Gas issued in a private placement $75 million aggregate principal amount of 5.67% Series First Mortgage Bonds due October 31, 2053 and $75 million aggregate principal amount of 5.77% Series First Mortgage Bonds due October 31, 2063.
In September 2023, Southern Company Gas Capital issued $500 million aggregate principal amount of Series 2023A 5.75% Senior Notes due September 15, 2033, guaranteed by Southern Company Gas.
In October 2023, Southern Company Gas Capital repaid at maturity $350 million aggregate principal amount of its 2.450% Senior Notes.
In December 2023, Nicor Gas repaid at maturity $50 million aggregate principal amount of its 5.80% Series First Mortgage Bonds.
During 2023, Southern Company Gas received cash advances totaling $37 million under a long-term financing agreement related to a construction contract.
Credit Rating Risk
At December 31, 2023, the Registrants did not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the first quarter 2016.event of a credit rating change of certain Registrants to BBB and/or Baa2 or below. These contracts are primarily for physical electricity and natural gas purchases and sales, fuel purchases, fuel transportation and storage, energy price risk management, transmission, interest rate management, and, for Georgia Power, services at Plant Vogtle Units 3 and 4.
The maximum potential collateral requirements under these contracts at December 31, 2023 were as follows:
Credit Ratings
Southern Company(*)
Alabama PowerGeorgia PowerMississippi Power
Southern
Power(*)
Southern Company Gas
(in millions)
At BBB and/or Baa2$33 $$— $— $32 $— 
At BBB- and/or Baa3407 60 345 — 
At BB+ and/or Ba1 or below2,074 404 943 319 1,289 19 
(*)Southern Power has PPAs that could require collateral, but not accelerated payment, in the event of a downgrade of Southern Power's credit. The PPAs require credit assurances without stating a specific credit rating. The amount of collateral required would depend upon actual losses resulting from a credit downgrade. Southern Power had $106 million of cash collateral posted related to PPA requirements at December 31, 2023.
The amounts in the previous table for the traditional electric operating companies and Southern Power include certain agreements that could require collateral if either Alabama Power or Georgia Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Registrants to access capital markets and would be likely to impact the cost at which they do so.
Mississippi Power and its largest retail customer, Chevron Products Company (Chevron), have agreements under which Mississippi Power provides retail service to the Chevron refinery in Pascagoula, Mississippi through at least 2038. The agreements grant Chevron a security interest in the co-generation assets owned by Mississippi Power located at the refinery that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the three rating agencies.
On August 2, 2023, S&P revised its credit rating outlook for Southern Company and its subsidiaries to positive from stable.
On September 1, 2023, Fitch upgraded the senior unsecured long-term debt rating of Georgia Power to A- from BBB+ and revised the rating outlook to positive from stable.
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Also on September 1, 2023, Fitch revised the ratings outlook of Southern Company, Alabama Power, Southern Power, Nicor Gas, and SEGCO to stable from negative.
On September 26, 2023, Moody's upgraded Mississippi Power's senior unsecured long-term debt rating to A3 from Baa1 and revised its rating outlook to stable from positive.
Also on September 26, 2023, Moody's revised its ratings outlooks for Southern Company and Georgia Power to positive from stable.
Market Price Risk
The Registrants had no material change in market risk exposure for the year ended December 31, 2023 when compared to the year ended December 31, 2022. See Note 14 to the financial statements for an in-depth discussion of the Registrants' derivatives, as well as Note 1 to the financial statements under "Financial Instruments" for additional information.
Due to cost-based rate regulation and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities that sell natural gas directly to end-use customers continue to have limited exposure to market volatility in interest rates, foreign currency exchange rates, commodity fuel prices, and prices of electricity. The traditional electric operating companies and certain of the natural gas distribution utilities manage fuel-hedging programs implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies to hedge the impact of market fluctuations in natural gas prices for customers. Mississippi Power also manages wholesale fuel-hedging programs under agreements with its wholesale customers. Because energy from Southern Power's facilities is primarily sold under long-term PPAs with tolling agreements and provisions shifting substantially all of the responsibility for fuel cost to the counterparties, Southern Power's exposure to market volatility in commodity fuel prices and prices of electricity is generally limited. However, Southern Power has been and may continue to be exposed to market volatility in energy-related commodity prices as a result of uncontracted generating capacity. To mitigate residual risks relative to movements in electricity prices, the traditional electric operating companies and Southern Power may enter into physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market and, to a lesser extent, financial hedge contracts for natural gas purchases; however, a significant portion of contracts are priced at market.
Certain of Southern Company Gas' non-regulated operations routinely utilize various types of derivative instruments to economically hedge certain commodity price and weather risks inherent in the natural gas industry. These instruments include a variety of exchange-traded and OTC energy contracts, such as forward contracts, futures contracts, options contracts, and swap agreements. Southern Company Gas' gas marketing services business also actively manages storage positions through a variety of hedging transactions for the purpose of managing exposures arising from changing natural gas prices. These hedging instruments are used to substantially protect economic margins (as spreads between wholesale and retail natural gas prices widen between periods) and thereby minimize exposure to declining earnings. Some of these economic hedge activities may not qualify, or may not be designated, for hedge accounting treatment.
The following table provides information related to variable interest rate exposure on long-term debt (including amounts due within one year) at December 31, 2023 for the applicable Registrants:
At December 31, 2023
Southern Company(*)
Alabama
Power
Georgia
Power
Mississippi
Power
Southern Company
Gas
(in millions, except percentages)
Long-term variable interest rate exposure$5,290 $1,083 $1,939 $269 $500 
Weighted average interest rate on long-term variable interest rate exposure5.87 %4.75 %5.48 %5.39 %5.85 %
Impact on annualized interest expense of 100 basis point change in interest rates$53 $11 $19 $$
(*)Includes $1.4 billion of long-term variable interest rate exposure at the Southern Company parent entity.
The Registrants may enter into interest rate derivatives designated as hedges, which are intended to mitigate interest rate volatility related to forecasted debt financings and existing fixed and floating rate obligations. See Note 14 to the financial statements under "Interest Rate Derivatives" for additional information.
Southern Company and Southern Power had foreign currency denominated debt at December 31, 2023 and have each mitigated exposure to foreign currency exchange rate risk through the use of foreign currency swaps. See Note 14 to the financial statements under "Foreign Currency Derivatives" for additional information.
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Changes in fair value of energy-related derivative contracts for Southern Company and Southern Company Gas for the years ended December 31, 2023 and 2022 are provided in the table below. At December 31, 2023 and 2022, substantially all of the traditional electric operating companies' and certain of the natural gas distribution utilities' energy-related derivative contracts were designated as regulatory hedges and were related to the applicable company's fuel-hedging program.
Southern Company(a)
Southern Company Gas(a)
(in millions)
Contracts outstanding at December 31, 2021, assets (liabilities), net$174 $8 
Contracts realized or settled(327)10 
Current period changes(b)
142 (55)
Contracts outstanding at December 31, 2022, assets (liabilities), net$(11)$(37)
Contracts realized or settled207 33 
Current period changes(b)
(500)(45)
Contracts outstanding at December 31, 2023, assets (liabilities), net$(304)$(49)
(a)Excludes cash collateral held on deposit in broker margin accounts of $62 million, $41 million, and $3 million at December 31, 2023, 2022, and 2021, respectively, and immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
(b)The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
The net hedge volumes of energy-related derivative contracts for natural gas purchased (sold) at December 31, 2023 and 2022 for Southern Company and Southern Company Gas were as follows:
Southern CompanySouthern Company Gas
mmBtu Volume (in millions)
At December 31, 2023:
Commodity – Natural gas swaps109 — 
Commodity – Natural gas options339 102 
Total hedge volume448 102 
At December 31, 2022:
Commodity – Natural gas swaps217 — 
Commodity – Natural gas options214 93 
Total hedge volume431 93 
Southern Company Gas' derivative contracts are comprised of both long and short natural gas positions. A long position is a contract to purchase natural gas, and a short position is a contract to sell natural gas. The volumes presented above for Southern Company Gas represent the net of long natural gas positions of 112 million mmBtu and short natural gas positions of 10 millionmmBtu at December 31, 2023 and the net of long natural gas positions of 98 million mmBtu and short natural gas positions of 5 million mmBtu at December 31, 2022.
For the Southern Company system, the weighted average swap contract cost per mmBtu was approximately $0.76 per mmBtu below market prices at December 31, 2023 and was approximately $0.08 per mmBtu above market prices at December 31, 2022. The change in option fair value is primarily attributable to the volatility of the market and the underlying change in the natural gas price. Substantially all of the traditional electric operating companies' natural gas hedge gains and losses are recovered through their respective fuel cost recovery clauses.
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The Registrants use over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. In addition, Southern Company Gas uses exchange-traded market-observable contracts, which are categorized as Level 1. See Note 13 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts for Southern Company and Southern Company Gas at December 31, 2023 were as follows:
Fair Value Measurements of Contracts at
December 31, 2023
Total
Fair Value
Maturity
20242025 – 20262027 – 2028Thereafter
(in millions)
Southern Company
Level 1(a)
$(40)$(36)$(4)$— $— 
Level 2(b)
(264)(180)(87)
Southern Company total(c)
$(304)$(216)$(91)$$
Southern Company Gas
Level 1(a)
$(40)$(36)$(4)$— $— 
Level 2(b)
(9)(8)(1)— — 
Southern Company Gas total(c)
$(49)$(44)$(5)$— $— 
(a)Valued using NYMEX futures prices.
(b)Level 2 amounts for Southern Company Gas are valued using basis transactions that represent the cost to transport natural gas from a NYMEX delivery point to the contract delivery point. These transactions are based on quotes obtained either through electronic trading platforms or directly from brokers.
(c)Excludes cash collateral of $62 million as well as immaterial premium and associated intrinsic value associated with weather derivatives.
The Registrants are exposed to risk in the event of nonperformance by counterparties to energy-related and interest rate derivative contracts, as applicable. The Registrants only enter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P, or with counterparties who have posted collateral to cover potential credit exposure. Therefore, the Registrants do not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 14 to the financial statements.
Credit Risk
Southern Company (except as discussed herein), the traditional electric operating companies, and Southern Power are not exposed to any concentrations of credit risk. Southern Company Gas' exposure to concentrations of credit risk is discussed herein.
Southern Company Gas
Gas Distribution Operations
Concentration of credit risk occurs at Atlanta Gas Light for amounts billed for services and other costs to its customers, which consist of the 13 Marketers in Georgia. The credit risk exposure to the Marketers varies seasonally, with the lowest exposure in the non-peak summer months and the highest exposure in the peak winter months. Marketers are responsible for the retail sale of natural gas to end-use customers in Georgia. The provisions of Atlanta Gas Light's tariff allow Atlanta Gas Light to obtain credit security support in an amount equal to a minimum of two times a Marketer's highest month's estimated bill from Atlanta Gas Light. For 2023, the four largest Marketers based on customer count, which includes SouthStar, accounted for 18% of Southern Company Gas' operating revenues and 20% of operating revenues for Southern Company Gas' gas distribution operations segment.
Several factors are designed to mitigate Southern Company Gas' risks from the increased concentration of credit that has resulted from deregulation. In addition to the security support described above, Atlanta Gas Light bills intrastate delivery service to Marketers in advance rather than in arrears. Atlanta Gas Light accepts credit support in the form of cash deposits, letters of credit/surety bonds from acceptable issuers, and corporate guarantees from investment-grade entities. Southern Company Gas reviews the adequacy of credit support coverage, credit rating profiles of credit support providers, and payment status of each Marketer. Southern Company Gas believes that adequate policies and procedures are in place to properly quantify, manage, and report on Atlanta Gas Light's credit risk exposure to Marketers.
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Atlanta Gas Light also faces potential credit risk in connection with assignments of interstate pipeline transportation and storage capacity to Marketers. Although Atlanta Gas Light assigns this capacity to Marketers, in the event that a Marketer fails to pay the interstate pipelines for the capacity, the interstate pipelines would likely seek repayment from Atlanta Gas Light.
Gas Marketing Services
Southern Company Gas obtains credit scores for its firm residential and small commercial customers using a national credit reporting agency, enrolling only those customers that meet or exceed Southern Company Gas' credit threshold. Southern Company Gas considers potential interruptible and large commercial customers based on reviews of publicly available financial statements and commercially available credit reports. Prior to entering into a physical transaction, Southern Company Gas also assigns physical wholesale counterparties an internal credit rating and credit limit based on the counterparties' Moody's, S&P, and Fitch ratings, commercially available credit reports, and audited financial statements.
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Other Electric Revenues
Other electric revenues decreased $17increased $45 million, or 2.4%, and increased $41 million, or 6.2%6.0%, in 2017 and 2016, respectively,2023 as compared to the prior years.2022. The 2017 decrease was primarily due to a $15 million decrease in open access transmission tariff revenues, primarily as a result of the expiration of long-term transmission services contracts at Georgia Power. The 2016 increase was primarily due to a $14increases of $23 million increase in customer temporary facilities services revenues and a $12 million increase in outdoor lighting revenuessales at Georgia Power, $18 million resulting from receipts of liquidated damages associated with generation facility production guarantees and an arbitration award at Southern Power, $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs at Georgia Power, and $17 million in retail solar program fees at Georgia Power, partially offset by decreases of $25 million in cogeneration steam revenues associated with lower natural gas prices at Alabama Power and $14 million in rent revenues primarily attributableat Alabama Power.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 20172023 and the percent change from the prior year2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential47.1 (5.1)%(0.5)%
Commercial48.3 0.1 1.3 
Industrial48.6 (1.9)(1.9)
Other0.5 (7.2)(6.8)
Total retail144.5 (2.3)(0.4)%
Wholesale51.0 (9.4)
Total energy sales195.5 (4.3)%
 
Total
KWHs
 
Total KWH
Percent Change
 
Weather-Adjusted
Percent Change
 2017 2017 2016 2017 2016
 (in billions)        
Residential50.5
 (5.3)% 2.3 % (0.3)% 0.2 %
Commercial52.3
 (2.6) 0.4
 (0.9) (1.0)
Industrial52.8
 
 (2.1) 
 (2.2)
Other0.9
 (4.0) (1.7) (3.9) (1.7)
Total retail156.5
 (2.6) 0.2
 (0.4)% (1.0)%
Wholesale49.0
 32.4
 21.4
    
Total energy sales205.5
 3.9 % 3.6 %    
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in the applicable service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, changes in weather, and changes in the number of customers. RetailWeather-adjusted retail energy sales decreased 4.2 billion587 million KWHs in 20172023 as compared to the prior year. This decrease was2022. Weather-adjusted residential KWH sales decreased 0.5% primarily due to milder weather and decreased customer usage, partially offset by customer growth. Weather-adjusted residentialcommercial KWH sales decreasedincreased 1.3% primarily due to decreasedincreased customer usage resulting from an increase in penetration of
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


energy-efficient residential appliances and an increase in multi-family housing, partially offset by customer growth. Weather-adjusted commercial KWH sales decreased primarily due to decreased customer usage resulting from customer initiatives in energy savings and an ongoing migration to the electronic commerce business model, partially offset by customer growth. Industrial KWH energy sales were flatdecreased 1.9% primarily due to decreased salesdecreases in the paper, stone, clay,chemicals, forest products, and glass, transportation, and chemicals sectors, offset by increased sales in the primary metals and textiletextiles sectors. Additionally, Hurricane Irma negatively impacted customer usage for all customer classes.
Retail energy sales increased 261 million KWHs in 2016 as compared to the prior year. This increase was primarily due to warmer weather in the third quarter 2016 as compared to the corresponding period in 2015 and customer growth, partially offset by decreased customer usage. The decrease in industrial KWH energy sales was primarily due to decreased sales in the primary metals, chemicals, paper, pipeline, and stone, clay, and glass sectors. A strong dollar, low oil prices, and weak global economic conditions constrained growth in the industrial sector in 2016. Weather-adjusted commercial KWH sales decreased primarily due to decreased customer usage resulting from an increase in electronic commerce transactions and energy saving initiatives, partially offset by customer growth. Weather-adjusted residential KWH sales increased primarily due to customer growth, partially offset by decreased customer usage primarily resulting from an increase in multi-family housing and efficiency improvements in residential appliances and lighting. Household income, one of the primary drivers of residential customer usage, had modest growth in 2016.
See "Electric Operating Revenues" above for a discussion of significant changes in wholesale revenues related to changes in price and KWH sales.
Other Revenues
Other revenues increased $20$108 million, or 24.1%37.5%, in 20172023 as compared to the prior year.2022. The 2017 increase was primarily due to additional third party infrastructure services.
Other revenues increased $83increases of $54 million in 2016 as compared to the prior year. The 2016 increase was primarily due to revenues from certain non-regulatedpower delivery construction and maintenance projects at Georgia Power, $34 million in unregulated sales of products and services by the traditional electric operating companies that were reclassified as other revenues for consistency of presentation on a consolidated basis following the PowerSecure acquisition. In prior periods, these revenues were included in other income (expense), net.at Alabama Power, and $25 million associated with energy conservation projects at Georgia Power.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for the electric utilities. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, the electric utilities purchase a portion of their electricity needs from the wholesale market.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Details of the Southern Company system's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)(b)
184 186 
Total purchased power (in billions of KWHs)
18 25 
Sources of generation (percent)(a) —
Gas54 51 
Nuclear(b)
18 16 
Coal17 22 
Hydro3 
Wind, Solar, and Other8 
Cost of fuel, generated (in cents per net KWH) 
Gas(a)
2.77 5.29 
Nuclear(b)
0.76 0.72 
Coal4.33 3.67 
Average cost of fuel, generated (in cents per net KWH)(a)(b)
2.68 4.05 
Average cost of purchased power (in cents per net KWH)(c)
5.17 7.66 
 2017 2016 2015
Total generation (in billions of KWHs)
194
 188
 187
Total purchased power (in billions of KWHs)
20
 19
 13
Sources of generation (percent) —
     
Gas46
 46
 46
Coal30
 33
 34
Nuclear16
 16
 16
Hydro2
 2
 3
Other6
 3
 1
Cost of fuel, generated (in cents per net KWH) 
     
Gas2.79
 2.48
 2.60
Coal2.81
 3.04
 3.55
Nuclear0.79
 0.81
 0.79
Average cost of fuel, generated (in cents per net KWH)
2.44
 2.40
 2.64
Average cost of purchased power (in cents per net KWH)(*)
5.19
 4.81
 6.11
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(*)
(b)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(c)Average cost of purchased power includes fuel purchased by the Southern Company system for tolling agreements where power is generated by the provider.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


system for tolling agreements where power is generated by the provider.
In 2017,2023, total fuel and purchased power expenses were $5.3$5.2 billion, an increasea decrease of $152 million,$3.2 billion, or 3.0%37.7%, as compared to the prior year.2022. The increasedecrease was primarily the result of a $196 million increase$2.7 billion decrease in the average cost of fuel generated and purchased power primarily due to higher natural gas prices, partially offset byand a $44$513 million net decrease in the volume of KWHs generated and purchased.
In 2016, total fuel and purchased power expenses were $5.1 billion, a decrease of $284 million, or 5.3%, as compared to the prior year. The decrease was primarily the result of a $650 million decrease in the average cost of fuel and purchased power primarily due to lower coal and natural gas prices, partially offset by a $366 million increase in the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions at the traditional electric operating companies are generally offset by fuel revenues and do not have a significant impact on net income. See FUTURE EARNINGS POTENTIAL – "Regulatory MattersFuel Cost Recovery" hereinNote 2 to the financial statements for additional information. Fuel expenses incurred under Southern Power's PPAs are generally the responsibility of the counterparties and do not significantly impact net income.
Fuel
In 2017, fuel expense was $4.4 billion, an increase of $39 million, or 0.9%, as compared to the prior year. The increase was primarily due to a 12.5% increase in the average cost of natural gas per KWH generated and a 2.8% increase in the volume of KWHs generated by natural gas, partially offset by a 7.9% decrease in the volume of KWHs generated by coal and a 7.6% decrease in the average cost of coal per KWH generated.
In 2016,2023, fuel expense was $4.4 billion, a decrease of $389 million,$2.5 billion, or 8.2%36.1%, as compared to the prior year.2022. The decrease was primarily due to a 14.4% decrease in the average cost of coal per KWH generated, a 4.6%47.6% decrease in the average cost of natural gas per KWH generated and a 2.7%22.5% decrease in the volume of KWHs generated by coal, partially offset by an 18.2% decrease in the volume of KWHs generated by hydro, an 18.0% increase in the average cost of coal per KWH generated, a 3.5%10.8% increase in the volume of KWHs generated by nuclear, and a 6.9% increase in the volume of KWHs generated by natural gas.
Purchased Power
In 2017,2023, purchased power expense was $863$883 million, an increasea decrease of $113$710 million, or 15.1%44.6%, as compared to the prior year.2022. The increasedecrease was primarily due to a 7.9% increase in the average cost per KWH purchased, primarily as a result of higher natural gas prices, and a 5.0% increase in the volume of KWHs purchased.
In 2016, purchased power expense was $750 million, an increase of $105 million, or 16.3%, as compared to the prior year. The increase was primarily due to a 45.6% increase in the volume of KWHs purchased, partially offset by a 21.3%32.5% decrease in the average cost per KWH purchased primarily as a result ofdue to lower natural gas prices.prices and a 27.5% decrease in the volume of KWHs purchased.
Energy purchases will vary depending on demand for energy within the Southern Company system's electric service territory, the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, and the availability of the Southern Company system's generation.
Cost of Other Sales
Cost of other sales were $69increased $57 million, or 50.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $40 million from unregulated power delivery construction and $58maintenance projects at Georgia Power and $20 million in 2017 and 2016, respectively. These costs wereexpenses related to certain non-regulated sales ofunregulated products and services by the traditional electric operating companies that were reclassified as costat Alabama Power.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $183$550 million, or 4.0%10.5%, in 20172023 as compared to the prior year.2022. The decrease was primarily due to cost containmentreflects a decrease of $189 million associated with the reliability reserve accruals and modernization activities implementedreliability-related expenditures incurred at Georgia Power that contributed toAlabama Power. Excluding this decrease, there were decreases of $85$223 million in generation maintenance costs, $49 million in other employee compensation and benefits, $46 million in transmission and distribution overhead line maintenance, and $22 million in customer accounts, service, and sales costs. Other factors include a $40 million increase in gains from sales of assets at Georgia Power and a $34 million decrease in scheduled outage and maintenance costs at generation facilities. These decreases were partially offset by a $56 million increase associated with new facilities at Southern Power, a $37 million increase in transmission and distribution costs primarily due to vegetation management at Alabama Power, and $32.5 million resulting from the write-down of Gulf Power's ownership of Plant Scherer Unit 3 in accordance with a rate case settlement agreement approved by the Florida PSC on April 4, 2017 (2017 Rate Case Settlement Agreement).
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


Other operations and maintenance expenses increased $231 million, or 5.4%, in 2016 as compared to the prior year. The increase was primarily related to a $76 million increase in transmission and distribution expenses primarily related to overhead line maintenance, a $37$182 million decrease in gains from sales of assets atstorm damage recovery as authorized in Georgia Power, a $36Power's 2022 ARP, $91 million charge in connection with cost containment activities at Georgia Power,generation non-outage maintenance expenses and planned outages, and $50 million in employee compensation and benefit expenses, partially offset by an $86 million increase in technology infrastructure and application production costs and a $35 million increase at Southern Power associated with new solar and wind facilities placed in service in 2015 and 2016. Additionally, the increase was due to a $19$73 million increase in generation expensesenvironmental projects primarily relatedat Georgia Power. See Note 1 to environmental costs, a $19 million increase in business developmentthe financial statements under "Storm Damage and support expenses at Southern Power, and an $11 million increase in scheduled outage and maintenance costs at generation facilities, partially offset by a $41 million net decrease in employee compensation and benefits, including pension costs.
Production expenses and transmission and distribution expenses fluctuate from year to year due to variations in outage and maintenance schedules and normal changes in the cost of labor and materials.Reliability Reserves" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $224$836 million, or 10.0%27.6%, in 20172023 as compared to the prior year.2022. The increase reflects $203was primarily due to increases of $541 million related toand $190 million resulting from higher depreciation rates at Alabama Power and Georgia Power, respectively, and $79 million from additional plant in service at the traditional electric operating companies and Southern Power and a $13 million increase in amortization related to environmental compliance at Mississippi Power. The increase was partially offset by a $34 million increase in the reductions in depreciation authorized in Gulf Power's 2013 rate case settlement approved by the Florida PSC as compared to the corresponding period in 2016.
Depreciation and amortization increased $213 million, or 10.5%, in 2016 as compared to the prior year primarily due to additional plant in service at the traditional electric operating companies and Southern Power.
service. See Note 12 to the financial statements under "Regulatory Assets and Liabilities" and "Depreciation and Amortization""Alabama Power – Rate CNP Depreciation" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $24$34 million, or 2.3%3.0%, in 20172023 as compared to the prior year2022. The increase was primarily due to increases of $62 million in property taxes primarily at Georgia Power resulting from an increase in property taxes due to new facilities at Southern Power.
Taxes other than income taxes increased $44 million, or 4.4%, in 2016 as compared to the prior year primarily due to an increase in property taxes due to higher assessed value of property at the traditional electric operating companies, increasesand $14 million in state and municipal utility license tax basestaxes at Alabama Power, an increasepartially offset by a decrease of $40 million in payroll taxesmunicipal franchise fees resulting from lower retail revenues at Georgia Power, and an increase in franchise taxes at Mississippi Power.
Estimated Loss on Kemper IGCCPlant Vogtle Units 3 and 4
In 2017, 2016, and 2015,Georgia Power recorded pre-tax charges (credits) to income for the estimated probable lossesloss on the Kemper IGCC of $3.4 billion, $428Plant Vogtle Units 3 and 4 totaling $(68) million and $365$183 million, respectively, in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded at Southern Company. On June 28, 2017, Mississippi Power suspended the gasifier portion of the project and recorded a charge to earnings for the remaining $2.8 billion book value of the gasifier portion of the project. Priorreflect Georgia Power's revisions to the suspension, Mississippi Power recorded losses for revisionstotal project capital cost forecast to complete construction and start-up of estimated costs expected to be incurred on construction ofPlant Vogtle Units 3 and 4 and the Kemper IGCC in excess of the $2.88 billionrelated cost cap established by the Mississippi PSC, net of $245 million of the Initial DOE Grants and excluding the Cost Cap Exceptions.
recovery. See Note 32 to the financial statements under "Kemper County Energy Facility""Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
AFUDCAllowance for equity decreased $48funds used during construction increased $37 million, or 24.0%17.6%, in 20172023 as compared to the prior year2022. The increase was primarily dueassociated with an increase in capital expenditures subject to Mississippi Power's suspension of the Kemper IGCC project in June 2017.
AFUDC equity decreased $26 million, or 11.5%, in 2016 as compared to the prior year primarily due to environmental and generation projects being placed in service at AlabamaGeorgia Power and Gulf Power, partially offset by a higher AFUDC rate and an increase in Kemper County energy facility CWIP subjectcapital expenditures related to AFUDChydro production and Plant Barry Unit 8 construction at Mississippi Power prior to the suspension of the gasifier portion of the project.
Alabama Power. See Note 32 to the financial statements under "Kemper County Energy Facility""Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $80$207 million, or 8.6%19.4%, in 20172023 as compared to the prior year primarily due2022. The increase reflects approximately $120 million related to an increase inhigher interest rates and $96 million related to higher average outstanding long-term debt, primarily at Southern Power and Georgia Power, and a $37 million decrease in interest capitalized, primarily at Southern Power and Mississippi Power, partially offset by a net reduction of $36 million
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Southern Company and Subsidiary Companies 2017 Annual Report


following Mississippi Power's settlement with the IRS related to research and experimental deductions.borrowings. See Note 5 to the financial statements under "Unrecognized Tax Benefits" for additional information.
Interest expense, net of amounts capitalized increased $157 million, or 20.3%, in 2016 as compared to the prior year primarily due to an increase in interest expense at Southern Power related to additional debt issued primarily to fund its growth strategy and continuous construction program, increases in both the average outstanding long-term debt balance and the average interest rate at the traditional electric operating companies, and the May 2015 termination of an asset purchase agreement between Mississippi Power and Cooperative Energy and the resulting reversal of accrued interest on related deposits.
See Note 68 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net decreased $8increased $17 million, or 10.7%3.3%, in 20172023 as compared to the prior year2022 primarily due to increases in charitable donations. The change also includes an increase of $159 million in currency losses arising from a translation of euro-denominated fixed-rate notes into U.S. dollars, fully offset by an equal change in gains on the foreign currency hedges that were reclassified from accumulated OCI into earnings at Southern Power.
Other income (expense), net decreased $43 million, or 134.4%, in 2016 as compared to the prior year primarily due to the reclassification of revenues and costs associated with certain non-regulated sales of products and services by the traditional electric operating companies to other revenues and cost of other sales for consistency of presentation on a consolidated basis following the PowerSecure acquisition. The net amounts reclassified were $25 million. Also contributing to the decrease was an $8$48 million decrease in charitable donations primarily at Georgia Power, a $15 million increase in interest income, and a $14 million decrease in non-operating benefit-related expenses at Alabama Power, partially offset by a $42 million decrease in non-service cost-related retirement benefits income and a $13 million decrease in customer charges related to contributions in aid of construction and a $6 million decrease in wholesale operating fee revenue at Georgia Power.
Income Taxes
Income taxes decreased $1.0 billion, or 92.5%, in 2017 as compared to the prior year primarily due to $809 million in tax benefits related to estimated losses on the Kemper IGCC at Mississippi Power and $346 million in net tax benefits resulting from the Tax Reform Legislation.
Income taxes decreased $235 million, or 17.7%, in 2016 as compared to the prior year primarily due to increased federal income tax benefits related to ITCs for solar plants placed in service and PTCs from wind generation at Southern Power in 2016.
See Note 511 to the financial statements for additional information.
Income Taxes
Income taxes decreased $265 million, or 31.3%, in 2023 as compared to 2022. The decrease was primarily due to a $252 million increase in the flowback of certain excess deferred income taxes at Alabama Power, an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards at Georgia Power, generation of $35 million of advanced nuclear PTCs at Georgia Power, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward at Georgia Power, partially offset by a $145 million decrease in the flowback of certain excess deferred income taxes at Georgia Power that ended in 2022. See Note 10 to the financial statements for additional information.
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Net Loss Attributable to Noncontrolling Interests
Substantially all noncontrolling interests relate to renewable projects at Southern Power. Net loss attributable to noncontrolling interests increased $20 million, or 18.7%, in 2023 as compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to Southern Power's wind tax equity partners and $5 million in lower income allocations to Southern Power's equity partners, partially offset by $10 million in lower HLBV loss allocations to Southern Power's battery energy storage partners.
Gas Business
Southern Company Gas distributes natural gas through utilities in sevenfour states and is involved in several other complementary businesses including gas marketing services, wholesale gas services,pipeline investments and gas midstream operations.
On July 1, 2016, Southern Company Gas became a wholly-owned, direct subsidiary of Southern Company. Prior to the completion of the Merger, Southern Company and Southern Company Gas operated as separate companies. The condensed statements of income herein includes Southern Company Gas' results of operations since July 1, 2016. See Note 12 to the financial statements under "Southern CompanyMerger with Southern Company Gas" for additional information regarding the Merger, including certain pro forma results of operations.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


marketing services.
A condensed statement of income for the gas business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Income taxes211 31 
Net income$615 $43 
 Amount Increase (Decrease)
from Prior Year
 2017 2017
 (in millions)
Operating revenues$3,920
 $2,268
Cost of natural gas1,601
 988
Cost of other sales29
 19
Other operations and maintenance940
 417
Depreciation and amortization501
 263
Taxes other than income taxes184
 113
Total operating expenses3,255
 1,800
Operating income665
 468
Earnings from equity method investments106
 46
Interest expense, net of amounts capitalized200
 119
Other income (expense), net39
 25
Income taxes367
 291
Net income$243
 $129
The changes in the table above for Southern Company Gas reflect the 12-month period in 2017 compared to the six-month period following the Merger closing on July 1, 2016. Additionally, earnings from equity method investments include Southern Company Gas' acquisition of a 50% equity interest in Southern Natural Gas Company, L.L.C. (SNG) completed in September 2016. See Note 12 to the financial statements under "Southern Company Gas" for additional information on Southern Company Gas' investment in SNG.
Seasonality of Results
During the period from November through March when natural gas usage and operating revenues are generally higher (Heating Season), more customers are connected to Southern Company Gas' distribution systems and natural gas usage is higher in periods of colder weather. Occasionally in the summer, operating revenues are impacted due to peak usage by power generators in response to summer energy demands. Southern Company Gas' base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively equally over any given year. Thus, operating results can vary significantly from quarter to quarter as a result of seasonality. For 2017,2023, the percentage of operating revenues and net income generated during
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the Heating Season (January through March and November through December) were 67% and 73%, respectively. For 2022, the percentage of operating revenues and net income generated during the Heating Season (January through Marchwere 67% and November through December)66%, respectively.
Operating Revenues
Operating revenues in 2023 were 67.3% and 73.7%$4.7 billion, reflecting a $1.3 billion, or 21.1%, respectively. For July 1, 2016 through December 31, 2016, the percentagedecrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income generated during the Heating Season (November and December) were 67.1% and 96.5%, respectively. The 2017 net income generated during the Heating Season was significantly impacted by additional tax expense recorded in the fourth quarter resulting from the Tax Reform Legislation.natural gas distribution utilities. See FUTURE EARNINGS POTENTIAL – "Income Tax MattersFederal Tax Reform Legislation""Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Southern Company Gas hedged its exposure to warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. The remaining impacts of weather on earnings were immaterial.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, the natural gas distribution utilities rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at the natural gas distribution utilities represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, in 2023 compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses increased $18 million, or 1.5%, in 2023 compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
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Depreciation and Amortization
Depreciation and amortization increased $23 million, or 4.1%, in 2023 compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes decreased $20 million, or 7.1%, in 2023 compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $47 million, or 17.9%, in 2023 compared to 2022. The increase reflects approximately $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
Income taxes increased $31 million, or 17.2%, in 2023 compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Other Business Activities
Southern Company's other business activities primarily include the parent company (which does not allocate operating expenses to business units), products; PowerSecure, which provides distributed energy and services in the areas of distributed generation, energy efficiency,resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility infrastructure, and investments in leveraged lease projects and telecommunications. These businesses are classified in general categories and may comprise the following subsidiaries: PowerSecure is a provider of products and services in the areas of distributed generation, energy efficiency, and utility infrastructure;customers; Southern Company Holdings, Inc. (Southern Holdings)which invests in various projects, including leveraged lease projects; and Southern Linc, which provides digital wireless communications for use by the Southern Company and its subsidiary companiessystem and also markets these services to the public and provides fiber optics services within the Southeast.
On May 9, 2016, Southern Company acquired all of the outstanding stock of PowerSecure for an aggregate purchase price of $429 million. As a result, PowerSecure became a wholly-owned subsidiary of Southern Company. See Note 12 to the financial statements under "Southern CompanyAcquisition of PowerSecure" for additional information.
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Southern Company and Subsidiary Companies 2017 Annual Report


A condensed statement of incomeoperations for Southern Company's other business activities follows:
Amount 
Increase (Decrease)
from Prior Year
2017 2017 2016
(in millions)
20232023Increase (Decrease) from 2022
(in millions)(in millions)
Operating revenues$571
 $268
 $256
Cost of other sales415
 223
 192
Other operations and maintenance201
 7
 70
Depreciation and amortization52
 21
 17
Taxes other than income taxes3
 
 1
Impairment charges
Gain on dispositions, net
Total operating expenses671
 251
 280
Operating income (loss)(100) 17
 (24)
Earnings from equity method investments
Interest expense483
 178
 239
Other income (expense), net
Other income (expense), net
Other income (expense), net(3) 28
 (24)
Income taxes (benefit)(307) (91) (84)
Net income (loss)$(279) $(42) $(203)
Net loss
Operating Revenues
Southern Company's non-electric operatingOperating revenues for these other business activities increased $268$110 million, or 88.4%24.8%, in 20172023 as compared to the prior year. The increase was2022 primarily the resultdue to increases of the inclusion of$92 million related to distributed infrastructure projects at PowerSecure results for the 12-month period in 2017 compared to eight months in 2016. Non-electric operating revenues for these other business activities increased $256and $24 million or 544.7%, in 2016 as compared to the prior year. The increase was primarily related to revenues from products and services following the acquisition of PowerSecure.sales associated with commercial customers at Southern Linc.
Cost of Other Sales
Cost of other sales for these other business activities increased $223$87 million, or 32.5%, in 2023 as compared to 2022 primarily due to increases of $58 million related to distributed infrastructure projects at PowerSecure and $192$23 million in 2017 and 2016, respectively. These cost increases were primarily related to sales of products and services by PowerSecure, which was acquired on May 9, 2016.associated with commercial customers at Southern Linc.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses for these other business activities increased $7decreased $26 million, or 3.6%12.9%, in 20172023 as compared to the prior year. The increase was2022 primarily due to a $44decrease at the parent company related to cost containment efforts and lower director compensation expenses.
Impairment Charges
In 2022, a goodwill impairment charge of $119 million increasewas recorded at PowerSecure. See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information.
Gain on Dispositions, Net
In 2022, a $14 million gain was recorded at the parent company as a result of the inclusionearly termination of PowerSecure results for the 12-month period in 2017 compared to eight months in 2016, partially offset by a $35 million decrease in parent company expensestransition services agreement related to the Merger and the acquisition2019 sale of PowerSecure. Other operations and maintenance expenses for these other business activities increased $70 million, or 56.5%, in 2016 as compared to the prior year. The increase was primarily due to $47 million in operations and maintenance expenses following the acquisition of PowerSecure and an increase in parent company expenses of $16 million related to the Merger and the acquisition of PowerSecure.Gulf Power.
Interest Expense
Interest expense for these other business activities increased $178$171 million, or 58.4%24.7%, in 20172023 as compared to the prior year2022. The increase primarily dueresults from parent company financing activities and includes approximately $112 million related to an increase inhigher interest rates and $73 million related to higher average outstanding long-term debt at the parent company. Interest expense for these other business activities increased $239 million, or 362.1%, in 2016 as comparedborrowings. See Note 8 to the prior year primarily duefinancial statements for additional information.
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Other Income (Expense), Net
Other income (expense), net for these other business activities increased $28$39 million, or 70.9%, in 20172023 as compared to the prior year. The increase was2022 primarily due to $30a $29 million of expenses incurreddecrease in 2016 associated with bridge financing forcharitable donations and a $12 million increase in interest income, both primarily at the Merger. Other income (expense), net for these other business activities decreased $24 million in 2016 as comparedparent company. See Note 15 to the prior year. The decrease was primarily due to an increase of $16 million related to the bridge financingfinancial statements under "Southern Company" for the Merger.additional information.
Income Taxes (Benefit)
The income tax benefit for these other business activities increased $91$65 million, or 42.1%27.9%, in 20172023 as compared to 2022. The increase was primarily due to a $35 million tax benefit in 2023 related to a reversal of an uncertain tax position associated with the prior year2019 sale of Gulf Power and higher pre-tax losses, both at the parent company.
Alabama Power
Alabama Power's 2023 net income after dividends on preferred stock was $1.37 billion, representing a $30 million, or 2.2%, increase from 2022. The increase was primarily due to a decrease in income tax expense, an increase in Rate CNP Compliance revenues, a decrease in operations and maintenance expenses primarily related to the reliability reserve, and a lower Rate RSE customer refund accrual in 2023 compared to 2022. These increases to net income were offset by an increase in depreciation rates effective January 2023, a decrease in retail revenues associated with milder weather in Alabama Power's service territory in the first and second quarters of 2023 compared to the corresponding periods in 2022, and increases in capacity-related expenses and interest expense. See Note 2 to the financial statements under "Alabama Power" for additional information.
A condensed income statement for Alabama Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$7,050 $(767)
Fuel1,299 (541)
Purchased power504 (297)
Other operations and maintenance1,769 (166)
Depreciation and amortization1,401 526 
Taxes other than income taxes442 18 
Total operating expenses5,415 (460)
Operating income1,635 (307)
Allowance for equity funds used during construction82 12 
Interest expense, net of amounts capitalized425 43 
Other income (expense), net159 15 
Income taxes81 (342)
Net income1,370 19 
Dividends on preferred stock (11)
Net income after dividends on preferred stock$1,370 $30 
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Operating Revenues
Operating revenues for 2023 were $7.1 billion, reflecting a $767 million, or 9.8%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$6,470 
Estimated change resulting from —
Rates and pricing276 
Sales decline(33)
Weather(84)
Fuel and other cost recovery(470)
Retail — current year$6,159 $6,470 
Wholesale revenues —
Non-affiliates424 726 
Affiliates60 202 
Total wholesale revenues484 928 
Other operating revenues407 419 
Total operating revenues$7,050 $7,817 
Retail revenues decreased $311 million, or 4.8%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The decrease was primarily due to a decrease in fuel and other cost recovery, partially offset by an increase in revenues associated with rates and pricing primarily due to an increase in Rate CNP Compliance revenues and a lower Rate RSE customer refund accrual in 2023 compared to 2022.
See Note 2 to the financial statements under "Alabama Power – Rate ECR," " – Rate RSE," and " – Rate CNP Compliance" for additional information. See "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates include provisions to recognize the recovery of fuel costs, purchased power costs, PPAs certificated by the Alabama PSC, and costs associated with the NDR. Under these provisions, fuel and other cost recovery revenues generally equal fuel and other cost recovery expenses and do not affect net income. See Note 2 to the financial statements under "Alabama Power" for additional information.
Wholesale revenues from sales to non-affiliated utilities were as follows:
20232022
(in millions)
Capacity and other$163 $213 
Energy261 513 
Total non-affiliated$424 $726 
In 2023, wholesale revenues from sales to non-affiliates decreased $302 million, or 41.6%, as compared to 2022. The decrease reflects a 26.0% decrease in the volume of KWHs sold as a result of power sales agreements that ended in May 2023 and a 20.8% decrease in the price of energy primarily as a result of pre-tax earnings (losses) and net tax benefits relatedlower natural gas prices.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the Tax Reform Legislation. The income tax benefitcost of Alabama Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affect net income. Short-term opportunity energy sales are also included in wholesale energy sales to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Alabama Power's variable cost to produce the energy.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
In 2023, wholesale revenues from sales to affiliates decreased $142 million, or 70.3%, as compared to 2022. The revenue decrease reflects a 47.7% decrease in the price of energy due to lower natural gas prices and a 42.9% decrease in KWH sales due to lower customer demand as a result of milder weather in 2023.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales and purchases are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through Alabama Power's energy cost recovery clause.
In 2023, other operating revenues decreased $12 million, or 2.9%, as compared to 2022 primarily due to decreases of $25 million in cogeneration steam revenue associated with lower natural gas prices and $17 million in rent revenues, partially offset by a $34 million increase in unregulated sales of products and services.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change(*)
(in billions)
Residential17.4 (5.7)%(0.9)%
Commercial12.9 (1.2)0.4 
Industrial20.4 (2.8)(2.8)
Other0.1 (15.5)(15.5)
Total retail50.8 (3.4)(1.3)%
Wholesale
Non-affiliates9.3 (26.0)
Affiliates2.1 (42.9)
Total wholesale11.4 (29.9)
Total energy sales62.2 (9.7)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from the normal temperature conditions. Normal temperature conditions are defined as those experienced in Alabama Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. In 2023, weather-adjusted residential KWH sales decreased 0.9% primarily due to decreased customer usage. Weather-adjusted commercial KWH sales increased 0.4% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 2.8% as a result of a decrease in demand resulting from changes in production levels primarily in the chemicals and forest products sectors.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies related to changes in price and KWH sales.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, Alabama Power purchases a portion of its electricity needs from the wholesale market.
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Details of Alabama Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
54.558.3 
Total purchased power (in billions of KWHs)
10.811.6 
Sources of generation (percent)(a)
Coal35 46 
Gas31 24 
Nuclear27 22 
Hydro7 
Cost of fuel, generated (in cents per net KWH)
Coal3.46 3.39 
Gas(a)
2.99 5.12 
Nuclear0.69 0.67 
Average cost of fuel, generated (in cents per net KWH)(a)
2.50 3.19 
Average cost of purchased power (in cents per net KWH)(b)
4.98 8.00 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by Alabama Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $1.8 billion in 2023, a decrease of $838 million, or 31.7%, compared to 2022. The decrease was primarily due to a $674 million decrease in the average cost of fuel and purchased power and a $164 milliondecrease related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through Alabama Power's energy cost recovery clause. Alabama Power, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 2 to the financial statements under "Alabama Power – Rate ECR" for additional information.
Fuel
Fuel expense was $1.3 billion in 2023, a decrease of $541 million, or 29.4%, compared to 2022. The decrease was primarily due to a 41.6% decrease in the average cost of natural gas per KWH generated, which excludes tolling agreements, and a 29.1% decrease in the volume of KWHs generated by coal, partially offset by a 21.2% increase in the volume of KWHs generated by natural gas, an 18.9% decrease in the volume of KWHs generated by hydro facilities as a result of less rainfall in 2023, and a 13.6% increase in the volume of KWHs generated by nuclear.
Purchased Power Non-Affiliates
Purchased power expense from non-affiliates was $253 million in 2023, a decrease of $188 million, or 42.6%, compared to 2022. The decrease was primarily due to a 32.9% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 25.5% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company and Subsidiary Companies 2017 Annual Reportsystem.


for these other business activities increased $84 million, or 63.6%, in 2016Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the prior yearcost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power Affiliates
Purchased power expense from affiliates was $251 million in 2023, a decrease of $109 million, or 30.3%, compared to 2022. The decrease was primarily asdue to a result of changes51.4% decrease in pre-tax earnings (losses),the average cost per KWH purchased primarily due to lower natural gas prices, partially offset by state income tax benefits realizeda 43.4% increase in 2015.the volume of KWHs purchased due to the availability of lower cost gas generation in the Southern Company system.
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Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $166 million, or 8.6%, in 2023 as compared to 2022. The change was primarily due to a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred, as well as decreases of $33 million in transmission and distribution expenses and $21 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $30 million in technology infrastructure and application production costs and $25 million in expenses related to unregulated products and services, as well as a $14 million decrease in nuclear property insurance refunds. See FUTURE EARNINGS POTENTIALNote 2 to the financial statements under "Alabama Power"Income Tax MattersReliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $526 million, or 60.1%, in 2023 as compared to 2022 primarily due to an increase in depreciation rates effective in 2023. See Note 2 to the financial statements under "Alabama PowerFederal Tax Reform Legislation" hereinRate CNP Depreciation" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $12 million, or 17.1%, in 2023 as compared to 2022 primarily due to increases in capital expenditures related to hydro production and Plant Barry Unit 8 construction. See Note 52 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $43 million, or 11.3%, in 2023 as compared to 2022. The increase reflects approximately $30 million related to higher average outstanding borrowings and $20 million related to higher interest rates. See Note 8 to the financial statements for additional information.
EffectsOther Income (Expense), Net
Other income (expense), net increased $15 million, or 10.4%, in 2023 as compared to 2022 primarily due to a decrease in non-operating benefit-related expenses and an increase in interest income, partially offset by a decrease in non-service cost-related retirement benefits income. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $342 million, or 80.9%, in 2023 as compared to 2022 primarily due to a $252 million increase in the flowback of Inflationcertain excess deferred income taxes and an $84 million decrease due to lower pre-tax earnings. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" and Note 10to the financial statements for additional information.
Georgia Power
Georgia Power's 2023 net income was $2.1 billion, representing a $0.3 billion, or 14.7%, increase from the previous year. The increase was primarily due to lower non-fuel operations and maintenance costs, revenue reductions in 2022 as a result of Georgia Power exceeding its allowed retail return range, a $187 million decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, and an increase in other revenues, partially offset by a decrease in retail revenues associated with lower contributions from customers with variable demand-driven pricing and milder weather in 2023, as well as higher interest expense. Also contributing to the net income growth were the impacts of the 2022 ARP effective January 1, 2023, including increased retail rates, largely offset by higher depreciation and amortization. See Note 2 to the financial statements under "Georgia Power" for additional information.
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A condensed income statement for Georgia Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$10,118 $(1,466)
Fuel1,781 (705)
Purchased power1,281 (976)
Other operations and maintenance2,083 (266)
Depreciation and amortization1,681 251 
Taxes other than income taxes541 14 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total operating expenses7,299 (1,933)
Operating income2,819 467 
Allowance for equity funds used during construction165 25 
Interest expense, net of amounts capitalized626 141 
Other income (expense), net170 (6)
Income taxes (benefit)448 78 
Net income$2,080 $267 
Operating Revenues
Operating revenues for 2023 were $10.1 billion, reflecting a $1.5 billion, or 12.7%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$10,792 
Estimated change resulting from —
Rates and pricing172 
Sales decline(10)
Weather(141)
Fuel cost recovery(1,591)
Retail — current year$9,222 $10,792 
Wholesale revenues188 235 
Other operating revenues708 557 
Total operating revenues$10,118 $11,584 
Retail revenues decreased $1.6 billion, or 14.5%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing was primarily due to base tariff increases in accordance with the 2022 ARP and revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed retail ROE range, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in revenues recognized under the NCCR tariff. See Note 2 to the financial statements under "Georgia Power – Rate Plans" and " – Nuclear Construction" for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather in 2023.
Electric rates include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses and do not affect net income. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
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Wholesale revenues from power sales were as follows:
20232022
(in millions)
Capacity and other$66 $48 
Energy122 187 
Total$188 $235 
In 2023, wholesale revenues decreased $47 million, or 20.0%, as compared to 2022 largely due to an $81 million decrease related to the average cost per KWH sold due to lower Southern Company system fuel and purchased power costs, partially offset by a $21 million increase related to new capacity contracts and a $13 million increase related to the volume of KWH sales associated with higher market demand.
Wholesale revenues from sales to non-affiliates consist of PPAs and short-term opportunity sales. Wholesale revenues from PPAs have both capacity and energy components. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms and provide for recovery of fixed costs and a return on investment. Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Georgia Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above Georgia Power's variable cost of energy.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues increased $151 million, or 27.1%, as compared to 2022 primarily due to an increase of $105 million in unregulated sales associated with power delivery construction and maintenance, outdoor lighting, and energy conservation projects, a net increase of $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs, an increase of $17 million in retail solar program fees, and a $9 million increase in open access transmission tariff sales.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential27.6 (5.0)%(0.4)%
Commercial32.6 0.1 1.2 
Industrial23.5 (1.6)(1.4)
Other0.4 (4.7)(4.2)
Total retail84.1 (2.1)(0.1)%
Wholesale2.6 7.8 
Total energy sales86.7 (1.9)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Georgia Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. Weather-adjusted residential sales decreased 0.4% primarily due to decreased customer usage, largely offset by customer growth. Weather-adjusted commercial KWH sales increased 1.2% primarily due to customer growth. Weather-adjusted industrial KWH sales decreased
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1.4% primarily due to decreases in the textile, mining, and stone, clay, and glass sectors, partially offset by an increase in the paper sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for Georgia Power. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Georgia Power purchases a portion of its electricity needs from the wholesale market.
Details of Georgia Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
60.359.7 
Total purchased power (in billions of KWHs)
29.633.6 
Sources of generation (percent) —
Gas49 48 
Nuclear(a)
29 27 
Coal19 21 
Hydro and other3 
Cost of fuel, generated (in cents per net KWH)
Gas3.07 5.06 
Nuclear(a)
0.82 0.75 
Coal5.59 4.12 
Average cost of fuel, generated (in cents per net KWH)(a)
2.90 3.64 
Average cost of purchased power (in cents per net KWH)(b)
4.63 7.88 
(a)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(b)Average cost of purchased power includes fuel purchased by Georgia Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $3.1 billion in 2023, a decrease of $1.7 billion, or 35.4%, compared to 2022. The decrease was due to decreases of $1.4 billion related to the average cost of fuel and purchased power and $321 million related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through Georgia Power's fuel cost recovery mechanism. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Fuel
Fuel expense was $1.8 billion in 2023, a decrease of $0.7 billion, or 28.4%, compared to 2022. The decrease was primarily due to decreases of 39.3% in the average cost per KWH generated by natural gas and 8.9% in the volume of KWHs generated by coal, partially offset by increases of 35.7% in the average cost per KWH generated by coal, 9.3% in the average cost per KWH generated by nuclear, 8.5% in the volume of KWHs generated by nuclear, and 2.1% in the volume of KWHs generated by natural gas.
Purchased Power – Non-Affiliates
Purchased power expense from non-affiliates was $517 million in 2023, a decrease of $339 million, or 39.6%, compared to 2022. The decrease was primarily due to a decrease of 33.9% in the volume of KWHs purchased due to lower demand and the availability of lower cost generation in the Southern Company system and a decrease of 22.3% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
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Purchased Power – Affiliates
Purchased power expense from affiliates was $764 million in 2023, a decrease of $637 million, or 45.5%, compared to 2022. The decrease was primarily due to a decrease of 49.1% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $266 million, or 11.3%, in 2023 as compared to 2022. The decrease was primarily due to decreases of $182 million in storm damage recovery as authorized in the 2022 ARP, $178 million in transmission and distribution expenses primarily associated with line maintenance, $74 million in generation non-outage maintenance expenses, and $28 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $60 million from unregulated power delivery construction and maintenance and energy conservation projects, $59 million in generation environmental projects, $55 million in technology infrastructure and application production costs, and $28 million in planned generation outages. See Note 2 to the financial statements under "Georgia Power – Storm Damage Recovery" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $251 million, or 17.6%, in 2023 as compared to 2022 primarily due to increases of $190 million resulting from higher depreciation rates as authorized in the 2022 ARP and $75 million associated with additional plant in service, partially offset by a decrease of $15 million in amortization of regulatory assets related to the retirement of certain generating units that ended in 2022.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $14 million, or 2.7%, in 2023 as compared to 2022 primarily due to an increase of $56 million in property taxes primarily resulting from an increase in the assessed value of property, largely offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $25 million, or 17.9%, in 2023 as compared to 2022 primarily due to an increase in capital expenditures subject to AFUDC.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $141 million, or 29.1%, in 2023 as compared to 2022. The increase primarily reflects approximately $78 million related to higher interest rates and $76 million related to higher average outstanding borrowings, partially offset by the deferral of $14 million in financing costs related to Plant Vogtle Unit 3. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information. Also see Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
Other Income (Expense), Net
Other income (expense), net decreased $6 million, or 3.4%, in 2023 as compared to 2022 primarily due to decreases in non-service cost-related retirement benefits income and customer charges related to contributions in aid of construction, partially offset by a decrease in charitable donations. See Note 11 to the financial statements for additional information on Georgia Power's net periodic pension and other postretirement benefit costs.
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Income Taxes (Benefit)
Income taxes increased $78 million, or 21.1%, in 2023 as compared to 2022 primarily due to the flowback of $145 million of certain excess deferred income taxes that ended in 2022 and higher pre-tax earnings largely resulting from lower charges associated with the construction of Plant Vogtle Units 3 and 4, partially offset by an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards, generation of $35 million of advanced nuclear PTCs, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" and Note 10to the financial statements for additional information.
Mississippi Power
Mississippi Power's net income was $188 million in 2023 compared to $164 million in 2022. The increase was primarily due to an increase in affiliate wholesale capacity revenues, changes in power supply agreements, and a decrease in non-fuel operations and maintenance expenses, partially offset by an increase in interest expense.
A condensed income statement for Mississippi Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$1,474 $(220)
Fuel and purchased power538 (251)
Other operations and maintenance362 (14)
Depreciation and amortization190 9 
Taxes other than income taxes124  
Total operating expenses1,214 (256)
Operating income260 36 
Interest expense, net of amounts capitalized71 15 
Other income (expense), net35 2 
Income taxes36 (1)
Net income$188 $24 
Operating Revenues
Operating revenues for 2023 were $1.5 billion, reflecting a $220 million, or 13.0%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$935 
Estimated change resulting from —
Rates and pricing(11)
Sales growth11 
Weather(4)
Fuel and other cost recovery32 
Retail — current year$963 $935 
Wholesale revenues —
Non-affiliates272 252 
Affiliates200 460 
Total wholesale revenues472 712 
Other operating revenues39 47 
Total operating revenues$1,474 $1,694 
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Total retail revenues for 2023 increased $28 million, or 3.0%, compared to 2022 primarily due to higher recoverable fuel costs and an increase in customer usage, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and lower revenues associated with a tolling arrangement accounted for as a sales-type lease. See Notes 2 and 9 to the financial statements under "Mississippi Power" and "Lessor," respectively, for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates for Mississippi Power include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not affect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside Mississippi Power's service territory. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" for additional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
20232022
(in millions)
Capacity and other$21 $
Energy251 249 
Total non-affiliated$272 $252 
Wholesale revenues from sales to non-affiliates increased $20 million, or 7.9%, compared to 2022. The increase was primarily due to capacity revenues associated with new capacity contracts in 2023.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Mississippi Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. In addition, Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023. Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Mississippi Power's variable cost to produce the energy. See Note 2 under "Mississippi Power – Municipal and Rural Associations Tariff" for additional information.
Wholesale revenues from sales to affiliates decreased $260 million, or 56.5%, in 2023 compared to 2022. The decrease was primarily due to a $293 million decrease associated with lower natural gas prices, partially offset by a $23 million increase in capacity revenues resulting from availability of generation reserves and an increase in pricing and a $10 million increase associated with higher KWH sales.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. The energy portion of these transactions does not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues decreased $8 million, or 17.0%, as compared to 2022 primarily due to decreases of $5 million in unregulated sales associated with power delivery construction and maintenance projects and $3 million in open access transmission tariff revenues.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted Percent Change(*)
(in millions)
Residential2,092 (1.9)%0.7 %
Commercial2,815 7.0 7.1 
Industrial4,721 0.7 0.7 
Other28 (11.1)(11.1)
Total retail9,656 1.8 %2.5 %
Wholesale
Non-affiliated3,836 10.7 
Affiliated5,612 2.2 
Total wholesale9,448 5.5 
Total energy sales19,104 3.6 %
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Mississippi Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales increased in 2023 when compared to 2022. Weather-adjusted residential KWH sales increased 0.7% due to an increase in customer usage. Weather-adjusted commercial KWH sales increased 7.1% primarily due to customer growth. Industrial KWH sales increased 0.7% primarily due to an increase in the non-manufacturing sector, partially offset by a decrease in the chemicals sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Mississippi Power purchases a portion of its electricity needs from the wholesale market.
Details of Mississippi Power's generation and purchased power were as follows:
20232022
Total generation (in millions of KWHs)
18,789 18,303 
Total purchased power (in millions of KWHs)
524 617 
Sources of generation (percent) –
Gas92 90 
Coal8 10 
Cost of fuel, generated (in cents per net KWH) –
Gas2.68 4.34 
Coal5.46 4.13 
Average cost of fuel, generated (in cents per net KWH)
2.90 4.31 
Average cost of purchased power (in cents per net KWH)
4.27 6.91 
Fuel and purchased power expenses were $538 million in 2023, a decrease of $251 million, or 31.8%, as compared to 2022. The decrease was primarily due to a $266 million decrease related to the average cost of fuel and purchased power, partially offset by a $15 million net increase related to the volume of KWHs generated and purchased.
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Fuel and purchased power energy transactions do not have a significant impact on earnings since energy expenses are generally offset by energy revenues through Mississippi Power's fuel cost recovery clauses. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" and Note 1 to the financial statements under "Fuel Costs" for additional information.
Fuel expense decreased $230 million, or 30.8%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost of natural gas per KWH generated and a 20.3% decrease in the volume of KWHs generated by coal, partially offset by a 32.2% increase in the average cost of coal per KWHs generated and a 5.4% increase in the volume of KWHs generated by natural gas.
Purchased power expense decreased $21 million, or 49.9%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 15.1% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $14 million, or 3.7%, in 2023 compared to 2022. The decrease was primarily due to decreases of $14 million in reliability reserve accruals, $7 million in generation expenses, and $6 million in unregulated power delivery construction and maintenance projects, partially offset by increases of $5 million in storm reserve accruals and $2 million in certain employee compensation and benefit expenses. See Note 2 to the financial statements under "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $9 million, or 5.0%, in 2023 compared to 2022 primarily due to an increase in depreciation associated with additional plant in service.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $15 million, or 26.8%, in 2023 compared to 2022. The increase was primarily due to increases of approximately $10 million related to higher interest rates and $5 million related to higher average outstanding borrowings. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information.
Income Taxes
Income taxes decreased $1 million, or 2.7%, in 2023 compared to 2022 primarily due to a decrease of $7 million associated with the flowback of certain excess deferred income taxes associated with new PEP rates that became effective in April 2023, largely offset by an increase of $6 million associated with higher pre-tax earnings. See Note 2 to the financial statements under "Mississippi Power – Performance Evaluation Plan" and Note 10 to the financial statements for additional information.
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Southern Power
Net income attributable to Southern Power for 2023 was $357 million, a $3 million increase from 2022. The increase was primarily due to higher HLBV income associated with tax equity partnerships, an arbitration award received for losses previously incurred, a gain on the sale of spare parts, and receipts of liquidated damages and insurance proceeds related to generation facility production and equipment, as well as changes in state apportionment methodology related to tax legislation enacted by the State of Tennessee. These increases were largely offset by lower revenues driven by lower market prices of energy.
A condensed statement of income follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$2,189 $(1,180)
Fuel706 (908)
Purchased power116 (195)
Other operations and maintenance473 (9)
Depreciation and amortization504 (12)
Taxes other than income taxes51 2 
Loss on sales-type leases (1)
Gain on dispositions, net(20)(18)
Total operating expenses1,830 (1,141)
Operating income359 (39)
Interest expense, net of amounts capitalized129 (9)
Other income (expense), net12 5 
Income taxes (benefit)12 (8)
Net income230 (17)
Net loss attributable to noncontrolling interests(127)(20)
Net income attributable to Southern Power$357 $3 
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company power pool.
Natural Gas Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to operating income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of Southern Power's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have capacity revenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy generated from the respective facility and sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.
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See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.
Operating Revenues Details
Details of Southern Power's operating revenues were as follows:
20232022
(in millions)
PPA capacity revenues$471 $451 
PPA energy revenues1,227 2,121 
Total PPA revenues1,698 2,572 
Non-PPA revenues436 761 
Other revenues55 36 
Total operating revenues$2,189 $3,369 
Operating revenues for 2023 were $2.2 billion, a $1.2 billion, or 35.0% decrease from 2022. The change in operating revenues was primarily due to the following:
PPA capacity revenuesincreased $20 million, or 4.4%, primarily due to an increase associated with a change in rates from new and existing natural gas PPAs.
PPA energy revenues decreased $894 million, or 42.1%, primarily due to a $904 million decrease in sales under natural gas PPAs resulting from a $726 million decrease in the price of fuel and purchased power and a $178 million decrease in the volume of KWHs sold.
Non-PPA revenues decreased $325 million, or 42.7%, primarily due to a $650 million decrease in the market price of energy, partially offset by a $321 million increase in the volume of KWHs sold through short-term sales.
Other revenues increased $19 million, or 52.8%, primarily due to receipts of liquidated damages associated with generation facility production guarantees, an arbitration award received for losses previously incurred, and business interruption insurance proceeds for damaged generation equipment. See Note 3 to the financial statements under "General Litigation Matters – Southern Power" for additional information.
Fuel and Purchased Power Expenses
Details of Southern Power's generation and purchased power were as follows:
Total
KWHs
Total KWH % ChangeTotal
KWHs
20232022
(in billions of KWHs)
Generation4948
Purchased power33
Total generation and purchased power522.0%51
Total generation and purchased power (excluding solar, wind, fuel cells, and tolling agreements)
336.5%31
Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
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Details of Southern Power's fuel and purchased power expenses were as follows:
20232022
(in millions)
Fuel$706 $1,614 
Purchased power116 311 
Total fuel and purchased power expenses$822 $1,925 
In 2023, total fuel and purchased power expenses decreased $1.1 billion, or 57.3%, compared to 2022. Fuel expensedecreased $908 million, or 56.3%, primarily due to a $1.0 billion decrease associated with the average cost of fuel. Purchased power expense decreased $195 million, or 62.7%, primarily due to a $206 million decrease associated with the average cost of purchased power.
Gain on Dispositions, Net
In 2023, gain on dispositions, net increased $18 million compared to 2022 primarily due to a $16 million gain on the sale of spare parts in 2023.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized decreased $9 million, or 6.5%, compared to 2022. The decrease was primarily due to lower average outstanding borrowings.
Income Taxes (Benefit)
In 2023, income taxes decreased $8 million, or 40.0%, compared to 2022. The decrease was primarily due to a change in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in the second quarter 2023. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate," respectively, for additional information.
Net Loss Attributable to Noncontrolling Interests
In 2023, net loss attributable to noncontrolling interests increased $20 million, or 18.7%, compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to wind tax equity partners and $5 million in lower income allocations to equity partners, partially offset by $10 million in lower HLBV loss allocations to battery energy storage partners.
Southern Company Gas
Southern Company Gas has various regulatory mechanisms, such as weather and revenue normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of its utility's respective service territory. Southern Company Gas also utilizes weather hedges to limit the negative income impacts in the event of warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. Therefore, weather typically does not have a significant net income impact.
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas and bad debt expense, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing Southern Company Gas' annual results. Thus, Southern Company Gas' operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
Percent Generated During
Heating Season
Operating RevenuesNet
Income
202367 %73 %
202267 %66 %
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Net Income
Net income attributable to Southern Company Gas in 2023 was $615 million, an increase of $43 million, or 7.5%, compared to 2022. Net income increased primarily as a result of an impairment charge in 2022 related to the sale of natural gas storage facilities. The increase in net income was partially offset by a decrease of $29 million in net income at gas distribution operations primarily as a result of reduced revenue due to lower volumes sold, regulatory disallowances at Nicor Gas, and higher depreciation related to continued investment in infrastructure replacement programs, partially offset by lower cost of gas, and a $9 million decrease in net income at gas pipeline investments primarily as a result of higher expenses at SNG.
A condensed income statement for Southern Company Gas follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Earnings before income taxes826 74 
Income taxes211 31 
Net Income$615 $43 
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from
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customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Customer Count
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas distribution operations' and gas marketing services' customers are primarily located in Georgia and Illinois.
The following table provides the number of customers served by Southern Company Gas at December 31, 2023 and 2022:
20232022
(in thousands, except market share %)
Gas distribution operations4,374 4,358 
Gas marketing services
Energy customers665 622 
Market share of energy customers in Georgia30.0 %29.3 %
Southern Company Gas anticipates customer growth and uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at gas distribution operations represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
In 2023, cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
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Volumes of Natural Gas Sold
Southern Company Gas' natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas.
The following table details the volumes of natural gas sold during all periods presented:
2023 vs. 2022
20232022% Change
Gas distribution operations (mmBtu in millions)
Firm625 707 (11.6)%
Interruptible93 93  
Total718 800 (10.3)%
Gas marketing services (mmBtu in millions)
Firm:
Georgia33 35 (5.7)%
Other19 18 5.6 
Interruptible large commercial and industrial14 14  
Total66 67 (1.5)%
Other Operations and Maintenance Expenses
In 2023, other operations and maintenance expenses increased $18 million, or 1.5%, compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Depreciation and Amortization
In 2023, depreciation and amortization increased $23 million, or 4.1%, compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
In 2023, taxes other than income taxes decreased $20 million, or 7.1%, compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized increased $47 million, or 17.9%, compared to 2022. The increase reflects $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
In 2023, income taxes increased $31 million, or 17.2%, compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes
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related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Segment Information
20232022
Operating RevenuesOperating ExpensesNet Income (Loss)Operating RevenuesOperating ExpensesNet Income (Loss)
(in millions)(in millions)
Gas distribution operations$4,105 $3,301 $441 $5,267 $4,464 $470 
Gas pipeline investments32 10 98 32 11 107 
Gas marketing services548 418 91 638 505 94 
All other36 40 (15)55 190 (99)
Intercompany eliminations(19)(6) (30)(22)— 
Consolidated$4,702 $3,763 $615 $5,962 $5,148 $572 
Gas Distribution Operations
Gas distribution operations is the largest component of Southern Company Gas' business and is subject to regulation and oversight by regulatory agencies in each of the states it serves. These agencies approve natural gas rates designed to provide Southern Company Gas with the opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest expense, operations and maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, Southern Company Gas' second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. Southern Company Gas has various regulatory and other mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit its exposure to changes in customer consumption, including weather changes within typical ranges in its natural gas distribution utilities' service territories. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income decreased $29 million, or 6.2%, compared to 2022. Operating revenues decreased $1.2 billion primarily due to lower gas cost recovery and lower volumes sold, partially offset by rate increases and continued investment in infrastructure replacement. Gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas. Operating expenses decreased $1.2 billion primarily due to a $1.3 billion decrease in the cost of natural gas as a result of lower gas prices compared to 2022 and lower taxes other than income taxes, partially offset by $88 million related to the regulatory disallowances at Nicor Gas, higher depreciation resulting from additional assets placed in service, higher compensation and benefits expenses, and a $20 million increase related to energy service contracts. The decrease in operating expenses also includes costs passed through directly to customers, primarily related to bad debt expenses, energy efficiency programs, and revenue taxes. The decrease in net income also includes an increase of $46 million in interest expense, net of amounts capitalized primarily due to higher interest rates and higher average outstanding debt, partially offset by a $19 million decrease in income taxes primarily as a result of the tax benefit resulting from the regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Gas Pipeline Investments
Gas pipeline investments consists primarily of joint ventures in natural gas pipeline investments including SNG and Dalton Pipeline. In 2023, net income decreased $9 million compared to 2022. The decrease was primarily due to lower earnings at SNG resulting from higher expenses. See Note 7 to the financial statements under "Southern Company Gas" for additional information.
Gas Marketing Services
Gas marketing services provides energy-related products and services to natural gas markets and participants in customer choice programs that were approved in various states to increase competition. These programs allow customers to choose their natural gas supplier while the local distribution utility continues to provide distribution and transportation services. Gas marketing
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services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts.
In 2023, net income decreased $3 million, or 3.2%, compared to 2022. The decrease was due to a $90 million decrease in operating revenues primarily due to lower gas prices and the timing of unrealized hedge losses, largely offset by an $87 million decrease in operating expenses primarily related to a $106 million decrease in cost of gas, partially offset by higher compensation and benefits.
All Other
All other includes natural gas storage businesses, a renewable natural gas business, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the reportable segments and interest income (expense) associated with affiliate financing arrangements. All other included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income increased $84 million compared to 2022. The increase was primarily due to a decrease in operating expenses primarily related to pre-tax impairment charges in 2022 totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities, lower depreciation, lower cost of gas, and lower taxes other than income taxes, partially offset by a decrease in operating revenues of $19 million and an increase in income taxes. See Note 10 to the financial statements and Note 15 to the financial statements under "Southern Company Gas"for additional information.
FUTURE EARNINGS POTENTIAL
General
Prices for electric service provided by the traditional electric operating companies and natural gas distribution utilities are subject to rate regulation that is generally based onservice provided by the recovery of historical and projected costs. The effects of inflation can create an economic loss since the recovery of costs could be in dollars that have less purchasing power. Southern Power is party to long-term contracts reflecting market-based rates, including inflation expectations. Any adverse effect of inflation on Southern Company's results of operations has not been substantial in recent years.
FUTURE EARNINGS POTENTIAL
General
The four traditional electric operating companies operate as vertically integrated utilities providing electric service to customers within their service territories in the Southeast. The seven natural gas distribution utilities provide service to customers in their service territories in Illinois, Georgia, Virginia, New Jersey, Florida, Tennessee, and Maryland. Prices for electricity provided and natural gas distributed to retail customers are set by state PSCs or other applicable state regulatory agencies under cost-based regulatory principles. Retail rates and earnings are reviewed through various regulatory mechanisms and/or processes and may be adjusted periodically within certain limitations. Effectively operating pursuant to these regulatory mechanisms and/or processes and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the traditional electric operating companies and natural gas distribution utilities for the foreseeable future. Prices for wholesale electricity sales, and natural gas distribution, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Retail rates and earnings are reviewed and may be adjusted periodically within certain limitations. Southern Power continues to focus on long-term PPAs. See ACCOUNTING POLICIES"Application"Application of Critical Accounting Policies and EstimatesUtility Regulation"Regulation" herein and Note 32 to the financial statements for additional information about regulatory matters. As discussed further herein, in October 2017, a wholly-owned subsidiary of Southern Company Gas entered into agreements for the sale of the assets of two of its natural gas distribution utilities, Elizabethtown Gas and Elkton Gas, to South Jersey Industries, Inc.
TheEach Registrant's results of operations for the past three years are not necessarily indicative of Southern Company'sits future earnings potential. The level of Southern Company'sthe Registrants' future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Southern Company system'sRegistrants' primary businesses of selling electricity andand/or distributing natural gas. These factors includegas, as described further herein.
For the traditional electric operating companies' andcompanies, these factors include the natural gas distribution utilities' ability to maintain a constructive regulatory environmentenvironments that allowsallow for the timely recovery of prudently-incurred costs during a time of increasing costs, and limitedincluding those related to projected long-term demand growth, overstringent environmental standards, including CCR rules, safety, system reliability and resiliency, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants and expanding and improving the next several years.transmission and distribution systems; continued customer growth; and the trends of higher inflation and reduced electricity usage per customer, especially in residential and commercial markets. For Georgia Power, other major factors are completing construction and start-up of Plant Vogtle Units 3Unit 4 and 4 constructionmeeting the related cost and rate recovery are also major factors. In addition, the profitability of Southern Power's competitive wholesale business and successful additional investments in renewable and other energy projects are also major factors.schedule projections.
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018, which among other things, reduces the federal corporate income tax rate to 21% and changes rates of depreciation and the business interest deduction. See "Income Tax MattersFederal Tax Reform Legislation" and FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Notes 3 and 5 to the financial statements for additional information.
Future earnings for the electricity and natural gas businesses will be driven primarily by customer growth. Earnings in the electricity business will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, and higher multi-family home construction, all of which could contribute to a net reduction in customer usage.
Global and U.S. economic conditions continue to be affected by higher-than-expected inflation that arose from the COVID-19 pandemic and associated policy responses of governments and central banks. In response to elevated inflation levels, the U.S. Federal Reserve raised interest rates faster than any rate increase cycle in the last 40 years. The actions by the U.S. Federal Reserve have helped to slow the rate of inflation and curtail economic activity. Although target levels of inflation have yet to be achieved, the U.S. Federal Reserve has indicated its current intention to pause future rate increases and evaluate rate cuts in the near term. The shifting economic policy variables and weakening of historic relationships among economic activity, prices, and employment have increased the uncertainty of future levels of economic activity, which will directly impact future energy demand and operating costs. Weakening economic activity increases the risk of slowing or declining energy sales. See RESULTS OF OPERATIONS herein for information on energy sales in the Southern Company system's service territory during 2023.
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The level of future earnings for Southern Power's competitive wholesale electric business depends on numerous factors including the parameters of the wholesale market and the efficient operation of its wholesale generating assets; Southern Power's ability to execute its growth strategy through the development, construction, or acquisition of renewable facilities and other energy projects while containing costs; regulatory matters; customer creditworthiness; total electric generating capacity available in Southern Power's market areas; Southern Power's ability to successfully remarket capacity as current contracts expire; renewable portfolio standards; continued availability of federal and state ITCs and PTCs, which could be impacted by future tax legislation; transmission constraints; cost of generation from units within the Southern Company power pool; and operational limitations. See "Income Tax Matters" herein for information regarding the IRA's expansion of the availability of federal ITCs and PTCs. Also see Notes 10 and 15 to the financial statements for additional information.
The level of future earnings for Southern Company Gas' primary business of distributing natural gas and its complementary businesses in the gas pipeline investments and gas marketing services sectors depends on numerous factors. These factors include the natural gas distribution utilities' ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs, including those related to projected long-term demand growth, safety, system reliability and resiliency, natural gas, and capital expenditures, including expanding and improving the natural gas distribution systems; the completion and subsequent operation of ongoing infrastructure and other construction projects; customer creditworthiness; and certain policies to limit the use of natural gas, such as the potential in Illinois and across certain other parts of the U.S. for state or municipal bans on the use of natural gas or policies designed to promote electrification. The volatility of natural gas prices has an impact on Southern Company Gas' customer rates, its long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services business to capture value from locational and seasonal spreads. Additionally, changes in commodity prices, primarily driven by tight gas supplies, geopolitical events, and diminished gas production, subject a portion of Southern Company Gas' operations to earnings variability and may result in higher natural gas prices. Additional economic factors may contribute to this environment. The demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis. Alternatively, a significant drop in oil and natural gas prices could lead to a consolidation of natural gas producers or reduced levels of natural gas production.
Earnings for both the electricity and natural gas businesses are subject to a variety of other factors. These factors include weather, competition,weather; competition; developing new and maintaining existing energy contracts and associated load requirements with other utilities and other wholesale customers,customers; customer energy conservation practiced by customers,practices; the use of alternative energy sources by customers, thecustomers; government incentives to reduce overall energy usage; fuel, labor, and material prices in an environment of electricityheightened inflation and natural gas,material and labor supply chain disruptions; and the price elasticity of demand, and the rate of economic growth or decline in the service territory. In addition, the level of future earnings for the wholesale electric business also depends on numerous factors including regulatory matters, creditworthiness of customers, total electric generating capacity available and related costs, future acquisitions and construction of electric generating facilities, the impact of tax credits from renewable energy projects, and the successful remarketing of capacity as current contracts expire.demand. Demand for electricity and natural gas in the Registrants' service territories is primarily driven by the pace of economic growth or decline that may be affected by changes in regional and global economic conditions, which may impact future earnings. In addition,
Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the volatilityFERC. The contracts with these wholesale customers represented 14.0% of natural gas prices has a significant impact on the natural gas distribution utilities' customer rates, long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services and wholesale gas services businesses to capture value from locational and
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Southern Company and Subsidiary Companies 2017 Annual Report


seasonal spreads. Additionally, changesMississippi Power's total operating revenues in commodity prices subject a significant portion of Southern Company Gas' operations to earnings variability.2023.
As part of its ongoing effort to adapt to changing market conditions, Southern Company continues to evaluate and consider a wide array of potential business strategies. These strategies may include business combinations, partnerships, and acquisitions involving other utility or non-utility businesses or properties, disposition of, or the sale of interests in, certain assets or businesses, internal restructuring, or some combination thereof. Furthermore, Southern Company may engage in new business ventures that arise from competitive and regulatory changes in the utility industry. Pursuit of any of the above strategies, or any combination thereof, may significantly affect the business operations, risks, and financial condition of Southern Company. In addition, Southern Power and Southern Company Gas regularly consider and evaluate joint development arrangements as well as acquisitions and dispositions of businesses and assets as part of their business strategies. See Note 1215 to the financial statements for additional information regarding Southern Company's recent acquisition and disposition activities.information.
On October 15, 2017, a wholly-owned subsidiary of Southern Company Gas entered into agreements for the sale of the assets of two of its natural gas distribution utilities, Elizabethtown Gas and Elkton Gas, to South Jersey Industries, Inc. for a total cash purchase price of $1.7 billion. As of December 31, 2017, the net book value of the assets to be disposed of in the sale was approximately $1.3 billion, which includes approximately $0.5 billion of goodwill. The goodwill is not deductible for tax purposes and, as a result, a deferred tax liability has not yet been provided. Through the completion of the asset sales, Southern Company Gas intends to invest less than $0.1 billion in capital additions required for ordinary business operations of these assets. The completion of each asset sale is subject to the satisfaction or waiver of certain conditions, including, among other customary closing conditions, the receipt of required regulatory approvals, including the FERC, the Federal Communications Commission, the New Jersey BPU, and, with respect to the sale of Elkton Gas, the Maryland PSC. Southern Company Gas and South Jersey Industries, Inc. made joint filings on December 22, 2017 and January 16, 2018 with the New Jersey BPU and the Maryland PSC, respectively, requesting regulatory approval. The asset sales are expected to be completed by the end of the third quarter 2018.
In addition, Southern Power is pursuing the sale of a 33% equity interest in a newly-formed holding company that owns substantially all of Southern Power's solar assets, which, if successful, is expected to close in the middle of 2018.
The ultimate outcome of these matters cannot be determined at this time.
Environmental Matters
The Southern Company system's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, avian and other wildlife and habitat protection, ofand other natural resources. The Southern Company system maintains a comprehensive environmental compliance strategyand GHG strategies to assess both current and upcoming requirements and compliance costs associated with these environmental laws and regulations. The costs, including capital expendituresNew or revised environmental laws and regulations could further affect many areas of operations and maintenancefor the Subsidiary Registrants. The costs required to comply with environmental laws and regulations and to achieve stated goals, including capital expenditures, operations and maintenance costs, and costs reflected in ARO liabilities, may impact future electric generating unit retirement and replacement decisions (which are generally subject to approval from the traditional electric operating companies' respective state PSCs), results of operations, cash flows, andand/or financial condition. ComplianceRelated costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, and adding or changing fuel sources for certain existing
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units, as well as related upgrades to the Southern Company system's transmission system.and distribution (electric and natural gas) systems. A major portion of these compliance costs areis expected to be recovered through retail and wholesale rates, including existing ratemaking and billing provisions. The ultimate impact of the environmental laws and regulations and the GHG goals discussed belowherein cannot be determined at this time and will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, andfuel prices, the outcome of pending and/or future legal challenges.
New or revised environmental lawschallenges and regulations could affect many areas of the traditional electric operating companies', Southern Power's,regulatory matters, and the natural gas distribution utilities' operations. The impact of any such changes cannot be determined at this time. Environmental complianceability to continue recovering the related costs, could affect earnings if such costs cannot continue to be fully recovered inthrough rates on a timely basis for the traditional electric operating companies and the natural gas distribution utilities and/or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.
Alabama Power and Mississippi Power recover environmental compliance costs through separate mechanisms, Rate CNP Compliance and the ECO Plan, respectively. Georgia Power's base rates include an ECCR tariff that allows for the recovery of environmental compliance costs. The natural gas distribution utilities of Southern Company Gas generally recover environmental remediation expenditures through rate mechanisms approved by their applicable state regulatory agencies. See Notes 2 and 3 to the financial statements for additional information.
Southern Power's PPAs generally contain provisions that permit charging the counterparty for some of the new costs incurred as a result of changes in environmental laws and regulations. Since Southern Power's units are generally newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and/or operating any type of existing or future facility. The impact of such laws, regulations, and other considerations on Southern Power and subsequent recovery through PPA provisions cannot be determined at this time.
Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity and natural gas, which could negatively affect results of operations, cash flows, andand/or financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affect their demand for electricity and natural gas.
The Southern Company system's commitment to the environment has been demonstrated in many ways, including participating in partnerships resulting in approximately $126 million of funding that has restored or enhanced more than 1.7 million acres of habitat since 2003; the removal of more than 15 million pounds of trash and debris from waterways through the Renew Our Rivers program; a 21% reduction in surface water withdrawal from 2015 to 2016; reductions in SO2 and NOX air emissions of 95% and 85%, respectively, since 1990; the reduction of mercury air emissions of over 90% since 2005; and the Southern Company system's changing energy mix.
Through 2017, the traditional electric operating companies have invested approximately $12.9 billion in environmental capital retrofit projects to comply with environmental requirements, with annual totals of approximately $0.9 billion, $0.5 billion, and
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$0.9 billion for 2017, 2016, and 2015, respectively. Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, estimated capital expenditures through 2028 based on the current environmental compliance strategy for the Southern Company system's current compliance strategy estimates capital expenditures of $2.8 billion from 2018 through 2022, with annual totals of approximately $1.1 billion, $0.3 billion, $0.4 billion, $0.5 billion,system and $0.5 billion for 2018, 2019, 2020, 2021, and 2022, respectively. the traditional electric operating companies are as follows:
20242025202620272028Total
(in millions)
Southern Company$150 $141 $112 $92 $30 $525 
Alabama Power45 47 40 35 19 186 
Georgia Power92 80 60 32 10 274 
Mississippi Power13 13 12 26 65 
These estimates do not include any potential compliance costs associated with thepotential regulation of CO2GHG emissions from fossil fuel-fired electric generating units.or the proposed ELG Supplemental Rule. See "Environmental Laws and Regulations– Greenhouse Gases" and "Global Climate Issues"– Water Quality" herein for additional information. The Southern Company system also anticipates substantial expenditures associated with ash pond closure and ground watergroundwater monitoring under the Disposal of Coal Combustion Residuals from Electric Utilities rule (CCR Rule),CCR Rule and related state rules, which are reflected in the Company'sapplicable Registrants' ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations""Cash Requirements" herein and Note 16 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
Environmental Laws and Regulations
Air Quality
TheSince 1990, the Southern Company system reduced SO2 and NOX air emissions by 99% and 92%, respectively, through 2022. Since 2005, the Southern Company system reduced mercury air emissions by 97% through 2022.
On February 13, 2023, the EPA has setpublished a final rule disapproving 19 state implementation plans (SIPs), including the States of Alabama and Mississippi, under the interstate transport (good neighbor) provisions of the Clean Air Act for the 2015 Ozone National Ambient Air Quality Standards (NAAQS) for six air pollutants (carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter,. On March 14, 2023 and SO2), which it reviews and revises periodically. Revisions to these standards can require additional emission controls, improvements in control efficiency, or fuel changes which can result in increased compliance and operational costs. NAAQS requirements can also adversely affect the siting of new facilities. In 2015, the EPA published a more stringent eight-hour ozone NAAQS. The EPA plans to complete designations for this rule by no later than April 30, 2018 and intends to designate an eight-county area within metropolitan Atlanta as nonattainment. No other areas within the Southern Company system's electric service territory have been or are anticipated to be designated nonattainment under the 2015 ozone NAAQS. In 2010, the EPA revised the NAAQS for SO2, establishing a new one-hour standard, and is completing designations in multiple phases. The EPA has issued several rounds of area designations and no areas in the vicinity of Southern Company system-owned SO2 sources have been designated nonattainment under the 2010 one-hour SO2 NAAQS. However, final eight-hour ozone and SO2 one-hour designations for certain areas are still pending and, if other areas are designated as nonattainment in the future, increased compliance costs could result.
In 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) and its NOX annual, NOX seasonal, and SO2 annual programs. CSAPR is an emissions trading program that addresses the impacts of the interstate transport of SO2 and NOX emissions from fossil fuel-fired power plants located in upwind states in the eastern half of the U.S. on air quality in downwind states. The Southern Company system has fossil fuel-fired generation in several states subject to these requirements. In October 2016, the EPA published a final rule that revised the CSAPR seasonal NOX program, establishing more stringent NOX emissions budgets in Alabama, Mississippi, and Texas. The EPA also removed North Carolina from the CSAPR NOX seasonal program and completely removed Florida from all CSAPR programs. Georgia's seasonal NOX budget remains unchanged. The outcome of ongoing CSAPR litigation, to which Mississippi Power is a party, could have an impact onMarch 15, 2023, the State of Mississippi's allowance allocations underMississippi and Mississippi Power, respectively, challenged the CSAPR seasonal NOX program. Increases in either future fossil fuel-fired generation or the cost of CSAPR allowances could have a negative financial impact on results of operations for Southern Company.
The EPA finalized regional haze regulations in 2005 and 2017. These regulations require states, tribal governments, and various federal agencies to develop and implement plans to reduce pollutants that impair visibility and demonstrate reasonable progress toward the goal of restoring natural visibility conditions in certain areas, including national parks and wilderness areas. States must submit a revised state implementation plan (SIP) to the EPA by July 31, 2021, demonstrating reasonable progress towards achieving visibility improvement goals. State implementation of reasonable progress could require further reductions in SO2 or NOX emissions, which could result in increased compliance costs.
In 2015, the EPA published a final rule requiring certain states (including Alabama, Florida, Georgia, Mississippi, North Carolina, and Texas) to revise or remove the provisions of their SIPs regulating excess emissions at industrial facilities, including electric generating facilities, during periods of startup, shut-down, or malfunction (SSM). The state excess emission rules provide necessary operational flexibility to affected units during periods of SSM and, if removed, could affect unit availability and result in increased operations and maintenance costs for the Southern Company system. The EPA has not yet responded to the SIP revisions proposed by states within the Southern Company system's traditional electric service territory.
Water Quality
In 2014, the EPA finalized requirements under Section 316(b)EPA's disapproval of the Clean Water Act (CWA) to regulate cooling water intake structures at existing power plants and manufacturing facilitiesMississippi SIP in order to minimize their effects on fish and other aquatic life. The regulation requires plant-specific studies to determine applicable measures to protect organisms that either get caught on the
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intake screens (impingement) or are drawn into the cooling system (entrainment). The ultimate impact of this rule will depend on the outcome of these plant-specific studies and any additional protective measures required to be incorporated into each plant's National Pollutant Discharge Elimination System (NPDES) permit based on site-specific factors.
In 2015, the EPA finalized the steam electric effluent limitations guidelines (ELG) rule that set national standards for wastewater discharges from steam electric generating units. The rule prohibits effluent discharges of certain wastestreams and imposes stringent arsenic, mercury, selenium, and nitrate/nitrite limits on scrubber wastewater discharges. The revised technology-based limits and compliance dates may require extensive modifications to existing ash and wastewater management systems or the installation and operation of new ash and wastewater management systems. Compliance with the ELG rule is expected to require capital expenditures and increased operational costs primarily affecting the traditional electric operating companies' coal-fired electric generation. Compliance applicability dates range from November 1, 2018 to December 31, 2023 with state environmental agencies incorporating specific applicability dates in the NPDES permitting process based on information provided for each waste stream. The EPA has committed to a new rulemaking that could potentially revise the limitations and applicability dates of the ELG rule. The EPA expects to finalize this rulemaking in 2020.
In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) jointly published a final rule that revised the regulatory definition of waters of the United States (WOTUS) for all CWA programs. The rule significantly expanded the scope of federal jurisdiction over waterbodies (such as rivers, streams, and canals), which could impact new generation projects and permitting and reporting requirements associated with the installation, expansion, and maintenance of transmission, distribution, and pipeline projects. On July 27, 2017, the EPA and the Corps proposed to rescind the 2015 WOTUS rule. The WOTUS rule has been stayed by the U.S. Court of Appeals for the Sixth Circuit since late 2015, but on January 22, 2018,
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Fifth Circuit. On June 8, 2023, the U.S. Supreme Court determined thatof Appeals for the Fifth Circuit stayed the EPA's disapproval of the Mississippi SIP, pending appeal. On April 13, 2023 and April 14, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the EPA's disapproval of the Alabama SIP in the U.S. Court of Appeals for the Eleventh Circuit. On August 17, 2023, the U.S. Court of Appeals for the Eleventh Circuit stayed the EPA's disapproval of the Alabama SIP, pending appeal.
On June 5, 2023, the EPA published the 2015 Ozone NAAQS Good Neighbor federal district courtsimplementation plan (FIP), which requires reductions in NOX emissions from sources in 23 states, including Alabama and Mississippi, to assure those states satisfy their Clean Air Act good neighbor obligations for the 2015 Ozone NAAQS. Georgia and North Carolina have jurisdiction overapproved interstate transport SIPs addressing the pending challenges2015 Ozone NAAQS and are not subject to thethis rule. On February 6, 2018,June 16, 2023 and June 27, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the FIP for Mississippi in the U.S. Court of Appeals for the Fifth Circuit. On August 4, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the FIP for Alabama in the U.S. Court of Appeals for the Eleventh Circuit. Both cases are being held in abeyance pending resolution of the Mississippi SIP disapproval and Alabama SIP disapproval cases, respectively.
In July and September 2023, the EPA published an Interim Final Rule and an updated Interim Final Rule that stays the Corps published a final rule delaying implementation of the FIPs for states with judicially stayed SIP disapprovals, including Mississippi and Alabama, respectively. The Interim Final Rule revises the existing regulations to maintain currently applicable trading programs for those states.
The ultimate impact of the rule and associated legal matters cannot be determined at this time; however, implementation of the FIPs will likely result in increased compliance costs for the traditional electric operating companies.
Water Quality
In 2020, the EPA published the final steam electric ELG reconsideration rule (ELG Reconsideration Rule), a reconsideration of the 2015 WOTUSELG rule's limits on bottom ash transport water and flue gas desulfurization wastewater that extended the latest applicability date for both discharges to December 31, 2025. The ELG Reconsideration Rule also updated the voluntary incentive program and provided new subcategories for low utilization electric generating units and electric generating units that will permanently cease coal combustion by 2028. On March 29, 2023, the EPA published a proposed ELG Supplemental Rule revising certain effluent limits of the 2020 and 2015 ELG rules. The proposal imposes more stringent requirements for flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate to be met no later than December 31, 2029. The EPA is also proposing that a limited number of facilities already achieving compliance with the 2020 ELG Reconsideration Rule be allowed to elect retirement or repowering by December 31, 2032 as opposed to meeting the new more stringent requirements. The proposal maintains the 2020 ELG Reconsideration Rule's permanent cessation of coal combustion subcategory allowing units to continue to operate until the end of 2028 without having to install additional technologies. The proposal also maintains the Voluntary Incentive Program (VIP) subcategory, which allows units to comply with VIP limits by December 31, 2028. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
As required by the ELG Reconsideration Rule, in 2021, Alabama Power and Georgia Power each submitted initial notices of planned participation (NOPP) for applicable units seeking to 2020.qualify for these cessation of coal combustion or VIP subcategories that require compliance by December 31, 2028.
Alabama Power submitted its NOPP to the Alabama Department of Environmental Management (ADEM) indicating plans to retire Plant Barry Unit 5 (700 MWs) and to cease using coal and begin operating solely on natural gas at Plant Barry Unit 4 (350 MWs) and Plant Gaston Unit 5 (880 MWs). Alabama Power, as agent for SEGCO, indicated plans to retire Plant Gaston Units 1 through 4 (1,000 MWs). However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. The NOPP submittals are subject to the review of the ADEM. Plant Barry Unit 4 ceased using coal and began to operate solely on natural gas in December 2022. See Notes 2 and 7 to the financial statements under "Georgia Power – Integrated Resource Plans" and "SEGCO," respectively, for additional information.
The remaining assets for which Alabama Power has indicated retirement, due to early closure or repowering of the unit to natural gas, have net book values totaling approximately $1.2 billion (excluding capitalized asset retirement costs which are recovered through Rate CNP Compliance) at December 31, 2023. Based on an Alabama PSC order, Alabama Power is authorized to establish a regulatory asset to record the unrecovered investment costs, including the plant asset balance and the site removal and closure costs, associated with unit retirements caused by environmental regulations (Environmental Accounting Order). Under the Environmental Accounting Order, the regulatory asset would be amortized and recovered over an affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance. See Note 2 to the financial statements under "Alabama Power – Rate CNP Compliance" and " – Environmental Accounting Order" for additional information.
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Georgia Power submitted its NOPP to the Georgia Environmental Protection Division (EPD) indicating plans to retire Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership), which occurred in August 2022, Plant Bowen Units 1 and 2 (1,400 MWs), and Plant Scherer Unit 3 (614 MWs based on 75% ownership) on or before the compliance date of December 31, 2028. Georgia Power also submitted a NOPP indicating plans to pursue compliance with the ELG Reconsideration Rule for Plant Scherer Units 1 and 2 (137 MWs based on 8.4% ownership) through the voluntary incentive program by no later than December 31, 2028. Georgia Power intends to comply with the ELG Rules for Plant Bowen Units 3 and 4 through the generally applicable requirements by December 31, 2025; therefore, no NOPP submission was required for these units. The NOPP submittals and generally applicable requirements are subject to the review of the Georgia EPD and decisions related to retirement or continued operation of units are subject to Georgia PSC approval. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the management and disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (CCR units)(ash ponds) at active electric generating power plants. The CCR Rule requires CCR unitslandfills and ash ponds to be evaluated against a set of performance criteria and potentially closed if minimumcertain criteria are not met. Closure of existing CCR units could requirelandfills and ash ponds requires installation of equipment and infrastructure to manage CCR in accordance with the CCR Rule. In addition to the federal CCR Rule, the States of Alabama and Georgia finalized state regulations regarding the management and disposal of CCR within their respective states. In 2019, the State of Georgia received partial approval from the EPA for its state CCR permitting program, which has broader applicability than the federal rule. The State of Mississippi has not developed a state CCR permit program.
On August 14, 2023, the EPA published a proposal to deny the ADEM's CCR permit program application. Alabama Power's permits to close its CCR facilities remain valid under state law. In the absence of an EPA-approved state permit program, CCR facilities in Alabama will remain subject to both the federal and state CCR rules.
The Holistic Approach to Closure: Part A rule, finalized in 2020, revised the deadline to stop sending CCR and non-CCR wastes to unlined surface impoundments to April 11, 2021 and established a process for the EPA to approve extensions to the deadline. The traditional electric operating companies stopped sending CCR and non-CCR wastes to their unlined impoundments prior to April 11, 2021 and, therefore, did not submit requests for extensions. Beginning in January 2022, the EPA issued numerous Part A determinations that state its current positions on a variety of CCR Rule compliance requirements, such as criteria for groundwater corrective action and CCR unit closure. The traditional electric operating companies are working with state regulatory agencies to determine whether the EPA's current positions may impact closure and groundwater monitoring plans.
In April 2022, the Utilities Solid Waste Activities Group and a group of generating facility operators filed petitions for review in the U.S. Court of Appeals for the D.C. Circuit challenging whether the EPA's January 2022 actions establish new legislative rules that should have gone through notice-and-comment rulemaking. A decision by the court is expected in 2024. The ultimate impacts of the EPA's current positions are subject to the outcome of the pending litigation and any potential future rulemaking and cannot be determined at this time.
On May 18, 2023, the EPA published a proposed rule to establish two new categories of federally regulated CCR, legacy surface impoundments and CCR management units (CCRMUs). The proposal establishes accelerated compliance deadlines for legacy surface impoundments to meet regulatory requirements, including a requirement to initiate closure within 12 months after the effective date of the final rule. The EPA has announced plansis also proposing a definition for CCRMUs. The EPA's proposal would also require facility evaluations to reconsider certain portionsbe completed at both active facilities and inactive facilities with one or more legacy surface impoundment to determine the presence or absence of CCRMUs. CCRMUs must comply with the CCR Rule by no later than December 2019,Rule's provisions for groundwater monitoring, corrective action, closure, and post-closure activities. On November 14, 2023, the EPA published a Notice of Data Availability supplementing the proposed rule, which sought comment on new data and a supplemental risk assessment that could be used to support final rulemaking. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in changes to deadlines and corrective action requirements.significant compliance costs.
The EPA's reconsideration of the CCR Rule is due in part to a legislative development that impacts the potential oversight role of state agencies. Under the Water Infrastructure Improvements for the Nation Act, which became law in 2016, states are allowed to establish permit programs for implementing the CCR Rule. The Georgia Department of Natural Resources has incorporated the requirements of the CCR Rule into its solid waste regulations, which established additional requirements for all of Georgia Power's CCR units, and has requested that the EPA approve its state permitting program. The other states in the Southern Company system's electric service territory have not yet submitted plans to the EPA.
Based on cost estimatesrequirements for closure and monitoring of landfills and ash ponds pursuant to the CCR Rule Southern Company recorded AROs for each CCR unit in 2015. As further analysis is performed and closure details are developed,applicable state rules, the traditional electric operating companies willhave periodically updated, and expect to continue to periodically update theseupdating, their related cost estimates and ARO liabilities for each CCR unit as necessary.additional information related to closure methodologies, schedules, and/or costs becomes available. Some of these updates have been, and future updates may be, material. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and the traditional electric operating companies could be materially impacted. See FINANCIAL CONDITION AND LIQUIDITY – "Capital"Cash Requirements," Notes 2 and Contractual Obligations" herein and Note 13 to the financial statements under "Asset Retirement Obligations"Georgia Power – Rate Plans" and Other Costs of Removal"General Litigation Matters – Alabama Power," respectively, and Note 6 to the financial statements for additional information.
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Greenhouse Gases
On May 23, 2023, the EPA published proposed GHG standards and state plan guidelines for fossil fuel-fired power plants, which would require GHG limits for subcategories of both new and existing units based on technologies such as carbon capture and sequestration, low-GHG hydrogen co-firing, and natural gas co-firing. The proposed standards for new combustion turbines include subcategories for different operational uses including peaking, intermediate, and base load. Compliance with new source standards, once finalized, begins when the unit comes online. The proposed state plan guidelines for existing units include subcategories based on unit type, retirement date, size, and capacity factor. The EPA is proposing a 24-month state plan submission deadline for the existing unit implementation and may allow states to implement some limited form of trading and averaging for the state plans. Existing source compliance is proposed to begin as early as January 1, 2030, depending on the unit type and subcategory. The EPA also proposes to simultaneously repeal the Affordable Clean Energy rule. On November 17, 2023, the EPA published a final rule updating the regulations governing the processes and timelines for state and federal plans to implement existing source GHG performance standards. While this rule establishes the general requirements and timelines for states to follow in implementing the EPA's emissions guidelines, the pending final rule for GHG emissions from fossil fuel-fired power plants is expected to include schedules and other implementation requirements that will supersede these general provisions. On November 20, 2023, the EPA published a Supplemental Notice of Proposed Rulemaking for the pending rules for fossil fuel-fired power plants requesting additional input on how the EPA should address reliability concerns in the final rules. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
In 2021, the United States officially rejoined the Paris Agreement. The Paris Agreement establishes a non-binding universal framework for addressing GHG emissions based on nationally determined emissions reduction contributions and sets in place a process for tracking progress towards the goals every five years. In 2021, President Biden announced a new target for the United States to achieve a 50% to 52% reduction in economy-wide GHG emissions from 2005 levels by 2030. The target was accepted by the United Nations as the United States' nationally determined emissions reduction contribution under the Paris Agreement.
Additional GHG policies, including legislation, may emerge in the future requiring the United States to accelerate its transition to a lower GHG emitting economy; however, associated impacts are currently unknown. The Southern Company system has transitioned from an electric generating mix of 70% coal and 15% natural gas in 2007 to a mix of 17% coal and 54% natural gas in 2023. This transition has been supported in part by the Southern Company system retiring over 6,700 MWs of coal-fired generating capacity since 2010 and converting 3,700 MWs of generating capacity from coal to natural gas since 2015. In addition, the Southern Company system's capacity mix consists of over 11,600 MWs of renewable and storage facilities through ownership and long-term PPAs. See "Environmental Laws and Regulations – Water Quality" hereinfor information regardingon plans to retire or convert to natural gas additional coal-fired generating capacity. In addition, Southern Company Gas has replaced over 6,000 miles of pipe material that was more prone to fugitive emissions (unprotected steel and cast-iron pipe), resulting in mitigation of more than 3.3 million metric tons of CO2 equivalents from its natural gas distribution system since 1998.
The following table provides the Registrants' 2022 and preliminary 2023 Scope 1 GHG emissions based on equity share of facilities:
2022Preliminary 2023
(in million metric tons of CO2 equivalent)
Southern Company(*)
8580
Alabama Power(*)
3528
Georgia Power2324
Mississippi Power99
Southern Power1313
Southern Company Gas(*)
22
(*)Includes GHG emissions attributable to disposed assets through the date of the applicable disposition and to acquired assets beginning with the date of the applicable acquisition. See Note 15 to the financial statements for additional information.
Southern Company system management has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Based on the preliminary 2023 emissions, the Southern Company system has achieved an estimated GHG emission reduction of 49% since 2007. GHG emissions decreased in 2023 when compared to 2022 as coal generation was displaced by lower carbon generation, including from Plant Vogtle Unit 3, as discussed further under RESULTS OF OPERATIONS – "Southern Company – Electricity Business" herein. Southern Company system management expects to achieve GHG reductions of greater than 50% as early as 2025, five years earlier than the established interim goal, and remain close to 50% through the late 2020s, followed thereafter by continued reductions. While none
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of Southern Company's AROs assubsidiaries are currently subject to renewable portfolio standards or similar requirements, management of December 31, 2017.the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. Southern Company system management plans to continue to pursue a diverse portfolio including low-carbon and carbon-free resources and energy efficiency resources; continue to transition the Southern Company system's generating fleet and make the necessary related investments in transmission and distribution systems; implement initiatives to reduce natural gas distribution operational emissions; continue its research and development with a particular focus on technologies that lower GHG emissions, including methods of removing carbon from the atmosphere; and constructively engage with policymakers, regulators, investors, customers, and other stakeholders to support outcomes leading to a net zero future.
Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and Southern Company Gas conduct studies to determine the extent of any required cleanup and Southern Company hashave recognized the estimated costs to clean up known impacted sites in itstheir financial statements. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The traditional electric operating companies and the natural gas distribution utilities in Illinois New Jersey,and Georgia and Florida(which represent substantially all of Southern Company Gas' accrued remediation costs) have all received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental complianceremediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies. The traditional electric operating companies and Southern Company Gas may be liable for some or all required cleanup costs for additional sites
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that may require environmental remediation. See Note 3 to the financial statements under "Environmental MattersEnvironmental Remediation""Environmental Remediation" for additional information.
Global Climate Issues
In 2015, the EPA published final rules limiting CO2 emissions from new, modified, and reconstructed fossil fuel-fired electric generating units and guidelines for states to develop plans to meet EPA-mandated CO2 emission performance standards for existing units (known as the Clean Power Plan or CPP). In February 2016, the U.S. Supreme Court granted a stay of the CPP, which will remain in effect through the resolution of litigation in the U.S. Court of Appeals for the District of Columbia challenging the legality of the CPP and any review by the U.S. Supreme Court. On March 28, 2017, the U.S. President signed an executive order directing agencies to review actions that potentially burden the development or use of domestically produced energy resources, including review of the CPP and other CO2 emissions rules. On October 10, 2017, the EPA published a proposed rule to repeal the CPP and, on December 28, 2017, published an advanced notice of proposed rulemaking regarding a CPP replacement rule.
In 2015, parties to the United Nations Framework Convention on Climate Change, including the United States, adopted the Paris Agreement, which established a non-binding universal framework for addressing greenhouse gas (GHG) emissions based on nationally determined contributions. On June 1, 2017, the U.S. President announced that the United States would withdraw from the Paris Agreement and begin renegotiating its terms. The ultimate impact of this agreement or any renegotiated agreement depends on its implementation by participating countries.
Domestic GHG policies may emerge in the future requiring the United States to transition to a lower GHG emitting economy. The Southern Company system has transitioned from an electric generating mix of 71% coal and 11% natural gas in 2005 to 30% percent coal and 46% natural gas mix in 2017 and currently includes over 8,000 MWs of renewable projects. In addition, the Southern Company system has retired 4,226 MWs of coal- and oil-fired generating capacity since 2010 and converted 3,280 MWs of generating capacity from coal to natural gas since 2015. Southern Company Gas replaced 5,300 miles of bare steel and cast-iron pipe, resulting in removal of 2.5 million metric tons of GHG from its natural gas distribution system since 1998. Based on ownership or financial control of facilities, the Southern Company system's 2016 GHG emissions (CO2 equivalent) were approximately 99 million metric tons, with 2017 emissions estimated at 96 million metric tons. This equates to a reduction of 27% between 2005 and 2016 and a preliminary estimate of 30% through 2017. To better represent GHG emission reductions, the Southern Company system is transitioning to a maximum emission baseline year of 2007 and a baseline calculation methodology consistent with the EPA's Greenhouse Gas Reporting Program methodology. On a preliminary basis, these baseline adjustments result in an estimated GHG emission reduction of 36% from 2007 through 2017.
FERCRegulatory Matters
Market-Based Rate Authority
The traditional electric operating companiesSee OVERVIEW – "Recent Developments" herein and Southern Power have authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies and Southern Power to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies and Southern Power filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On FebruaryNote 2 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for the traditional electric operating companies' and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.
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On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
The ultimate outcome of these matters cannot be determined at this time.
Southern Company Gas
At December 31, 2017, Southern Company Gas' midstream operations business was involved in two gas pipeline construction projects, the Atlantic Coast Pipeline project and the PennEast Pipeline project, which received FERC approval in October 2017 and January 2018, respectively. Southern Company Gas' portion of the expected capital expenditures for these projects total approximately $586 million. These projects, along with Southern Company Gas' existing pipelines, are intended to provide diverse sources of natural gas supplies to customers, resolve current and long-term supply planning for new capacity, enhance system reliability, and generate economic development in the areas served.
On August 1, 2017, the Dalton Pipeline was placed in service as authorized by the FERC and transportation service for customers commenced. See Note 4 to the financial statements for additional information.
Regulatory Mattersa discussion of regulatory matters related to Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas, including items that could impact the applicable Registrants' future earnings, cash flows, and/or financial condition.
Alabama Power
On July 14, 2023, Alabama Power's revenues from regulated retail operations are collected through various rate mechanisms subject toPower issued a request for proposals of between 100 MWs and 1,200 MWs of capacity beginning no later than December 1, 2028, with consideration for commencement as early as 2025. Any purchases will depend upon the oversightcost competitiveness of the Alabama PSC.respective offers, as well as other options available to Alabama Power, currently recovers its costs from the regulated retail business primarily through Rate RSE, Rate CNP, Rate ECR, and Rate NDR. In addition, the Alabama PSC issues accounting orders to address current events impacting Alabama Power. See Note 3 to the financial statements under "Regulatory MattersAlabama Power" for additional information regarding Alabama Power's rate mechanisms and accounting orders.
Rate RSE
The Alabama PSC has adopted Rate RSE that provides for periodic annual adjustments based upon Alabama Power's projected weighted cost of equity (WCE) compared to an allowable range. Rate RSE adjustments are based on forward-looking information for the applicable upcoming calendar year. Rate RSE adjustments for any two-year period, when averaged together, cannot exceed 4.0% and any annual adjustment is limited to 5.0%. If Alabama Power's actual retail return is above the allowed WCE range, the excess will be refunded to customers unless otherwise directedwould ultimately require approval by the Alabama PSC; however, there is no provision for additional customer billings should the actual retail return fall below the WCE range.
At December 31, 2016, Alabama Power's retail return exceeded the allowed WCE range which resulted in Alabama Power establishing a $73 million Rate RSE refund liability. In accordance with an Alabama PSC order issued on February 14, 2017, Alabama Power applied the full amount of the refund to reduce the under recovered balance of Rate CNP PPA as discussed further below.
Effective in January 2017, Rate RSE increased 4.48%, or $245 million annually. At December 31, 2017, Alabama Power's actual retail return was within the allowed WCE range. On December 1, 2017, Alabama Power made its required annual Rate RSE submission to the Alabama PSC of projected data for calendar year 2018. Projected earnings were within the specified range; therefore, retail rates under Rate RSE remained unchanged for 2018.
In conjunction with Rate RSE, Alabama Power has an established retail tariff that provides for an adjustment to customer billings to recognize the impact of a change in the statutory income tax rate. As a result of Tax Reform Legislation, the application of this tariff would reduce annual retail revenue by approximately $250 million over the remainder of 2018.PSC. The ultimate outcome of this matter cannot be determined at this time.
Rate CNP PPA
Alabama Power's retail rates, approved by the Alabama PSC, provide for adjustments under Rate CNP to recognize the placing of new generating facilities into retail service. Alabama Power may also recover retail costs associated with certificated PPAs under Rate CNP PPA. On March 7, 2017, the Alabama PSC issued a consent order that Alabama Power leave in effect the current Rate
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CNP PPA factor for billings for the period April 1, 2017 through March 31, 2018. No adjustment to Rate CNP PPA is expected in 2018.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, Alabama Power eliminated the under recovered balance in Rate CNP PPA at December 31, 2016, which totaled approximately $142 million. As discussed herein under "Rate RSE," Alabama Power utilized the full amount of its $73 million Rate RSE refund liability to reduce the amount of the Rate CNP PPA under recovery and reclassified the remaining $69 million to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of Alabama Power's next depreciation study, which is expected to occur within the next two to four years. Alabama Power's current depreciation study became effective January 1, 2017.
Rate CNP Compliance
Rate CNP Compliance allows for the recovery of Alabama Power's retail costs associated with laws, regulations, and other such mandates directed at the utility industry involving the environment, security, reliability, safety, sustainability, or similar considerations impacting Alabama Power's facilities or operations. Rate CNP Compliance is based on forward-looking information and provides for the recovery of these costs pursuant to a factor that is calculated annually. Compliance costs to be recovered include operations and maintenance expenses, depreciation, and a return on certain invested capital. Revenues for Rate CNP Compliance, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor will have no significant effect on revenues or net income, but will affect annual cash flow. Changes in Rate CNP Compliance-related operations and maintenance expenses and depreciation generally will have no effect on net income.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, Alabama Power reclassified $36 million of its under recovered balance in Rate CNP Compliance to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of Alabama Power's next depreciation study, which is expected to occur within the next two to four years. Alabama Power's current depreciation study became effective January 1, 2017.
On December 5, 2017, the Alabama PSC issued a consent order that Alabama Power leave in effect for 2018 the factors associated with Alabama Power's compliance costs for the year 2017, with any under-collected amount for prior years deemed recovered before any current year amounts. Any under recovered amounts associated with 2018 will be reflected in the 2019 filing.
Environmental Accounting Order
Based on an order from the Alabama PSC, Alabama Power is allowed to establish a regulatory asset to record the unrecovered investment costs, including the unrecovered plant asset balance and the unrecovered costs associated with site removal and closure associated with future unit retirements caused by environmental regulations. The regulatory asset will be amortized and recovered over the affected unit's remaining useful life, as established prior to the decision regarding early retirement through Rate CNP Compliance. See "Environmental MattersEnvironmental Laws and Regulations" herein for additional information regarding environmental regulations.
Georgia Power
Georgia Power's revenues from regulated retail operations are collected through various rate mechanisms subject to the oversight of the Georgia PSC. Georgia Power currently recovers its costs from the regulated retail business through the 2013 ARP, which includes traditional base tariff rates, Demand-Side Management (DSM) tariffs, Environmental Compliance Cost Recovery (ECCR) tariffs, and Municipal Franchise Fee (MFF) tariffs. In addition, financing costs on certified project costs related to the construction of Plant Vogtle Units 3 and 4 are being collected through the NCCR tariff and fuel costs are collected through a separate fuel cost recovery tariff. See Note 3 to the financial statements under "Regulatory MattersGeorgia Power" for additional information.
Rate Plans
Pursuant to the terms and conditions of a settlement agreement related to Southern Company's acquisition of Southern Company Gas approved by the Georgia PSC in April 2016, the 2013 ARP will continue in effect until December 31, 2019, and Georgia Power will be required to file its next base rate case by July 1, 2019. Furthermore, through December 31, 2019, Georgia Power and Atlanta Gas Light Company each will retain their respective merger savings, net of transition costs, as defined in the settlement agreement; through December 31, 2022, such net merger savings applicable to each will be shared on a 60/40 basis with their respective customers; thereafter, all merger savings will be retained by customers. See Note 3 to the financial
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statements under "Regulatory MattersGeorgia PowerRate Plans" for additional information regarding the 2013 ARP and Note 12 to the financial statements under "Southern CompanyMerger with Southern Company Gas" for additional information regarding the Merger.
In accordance with the 2013 ARP, the Georgia PSC approved increases to tariffs effective January 1, 2016 as follows: (1) traditional base tariff rates by approximately $49 million; (2) ECCR tariff by approximately $75 million; (3) DSM tariffs by approximately $3 million; and (4) MFF tariff by approximately $13 million, for a total increase in base revenues of approximately $140 million. There were no changes to these tariffs in 2017.
Under the 2013 ARP, Georgia Power's retail ROE is set at 10.95% and earnings are evaluated against a retail ROE range of 10.00% to 12.00%. Two-thirds of any earnings above 12.00% will be directly refunded to customers, with the remaining one-third retained by Georgia Power. There will be no recovery of any earnings shortfall below 10.00% on an actual basis. In 2015, Georgia Power's retail ROE was within the allowed retail ROE range. In 2016, Georgia Power's retail ROE exceeded 12.00%, and Georgia Power will refund to retail customers approximately $44 million in 2018, as approved by the Georgia PSC on January 16, 2018. In 2017, Georgia Power's retail ROE was within the allowed retail ROE range, subject to review and approval by the Georgia PSC.
On January 19, 2018, the Georgia PSC issued an order on the Tax Reform Legislation, which was amended on February 16, 2018 (Tax Order). In accordance with the Tax Order, Georgia Power is required to submit its analysis of the Tax Reform Legislation and related recommendations to address the related impacts on Georgia Power's cost of service and annual revenue requirements by March 6, 2018. The ultimate outcome of this matter cannot be determined at this time.
Integrated Resource Plan
See "Environmental Matters" herein for additional information regarding proposed and final EPA rules and regulations, including revisions to ELG for steam electric power plants and additional regulations of CCR and CO2.
In July 2016, the Georgia PSC approved Georgia Power's triennial Integrated Resource Plan (2016 IRP) including the decertification and retirement of Plant Mitchell Units 3, 4A, and 4B (217 MWs) and Plant Kraft Unit 1 (17 MWs), as well as the decertification of the Intercession City unit (143 MWs total capacity). In August 2016, the Plant Mitchell and Plant Kraft units were retired and Georgia Power sold its 33% ownership interest in the Intercession City unit to Duke Energy Florida, LLC.
Additionally, the Georgia PSC approved Georgia Power's environmental compliance strategy and related expenditures proposed in the 2016 IRP, including measures taken to comply with existing government-imposed environmental mandates, subject to limits on expenditures for Plant McIntosh Unit 1 and Plant Hammond Units 1 through 4.Construction Programs
The Georgia PSC approved the reclassification of the remaining net book value of Plant Mitchell Unit 3 and costs associated with materials and supplies remaining at the unit retirement date to a regulatory asset. Recovery of the unit's net book value will continue through December 31, 2019, as provided in the 2013 ARP. The timing of the recovery of the remaining balance of the unit's net book value as of December 31, 2019 and costs associated with materials and supplies remaining at the unit retirement date was deferred for consideration in Georgia Power's 2019 base rate case.
The Georgia PSC also approved the Renewable Energy Development Initiative (REDI) to procure an additional 1,200 MWs of renewable resources primarily utilizing market-based prices established through a competitive bidding process with expected in-service dates between 2018 and 2021. Additionally, 200 MWs of self-build capacity for use by Georgia Power was approved, as well as consideration for no more than 200 MWs of capacity as part of a renewable commercial and industrial program.
In 2017, Georgia Power filed for and received certification for 510 MWs of REDI utility-scale PPAs for solar generation resources, which are expected to be in operation by the end of 2019. Georgia Power also filed for and received approval to develop several solar generation projects to fulfill the approved self-build capacity.
In the 2016 IRP, the Georgia PSC also approved recovery of costs up to $99 million through June 30, 2019 to preserve nuclear generation as an option at a future generation site in Stewart County, Georgia. On March 7, 2017, the Georgia PSC approved Georgia Power's decision to suspend work at the site due to changing economics, including lower load forecasts and fuel costs. The timing of recovery for costs incurred of approximately $50 million is expected to be determined by the Georgia PSC in a future Georgia Power rate case.
Storm Damage Recovery
Georgia Power is accruing $30 million annually through December 31, 2019, as provided in the 2013 ARP, for incremental operating and maintenance costs of damage from major storms to its transmission and distribution facilities. Hurricanes Irma and Matthew caused significant damage to Georgia Power's transmission and distribution facilities during September 2017 and October 2016, respectively. The incremental restoration costs related to these hurricanes deferred in Georgia Power's regulatory
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asset for storm damage totaled approximately $260 million. At December 31, 2017, the total balance in Georgia Power's regulatory asset related to storm damage was $333 million. The rate of storm damage cost recovery is expected to be adjusted as part of Georgia Power's next base rate case required to be filed by July 1, 2019. As a result of this regulatory treatment, costs related to storms are not expected to have a material impact on Southern Company's financial statements. See Note 3 to the financial statements under "Regulatory MattersGeorgia PowerStorm Damage Recovery" for additional information regarding Georgia Power's storm damage reserve.
Gulf Power
On April 4, 2017, the Florida PSC approved the 2017 Rate Case Settlement Agreement among Gulf Power and three intervenors with respect to Gulf Power's request in 2016 to increase retail base rates. Among the terms of the 2017 Rate Case Settlement Agreement, Gulf Power increased rates effective with the first billing cycle in July 2017 to provide an annual overall net customer impact of approximately $54.3 million. The net customer impact consisted of a $62.0 million increase in annual base revenues, less an annual purchased power capacity cost recovery clause credit for certain wholesale revenues of approximately $8 million through December 2019. In addition, Gulf Power continued its authorized retail ROE midpoint (10.25%) and range (9.25% to 11.25%) and is deemed to have a maximum equity ratio of 52.5% for all retail regulatory purposes. Gulf Power also began amortizing the regulatory asset associated with the investment balances remaining after the retirement of Plant Smith Units 1 and 2 (357 MWs) over 15 years effective January 1, 2018 and implemented new depreciation rates effective January 1, 2018. The 2017 Rate Case Settlement Agreement also resulted in a $32.5 million write-down of Gulf Power's ownership of Plant Scherer Unit 3 (205 MWs), which was recorded in the first quarter 2017. The remaining issues related to the inclusion of Gulf Power's investment in Plant Scherer Unit 3 in retail rates have been resolved as a result of the 2017 Rate Case Settlement Agreement, including recoverability of certain costs associated with the ongoing ownership and operation of the unit through the environmental cost recovery clause.
The 2017 Rate Case Settlement Agreement set forth a process for addressing the revenue requirement effects of the Tax Reform Legislation through a prospective change to Gulf Power's base rates. Under the terms of the 2017 Rate Case Settlement Agreement, by March 1, 2018, Gulf Power must identify the revenue requirements impacts and defer them to a regulatory asset or regulatory liability to be considered for prospective application in a change to base rates in a limited scope proceeding before the Florida PSC. In lieu of this approach, on February 14, 2018, the parties to the 2017 Rate Case Settlement Agreement filed a new stipulation and settlement agreement (2018 Tax Reform Settlement Agreement) with the Florida PSC. If approved, the 2018 Tax Reform Settlement Agreement will result in annual reductions of $18.2 million to Gulf Power's base rates and $15.6 million to Gulf Power's environmental cost recovery rates effective beginning the first calendar month following approval.
The 2018 Tax Reform Settlement Agreement also provides for a one-time refund of $69.4 million for the retail portion of unprotected (not subject to normalization) deferred tax liabilities through Gulf Power's fuel cost recovery rate over the remainder of 2018. In addition, a limited scope proceeding to address the flow back of protected deferred tax liabilities will be initiated by May 1, 2018 and Gulf Power will record a regulatory liability for the related 2018 amounts eligible to be returned to customers consistent with IRS normalization principles. Unless otherwise agreed to by the parties to the 2018 Tax Reform Settlement Agreement, amounts recorded in this regulatory liability will be refunded to retail customers in 2019 through Gulf Power's fuel cost recovery rate.
If the 2018 Tax Reform Settlement Agreement is approved, the 2017 Rate Case Settlement Agreement will be amended to increase Gulf Power's maximum equity ratio from 52.5% to 53.5% for regulatory purposes.
The ultimate outcome of these matters cannot be determined at this time.
Mississippi Power
On February 7, 2018, Mississippi Power revised its annual projected PEP filing for 2018 to reflect the impacts of the Tax Reform Legislation. The revised filing requests an increase of $26 million in annual revenues, based on a performance adjusted ROE of 9.33% and an increased equity ratio of 55%. The ultimate outcome of this matter cannot be determined at this time.
Southern Company Gas
The natural gas distribution utilities are subject to regulation and oversight by their respective state regulatory agencies for the rates charged to their customers and other matters. These agencies approve rates designed to provide the opportunity to generate revenues to recover all prudently-incurred costs, including a return on rate base sufficient to pay interest on debt and provide a reasonable ROE.
The natural gas market for Atlanta Gas Light was deregulated in 1997. Accordingly, marketers, rather than a traditional utility, sell natural gas to end-use customers in Georgia and handle customer billing functions. Atlanta Gas Light earns revenue for its
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distribution services by charging rates to its customers based primarily on monthly fixed charges that are set by the Georgia PSC and adjusted periodically.
With the exception of Atlanta Gas Light, the natural gas distribution utilities are authorized by the relevant regulatory agencies in the states in which they serve to use natural gas cost recovery mechanisms that adjust rates to reflect changes in the wholesale cost of natural gas and ensure recovery of all costs prudently incurred in purchasing natural gas for customers. Natural gas cost recovery revenues are adjusted for differences in actual recoverable natural gas costs and amounts billed in current regulated rates. Changes in the billing factor will not have a significant effect on revenues or net income, but will affect cash flows. In addition to natural gas cost recovery mechanisms, there are other cost recovery mechanisms, such as regulatory riders, which vary by utility but allow recovery of certain costs, such as those related to infrastructure replacement programs, as well as environmental remediation and energy efficiency plans. See Note 1 to the financial statements under "Cost of Natural Gas" for additional information.
Regulatory Infrastructure Programs
Certain of Southern Company Gas' natural gas distribution utilities are involved in ongoing capital projects associated with infrastructure improvement programs that have been previously approved by their applicable state regulatory agencies and provide an appropriate return on invested capital. These infrastructure improvement programs are designed to update or expand the natural gas distribution systems of the natural gas distribution utilities to improve reliability and meet operational flexibility and growth. Initial program lengths range from nine to 10 years, with completion dates ranging from 2020 through 2025. The total expected investment under these programs for 2018 is $395 million.
Base Rate Cases
On January 31, 2018, the Illinois Commerce Commission approved a $137 million increase in Nicor Gas' annual base rate revenues, including $93 million related to the recovery of investments under Nicor Gas' infrastructure program, effective February 8, 2018, based on a ROE of 9.8%.
The Illinois Commerce Commission issued an order effective January 25, 2018 that requires utilities in the state to record the impacts of the Tax Reform Legislation, including the reduction in the corporate income tax rate to 21% and the impact of excess deferred income taxes, as a regulatory liability. On February 20, 2018, the Illinois Commerce Commission granted Nicor Gas' application for rehearing to file revised base rates and tariffs, which Nicor Gas expects to file by the end of the second quarter 2018.
On December 1, 2017, Atlanta Gas Light filed its 2018 annual rate adjustment with the Georgia PSC. If approved, Atlanta Gas Light's annual base rate revenues will increase by $22 million, effective June 1, 2018. Atlanta Gas Light will file a revised rate adjustment to incorporate the effects of the Tax Reform Legislation in the first quarter 2018. The Georgia PSC is expected to rule on the revised requested increase in the second quarter 2018.
The ultimate outcome of these matters cannot be determined at this time.
Fuel Cost Recovery
The traditional electric operating companies each have established fuel cost recovery rates approved by their respective state PSCs. Fuel cost recovery revenues are adjusted for differences in actual recoverable fuel costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor will not have a significant effect on Southern Company's revenues or net income, but will affect cash flow. The traditional electric operating companies continuously monitor their under or over recovered fuel cost balances and make appropriate filings with their state PSCs to adjust fuel cost recovery rates as necessary.
See Note 1 to the financial statements under "Revenues" and Note 3 to the financial statements under "Regulatory MattersAlabama PowerRate ECR" and "Regulatory MattersGeorgia PowerFuel Cost Recovery" for additional information.
Kemper County Energy Facility
The Kemper County energy facility was approved by the Mississippi PSC as an IGCC facility in the 2010 CPCN proceedings, subject to a construction cost cap of $2.88 billion, net of $245 million of the Initial DOE Grants and excluding the Cost Cap Exceptions. The combined cycle and associated common facilities portions of the Kemper County energy facility were placed in service in August 2014. In December 2015, the Mississippi PSC issued the In-Service Asset Rate Order, authorizing rates that provided for the recovery of approximately $126 million annually related to the assets previously placed in service.
On June 21, 2017, the Mississippi PSC stated its intent to issue the Kemper Settlement Order (which occurred on July 6, 2017) directing Mississippi Power to pursue a settlement under which the Kemper County energy facility would be operated as a natural
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gas plant, rather than an IGCC plant, and address all issues associated with the Kemper County energy facility. The Kemper Settlement Order established the Kemper Settlement Docket for the purposes of pursuing a global settlement of the related costs.
On June 28, 2017, Mississippi Power notified the Mississippi PSC that it would begin a process to suspend operations and start-up activities on the gasifier portion of the Kemper County energy facility, given the uncertainty as to its future. At the time of project suspension, the total cost estimate for the Kemper County energy facility was approximately $7.38 billion, including approximately $5.95 billion of costs subject to the construction cost cap, and was net of the $137 million in Additional DOE Grants. In the aggregate, Mississippi Power had incurred charges of $3.07 billion ($1.89 billion after tax) as a result of changes in the cost estimate above the cost cap for the Kemper IGCC through May 31, 2017. Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, Mississippi Power recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine.
On February 6, 2018, the Mississippi PSC voted to approve the Kemper Settlement Agreement related to cost recovery for the Kemper County energy facility among Mississippi Power, the MPUS, and certain intervenors. The Kemper Settlement Agreement provides for an annual revenue requirement of approximately $99.3 million for costs related to the Kemper County energy facility, which includes the impact of Tax Reform Legislation. The revenue requirement is based on (i) a fixed ROE for 2018 of 8.6%, excluding any performance adjustment, (ii) a ROE for 2019 calculated in accordance with PEP, excluding the performance adjustment, (iii) for future years, a performance-based ROE calculated pursuant to PEP, and (iv) amortization periods for the related regulatory assets and liabilities of eight years and six years, respectively. The revenue requirement also reflects a disallowance related to a portion of Mississippi Power's investment in the Kemper County energy facility requested for inclusion in rate base, which was recorded in the fourth quarter 2017 as an additional charge to income of approximately $78 million ($85 million net of accumulated depreciation of $7 million) pre-tax ($48 million after tax).
Under the Kemper Settlement Agreement, retail customer rates will reflect a reduction of approximately $26.8 million annually and include no recovery for costs associated with the gasifier portion of the Kemper County energy facility in 2018 or at any future date. On February 12, 2018, Mississippi Power made the required compliance filing with the Mississippi PSC. The Kemper Settlement Agreement also requires (i) the CPCN for the Kemper County energy facility to be modified to limit it to natural gas combined cycle operation and (ii) Mississippi Power to file a reserve margin plan with the Mississippi PSC by August 2018.
During the third and fourth quarters of 2017, Mississippi Power recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during the suspension period prior to conclusion of the Kemper Settlement Docket, as well as the charge associated with the Kemper Settlement Agreement. Additional pre-tax cancellation costs, including mine and plant closure and contract termination costs, currently estimated at approximately $50 million to $100 million (excluding salvage), are expected to be incurred in 2018. Mississippi Power has begun efforts to dispose of or abandon the mine and gasifier-related assets.
Total pre-tax charges to income related to the Kemper County energy facility were $3.4 billion ($2.4 billion after tax) for the year ended December 31, 2017. In the aggregate, since the Kemper County energy facility project started, Mississippi Power has incurred charges of $6.2 billion ($4.1 billion after tax) through December 31, 2017.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges.
See Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
Litigation
On April 26, 2016, a complaint against Mississippi Power was filed in Harrison County Circuit Court (Circuit Court) by Biloxi Freezing & Processing Inc., Gulfside Casino Partnership, and John Carlton Dean, which was amended and refiled on July 11, 2016 to include, among other things, Southern Company as a defendant. The individual plaintiff alleges that Mississippi Power and Southern Company violated the Mississippi Unfair Trade Practices Act. All plaintiffs have alleged that Mississippi Power and Southern Company concealed, falsely represented, and failed to fully disclose important facts concerning the cost and schedule of the Kemper County energy facility and that these alleged breaches have unjustly enriched Mississippi Power and Southern Company. The plaintiffs seek unspecified actual damages and punitive damages; ask the Circuit Court to appoint a receiver to oversee, operate, manage, and otherwise control all affairs relating to the Kemper County energy facility; ask the Circuit Court to revoke any licenses or certificates authorizing Mississippi Power or Southern Company to engage in any business related to the Kemper County energy facility in Mississippi; and seek attorney's fees, costs, and interest. The plaintiffs also seek an injunction to prevent any Kemper County energy facility costs from being charged to customers through electric rates. On June 23, 2017, the Circuit Court ruled in favor of motions by Southern Company and Mississippi Power and dismissed the case. On July 7, 2017, the
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plaintiffs filed notice of an appeal. Southern Company believes this legal challenge has no merit; however, an adverse outcome in this proceeding could have a material impact on Southern Company's results of operations, financial condition, and liquidity. Southern Company intends to vigorously defend itself in this matter and the ultimate outcome of this matter cannot be determined at this time.
On June 9, 2016, Treetop Midstream Services, LLC (Treetop) and other related parties filed a complaint against Mississippi Power, Southern Company, and SCS in the state court in Gwinnett County, Georgia. The complaint related to the cancelled CO2 contract with Treetop and alleged fraudulent misrepresentation, fraudulent concealment, civil conspiracy, and breach of contract on the part of Mississippi Power, Southern Company, and SCS and sought compensatory damages of $100 million, as well as unspecified punitive damages. Southern Company, Mississippi Power, and SCS moved to compel arbitration pursuant to the terms of the CO2 contract, which the court granted on May 4, 2017. On June 28, 2017, Treetop and other related parties filed a claim for arbitration requesting $500 million in damages. On December 28, 2017, Mississippi Power reached a settlement agreement with Treetop and other related parties and the arbitration was dismissed.
Construction Program
Overview
The subsidiary companies of Southern CompanyRegistrants are engaged in continuous construction programs to accommodate existing and estimated future loads on their respective systems. The Southern Company system intendsstrategy continues to continue its strategy ofinclude developing and constructing new electric generating facilities, adding environmental modifications to certain existing units, expanding and improving the electric transmission and electric and natural gas distribution systems, and updatingundertaking projects to comply with environmental laws and expanding the natural gas distribution systems. regulations.
For the traditional electric operating companies, major generation construction projects are subject to state PSC approval in order to be included in retail rates. WhileThe largest construction project currently underway in the Southern Company system is Plant Vogtle Unit 4. See Note 2 to the financial statements under "Georgia Power generally constructs– Nuclear Construction" for additional information. Also see Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for information regarding Georgia Power's request with the Georgia PSC to develop, own, and acquires generation assets covered by long-term PPAs, any uncontracted capacity could negatively affect future earnings. operate three simple cycle combustion turbines at Plant Yates.
See Note 15 to the financial statements under "Southern Power" for information relating to Southern Power's construction of renewable energy facilities.
Southern Company Gas is engaged in various infrastructure improvement programs designed to update or expand the natural gas distribution systems of the natural gas distribution utilities to improve reliability and resiliency, reduce emissions, and meet operational flexibility and growth. The natural gas distribution utilities recover their investment and a return associated with these infrastructure programs through their regulated rates. The Southern Company system's construction program is currently estimated to total approximately $9.4 billion, $9.3 billion, $8.4 billion, $7.0 billion, and $6.9 billion for 2018, 2019, 2020, 2021, and 2022, respectively.
The largest construction project currently underway in the Southern Company system is Plant Vogtle Units 3 and 4 (45.7% ownership interest by Georgia Power in the two units, each with approximately 1,100 MWs). See Note 32 to the financial statements under "Nuclear Construction" for additional information. See Note 12 to the financial statements under "Southern Power""Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information about costs relating to Southern Power's acquisitions that involve construction of renewable energy facilities. See Note 3 to the financial statements under "Regulatory Matterson Southern Company GasRegulatory Infrastructure Programs" for additional information regarding infrastructure improvement programs at the natural gas distribution utilities.Gas' construction program.
Also see
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See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations""Cash Requirements" herein for additional information regarding Southern Company'sthe Registrants' capital requirements for its subsidiaries'their construction programs.
Nuclear Construction
Vogtle 3 and 4 Agreement and EPC Contractor Bankruptcy
In 2008, Georgia Power, actingprograms, including estimated totals for itself and as agent for the Vogtle Owners, entered into the Vogtle 3 and 4 Agreement. Under the termseach of the Vogtle 3 and 4 Agreement, the Vogtle Owners agreed to pay a purchase price subject to certain price escalations and adjustments, including fixed escalation amounts and index-based adjustments, as well as adjustments for change orders, and performance bonuses for early completion and unit performance. Under the Toshiba Guarantee, Toshiba guaranteed certain payment obligations of the EPC Contractor, including any liability of the EPC Contractor for abandonment of work. In the first quarter 2016, Westinghouse delivered to the Vogtle Owners a total of $920 million of letters of credit from financial institutions (Westinghouse Letters of Credit) to secure a portion of the EPC Contractor's potential obligations under the Vogtle 3 and 4 Agreement.next five years.
Subsequent to the EPC Contractor bankruptcy filing, a number of subcontractors to the EPC Contractor alleged non-payment by the EPC Contractor for amounts owed for work performed on Plant Vogtle Units 3 and 4. Georgia Power, acting for itself and as agent for the Vogtle Owners, has taken actions to remove liens filed by these subcontractors through the posting of surety bonds. Related to such liens, certain subcontractors have filed, and additional subcontractors may file, actions against the EPC Contractor
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Southern Company and Subsidiary Companies 2017 Annual ReportPower's Power Sales Agreements


and the Vogtle Owners to preserve their payment rights with respect to such claims. All amounts associated with the removal of subcontractor liens and other EPC Contractor pre-petition accounts payable have been paid or accrued as of December 31, 2017.
On June 9, 2017, Georgia Power and the other Vogtle Owners and Toshiba entered into the Guarantee Settlement Agreement. Pursuant to the Guarantee Settlement Agreement, Toshiba acknowledged the amount of its obligation was $3.68 billion (Guarantee Obligations), of which Georgia Power's proportionate share was approximately $1.7 billion. The Guarantee Settlement Agreement provided for a schedule of payments for the Guarantee Obligations beginning in October 2017 and continuing through January 2021. Toshiba made the first three payments as scheduled. On December 8, 2017, Georgia Power, the other Vogtle Owners, certain affiliates of the Municipal Electric Authority of Georgia (MEAG Power), and Toshiba entered into Amendment No. 1 to the Guarantee Settlement Agreement (Guarantee Settlement Agreement Amendment). The Guarantee Settlement Agreement Amendment provided that Toshiba's remaining payment obligations under the Guarantee Settlement Agreement were due and payable in full on December 15, 2017, which Toshiba satisfied on December 14, 2017. Pursuant to the Guarantee Settlement Agreement Amendment, Toshiba was deemed to be the owner of certain pre-petition bankruptcy claims of Georgia Power, the other Vogtle Owners, and certain affiliates of MEAG Power against Westinghouse, and Georgia Power and the other Vogtle Owners surrendered the Westinghouse Letters of Credit.
Additionally, on June 9, 2017, Georgia Power, acting for itself and as agent for the other Vogtle Owners, and the EPC Contractor entered into the Vogtle Services Agreement, which was amended and restated on July 20, 2017. On July 20, 2017, the bankruptcy court approved the EPC Contractor's motion seeking authorization to (i) enter into the Vogtle Services Agreement, (ii) assume and assign to the Vogtle Owners certain project-related contracts, (iii) join the Vogtle Owners as counterparties to certain assumed project-related contracts, and (iv) reject the Vogtle 3 and 4 Agreement. The Vogtle Services Agreement, and the EPC Contractor's rejection of the Vogtle 3 and 4 Agreement, became effective upon approval by the DOE on July 27, 2017. The Vogtle Services Agreement will continue until the start-up and testing of Plant Vogtle Units 3 and 4 are complete and electricity is generated and sold from both units. The Vogtle Services Agreement is terminable by the Vogtle Owners upon 30 days' written notice.
Effective October 23, 2017, Georgia Power, acting for itself and as agent for the other Vogtle Owners, entered into a construction completion agreement with Bechtel, whereby Bechtel will serve as the primary contractor for the remaining construction activities for Plant Vogtle Units 3 and 4 (Bechtel Agreement). Facility design and engineering remains the responsibility of the EPC Contractor under the Vogtle Services Agreement. The Bechtel Agreement is a cost reimbursable plus fee arrangement, whereby Bechtel will be reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Vogtle Owner is severally (not jointly) liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The Vogtle Owners may terminate the Bechtel Agreement at any time for their convenience, provided that the Vogtle Owners will be required to pay amounts related to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs, and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Vogtle Owner suspensions of work, certain breaches of the Bechtel Agreement by the Vogtle Owners, Vogtle Owner insolvency, and certain other events. Pursuant to the Loan Guarantee Agreement between Georgia Power and the DOE, Georgia Power is required to obtain the DOE's approval of the Bechtel Agreement prior to obtaining any further advances under the Loan Guarantee Agreement.
On November 2, 2017, the Vogtle Owners entered into an amendment to their joint ownership agreements for Plant Vogtle Units 3 and 4 (as amended, Vogtle Joint Ownership Agreements) to provide for, among other conditions, additional Vogtle Owner approval requirements. Pursuant to the Vogtle Joint Ownership Agreements, the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 must vote to continue construction if certain adverse events occur, including (i) the bankruptcy of Toshiba; (ii) termination or rejection in bankruptcy of certain agreements, including the Vogtle Services Agreement or the Bechtel Agreement; (iii) the Georgia PSC or Georgia Power determines that any of Georgia Power's costs relating to the construction of Plant Vogtle Units 3 and 4 will not be recovered in retail rates because such costs are deemed unreasonable or imprudent; or (iv) an increase in the construction budget contained in the seventeenth VCM report of more than $1 billion or extension of the project schedule contained in the seventeenth VCM report of more than one year. In addition, pursuant to the Vogtle Joint Ownership Agreements, the required approval of holders of ownership interests in Plant Vogtle Units 3 and 4 is at least (i) 90% for a change of the primary construction contractor and (ii) 67% for material amendments to the Vogtle Services Agreement or agreements with Southern Nuclear or the primary construction contractor, including the Bechtel Agreement. The Vogtle Joint Ownership Agreements also confirm that the Vogtle Owners' sole recourse against Georgia Power or Southern Nuclear for any action or inaction in connection with their performance as agent for the Vogtle Owners is limited to removal of Georgia Power and/or Southern Nuclear as agent, except in cases of willful misconduct.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)General
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Regulatory Matters
In 2009, the Georgia PSC voted to certify construction of Plant Vogtle Units 3 and 4Power has PPAs with a certified capital cost of $4.418 billion. In addition, in 2009 the Georgia PSC approved inclusion of the Plant Vogtle Units 3 and 4 related CWIP accounts in rate base, and the State of Georgia enacted the Georgia Nuclear Energy Financing Act, which allows Georgia Power to recover financing costs for nuclear construction projects certified by the Georgia PSC. Financing costs are recovered on all applicable certified costs through annual adjustments to the NCCR tariff up to the certified capital cost of $4.418 billion. As of December 31, 2017, Georgia Power had recovered approximately $1.6 billion of financing costs. On January 30, 2018, Georgia Power filed to decrease the NCCR tariff by approximately $50 million, effective April 1, 2018, pending Georgia PSC approval. The decrease reflects the payments received under the Guarantee Settlement Agreement, the Customer Refunds ordered by the Georgia PSC aggregating approximately $188 million, and the estimated effects of Tax Reform Legislation. The Customer Refunds were recognized as a regulatory liability as of December 31, 2017 and will be paid in three installments of $25 to each retail customer no later than the third quarter 2018.
Georgia Power is required to file semi-annual VCM reports with the Georgia PSC by February 28 and August 31 each year. In October 2013, in connection with the eighth VCM report, the Georgia PSC approved a stipulation (2013 Stipulation) between Georgia Power and the staff of the Georgia PSC to waive the requirement to amend the Plant Vogtle Units 3 and 4 certificate in accordance with the 2009 certification order until the completion of Plant Vogtle Unit 3, or earlier if deemed appropriate by the Georgia PSC and Georgia Power.
On December 20, 2016, the Georgia PSC voted to approve a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with the fifteenth VCM report. On December 21, 2017, the Georgia PSC voted to approve (and issued its related order on January 11, 2018) certain recommendations made by Georgia Power in the seventeenth VCM report and modifying the Vogtle Cost Settlement Agreement. The Vogtle Cost Settlement Agreement, as modified by the January 11, 2018 order, resolved the following regulatory matters related to Plant Vogtle Units 3 and 4: (i) none of the $3.3 billion of costs incurred through December 31, 2015 and reflected in the fourteenth VCM report should be disallowed from rate base on the basis of imprudence; (ii) the Contractor Settlement Agreement was reasonable and prudent and none of the amounts paid pursuant to the Contractor Settlement Agreement should be disallowed from rate base on the basis of imprudence; (iii) (a) capital costs incurred up to $5.680 billion would be presumed to be reasonable and prudent with the burden of proof on any party challenging such costs, (b) Georgia Power would have the burden to show that any capital costs above $5.680 billion were prudent, and (c) a revised capital cost forecast of $7.3 billion (after reflecting the impact of payments received under the Guarantee Settlement Agreement and Customer Refunds) is found reasonable; (iv) construction of Plant Vogtle Units 3 and 4 should be completed, with Southern Nuclear serving as project manager and Bechtel as primary contractor; (v) approved and deemed reasonable Georgia Power's revised schedule placing Plant Vogtle Units 3 and 4 in service in November 2021 and November 2022, respectively; (vi) confirmed that the revised cost forecast does not represent a cost cap and that prudence decisions on cost recovery will be made at a later date, consistent with applicable Georgia law; (vii) reduced the ROE used to calculate the NCCR tariff (a) from 10.95% (the ROE rate setting point authorized by the Georgia PSC in the 2013 ARP) to 10.00% effective January 1, 2016, (b) from 10.00% to 8.30%, effective January 1, 2020, and (c) from 8.30% to 5.30%, effective January 1, 2021 (provided that the ROE in no case will be less than Georgia Power's average cost of long-term debt); (viii) reduced the ROE used for AFUDC equity for Plant Vogtle Units 3 and 4 from 10.00% to Georgia Power's average cost of long-term debt, effective January 1, 2018; and (ix) agreed that upon Unit 3 reaching commercial operation, retail base rates would be adjusted to include carrying costs on those capital costs deemed prudent in the Vogtle Cost Settlement Agreement. The January 11, 2018 order also stated that if Plant Vogtle Units 3 and 4 are not commercially operational by June 1, 2021 and June 1, 2022, respectively, the ROE used to calculate the NCCR tariff will be further reduced by 10 basis points each month (but not lower than Georgia Power's average cost of long-term debt) until the respective unit is commercially operational. The ROE reductions negatively impacted earnings by approximately $20 million in 2016 and $25 million in 2017 and are estimated to have negative earnings impacts of approximately $120 million in 2018 and an aggregate of $585 million from 2019 to 2022. In its January 11, 2018 order, the Georgia PSC stated if other certain conditions and assumptions upon which Georgia Power's seventeenth VCM report are based do not materialize, both Georgia Power and the Georgia PSC reserve the right to reconsider the decision to continue construction.
On February 12, 2018, Georgia Interfaith Power & Light, Inc. and Partnership for Southern Equity, Inc. filed a petition appealing the Georgia PSC's January 11, 2018 order with the Fulton County Superior Court. Georgia Power believes the appeal has no merit; however, an adverse outcome in this appeal could have a material impact on Southern Company's results of operations, financial condition, and liquidity.
The IRS allocated PTCs to each of Plant Vogtle Units 3 and 4, which originally required the applicable unit to be placed in service before 2021. Under the Bipartisan Budget Act of 2018, Plant Vogtle Units 3 and 4 continue to qualify for PTCs. The nominal value of Georgia Power's portion of the PTCs is approximately $500 million per unit.
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In its January 11, 2018 order, the Georgia PSC also approved $542 million of capital costs incurred during the seventeenth VCM reporting period (January 1, 2017 to June 30, 2017). The Georgia PSC has approved seventeen VCM reports covering the periods through June 30, 2017, including total construction capital costs incurred through that date of $4.4 billion. Georgia Power expects to file its eighteenth VCM report on February 28, 2018 requesting approval of approximately $450 million of construction capital costs (before payments received under the Guarantee Settlement Agreement and the Customer Refunds) incurred from July 1, 2017 through December 31, 2017. Georgia Power's CWIP balance for Plant Vogtle Units 3 and 4 was approximately $4.8 billion as of December 31, 2017, or $3.3 billion net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.
The ultimate outcome of these matters cannot be determined at this time.
Cost and Schedule
Georgia Power's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4 with in service dates of November 2021 and November 2022, respectively, is as follows:
 (in billions)
Project capital cost forecast$7.3
Net investment as of December 31, 2017(3.4)
Remaining estimate to complete$3.9
Note: Excludes financing costs capitalized through AFUDC and is net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.
Georgia Power estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
As construction continues, challenges with management of contractors, subcontractors, and vendors, labor productivity and availability, fabrication, delivery, assembly, and installation of plant systems, structures, and components (some of which are based on new technology and have not yet operated in the global nuclear industry at this scale), or other issues could arise and change the projected schedule and estimated cost.
There have been technical and procedural challenges to the construction and licensing of Plant Vogtle Units 3 and 4 at the federal and state level and additional challenges may arise. Processes are in place that are designed to assure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the NRC that occur throughout construction. As a result of such compliance processes, certain license amendment requests have been filed and approved or are pending before the NRC. Various design and other licensing-based compliance matters, including the timely resolution of Inspections, Tests, Analyses, and Acceptance Criteria and the related approvals by the NRC, may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time.
Other Matters
As of December 31, 2017, Georgia Power had borrowed $2.6 billion related to Plant Vogtle Units 3 and 4 costs through the Loan Guarantee Agreement and a multi-advance credit facility among Georgia Power, the DOE, and the FFB, which provides for borrowings of up to $3.46 billion, subject to the satisfaction of certain conditions. On September 28, 2017, the DOE issued a conditional commitment to Georgia Power for up to approximately $1.67 billion in additional guaranteed loans under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extension approved by the DOE. Final approval and issuance of these additional loan guarantees by the DOE cannot be assured and are subject to the negotiation of definitive agreements, completion of due diligence by the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions. See Note 6 to the financial statements under "DOE Loan Guarantee Borrowings" for additional information, including applicable covenants, events of default, mandatory prepayment events, and conditions to borrowing.
The ultimate outcome of these matters cannot be determined at this time.
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Income Tax Matters
Federal Tax Reform Legislation
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation, among other things, reduces the federal corporate income tax rate to 21%, retains normalization provisions for public utility property and existing renewable energy incentives, and repeals the corporate alternative minimum tax.
For businesses other than regulated utilities, the Tax Reform Legislation allows 100% bonus depreciation of qualified property acquired and placed in service between September 28, 2017 and January 1, 2023 and phases down by 20% each year until completely phased out for qualified property placed in service after December 31, 2027. Further, the business interest deduction is limited to 30% of taxable income excluding interest, net operating loss (NOL) carryforwards, and depreciation and amortization through December 31, 2021, and thereafter to 30% of taxable income excluding interest and NOL carryforwards.
Regulated utility businesses, including the majority of the operationssome of the traditional electric operating companies, other investor-owned utilities, IPPs, municipalities, and the natural gas distribution companies, can continue deducting all business interest expense and are not eligible for bonus depreciation on capital assets acquired and placed in service after September 27, 2017. Projects with binding contracts before September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the Protecting Americans from Tax Hikes (PATH) Act.
In addition, under the Tax Reform Legislation, NOLs generated after December 31, 2017 can no longer be carried back to previous tax years but can be carried forward indefinitely, with utilization limited to 80% of taxable income of the subsequent tax year. The projected reduction of the consolidated income tax liability resulting from the tax rate reduction also delays the expected utilization of existing tax credit carryforwards.
For the year ended December 31, 2017, implementation of the Tax Reform Legislation resulted in an estimated net tax benefit of $264 million, a $0.4 billion decrease in regulatory assets, and a $6.9 billion increase in regulatory liabilities, primarily due to the impact of the reduction of the corporate income tax rate on deferred tax assets and liabilities. Also, the OCI ending balance at December 31, 2017 includes $30 million of stranded excess deferred tax balances, which will be adjusted through retained earnings in subsequent periods.
The Tax Reform Legislation is subject to further interpretation and guidance from the IRS,other load-serving entities, as well as each respective state's adoption. In addition, the regulatory treatment of certain impacts of the Tax Reform Legislation is subject to the discretion of the FERCcommercial and relevant state regulatory bodies. On January 31, 2018, SCS, on behalf of the traditional electric operating companies, filed with the FERC a reduction to the open access transmission tariff charge for 2018 to reflect the revised federal corporate income tax rate. See Note 3 to the financial statements under "Regulatory Matters" for additional information regarding the traditional electric operating companies' and the natural gas distribution utilities' rate filings to reflect the impacts of the Tax Reform Legislation.
On February 9, 2018, the Bipartisan Budget Act of 2018 was signed into law. Included in the tax extenders portion of the law were provisions extending PTCs on advanced nuclear power facilities and ITCs on qualified fuel cells. A subsidiary of PowerSecure installed fuel cells in 2017 whichindustrial customers. The PPAs are expected to qualify for approximately $80 millionprovide Southern Power with a stable source of ITCs; however,revenue during their respective terms.
Many of Southern Power's PPAs have provisions that require Southern Power or the impactcounterparty to post collateral or an acceptable substitute guarantee if (i) S&P or Moody's downgrades the credit ratings of the related tax benefits would be substantially offset by additional required payments underrespective company to an unacceptable credit rating, (ii) the applicable purchase contracts. Should Southern Company havecounterparty is not rated, or (iii) the counterparty fails to maintain a NOL in 2018, all of these ITCs may not be fully realized in 2018. See Note 3 to the financial statements under "Nuclear Construction" for additional information on the PTCs relating to advanced nuclear power facilities.
minimum coverage ratio. See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein for additional information.
Southern Power works to maintain and expand its share of the wholesale market. During 2023, Southern Power continued to be successful in remarketing up to 438 MWs of annual natural gas generation capacity to load-serving entities through several PPAs extending over the next 16 years. Market demand is being driven by load-serving entities replacing expired purchase contracts and/or retired generation, as well as planning for future growth.
Natural Gas
Southern Power's electricity sales from natural gas facilities are primarily through long-term PPAs that consist of two types of agreements. The first type, referred to as a unit or block sale, is a customer purchase from a dedicated generating unit where all or a portion of the generation from that unit is reserved for that customer. Southern Power typically has the ability to serve the unit or block sale customer from an alternate resource. The second type, referred to as requirements service, provides that Southern Power serve the customer's capacity and energy requirements from a combination of the customer's own generating units and from Southern Power resources not dedicated to serve unit or block sales. Southern Power has rights to purchase power provided by the requirements customers' resources when economically viable.
As a general matter, substantially all of the PPAs provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel or purchased power relating to the energy delivered under such PPAs. To the extent a particular generating facility does not meet the operational requirements contemplated in the PPAs, Southern Power may be responsible for excess fuel costs. With respect to fuel transportation risk, most of Southern Power's PPAs provide that the counterparties are responsible for the availability of fuel transportation to the particular generating facility.
Capacity charges that form part of the PPA payments are designed to recover fixed and variable operation and maintenance costs based on dollars-per-kilowatt year. In general, to reduce Southern Power's exposure to certain operation and maintenance costs, Southern Power has LTSAs. See Note 51 to the financial statements under "Current and Deferred Income Taxes""Long-Term Service Agreements" for additional information.
Solar and Wind
Southern Power's electricity sales from solar and wind generating facilities are also primarily through long-term PPAs; however, these PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or provide Southern Power a certain fixed price for the electricity sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Generally, under the renewable generation PPAs, the purchasing party retains the right to keep or resell the associated renewable energy credits.
Income Tax Matters
Consolidated Income Taxes
The ultimate outcomeimpact of these matters cannot be determinedcertain tax events at this time.
Bonus Depreciation
Under the Tax Reform Legislation, projects with binding contracts prior to September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the PATH Act. The PATH Act allowed for 50% bonus depreciation for 2015 through 2017, 40% bonus depreciation for 2018, and 30% bonus depreciation for 2019 and certain long-lived assets placed in service in 2020. Based on provisional estimates, bonus depreciation is expected to result in positive cash flows of approximately $870 million for the 2017 tax year and approximately $290 million for the 2018 tax year. Should Southern Company have a NOL in 2018, alland/or its other subsidiaries can, and does, affect each Registrant's ability to utilize certain tax credits. See "Tax Credits" and ACCOUNTING POLICIES – "Application of these cash flows may not be fully realized in 2018. All projected tax benefits previously receivedCritical Accounting Policies and Estimates – Accounting for bonus depreciation relatedIncome Taxes" herein and Note 10 to the Kemper IGCC were repaid in connection with third quarter 2017 estimated tax payments. Additionally, Southern Company will record an abandonment loss on its 2018 corporate income tax return, which mayfinancial statements for additional information.
II-46

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Southern Company and Subsidiary Companies 2017 Annual Report


not be fully realized should Southern Company have a NOL in 2018. See Notes 3 and 5 to the financial statements under "Kemper County Energy Facility" and "Current and Deferred Income TaxesNet Operating Loss," respectively, for additional information. The ultimate outcome of these matters cannot be determined at this time.
Tax CreditsCost of Natural Gas
The Tax Reform Legislation retained the renewable energy incentives that were included in the PATH Act. The PATH Act allows for 30% ITC for solar projects that commence construction by December 31, 2019; 26% ITC for solar projects that commence construction in 2020; 22% ITC for solar projects that commence construction in 2021; and a permanent 10% ITC for solar projects that commence construction on or after January 1, 2022. In addition, the PATH Act allows for 100% PTC for wind projects that commenced construction in 2016; 80% PTC for wind projects that commenced construction in 2017; 60% PTC for wind projects that commence construction in 2018; and 40% PTC for wind projects that commence construction in 2019. Wind projects commencing construction after 2019 will not be entitled to any PTCs. The Company has received ITCs and PTCs in connection with investments in solar, wind, and biomass facilities primarily at Southern Power and Georgia Power. See Note 1 to the financial statements under "Income and Other Taxes" and Note 5 to the financial statements under "Current and Deferred Income Taxes – Tax Credit Carryforwards" for additional information regarding the utilization and amortization of credits and the tax benefit related to basis differences.
Southern Power
In September 2017, Southern Power began a legal entity reorganization of various direct and indirect subsidiaries that own and operate substantially all of its solar facilities, including certain subsidiaries owned in partnership with various third parties. The reorganization is expected to be substantially completed in the first quarter 2018 and is expected to result in estimated tax benefits totaling between $50 million and $55 million related to certain changes in state apportionment rates and net operating loss carryforward utilization that will be recorded in the first quarter 2018. Southern Power is pursuing the sale of a 33% equity interest in the newly-formed holding company owning these solar assets. The ultimate outcome of this matter cannot be determined at this time.
Other Matters
Southern Company and its subsidiaries are involved in various other matters being litigated and regulatory matters that could affect future earnings. In addition, Southern Company and its subsidiaries are subject to certain claims and legal actions arising in the ordinary course of business. The business activities of Southern Company's subsidiaries are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements, such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters.
The ultimate outcome of such pending or potential litigation or regulatory matters cannot be predicted at this time; however, for current proceedings not specifically reported herein or in Note 3 to the financial statements, managementExcluding Atlanta Gas Light, which does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on Southern Company's financial statements. See Note 3 to the financial statements for a discussion of various other contingencies, regulatory matters, and other matters being litigated which may affect future earnings potential.
In 2016, the SEC began conducting a formal investigation of Southern Company and Mississippi Power concerning the estimated costs and expected in-service date of the Kemper County energy facility. On November 30, 2017, the SEC staff notified Southern Company that it had concluded its investigation with no recommended enforcement action.
Litigation
On January 20, 2017, a purported securities class action complaint was filed against Southern Company, certain of its officers, and certain former Mississippi Power officers in the U.S. District Court for the Northern District of Georgia, Atlanta Division, by Monroe County Employees' Retirement System on behalf of all persons who purchased shares of Southern Company's common stock between April 25, 2012 and October 29, 2013. The complaint alleges that Southern Company, certain of its officers, and certain former Mississippi Power officers made materially false and misleading statements regarding the Kemper County energy facility in violation of certain provisions under the Securities Exchange Act of 1934, as amended. The complaint seeks, among other things, compensatory damages and litigation costs and attorneys' fees. On June 12, 2017, the plaintiffs filed an amended complaint that provided additional detail about their claims, increased the purported class period by one day, and added certain
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other former Mississippi Power officers as defendants. On July 27, 2017, the defendants filed a motion to dismiss the plaintiffs' amended complaint with prejudice, to which the plaintiffs filed an opposition on September 11, 2017.
On February 27, 2017, Jean Vineyard filed a shareholder derivative lawsuit in the U.S. District Court for the Northern District of Georgia that names as defendants Southern Company, certain of its directors, certain of its officers, and certain former Mississippi Power officers. The complaint alleges that the defendants caused Southern Company to make false or misleading statements regarding the Kemper County energy facility cost and schedule. Further, the complaint alleges that the defendants were unjustly enriched and caused the waste of corporate assets. The plaintiff seeks to recover, on behalf of Southern Company, unspecified actual damages and, on her own behalf, attorneys' fees and costs in bringing the lawsuit. The plaintiff also seeks certain changes to Southern Company's corporate governance and internal processes. On March 27, 2017, the court deferred this lawsuit until 30 days after certain further action in the purported securities class action complaint discussed above.
On May 15, 2017, Helen E. Piper Survivor's Trust filed a shareholder derivative lawsuit in the Superior Court of Gwinnett County, State of Georgia and, on May 31, 2017, Judy Mesirov filed a shareholder derivative lawsuit in the U.S. District Court for the Northern District of Georgia. Each of these lawsuits names as defendants Southern Company, certain of its directors, certain of its officers, and certain former Mississippi Power officers. Each complaint alleges that the individual defendants, among other things, breached their fiduciary duties in connection with schedule delays and cost overruns associated with the construction of the Kemper County energy facility. Each complaint further alleges that the individual defendants authorized or failed to correct false and misleading statements regarding the Kemper County energy facility schedule and cost and failed to implement necessary internal controls to prevent harm to Southern Company. Each plaintiff seeks to recover, on behalf of Southern Company, unspecified actual damages and disgorgement of profits and, on its behalf, attorneys' fees and costs in bringing the lawsuit. Each plaintiff also seeks certain unspecified changes to Southern Company's corporate governance and internal processes. On August 15, 2017, these two shareholder derivative lawsuits were consolidated in the U.S. District Court for the Northern District of Georgia and the court deferred the consolidated case until 30 days after certain further action in the purported securities class action complaint discussed above.
Southern Company believes these legal challenges have no merit; however, an adverse outcome in any of these proceedings could have an impact on Southern Company's results of operations, financial condition, and liquidity. Southern Company will vigorously defend itself in these matters, the ultimate outcome of which cannot be determined at this time.
Investments in Leveraged Leases
A subsidiary of Southern Holdings has several leveraged lease agreements, with original terms ranging up to 45 years, which relate to international and domestic energy generation, distribution, and transportation assets. Southern Company receives federal income tax deductions for depreciation and amortization, as well as interest on long-term debt related to these investments. Southern Company reviews all important lease assumptions at least annually, or more frequently if events or changes in circumstances indicate that a change in assumptions has occurred or may occur. These assumptions include the effective tax rate, the residual value, the credit quality of the lessees, and the timing of expected tax cash flows. See Note 1 to the financial statements under "Leveraged Leases" for additional information.
The ability of the lessees to make required payments to the Southern Holdings subsidiary is dependent on the operational performance of the assets. In the last six months of 2017, the financial and operational performance of one of the lessees and the associated generation assets has raised significant concerns about the short-term ability of the generation assets to produce cash flows sufficient to support ongoing operations and the lessee's contractual obligations and its ability to make the remaining semi-annual lease payments to the Southern Holdings subsidiary beginning in June 2018. These operational challenges may also impact the expected residual value of the assets at the end of the lease term in 2047. If the June 2018 (or any future) lease payment is not paid in full, the Southern Holdings subsidiary may be unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. Failure to make the required payment to the debtholders would represent an event of default that would give the debtholders the right to foreclose on, and take ownership of, the generation assets from the Southern Holdings subsidiary, in effect terminating the lease and resulting in the write-off of the related lease receivable which had a balance of approximately $86 million as of December 31, 2017. Southern Company has evaluated the recoverability of the lease receivable and the expected residual value of the generation assets at the end of the lease under various scenarios and has concluded that its investment in the leveraged lease is not impaired as of December 31, 2017. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to make the required lease payments, including the lease payment due in June 2018. The ultimate outcome of this matter cannot be determined at this time.
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Natural Gas Storage
A wholly-owned subsidiary of Southern Company Gas owns and operates asell natural gas storage facility consisting of two salt dome caverns in Louisiana. Periodic integrity tests are required in accordance with rules of the Louisiana Department of Natural Resources (DNR). In August 2017, in connection with an ongoing integrity project, updated seismic mapping indicated the proximity of one of the caverns to the edge of the salt dome may be less than the required minimum and could result in Southern Company Gas retiring the cavern early. At December 31, 2017, the facility's property, plant, and equipment had a net book value of $112 million, of which the cavern itself represents approximately 20%. A potential early retirement of this cavern is dependent upon several factors including compliance with an order from the Louisiana DNR detailing the requirements to place the cavern back in service, which includes, among other things, obtaining core samples to determine the composition of the sheath surrounding the edge of the salt dome.
The cavern continues to maintain its pressures and overall structural integrity. Southern Company Gas intends to monitor the cavern and comply with the Louisiana DNR order through 2020 and place the cavern back in service in 2021. These events were considered in connection with Southern Company Gas' annual long-lived asset impairment analysis, which determined there was no impairment as of December 31, 2017. Any changes in results of monitoring activities, rates at which expiring capacity contracts are re-contracted, timing of placing the cavern back in service, or Louisiana DNR requirements could trigger impairment. Further, early retirement of the cavern could trigger impairment of other long-lived assets associated with the natural gas storage facility. The ultimate outcome of this matter cannot be determined at this time, but could have a significant impact on Southern Company's financial statements.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
Southern Company prepares its consolidated financial statements in accordance with GAAP. Significant accounting policies are described in Note 1 to the financial statements. In the application of these policies, certain estimates are made that may have a material impact on Southern Company's results of operations and related disclosures. Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed the following critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Utility Regulation
Southern Company's traditional electric operating companies and natural gas distribution utilities, which collectively comprised approximately 86% of Southern Company's total operating revenues for 2017, are subject to retail regulation by their respective state PSCs or other applicable state regulatory agencies and wholesale regulation by the FERC. These regulatory agencies set the rates the traditional electric operating companies andend-use customers, the natural gas distribution utilities are permittedrates include provisions to charge customers based on allowableadjust billings for fluctuations in natural gas costs. Therefore, gas costs including a reasonable ROE. As a result,recovered through natural gas revenues generally equal the traditional electric operating companiesamount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities apply accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards has a further effect on the Company's financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the traditional electric operating companies and the natural gas distribution utilities; therefore, the accounting estimates inherent in specific costs such as depreciation, AROs, and pension and other postretirement benefits have less of a direct impact on the Company's results of operations and financial condition than they would on a non-regulated company.
As reflected in Note 1 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact the amounts of such regulatory assets and liabilities and could adversely impact the Company's financial statements.
Kemper County Energy Facility Rate Recovery
For periods prior to the second quarter 2017, significant accounting estimates included Kemper County energy facility estimated construction costs, project completion date, and rate recovery. Mississippi Power recorded total pre-tax charges to income related
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to the Kemper County energy facility of $428 million ($264 million after tax) in 2016, $365 million ($226 million after tax) in 2015, $868 million ($536 million after tax) in 2014, and $1.2 billion ($729 million after tax) in prior years.
As a result of the Mississippi PSC's June 21, 2017 stated intent to issue an order (which occurred on July 6, 2017) directing Mississippi Power to pursue a settlement under which the Kemper County energy facility would be operated as a natural gas plant rather than an IGCC plant, as well as Mississippi Power's June 28, 2017 suspension of the operation and start-up of the gasifier portion of the Kemper County energy facility, the estimated construction costs and project completion date are no longer considered significant accounting estimates.
Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, Mississippi Power recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine. During the third and fourth quarters of 2017, Mississippi Power recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during the suspension period prior to conclusion of the Kemper Settlement Docket, as well as a charge of $78 million associated with the Kemper Settlement Agreement.
In the aggregate, since the Kemper County energy facility project started, Mississippi Power has incurred charges of $6.20 billion ($4.14 billion after tax) through December 31, 2017. See Note 14 to the financial statements for additional information on the individual charges by quarter.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges, and no longer represents a critical accounting estimate.
See Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
Accounting for Income Taxes
The consolidated income tax provision and deferred income tax assets and liabilities, as well as any unrecognized tax benefits and valuation allowances, require significant judgment and estimates. These estimates are supported by historical tax return data, reasonable projections of taxable income, and interpretations of applicable tax laws and regulations across multiple taxing jurisdictions. The effective tax rate reflects the statutory tax rates and calculated apportionments for the various states in which the Southern Company system operates.
Southern Company files a consolidated federal income tax return and various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. Certain deductions and credits can be limited at the consolidated or combined level resulting in NOL and tax credit carryforwards that would not otherwise result on a stand-alone basis. Utilization of NOL and tax credit carryforwards and the assessment of valuation allowances are based on significant judgment and extensive analysis of the Company's current financial position and result of operations, including currently available information about future years, to estimate when future taxable income will be realized.
Current and deferred state income tax liabilities and assets are estimated based on laws of multiple states that determine the income to be apportioned to their jurisdictions. States utilize various formulas to calculate the apportionment of taxable income, primarily using sales, assets, or payroll within the jurisdiction compared to the consolidated totals. In addition, each state varies as to whether a stand-alone, combined, or unitary filing methodology is required. The calculation of deferred state taxes considers apportionment factors and filing methodologies that are expected to apply in future years. The apportionments and methodologies which are ultimately finalized in a manner inconsistent with expectations could have a material effect on Southern Company's financial statements.
Given the significant judgment involved in estimating NOL and tax credit carryforwards and multi-state apportionments for all subsidiaries, Southern Company considers state deferred income tax liabilities and assets to be critical accounting estimates.
Federal Tax Reform Legislation
Following the enactment of the Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, Southern Company considers all amounts recorded in the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. Southern Company is awaiting additional guidance from industry and income tax authorities in order
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to finalize its accounting. The ultimate impact of the Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Notes 3 and 5 to the financial statements under "Regulatory Matters" and "Current and Deferred Income Taxes," respectively, for additional information.
Asset Retirement Obligations
AROs are computed as the fair value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities.
The liability for AROs primarily relates to facilities that are subject to the CCR Rule, principally ash ponds, and the decommissioning of the Southern Company system's nuclear facilities – Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 and 2. In addition, the Southern Company system has retirement obligations related to various landfill sites, asbestos removal, mine reclamation, land restoration related to solar and wind facilities, and disposal of polychlorinated biphenyls in certain transformers. The Southern Company system also has identified retirement obligations related to certain electric transmission and distribution facilities, certain wireless communication towers, property associated with the Southern Company system's rail lines and natural gas pipelines, and certain structures authorized by the U.S. Army Corps of Engineers. However, liabilities for the removal of these assets have not been recorded as the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.
The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure. As further analysis is performed and closure details are developed, the traditional electric operating companies will continue to periodically update these cost estimates as necessary. See FUTURE EARNINGS POTENTIAL – "Environmental MattersEnvironmental Laws and RegulationsCoal Combustion Residuals" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" and "Nuclear Decommissioning" for additional information.
Given the significant judgment involved in estimating AROs, Southern Company considers the liabilities for AROs to be critical accounting estimates.
Pension and Other Postretirement Benefits
Southern Company's calculation of pension and other postretirement benefits expense is dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term return on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the Company believes that the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect its pension and other postretirement benefits costs and obligations.
Key elements in determining Southern Company's pension and other postretirement benefit expense are the expected long-term return on plan assets and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. The expected long-term return on pension and other postretirement benefit plan assets is based on Southern Company's investment strategy, historical experience, and expectations for long-term rates of return that consider external actuarial advice. Southern Company determines the long-term return on plan assets by applying the long-term rate of expected returns on various asset classes to Southern Company's target asset allocation. For purposes of determining its liability related to the pension and other postretirement benefit plans, Southern Company discounts the future related cash flows using a single-point discount rate for each plan developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. For 2015 and prior years, Southern Company computed the interest cost component of its net periodic pension and other postretirement benefit plan expense using the same single-point discount rate. Beginning in 2016, Southern Company adopted a full yield curve approach for calculating the interest cost component whereby the discount rate for each year is applied to the liability for that specific year. As a result, the interest cost
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component of net periodic pension and other postretirement benefit plan expense decreased by approximately $96 million in 2016.
The following table illustrates the sensitivity to changes in Southern Company's long-term assumptions with respect to the assumed discount rate, the assumed salaries, and the assumed long-term rate of return on plan assets:
Change in AssumptionIncrease/(Decrease) in Total Benefit Expense for 2018Increase/(Decrease) in Projected Obligation for Pension Plan at December 31, 2017Increase/(Decrease) in Projected Obligation for Other Postretirement Benefit Plans at December 31, 2017
(in millions)
25 basis point change in discount rate$40/$(38)$504/$(476)$68/$(65)
25 basis point change in salaries$24/$(23)$119/$(115)$–/$–
25 basis point change in long-term return on plan assets$33/$(33)N/AN/A
N/A – Not applicable
utilities. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information regarding pension and other postretirement benefits.
Goodwill and Other Intangible Assets
The acquisition methodinformation. Cost of accounting requires the assets acquired and liabilities assumed to be recordednatural gas at the date of acquisition at their respective estimated fair values. Southern Company recognizes goodwill asnatural gas distribution utilities represented 83.5% of the acquisition date, astotal cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion, a residual over the fair valuesdecrease of the identifiable net assets acquired. Goodwill is tested for impairment on an annual basis$1.4 billion, or 45.3%, in the fourth quarter of the year as well as on an interim basis as events and changes2023 compared to 2022, which reflects lower gas cost recovery in circumstances occur. Primarily2023 as a result of the acquisitionsa 58.8% decrease in natural gas prices compared to 2022.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses increased $18 million, or 1.5%, in 2023 compared to 2022. The increase was primarily due to increases of Southern Company Gas$70 million in compensation and PowerSecure in 2016, goodwill totaled approximately $6.3 billion at December 31, 2017.
Definite-lived intangible assets acquired are amortized over the estimated useful lives of the respective assets to reflect the pattern in which the economic benefits of the intangible assets are consumed. Whenever events or changes in circumstances indicate that the carrying amount of the intangible assets may not be recoverable, the intangible assets will be reviewed for impairment. Primarily as a result of the acquisitions of Southern Company Gas and PowerSecure and PPA fair value adjustments resulting from Southern Power's acquisitions, other intangible assets, net of amortization totaled approximately $873$20 million at December 31, 2017.
The judgments made in determining the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can significantly impact Southern Company's results of operations. Fair values and useful lives are determined based on, among other factors, the expected future period of benefit of the asset, the various characteristics of the asset, and projected cash flows. As the determination of an asset's fair value and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, Southern Company considers these estimates to be critical accounting estimates.
See Note 1 to the financial statements under "Goodwill and Other Intangible Assets and Liabilities" for additional information regarding Southern Company's goodwill and other intangible assets and Note 12 to the financial statements for additional information related to Southern Company's recent acquisitions and proposed dispositions.
Derivatives and Hedging Activities
Derivative instruments are recorded on the balance sheets as either assets or liabilities measured at their fair value, unless the transactions qualify for the normal purchases or normal sales scope exception and are instead subject to traditional accrual accounting. For those transactions that do not qualify asenergy service contracts, partially offset by a normal purchase or normal sale, changesdecrease of $60 million in the derivatives' fair values are recognized concurrently in earnings unless specific hedge accounting criteria are met. If the derivatives meet those criteria, derivative gains and losses offset related results of the hedged item in the income statement in the case of a fair value hedge, or gains and losses are deferred in OCI until the hedged transaction affects earnings in the case of a cash flow hedge. Certain subsidiaries of Southern Company enter into energy-related derivatives that are designated as regulatory hedges where gains and losses are initially recorded as regulatory liabilities and assets and then are included in fuel expense as the underlying fuel is used in operations and ultimately recoveredexpenses passed through billings to customers.
Southern Company uses derivative instruments to reduce the impact to the results of operations due to the risk of changes in the price of natural gas, to manage fuel hedging programs per guidelines of state regulatory agencies, and to mitigate residual changes in the price of electricity, weather, interest rates, and foreign currency exchange rates. The fair value of commodity derivative
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instruments used to manage exposure to changing prices reflects the estimated amounts that Southern Company would receive or pay to terminate or close the contracts at the reporting date. To determine the fair value of the derivative instruments, Southern Company utilizes market data or assumptions that market participants would use in pricing the derivative asset or liability, including assumptions about risk and the risks inherent in the inputs of the valuation technique.
Southern Company classifies derivative assets and liabilities based on the lowest level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy. The determination of the fair value of the derivative instruments incorporates various required factors. These factors include:
the creditworthiness of the counterparties involved and the impact of credit enhancements (such as cash deposits and letters of credit);
events specific to a given counterparty; and
the impact of Southern Company's nonperformance risk on its liabilities.
Given the assumptions used in pricing the derivative asset or liability, Southern Company considers the valuation of derivative assets and liabilities a critical accounting estimate. See FINANCIAL CONDITION AND LIQUIDITY – "Market Price Risk" herein for more information.
Contingent Obligations
Southern Company is subject to a number of federal and state laws and regulations as well as other factors and conditions that subject it to environmental, litigation, income tax, and other risks. See FUTURE EARNINGS POTENTIAL herein and Note 3 to the financial statements for more information regarding certain of these contingencies. Southern Company periodically evaluates its exposure to such risks and records reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable and records a tax asset or liability if it is more likely than not that a tax position will be sustained. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect Southern Company's results of operations, cash flows, or financial condition.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers primarily related to bad debt and energy efficiency programs at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of Southern Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity or natural gas without a defined contractual term, as well as longer-term contractual commitments, including PPAs and non-derivative natural gas asset management and optimization arrangements.
Southern Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as certain PPAs, energy-related derivatives, and alternative revenue programs, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed or presented separately from revenues under ASC 606 on Southern Company's financial statements. Southern Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. Southern Company applied the modified retrospective method of adoption effective January 1, 2018. Southern Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
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Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged and there is no change to the accounting for existing leveraged leases. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and Southern Company will adopt the new standard effective January 1, 2019.
Southern Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, Southern Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to cellular towers and PPAs where certain of Southern Company's subsidiaries are the lessee and to land and outdoor lighting where certain of Southern Company's subsidiaries are the lessor. The traditional electric operating companies are currently analyzing pole attachment agreements, and a lease determination has not been made at this time. While Southern Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on Southern Company's balance sheet.
Other
In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18). ASU 2016-18 eliminates the need to reflect transfers between cash and restricted cash in operating, investing, and financing activities in the statement of cash flows. Upon adoption, the net change in cash and cash equivalents during the period will include amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, and will be applied retrospectively to each period presented. Southern Company adopted ASU 2016-18 effective January 1, 2018 with no material impact on its financial statements.
On January 26, 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-04). ASU 2017-04 removes the requirement to compare the implied fair value of goodwill with the carrying amount as part of Step 2 of the goodwill impairment test. Under the new standard, the goodwill impairment loss will be measured as the excess of a reporting unit's carrying amount over its fair value, not exceeding the total amount of goodwill allocated to that reporting unit, which may increase the frequency of goodwill impairment charges if a future goodwill impairment test does not pass the Step 1 evaluation. ASU 2017-04 is effective prospectively for periods beginning on or after December 15, 2019, with early adoption permitted. Southern Company adopted ASU 2017-04 effective January 1, 2018 with no impact on its financial statements.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in Southern Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. Southern Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. Southern Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
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FINANCIAL CONDITION AND LIQUIDITY
Overview
Earnings in all periods presented were negatively affected by charges associated with the Kemper IGCC; however, Southern Company's financial condition remained stable at December 31, 2017.
The Southern Company system's cash requirements primarily consist of funding ongoing operations, common stock dividends, capital expenditures, and debt maturities. The Southern Company system's capital expenditures and other investing activities include investments to meet projected long-term demand requirements, including to build new electric generation facilities, to maintain existing electric generation facilities, to comply with environmental regulations including adding environmental modifications to certain existing electric generating units, to expand and improve electric transmission and distribution facilities, to update and expand natural gas distribution systems, and for restoration following major storms. Operating cash flows provide a substantial portion of the Southern Company system's cash needs. For the three-year period from 2018 through 2020, Southern Company's projected common stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows. Southern Company plans to finance future cash needs in excess of its operating cash flows primarily by accessing borrowings from financial institutions and through debt and equity issuances in the capital markets. Southern Company intends to continue to monitor its access to short-term and long-term capital markets as well as bank credit arrangements to meet future capital and liquidity needs.utilities. See "Sources of Capital," "Financing Activities," and "Capital Requirements and Contractual Obligations" herein for additional information.
Southern Company's investments in the qualified pension plans and the nuclear decommissioning trust funds increased in value as of December 31, 2017 as compared to December 31, 2016. No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plans are anticipated during 2018. See "Contractual Obligations" herein and Notes 1 andNote 2 to the financial statements under "Nuclear Decommissioning" and "Pension Plans," respectively,"Southern Company Gas" for additional information.
Net cash provided from operating activities
II-16

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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Depreciation and Amortization
Depreciation and amortization increased $23 million, or 4.1%, in 2017 totaled $6.4 billion, an increase of $1.5 billion from 2016.2023 compared to 2022. The increase in net cash provided from operating activities was primarily due to increases of $1.2 billion related to operating activities of Southern Company Gas, which was acquired on July 1, 2016, and $1.0 billion related to voluntary contributions tocontinued infrastructure investments at the qualified pension plan in 2016, partially offset by the timing of vendor payments. Net cash provided from operating activities in 2016 totaled $4.9 billion, a decrease of $1.4 billion from 2015. Significant changes in operating cash flow for 2016 as compared to 2015 included approximately $1.0 billion of voluntary contributions to the qualified pension plan in 2016 and a $1.2 billion increase in unutilized ITCs and PTCs.
Net cash used for investing activities in 2017, 2016, and 2015 totaled $7.2 billion, $20.0 billion, and $7.3 billion, respectively. The cash used for investing activities in 2017 was primarily due to the traditional electric operating companies' installation of equipment to comply with environmental standards and construction of electric generation, transmission, and distribution facilities, capital expenditures for Southern Company Gas' infrastructure replacement programs, and Southern Power's renewable acquisitions. The cash used for investing activities in 2016 was primarily due to the closing of the Merger, the acquisition of PowerSecure, Southern Company Gas' investment in SNG, the traditional electric operating companies' construction of electric generation, transmission, and distribution facilities and installation of equipment at electric generating facilities to comply with environmental standards, and Southern Power's acquisitions and construction of renewable facilities and a natural gas facility. The cash used for investing activities in 2015 was primarily due to the traditional electric operating companies' gross property additions for installation of equipment at electric generating facilities to comply with environmental standards and construction of electric generation, transmission, and distribution facilities, Southern Power's acquisitions of solar facilities, and purchases of nuclear fuel.
Net cash provided from financing activities totaled $1.0 billion in 2017 primarily due to net issuances of long-term and short-term debt, partially offset by common stock dividend payments. Net cash provided from financing activities totaled $15.7 billion in 2016 primarily due to issuances of long-term debt and common stock associated with completing the Merger and funding the subsidiaries' continuous construction programs, Southern Power's acquisitions, and Southern Company Gas' investment in SNG, partially offset by redemptions of long-term debt and common stock dividend payments. Net cash provided from financing activities totaled $1.7 billion in 2015 primarily due to issuances of long-term debt and common stock and an increase in short-term debt, partially offset by common stock dividend payments and redemptions of long-term debt and preferred and preference stock. Fluctuations in cash flow from financing activities vary from year to year based on capital needs and the maturity or redemption of securities.
Significant balance sheet changes in 2017 included decreases of $7.3 billion and $0.8 billion in accumulated deferred income taxes and deferred charges related to income taxes, respectively, and an increase of $7.0 billion in deferred credits related to
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income taxes primarily resulting from the impacts of the Tax Reform Legislation; an increase of $1.4 billion in total property, plant, and equipment primarily related to the traditional electric operating companies' installation of equipment to comply with environmental standards and construction of electric generation, transmission, and distribution facilities, Southern Company Gas' infrastructure replacement programs, and Southern Power's renewable acquisitions, largely offset by the $2.8 billion write-down of the gasification portions of the Kemper County energy facility and payments of $1.7 billion received by Georgia Power under the Guarantee Settlement Agreement; an increase of $3.1 billion in long-term debt (including amounts due within one year) primarily to fund the Southern Company system's continuous construction programs and for general corporate purposes; and a decrease of $1.1 billion in total stockholder's equity primarily related to the Kemper County energy facility charges, partially offset by the issuance of additional shares of common stock.utilities. See FUTURE EARNINGS POTENTIAL – "Income Tax MattersFederal Tax Reform Legislation" and "Financing Activities" herein and Note 32 to the financial statements under "Nuclear Construction""Southern Company Gas – Infrastructure Replacement Programs and "Kemper County Energy Facility"Capital Projects" for additional information.
At the end of 2017, the market price of Southern Company's common stock was $48.09 per share (based on the closing price as reported on the New York Stock Exchange) and the book value was $23.99 per share, representing a market-to-book value ratio of 201%Taxes Other Than Income Taxes
Taxes other than income taxes decreased $20 million, or 7.1%, in 2023 compared to $49.19, $25.00,2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and 197%, respectively, at the endproperty taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of 2016.
Southern Company's consolidated ratio of common equityan agreement to total capitalization plus short-term debt was 31.5% and 33.3% at December 31, 2017 and 2016, respectively.sell two natural gas storage facilities. See Note 615 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $47 million, or 17.9%, in 2023 compared to 2022. The increase reflects approximately $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
SourcesIncome Taxes
Income taxes increased $31 million, or 17.2%, in 2023 compared to 2022. The increase was primarily due to $33 million of Capital
Southern Company intendstax benefit in 2022 related to meet its future capital needs through operating cash flows, borrowings from financial institutions, and debt and equity issuances in the capital markets. Equity capital can be provided from any combination ofimpairment charges associated with the Company's stock plans, private placements, or public offerings. The amount and timing of additional equity and debt issuances in 2018, as well as in subsequent years, will be contingent on Southern Company's investment opportunities and the Southern Company system's capital requirements and will depend upon prevailing market conditions and other factors. See "Capital Requirements and Contractual Obligations" herein for additional information.
Except as described herein, the traditional electric operating companies, Southern Power, and Southern Company Gas plan to obtain the funds required for construction and other purposes from operating cash flows, external security issuances, borrowings from financial institutions, and equity contributions or loans from Southern Company. Southern Power also plans to utilize tax equity partnership contributions, as well as funds resulting from any potential sale of a 33% equity interest in a newly-formed holding company that owns substantially all of its solar assets, if completed. Southern Company Gas also plans to utilize the proceeds from the pending asset sales of two of its natural gas distribution utilities. However, the amount, type,storage facilities and timing of any future financings, if needed, will depend upon prevailing market conditions, regulatory approval, and other factors. See FUTURE EARNINGS POTENTIAL – "General" herein for additional information.
In addition, in 2014, Georgia Power entered into the Loan Guarantee Agreement with the DOE, under which the proceeds of borrowings may be usedhigher taxes related to reimburse Georgia Power for Eligible Project Costs incurred in connection with its construction of Plant Vogtle Units 3 and 4. Under the Loan Guarantee Agreement, the DOE agreed to guarantee borrowings of up to $3.46 billion (not to exceed 70% of Eligible Project Costs) to be madeincreased earnings, partially offset by Georgia Power under a multi-advance credit facility (FFB Credit Facility) among Georgia Power, the DOE, and the FFB. As of December 31, 2017, Georgia Power had borrowed $2.6 billion under the FFB Credit Facility. On July 27, 2017, Georgia Power entered into an amendmentapproximately $24 million related to the Loan Guarantee Agreement, which provides that further advances are conditioned upon the DOE's approval of any agreements entered into in replacement of the Vogtle 3regulatory disallowances at Nicor Gas. See Notes 2 and 4 Agreement and satisfaction of certain other conditions.
On September 28, 2017, the DOE issued a conditional commitment to Georgia Power for up to approximately $1.67 billion of additional guaranteed loans under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extension approved by the DOE. Final approval and issuance of these additional loan guarantees by the DOE cannot be assured and are subject to the negotiation of definitive agreements, completion of due diligence by the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions. See Note 615 to the financial statements under "DOE Loan Guarantee Borrowings" for additional information regarding the Loan Guarantee Agreement, including applicable covenants, events of default, mandatory prepayment events,"Southern Company Gas" and additional conditions to borrowing. Also see Note 3 to the financial statements under "Nuclear Construction" for additional information regarding Plant Vogtle Units 3 and 4.
The issuance of securities by the traditional electric operating companies and Nicor Gas is generally subject to the approval of the applicable state PSC or other applicable state regulatory agency. The issuance of all securities by Mississippi Power and short-term securities by Georgia Power is generally subject to regulatory approval by the FERC. Additionally, with respect to the public offering of securities, Southern Company and certain of its subsidiaries file registration statements with the SEC under the Securities Act of 1933, as amended (1933 Act). The amounts of securities authorized by the appropriate regulatory authorities, as
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Southern Company and Subsidiary Companies 2017 Annual Report


well as the securities registered under the 1933 Act, are continuously monitored and appropriate filings are made to ensure flexibility in the capital markets.
Southern Company, each traditional electric operating company, and Southern Power generally obtain financing separately without credit support from any affiliate. The Southern Company system does not maintain a centralized cash or money pool. Therefore, funds of each company are not commingled with funds of any other company in the Southern Company system.
In addition, Southern Company Gas Capital obtains external financing for Southern Company Gas and its subsidiaries, other than Nicor Gas, which obtains financing separately without credit support from any affiliates. Nicor Gas' commercial paper program supports its working capital needs as Nicor Gas is not permitted to make money pool loans to affiliates. All of the other Southern Company Gas subsidiaries benefit from Southern Company Gas Capital's commercial paper program.
See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
As of December 31, 2017, Southern Company's current liabilities exceeded current assets by $3.5 billion, due to $3.9 billion of long-term debt that is due within one year (comprised of approximately $1.0 billion at the parent company, $0.9 billion at Georgia Power, $1.0 billion at Mississippi Power, $0.8 billion at Southern Power, and $0.2 billion at Southern Company Gas) and $2.4 billion of notes payable (comprised of approximately $0.6 billion at the parent company, $0.2 billion at Georgia Power, $0.1 billion at Southern Power, and $1.5 billion at Southern Company Gas). To meet short-term cash needs and contingencies, the Southern Company system has substantial cash flow from operating activities and access to capital markets and financial institutions. Southern Company, the traditional electric operating companies, Southern Power, and Southern Company Gas intend to utilize operating cash flows, as well as commercial paper, lines of credit, bank notes, and securities issuances, as market conditions permit, as well as, under certain circumstances for the traditional electric operating companies, Southern Power, and Southern Company Gas, equity contributions and/or loans from Southern Company to meet their short-term capital needs.
At December 31, 2017, Southern Company and its subsidiaries had approximately $2.1 billion of cash and cash equivalents. Committed credit arrangements with banks at December 31, 2017 were as follows:
 Expires   Executable Term Loans Expires Within One Year
Company2018
2019
2020 2022 Total Unused 
One
Year
 
Two
Years
 Term Out No Term Out
 (in millions)
Southern Company(a)
$
 $
 $
 $2,000
 $2,000
 $1,999
 $
 $
 $
 $
Alabama Power35
 
 500
 800
 1,335
 1,335
 
 
 
 35
Georgia Power
 
 
 1,750
 1,750
 1,732
 
 
 
 
Gulf Power30
 25
 225
 
 280
 280
 45
 
 20
 10
Mississippi Power100
 
 
 
 100
 100
 
 
 
 100
Southern Power Company(b)

 
 
 750
 750
 728
 
 
 
 
Southern Company Gas(c)

 
 
 1,900
 1,900
 1,890
 
 
 
 
Other30
 
 
 
 30
 30
 20
 
 20
 10
Southern Company Consolidated$195
 $25
 $725
 $7,200
 $8,145
 $8,094
 $65
 $
 $40
 $155
(a)Represents the Southern Company parent entity.
(b)Does not include Southern Power's $120 million continuing letter of credit facility for standby letters of credit expiring in 2019, of which $19 million remains unused at December 31, 2017.
(c)Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $1.4 billion of these arrangements. Southern Company Gas' committed credit arrangements also include $500 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas.
See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
In May 2017, Southern Company, Alabama Power, Georgia Power, and Southern Power Company each amended certain of their multi-year credit arrangements, which, among other things, extended the maturity dates from 2020 to 2022. Southern Company and Southern Power Company increased their borrowing ability under these arrangements to $2.0 billion from $1.25 billion and to $750 million from $600 million, respectively. Southern Company also terminated its $1.0 billion facility maturing in 2018.
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Also in May 2017, Southern Company Gas Capital and Nicor Gas terminated their existing credit arrangements for $1.3 billion and $700 million, respectively, which were to mature in 2017 and 2018, and entered into a new multi-year credit arrangement with $1.4 billion and $500 million currently allocated to Southern Company Gas Capital and Nicor Gas, respectively, maturing in 2022. Pursuant to the new multi-year credit arrangement, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. In September 2017, Alabama Power also amended its $500 million multi-year credit arrangement, which, among other things, extended the maturity date from 2018 to 2020. In November 2017, Gulf Power amended $195 million of its multi-year credit arrangements to extend the maturity dates from 2017 and 2018 to 2020 and Mississippi Power amended its one-year credit arrangements in an aggregate amount of $100 million to extend the maturity dates from 2017 to 2018.
Most of these bank credit arrangements, as well as the term loan arrangements of Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Power Company, contain covenants that limit debt levels and contain cross-acceleration or cross-default provisions to other indebtedness (including guarantee obligations) that are restricted only to the indebtedness of the individual company. Such cross-default provisions to other indebtedness would trigger an event of default if the applicable borrower defaulted on indebtedness or guarantee obligations over a specified threshold. Such cross-acceleration provisions to other indebtedness would trigger an event of default if the applicable borrower defaulted on indebtedness, the payment of which was then accelerated. At December 31, 2017, Southern Company, the traditional electric operating companies, Southern Power Company, Southern Company Gas, and Nicor Gas were in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowings.
Subject to applicable market conditions, Southern Company and its subsidiaries expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, Southern Company and its subsidiaries may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
A portion of the unused credit with banks is allocated to provide liquidity support to the revenue bonds of the traditional electric operating companies and the commercial paper programs of Southern Company, the traditional electric operating companies, Southern Power Company, Southern Company Gas, and Nicor Gas. The amount of variable rate revenue bonds of the traditional electric operating companies outstanding requiring liquidity support as of December 31, 2017 was approximately $1.5 billion as compared to $1.9 billion at December 31, 2016. In addition, at December 31, 2017, the traditional electric operating companies had approximately $714 million of revenue bonds outstanding that were required to be remarketed within the next 12 months. Subsequent to December 31, 2017, $50 million of these revenue bonds of Mississippi Power which were in a long-term interest rate mode were remarketed in an index rate mode.
At December 31, 2017, Pivotal Utility Holdings, Inc., a subsidiary of Southern Company Gas, had $200 million of gas facility revenue bonds outstanding. The Elizabethtown Gas asset sale agreement requires that bonds representing $180 million of the total that are currently eligible for redemption at par be redeemed on or prior to consummation of the sale. See FUTURE EARNINGS POTENTIAL – "General" herein and Note 6 to the financial statements under "Gas Facility Revenue Bonds" for additional information.
Southern Company, the traditional electric operating companies (other than Mississippi Power), Southern Power Company, Southern Company Gas, and Nicor Gas make short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above. Short-term borrowings are included in notes payable in the balance sheets.
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Southern Company and Subsidiary Companies 2017 Annual Report


Details of short-term borrowings were as follows:
 Short-term Debt at the End of the Period 
Short-term Debt During the Period (*)
 Amount Outstanding Weighted Average Interest Rate Average Amount Outstanding Weighted Average Interest Rate Maximum Amount Outstanding
 (in millions)   (in millions)   (in millions)
December 31, 2017:         
Commercial paper$1,832
 1.8% $2,117
 1.3% $2,946
Short-term bank debt607
 2.3% 555
 2.1% 1,020
Total$2,439
 1.9% $2,672
 1.5%  
December 31, 2016:         
Commercial paper$1,909
 1.1% $976
 0.8% $1,970
Short-term bank debt123
 1.7% 176
 1.7% 500
Total$2,032
 1.1% $1,152
 1.1%  
December 31, 2015:         
Commercial paper$740
 0.7% $842
 0.4% $1,563
Short-term bank debt500
 1.4% 444
 1.1% 795
Total$1,240
 0.9% $1,286
 0.5%  
(*)Average and maximum amounts are based upon daily balances during the 12-month periods ended December 31, 2017, 2016, and 2015.
In addition to the short-term borrowings of Southern Power Company included in the table above, at December 31, 2016 and 2015, Southern Power Company subsidiaries had credit agreements (Project Credit Facilities) assumed with the acquisition of certain solar facilities, which were non-recourse to Southern Power Company, the proceeds of which were used to finance project costs related to such solar facilities. The Project Credit Facilities were fully repaid in January 2017. For the year ended December 31, 2016, the Project Credit Facilities had a maximum amount outstanding of $828 million and an average amount outstanding of $566 million at a weighted average interest rate of 2.1% and had total amounts outstanding of $209 million at a weighted average interest rate of 2.1% at December 31, 2016. For the year ended December 31, 2015, the Project Credit Facilities had a maximum amount outstanding of $137 million and an average amount outstanding of $13 million at a weighted average interest rate of 2.0% and had total amounts outstanding of $137 million at a weighted average interest rate of 2.0% at December 31, 2015.
Furthermore, in connection with the acquisition of a solar facility in July 2016, a subsidiary of Southern Power Company assumed a $217 million construction loan, which was fully repaid in September 2016. During this period, the credit agreement had a maximum amount outstanding of $217 million and an average amount outstanding of $137 million at a weighted average interest rate of 2.2%.
The Company believes the need for working capital can be adequately met by utilizing commercial paper programs, lines of credit, bank term loans, and operating cash flows.
Financing Activities
During 2017, Southern Company issued approximately 14.6 million shares of common stock primarily through employee equity compensation plans and received proceeds of approximately $659 million.
In addition, during the second and third quarters of 2017, Southern Company issued a total of approximately 2.7 million shares of common stock through at-the-market issuances pursuant to sales agency agreements related to Southern Company's continuous equity offering program and received cash proceeds of approximately $134 million, net of $1.1 million in fees and commissions.
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The following table outlines the long-term debt financing activities for Southern Company and its subsidiaries for the year ended December 31, 2017:
Company
Senior
Note
Issuances
 
Senior
Note
Maturities
and
Redemptions
 
Revenue
Bond
Issuances and
Reofferings
of Purchased
Bonds
 
Revenue
Bond
Maturities, Redemptions,
 and Repurchases
 
Other
Long-Term
Debt
Issuances
 
Other
Long-Term
Debt
Redemptions
and
Maturities(a)
 (in millions)
Southern Company(b)
$300
 $400
 $
 $
 $950
 $400
Alabama Power1,100
 525
 
 36
 
 
Georgia Power1,350
 450
 65
 65
 370
 17
Gulf Power300
 85
 
 
 6
 
Mississippi Power
 35
 
 
 40
 962
Southern Power525
 500
 
 
 43
 18
Southern Company Gas(c)
450
 
 
 
 400
 22
Other
 
 
 
 
 15
Elimination(d)

 
 
 
 (40) (602)
Southern Company Consolidated$4,025
 $1,995
 $65
 $101
 $1,769
 $832
(a)Includes reductions in capital lease obligations resulting from cash payments under capital leases.
(b)Represents the Southern Company parent entity.
(c)The senior notes were issued by Southern Company Gas Capital and guaranteed by the Southern Company Gas parent entity. Other long-term debt issued represents first mortgage bonds issued by Nicor Gas.
(d)Includes intercompany loans from Southern Company to Mississippi Power and reductions in affiliate capital lease obligations at Georgia Power. These transactions are eliminated in Southern Company's Consolidated Financial Statements.
Except as otherwise described herein, Southern Company and its subsidiaries used the proceeds of debt issuances for their redemptions and maturities shown in the table above, to repay short-term indebtedness, and for general corporate purposes, including working capital and, for the subsidiaries, their continuous construction programs.
In March 2017, Southern Company repaid at maturity a $400 million 18-month floating rate bank loan.
In June 2017, Southern Company issued $500 million aggregate principal amount of Series 2017A 5.325% Junior Subordinated Notes due June 21, 2057 and $300 million aggregate principal amount of Series 2017A Floating Rate Senior Notes due September 30, 2020, which bear interest at a floating rate based on three-month LIBOR.
Also in June 2017, Southern Company entered into two $100 million aggregate principal amount short-term floating rate bank term loan agreements, which mature on June 21, 2018 and June 29, 2018 and bear interest based on one-month LIBOR.
In August 2017, Southern Company borrowed $250 million pursuant to a short-term uncommitted bank credit arrangement, which bears interest at a rate agreed upon by Southern Company and the bank from time to time and is payable on no less than 30 days' demand by the bank.
Also in August 2017, Southern Company repaid at maturity $400 million aggregate principal amount of Series 2014A 1.30% Senior Notes.
In November 2017, Southern Company issued $450 million aggregate principal amount of Series 2017B 5.25% Junior Subordinated Notes due December 1, 2077.
In September 2017, Alabama Power issued 10 million shares ($250 million aggregate stated capital) of 5.00% Class A Preferred Stock, Cumulative, Par Value $1 Per Share (Stated Capital $25 Per Share). The majority of the proceeds were used in October 2017 to redeem all 2 million shares ($50 million aggregate stated capital) of Alabama Power's 6.50% Series Preference Stock, 6 million shares ($150 million aggregate stated capital) of Alabama Power's 6.45% Series Preference Stock, and 1.52 million shares ($38 million aggregate stated capital) of Alabama Power's 5.83% Class A Preferred Stock.
In June 2017, Georgia Power entered into two short-term floating rate bank loans in aggregate principal amounts of $50 million and $150 million, with maturity dates of December 1, 2017 and May 31, 2018, respectively, and one long-term floating rate bank
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Southern Company and Subsidiary Companies 2017 Annual Report


loan of $100 million, with a maturity date of June 28, 2018, which was amended in August 2017 to extend the maturity date to October 26, 2018. These loans bear interest based on one-month LIBOR. Also in June 2017, Georgia Power borrowed $500 million pursuant to a short-term uncommitted bank credit arrangement, which bears interest at a rate agreed upon by Georgia Power and the bank from time to time and is payable on no less than 30 days' demand by the bank.
In August 2017, Georgia Power repaid its $50 million floating rate bank loan due December 1, 2017 and $250 million of the $500 million aggregate principal amount outstanding pursuant to its uncommitted bank credit arrangement. In December 2017, Georgia Power repaid the remaining $250 million aggregate principal amount outstanding pursuant to its uncommitted bank credit arrangement.
Subsequent to December 31, 2017, Georgia Power repaid its outstanding $150 million and $100 million floating rate bank loans due May 31, 2018 and October 26, 2018, respectively.
As reflected in the table above under other long-term debt issuances, in September 2017, Georgia Power also issued $270 million aggregate principal amount of Series 2017A 5.00% Junior Subordinated Notes due October 1, 2077. The proceeds were used to redeem all 1.8 million shares ($45 million aggregate liquidation amount) of Georgia Power's 6.125% Series Class A Preferred Stock and 2.25 million shares ($225 million aggregate liquidation amount) of Georgia Power's 6.50% Series 2007A Preference Stock.
In March 2017, Gulf Power extended the maturity of its $100 million short-term floating rate bank loan bearing interest based on one-month LIBOR from April 2017 to October 2017 and subsequently repaid the loan in May 2017.
A portion of the proceeds of Gulf Power's senior note issuances was used in June 2017 to redeem 550,000 shares ($55 million aggregate liquidation amount) of Gulf Power's 6.00% Series Preference Stock, 450,000 shares ($45 million aggregate liquidation amount) of Gulf Power's Series 2007A 6.45% Preference Stock, and 500,000 shares ($50 million aggregate liquidation amount) of Gulf Power's Series 2013A 5.60% Preference Stock.
In June 2017, Mississippi Power prepaid $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan, which matures on March 30, 2018.
In September 2017, Southern Power amended its $60 million aggregate principal amount floating rate term loan to, among other things, increase the aggregate principal amount to $100 million and extend the maturity date from September 2017 to October 2018.
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, Southern Company and its subsidiaries plan to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Credit Rating Risk
At December 31, 2017, Southern Company and its subsidiaries did not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change of certain subsidiaries to BBB and/or Baa2 or below. These contracts are for physical electricity and natural gas purchases and sales, fuel purchases, fuel transportation and storage, energy price risk management, transmission, interest rate management, and construction of new generation at Plant Vogtle Units 3 and 4.
The maximum potential collateral requirements under these contracts at December 31, 2017 were as follows:
Credit Ratings
Maximum
Potential
Collateral
Requirements
 (in millions)
At BBB and/or Baa2$40
At BBB- and/or Baa3$665
At BB+ and/or Ba1(*)
$2,390
(*)Any additional credit rating downgrades at or below BB- and/or Ba3 could increase collateral requirements up to an additional $38 million.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of Southern Company and its subsidiaries to access capital markets and would be likely to
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Southern Company and Subsidiary Companies 2017 Annual Report


impact the cost at which they do so.
On March 1, 2017, Moody's downgraded the senior unsecured debt rating of Mississippi Power to Ba1 from Baa3.
On March 20, 2017, Moody's revised its rating outlook for Georgia Power from stable to negative.
On March 24, 2017, S&P revised its consolidated credit rating outlook for Southern Company and its subsidiaries (including the traditional electric operating companies, Southern Power, Southern Company Gas, Southern Company Gas Capital, and Nicor Gas) from stable to negative.
On March 30, 2017, Fitch Ratings, Inc. placed the ratings of Southern Company, Georgia Power, and Mississippi Power on rating watch negative.
On June 22, 2017, Moody's placed the ratings of Mississippi Power on review for downgrade. On September 21, 2017, Moody's revised its rating outlook for Mississippi Power from under review to stable.
On January 19, 2018, Moody's revised its rating outlooks for Southern Company and Alabama Power from stable to negative.
While it is unclear how the credit rating agencies, the FERC, and relevant state regulatory bodies may respond to the Tax Reform Legislation, certain financial metrics, such as the funds from operations to debt percentage, used by the credit rating agencies to assess Southern Company and its subsidiaries may be negatively impacted. Absent actions by Southern Company and its subsidiaries to mitigate the resulting impacts, which, among other alternatives, could include adjusting capital structure and/or monetizing regulatory assets, the credit ratings of Southern Company and certain of its subsidiaries could be negatively affected. See Note 3 to the financial statements for additional information related to state PSC or other regulatory agency actions related to the Tax Reform Legislation.
Market Price Risk
The Southern Company system is exposed to market risks, including commodity price risk, interest rate risk, weather risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, the applicable company nets the exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the applicable company's policies in areas such as counterparty exposure and risk management practices. Southern Company Gas' wholesale gas operations use various contracts in its commercial activities that generally meet the definition of derivatives. For the traditional electric operating companies, Southern Power, and Southern Company Gas' other businesses, each company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis.
To mitigate future exposure to a change in interest rates, Southern Company and certain of its subsidiaries enter into derivatives that have been designated as hedges. Derivatives that have been designated as hedges outstanding at December 31, 2017 have a notional amount of $3.7 billion and are intended to mitigate interest rate volatility related to existing fixed and floating rate obligations. The weighted average interest rate on $6.3 billion of long-term variable interest rate exposure at December 31, 2017 was 2.43%. If Southern Company sustained a 100 basis point change in interest rates for all long-term variable interest rate exposure, the change would affect annualized interest expense by approximately $63 million at December 31, 2017. See Note 1 to the financial statements under "Financial Instruments" and Note 11 to the financial statements for additional information.
Southern Power Company had foreign currency denominated debt of €1.1 billion at December 31, 2017. Southern Power Company has mitigated its exposure to foreign currency exchange rate risk through the use of foreign currency swaps converting all interest and principal payments to fixed-rate U.S. dollars.
Due to cost-based rate regulation and other various cost recovery mechanisms, the traditional electric operating companies and natural gas distribution utilities continue to have limited exposure to market volatility in interest rates, foreign currency exchange rates, commodity fuel prices, and prices of electricity. In addition, Southern Power's exposure to market volatility in commodity fuel prices and prices of electricity is limited because its long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, Southern Power has been and may continue to be exposed to market volatility in energy-related commodity prices as a result of uncontracted generating capacity. To mitigate residual risks relative to movements in electricity prices, the traditional electric operating companies and Southern Power may enter into physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market and, to a lesser extent, financial hedge contracts for natural gas purchases; however, a significant portion of contracts are priced at market. The traditional electric operating companies and certain of the natural gas distribution utilities manage fuel-hedging programs implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies. Southern Company had no material change in market risk exposure for the year ended December 31, 2017 when compared to the year ended December 31, 2016.
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Southern Company and Subsidiary Companies 2017 Annual Report


The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. For the years ended December 31, the changes in fair value of energy-related derivative contracts, the majority of which are composed of regulatory hedges, were as follows:
 2017 Changes 2016 Changes
 Fair Value
 (in millions)
Contracts outstanding at the beginning of the period, assets (liabilities), net$41
 $(213)
Acquisitions
 (54)
Contracts realized or settled(8) 141
Current period changes(a)
(196) 171
Contracts outstanding at the end of the period, assets (liabilities), net(b)
$(163) $45
(a)Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
(b)Excludes premium and intrinsic value associated with weather derivatives of $11 million at December 31, 2017 and includes premium and intrinsic value associated with weather derivatives of $4 million at December 31, 2016.
The net hedge volumes of energy-related derivative contracts were 621 million mmBtu and 500 million mmBtu for the years ended December 31, 2017 and 2016, respectively.
For the traditional electric operating companies and Southern Power, the weighted average swap contract cost above or (below) market prices was approximately $0.15 per mmBtu as of December 31, 2017 and $(0.05) per mmBtu as of December 31, 2016. The majority of the natural gas hedge gains and losses are recovered through the traditional electric operating companies' fuel cost recovery clauses.
At December 31, 2017 and 2016, substantially all of the Southern Company system's energy-related derivative contracts were designated as regulatory hedges and were related to the applicable company's fuel-hedging program. Therefore, gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as they are recovered through the energy cost recovery clause. Certain other gains and losses on energy-related derivatives, designated as cash flow hedges, are initially deferred in OCI before being recognized in income in the same period as the hedged transaction. Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred and were not material for any year presented.
The Southern Company system uses exchange-traded market-observable contracts, which are categorized as Level 1 of the fair value hierarchy, and over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. See Note 10 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts at December 31, 2017 were as follows:
 Fair Value Measurements
 December 31, 2017
 
Total
Fair Value
 Maturity
  Year 1 Years 2&3 Years 4&5
 (in millions)
Level 1$(148) $(71) $(59) $(18)
Level 2(15) (30) 13
 2
Level 3
 
 
 
Fair value of contracts outstanding at end of period$(163) $(101) $(46) $(16)
The Southern Company system is exposed to market price risk in the event of nonperformance by counterparties to energy-related and interest rate derivative contracts. The Southern Company system only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P, or with counterparties who have posted collateral to cover potential credit exposure. Therefore, the Southern Company system does not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 11 to the financial statements.
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Southern Company and Subsidiary Companies 2017 Annual Report


With the exception of Southern Company Gas' subsidiary, Atlanta Gas Light, and the Southern Company Gas wholesale gas services business, the Southern Company system is not exposed to concentrations of credit risk. Concentration of credit risk occurs at Atlanta Gas Light for amounts billed for services and other costs to its customers, which consist of 15 natural gas marketers in Georgia responsible for the retail sale of natural gas to end-use customers in Georgia. For 2017, the four largest natural gas marketers based on customer count accounted for 19% of Southern Company Gas' adjusted operating margin. Southern Company Gas' wholesale gas services business has a concentration of credit risk for services it provides to its counterparties as measured by its 30-day receivable exposure plus forward exposure. At December 31, 2017, Southern Company Gas' wholesale gas services business' top 20 counterparties represented approximately 48%, or $203 million, of its total counterparty exposure and had a weighted average S&P equivalent credit rating of A-, all of which is consistent with the prior year.
Southern Company performs periodic reviews of its leveraged lease transactions, both domestic and international, and the creditworthiness of the lessees, including a review of the value of the underlying leased assets and the credit ratings of the lessees. Southern Company's domestic lease transactions generally do not have any credit enhancement mechanisms; however, the lessees in its international lease transactions have pledged various deposits as additional security to secure the obligations. The lessees in the Company's international lease transactions are also required to provide additional collateral in the event of a credit downgrade below a certain level.
Capital Requirements and Contractual Obligations
The Southern Company system's construction program is currently estimated to total approximately $9.4 billion for 2018, $9.3 billion for 2019, $8.4 billion for 2020, $7.0 billion for 2021, and $6.9 billion for 2022. These amounts include expenditures of approximately $1.2 billion, $1.0 billion, $0.9 billion, $0.7 billion, and $0.4 billion for the construction of Plant Vogtle Units 3 and 4 in 2018, 2019, 2020, 2021, and 2022, respectively, and an average of approximately $1.3 billion per year for 2018 through 2022 for Southern Power's planned expenditures for plant acquisitions and placeholder growth. These amounts also include capital expenditures related to contractual purchase commitments for nuclear fuel and capital expenditures covered under LTSAs. Estimated capital expenditures to comply with environmental laws and regulations included in these amounts are $1.1 billion, $0.3 billion, $0.4 billion, $0.5 billion, and $0.5 billion for 2018, 2019, 2020, 2021, and 2022, respectively. These estimated expenditures do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See FUTURE EARNINGS POTENTIAL – "Environmental MattersEnvironmental Laws and Regulations" and " – Global Climate Issues" herein for additional information.
The traditional electric operating companies also anticipate costs associated with closure and monitoring of ash ponds in accordance with the CCR Rule, which are reflected in the Company's ARO liabilities. These costs, which could change as the Southern Company system continues to refine its assumptions underlying the cost estimates and evaluate the method and timing of compliance activities, are estimated to be approximately $0.3 billion, $0.3 billion, $0.4 billion, $0.5 billion, and $0.4 billion for 2018, 2019, 2020, 2021, and 2022, respectively. See Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
The construction programs are subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; changes in environmental laws and regulations; the outcome of any legal challenges to the environmental rules; changes in electric generating plants, including unit retirements and replacements and adding or changing fuel sources at existing electric generating units, to meet regulatory requirements; changes in FERC rules and regulations; state regulatory agency approvals; changes in the expected environmental compliance program; changes in legislation; the cost and efficiency of construction labor, equipment, and materials; project scope and design changes; storm impacts; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures will be fully recovered. Additionally, planned expenditures for plant acquisitions may vary due to market opportunities and Southern Power's ability to execute its growth strategy. See Note 12 to the financial statements under "Southern Power" for additional information regarding Southern Power's plant acquisitions.
In addition, the construction program includes the development and construction of new electric generating facilities with designs that have not been previously constructed, which may result in revised estimates during construction. The ability to control costs and avoid cost overruns during the development, construction, and operation of new facilities is subject to a number of factors, including, but not limited to, changes in labor costs and productivity, adverse weather conditions, shortages and inconsistent quality of equipment, materials, and labor, contractor or supplier delay, non-performance under construction, operating, or other agreements, operational readiness, including specialized operator training and required site safety programs, unforeseen engineering or design problems, start-up activities (including major equipment failure and system integration), and/or operational performance. See Note 3 to the financial statements under "Nuclear Construction" for information regarding additional factors that may impact construction expenditures.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


As a result of NRC requirements, Alabama Power and Georgia Power have external trust funds for nuclear decommissioning costs; however, Alabama Power currently has no additional funding requirements. For additional information, see Note 1 to the financial statements under "Nuclear Decommissioning."
In addition, as discussed in Note 2 to the financial statements, the Southern Company system provides postretirement benefits to the majority of its employees and funds trusts to the extent required by PSCs, other applicable state regulatory agencies, or the FERC.
Other funding requirements related to obligations associated with scheduled maturities of long-term debt, as well as the related interest, derivative obligations, preferred stock dividends, leases, unrecognized tax benefits, pipeline charges, storage capacity, gas supply, asset management agreements, other purchase commitments, and trusts are detailed in the contractual obligations table that follows. See Notes 1, 2, 5, 6, 7, and 11 to the financial statements for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


Contractual Obligations
The Southern Company system's contractual obligations at December 31, 2017 were as follows:
 2018 2019- 2020 2021- 2022 After 2022 Total
 (in millions)
Long-term debt(a) —
         
Principal$3,865
 $6,293
 $5,206
 $32,610
 $47,974
Interest1,782
 3,286
 2,793
 27,535
 35,396
Preferred stock dividends of subsidiaries(b)
16
 33
 33
 
 82
Financial derivative obligations(c)
493
 198
 37
 5
 733
Operating leases(d)
149
 232
 178
 968
 1,527
Capital leases(d)
39
 43
 20
 232
 334
Unrecognized tax benefits(e)
18
 
 
 
 18
Pipeline charges, storage capacity, and gas supply(f)
813
 968
 714
 2,294
 4,789
Asset management agreements(g)
9
 6
 
 
 15
Purchase commitments 
        

Capital(h)
9,016
 16,905
 12,749
 
 38,670
Fuel(i)
3,156
 3,573
 1,927
 5,588
 14,244
Purchased power(j)
424
 884
 886
 3,716
 5,910
Other(k)
407
 713
 434
 2,745
 4,299
Trusts —        

Nuclear decommissioning(l)
5
 11
 11
 94
 121
Pension and other postretirement benefit plans(m)
137
 275
 
 
 412
Total$20,329
 $33,420
 $24,988
 $75,787
 $154,524
(a)
All amounts are reflected based on final maturity dates except for amounts related to FFB borrowings and certain revenue bonds. As it relates to the FFB borrowings, the final maturity date is February 20, 2044; however, principal amortization is reflected beginning in 2020. See Note 6 to the financial statements under "DOE Loan Guarantee Borrowings" and "Securities Due Within One Year" for additional information. Southern Company and its subsidiaries plan to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit. Variable rate interest obligations are estimated based on rates as of December 31, 2017, as reflected in the statements of capitalization. Fixed rates include, where applicable, the effects of interest rate derivatives employed to manage interest rate risk. Long-term debt excludes capital lease amounts (shown separately).
(b)Represents preferred stock of subsidiaries. Preferred stock does not mature; therefore, amounts are provided for the next five years only.
(c)See Notes 1 and 11 to the financial statements.
(d)Excludes PPAs that are accounted for as leases and included in "Purchased power."
(e)
See Note 5 to the financial statements under "Unrecognized Tax Benefits" for additional information.
(f)Includes charges recoverable through a natural gas cost recovery mechanism, or alternatively billed to marketers selling retail natural gas, and demand charges associated with Southern Company Gas' wholesale gas services. The gas supply balance includes amounts for gas commodity purchase commitments associated with Southern Company Gas' gas marketing services of 35 million mmBtu at floating gas prices calculated using forward natural gas prices at December 31, 2017 and valued at $101 million. Southern Company Gas provides guarantees to certain gas suppliers for certain of its subsidiaries in support of payment obligations.
(g)Represents fixed-fee minimum payments for asset management agreements associated with wholesale gas services.
(h)
The Southern Company system provides estimated capital expenditures for a five-year period, including capital expenditures associated with environmental regulations. These amounts exclude contractual purchase commitments for nuclear fuel and capital expenditures covered under LTSAs which are reflected in "Fuel" and "Other," respectively. At December 31, 2017, significant purchase commitments were outstanding in connection with the construction program. See FUTURE EARNINGS POTENTIAL – "Environmental MattersEnvironmental Laws and Regulations" herein for additional information.
(i)Primarily includes commitments to purchase coal, nuclear fuel, and natural gas, as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery. Amounts reflected for natural gas purchase commitments have been estimated based on the New York Mercantile Exchange future prices at December 31, 2017.
(j)Estimated minimum long-term obligations for various PPA purchases from gas-fired, biomass, and wind-powered facilities.
(k)Includes LTSAs, contracts for the procurement of limestone, contractual environmental remediation liabilities, and operation and maintenance agreements. LTSAs include price escalation based on inflation indices.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


(l)
Projections of nuclear decommissioning trust fund contributions for Plant Hatch and Plant Vogtle Units 1 and 2 are based on the 2013 ARP for Georgia Power. Alabama Power also has external trust funds for nuclear decommissioning costs; however, Alabama Power currently has no additional funding requirements. See Note 1 to the financial statements under "Nuclear Decommissioning" for additional information.
(m)The Southern Company system forecasts contributions to the pension and other postretirement benefit plans over a three-year period. Southern Company anticipates no mandatory contributions to the qualified pension plans during the next three years. Amounts presented represent estimated benefit payments for the nonqualified pension plans, estimated non-trust benefit payments for the other postretirement benefit plans, and estimated contributions to the other postretirement benefit plan trusts, all of which will be made from corporate assets of Southern Company's subsidiaries. See Note 2 to the financial statements for additional information related to the pension and other postretirement benefit plans, including estimated benefit payments. Certain benefit payments will be made through the related benefit plans. Other benefit payments will be made from corporate assets of Southern Company's subsidiaries.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


Cautionary Statement Regarding Forward-Looking StatementsOther Business Activities
Southern Company's 2017 Annual Report contains forward-looking statements. Forward-looking statementsother business activities primarily include among other things, statements concerning regulated rates, the strategic goals for the wholesale business, customer and sales growth, economic conditions, fuel and environmental cost recovery and other rate actions, current and proposed environmental regulations and related compliance plans and estimated expenditures, pending or potential litigation matters, access to sources of capital, projections for the qualified pension plans, postretirement benefit plans, and nuclear decommissioning trust fund contributions, financing activities, completion dates of construction projects, completion of announced acquisitions or dispositions, filings with state and federal regulatory authorities, impacts of the Tax Reform Legislation, federal and state income tax benefits, estimated sales and purchases under power sale and purchase agreements, and estimated construction and other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:
the impact of recent and future federal and state regulatory changes, including environmental laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which Southern Company and its subsidiaries are subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulations and IRS interpretations, actions that may be taken in response by regulatory authorities, and its impact, if any, on the credit ratings of Southern Company and its subsidiaries;
current and future litigation or regulatory investigations, proceedings, or inquiries;
the effects, extent, and timing of the entry of additional competition in the markets in which Southern Company's subsidiaries operate;
variations in demand for electricity and natural gas, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures, including from the development and deployment of alternative energy sources such as self-generation and distributed generation technologies, and any potential economic impacts resulting from federal fiscal decisions;
available sources and costs of natural gas and other fuels;
limits on pipeline capacity;
transmission constraints;
effects of inflation;
the ability to control costs and avoid cost overruns during the development, construction, and operation of facilities, which include the development and construction of generating facilities with designs that have not been previously constructed, including changes in labor costs and productivity, adverse weather conditions, shortages and inconsistent quality of equipment, materials, and labor, contractor or supplier delay, non-performance under construction, operating, or other agreements, operational readiness, including specialized operator training and required site safety programs, unforeseen engineering or design problems, start-up activities (including major equipment failure and system integration), and/or operational performance;
the ability to construct facilities in accordance with the requirements of permits and licenses (including satisfaction of NRC requirements), to satisfy any environmental performance standards and the requirements of tax credits and other incentives, and to integrate facilities into the Southern Company system upon completion of construction;
investment performance of the Southern Company system's employee and retiree benefit plans and nuclear decommissioning trust funds;
advances in technology;
ongoing renewable energy partnerships and development agreements;
state and federal rate regulations and the impact of pending and future rate cases and negotiations, including rate actions relating to fuel and other cost recovery mechanisms;
the ability to successfully operate the electric utilities' generating, transmission, and distribution facilities and Southern Company Gas' natural gas distribution and storage facilities and the successful performance of necessary corporate functions;
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company and Subsidiary Companies 2017 Annual Report


legal proceedings and regulatory approvals and actions related to Plant Vogtle Units 3 and 4, including Georgia PSC approvals and NRC actions;
litigation related to the Kemper County energy facility;
the inherent risks involved in operating and constructing nuclear generating facilities, including environmental, health, regulatory, natural disaster, terrorism, and financial risks;
the inherent risks involved in transporting and storing natural gas;
the performance of projects undertaken by the non-utility businesses and the success of efforts to invest in and develop new opportunities;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, including the proposed disposition by a wholly-owned subsidiary of Southern Company Gas of Elizabethtown Gas and Elkton Gas and the potential sale of a 33% equity interest in substantially all of Southern Power's solar assets, which cannot be assured to be completed or beneficial to Southern Company or its subsidiaries;
the possibility that the anticipated benefits from the Merger cannot be fully realized or may take longer to realize than expected and the possibility that costs related to the integration of Southern Company and Southern Company Gas will be greater than expected;
the ability of counterparties of Southern Company and its subsidiaries to make payments as and when due and to perform as required;
the ability to obtain new short- and long-term contracts with wholesale customers;
the direct or indirect effect on the Southern Company system's business resulting from cyber intrusion or physical attack and the threat of physical attacks;
interest rate fluctuations and financial market conditions and the results of financing efforts;
changes in Southern Company's and any of its subsidiaries' credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general, as well as potential impacts on the benefits of the DOE loan guarantees;
the ability of Southern Company's electric utilities to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;
catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events such as influenzas, or other similar occurrences;
the direct or indirect effects on the Southern Company system's business resulting from incidents affecting the U.S. electric grid, natural gas pipeline infrastructure, or operation of generating or storage resources;
impairments of goodwill or long-lived assets;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by Southern Company from time to time with the SEC.
Southern Company expressly disclaims any obligation to update any forward-looking statements.
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CONSOLIDATED STATEMENTS OF INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Southern Company and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Revenues:     
Retail electric revenues$15,330
 $15,234
 $14,987
Wholesale electric revenues2,426
 1,926
 1,798
Other electric revenues681
 698
 657
Natural gas revenues3,791
 1,596
 
Other revenues803
 442
 47
Total operating revenues23,031
 19,896
 17,489
Operating Expenses:     
Fuel4,400
 4,361
 4,750
Purchased power863
 750
 645
Cost of natural gas1,601
 613
 
Cost of other sales513
 260
 
Other operations and maintenance5,481
 5,240
 4,416
Depreciation and amortization3,010
 2,502
 2,034
Taxes other than income taxes1,250
 1,113
 997
Estimated loss on Kemper IGCC3,362
 428
 365
Total operating expenses20,480
 15,267
 13,207
Operating Income2,551
 4,629
 4,282
Other Income and (Expense):     
Allowance for equity funds used during construction160
 202
 226
Earnings from equity method investments106
 59
 
Interest expense, net of amounts capitalized(1,694) (1,317) (840)
Other income (expense), net(55) (93) (39)
Total other income and (expense)(1,483) (1,149) (653)
Earnings Before Income Taxes1,068
 3,480
 3,629
Income taxes142
 951
 1,194
Consolidated Net Income926
 2,529
 2,435
Less:     
Dividends on preferred and preference stock of subsidiaries38
 45
 54
Net income attributable to noncontrolling interests46
 36
 14
Consolidated Net Income Attributable to Southern Company$842
 $2,448
 $2,367
Common Stock Data:     
Earnings per share —     
Basic$0.84
 $2.57
 $2.60
Diluted0.84
 2.55
 2.59
Average number of shares of common stock outstanding — (in millions)     
Basic1,000
 951
 910
Diluted1,008
 958
 914
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Southern Company and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Consolidated Net Income$926
 $2,529
 $2,435
Other comprehensive income:     
Qualifying hedges:     
Changes in fair value, net of tax of $34, $(84), and $(8), respectively57
 (136) (13)
Reclassification adjustment for amounts included in net
income, net of tax of $(37), $43, and $4, respectively
(60) 69
 6
Pension and other postretirement benefit plans:     
Benefit plan net gain (loss), net of tax of $6, $10, and $(1),
respectively
17
 13
 (2)
Reclassification adjustment for amounts included in net income, net of
tax of $(6), $3, and $4, respectively
(23) 4
 7
Total other comprehensive income (loss)(9) (50) (2)
Less:     
Dividends on preferred and preference stock of subsidiaries38
 45
 54
Comprehensive income attributable to noncontrolling interests46
 36
 14
Consolidated Comprehensive Income Attributable to Southern Company$833
 $2,398
 $2,365
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2017, 2016, and 2015
Southern Company and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2015
   (in millions)
Operating Activities:     
Consolidated net income$926
 $2,529
 $2,435
Adjustments to reconcile consolidated net income
to net cash provided from operating activities —
     
Depreciation and amortization, total3,457
 2,923
 2,395
Deferred income taxes166
 (127) 1,404
Collateral deposits(4) (102) 
Allowance for equity funds used during construction(160) (202) (226)
Pension and postretirement funding(2) (1,029) (7)
Settlement of asset retirement obligations(177) (171) (37)
Stock based compensation expense109
 121
 99
Hedge settlements6
 (233) (17)
Estimated loss on Kemper IGCC3,179
 428
 365
Income taxes receivable, non-current(47) (122) (413)
Other, net(109) (99) 49
Changes in certain current assets and liabilities —     
-Receivables(199) (544) 243
-Fossil fuel for generation36
 178
 61
-Natural gas for sale36
 (226) 
-Other current assets(143) (206) (152)
-Accounts payable(280) 301
 (353)
-Accrued taxes(142) 1,456
 352
-Retail fuel cost over recovery(212) (231) 289
-Mirror CWIP
 
 (271)
-Other current liabilities(45) 250
 58
Net cash provided from operating activities6,395
 4,894
 6,274
Investing Activities:     
Business acquisitions, net of cash acquired(1,070) (10,689) (1,719)
Property additions(7,423) (7,310) (5,674)
Proceeds pursuant to the Toshiba Guarantee, net of joint owner portion               1,682
 
 
Investment in restricted cash(17) (733) (160)
Distribution of restricted cash34
 742
 154
Nuclear decommissioning trust fund purchases(811) (1,160) (1,424)
Nuclear decommissioning trust fund sales805
 1,154
 1,418
Cost of removal, net of salvage(313) (245) (167)
Change in construction payables, net259
 (121) 402
Investment in unconsolidated subsidiaries(152) (1,444) 
Payments pursuant to LTSAs(227) (134) (197)
Other investing activities42
 (108) 87
Net cash used for investing activities(7,191) (20,048) (7,280)
Financing Activities:     
Increase (decrease) in notes payable, net(401) 1,228
 73
Proceeds —     
Long-term debt5,858
 16,368
 7,029
Common stock793
 3,758
 256
Preferred stock250
 
 
Short-term borrowings1,259
 
 755
Redemptions and repurchases —     
Long-term debt(2,930) (3,145) (3,604)
Common stock
 
 (115)
Interest-bearing refundable deposits
 
 (275)
Preferred and preference stock(658) 
 (412)
Short-term borrowings(659) (478) (255)
Distributions to noncontrolling interests(119) (72) (18)
Capital contributions from noncontrolling interests80
 682
 341
Payment of common stock dividends(2,300) (2,104) (1,959)
Other financing activities(222) (512) (116)
Net cash provided from financing activities951
 15,725
 1,700
Net Change in Cash and Cash Equivalents155
 571
 694
Cash and Cash Equivalents at Beginning of Year1,975
 1,404
 710
Cash and Cash Equivalents at End of Year$2,130
 $1,975
 $1,404
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2017 and 2016
Southern Company and Subsidiary Companies 2017 Annual Report
Assets2017
 2016
 (in millions)
Current Assets:   
Cash and cash equivalents$2,130
 $1,975
Receivables —   
Customer accounts receivable1,806
 1,583
Energy marketing receivable607
 623
Unbilled revenues810
 706
Under recovered fuel clause revenues171
 
Income taxes receivable, current63
 544
Other accounts and notes receivable635
 377
Accumulated provision for uncollectible accounts(44) (43)
Materials and supplies1,438
 1,462
Fossil fuel for generation594
 689
Natural gas for sale595
 631
Prepaid expenses452
 364
Other regulatory assets, current604
 581
Other current assets211
 230
Total current assets10,072
 9,722
Property, Plant, and Equipment:   
In service103,542
 98,416
Less: Accumulated depreciation31,457
 29,852
Plant in service, net of depreciation72,085
 68,564
Nuclear fuel, at amortized cost883
 905
Construction work in progress6,904
 8,977
Total property, plant, and equipment79,872
 78,446
Other Property and Investments:   
Goodwill6,268

6,251
Equity investments in unconsolidated subsidiaries1,513

1,549
Other intangible assets, net of amortization of $186 and $62
at December 31, 2017 and December 31, 2016, respectively
873
 970
Nuclear decommissioning trusts, at fair value1,832
 1,606
Leveraged leases775
 774
Miscellaneous property and investments249
 270
Total other property and investments11,510
 11,420
Deferred Charges and Other Assets:   
Deferred charges related to income taxes825
 1,629
Unamortized loss on reacquired debt206
 223
Other regulatory assets, deferred6,943
 6,851
Other deferred charges and assets1,577
 1,406
Total deferred charges and other assets9,551
 10,109
Total Assets$111,005
 $109,697
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2017 and 2016
Southern Company and Subsidiary Companies 2017 Annual Report
Liabilities and Stockholders' Equity2017
 2016
 (in millions)
Current Liabilities:   
Securities due within one year$3,892
 $2,587
Notes payable2,439
 2,241
Energy marketing trade payables546
 597
Accounts payable2,530
 2,228
Customer deposits542
 558
Accrued taxes —   
Accrued income taxes6
 193
Unrecognized tax benefits18
 385
Other accrued taxes613
 667
Accrued interest488
 518
Accrued compensation959
 915
Asset retirement obligations, current351
 378
Acquisitions payable5
 489
Other regulatory liabilities, current337
 236
Other current liabilities868
 925
Total current liabilities13,594
 12,917
Long-Term Debt (See accompanying statements)
44,462
 42,629
Deferred Credits and Other Liabilities:   
Accumulated deferred income taxes6,842
 14,092
Deferred credits related to income taxes7,256
 219
Accumulated deferred ITCs2,267
 2,228
Employee benefit obligations2,256
 2,299
Asset retirement obligations, deferred4,473
 4,136
Accrued environmental remediation389
 397
Other cost of removal obligations2,684
 2,748
Other regulatory liabilities, deferred239
 258
Other deferred credits and liabilities691
 880
Total deferred credits and other liabilities27,097
 27,257
Total Liabilities85,153
 82,803
Redeemable Preferred Stock of Subsidiaries (See accompanying statements)
324
 118
Redeemable Noncontrolling Interests (See accompanying statements)

 164
Total Stockholders' Equity (See accompanying statements)
25,528
 26,612
Total Liabilities and Stockholders' Equity$111,005
 $109,697
Commitments and Contingent Matters (See notes)

 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF CAPITALIZATION
At December 31, 2017 and 2016
Southern Company and Subsidiary Companies 2017 Annual Report

   2017
 2016
 2017
 2016
   (in millions)  (percent of total)
Long-Term Debt:         
Long-term debt payable to affiliated trusts —         
Variable rate (4.44% at 12/31/17) due 2042  $206
 $206
    
Long-term senior notes and debt —         
MaturityInterest Rates        
20171.30% to 7.20% 
 2,019
    
20181.50% to 5.40% 2,402
 2,403
    
20191.85% to 5.55% 3,074
 3,076
    
20202.00% to 4.75% 2,273
 1,326
    
20212.35% to 9.10% 2,643
 2,655
    
20221.00% to 8.70% 2,016
 1,378
    
2023 through 20471.85% to 7.30% 22,142
 20,369
    
Variable rates (1.82% to 3.75% at 1/1/17) due 2017  
 461
    
Variable rates (2.29% to 3.05% at 12/31/17) due 2018  1,420
 1,520
    
Variable rates (2.04% to 2.18% at 12/31/17) due 2020  825
 
    
Variable rates (2.55% to 2.79% at 12/31/17) due 2021  25
 25
    
Variable rate (3.75% at 1/1/17) due 2032 to 2036  
 15
    
Total long-term senior notes and debt  36,820
 35,247
    
Other long-term debt —         
Pollution control revenue bonds —         
MaturityInterest Rates        
20194.55% 25
 25
    
20222.10% to 2.35% 90
 90
    
2023 through 20491.15% to 5.15% 1,379
 1,339
    
Variable rates (2.45% to 2.50% at 12/31/17) due 2018  40
 76
    
Variable rates (1.86% to 1.87% at 12/31/17) due 2021  65
 65
    
Variable rates (1.83% to 1.84% at 12/31/17) due 2022  17
 17
    
Variable rates (1.59% to 1.88% at 12/31/17) due 2024 to 2053  1,680
 1,721
    
Plant Daniel revenue bonds (7.13%) due 2021  270
 270
    
FFB loans —         
2.57% to 3.86% due 2020  44
 44
    
2.57% to 3.86% due 2021  44
 44
    
2.57% to 3.86% due 2022  44
 44
    
2.57% to 3.86% due 2023 to 2044  2,493
 2,493
    
First mortgage bonds —         
4.70% due 2019  50
 50
    
2.66% to 6.58% due 2023 to 2057  975
 575
    
Gas facility revenue bonds —         
Variable rate (1.71% at 12/31/17) due 2022  47
 47
    
Variable rate (1.71% at 12/31/17) due 2024 to 2033  154
 154
    
Junior subordinated notes (5.00% to 6.25%) due 2057 to 2077  3,570
 2,350
    
Total other long-term debt  10,987
 9,404
    
Unamortized fair value adjustment of long-term debt  525
 578
    
Capitalized lease obligations  204
 136
    
Unamortized debt premium  44
 52
    
Unamortized debt discount  (206) (194)    
Unamortized debt issuance expense  (226) (213)    
Total long-term debt (annual interest requirement — $1.8 billion) 48,354
 45,216
    
Less amount due within one year  3,892
 2,587
    
Long-term debt excluding amount due within one year  44,462
 42,629
 63.2% 61.3%
          
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CONSOLIDATED STATEMENTS OF CAPITALIZATION (continued)
At December 31, 2017 and 2016
Southern Company and Subsidiary Companies 2017 Annual Report
        
   2017
 2016
 2017
 2016
   (in millions)  (percent of total)
Redeemable Preferred Stock of Subsidiaries:         
Cumulative preferred stock         
$100 par or stated value — 4.20% to 5.44%         
Authorized — 20 million shares         
Outstanding — 1 million shares  324
 81
    
$1 par value — 5.83%         
Authorized — 28 million shares         
Outstanding — 2017: no shares         
                    — 2016: 2 million shares: $25 stated value  
 37
    
Total redeemable preferred stock of subsidiaries
(annual dividend requirement — $16 million)
  324
 118
 0.5
 0.2
Redeemable Noncontrolling Interests  
 164
 
 0.2
Common Stockholders' Equity:         
Common stock, par value $5 per share —  5,038
 4,952
    
Authorized — 1.5 billion shares         
Issued — 2017: 1.0 billion shares         
  — 2016: 991 million shares         
Treasury — 2017: 0.9 million shares         
      — 2016: 0.8 million shares         
Paid-in capital  10,469
 9,661
    
Treasury, at cost  (36) (31)    
Retained earnings  8,885
 10,356
    
Accumulated other comprehensive loss  (189) (180)    
Total common stockholders' equity  24,167
 24,758
 34.4
 35.6
Preferred and Preference Stock of Subsidiaries
   and Noncontrolling Interests:
         
Non-cumulative preferred stock         
$25 par value — 6.00% to 6.13%         
Authorized — 60 million shares         
Outstanding — 2017: no shares         
                     — 2016: 2 million shares  
 45
    
Non-cumulative preference stock         
$1 par value — 6.45% to 6.50%         
Authorized — 65 million shares         
Outstanding — 2017: no shares  
 196
    
 — 2016: 8 million shares         
$100 par or stated value — 5.60% to 6.50%         
Outstanding — 2017: no shares  
 368
    
                     — 2016: 4 million shares         
Noncontrolling interests  1,361
 1,245
    
Total preferred and preference stock of subsidiaries and
noncontrolling interests
  1,361
 1,854
 1.9
 2.7
Total stockholders' equity  25,528
 26,612
    
Total Capitalization  $70,314
 $69,523
 100.0% 100.0%

The accompanying notes are an integral part of these consolidated financial statements. 
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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
For the Years Ended December 31, 2017, 2016, and 2015
Southern Company and Subsidiary Companies 2017 Annual Report
 Southern Company Common Stockholders' Equity     
 Number of Common Shares Common Stock   
Accumulated
Other
Comprehensive Income
(Loss)
 
Preferred
and Preference Stock of Subsidiaries
 
Noncontrolling
Interests
 
 Issued Treasury Par Value Paid-In Capital Treasury Retained Earnings   Total
 (in thousands) (in millions)
Balance at December 31, 2014908,502
 (725) $4,539
 $5,955
 $(26) $9,609
 $(128) $756
 $221
$20,926
Consolidated net income attributable
   to Southern Company

 
 
 
 
 2,367
 
 
 
2,367
Other comprehensive income (loss)
 
 
 
 
 
 (2) 
 
(2)
Stock issued6,571
 (2,599) 33
 223
 
 
 
 
 
256
Stock-based compensation
 
 
 100
 
 
 
 
 
100
Stock repurchased, at cost
 
 
 
 (115) 
 
 
 
(115)
Cash dividends of $2.1525 per share
 
 
 
 
 (1,959) 
 
 
(1,959)
Preference stock redemption
 
 
 
 
 
 
 (150) 
(150)
Contributions from
   noncontrolling interests

 
 
 
 
 
 
 
 567
567
Distributions to
   noncontrolling interests

 
 
 
 
 
 
 
 (18)(18)
Net loss attributable to
   noncontrolling interests

 
 
 
 
 
 
 
 12
12
Other
 (28) 
 4
 (1) (7) 
 3
 (1)(2)
Balance at December 31, 2015915,073
 (3,352) 4,572
 6,282
 (142) 10,010
 (130) 609
 781
21,982
Consolidated net income attributable
   to Southern Company

 
 
 
 
 2,448
 
 
 
2,448
Other comprehensive income (loss)
 
 
 
 
 
 (50) 
 
(50)
Stock issued76,140
 2,599
 380
 3,263
 115
 
 
 
 
3,758
Stock-based compensation
 
 
 120
 
 
 
 
 
120
Cash dividends of $2.2225 per share
 
 
 
 
 (2,104) 
 
 
(2,104)
Contributions from
   noncontrolling interests

 
 
 
 
 
 
 
 618
618
Distributions to
   noncontrolling interests

 
 
 
 
 
 
 
 (57)(57)
Purchase of membership interests
   from noncontrolling interests

 
 
 
 
 
 
 
 (129)(129)
Net income attributable to
   noncontrolling interests

 
 
 
 
 
 
 
 32
32
Other
 (66) 
 (4) (4) 2
 
 
 
(6)
Balance at December 31, 2016991,213
 (819) 4,952
 9,661
 (31) 10,356
 (180) 609
 1,245
26,612
Consolidated net income attributable
   to Southern Company

 
 
 
 
 842
 
 
 
842
Other comprehensive income (loss)
 
 
 
 
 
 (9) 
 
(9)
Stock issued17,319
 
 86
 707
 
 
 
 
 
793
Stock-based compensation
 
 
 105
 
 
 
 
 
105
Cash dividends of $2.3000 per share
 
 
 
 
 (2,300) 
 
 
(2,300)
Preferred and preference stock
   redemptions

 
 
 
 
 
 
 (609) 
(609)
Contributions from
   noncontrolling interests

 
 
 
 
 
 
 
 79
79
Distributions to
   noncontrolling interests

 
 
 
 
 
 
 
 (122)(122)
Net income attributable to
   noncontrolling interests

 
 
 
 
 
 
 
 44
44
Reclassification from redeemable
noncontrolling interests

 
 
 
 
 
 
 
 114
114
Other
 (110) 
 (4) (5) (13) 
 
 1
(21)
Balance at December 31, 20171,008,532
 (929) $5,038
 $10,469
 $(36) $8,885
 $(189) $
 $1,361
$25,528
The accompanying notes are an integral part of these consolidated financial statements.
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NOTES TO FINANCIAL STATEMENTS
Southern Company and Subsidiary Companies 2017 Annual Report




Index to the Notes to Financial Statements

NotePage
1
2
3
4
5
6
7
8
9
10
11
12
13
14


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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
The Southern Company (Southern Company or the Company) is the parent company of four traditional electric(which does not allocate operating companies,expenses to business units); PowerSecure, which provides distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers; Southern Power, Southern Company Gas (as of July 1, 2016), SCS,Holdings, which invests in various projects; and Southern Linc, Southern Company Holdings, Inc. (Southern Holdings), Southern Nuclear, PowerSecure (as of May 9, 2016), and other direct and indirect subsidiaries. The traditional electric operating companies – Alabama Power, Georgia Power, Gulf Power, and Mississippi Power – are vertically integrated utilities providing electric service in four Southeastern states. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through the natural gas distribution utilities in seven states and is involved in several other complementary businesses including gas marketing services, wholesale gas services, and gas midstream operations. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Lincwhich provides digital wireless communications for use by the Southern Company and its subsidiary companiessystem and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary, primarily
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
A condensed statement of operations for Southern Company's investmentsother business activities follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$554 $110 
Cost of other sales355 87 
Other operations and maintenance175 (26)
Depreciation and amortization77 
Taxes other than income taxes4 — 
Impairment charges (119)
Gain on dispositions, net 14 
Total operating expenses611 (42)
Operating income (loss)(57)152 
Earnings from equity method investments5 
Interest expense863 171 
Other income (expense), net(16)39 
Income taxes (benefit)(298)(65)
Net loss$(633)$87 
Operating Revenues
Operating revenues for these other business activities increased $110 million, or 24.8%, in leveraged leases2023 as compared to 2022 primarily due to increases of $92 million related to distributed infrastructure projects at PowerSecure and $24 million primarily related to sales associated with commercial customers at Southern Linc.
Cost of Other Sales
Cost of other sales for these other electric services.business activities increased $87 million, or 32.5%, in 2023 as compared to 2022 primarily due to increases of $58 million related to distributed infrastructure projects at PowerSecure and $23 million primarily related to sales associated with commercial customers at Southern Nuclear operatesLinc.
Other Operations and providesMaintenance
Other operations and maintenance expenses for these other business activities decreased $26 million, or 12.9%, in 2023 as compared to 2022 primarily due to a decrease at the parent company related to cost containment efforts and lower director compensation expenses.
Impairment Charges
In 2022, a goodwill impairment charge of $119 million was recorded at PowerSecure. See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information.
Gain on Dispositions, Net
In 2022, a $14 million gain was recorded at the parent company as a result of the early termination of the transition services agreement related to the 2019 sale of Gulf Power.
Interest Expense
Interest expense for these other business activities increased $171 million, or 24.7%, in 2023 as compared to 2022. The increase primarily results from parent company financing activities and includes approximately $112 million related to higher interest rates and $73 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Other Income (Expense), Net
Other income (expense), net for these other business activities increased $39 million, or 70.9%, in 2023 as compared to 2022 primarily due to a $29 million decrease in charitable donations and a $12 million increase in interest income, both primarily at the parent company. See Note 15 to the financial statements under "Southern Company" for additional information.
Income Taxes (Benefit)
The income tax benefit for these other business activities increased $65 million, or 27.9%, in 2023 as compared to 2022. The increase was primarily due to a $35 million tax benefit in 2023 related to a reversal of an uncertain tax position associated with the 2019 sale of Gulf Power and higher pre-tax losses, both at the parent company.
Alabama Power
Alabama Power's 2023 net income after dividends on preferred stock was $1.37 billion, representing a $30 million, or 2.2%, increase from 2022. The increase was primarily due to a decrease in income tax expense, an increase in Rate CNP Compliance revenues, a decrease in operations and maintenance expenses primarily related to the reliability reserve, and a lower Rate RSE customer refund accrual in 2023 compared to 2022. These increases to net income were offset by an increase in depreciation rates effective January 2023, a decrease in retail revenues associated with milder weather in Alabama Power's service territory in the first and second quarters of 2023 compared to the corresponding periods in 2022, and increases in capacity-related expenses and interest expense. See Note 2 to the financial statements under "Alabama Power" for additional information.
A condensed income statement for Alabama Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$7,050 $(767)
Fuel1,299 (541)
Purchased power504 (297)
Other operations and maintenance1,769 (166)
Depreciation and amortization1,401 526 
Taxes other than income taxes442 18 
Total operating expenses5,415 (460)
Operating income1,635 (307)
Allowance for equity funds used during construction82 12 
Interest expense, net of amounts capitalized425 43 
Other income (expense), net159 15 
Income taxes81 (342)
Net income1,370 19 
Dividends on preferred stock (11)
Net income after dividends on preferred stock$1,370 $30 
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Operating Revenues
Operating revenues for 2023 were $7.1 billion, reflecting a $767 million, or 9.8%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$6,470 
Estimated change resulting from —
Rates and pricing276 
Sales decline(33)
Weather(84)
Fuel and other cost recovery(470)
Retail — current year$6,159 $6,470 
Wholesale revenues —
Non-affiliates424 726 
Affiliates60 202 
Total wholesale revenues484 928 
Other operating revenues407 419 
Total operating revenues$7,050 $7,817 
Retail revenues decreased $311 million, or 4.8%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The decrease was primarily due to a decrease in fuel and other cost recovery, partially offset by an increase in revenues associated with rates and pricing primarily due to an increase in Rate CNP Compliance revenues and a lower Rate RSE customer refund accrual in 2023 compared to 2022.
See Note 2 to the financial statements under "Alabama Power – Rate ECR," " – Rate RSE," and " – Rate CNP Compliance" for additional information. See "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates include provisions to recognize the recovery of fuel costs, purchased power costs, PPAs certificated by the Alabama PSC, and costs associated with the NDR. Under these provisions, fuel and other cost recovery revenues generally equal fuel and other cost recovery expenses and do not affect net income. See Note 2 to the financial statements under "Alabama Power" for additional information.
Wholesale revenues from sales to non-affiliated utilities were as follows:
20232022
(in millions)
Capacity and other$163 $213 
Energy261 513 
Total non-affiliated$424 $726 
In 2023, wholesale revenues from sales to non-affiliates decreased $302 million, or 41.6%, as compared to 2022. The decrease reflects a 26.0% decrease in the volume of KWHs sold as a result of power sales agreements that ended in May 2023 and a 20.8% decrease in the price of energy primarily as a result of lower natural gas prices.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Alabama Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affect net income. Short-term opportunity energy sales are also included in wholesale energy sales to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Alabama Power's variable cost to produce the energy.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
In 2023, wholesale revenues from sales to affiliates decreased $142 million, or 70.3%, as compared to 2022. The revenue decrease reflects a 47.7% decrease in the price of energy due to lower natural gas prices and a 42.9% decrease in KWH sales due to lower customer demand as a result of milder weather in 2023.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales and purchases are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through Alabama Power's energy cost recovery clause.
In 2023, other operating revenues decreased $12 million, or 2.9%, as compared to 2022 primarily due to decreases of $25 million in cogeneration steam revenue associated with lower natural gas prices and $17 million in rent revenues, partially offset by a $34 million increase in unregulated sales of products and services.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change(*)
(in billions)
Residential17.4 (5.7)%(0.9)%
Commercial12.9 (1.2)0.4 
Industrial20.4 (2.8)(2.8)
Other0.1 (15.5)(15.5)
Total retail50.8 (3.4)(1.3)%
Wholesale
Non-affiliates9.3 (26.0)
Affiliates2.1 (42.9)
Total wholesale11.4 (29.9)
Total energy sales62.2 (9.7)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from the normal temperature conditions. Normal temperature conditions are defined as those experienced in Alabama Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. In 2023, weather-adjusted residential KWH sales decreased 0.9% primarily due to decreased customer usage. Weather-adjusted commercial KWH sales increased 0.4% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 2.8% as a result of a decrease in demand resulting from changes in production levels primarily in the chemicals and forest products sectors.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies related to changes in price and KWH sales.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, Alabama Power purchases a portion of its electricity needs from the wholesale market.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Details of Alabama Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
54.558.3 
Total purchased power (in billions of KWHs)
10.811.6 
Sources of generation (percent)(a)
Coal35 46 
Gas31 24 
Nuclear27 22 
Hydro7 
Cost of fuel, generated (in cents per net KWH)
Coal3.46 3.39 
Gas(a)
2.99 5.12 
Nuclear0.69 0.67 
Average cost of fuel, generated (in cents per net KWH)(a)
2.50 3.19 
Average cost of purchased power (in cents per net KWH)(b)
4.98 8.00 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by Alabama Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $1.8 billion in 2023, a decrease of $838 million, or 31.7%, compared to 2022. The decrease was primarily due to a $674 million decrease in the average cost of fuel and purchased power and a $164 milliondecrease related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through Alabama Power's energy cost recovery clause. Alabama Power, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 2 to the financial statements under "Alabama Power – Rate ECR" for additional information.
Fuel
Fuel expense was $1.3 billion in 2023, a decrease of $541 million, or 29.4%, compared to 2022. The decrease was primarily due to a 41.6% decrease in the average cost of natural gas per KWH generated, which excludes tolling agreements, and a 29.1% decrease in the volume of KWHs generated by coal, partially offset by a 21.2% increase in the volume of KWHs generated by natural gas, an 18.9% decrease in the volume of KWHs generated by hydro facilities as a result of less rainfall in 2023, and a 13.6% increase in the volume of KWHs generated by nuclear.
Purchased Power Non-Affiliates
Purchased power expense from non-affiliates was $253 million in 2023, a decrease of $188 million, or 42.6%, compared to 2022. The decrease was primarily due to a 32.9% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 25.5% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power Affiliates
Purchased power expense from affiliates was $251 million in 2023, a decrease of $109 million, or 30.3%, compared to 2022. The decrease was primarily due to a 51.4% decrease in the average cost per KWH purchased primarily due to lower natural gas prices, partially offset by a 43.4% increase in the volume of KWHs purchased due to the availability of lower cost gas generation in the Southern Company system.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $166 million, or 8.6%, in 2023 as compared to 2022. The change was primarily due to a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred, as well as decreases of $33 million in transmission and distribution expenses and $21 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $30 million in technology infrastructure and application production costs and $25 million in expenses related to unregulated products and services, as well as a $14 million decrease in nuclear power plantsproperty insurance refunds. See Note 2 to the financial statements under "Alabama Power – Reliability Reserve Accounting Order" for additional information.
Depreciation and is managingAmortization
Depreciation and amortization increased $526 million, or 60.1%, in 2023 as compared to 2022 primarily due to an increase in depreciation rates effective in 2023. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $12 million, or 17.1%, in 2023 as compared to 2022 primarily due to increases in capital expenditures related to hydro production and Plant Barry Unit 8 construction. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $43 million, or 11.3%, in 2023 as compared to 2022. The increase reflects approximately $30 million related to higher average outstanding borrowings and $20 million related to higher interest rates. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $15 million, or 10.4%, in 2023 as compared to 2022 primarily due to a decrease in non-operating benefit-related expenses and an increase in interest income, partially offset by a decrease in non-service cost-related retirement benefits income. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $342 million, or 80.9%, in 2023 as compared to 2022 primarily due to a $252 million increase in the flowback of certain excess deferred income taxes and an $84 million decrease due to lower pre-tax earnings. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" and Note 10to the financial statements for additional information.
Georgia Power
Georgia Power's 2023 net income was $2.1 billion, representing a $0.3 billion, or 14.7%, increase from the previous year. The increase was primarily due to lower non-fuel operations and maintenance costs, revenue reductions in 2022 as a result of Georgia Power exceeding its allowed retail return range, a $187 million decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4. PowerSecure is4, and an increase in other revenues, partially offset by a providerdecrease in retail revenues associated with lower contributions from customers with variable demand-driven pricing and milder weather in 2023, as well as higher interest expense. Also contributing to the net income growth were the impacts of productsthe 2022 ARP effective January 1, 2023, including increased retail rates, largely offset by higher depreciation and servicesamortization. See Note 2 to the financial statements under "Georgia Power" for additional information.
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A condensed income statement for Georgia Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$10,118 $(1,466)
Fuel1,781 (705)
Purchased power1,281 (976)
Other operations and maintenance2,083 (266)
Depreciation and amortization1,681 251 
Taxes other than income taxes541 14 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total operating expenses7,299 (1,933)
Operating income2,819 467 
Allowance for equity funds used during construction165 25 
Interest expense, net of amounts capitalized626 141 
Other income (expense), net170 (6)
Income taxes (benefit)448 78 
Net income$2,080 $267 
Operating Revenues
Operating revenues for 2023 were $10.1 billion, reflecting a $1.5 billion, or 12.7%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$10,792 
Estimated change resulting from —
Rates and pricing172 
Sales decline(10)
Weather(141)
Fuel cost recovery(1,591)
Retail — current year$9,222 $10,792 
Wholesale revenues188 235 
Other operating revenues708 557 
Total operating revenues$10,118 $11,584 
Retail revenues decreased $1.6 billion, or 14.5%, in 2023 as compared to 2022. The significant factors driving this change are shown in the areas of distributed generation, energy efficiency,preceding table. The increase in rates and utility infrastructure.pricing was primarily due to base tariff increases in accordance with the 2022 ARP and revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed retail ROE range, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in revenues recognized under the NCCR tariff. See Note 122 to the financial statements under "Southern"Georgia Power – Rate Plans" and " – Nuclear Construction" for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather in 2023.
Electric rates include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses and do not affect net income. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
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Wholesale revenues from power sales were as follows:
20232022
(in millions)
Capacity and other$66 $48 
Energy122 187 
Total$188 $235 
In 2023, wholesale revenues decreased $47 million, or 20.0%, as compared to 2022 largely due to an $81 million decrease related to the average cost per KWH sold due to lower Southern Company Gas – Proposed Sale of Elizabethtown Gassystem fuel and Elkton Gas" for information regarding agreements entered intopurchased power costs, partially offset by a wholly-owned subsidiary$21 million increase related to new capacity contracts and a $13 million increase related to the volume of KWH sales associated with higher market demand.
Wholesale revenues from sales to non-affiliates consist of PPAs and short-term opportunity sales. Wholesale revenues from PPAs have both capacity and energy components. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms and provide for recovery of fixed costs and a return on investment. Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Georgia Power's and the Southern Company Gassystem's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above Georgia Power's variable cost of energy.
Wholesale revenues from sales to sell twoaffiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues increased $151 million, or 27.1%, as compared to 2022 primarily due to an increase of $105 million in unregulated sales associated with power delivery construction and maintenance, outdoor lighting, and energy conservation projects, a net increase of $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs, an increase of $17 million in retail solar program fees, and a $9 million increase in open access transmission tariff sales.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential27.6 (5.0)%(0.4)%
Commercial32.6 0.1 1.2 
Industrial23.5 (1.6)(1.4)
Other0.4 (4.7)(4.2)
Total retail84.1 (2.1)(0.1)%
Wholesale2.6 7.8 
Total energy sales86.7 (1.9)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Georgia Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. Weather-adjusted residential sales decreased 0.4% primarily due to decreased customer usage, largely offset by customer growth. Weather-adjusted commercial KWH sales increased 1.2% primarily due to customer growth. Weather-adjusted industrial KWH sales decreased
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1.4% primarily due to decreases in the textile, mining, and stone, clay, and glass sectors, partially offset by an increase in the paper sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for Georgia Power. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Georgia Power purchases a portion of its electricity needs from the wholesale market.
Details of Georgia Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
60.359.7 
Total purchased power (in billions of KWHs)
29.633.6 
Sources of generation (percent) —
Gas49 48 
Nuclear(a)
29 27 
Coal19 21 
Hydro and other3 
Cost of fuel, generated (in cents per net KWH)
Gas3.07 5.06 
Nuclear(a)
0.82 0.75 
Coal5.59 4.12 
Average cost of fuel, generated (in cents per net KWH)(a)
2.90 3.64 
Average cost of purchased power (in cents per net KWH)(b)
4.63 7.88 
(a)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(b)Average cost of purchased power includes fuel purchased by Georgia Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $3.1 billion in 2023, a decrease of $1.7 billion, or 35.4%, compared to 2022. The decrease was due to decreases of $1.4 billion related to the average cost of fuel and purchased power and $321 million related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through Georgia Power's fuel cost recovery mechanism. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Fuel
Fuel expense was $1.8 billion in 2023, a decrease of $0.7 billion, or 28.4%, compared to 2022. The decrease was primarily due to decreases of 39.3% in the average cost per KWH generated by natural gas and 8.9% in the volume of KWHs generated by coal, partially offset by increases of 35.7% in the average cost per KWH generated by coal, 9.3% in the average cost per KWH generated by nuclear, 8.5% in the volume of KWHs generated by nuclear, and 2.1% in the volume of KWHs generated by natural gas.
Purchased Power – Non-Affiliates
Purchased power expense from non-affiliates was $517 million in 2023, a decrease of $339 million, or 39.6%, compared to 2022. The decrease was primarily due to a decrease of 33.9% in the volume of KWHs purchased due to lower demand and the availability of lower cost generation in the Southern Company system and a decrease of 22.3% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
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Purchased Power – Affiliates
Purchased power expense from affiliates was $764 million in 2023, a decrease of $637 million, or 45.5%, compared to 2022. The decrease was primarily due to a decrease of 49.1% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $266 million, or 11.3%, in 2023 as compared to 2022. The decrease was primarily due to decreases of $182 million in storm damage recovery as authorized in the 2022 ARP, $178 million in transmission and distribution utilities.
Theexpenses primarily associated with line maintenance, $74 million in generation non-outage maintenance expenses, and $28 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $60 million from unregulated power delivery construction and maintenance and energy conservation projects, $59 million in generation environmental projects, $55 million in technology infrastructure and application production costs, and $28 million in planned generation outages. See Note 2 to the financial statements reflect Southern Company's investmentsunder "Georgia Power – Storm Damage Recovery" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $251 million, or 17.6%, in 2023 as compared to 2022 primarily due to increases of $190 million resulting from higher depreciation rates as authorized in the subsidiaries2022 ARP and $75 million associated with additional plant in service, partially offset by a decrease of $15 million in amortization of regulatory assets related to the retirement of certain generating units that ended in 2022.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $14 million, or 2.7%, in 2023 as compared to 2022 primarily due to an increase of $56 million in property taxes primarily resulting from an increase in the assessed value of property, largely offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $25 million, or 17.9%, in 2023 as compared to 2022 primarily due to an increase in capital expenditures subject to AFUDC.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $141 million, or 29.1%, in 2023 as compared to 2022. The increase primarily reflects approximately $78 million related to higher interest rates and $76 million related to higher average outstanding borrowings, partially offset by the deferral of $14 million in financing costs related to Plant Vogtle Unit 3. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information. Also see Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
Other Income (Expense), Net
Other income (expense), net decreased $6 million, or 3.4%, in 2023 as compared to 2022 primarily due to decreases in non-service cost-related retirement benefits income and customer charges related to contributions in aid of construction, partially offset by a consolidated basis.decrease in charitable donations. See Note 11 to the financial statements for additional information on Georgia Power's net periodic pension and other postretirement benefit costs.
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Income Taxes (Benefit)
Income taxes increased $78 million, or 21.1%, in 2023 as compared to 2022 primarily due to the flowback of $145 million of certain excess deferred income taxes that ended in 2022 and higher pre-tax earnings largely resulting from lower charges associated with the construction of Plant Vogtle Units 3 and 4, partially offset by an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards, generation of $35 million of advanced nuclear PTCs, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" and Note 10to the financial statements for additional information.
Mississippi Power
Mississippi Power's net income was $188 million in 2023 compared to $164 million in 2022. The equity method is usedincrease was primarily due to an increase in affiliate wholesale capacity revenues, changes in power supply agreements, and a decrease in non-fuel operations and maintenance expenses, partially offset by an increase in interest expense.
A condensed income statement for entitiesMississippi Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$1,474 $(220)
Fuel and purchased power538 (251)
Other operations and maintenance362 (14)
Depreciation and amortization190 9 
Taxes other than income taxes124  
Total operating expenses1,214 (256)
Operating income260 36 
Interest expense, net of amounts capitalized71 15 
Other income (expense), net35 2 
Income taxes36 (1)
Net income$188 $24 
Operating Revenues
Operating revenues for 2023 were $1.5 billion, reflecting a $220 million, or 13.0%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$935 
Estimated change resulting from —
Rates and pricing(11)
Sales growth11 
Weather(4)
Fuel and other cost recovery32 
Retail — current year$963 $935 
Wholesale revenues —
Non-affiliates272 252 
Affiliates200 460 
Total wholesale revenues472 712 
Other operating revenues39 47 
Total operating revenues$1,474 $1,694 
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Total retail revenues for 2023 increased $28 million, or 3.0%, compared to 2022 primarily due to higher recoverable fuel costs and an increase in whichcustomer usage, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and lower revenues associated with a tolling arrangement accounted for as a sales-type lease. See Notes 2 and 9 to the Company has significant influence but doesfinancial statements under "Mississippi Power" and "Lessor," respectively, for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates for Mississippi Power include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not controlaffect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside Mississippi Power's service territory. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" for variable interest entities whereadditional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
20232022
(in millions)
Capacity and other$21 $
Energy251 249 
Total non-affiliated$272 $252 
Wholesale revenues from sales to non-affiliates increased $20 million, or 7.9%, compared to 2022. The increase was primarily due to capacity revenues associated with new capacity contracts in 2023.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the Company has an equity investment but is notmarket prices of wholesale energy compared to the primary beneficiary. Intercompany transactions have been eliminated in consolidation.
The traditional electric operating companies, Southern Power, certain subsidiariescost of Mississippi Power's and the Southern Company Gas,system's generation, demand for energy within the Southern Company system's electric service territory, and certain other subsidiariesthe availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. In addition, Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC,FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023. Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Mississippi Power's variable cost to produce the energy. See Note 2 under "Mississippi Power – Municipal and Rural Associations Tariff" for additional information.
Wholesale revenues from sales to affiliates decreased $260 million, or 56.5%, in 2023 compared to 2022. The decrease was primarily due to a $293 million decrease associated with lower natural gas prices, partially offset by a $23 million increase in capacity revenues resulting from availability of generation reserves and an increase in pricing and a $10 million increase associated with higher KWH sales.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. The energy portion of these transactions does not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues decreased $8 million, or 17.0%, as compared to 2022 primarily due to decreases of $5 million in unregulated sales associated with power delivery construction and maintenance projects and $3 million in open access transmission tariff revenues.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted Percent Change(*)
(in millions)
Residential2,092 (1.9)%0.7 %
Commercial2,815 7.0 7.1 
Industrial4,721 0.7 0.7 
Other28 (11.1)(11.1)
Total retail9,656 1.8 %2.5 %
Wholesale
Non-affiliated3,836 10.7 
Affiliated5,612 2.2 
Total wholesale9,448 5.5 
Total energy sales19,104 3.6 %
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Mississippi Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales increased in 2023 when compared to 2022. Weather-adjusted residential KWH sales increased 0.7% due to an increase in customer usage. Weather-adjusted commercial KWH sales increased 7.1% primarily due to customer growth. Industrial KWH sales increased 0.7% primarily due to an increase in the non-manufacturing sector, partially offset by a decrease in the chemicals sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Mississippi Power purchases a portion of its electricity needs from the wholesale market.
Details of Mississippi Power's generation and purchased power were as follows:
20232022
Total generation (in millions of KWHs)
18,789 18,303 
Total purchased power (in millions of KWHs)
524 617 
Sources of generation (percent) –
Gas92 90 
Coal8 10 
Cost of fuel, generated (in cents per net KWH) –
Gas2.68 4.34 
Coal5.46 4.13 
Average cost of fuel, generated (in cents per net KWH)
2.90 4.31 
Average cost of purchased power (in cents per net KWH)
4.27 6.91 
Fuel and purchased power expenses were $538 million in 2023, a decrease of $251 million, or 31.8%, as compared to 2022. The decrease was primarily due to a $266 million decrease related to the average cost of fuel and purchased power, partially offset by a $15 million net increase related to the volume of KWHs generated and purchased.
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Fuel and purchased power energy transactions do not have a significant impact on earnings since energy expenses are generally offset by energy revenues through Mississippi Power's fuel cost recovery clauses. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" and Note 1 to the financial statements under "Fuel Costs" for additional information.
Fuel expense decreased $230 million, or 30.8%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost of natural gas per KWH generated and a 20.3% decrease in the volume of KWHs generated by coal, partially offset by a 32.2% increase in the average cost of coal per KWHs generated and a 5.4% increase in the volume of KWHs generated by natural gas.
Purchased power expense decreased $21 million, or 49.9%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 15.1% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $14 million, or 3.7%, in 2023 compared to 2022. The decrease was primarily due to decreases of $14 million in reliability reserve accruals, $7 million in generation expenses, and $6 million in unregulated power delivery construction and maintenance projects, partially offset by increases of $5 million in storm reserve accruals and $2 million in certain employee compensation and benefit expenses. See Note 2 to the financial statements under "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $9 million, or 5.0%, in 2023 compared to 2022 primarily due to an increase in depreciation associated with additional plant in service.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $15 million, or 26.8%, in 2023 compared to 2022. The increase was primarily due to increases of approximately $10 million related to higher interest rates and $5 million related to higher average outstanding borrowings. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information.
Income Taxes
Income taxes decreased $1 million, or 2.7%, in 2023 compared to 2022 primarily due to a decrease of $7 million associated with the flowback of certain excess deferred income taxes associated with new PEP rates that became effective in April 2023, largely offset by an increase of $6 million associated with higher pre-tax earnings. See Note 2 to the financial statements under "Mississippi Power – Performance Evaluation Plan" and Note 10 to the financial statements for additional information.
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Southern Power
Net income attributable to Southern Power for 2023 was $357 million, a $3 million increase from 2022. The increase was primarily due to higher HLBV income associated with tax equity partnerships, an arbitration award received for losses previously incurred, a gain on the sale of spare parts, and receipts of liquidated damages and insurance proceeds related to generation facility production and equipment, as well as changes in state apportionment methodology related to tax legislation enacted by the State of Tennessee. These increases were largely offset by lower revenues driven by lower market prices of energy.
A condensed statement of income follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$2,189 $(1,180)
Fuel706 (908)
Purchased power116 (195)
Other operations and maintenance473 (9)
Depreciation and amortization504 (12)
Taxes other than income taxes51 2 
Loss on sales-type leases (1)
Gain on dispositions, net(20)(18)
Total operating expenses1,830 (1,141)
Operating income359 (39)
Interest expense, net of amounts capitalized129 (9)
Other income (expense), net12 5 
Income taxes (benefit)12 (8)
Net income230 (17)
Net loss attributable to noncontrolling interests(127)(20)
Net income attributable to Southern Power$357 $3 
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company power pool.
Natural Gas Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to operating income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of Southern Power's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have capacity revenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy generated from the respective facility and sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.
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See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.
Operating Revenues Details
Details of Southern Power's operating revenues were as follows:
20232022
(in millions)
PPA capacity revenues$471 $451 
PPA energy revenues1,227 2,121 
Total PPA revenues1,698 2,572 
Non-PPA revenues436 761 
Other revenues55 36 
Total operating revenues$2,189 $3,369 
Operating revenues for 2023 were $2.2 billion, a $1.2 billion, or 35.0% decrease from 2022. The change in operating revenues was primarily due to the following:
PPA capacity revenuesincreased $20 million, or 4.4%, primarily due to an increase associated with a change in rates from new and existing natural gas PPAs.
PPA energy revenues decreased $894 million, or 42.1%, primarily due to a $904 million decrease in sales under natural gas PPAs resulting from a $726 million decrease in the price of fuel and purchased power and a $178 million decrease in the volume of KWHs sold.
Non-PPA revenues decreased $325 million, or 42.7%, primarily due to a $650 million decrease in the market price of energy, partially offset by a $321 million increase in the volume of KWHs sold through short-term sales.
Other revenues increased $19 million, or 52.8%, primarily due to receipts of liquidated damages associated with generation facility production guarantees, an arbitration award received for losses previously incurred, and business interruption insurance proceeds for damaged generation equipment. See Note 3 to the financial statements under "General Litigation Matters – Southern Power" for additional information.
Fuel and Purchased Power Expenses
Details of Southern Power's generation and purchased power were as follows:
Total
KWHs
Total KWH % ChangeTotal
KWHs
20232022
(in billions of KWHs)
Generation4948
Purchased power33
Total generation and purchased power522.0%51
Total generation and purchased power (excluding solar, wind, fuel cells, and tolling agreements)
336.5%31
Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
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Details of Southern Power's fuel and purchased power expenses were as follows:
20232022
(in millions)
Fuel$706 $1,614 
Purchased power116 311 
Total fuel and purchased power expenses$822 $1,925 
In 2023, total fuel and purchased power expenses decreased $1.1 billion, or 57.3%, compared to 2022. Fuel expensedecreased $908 million, or 56.3%, primarily due to a $1.0 billion decrease associated with the average cost of fuel. Purchased power expense decreased $195 million, or 62.7%, primarily due to a $206 million decrease associated with the average cost of purchased power.
Gain on Dispositions, Net
In 2023, gain on dispositions, net increased $18 million compared to 2022 primarily due to a $16 million gain on the sale of spare parts in 2023.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized decreased $9 million, or 6.5%, compared to 2022. The decrease was primarily due to lower average outstanding borrowings.
Income Taxes (Benefit)
In 2023, income taxes decreased $8 million, or 40.0%, compared to 2022. The decrease was primarily due to a change in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in the second quarter 2023. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate," respectively, for additional information.
Net Loss Attributable to Noncontrolling Interests
In 2023, net loss attributable to noncontrolling interests increased $20 million, or 18.7%, compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to wind tax equity partners and $5 million in lower income allocations to equity partners, partially offset by $10 million in lower HLBV loss allocations to battery energy storage partners.
Southern Company Gas
Southern Company Gas has various regulatory mechanisms, such as weather and revenue normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of its utility's respective service territory. Southern Company Gas also utilizes weather hedges to limit the negative income impacts in the event of warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. Therefore, weather typically does not have a significant net income impact.
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas and bad debt expense, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing Southern Company Gas' annual results. Thus, Southern Company Gas' operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
Percent Generated During
Heating Season
Operating RevenuesNet
Income
202367 %73 %
202267 %66 %
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Net Income
Net income attributable to Southern Company Gas in 2023 was $615 million, an increase of $43 million, or 7.5%, compared to 2022. Net income increased primarily as a result of an impairment charge in 2022 related to the sale of natural gas storage facilities. The increase in net income was partially offset by a decrease of $29 million in net income at gas distribution operations primarily as a result of reduced revenue due to lower volumes sold, regulatory disallowances at Nicor Gas, and higher depreciation related to continued investment in infrastructure replacement programs, partially offset by lower cost of gas, and a $9 million decrease in net income at gas pipeline investments primarily as a result of higher expenses at SNG.
A condensed income statement for Southern Company Gas follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Earnings before income taxes826 74 
Income taxes211 31 
Net Income$615 $43 
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from
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customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Customer Count
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas distribution operations' and gas marketing services' customers are primarily located in Georgia and Illinois.
The following table provides the number of customers served by Southern Company Gas at December 31, 2023 and 2022:
20232022
(in thousands, except market share %)
Gas distribution operations4,374 4,358 
Gas marketing services
Energy customers665 622 
Market share of energy customers in Georgia30.0 %29.3 %
Southern Company Gas anticipates customer growth and uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at gas distribution operations represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
In 2023, cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
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Volumes of Natural Gas Sold
Southern Company Gas' natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas.
The following table details the volumes of natural gas sold during all periods presented:
2023 vs. 2022
20232022% Change
Gas distribution operations (mmBtu in millions)
Firm625 707 (11.6)%
Interruptible93 93  
Total718 800 (10.3)%
Gas marketing services (mmBtu in millions)
Firm:
Georgia33 35 (5.7)%
Other19 18 5.6 
Interruptible large commercial and industrial14 14  
Total66 67 (1.5)%
Other Operations and Maintenance Expenses
In 2023, other operations and maintenance expenses increased $18 million, or 1.5%, compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Depreciation and Amortization
In 2023, depreciation and amortization increased $23 million, or 4.1%, compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
In 2023, taxes other than income taxes decreased $20 million, or 7.1%, compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized increased $47 million, or 17.9%, compared to 2022. The increase reflects $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
In 2023, income taxes increased $31 million, or 17.2%, compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes
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related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Segment Information
20232022
Operating RevenuesOperating ExpensesNet Income (Loss)Operating RevenuesOperating ExpensesNet Income (Loss)
(in millions)(in millions)
Gas distribution operations$4,105 $3,301 $441 $5,267 $4,464 $470 
Gas pipeline investments32 10 98 32 11 107 
Gas marketing services548 418 91 638 505 94 
All other36 40 (15)55 190 (99)
Intercompany eliminations(19)(6) (30)(22)— 
Consolidated$4,702 $3,763 $615 $5,962 $5,148 $572 
Gas Distribution Operations
Gas distribution operations is the largest component of Southern Company Gas' business and is subject to regulation and oversight by regulatory agencies in each of the states it serves. These agencies approve natural gas rates designed to provide Southern Company Gas with the opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest expense, operations and maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, Southern Company Gas' second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. Southern Company Gas has various regulatory and other mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit its exposure to changes in customer consumption, including weather changes within typical ranges in its natural gas distribution utilities' service territories. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income decreased $29 million, or 6.2%, compared to 2022. Operating revenues decreased $1.2 billion primarily due to lower gas cost recovery and lower volumes sold, partially offset by rate increases and continued investment in infrastructure replacement. Gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas. Operating expenses decreased $1.2 billion primarily due to a $1.3 billion decrease in the cost of natural gas as a result of lower gas prices compared to 2022 and lower taxes other than income taxes, partially offset by $88 million related to the regulatory disallowances at Nicor Gas, higher depreciation resulting from additional assets placed in service, higher compensation and benefits expenses, and a $20 million increase related to energy service contracts. The decrease in operating expenses also includes costs passed through directly to customers, primarily related to bad debt expenses, energy efficiency programs, and revenue taxes. The decrease in net income also includes an increase of $46 million in interest expense, net of amounts capitalized primarily due to higher interest rates and higher average outstanding debt, partially offset by a $19 million decrease in income taxes primarily as a result of the tax benefit resulting from the regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Gas Pipeline Investments
Gas pipeline investments consists primarily of joint ventures in natural gas pipeline investments including SNG and Dalton Pipeline. In 2023, net income decreased $9 million compared to 2022. The decrease was primarily due to lower earnings at SNG resulting from higher expenses. See Note 7 to the financial statements under "Southern Company Gas" for additional information.
Gas Marketing Services
Gas marketing services provides energy-related products and services to natural gas markets and participants in customer choice programs that were approved in various states to increase competition. These programs allow customers to choose their natural gas supplier while the local distribution utility continues to provide distribution and transportation services. Gas marketing
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services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts.
In 2023, net income decreased $3 million, or 3.2%, compared to 2022. The decrease was due to a $90 million decrease in operating revenues primarily due to lower gas prices and the timing of unrealized hedge losses, largely offset by an $87 million decrease in operating expenses primarily related to a $106 million decrease in cost of gas, partially offset by higher compensation and benefits.
All Other
All other includes natural gas storage businesses, a renewable natural gas business, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the reportable segments and interest income (expense) associated with affiliate financing arrangements. All other included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income increased $84 million compared to 2022. The increase was primarily due to a decrease in operating expenses primarily related to pre-tax impairment charges in 2022 totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities, lower depreciation, lower cost of gas, and lower taxes other than income taxes, partially offset by a decrease in operating revenues of $19 million and an increase in income taxes. See Note 10 to the financial statements and Note 15 to the financial statements under "Southern Company Gas"for additional information.
FUTURE EARNINGS POTENTIAL
General
Prices for electric service provided by the traditional electric operating companies and natural gas distribution service provided by the natural gas distribution utilities to retail customers are set by state PSCs or other applicable state regulatory agencies under cost-based regulatory principles. Retail rates and earnings are reviewed through various regulatory mechanisms and/or processes and may be adjusted periodically within certain limitations. Effectively operating pursuant to these regulatory mechanisms and/or processes and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the traditional electric operating companies and natural gas distribution utilities for the foreseeable future. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Southern Power continues to focus on long-term PPAs. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 2 to the financial statements for additional information about regulatory matters.
Each Registrant's results of operations are not necessarily indicative of its future earnings potential. The level of the Registrants' future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Registrants' primary businesses of selling electricity and/or distributing natural gas, as described further herein.
For the traditional electric operating companies, these factors include the ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs during a time of increasing costs, including those related to projected long-term demand growth, stringent environmental standards, including CCR rules, safety, system reliability and resiliency, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants and expanding and improving the transmission and distribution systems; continued customer growth; and the trends of higher inflation and reduced electricity usage per customer, especially in residential and commercial markets. For Georgia Power, other major factors are completing construction and start-up of Plant Vogtle Unit 4 and meeting the related cost and schedule projections.
Earnings in the electricity business will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, which could contribute to a net reduction in customer usage.
Global and U.S. economic conditions continue to be affected by higher-than-expected inflation that arose from the COVID-19 pandemic and associated policy responses of governments and central banks. In response to elevated inflation levels, the U.S. Federal Reserve raised interest rates faster than any rate increase cycle in the last 40 years. The actions by the U.S. Federal Reserve have helped to slow the rate of inflation and curtail economic activity. Although target levels of inflation have yet to be achieved, the U.S. Federal Reserve has indicated its current intention to pause future rate increases and evaluate rate cuts in the near term. The shifting economic policy variables and weakening of historic relationships among economic activity, prices, and employment have increased the uncertainty of future levels of economic activity, which will directly impact future energy demand and operating costs. Weakening economic activity increases the risk of slowing or declining energy sales. See RESULTS OF OPERATIONS herein for information on energy sales in the Southern Company system's service territory during 2023.
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The level of future earnings for Southern Power's competitive wholesale electric business depends on numerous factors including the parameters of the wholesale market and the efficient operation of its wholesale generating assets; Southern Power's ability to execute its growth strategy through the development, construction, or acquisition of renewable facilities and other energy projects while containing costs; regulatory matters; customer creditworthiness; total electric generating capacity available in Southern Power's market areas; Southern Power's ability to successfully remarket capacity as current contracts expire; renewable portfolio standards; continued availability of federal and state ITCs and PTCs, which could be impacted by future tax legislation; transmission constraints; cost of generation from units within the Southern Company power pool; and operational limitations. See "Income Tax Matters" herein for information regarding the IRA's expansion of the availability of federal ITCs and PTCs. Also see Notes 10 and 15 to the financial statements for additional information.
The level of future earnings for Southern Company Gas' primary business of distributing natural gas and its complementary businesses in the gas pipeline investments and gas marketing services sectors depends on numerous factors. These factors include the natural gas distribution utilities' ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs, including those related to projected long-term demand growth, safety, system reliability and resiliency, natural gas, and capital expenditures, including expanding and improving the natural gas distribution systems; the completion and subsequent operation of ongoing infrastructure and other construction projects; customer creditworthiness; and certain policies to limit the use of natural gas, such as the potential in Illinois and across certain other parts of the U.S. for state or municipal bans on the use of natural gas or policies designed to promote electrification. The volatility of natural gas prices has an impact on Southern Company Gas' customer rates, its long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services business to capture value from locational and seasonal spreads. Additionally, changes in commodity prices, primarily driven by tight gas supplies, geopolitical events, and diminished gas production, subject a portion of Southern Company Gas' operations to earnings variability and may result in higher natural gas prices. Additional economic factors may contribute to this environment. The demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis. Alternatively, a significant drop in oil and natural gas prices could lead to a consolidation of natural gas producers or reduced levels of natural gas production.
Earnings for both the electricity and natural gas businesses are subject to a variety of other factors. These factors include weather; competition; developing new and maintaining existing energy contracts and associated load requirements with wholesale customers; customer energy conservation practices; the use of alternative energy sources by customers; government incentives to reduce overall energy usage; fuel, labor, and material prices in an environment of heightened inflation and material and labor supply chain disruptions; and the price elasticity of demand. Demand for electricity and natural gas in the Registrants' service territories is primarily driven by the pace of economic growth or decline that may be affected by changes in regional and global economic conditions, which may impact future earnings.
Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023.
As part of its ongoing effort to adapt to changing market conditions, Southern Company continues to evaluate and consider a wide array of potential business strategies. These strategies may include business combinations, partnerships, and acquisitions involving other utility or non-utility businesses or properties, disposition of, or the sale of interests in, certain assets or businesses, internal restructuring, or some combination thereof. Furthermore, Southern Company may engage in new business ventures that arise from competitive and regulatory changes in the utility industry. Pursuit of any of the above strategies, or any combination thereof, may significantly affect the business operations, risks, and financial condition of Southern Company. In addition, Southern Power and Southern Company Gas regularly consider and evaluate joint development arrangements as well as acquisitions and dispositions of businesses and assets as part of their business strategies. See Note 15 to the financial statements for additional information.
Environmental Matters
The Southern Company system's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, avian and other wildlife and habitat protection, and other natural resources. The Southern Company system maintains comprehensive environmental compliance and GHG strategies to assess both current and upcoming requirements and compliance costs associated with these environmental laws and regulations. New or revised environmental laws and regulations could further affect many areas of operations for the Subsidiary Registrants. The costs required to comply with environmental laws and regulations and to achieve stated goals, including capital expenditures, operations and maintenance costs, and costs reflected in ARO liabilities, may impact future electric generating unit retirement and replacement decisions (which are generally subject to approval from the traditional electric operating companies' respective state PSCs), results of operations, cash flows, and/or financial condition. Related costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, or changing fuel sources for certain existing
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units, as well as related upgrades to the Southern Company system's transmission and distribution (electric and natural gas) systems. A major portion of these costs is expected to be recovered through retail and wholesale rates, including existing ratemaking and billing provisions. The ultimate impact of environmental laws and regulations and the GHG goals discussed herein cannot be determined at this time and will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed technology, fuel prices, the outcome of pending and/or future legal challenges and regulatory matters, and the ability to continue recovering the related costs, through rates for the traditional electric operating companies and the natural gas distribution utilities and/or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.
Alabama Power and Mississippi Power recover environmental compliance costs through separate mechanisms, Rate CNP Compliance and the ECO Plan, respectively. Georgia Power's base rates include an ECCR tariff that allows for the recovery of environmental compliance costs. The natural gas distribution utilities of Southern Company Gas generally recover environmental remediation expenditures through rate mechanisms approved by their applicable state regulatory agencies. See Notes 2 and 3 to the financial statements for additional information.
Southern Power's PPAs generally contain provisions that permit charging the counterparty for some of the new costs incurred as a result of changes in environmental laws and regulations. Since Southern Power's units are generally newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and/or operating any type of existing or future facility. The impact of such laws, regulations, and other considerations on Southern Power and subsequent recovery through PPA provisions cannot be determined at this time.
Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity and natural gas, which could negatively affect results of operations, cash flows, and/or financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which may have the potential to affect their demand for electricity and natural gas.
Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, estimated capital expenditures through 2028 based on the current environmental compliance strategy for the Southern Company system and the traditional electric operating companies are as follows:
20242025202620272028Total
(in millions)
Southern Company$150 $141 $112 $92 $30 $525 
Alabama Power45 47 40 35 19 186 
Georgia Power92 80 60 32 10 274 
Mississippi Power13 13 12 26 65 
These estimates do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See "Environmental Laws and Regulations– Greenhouse Gases" and "– Water Quality" herein for additional information. The Southern Company system also anticipates substantial expenditures associated with ash pond closure and groundwater monitoring under the CCR Rule and related state rules, which are reflected in the applicable Registrants' ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein and Note 6 to the financial statements for additional information.
Environmental Laws and Regulations
Air Quality
Since 1990, the Southern Company system reduced SO2 and NOX air emissions by 99% and 92%, respectively, through 2022. Since 2005, the Southern Company system reduced mercury air emissions by 97% through 2022.
On February 13, 2023, the EPA published a final rule disapproving 19 state implementation plans (SIPs), including the States of Alabama and Mississippi, under the interstate transport (good neighbor) provisions of the Clean Air Act for the 2015 Ozone National Ambient Air Quality Standards (NAAQS). On March 14, 2023 and March 15, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the EPA's disapproval of the Mississippi SIP in the U.S. Court of Appeals for the
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Fifth Circuit. On June 8, 2023, the U.S. Court of Appeals for the Fifth Circuit stayed the EPA's disapproval of the Mississippi SIP, pending appeal. On April 13, 2023 and April 14, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the EPA's disapproval of the Alabama SIP in the U.S. Court of Appeals for the Eleventh Circuit. On August 17, 2023, the U.S. Court of Appeals for the Eleventh Circuit stayed the EPA's disapproval of the Alabama SIP, pending appeal.
On June 5, 2023, the EPA published the 2015 Ozone NAAQS Good Neighbor federal implementation plan (FIP), which requires reductions in NOX emissions from sources in 23 states, including Alabama and Mississippi, to assure those states satisfy their Clean Air Act good neighbor obligations for the 2015 Ozone NAAQS. Georgia and North Carolina have approved interstate transport SIPs addressing the 2015 Ozone NAAQS and are not subject to this rule. On June 16, 2023 and June 27, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the FIP for Mississippi in the U.S. Court of Appeals for the Fifth Circuit. On August 4, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the FIP for Alabama in the U.S. Court of Appeals for the Eleventh Circuit. Both cases are being held in abeyance pending resolution of the Mississippi SIP disapproval and Alabama SIP disapproval cases, respectively.
In July and September 2023, the EPA published an Interim Final Rule and an updated Interim Final Rule that stays the implementation of the FIPs for states with judicially stayed SIP disapprovals, including Mississippi and Alabama, respectively. The Interim Final Rule revises the existing regulations to maintain currently applicable trading programs for those states.
The ultimate impact of the rule and associated legal matters cannot be determined at this time; however, implementation of the FIPs will likely result in increased compliance costs for the traditional electric operating companies.
Water Quality
In 2020, the EPA published the final steam electric ELG reconsideration rule (ELG Reconsideration Rule), a reconsideration of the 2015 ELG rule's limits on bottom ash transport water and flue gas desulfurization wastewater that extended the latest applicability date for both discharges to December 31, 2025. The ELG Reconsideration Rule also updated the voluntary incentive program and provided new subcategories for low utilization electric generating units and electric generating units that will permanently cease coal combustion by 2028. On March 29, 2023, the EPA published a proposed ELG Supplemental Rule revising certain effluent limits of the 2020 and 2015 ELG rules. The proposal imposes more stringent requirements for flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate to be met no later than December 31, 2029. The EPA is also proposing that a limited number of facilities already achieving compliance with the 2020 ELG Reconsideration Rule be allowed to elect retirement or repowering by December 31, 2032 as opposed to meeting the new more stringent requirements. The proposal maintains the 2020 ELG Reconsideration Rule's permanent cessation of coal combustion subcategory allowing units to continue to operate until the end of 2028 without having to install additional technologies. The proposal also maintains the Voluntary Incentive Program (VIP) subcategory, which allows units to comply with VIP limits by December 31, 2028. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
As required by the ELG Reconsideration Rule, in 2021, Alabama Power and Georgia Power each submitted initial notices of planned participation (NOPP) for applicable units seeking to qualify for these cessation of coal combustion or VIP subcategories that require compliance by December 31, 2028.
Alabama Power submitted its NOPP to the Alabama Department of Environmental Management (ADEM) indicating plans to retire Plant Barry Unit 5 (700 MWs) and to cease using coal and begin operating solely on natural gas at Plant Barry Unit 4 (350 MWs) and Plant Gaston Unit 5 (880 MWs). Alabama Power, as agent for SEGCO, indicated plans to retire Plant Gaston Units 1 through 4 (1,000 MWs). However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. The NOPP submittals are subject to the review of the ADEM. Plant Barry Unit 4 ceased using coal and began to operate solely on natural gas in December 2022. See Notes 2 and 7 to the financial statements under "Georgia Power – Integrated Resource Plans" and "SEGCO," respectively, for additional information.
The remaining assets for which Alabama Power has indicated retirement, due to early closure or repowering of the unit to natural gas, have net book values totaling approximately $1.2 billion (excluding capitalized asset retirement costs which are recovered through Rate CNP Compliance) at December 31, 2023. Based on an Alabama PSC order, Alabama Power is authorized to establish a regulatory asset to record the unrecovered investment costs, including the plant asset balance and the site removal and closure costs, associated with unit retirements caused by environmental regulations (Environmental Accounting Order). Under the Environmental Accounting Order, the regulatory asset would be amortized and recovered over an affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance. See Note 2 to the financial statements under "Alabama Power – Rate CNP Compliance" and " – Environmental Accounting Order" for additional information.
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Georgia Power submitted its NOPP to the Georgia Environmental Protection Division (EPD) indicating plans to retire Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership), which occurred in August 2022, Plant Bowen Units 1 and 2 (1,400 MWs), and Plant Scherer Unit 3 (614 MWs based on 75% ownership) on or before the compliance date of December 31, 2028. Georgia Power also submitted a NOPP indicating plans to pursue compliance with the ELG Reconsideration Rule for Plant Scherer Units 1 and 2 (137 MWs based on 8.4% ownership) through the voluntary incentive program by no later than December 31, 2028. Georgia Power intends to comply with the ELG Rules for Plant Bowen Units 3 and 4 through the generally applicable requirements by December 31, 2025; therefore, no NOPP submission was required for these units. The NOPP submittals and generally applicable requirements are subject to the review of the Georgia EPD and decisions related to retirement or continued operation of units are subject to Georgia PSC approval. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the management and disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (ash ponds) at active electric generating power plants. The CCR Rule requires landfills and ash ponds to be evaluated against a set of performance criteria and potentially closed if certain criteria are not met. Closure of existing landfills and ash ponds requires installation of equipment and infrastructure to manage CCR in accordance with the CCR Rule. In addition to the federal CCR Rule, the States of Alabama and Georgia finalized state regulations regarding the management and disposal of CCR within their respective states. In 2019, the State of Georgia received partial approval from the EPA for its state CCR permitting program, which has broader applicability than the federal rule. The State of Mississippi has not developed a state CCR permit program.
On August 14, 2023, the EPA published a proposal to deny the ADEM's CCR permit program application. Alabama Power's permits to close its CCR facilities remain valid under state law. In the absence of an EPA-approved state permit program, CCR facilities in Alabama will remain subject to both the federal and state CCR rules.
The Holistic Approach to Closure: Part A rule, finalized in 2020, revised the deadline to stop sending CCR and non-CCR wastes to unlined surface impoundments to April 11, 2021 and established a process for the EPA to approve extensions to the deadline. The traditional electric operating companies stopped sending CCR and non-CCR wastes to their unlined impoundments prior to April 11, 2021 and, therefore, did not submit requests for extensions. Beginning in January 2022, the EPA issued numerous Part A determinations that state its current positions on a variety of CCR Rule compliance requirements, such as criteria for groundwater corrective action and CCR unit closure. The traditional electric operating companies are working with state regulatory agencies to determine whether the EPA's current positions may impact closure and groundwater monitoring plans.
In April 2022, the Utilities Solid Waste Activities Group and a group of generating facility operators filed petitions for review in the U.S. Court of Appeals for the D.C. Circuit challenging whether the EPA's January 2022 actions establish new legislative rules that should have gone through notice-and-comment rulemaking. A decision by the court is expected in 2024. The ultimate impacts of the EPA's current positions are subject to the outcome of the pending litigation and any potential future rulemaking and cannot be determined at this time.
On May 18, 2023, the EPA published a proposed rule to establish two new categories of federally regulated CCR, legacy surface impoundments and CCR management units (CCRMUs). The proposal establishes accelerated compliance deadlines for legacy surface impoundments to meet regulatory requirements, including a requirement to initiate closure within 12 months after the effective date of the final rule. The EPA is also proposing a definition for CCRMUs. The EPA's proposal would also require facility evaluations to be completed at both active facilities and inactive facilities with one or more legacy surface impoundment to determine the presence or absence of CCRMUs. CCRMUs must comply with the CCR Rule's provisions for groundwater monitoring, corrective action, closure, and post-closure activities. On November 14, 2023, the EPA published a Notice of Data Availability supplementing the proposed rule, which sought comment on new data and a supplemental risk assessment that could be used to support final rulemaking. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
Based on requirements for closure and monitoring of landfills and ash ponds pursuant to the CCR Rule and applicable state rules, the traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to closure methodologies, schedules, and/or costs becomes available. Some of these updates have been, and future updates may be, material. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and the traditional electric operating companies could be materially impacted. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements," Notes 2 and 3 to the financial statements under "Georgia Power – Rate Plans" and "General Litigation Matters – Alabama Power," respectively, and Note 6 to the financial statements for additional information.
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Greenhouse Gases
On May 23, 2023, the EPA published proposed GHG standards and state plan guidelines for fossil fuel-fired power plants, which would require GHG limits for subcategories of both new and existing units based on technologies such as carbon capture and sequestration, low-GHG hydrogen co-firing, and natural gas co-firing. The proposed standards for new combustion turbines include subcategories for different operational uses including peaking, intermediate, and base load. Compliance with new source standards, once finalized, begins when the unit comes online. The proposed state plan guidelines for existing units include subcategories based on unit type, retirement date, size, and capacity factor. The EPA is proposing a 24-month state plan submission deadline for the existing unit implementation and may allow states to implement some limited form of trading and averaging for the state plans. Existing source compliance is proposed to begin as early as January 1, 2030, depending on the unit type and subcategory. The EPA also proposes to simultaneously repeal the Affordable Clean Energy rule. On November 17, 2023, the EPA published a final rule updating the regulations governing the processes and timelines for state and federal plans to implement existing source GHG performance standards. While this rule establishes the general requirements and timelines for states to follow in implementing the EPA's emissions guidelines, the pending final rule for GHG emissions from fossil fuel-fired power plants is expected to include schedules and other implementation requirements that will supersede these general provisions. On November 20, 2023, the EPA published a Supplemental Notice of Proposed Rulemaking for the pending rules for fossil fuel-fired power plants requesting additional input on how the EPA should address reliability concerns in the final rules. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
In 2021, the United States officially rejoined the Paris Agreement. The Paris Agreement establishes a non-binding universal framework for addressing GHG emissions based on nationally determined emissions reduction contributions and sets in place a process for tracking progress towards the goals every five years. In 2021, President Biden announced a new target for the United States to achieve a 50% to 52% reduction in economy-wide GHG emissions from 2005 levels by 2030. The target was accepted by the United Nations as the United States' nationally determined emissions reduction contribution under the Paris Agreement.
Additional GHG policies, including legislation, may emerge in the future requiring the United States to accelerate its transition to a lower GHG emitting economy; however, associated impacts are currently unknown. The Southern Company system has transitioned from an electric generating mix of 70% coal and 15% natural gas in 2007 to a mix of 17% coal and 54% natural gas in 2023. This transition has been supported in part by the Southern Company system retiring over 6,700 MWs of coal-fired generating capacity since 2010 and converting 3,700 MWs of generating capacity from coal to natural gas since 2015. In addition, the Southern Company system's capacity mix consists of over 11,600 MWs of renewable and storage facilities through ownership and long-term PPAs. See "Environmental Laws and Regulations – Water Quality" hereinfor information on plans to retire or convert to natural gas additional coal-fired generating capacity. In addition, Southern Company Gas has replaced over 6,000 miles of pipe material that was more prone to fugitive emissions (unprotected steel and cast-iron pipe), resulting in mitigation of more than 3.3 million metric tons of CO2 equivalents from its natural gas distribution system since 1998.
The following table provides the Registrants' 2022 and preliminary 2023 Scope 1 GHG emissions based on equity share of facilities:
2022Preliminary 2023
(in million metric tons of CO2 equivalent)
Southern Company(*)
8580
Alabama Power(*)
3528
Georgia Power2324
Mississippi Power99
Southern Power1313
Southern Company Gas(*)
22
(*)Includes GHG emissions attributable to disposed assets through the date of the applicable disposition and to acquired assets beginning with the date of the applicable acquisition. See Note 15 to the financial statements for additional information.
Southern Company system management has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Based on the preliminary 2023 emissions, the Southern Company system has achieved an estimated GHG emission reduction of 49% since 2007. GHG emissions decreased in 2023 when compared to 2022 as coal generation was displaced by lower carbon generation, including from Plant Vogtle Unit 3, as discussed further under RESULTS OF OPERATIONS – "Southern Company – Electricity Business" herein. Southern Company system management expects to achieve GHG reductions of greater than 50% as early as 2025, five years earlier than the established interim goal, and remain close to 50% through the late 2020s, followed thereafter by continued reductions. While none
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of Southern Company's subsidiaries are currently subject to renewable portfolio standards or similar requirements, management of the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. Southern Company system management plans to continue to pursue a diverse portfolio including low-carbon and carbon-free resources and energy efficiency resources; continue to transition the Southern Company system's generating fleet and make the necessary related investments in transmission and distribution systems; implement initiatives to reduce natural gas distribution operational emissions; continue its research and development with a particular focus on technologies that lower GHG emissions, including methods of removing carbon from the atmosphere; and constructively engage with policymakers, regulators, investors, customers, and other stakeholders to support outcomes leading to a net zero future.
Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and Southern Company Gas conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in their financial statements. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia (which represent substantially all of Southern Company Gas' accrued remediation costs) have all received authority from their respective state PSCs or other applicable state regulatory agencies. As such,agencies to recover approved environmental remediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the consolidated financial statements reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by relevant state PSCs or other applicable state regulatory agencies. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation. These reclassifications had no impact on Southern Company's results of operations, financial position, or cash flows.
In 2015, Georgia Power identified an error affecting the billing to a small number of large commercial and industrial customers under a rate plan allowing for variable demand-driven pricing from January 1, 2013 to June 30, 2015. In the second quarter 2015, Georgia Power recorded an out of period adjustment of approximately $75 million to decrease retail revenues, resulting in a decrease to net income of approximately $47 million. Georgia Power evaluated the effects of this error on the interim and annual periods that included the billing error. Based on an analysis of qualitative and quantitative factors, Georgia Power determined the error was not material to any affected period and, therefore, an amendment of previously filed financial statements was not required.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of Southern Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity or natural gas without a defined contractual term, as well as longer-term contractual commitments, including PPAs and non-derivative natural gas asset management and optimization arrangements.
Southern Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as certain PPAs, energy-related derivatives, and alternative revenue programs, are excluded from the scope of ASC 606 and, therefore, will be
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accounted for and disclosed or presented separately from revenues under ASC 606 on Southern Company's financial statements. Southern Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. Southern Company applied the modified retrospective method of adoption effective January 1, 2018. Southern Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged and there is no change to the accounting for existing leveraged leases. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and Southern Company will adopt the new standard effective January 1, 2019.
Southern Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, Southern Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to cellular towers and PPAs where certain of Southern Company's subsidiaries are the lessee and to land and outdoor lighting where certain of Southern Company's subsidiaries are the lessor. The traditional electric operating companies are currently analyzing pole attachment agreements, and a lease determination has not been made at this time. While Southern Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on Southern Company's balance sheet.
Other
In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). ASU 2016-09 changes the accounting for income taxes and the cash flow presentation for share-based payment award transactions effective for fiscal years beginning after December 15, 2016. The new guidance requires all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation to be recognized as income tax expense or benefit in the income statement. Previously, Southern Company recognized any excess tax benefits and deficiencies related to the exercise and vesting of stock compensation as additional paid-in capital. In addition, the new guidance requires excess tax benefits for share-based payments to be included in net cash provided from operating activities rather than net cash provided from financing activities on the statement of cash flows. Southern Company elected to adopt the guidance in 2016 and reflect the related adjustments as of January 1, 2016. Prior year's data presented in the financial statements has not been adjusted. Southern Company also elected to recognize forfeitures as they occur. The new guidance did not have a material impact on the results of operations, financial position, or cash flows of Southern Company. See Notes 5 and 8 for disclosures impacted by ASU 2016-09.
In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18). ASU 2016-18 eliminates the need to reflect transfers between cash and restricted cash in operating, investing, and financing activities in the statement of cash flows. Upon adoption, the net change in cash and cash equivalents during the period will include amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, and will be applied retrospectively to each period presented. Southern Company adopted ASU 2016-18 effective January 1, 2018 with no material impact on its financial statements.
On January 26, 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-04). ASU 2017-04 removes the requirement to compare the implied fair value of goodwill with the carrying amount as part of Step 2 of the goodwill impairment test. Under the new standard, the goodwill impairment loss will be measured as the excess of a reporting unit's carrying amount over its fair value, not exceeding the total amount of goodwill allocated to that reporting unit, which may increase the frequency of goodwill impairment charges if a future goodwill impairment test does not pass the Step 1 evaluation. ASU 2017-04 is effective prospectively for periods beginning on or after
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December 15, 2019, with early adoption permitted. Southern Company adopted ASU 2017-04 effective January 1, 2018 with no impact on its financial statements.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in Southern Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. Southern Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. Southern Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
Regulatory Assets and Liabilities
The traditional electric operating companies and natural gas distribution utilities are subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process.
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Regulatory assets and (liabilities) reflected in the balance sheets at December 31 relate to:
 2017 2016 Note
 (in millions)  
Retiree benefit plans$3,931
 $3,959
 (a,n)
Asset retirement obligations-asset1,133
 1,080
 (b,n)
Deferred income tax charges814
 1,590
 (b,p)
Environmental remediation-asset511
 491
 (j,n)
Property damage reserves-asset333
 206
 (i)
Under recovered regulatory clause revenues317
 273
 (g)
Remaining net book value of retired assets306
 351
 (o)
Loss on reacquired debt223
 243
 (c)
Vacation pay183
 182
 (f,n)
Long-term debt fair value adjustment138
 155
 (d)
Deferred PPA charges119
 141
 (e,n)
Kemper County energy facility88
 201
 (h)
Other regulatory assets511
 487
 (k)
Deferred income tax credits(7,261) (219) (b,p)
Other cost of removal obligations(2,684) (2,774) (b)
Over recovered regulatory clause revenues(155) (203) (g)
Property damage reserves-liability(135) (177) (l)
Other regulatory liabilities(266) (120) (m)
Total regulatory assets (liabilities), net$(1,894) $5,866
  
Note: The recovery and amortization periodsGas may be liable for these regulatory assets and (liabilities) are as follows:
(a)Recovered and amortized over the average remaining service period which may range up to 15 years. See Note 2 for additional information.
(b)Asset retirement and other cost of removal obligations are recorded, deferred income tax assets are recovered, and deferred income tax liabilities are amortized over the related property lives, which may range up to 80 years. Asset retirement and removal liabilities will be settled and trued up following completion of the related activities.
(c)Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue, which may range up to 50 years.
(d)
Recovered over the remaining life of the original debt issuances, which range up to 21 years. For additional information see Note 12 under "Southern CompanyMerger with Southern Company Gas."
(e)Recovered over the life of the PPA for periods up to six years.
(f)Recorded as earned by employees and recovered as paid, generally within one year. This includes both vacation and banked holiday pay.
(g)Recorded and recovered or amortized as approved or accepted by the appropriate state PSCs or other applicable regulatory agencies over periods generally not exceeding 10 years.
(h)
Includes $114 million of regulatory assets and $26 million of regulatory liabilities to be recovered over periods of eight and six years, respectively. For additional information, see Note 3 under "Kemper County Energy FacilityRate RecoveryKemper Settlement Agreement."
(i)
Previous under-recovery as of December 2013 is recorded and recovered or amortized as approved by the Georgia PSC through 2019. Amortization of $319 million related to the under-recovery from January 2014 through December 2017 is expected to be determined by the Georgia PSC in the 2019 base rate case. See Note 3 under "Regulatory MattersGeorgia PowerStorm Damage Recovery" for additional information.
(j)Recovered through environmental cost recovery mechanisms when the remediation is performed or the work is performed.
(k)Comprised of numerous immaterial components including nuclear outage, fuel-hedging losses, deferred income tax charges - Medicare subsidy, cancelled construction projects, building and generating plant leases, property tax, and other miscellaneous assets. These costs are recorded and recovered or amortized as approved by the appropriate state PSCs over periods generally not exceeding 50 years.
(l)Recovered as storm restoration and potential reliability-related expenses are incurred as approved by the appropriate state PSCs.
(m)Comprised of numerous immaterial components including retiree benefit plans, fuel-hedging gains, AROs, and other liabilities that are recorded and recovered or amortized as approved by the appropriate state PSCs or other applicable regulatory agencies generally over periods not exceeding 20 years.
(n)Not earning a return as offset in rate base by a corresponding asset or liability.
(o)Amortized as approved by the appropriate state PSCs over periods generally up to 48 years.
(p)
As a result of the Tax Reform Legislation, these accounts include certain deferred income tax assets and liabilities not subject to normalization. The recovery and amortization of these amounts will be determined by the appropriate state PSCs or other applicable regulatory agencies. See Note 3 under "Regulatory Matters" and Note 5 for additional information.
In the eventsome or all required cleanup costs for additional sites that a portion of a traditional electric operating company's or a natural gas distribution utility's operations is no longer subject to applicable accounting rules for rate regulation, such company would be required to write off to income or reclassify to accumulated OCI related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the traditional electric operating company or natural gas distribution utility would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities
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are to be reflected in rates.may require environmental remediation. See Note 3 to the financial statements under ""Environmental Remediation" for additional information.
Regulatory Matters
See OVERVIEW"Recent Developments" herein and Note 2 to the financial statements for a discussion of regulatory matters related to Alabama Power,," " – Georgia Power,," " – Gulf Mississippi Power,," and " – Southern Company Gas," including items that could impact the applicable Registrants' future earnings, cash flows, and/or financial condition.
Alabama Power
On July 14, 2023, Alabama Power issued a request for proposals of between 100 MWs and "Kemper County Energy Facility"1,200 MWs of capacity beginning no later than December 1, 2028, with consideration for additional information.commencement as early as 2025. Any purchases will depend upon the cost competitiveness of the respective offers, as well as other options available to Alabama Power, and would ultimately require approval by the Alabama PSC. The ultimate outcome of this matter cannot be determined at this time.
Revenues
Wholesale capacity revenues from PPAsConstruction Programs
The Subsidiary Registrants are recognized eitherengaged in continuous construction programs to accommodate existing and estimated future loads on a levelized basis overtheir respective systems. The Southern Company system strategy continues to include developing and constructing new electric generating facilities, expanding and improving the appropriate contract period or the amount billable under the contract terms. Energyelectric transmission and other revenues are recognized as services are provided. Unbilled revenues related to retail sales are accrued at the end of each fiscal period. Retail rates for the traditional electric operating companies and natural gas distribution utilities may include provisionssystems, and undertaking projects to adjust billings for fluctuations in fuelcomply with environmental laws and purchased gas costs, fuel hedging, the energy component of purchased power costs, and certain other costs. regulations.
For the traditional electric operating companies, revenuesmajor generation construction projects are adjusted for differences between these actual costs and amounts billedsubject to state PSC approval in current regulatedorder to be included in retail rates. Under or over recovered regulatory clause revenues are recordedThe largest construction project currently underway in the balance sheets and are recovered or returned to customers through adjustmentsSouthern Company system is Plant Vogtle Unit 4. See Note 2 to the billing factors.financial statements under "Georgia Power – Nuclear Construction" for additional information. Also see Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for information regarding Georgia Power's request with the Georgia PSC to develop, own, and operate three simple cycle combustion turbines at Plant Yates.
The tariffsSee Note 15 to the financial statements under "Southern Power" for severalinformation relating to Southern Power's construction of renewable energy facilities.
Southern Company Gas is engaged in various infrastructure improvement programs designed to update or expand the natural gas distribution systems of the natural gas distribution utilities include provisions which allow for the recognition of certain revenues priorto improve reliability and resiliency, reduce emissions, and meet operational flexibility and growth. The natural gas distribution utilities recover their investment and a return associated with these infrastructure programs through their regulated rates. See Note 2 to the time such revenuesfinancial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information on Southern Company Gas' construction program.
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See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein for additional information regarding the Registrants' capital requirements for their construction programs, including estimated totals for each of the next five years.
Southern Power's Power Sales Agreements
General
Southern Power has PPAs with some of the traditional electric operating companies, other investor-owned utilities, IPPs, municipalities, and other load-serving entities, as well as commercial and industrial customers. The PPAs are billedexpected to customers, so longprovide Southern Power with a stable source of revenue during their respective terms.
Many of Southern Power's PPAs have provisions that require Southern Power or the counterparty to post collateral or an acceptable substitute guarantee if (i) S&P or Moody's downgrades the credit ratings of the respective company to an unacceptable credit rating, (ii) the counterparty is not rated, or (iii) the counterparty fails to maintain a minimum coverage ratio. See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein for additional information.
Southern Power works to maintain and expand its share of the wholesale market. During 2023, Southern Power continued to be successful in remarketing up to 438 MWs of annual natural gas generation capacity to load-serving entities through several PPAs extending over the next 16 years. Market demand is being driven by load-serving entities replacing expired purchase contracts and/or retired generation, as the amounts recognized will be collectedwell as planning for future growth.
Natural Gas
Southern Power's electricity sales from customers within 24 months. Programsnatural gas facilities are primarily through long-term PPAs that consist of thistwo types of agreements. The first type, include weather normalization adjustments, revenue normalization mechanisms, and revenue true-up adjustments and are referred to as alternative revenue programs.a unit or block sale, is a customer purchase from a dedicated generating unit where all or a portion of the generation from that unit is reserved for that customer. Southern Power typically has the ability to serve the unit or block sale customer from an alternate resource. The second type, referred to as requirements service, provides that Southern Power serve the customer's capacity and energy requirements from a combination of the customer's own generating units and from Southern Power resources not dedicated to serve unit or block sales. Southern Power has rights to purchase power provided by the requirements customers' resources when economically viable.
Southern Company's electric utility subsidiaries and Southern Company Gas haveAs a diversified basegeneral matter, substantially all of customers. No single customer or industry comprises 10% or more of revenues. For all periods presented, uncollectible accounts averaged less than 1% of revenues.
Fuel Costs
Fuel coststhe PPAs provide that the purchasers are expensed asresponsible for either procuring the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. Fuel expense also includes the amortization(tolling agreements) or reimbursing Southern Power for substantially all of the cost of nuclear fuel or purchased power relating to the energy delivered under such PPAs. To the extent a particular generating facility does not meet the operational requirements contemplated in the PPAs, Southern Power may be responsible for excess fuel costs. With respect to fuel transportation risk, most of Southern Power's PPAs provide that the counterparties are responsible for the availability of fuel transportation to the particular generating facility.
Capacity charges that form part of the PPA payments are designed to recover fixed and a charge,variable operation and maintenance costs based on nuclear generation,dollars-per-kilowatt year. In general, to reduce Southern Power's exposure to certain operation and maintenance costs, Southern Power has LTSAs. See Note 1 to the financial statements under "Long-Term Service Agreements" for additional information.
Solar and Wind
Southern Power's electricity sales from solar and wind generating facilities are also primarily through long-term PPAs; however, these PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or provide Southern Power a certain fixed price for the permanent disposalelectricity sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of spent nuclear fuel.energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Generally, under the renewable generation PPAs, the purchasing party retains the right to keep or resell the associated renewable energy credits.
Income Tax Matters
Consolidated Income Taxes
The impact of certain tax events at Southern Company and/or its other subsidiaries can, and does, affect each Registrant's ability to utilize certain tax credits. See "Tax Credits" and ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Accounting for Income Taxes" herein and Note 10 to the financial statements for additional information.
II-46

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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Fuel Cost of Natural GasRecovery
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, Southern Company Gas charges its utility customers for natural gas consumed using natural gas cost recovery mechanisms set by the applicable state regulatory agencies. Under these mechanisms, all prudently-incurred natural gas costs are passed through to customers without markup, subject to regulatory review. Southern Company Gas defers or accrues the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period such that no operating income is recognized related to these costs. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred and accrued natural gas costs are included in the balance sheets as regulatory assets and regulatory liabilities, respectively.
Income and Other Taxes
Southern Company uses the liability method of accounting for deferred income taxes and provides deferred income taxes for all significant income tax temporary differences. Taxes that are collected from customers on behalf of governmental agencies to be remitted to these agencies are presented net on the statements of income. In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies and Southern Company Gas are amortized over the average lives of the related property with such amortization normally applied as a credit to reduce depreciation in the statements of income. Under current tax law, certain projects at Southern Power are eligible for federal ITCs or cash grants. Southern Power has elected to receive ITCs. The credits are recorded as a deferred credit and are amortized to income tax expense over the life of the asset. Furthermore, the tax basis of the asset is reduced by 50% of the credits received, resulting in a net deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. In addition, certain projects are eligible for federal PTCs, which are recorded to income tax expense based on KWH production.
Federal ITCs and PTCs, as well as state ITCs and other state tax credits available to reduce income taxes payable, were not fully utilized in 2017 and will be carried forward and utilized in future years. In addition, Southern Company is expected to have a consolidated federal net operating loss (NOL) carryforward for the 2017 tax year along with various state NOL carryforwards, which would result in income tax benefits in the future, if utilized. See Note 5 under "Current and Deferred Income TaxesTax Credit Carryforwards" and " Net Operating Loss" for additional information.
Southern Company recognizes tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 5 under "Unrecognized Tax Benefits" for additional information.
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Southern Company and Subsidiary Companies 2017 Annual Report

Property, Plant, and Equipment
Property, plant, and equipment is stated at original cost less any regulatory disallowances and impairments. Original cost includes: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and cost of equity funds used during construction.
The Southern Company system's property, plant, and equipment in service consisted of the following at December 31:
 2017 2016
 (in millions)
Electric utilities:   
Generation$51,279
 $48,836
Transmission11,562
 11,156
Distribution19,239
 18,418
General4,276
 4,629
Plant acquisition adjustment126
 126
Electric utility plant in service86,482
 83,165
Natural gas distribution utilities:   
Transportation and distribution13,078
 11,996
Utility plant in service99,560
 95,161
Information technology equipment and software752
 544
Communications equipment456
 424
Storage facilities1,598
 1,463
Other1,176
 824
Total other plant in service3,982
 3,255
Total plant in service$103,542
 $98,416
The cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed with the exception of nuclear refueling costs. In accordance with their respective state PSC orders, Alabama Power and Georgia Power defer and amortize nuclear refueling costs over the unit's operating cycle, which ranges from 18 to 24 months.
Assets acquired under a capital lease are included in property, plant, and equipment and are further detailed in the table below:

Asset Balances at
December 31,

2017
2016

(in millions)
Office buildings$216

$61
Nitrogen plant(*)


83
Computer-related equipment51

63
Gas pipeline6

6
Less: Accumulated amortization(72)
(69)
Balance, net of amortization$201

$144
(*)Represents a nitrogen supply agreement for the air separation unit of the Kemper County energy facility, which was terminated following the suspension of the gasifier portion of the project. See Note 6 under "Capital Leases" for additional information.
The amount of non-cash property additions recognized for the years ended December 31, 2017, 2016, and 2015 was $985 million, $1.3 billion, and $844 million, respectively. These amounts are comprised of construction-related accounts payable outstanding at each year end. Also, the amount of non-cash property additions associated with capitalized leases for the years ended December 31, 2017, 2016, and 2015 was $162 million, $18 million, and $13 million, respectively.
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Southern Company and Subsidiary Companies 2017 Annual Report

Depreciation and Amortization
Depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates, which approximated 2.9% in 2017 and 3.0% in each of 2016 and 2015. Depreciation studies are conducted periodically to update the composite rates. These studies are filed with the respective state PSC and/or other applicable state and federal regulatory agencies for the traditional electric operating companies and natural gas distribution utilities. Accumulated depreciation for utility plant in service totaled $30.8 billion and $29.3 billion at December 31, 2017 and 2016, respectively. When property subject to composite depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the plant are retired when the related property unit is retired. Certain of Southern Power's generation assets related to natural gas-fired facilities are depreciated on a units-of-production basis, using hours or starts, to better match outage and maintenance costs to the usage of, and revenues from, these assets.
Under the terms of the 2013 ARP, Georgia Power amortized approximately $14 million annually from 2014 through 2016 of its remaining regulatory liability related to other cost of removal obligations.
See Note 3 under "Regulatory MattersGulf PowerRetail Base Rate Cases" for information regarding depreciation and amortization adjustments related to the other cost of removal regulatory liability.
Depreciation of the original cost of other plant in service is provided primarily on a straight-line basis over estimated useful lives ranging from two to 65 years. Accumulated depreciation for other plant in service totaled $673 million and $550 million at December 31, 2017 and 2016, respectively.
Asset Retirement Obligations and Other Costs of Removal
AROs are computed as the present value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. Each traditional electric operating company and natural gas distribution utility has received accounting guidance from its state PSC or applicable state regulatory agency allowing the continued accrual or recovery of other retirement costs for long-lived assets that it does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as a regulatory liability and amounts to be recovered are reflected in the balance sheet as a regulatory asset.
The liability for AROs primarily relates to facilities that are subject to the Disposal of Coal Combustion Residuals from Electric Utilities final rule published by the EPA in 2015 (CCR Rule), principally ash ponds, and the decommissioning of the Southern Company system's nuclear facilities – Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 and 2. In addition, the Southern Company system has retirement obligations related to various landfill sites, asbestos removal, mine reclamation, land restoration related to solar and wind facilities, and disposal of polychlorinated biphenyls in certain transformers. The Southern Company system also has identified retirement obligations related to certain electric transmission and distribution facilities, certain wireless communication towers, property associated with the Southern Company system's rail lines and natural gas pipelines, and certain structures authorized by the U.S. Army Corps of Engineers. However, liabilities for the removal of these assets have not been recorded as the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO. The Company will continue to recognize in the statements of income allowed removal costs in accordance with regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability, as ordered by the various state PSCs, and are reflected in the balance sheets. See "Nuclear Decommissioning" herein for additional information on amounts included in rates.
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Southern Company and Subsidiary Companies 2017 Annual Report

Details of the AROs included in the balance sheets are as follows:
 2017 2016
 (in millions)
Balance at beginning of year$4,514
 $3,759
Liabilities incurred16
 66
Liabilities settled(177) (171)
Accretion179
 162
Cash flow revisions292
 698
Balance at end of year$4,824
 $4,514
In 2017 and 2016, the increases in cash flow revisions are primarily related to changes in closure strategy for ash ponds, landfills, and gypsum cells and the increases in liabilities settled are primarily related to ash pond closure activity.
The cost estimates for AROs related to the CCR Rule are based on information as of December 31, 2017 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure. As further analysis is performed and closure details are developed, the traditional electric operating companies will continue to periodically update these cost estimates as necessary.
Nuclear Decommissioning
The NRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. Alabama Power and Georgia Power have external trust funds (Funds) to comply with the NRC's regulations. Use of the Funds is restricted to nuclear decommissioning activities. The Funds are managed and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and state PSCs, as well as the IRS. While Alabama Power and Georgia Power are allowed to prescribe an overall investment policy to the Funds' managers, neither Southern Company nor its subsidiaries or affiliates are allowed to engage in the day-to-day management of the Funds or to mandate individual investment decisions. Day-to-day management of the investments in the Funds is delegated to unrelated third party managers with oversight by the management of Southern Company, Alabama Power, and Georgia Power. The Funds' managers are authorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the return on the Funds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities.
Southern Company records the investment securities held in the Funds at fair value, as disclosed in Note 10, as management believes that fair value best represents the nature of the Funds. Gains and losses, whether realized or unrealized, are recorded in the regulatory liability for AROs in the balance sheets and are not included in net income or OCI. Fair value adjustments and realized gains and losses are determined on a specific identification basis.
The Funds at Georgia Power participate in a securities lending program through the managers of the Funds. Under this program, the Funds' investment securities are loaned to institutional investors for a fee. Securities loaned are fully collateralized by cash, letters of credit, and/or securities issued or guaranteed by the U.S. government or its agencies or instrumentalities. As of December 31, 2017 and 2016, approximately $76 million and $56 million, respectively, of the fair market value of the Funds' securities were on loan and pledged to creditors under the Funds' managers' securities lending program. The fair value of the collateral received was approximately $77 million and $58 million at December 31, 2017 and 2016, respectively, and can only be sold by the borrower upon the return of the loaned securities. The collateral received is treated as a non-cash item in the statements of cash flows.
At December 31, 2017, investment securities in the Funds totaled $1.8 billion, consisting of equity securities of $1.1 billion, debt securities of $725 million, and $47 million of other securities. At December 31, 2016, investment securities in the Funds totaled $1.6 billion, consisting of equity securities of $878 million, debt securities of $685 million, and $41 million of other securities. These amounts include the investment securities pledged to creditors and collateral received and exclude receivables related to investment income and pending investment sales and payables related to pending investment purchases and the securities lending program.
Sales of the securities held in the Funds resulted in cash proceeds of $0.8 billion, $1.2 billion, and $1.4 billion in 2017, 2016, and 2015, respectively, all of which were reinvested. For 2017, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $233 million, which included $181 million related to unrealized gains on securities held in the Funds at December 31, 2017. For 2016, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $114 million, which included $48 million related to unrealized losses on securities held in the Funds at
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Southern Company and Subsidiary Companies 2017 Annual Report

December 31, 2016. For 2015, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $11 million, which included $83 million related to unrealized gains and losses on securities held in the Funds at December 31, 2015. While the investment securities held in the Funds are reported as trading securities, the Funds continue to be managed with a long-term focus. Accordingly, all purchases and sales within the Funds are presented separately in the statements of cash flows as investing cash flows, consistent with the nature of the securities and purpose for which the securities were acquired.
For Alabama Power, approximately $18 million and $19 million at December 31, 2017 and 2016, respectively, previously recorded in internal reserves is being transferred into the Funds through 2040 as approved by the Alabama PSC. The NRC's minimum external funding requirements are based on a generic estimate of the cost to decommission only the radioactive portions of a nuclear unit based on the size and type of reactor. Alabama Power and Georgia Power have filed plans with the NRC designed to ensure that, over time, the deposits and earnings of the Funds will provide the minimum funding amounts prescribed by the NRC.
At December 31, 2017 and 2016, the accumulated provisions for the external decommissioning trust funds were as follows:
 External Trust Funds
 2017 2016
 (in millions)
Plant Farley$902
 $790
Plant Hatch583
 511
Plant Vogtle Units 1 and 2346
 303
Site study cost is the estimate to decommission a specific facility as of the site study year. The decommissioning cost estimates are based on prompt dismantlement and removal of the plant from service. The actual decommissioning costs may vary from these estimates because of changes in the assumed date of decommissioning, changes in NRC requirements, or changes in the assumptions used in making these estimates. The estimated costs of decommissioning as of December 31, 2017 based on the most current studies, which were performed in 2013 for Alabama Power's Plant Farley and in 2015 for the Georgia Power plants, were as follows for Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 and 2:
 Plant Farley Plant Hatch 
Plant Vogtle
Units 1 and 2
Decommissioning periods:     
Beginning year2037
 2034
 2047
Completion year2076
 2075
 2079
 (in millions)
Site study costs:     
Radiated structures$1,362
 $678
 $568
Spent fuel management
 160
 147
Non-radiated structures80
 64
 89
Total site study costs$1,442
 $902
 $804
For ratemaking purposes, Alabama Power's decommissioning costs are based on the site study, and Georgia Power's decommissioning costs are based on the NRC generic estimate to decommission the radioactive portion of the facilities and the site study estimate for spent fuel management as of 2012. Under the 2013 ARP,On May 16, 2023, the Georgia PSC approved a stipulation agreement between Georgia Power and the staff of the Georgia PSC to increase annual fuel billings by 54%, or approximately $1.1 billion, effective June 1, 2023. The increase reflects a three-year recovery period for $2.2 billion of Georgia Power's annual decommissioning costunder recovered fuel balance at May 31, 2023. Changes in fuel rates have no significant effect on Southern Company's or Georgia Power's net income but do impact the related operating cash flows. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for ratemakingadditional information.
Integrated Resource Plans
On October 27, 2023, Georgia Power filed an updated IRP (2023 IRP Update) with the Georgia PSC, which sets forth a plan to support the recent increase in the state of $4 million and $2 million for Plant Hatch and Plant Vogtle Units 1 and 2, respectively.Georgia's projected energy needs since the 2022 IRP. Georgia Power expects the Georgia PSC to review and adjust, if necessary,render a final decision on the amounts collected in rates2023 IRP Update on April 16, 2024. The ultimate outcome of this matter cannot be determined at this time. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for nuclear decommissioning costs in Georgia Power's 2019 base rate case. Significant assumptions used to determine these costs for ratemaking were an inflation rate of 4.5% and 2.4% for Alabamaadditional information.
Mississippi Power
On October 27, 2023, the FERC approved a settlement agreement filed by Mississippi Power and Georgia Power, respectively,Cooperative Energy on July 31, 2023 related to Mississippi Power's July 2022 request for a $23 million increase in annual wholesale base revenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and a trust earnings raterefund to customers of 7.0% and 4.4% for Alabama Power and Georgia Power, respectively.
Amounts previously contributed to the Funds for Plant Farley are currently projected to be adequate to meet the decommissioning obligations. Alabama Power will continue to provide site-specific estimates of the decommissioning costs and related projections of funds in the external trust to the Alabama PSC and, if necessary, would seek the Alabama PSC's approval to address any changes in a manner consistent with NRC and other applicable requirements.
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Southern Company and Subsidiary Companies 2017 Annual Report

Allowance for Funds Used During Construction and Interest Capitalized
The traditional electric operating companies and certain of the natural gas distribution utilities record AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the plant through a higher rate base and higher depreciation. The equity component of AFUDC is not included in calculating taxable income. Interestapproximately $6 million primarily related to the constructiondifference between the approved rates and interim rates.
In October 2023, Mississippi Power signed an affiliate PPA with Georgia Power for 750 MWs of new facilities not includedcapacity, which began January 1, 2024 and will continue through December 2028. In order to fulfill this PPA and serve the interests of customers, Mississippi Power now expects electric generating units identified in its 2021 IRP to remain in service beyond the traditional electric operating companies' and natural gas distribution utilities' regulated ratespreviously indicated dates. Mississippi Power is capitalizedexpected to file its next IRP in April 2024 in accordance with standard interest capitalization requirements. AFUDCthe rules and interest capitalized, net of income taxes, as a percentage of net income, was 25.5%, 11.4%, and 12.8% for 2017, 2016, and 2015, respectively.
Cash payments for interest totaled $1.7 billion, $1.1 billion, and $809 million in 2017, 2016, and 2015, respectively, net of amounts capitalized of $89 million, $125 million, and $124 million, respectively.
Impairment of Long-Lived Assets
Southern Company evaluates long-lived assets for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance or an estimate of undiscounted future cash flows attributable to the assets, as compared with the carrying valueorders of the assets. If an impairment has occurred, the amount of the impairment recognized is determined by either the amount of regulatory disallowance or by estimating the fair value of the assets and recording a loss if the carrying value is greater than the fair value. For assets identified as held for sale, the carrying value is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change. See "Leveraged Leases" herein and Note 3 under "Other Matters" and "Kemper County Energy FacilitySchedule and Cost Estimate" for additional information.
Goodwill and Other Intangible Assets and Liabilities
Southern Company's goodwill and other intangible assets and liabilities primarily relate to Southern Company's 2016 acquisitions of PowerSecure and Southern Company Gas. See Note 12 under "Southern CompanyAcquisition of PowerSecure" and " – Merger with Southern Company Gas" for additional information. Also see Note 12 under "Southern Power" for additional information regarding other intangible assets related to Southern Power's PPA fair value adjustments.
At December 31, 2017 and 2016, goodwill was $6.3 billion. Goodwill is not amortized, but is subject to an annual impairment test during the fourth quarter of each year, or more frequently if impairment indicators arise. Southern Company evaluated its goodwill in the fourth quarter 2017 and determined that no impairment was required.
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Southern Company and Subsidiary Companies 2017 Annual Report

At December 31, 2017 and 2016, other intangible assets were as follows:
  At December 31, 2017 At December 31, 2016
 Estimated Useful LifeGross Carrying AmountAccumulated AmortizationOther
Intangible Assets, Net
 Gross Carrying AmountAccumulated AmortizationOther
Intangible Assets, Net
  (in millions) (in millions)
Other intangible assets subject to amortization:        
Customer relationships11-26 years$288
$(83)$205
 $268
$(32)$236
Trade names5-28 years159
(17)142
 158
(5)153
Storage and transportation contracts1-5 years64
(34)30
 64
(2)62
PPA fair value adjustments10-20 years456
(47)409
 456
(22)434
Other1-12 years17
(5)12
 11
(1)10
Total other intangible assets subject to amortization $984
$(186)$798

$957
$(62)$895
Other intangible assets not subject to amortization:        
Federal Communications Commission licenses 75

75
 75

75
Total other intangible assets $1,059
$(186)$873

$1,032
$(62)$970
Amortization associated with other intangible assets in 2017, 2016, and 2015 totaled $124 million, $50 million, and $3 million, respectively.
As of December 31, 2017, the estimated amortization associated with other intangible assets for the next five years is as follows:
 Amortization
 (in millions)
2018$95
201977
202065
202156
202251
Included in other deferred credits and liabilities on the balance sheet is $91 million of intangible liabilities that were recorded during acquisition accounting for transportation contracts at Southern Company Gas. At December 31, 2017, the accumulated amortization of these intangible liabilities was $50 million. The remaining estimated amortization associated with the intangible liabilities that will be recorded in natural gas revenues is as follows:
 Amortization
 (in millions)
2018$24
201917
Storm Damage Reserves
Each traditional electric operating company maintains a reserve to cover or is allowed to defer and recover the cost of damages from major storms to its transmission and distribution lines and generally the cost of uninsured damages to its generation facilities and other property. In accordance with their respective state PSC orders, the traditional electric operating companies accrued $41 million in 2017 and $40 million in each of 2016 and 2015. Alabama Power, Gulf Power, and Mississippi Power also have authority based on orders from their state PSCs to accrue certain additional amounts as circumstances warrant. In 2017, 2016, and 2015, there were no such additional accruals. See Note 3 under "Regulatory MattersAlabama PowerRate NDR" and
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Southern Company and Subsidiary Companies 2017 Annual Report

"Regulatory MattersGeorgia PowerStorm Damage Recovery" for additional information regarding Alabama Power's NDR and Georgia Power's deferred storm costs, respectively.
Leveraged Leases
A subsidiary of Southern Holdings has several leveraged lease agreements, with original terms ranging up to 45 years, which relate to international and domestic energy generation, distribution, and transportation assets. Southern Company receives federal income tax deductions for depreciation and amortization, as well as interest on long-term debt related to these investments. Southern Company reviews all important lease assumptions at least annually, or more frequently if events or changes in circumstances indicate that a change in assumptions has occurred or may occur. These assumptions include the effective tax rate, the residual value, the credit quality of the lessees, and the timing of expected tax cash flows.
The ability of the lessees to make required payments to the Southern Holdings subsidiary is dependent on the operational performance of the assets. In the last six months of 2017, the financial and operational performance of one of the lessees and the associated generation assets has raised significant concerns about the short-term ability of the generation assets to produce cash flows sufficient to support ongoing operations and the lessee's contractual obligations and its ability to make the remaining semi-annual lease payments to the Southern Holdings subsidiary beginning in June 2018. These operational challenges may also impact the expected residual value of the assets at the end of the lease term in 2047. If the June 2018 (or any future) lease payment is not paid in full, the Southern Holdings subsidiary may be unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. Failure to make the required payment to the debtholders would represent an event of default that would give the debtholders the right to foreclose on, and take ownership of, the generation assets from the Southern Holdings subsidiary, in effect terminating the lease and resulting in the write-off of the related lease receivable which had a balance of approximately $86 million as of December 31, 2017. Southern Company has evaluated the recoverability of the lease receivable and the expected residual value of the generation assets at the end of the lease under various scenarios and has concluded that its investment in the leveraged lease is not impaired as of December 31, 2017. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to make the required lease payments, including the lease payment due in June 2018.PSC. The ultimate outcome of this matter cannot be determined at this time.
Southern Company's net investment in domestic and international leveraged leases consists ofOn February 6, 2024, the following at December 31:
 2017 2016
 (in millions)
Net rentals receivable$1,498
 $1,481
Unearned income(723) (707)
Investment in leveraged leases775
 774
Deferred taxes from leveraged leases(252) (309)
Net investment in leveraged leases$523
 $465
A summary of the components of income from the leveraged leases follows:
 2017 2016 2015
 (in millions)
Pretax leveraged lease income$25
 $25
 $20
Net impact of Tax Reform Legislation48
 
 
Income tax expense(9) (9) (7)
Net leveraged lease income$64
 $16
 $13
Cash and Cash Equivalents
For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
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Southern Company and Subsidiary Companies 2017 Annual Report

Materials and Supplies
Generally, materials and supplies include the average cost of transmission, distribution, and generating plant materials. Materials are charged to inventory when purchased and then expensed or capitalized to plant, as appropriate, at weighted average cost when installed.
Fuel Inventory
Fuel inventory includes the average cost of coal, natural gas, oil, transportation, and emissions allowances of the electric utilities. Fuel is recorded to inventory when purchased and then expensed, at weighted average cost, as used and recoveredincrease retail fuel revenues by the traditional electric operating companies through fuel cost recovery rates approved by each state PSC. Emissions allowances granted by the EPA are included in inventory at zero cost.
Natural Gas for Sale
The natural gas distribution utilities,$18 million annually effective with the exceptionfirst billing cycle of Nicor Gas, carry natural gas inventory on a weighted average cost of gas (WACOG) basis.
Nicor Gas' natural gas inventory is carried at cost on a LIFO basis. Inventory decrements occurring during the year that are restored prior to year end are charged to cost of natural gas at the estimated annual replacement cost. Inventory decrements that are not restored prior to year end are charged to cost of natural gas at the actual LIFO cost of the inventory layers liquidated. The cost of natural gas, including inventory costs, is recovered from customers under a purchased gas recovery mechanism adjusted for differences between actual costs and amounts billed; therefore, LIFO liquidations have no impact on Southern Company's net income.
Natural gas inventories for Southern Company Gas' non-utility businesses are carried at the lower of weighted average cost or current market price, with cost determined on a WACOG basis. For any declines in market prices below the WACOG considered to be other than temporary, an adjustment is recorded to reduce the value of natural gas inventories to market value.
Financial Instruments
Southern Company and its subsidiaries use derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, electricity purchases and sales, and occasionally foreign currency exchange rates. All derivative financial instruments are recognized as either assets or liabilities on the balance sheets (included in "Other" or shown separately as "Risk Management Activities") and are measured at fair value. See Note 10 for additional information regarding fair value. Substantially all of the Southern Company system's bulk energy purchases and sales contracts that meet the definition of a derivative are excluded from fair value accounting requirements because they qualify for the "normal" scope exception, and are accounted for under the accrual method. Derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs result in the deferral of related gains and losses in OCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Any ineffectiveness arising from cash flow hedges is recognized currently in net income. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recorded on a net basis in the statements of income. Cash flows from derivatives are classified on the statements of cash flows in the same category as the hedged item. See Note 11 for additional information regarding derivatives.
The Company offsets fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a master netting arrangement. At December 31, 2017, the amount included in accounts payable in the balance sheets that the Company has recognized for the obligation to return cash collateral arising from derivative instruments was immaterial.
Southern Company is exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Company has established controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk.
Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income, changes in the fair value of qualifying cash flow hedges and marketable securities, certain changes in pension and other postretirement benefit plans, reclassifications for amounts included in net income, and dividends on preferred and preference stock of subsidiaries.
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Accumulated OCI (loss) balances, net of tax effects, were as follows:
 
Qualifying
Hedges
 
Pension and Other
Postretirement
Benefit Plans
 
Accumulated Other
Comprehensive
Income (Loss)
 (in millions)
Balance at December 31, 2016$(115) $(65) $(180)
Current period change(4) (5) (9)
Balance at December 31, 2017$(119) $(70) $(189)
2. RETIREMENT BENEFITS
Southern Company has a defined benefit, trusteed, pension plan covering substantially all employees, with the exception of employees at Southern Company Gas and PowerSecure. This qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2018. Southern Company also provides certain defined benefit pension plans for a selected group of management and highly compensated employees. Benefits under these non-qualified pension plans are funded on a cash basis. In addition, Southern Company provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The traditional electric operating companies fund related other postretirement trusts to the extent required by their respective regulatory commissions. For the year ending December 31, 2018, no other postretirement trust contributions are expected.
In addition, Southern Company Gas has a qualified defined benefit, trusteed, pension plan covering certain eligible employees, which was closed in 2012 to new employees and reopened to all non-union employees on January 1, 2018. This qualified pension plan is funded in accordance with requirements of ERISA. No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the Southern Company Gas qualified pension plan are anticipated for the year ending December 31, 2018. Southern Company Gas also provides certain non-qualified defined benefit and defined contribution pension plans for a selected group of management and highly compensated employees. Benefits under these non-qualified pension plans are funded on a cash basis. In addition, Southern Company Gas provides certain medical care and life insurance benefits for eligible retired employees through a postretirement benefit plan. Southern Company Gas also has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. For the year ending December 31, 2018, no other postretirement trust contributions are expected.
Actuarial Assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below.
Assumptions used to determine net periodic costs:2017 2016 2015
Pension plans     
Discount rate – benefit obligations4.40% 4.58% 4.17%
Discount rate – interest costs3.77
 3.88
 4.17
Discount rate – service costs4.81
 4.98
 4.48
Expected long-term return on plan assets7.92
 8.16
 8.20
Annual salary increase4.37
 4.37
 3.59
Other postretirement benefit plans     
Discount rate – benefit obligations4.23% 4.38% 4.04%
Discount rate – interest costs3.54
 3.66
 4.04
Discount rate – service costs4.64
 4.85
 4.39
Expected long-term return on plan assets6.84
 6.66
 6.97
Annual salary increase4.37
 4.37
 3.59
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Assumptions used to determine benefit obligations:2017
2016
Pension plans


Discount rate3.80%
4.40%
Annual salary increase4.32

4.37
Other postretirement benefit plans


Discount rate3.68%
4.23%
Annual salary increase4.32

4.37
The Company estimates the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of eight different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio.
An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO as of December 31, 2017 were as follows:
 Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached
Pre-656.50% 4.50% 2026
Post-65 medical5.00
 4.50
 2026
Post-65 prescription10.00
 4.50
 2026
An annual increase or decrease in the assumed medical care cost trend rate of 1% would affect the APBO and the service and interest cost components at December 31, 2017 as follows:
 1 Percent
Increase
 1 Percent
Decrease
 (in millions)
Benefit obligation$132
 $113
Service and interest costs4
 3
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Pension Plans
The total accumulated benefit obligation for the pension plans was $12.6 billion at December 31, 2017 and $11.3 billion at December 31, 2016. Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$12,385
 $10,542
Acquisitions
 1,244
Service cost293
 262
Interest cost455
 422
Benefits paid(596) (466)
Plan amendments(26) 39
Actuarial (gain) loss1,297
 342
Balance at end of year13,808
 12,385
Change in plan assets   
Fair value of plan assets at beginning of year11,583
 9,234
Acquisitions
 837
Actual return (loss) on plan assets1,953
 902
Employer contributions52
 1,076
Benefits paid(596) (466)
Fair value of plan assets at end of year12,992
 11,583
Accrued liability$(816) $(802)
At December 31, 2017, the projected benefit obligations for the qualified and non-qualified pension plans were $13.2 billion and $652 million, respectively. All pension plan assets are related to the qualified pension plans.
Amounts presented in the following tables exclude regulatory assets of $334 million associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company on July 1, 2016.
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's pension plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$3,273
 $3,207
Other current liabilities(53) (53)
Employee benefit obligations(763) (749)
Other regulatory liabilities, deferred(118) (87)
Accumulated OCI107
 100
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Presented below are the amounts included in accumulated OCI and regulatory assets at December 31, 2017 and 2016 related to the defined benefit pension plans that had not yet been recognized in net periodic pension cost along with the estimated amortization of such amounts for 2018.
 
Prior
Service
Cost
 Net (Gain) Loss
 (in millions)
Balance at December 31, 2017:   
Accumulated OCI$3
 $104
Regulatory assets14
 3,140
Total$17
 $3,244
Balance at December 31, 2016:   
Accumulated OCI$4
 $96
Regulatory assets51
 3,069
Total$55
 $3,165
Estimated amortization in net periodic pension cost in 2018:   
Accumulated OCI$1
 $9
Regulatory assets4
 204
Total$5
 $213
The components of OCI and the changes in the balance of regulatory assets related to the defined benefit pension plans for the years ended December 31, 2017 and 2016 are presented in the following table:
 
Accumulated
OCI
 Regulatory Assets
 (in millions)
Balance at December 31, 2015$125
 $2,998
Net (gain) loss(20) 243
Change in prior service costs2
 37
Reclassification adjustments:   
Amortization of prior service costs(1) (13)
Amortization of net gain (loss)(6) (145)
Total reclassification adjustments(7) (158)
Total change(25) 122
Balance at December 31, 2016$100
 $3,120
Net (gain) loss15
 227
Change in prior service costs
 (26)
Reclassification adjustments:   
Amortization of prior service costs(1) (11)
Amortization of net gain (loss)(7) (155)
Total reclassification adjustments(8) (166)
Total change7
 35
Balance at December 31, 2017$107
 $3,155
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Components of net periodic pension cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$293
 $262
 $257
Interest cost455
 422
 445
Expected return on plan assets(897) (782) (724)
Recognized net (gain) loss162
 150
 215
Net amortization12
 14
 25
Net periodic pension cost$25
 $66
 $218
Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Company has elected to amortize changes in the market value of all plan assets over five years rather than recognize the changes immediately. As a result, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets.
Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2017, estimated benefit payments were as follows:
 
Benefit
Payments
 (in millions)
2018$634
2019637
2020663
2021681
2022704
2023 to 20273,836
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Other Postretirement Benefits
Changes in the APBO and in the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$2,297
 $1,989
Acquisitions
 338
Service cost24
 22
Interest cost79
 76
Benefits paid(136) (119)
Actuarial (gain) loss65
 (16)
Plan amendments3
 
Retiree drug subsidy7
 7
Balance at end of year2,339
 2,297
Change in plan assets   
Fair value of plan assets at beginning of year944
 833
Acquisitions
 100
Actual return (loss) on plan assets154
 58
Employer contributions84
 65
Benefits paid(129) (112)
Fair value of plan assets at end of year1,053
 944
Accrued liability$(1,286) $(1,353)
Amounts presented in the following tables exclude regulatory assets of $77 million associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company on July 1, 2016.
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's other postretirement benefit plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$382
 $419
Other current liabilities(5) (4)
Employee benefit obligations(1,281) (1,349)
Other regulatory liabilities, deferred(41) (41)
Accumulated OCI4
 7
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Presented below are the amounts included in accumulated OCI and net regulatory assets (liabilities) at December 31, 2017 and 2016 related to the other postretirement benefit plans that had not yet been recognized in net periodic other postretirement benefit cost along with the estimated amortization of such amounts for 2018.
 
Prior
Service
Cost
 
Net (Gain)
Loss
 (in millions)
Balance at December 31, 2017:   
Accumulated OCI$
 $4
Net regulatory assets21
 320
Total$21
 $324
Balance at December 31, 2016:   
Accumulated OCI$
 $7
Net regulatory assets25
 353
Total$25
 $360
Estimated amortization as net periodic postretirement benefit cost in 2018:   
Net regulatory assets$7
 $14
The components of OCI, along with the changes in the balance of net regulatory assets (liabilities), related to the other postretirement benefit plans for the plan years ended December 31, 2017 and 2016 are presented in the following table:
 
Accumulated
OCI
 
Net Regulatory
Assets
(Liabilities)
 (in millions)
Balance at December 31, 2015$8
 $411
Net (gain) loss(1) (13)
Reclassification adjustments:   
Amortization of prior service costs
 (6)
Amortization of net gain (loss)
 (14)
Total reclassification adjustments
 (20)
Total change(1) (33)
Balance at December 31, 2016$7
 $378
Net (gain) loss(3) (21)
Change in prior service costs
 3
Reclassification adjustments:   
Amortization of prior service costs
 (6)
Amortization of net gain (loss)
 (13)
Total reclassification adjustments
 (19)
Total change(3) (37)
Balance at December 31, 2017$4
 $341
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Components of the other postretirement benefit plans' net periodic cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$24
 $22
 $23
Interest cost79
 76
 78
Expected return on plan assets(66) (60) (58)
Net amortization20
 21
 21
Net periodic postretirement benefit cost$57
 $59
 $64
Future benefit payments, including prescription drug benefits, reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans. Estimated benefit payments are reduced by drug subsidy receipts expected as a result of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 as follows:
 
Benefit
Payments
 
Subsidy
Receipts
 Total
 (in millions)
2018$144
 $(7) $137
2019148
 (8) 140
2020151
 (8) 143
2021154
 (9) 145
2022156
 (9) 147
2023 to 2027780
 (48) 732
Benefit Plan Assets
Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code of 1986, as amended (Internal Revenue Code). The Company's investment policies for both the pension plans and the other postretirement benefit plans cover a diversified mix of assets as described below. Derivative instruments may be used to gain efficient exposure to the various asset classes and as hedging tools. Additionally, the Company minimizes the risk of large losses primarily through diversification but also monitors and manages other aspects of risk.
The investment strategy for plan assets related to the Company's qualified pension plans is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plans is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Southern Company plan employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

Investment Strategies and Benefit Plan Asset Fair Values
A description of the major asset classes that the pension and other postretirement benefit plans are comprised of, along with the valuation methods used for fair value measurement, is provided below:
DescriptionValuation Methodology
Domestic equity: A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.

International equity: A mix of growth stocks and value stocks with both developed and emerging market exposure, managed both actively and through passive index approaches.
Domestic and International equities such as common stocks, American depositary receipts, and real estate investment trusts that trade on public exchanges are classified as Level 1 investments and are valued at the closing price in the active market. Equity funds with unpublished prices are valued as Level 2 when the underlying holdings are comprised of Level 1 or Level 2 equity securities.
Fixed income: A mix of domestic and international bonds.
Investments in fixed income securities are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Trust-owned life insurance (TOLI): Investments of the Company's taxable trusts aimed at minimizing the impact of taxes on the portfolio.
Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate accounts. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities.
Special situations: Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies, as well as investments in promising new strategies of a longer-term nature.

Real estate: Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities.

Private equity: Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.
Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.
The fair values, and actual allocations relative to the target allocations, of Southern Company's pension plan (excluding Southern Company Gas) as of December 31, 2017 and 2016 are presented below. The fair values presented are prepared in accordance with GAAP. For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate.
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

These fair values exclude cash, receivables related to investment income and pending investment sales, and payables related to pending investment purchases.
 Fair Value Measurements Using   
 Quoted Prices in Active Markets for Identical Assets
Significant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical Expedient Target AllocationActual Allocation
As of December 31, 2017:(Level 1)(Level 2)(Level 3)(NAV)Total
 (in millions)  
Assets:       
Domestic equity(*)
$2,405
$1,159
$
$
$3,564
26%31%
International equity(*)
1,555
1,403


2,958
25
25
Fixed income:     23
24
U.S. Treasury, government, and agency bonds
841


841


Mortgage- and asset-backed securities
8


8


Corporate bonds
1,201


1,201


Pooled funds
650


650


Cash equivalents and other217
11


228


Real estate investments469


1,188
1,657
14
13
Special situations


180
180
3
1
Private equity


669
669
9
6
Total$4,646
$5,273
$
$2,037
$11,956
100%100%
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

 Fair Value Measurements Using   
 Quoted Prices in Active Markets for Identical Assets
Significant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical Expedient Target AllocationActual Allocation
As of December 31, 2016:(Level 1)(Level 2)(Level 3)(NAV)Total
 (in millions)  
Assets:       
Domestic equity(*)
$2,010
$927
$
$
$2,937
26%29%
International equity(*)
1,231
1,110


2,341
25
22
Fixed income:     23
29
U.S. Treasury, government, and agency bonds
588


588


Mortgage- and asset-backed securities
13


13


Corporate bonds
991


991


Pooled funds
524


524


Cash equivalents and other996
2


998


Real estate investments310


1,152
1,462
14
13
Special situations



180
180
3
2
Private equity


549
549
9
5
Total$4,547
$4,155
$
$1,881
$10,583
100%100%
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
The fair values of Southern Company Gas' pension plan assets for the period ended December 31, 2017 and 2016 are presented below. The fair value measurements exclude cash, receivables related to investment income, pending investment sales, and payables related to pending investment purchases. Special situations (absolute return and hedge funds) investment assets are presented in the tables below based on the nature of the investment.
 Fair Value Measurements Using 
 Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical Expedient 
As of December 31, 2017:(Level 1)(Level 2)(Level 3)(NAV)Total
 (in millions)
Assets:     
Domestic equity(*)
$155
$323
$
$
$478
International equity(*)

166


166
Fixed income:     
U.S. Treasury, government, and agency bonds
85


85
Corporate bonds
39


39
Cash equivalents and other84
25

48
157
Real estate investments3


16
19
Private equity


1
1
Total$242
$638
$
$65
$945
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

 Fair Value Measurements Using 
 Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical Expedient 
As of December 31, 2016:(Level 1)(Level 2)(Level 3)(NAV)Total
 (in millions)
Assets:     
Domestic equity(*)
$142
$343
$
$
$485
International equity(*)

185


185
Fixed income:




U.S. Treasury, government, and agency bonds
85


85
Corporate bonds
41


41
Pooled funds
66


66
Cash equivalents and other12
5

83
100
Real estate investments4


15
19
Private equity


2
2
Total$158
$725
$
$100
$983
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
The composition of Southern Company Gas' pension plan assets as of December 31, 2017 and 2016, along with the targets, is presented below:
  Target 2017 2016
Pension plan assets:      
Equity 53% 65% 69%
Fixed Income 15
 19
 20
Cash 2
 6
 1
Other 30
 10
 10
Balance at end of period 100% 100% 100%
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

The fair values of Southern Company's (excluding Southern Company Gas) other postretirement benefit plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investment sales, and payables related to pending investment purchases.
 Fair Value Measurements Using   
 Quoted Prices in Active Markets for Identical Assets
Significant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTotalTarget AllocationActual Allocation
As of December 31, 2017:(Level 1)(Level 2)(Level 3)(NAV)
 (in millions)  
Assets:       
Domestic equity(*)
$132
$35
$
$
$167
37%40%
International equity(*)
47
76


123
23
23
Fixed income:     30
29
U.S. Treasury, government,
and agency bonds

32


32


Corporate bonds
37


37


Pooled funds
55


55


Cash equivalents and other10



10


Trust-owned life insurance
426


426


Real estate investments16


36
52
5
5
Special situations


5
5
1
1
Private equity


20
20
4
2
Total$205
$661
$
$61
$927
100%100%
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

 Fair Value Measurements Using   
 Quoted Prices in Active Markets for Identical Assets
Significant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical Expedient Target AllocationActual Allocation
As of December 31, 2016:(Level 1)(Level 2)(Level 3)(NAV)Total
 (in millions)  
Assets:       
Domestic equity(*)
$118
$28
$
$
$146
39%40%
International equity(*)
37
61


98
23
21
Fixed income:     29
31
U.S. Treasury, government, and agency bonds
24


24


Corporate bonds
30


30


Pooled funds
49


49


Cash equivalents and other41



41


Trust-owned life insurance
382


382


Real estate investments11


35
46
5
5
Special situations


5
5
1
1
Private equity


17
17
3
2
Total$207
$574
$
$57
$838
100%100%
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
The fair values of Southern Company Gas' other postretirement benefit plan assets for the period ended December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investment sales, and payables related to pending investment purchases. Special situations (absolute return and hedge funds) investment assets are presented in the tables below based on the nature of the investment.
 Fair Value Measurements Using 
 Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTotal
As of December 31, 2017:(Level 1)(Level 2)(Level 3)(NAV)
 (in millions)
Assets:     
Domestic equity(*)
$3
$69
$
$
$72
International equity(*)

22


22
Fixed income:    

Pooled funds
24


24
Cash equivalents and other2


1
3
Total$5
$115
$
$1
$121
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
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 Fair Value Measurements Using 
 Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTotal
As of December 31, 2016:(Level 1)(Level 2)(Level 3)(NAV)
 (in millions)
Assets:     
Domestic equity(*)
$3
$58
$
$
$61
International equity(*)

18


18
Fixed income:     
Pooled funds
23


23
Cash equivalents and other1


2
3
Total$4
$99
$
$2
$105
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
The composition of Southern Company Gas' other postretirement benefit plan assets as of December 31, 2017 and 2016, along with the targets, is presented below:
  Target 2017 2016
Other postretirement benefit plan assets:      
Equity 72% 76% 74%
Fixed Income 24
 20
 23
Cash 1
 2
 1
Other 3
 2
 2
Total 100% 100% 100%
Employee Savings Plan
Southern Company and its subsidiaries also sponsor 401(k) defined contribution plans covering substantially all employees and provide matching contributions up to specified percentages of an employee's eligible pay. Total matching contributions made to the plans for 2017, 2016, and 2015 were $118 million, $105 million, and $92 million, respectively.
3. CONTINGENCIES AND REGULATORY MATTERS
General Litigation Matters
On January 20, 2017, a purported securities class action complaint was filed against Southern Company, certain of its officers, and certain former Mississippi Power officers in the U.S. District Court for the Northern District of Georgia, Atlanta Division, by Monroe County Employees' Retirement System on behalf of all persons who purchased shares of Southern Company's common stock between April 25, 2012 and October 29, 2013. The complaint alleges that Southern Company, certain of its officers, and certain former Mississippi Power officers made materially false and misleading statements regarding the Kemper County energy facility in violation of certain provisions under the Securities Exchange Act of 1934, as amended. The complaint seeks, among other things, compensatory damages and litigation costs and attorneys' fees. On June 12, 2017, the plaintiffs filed an amended complaint that provided additional detail about their claims, increased the purported class period by one day, and added certain other former Mississippi Power officers as defendants. On July 27, 2017, the defendants filed a motion to dismiss the plaintiffs' amended complaint with prejudice, to which the plaintiffs filed an opposition on September 11, 2017.March 2024.
On February 27, 2017, Jean Vineyard filed a shareholder derivative lawsuit in the U.S. District Court for the Northern District of Georgia that names as defendants Southern Company, certain of its directors, certain of its officers, and certain former12, 2024, Mississippi Power officers.submitted its annual ECO Plan filing to the Mississippi PSC, which requested a $9 million annual increase in revenues. The complaint alleges that the defendants caused Southern Company to make false or misleading statements regarding the Kemper County energy facility cost and schedule. Further, the complaint alleges that the defendants were unjustly enriched and caused the waste of corporate assets. The plaintiff seeks to recover, on behalf of Southern Company, unspecified actual damages and, on her own behalf, attorneys' fees and costs in bringing the lawsuit. The plaintiff also seeks certain changes
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to Southern Company's corporate governance and internal processes. On March 27, 2017, the court deferred this lawsuit until 30 days after certain further action in the purported securities class action complaint discussed above.
On May 15, 2017, Helen E. Piper Survivor's Trust filed a shareholder derivative lawsuit in the Superior Court of Gwinnett County, State of Georgia and, on May 31, 2017, Judy Mesirov filed a shareholder derivative lawsuit in the U.S. District Court for the Northern District of Georgia. Each of these lawsuits names as defendants Southern Company, certain of its directors, certain of its officers, and certain former Mississippi Power officers. Each complaint alleges that the individual defendants, among other things, breached their fiduciary duties in connection with schedule delays and cost overruns associated with the construction of the Kemper County energy facility. Each complaint further alleges that the individual defendants authorized or failed to correct false and misleading statements regarding the Kemper County energy facility schedule and cost and failed to implement necessary internal controls to prevent harm to Southern Company. Each plaintiff seeks to recover, on behalf of Southern Company, unspecified actual damages and disgorgement of profits and, on its behalf, attorneys' fees and costs in bringing the lawsuit. Each plaintiff also seeks certain unspecified changes to Southern Company's corporate governance and internal processes. On August 15, 2017, these two shareholder derivative lawsuits were consolidated in the U.S. District Court for the Northern District of Georgia and the court deferred the consolidated case until 30 days after certain further action in the purported securities class action complaint discussed above.
Southern Company believes these legal challenges have no merit; however, an adverse outcome in any of these proceedings could have an impact on Southern Company's results of operations, financial condition, and liquidity. Southern Company will vigorously defend itself in these matters, the ultimate outcome of whichthis matter cannot be determined at this time.
Southern Company and its subsidiaries are subjectSee Note 2 to certain claims and legal actions arising in the ordinary course of business. In addition, the business activities of Southern Company's subsidiaries are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters. The ultimate outcome of such pending or potential litigation against Southern Company and its subsidiaries cannot be predicted at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on Southern Company's financial statements.
Environmental Matters
Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and the natural gas distribution utilities conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in the financial statements. A liabilitystatements under "Mississippi Power" for environmental remediation costs is recognized only when a loss is determined to be probable and reasonably estimable. The traditional electric operating companies and the natural gas distribution utilities in Illinois, New Jersey, Georgia, and Florida have all received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental compliance costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies.
Georgia Power's environmental remediation liability as of December 31, 2017 and 2016 was $22 million and $17 million, respectively. Georgia Power has been designated or identified as a potentially responsible party at sites governed by the Georgia Hazardous Site Response Act and/or by the federal Comprehensive Environmental Response, Compensation, and Liability Act, and assessment and potential cleanup of such sites is expected.
Gulf Power's environmental remediation liability includes estimated costs of environmental remediation projects of approximately $52 million and $44 million as of December 31, 2017 and 2016, respectively. These estimated costs primarily relate to site closure criteria by the Florida Department of Environmental Protection (FDEP) for potential impacts to soil and groundwater from herbicide applications at Gulf Power's substations. The schedule for completion of the remediation projects is subject to FDEP approval. The projects have been approved by the Florida PSC for recovery through Gulf Power's environmental cost recovery clause; therefore, these liabilities have no impact on net income.additional information.
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Southern Company and Subsidiary Companies 2017 Annual Report
Power

On September 20, 2023, Southern Company Gas' environmental remediation liability as of December 31, 2017 and 2016 was $388 million and $426 million, respectively, based on the estimated cost of environmental investigation and remediation associated with known current and former manufactured gas plant operating sites. These environmental remediation expenditures are recoverable from customers through rate mechanisms approved by the applicable state regulatory agenciesPower acquired 100% of the natural gas distribution utilities, withmembership interests in the exception of one site representing $2 million of the total accrued remediation costs.
200-MW Millers Branch solar project located in Haskell County, Texas from EDF Renewables Development, Inc. and is continuing construction. The ultimate outcome of these matters cannot be determined at this time; however, asfacility's output is contracted under a result of the regulatory treatment for environmental remediation expenses described above, the final disposition of these matters20-year PPA and commercial operation is not expected to have a material impact on Southern Company's financial statements.
Nuclear Fuel Disposal Costs
Acting throughoccur in the DOE and pursuantfourth quarter 2025. The project includes an option to the Nuclear Waste Policy Act of 1982, the U.S. government entered into contracts with Alabama Power and Georgia Power that require the DOEexpand capacity up to dispose of spent nuclear fuel and high level radioactive waste generated at Plants Hatch and Farley and Plant Vogtle Units 1 and 2 beginning no later than January 31, 1998. The DOE has yet to commence the performance of its contractual and statutory obligation to dispose of spent nuclear fuel. Consequently, Alabama Power and Georgia Power pursued and continue to pursue legal remedies against the U.S. government for its partial breach of contract.
In 2014, the Court of Federal Claims entered a judgment in favor of Georgia Power and Alabama Power in their spent nuclear fuel lawsuit seeking damages for the period from January 1, 2005 through December 31, 2010. In 2015, Georgia Power recovered approximately $18 million, based on its ownership interests, which was credited to accounts where the original costs were charged, and used to reduce rate base, fuel, and cost of service for the benefit of customers. Also in 2015, Alabama Power recovered approximately $26 million, which was applied to reduce the cost of service for the benefit of customers.
In 2014, Alabama Power and Georgia Power filed lawsuits against the U.S. government for the costs of continuing to store spent nuclear fuel at Plants Farley and Hatch and Plant Vogtle Units 1 and 2 for the period from January 1, 2011 through December 31, 2013. The damage period was subsequently extendedan additional 300 MWs. Subsequent to December 31, 2014. On October 10, 2017, Alabama2023, Southern Power and Georgia Power filed additional lawsuits againstcommitted to expand the U.S. governmentconstruction of the facility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the Courtsecond quarter 2026.
On September 22, 2023, Southern Power acquired 100% of Federal Claims for the costs of continuing to store spent nuclear fuel at Plants Farley and Hatch and Plant Vogtle Units 1 and 2 for the period from January 1, 2015 through December 31, 2017. Damages will continue to accumulate until the issue is resolved or storage is provided. No amounts have been recognizedmembership interests in the financial statements as of December 31, 2017 for any potential recoveries150-MW South Cheyenne solar project located in Laramie County, Wyoming from Hanwha Q Cells USA Corp. and is continuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to occur in the pending lawsuits. The final outcome of these matters cannot be determined at this time. However, Alabama Power and Georgia Power expect to credit any recoveries back for the benefit of customers in accordance with direction from their respective PSC and, therefore, no material impact on Southern Company's net income is expected.
On-site dry spent fuel storage facilities are operational at all three plants and can be expanded to accommodate spent fuel through the expected life of each plant.
FERC Matters
Market-Based Rate Authority
The traditional electric operating companies and Southern Power have authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies and Southern Power to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies and Southern Power filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for the traditional electric operating companies' and Southern Power's potential to exert market power in certain areas served by the traditional
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electric operating companies and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.
On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.second quarter 2024.
The ultimate outcome of these matters cannot be determined at this time.
Regulatory Matters
AlabamaSouthern Power
Rate RSE
The Alabama PSC has adopted Rate RSE that provides calculates an investment coverage ratio for periodic annual adjustments based upon Alabama Power's projected weighted cost of equity (WCE) compared to an allowable range. Rate RSE adjustments areits generating assets, including those owned with various partners, based on forward-looking informationthe ratio of investment under contract to total investment using the respective facilities' net book value (or expected in-service value for facilities under construction) as the applicable upcoming calendar year. Retail rates remain unchanged wheninvestment amount. With the WCE ranges between 5.75%inclusion of investments associated with facilities under construction, as well as other capacity and 6.21%energy contracts, Southern Power's average investment coverage ratio at December 31, 2023 was 97% through 2028 and 89% through 2033, with an adjusting pointaverage remaining contract duration of 5.98% and eligibility for a performance-based adder of seven basis points, or 0.07%,approximately 12 years.
See Note 15 to the WCE adjusting point if Alabama Power (i) has an "A" credit rating equivalent with at least onefinancial statements under "Southern Power" for additional information.
Southern Company Gas
On June 15, 2023, the Illinois Commission concluded its review of the recognized rating agencies or (ii) isQualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the top one-thirdsecond quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an $8 million reduction to revenues and $30 million in estimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a designated customer value benchmark survey. Rate RSE adjustmentsrehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for any two-year period, when averaged together, cannot exceed 4.0%Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and any annual adjustment is limitedan equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to 5.0%. If Alabama Power's actual retail return is abovebe completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the allowed WCE range,Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the excessfourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be refundedpostponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined in the Illinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to customers unless otherwise directedthe Illinois Commission's rate case ruling.
Any further cost disallowances by the Alabama PSC; however, there is no provisionIllinois Commission in the pending cases could be material to the financial statements of Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional customer billings shouldinformation.
On December 19, 2023, the actual retail return fall below the WCE range.
At December 31, 2016, Alabama Power's retail return exceeded the allowed WCE rangeGeorgia PSC approved Atlanta Gas Light's annual GRAM filing, which resulted in Alabama Power establishingan annual base rate increase of $53 million effective January 1, 2024.
On February 1, 2024, Atlanta Gas Light filed its triennial Integrated Capacity and Delivery Plan (i-CDP) with the Georgia PSC, which included a $73 million Rate RSE refund liability. In accordance with an Alabamaseries of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2025 through 2034), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected
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capital investments totaling approximately $0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order issued on February 14, 2017, Alabama Power applied the full amount of the refund to reduce the under recovered balance of Rate CNP PPA as discussed further below.
Effective in January 2017, Rate RSE increased 4.48%, or $245 million annually. At December 31, 2017, Alabama Power's actual retail return was within the allowed WCE range. On December 1, 2017, Alabama Power made its required annual Rate RSE submission to the Alabama PSC of projected data for calendar year 2018. Projected earnings were within the specified range; therefore, retail rates under Rate RSE remained unchanged for 2018.
In conjunction with Rate RSE, Alabama Power has an established retail tariff that provides for an adjustment to customer billings to recognize the impact of a changethis matter in the statutory income tax rate. As a result of Tax Reform Legislation, the application of this tariff would reduce annual retail revenue by approximately $250 million over the remainder of 2018.third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Rate CNP PPA
Alabama Power's retail rates,On August 28, 2023, the Virginia Commission approved by the Alabama PSC, providea stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for adjustments under Rate CNP to recognize the placing of new generating facilities into retail service. Alabama Power may also recover retail costs associated with certificated PPAs under Rate CNP PPA. On March 7, 2017, the Alabama PSC issued a consent order that Alabama Power leave$48 million increase in effect the current Rate CNP PPA factor for billings for the period April 1, 2017 through March 31, 2018. No adjustment to Rate CNP PPA is expected in 2018. As of December 31, 2017 and 2016, Alabama Power had an under recovered Rate CNP PPA balance of $12 million and $142 million, respectively, which is included in deferred under recovered regulatory clauseannual base rate revenues in the balance sheet.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, Alabama Power eliminated the under recovered balance in Rate CNP PPA at December 31, 2016, which totaled approximately $142 million. As discussed herein under "Rate RSE," Alabama Power utilized the full amount of its $73 million Rate RSE refund liability to reduce the amount of the Rate CNP PPA under recovery and reclassified the remaining $69 million to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of Alabama Power's next depreciation study, which is expected to occur within the next two to four years. Alabama Power's current depreciation study became effective January 1, 2017.
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Rate CNP Compliance
Rate CNP Compliance allows for the recovery of Alabama Power's retail costs associated with laws, regulations, and other such mandates directed at the utility industry involving the environment, security, reliability, safety, sustainability, or similar considerations impacting Alabama Power's facilities or operations. Rate CNP Compliance is based on forward-looking informationa ROE of 9.70% and provides for the recoveryan equity ratio of these costs pursuant to a factor that is calculated annually. Compliance costs to be recovered include operations and maintenance expenses, depreciation, and a return on certain invested capital. Revenues for Rate CNP Compliance, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor will have no significant effect on revenues or net income, but will affect annual cash flow. Changes in Rate CNP Compliance-related operations and maintenance expenses and depreciation generally will have no effect on net income.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, Alabama Power reclassified $36 million of its under recovered balance in Rate CNP Compliance to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of Alabama Power's next depreciation study, which is expected to occur within the next two to four years. Alabama Power's current depreciation study49.06%. Interim rates became effective January 1, 2017.
On December 5, 2017, the Alabama PSC issued a consent order that Alabama Power leave in effect for 2018 the factors associated with Alabama Power's compliance costs for the year 2017, with any under-collected amount for prior years deemed recovered before any current year amounts. Any under recovered amounts associated with 2018 will be reflected in the 2019 filing. As of December 31, 2017 and 2016, Alabama Power had a deferred under recovered regulatory clause revenues balance of $17 million and $9 million, respectively.
Rate ECR
Alabama Power has established energy cost recovery rates under Alabama Power's Rate ECR as approved by the Alabama PSC. Rates are based on an estimate of future energy costs and the current over or under recovered balance. Revenues recognized under Rate ECR and recorded on the financial statements are adjusted for the difference in actual recoverable fuel costs and amounts billed in current regulated rates. The difference in the recoverable fuel costs and amounts billed give rise to the over or under recovered amounts recorded as regulatory assets or liabilities. Alabama Power, along with the Alabama PSC, continually monitors the over or under recovered cost balance to determine whether an adjustment to billing rates is required. Changes in the Rate ECR factor have no significant effect on Southern Company's net income, but will impact operating cash flows. Currently, the Alabama PSC may approve billing rates under Rate ECR of up to 5.910 cents per KWH.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, Alabama Power reclassified $36 million of its under recovered balance in Rate ECR to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of Alabama Power's next depreciation study, which is expected to occur within the next two to four years. Alabama Power's current depreciation study became effective January 1, 2017.
On December 5, 2017, the Alabama PSC issued a consent order that Alabama Power leave in effect for 2018 the energy cost recovery rates which began in 2017. Therefore, the Rate ECR factor as of January 1, 2018 remained at 2.015 cents per KWH. The rate will return2023, subject to 5.910 cents per KWH in 2019, absent a further order from the Alabama PSC.
At December 31, 2017, Alabama Power's under recovered fuel costs totaled $25 million, which is included in other regulatory assets, current. At December 31, 2016, Alabama Power had an over recovered fuel balance of $76 million, which was included in other regulatory liabilities, current. These classifications arerefund, based on estimates, which include such factors as weather, generation availability, energy demand, and the priceVirginia Natural Gas' original requested increase of energy. A change in any of these factors could have a material impact on the timing of any recovery or return of fuel costs.
Rate NDR
Based on an order from the Alabama PSC, Alabama Power maintains a reserve for operations and maintenance expensesapproximately $69 million. Refunds to cover the cost of damages from major storms to its transmission and distribution facilities. The order approves a separate monthly Rate NDR charge to customers consisting of two components. The first component is intended to establish and maintain a reserve balance for future storms and is an on-going part of customer billing. When the reserve balance falls below $50 million, a reserve establishment charge will be activated (and the on-going reserve maintenance charge concurrently suspended) until the reserve balance reaches $75 million. The second component of the Rate NDR charge is intended to allow recovery of any existing deferred storm-related operations and maintenance costs and any future reserve deficits over a 24-month period. The Alabama PSC order gives Alabama Power authority to record a deficit balance in the NDR when costs of storm damage exceed any established reserve balance. Absent further Alabama PSC approval, the maximum total Rate NDR charge consisting of both
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components is $10 per month per non-residential customer account and $5 per month per residential customer account. Alabama Power has the authority, based on an order from the Alabama PSC, to accrue certain additional amounts as circumstances warrant. The order allows for reliability-related expenditures to be charged against the additional accruals when the NDR balance exceeds $75 million. Alabama Power may designate a portion of the NDR to reliability-related expenditures as a part of an annual budget process for the following year or during the current year for identified unbudgeted reliability-related expenditures that are incurred. Accruals that have not been designated can be used to offset storm charges. Additional accruals to the NDR will enhance Alabama Power's ability to deal with the financial effects of future natural disasters, promote system reliability, and offset costs retail customers would otherwise bear. No such accruals were recorded or designated in any period presented.
In December 2017, the reserve maintenance charge was suspended and the reserve establishment charge was activated as a result of the NDR balance falling below $50 million. Alabama Power expects to collect approximately $16 million annually until the reserve balance is restored to $75 million. The NDR balance at December 31, 2017 was $38 million.
As revenue from the Rate NDR charge is recognized, an equal amount of operations and maintenance expenses related to the NDR will also be recognized. As a result,difference between the Rate NDR charge will not have an effect on net income but will impact operating cash flows.
Environmental Accounting Order
Based on an order from the Alabama PSC, Alabama Power is allowed to establish a regulatory asset to record the unrecovered investment costs, including the unrecovered plant asset balanceapproved rates effective September 1, 2023 and the unrecovered costs associatedinterim rates were completed during the fourth quarter 2023.
On February 9, 2024, Virginia Natural Gas filed with site removal and closure associatedthe Virginia Commission a request to extend the existing SAVE program through 2029. The request includes investments of $70 million in each year from 2025 through 2029, with future unit retirements caused by environmental regulations. The regulatory asset will be amortized and recovereda potential variance of up to $5 million allowed for the program, for a maximum total investment over the affected unit's remaining useful life, as established priorfive-year extension (2025 through 2029) of $355 million. Virginia Natural Gas expects the Virginia Commission to the decision regarding early retirement through Rate CNP Compliance.
Alabama Power retired Plant Gorgas Units 6 and 7 (200 MWs) and Plant Barry Unit 3 (225 MWs) in 2015. Additionally, Alabama Power ceased using coal at Plant Barry Units 1 and 2 (250 MWs) in 2015, but such units remain availableissue a final order on a limited basis with natural gas as the fuel source. In April 2016, Alabama Power also ceased using coal at Plant Greene County Units 1 and 2 (300 MWs representing Alabama Power's ownership interest) and began operating Units 1 and 2 solely on natural gas in June 2016 and July 2016, respectively.
In accordance with this accounting order from the Alabama PSC, Alabama Power transferred the unrecovered plant asset balances to regulatory assets at their respective retirement dates. These regulatory assets are being amortized and recovered through Rate CNP Compliance over the units' remaining useful lives, as established prior to the decision for retirement; therefore, these decisions associated with coal operations had no significant impact on Southern Company's financial statements.
Georgia Power
Rate Plans
Pursuant to the terms and conditions of a settlement agreement related to Southern Company's acquisition of Southern Company Gas approved by the Georgia PSC in April 2016, the 2013 ARP will continue in effect until December 31, 2019, and Georgia Power will be required to file its next base rate case by July 1, 2019. Furthermore, through December 31, 2019, Georgia Power and Atlanta Gas Light Company each will retain their respective merger savings, net of transition costs, as definedmatter in the settlement agreement; through December 31, 2022, such net merger savings applicable to each will be shared on a 60/40 basis with their respective customers; thereafter, all merger savings will be retained by customers.
In accordance with the 2013 ARP, the Georgia PSC approved increases to tariffs effective January 1, 2016 as follows: (1) traditional base tariff rates by approximately $49 million; (2) Environmental Compliance Cost Recovery tariff by approximately $75 million; (3) Demand-Side Management tariffs by approximately $3 million; and (4) Municipal Franchise Fee tariff by approximately $13 million, for a total increase in base revenues of approximately $140 million. There were no changes to these tariffs in 2017.
Under the 2013 ARP, Georgia Power's retail ROE is set at 10.95% and earnings are evaluated against a retail ROE range of 10.00% to 12.00%. Two-thirds of any earnings above 12.00% will be directly refunded to customers, with the remaining one-third retained by Georgia Power. There will be no recovery of any earnings shortfall below 10.00% on an actual basis. In 2015, Georgia Power's retail ROE was within the allowed retail ROE range. In 2016, Georgia Power's retail ROE exceeded 12.00%, and Georgia Power will refund to retail customers approximately $44 million in 2018, as approved by the Georgia PSC on January 16, 2018. In 2017, Georgia Power's retail ROE was within the allowed retail ROE range, subject to review and approval by the Georgia PSC.
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On January 19, 2018, the Georgia PSC issued an order on the Tax Reform Legislation, which was amended on February 16, 2018 (Tax Order). In accordance with the Tax Order, Georgia Power is required to submit its analysis of the Tax Reform Legislation and related recommendations to address the related impacts on Georgia Power's cost of service and annual revenue requirements by March 6, 2018.second quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Integrated Resource Plan
Key Performance Indicators
In July 2016,striving to achieve attractive risk-adjusted returns while providing cost-effective energy to approximately 8.9 million electric and gas utility customers collectively, the Georgia PSC approvedtraditional electric operating companies and Southern Company Gas continue to focus on several key performance indicators. These indicators include, but are not limited to, customer satisfaction, plant availability, electric and natural gas system reliability, and execution of major construction projects. In addition, Southern Company and the Subsidiary Registrants focus on earnings per share (EPS) and net income, respectively, as a key performance indicator. See RESULTS OF OPERATIONS herein for information on the Registrants' financial performance.
The financial success of the traditional electric operating companies and Southern Company Gas is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. The traditional electric operating companies use customer satisfaction surveys to evaluate their results and generally target the top quartile of these surveys in measuring performance. Reliability indicators are also used to evaluate results. See Note 2 to the financial statements under "Alabama Power – Rate RSE" and "Mississippi Power – Performance Evaluation Plan" for additional information on Alabama Power's Rate RSE and Mississippi Power's PEP rate plan, respectively, both of which contain mechanisms that directly tie customer service indicators to the allowed equity return.
Southern Company Gas also continues to focus on several operating metrics, including Heating Degree Days, customer count, and volumes of natural gas sold. Southern Company Gas measures weather and the effect on its business using Heating Degree Days. Generally, increased Heating Degree Days result in higher demand for natural gas on Southern Company Gas' distribution system. See RESULTS OF OPERATIONS – "Southern Company Gas" for additional information on Southern Company Gas' operating metrics.
Southern Power continues to focus on several key performance indicators, including, but not limited to, the equivalent forced outage rate and contract availability to evaluate operating results and help ensure its ability to meet its contractual commitments to customers.
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RESULTS OF OPERATIONS
Southern Company
Consolidated net income attributable to Southern Company was $4.0 billion in 2023, an increase of $452 million, or 12.8%, from 2022. The increase was primarily due to lower non-fuel operations and maintenance costs, an increase in retail electric revenues associated with rates and pricing, a decrease in income tax expense, a decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, an increase in other revenues, an increase in natural gas revenues from rate increases and continued infrastructure replacement, and a goodwill impairment charge in 2022 at PowerSecure, partially offset by higher depreciation and amortization, higher interest expense, and a decrease in retail electric revenues associated with milder weather in 2023 compared to 2022. See Notes 1 and 2 to the financial statements under "Goodwill and Other Intangible Assets" and "Georgia Power – Nuclear Construction," respectively, for additional information.
Basic EPS was $3.64 in 2023 and $3.28 in 2022. Diluted EPS, which factors in additional shares related to stock-based compensation, was $3.62 in 2023 and $3.26 in 2022. EPS for 2023 and 2022 was negatively impacted by $0.06 and $0.04 per share, respectively, as a result of increases in the average shares outstanding. See Note 8 to the financial statements under "Outstanding Classes of Capital Stock – Southern Company" for additional information.
Dividends paid per share of common stock were $2.78 in 2023 and $2.70 in 2022. In January 2024, Southern Company declared a quarterly dividend of 70 cents per share. For 2023, the dividend payout ratio was 76% compared to 82% for 2022.
Discussion of Southern Company's results of operations is divided into three parts – the Southern Company system's primary business of electricity sales, its gas business, and its other business activities.
20232022
(in millions)
Electricity business$3,994 $3,672 
Gas business615 572 
Other business activities(633)(720)
Net Income$3,976 $3,524 
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Electricity Business
Southern Company's electric utilities generate and sell electricity to retail and wholesale customers. A condensed statement of income for the electricity business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Electric operating revenues$19,998 $(2,875)
Fuel4,365 (2,470)
Purchased power883 (710)
Cost of other sales171 57 
Other operations and maintenance4,679 (550)
Depreciation and amortization3,865 836 
Taxes other than income taxes1,159 34 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total electric operating expenses15,054 (3,054)
Operating income4,944 179 
Allowance for equity funds used during construction247 37 
Interest expense, net of amounts capitalized1,274 207 
Other income (expense), net533 17 
Income taxes583 (265)
Net income3,867 291 
Less:
Dividends on preferred stock of subsidiaries (11)
Net loss attributable to noncontrolling interests(127)(20)
Net Income Attributable to Southern Company$3,994 $322 
Electric Operating Revenues
Electric operating revenues for 2023 were $20.0 billion, reflecting a $2.9 billion, or 12.6%, decrease from 2022. Details of electric operating revenues were as follows:
 20232022
 (in millions)
Retail electric — prior year$18,197 
Estimated change resulting from —
Rates and pricing437 
Sales decline(33)
Weather(229)
Fuel and other cost recovery(2,029)
Retail electric — current year$16,343 $18,197 
Wholesale electric revenues2,467 3,641 
Other electric revenues792 747 
Other revenues396 288 
Electric operating revenues$19,998 $22,873 
Retail electric revenues decreased $1.9 billion, or 10.2%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing in 2023 was primarily due to base tariff increases in accordance with Georgia Power's triennial Integrated Resource Plan (2016 IRP)2022 ARP, revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed
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retail ROE range, an increase in Rate CNP Compliance revenues at Alabama Power, and a lower Rate RSE customer refund accrual in 2023 compared to 2022 at Alabama Power, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in the revenues recognized under the NCCR tariff, both at Georgia Power.
Electric rates for the traditional electric operating companies include provisions to adjust billings for fluctuations in fuel costs, including the decertificationenergy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of PPA costs, and retirementdo not affect net income. The traditional electric operating companies each have one or more regulatory mechanisms to recover other costs such as environmental and other compliance costs, storm damage, new plants, and PPA capacity costs.
See Note 2 to the financial statements under "Alabama Power" and "Georgia Power" for additional information. Also see "Energy Sales" herein for a discussion of Plant Mitchell Units 3, 4A,changes in the volume of energy sold, including estimated changes related to sales and 4B (217 MWs)weather.
Wholesale electric revenues from power sales were as follows:
20232022
 (in millions)
Capacity and other$630 $625 
Energy1,837 3,016
Total$2,467 $3,641 
In 2023, wholesale electric revenues decreased $1.2 billion, or 32.2%, as compared to 2022 primarily due to a decrease in energy revenues. Energy revenues decreased $884 million at Southern Power and Plant Kraft Unit 1 (17 MWs),$295 million at the traditional electric operating companies primarily due to fuel and purchased power price decreases compared to 2022. Also contributing to the Southern Power decrease was a net decrease in the volume of KWHs sold primarily associated with natural gas PPAs.
Wholesale electric revenues consist of revenues from PPAs and short-term opportunity sales. Wholesale electric revenues from PPAs (other than solar and wind PPAs) have both capacity and energy components. Capacity revenues generally represent the greatest contribution to net income and are designed to provide recovery of fixed costs plus a return on investment. Energy revenues will vary depending on fuel prices, the market prices of wholesale energy compared to the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Energy sales from solar and wind PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or through a fixed price related to the energy. As a result, the ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Wholesale electric revenues at Mississippi Power include FERC-regulated MRA sales under cost-based tariffs as well as market-based sales. Short-term opportunity sales are made at market-based rates that generally provide a margin above the decertificationSouthern Company system's variable cost to produce the energy.
Other Electric Revenues
Other electric revenues increased $45 million, or 6.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $23 million in outdoor lighting sales at Georgia Power, $18 million resulting from receipts of liquidated damages associated with generation facility production guarantees and an arbitration award at Southern Power, $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs at Georgia Power, and $17 million in retail solar program fees at Georgia Power, partially offset by decreases of $25 million in cogeneration steam revenues associated with lower natural gas prices at Alabama Power and $14 million in rent revenues primarily at Alabama Power.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential47.1 (5.1)%(0.5)%
Commercial48.3 0.1 1.3 
Industrial48.6 (1.9)(1.9)
Other0.5 (7.2)(6.8)
Total retail144.5 (2.3)(0.4)%
Wholesale51.0 (9.4)
Total energy sales195.5 (4.3)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the Intercession Cityhistorical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in the applicable service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Weather-adjusted retail energy sales decreased 587 million KWHs in 2023 as compared to 2022. Weather-adjusted residential KWH sales decreased 0.5% primarily due to decreased customer usage, partially offset by customer growth. Weather-adjusted commercial KWH sales increased 1.3% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 1.9% primarily due to decreases in the chemicals, forest products, and textiles sectors.
See "Electric Operating Revenues" above for a discussion of significant changes in wholesale revenues related to changes in price and KWH sales.
Other Revenues
Other revenues increased $108 million, or 37.5%, in 2023 as compared to 2022. The increase was primarily due to increases of $54 million in power delivery construction and maintenance projects at Georgia Power, $34 million in unregulated sales of products and services at Alabama Power, and $25 million associated with energy conservation projects at Georgia Power.
Fuel and Purchased Power Expenses
The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit (143 MWscost of fuel consumed, and the availability of generating units. Additionally, the electric utilities purchase a portion of their electricity needs from the wholesale market.
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Details of the Southern Company system's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)(b)
184 186 
Total purchased power (in billions of KWHs)
18 25 
Sources of generation (percent)(a) —
Gas54 51 
Nuclear(b)
18 16 
Coal17 22 
Hydro3 
Wind, Solar, and Other8 
Cost of fuel, generated (in cents per net KWH) 
Gas(a)
2.77 5.29 
Nuclear(b)
0.76 0.72 
Coal4.33 3.67 
Average cost of fuel, generated (in cents per net KWH)(a)(b)
2.68 4.05 
Average cost of purchased power (in cents per net KWH)(c)
5.17 7.66 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(c)Average cost of purchased power includes fuel purchased by the Southern Company system for tolling agreements where power is generated by the provider.
In 2023, total capacity). fuel and purchased power expenses were $5.2 billion, a decrease of $3.2 billion, or 37.7%, as compared to 2022. The decrease was primarily the result of a $2.7 billion decrease in the average cost of fuel generated and purchased and a $513 million net decrease in the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions at the traditional electric operating companies are generally offset by fuel revenues and do not have a significant impact on net income. See Note 2 to the financial statements for additional information. Fuel expenses incurred under Southern Power's PPAs are generally the responsibility of the counterparties and do not significantly impact net income.
Fuel
In August 2016,2023, fuel expense was $4.4 billion, a decrease of $2.5 billion, or 36.1%, as compared to 2022. The decrease was primarily due to a 47.6% decrease in the Plant Mitchellaverage cost of natural gas per KWH generated and Plant Kraft unitsa 22.5% decrease in the volume of KWHs generated by coal, partially offset by an 18.2% decrease in the volume of KWHs generated by hydro, an 18.0% increase in the average cost of coal per KWH generated, a 10.8% increase in the volume of KWHs generated by nuclear, and a 6.9% increase in the volume of KWHs generated by natural gas.
Purchased Power
In 2023, purchased power expense was $883 million, a decrease of $710 million, or 44.6%, as compared to 2022. The decrease was primarily due to a 32.5% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 27.5% decrease in the volume of KWHs purchased.
Energy purchases will vary depending on demand for energy within the Southern Company system's electric service territory, the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, and the availability of the Southern Company system's generation.
Cost of Other Sales
Cost of other sales increased $57 million, or 50.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $40 million from unregulated power delivery construction and maintenance projects at Georgia Power and $20 million in expenses related to unregulated products and services at Alabama Power.
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Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $550 million, or 10.5%, in 2023 as compared to 2022. The decrease reflects a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred at Alabama Power. Excluding this decrease, there were retireddecreases of $223 million in transmission and distribution expenses primarily related to line maintenance, $182 million in storm damage recovery as authorized in Georgia Power's 2022 ARP, $91 million in generation non-outage maintenance expenses and planned outages, and $50 million in employee compensation and benefit expenses, partially offset by an $86 million increase in technology infrastructure and application production costs and a $73 million increase in generation environmental projects primarily at Georgia Power. See Note 1 to the financial statements under "Storm Damage and Reliability Reserves" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $836 million, or 27.6%, in 2023 as compared to 2022. The increase was primarily due to increases of $541 million and $190 million resulting from higher depreciation rates at Alabama Power and Georgia Power, sold its 33% ownership interestrespectively, and $79 million from additional plant in service. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $34 million, or 3.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $62 million in property taxes primarily at Georgia Power resulting from an increase in the Intercession City unitassessed value of property and $14 million in utility license taxes at Alabama Power, partially offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues at Georgia Power.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to Duke Energy Florida, LLC.
Additionally,income for the Georgia PSC approvedestimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect Georgia Power's environmental compliance strategyrevisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $37 million, or 17.6%, in 2023 as compared to 2022. The increase was primarily associated with an increase in capital expenditures proposedsubject to AFUDC at Georgia Power and an increase in capital expenditures related to hydro production and Plant Barry Unit 8 construction at Alabama Power. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $207 million, or 19.4%, in 2023 as compared to 2022. The increase reflects approximately $120 million related to higher interest rates and $96 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $17 million, or 3.3%, in 2023 as compared to 2022 primarily due to a $48 million decrease in charitable donations primarily at Georgia Power, a $15 million increase in interest income, and a $14 million decrease in non-operating benefit-related expenses at Alabama Power, partially offset by a $42 million decrease in non-service cost-related retirement benefits income and a $13 million decrease in customer charges related to contributions in aid of construction at Georgia Power. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $265 million, or 31.3%, in 2023 as compared to 2022. The decrease was primarily due to a $252 million increase in the 2016 IRP,flowback of certain excess deferred income taxes at Alabama Power, an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards at Georgia Power, generation of $35 million of advanced nuclear PTCs at Georgia Power, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward at Georgia Power, partially offset by a $145 million decrease in the flowback of certain excess deferred income taxes at Georgia Power that ended in 2022. See Note 10 to the financial statements for additional information.
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Net Loss Attributable to Noncontrolling Interests
Substantially all noncontrolling interests relate to renewable projects at Southern Power. Net loss attributable to noncontrolling interests increased $20 million, or 18.7%, in 2023 as compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to Southern Power's wind tax equity partners and $5 million in lower income allocations to Southern Power's equity partners, partially offset by $10 million in lower HLBV loss allocations to Southern Power's battery energy storage partners.
Gas Business
Southern Company Gas distributes natural gas through utilities in four states and is involved in several other complementary businesses including measures takengas pipeline investments and gas marketing services.
A condensed statement of income for the gas business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Income taxes211 31 
Net income$615 $43 
During the period from November through March when natural gas usage and operating revenues are generally higher (Heating Season), more customers are connected to comply with existing government-imposed environmental mandates, subjectSouthern Company Gas' distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively equally over any given year. Thus, operating results can vary significantly from quarter to limits on expendituresquarter as a result of seasonality. For 2023, the percentage of operating revenues and net income generated during
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the Heating Season (January through March and November through December) were 67% and 73%, respectively. For 2022, the percentage of operating revenues and net income generated during the Heating Season were 67% and 66%, respectively.
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for Plant McIntosh Unit 1 and Plant Hammond Units 1 through 4.additional information.
The Georgia PSC approved the reclassification of the remaining net book value of Plant Mitchell Unit 3 and costsRevenues associated with materialsgas costs and supplies remaining atother cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the unit retirement date to a regulatory asset. Recoverytiming of the unit's net book value will continue through December 31, 2019, as provided in the 2013 ARP. The timing ofnatural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the remaining balanceamount expensed in cost of natural gas and do not affect net income from the unit's net book value asnatural gas distribution utilities. See "Cost of December 31, 2019 and costs associated with materials and supplies remaining at the unit retirement date was deferredNatural Gas" herein for considerationadditional information.
Revenues from gas marketing services decreased in Georgia Power's 2019 base rate case.
The Georgia PSC also approved the Renewable Energy Development Initiative (REDI) to procure an additional 1,200 MWs of renewable resources2023 primarily utilizing market-based prices established through a competitive bidding process with expected in-service dates between 2018 and 2021. Additionally, 200 MWs of self-build capacity for use by Georgia Power was approved, as well as consideration for no more than 200 MWs of capacity as part of a renewable commercial and industrial program.
In 2017, Georgia Power filed for and received certification for 510 MWs of REDI utility-scale PPAs for solar generation resources, which are expected to be in operation by the end of 2019. Georgia Power also filed for and received approval to develop several solar generation projects to fulfill the approved self-build capacity.
In the 2016 IRP, the Georgia PSC also approved recovery of costs up to $99 million through June 30, 2019 to preserve nuclear generation as an option at a future generation site in Stewart County, Georgia. On March 7, 2017, the Georgia PSC approved Georgia Power's decision to suspend work at the site due to changing economics, including lower load forecastsnatural gas prices and fuel costs. Thethe timing of recoveryunrealized hedge losses.
Southern Company Gas hedged its exposure to warmer-than-normal weather in Illinois for costs incurredgas distribution operations and in Illinois and Georgia for gas marketing services. The remaining impacts of approximately $50 million is expected to be determined by the Georgia PSC in a future Georgia Power rate case.weather on earnings were immaterial.
Fuel Cost Recovery
Georgia Power has established fuel cost recovery rates approved by the Georgia PSC. In 2015,On May 16, 2023, the Georgia PSC approved a stipulation agreement between Georgia Power's request to lower annual billings by approximately $350 million effective January 1, 2016. In May 2016,Power and the staff of the Georgia PSC approved Georgia Power's request to further lowerincrease annual fuel billings under an interim fuel rider by 54%, or approximately $313 million$1.1 billion, effective June 1, 2016, which expired on December 31, 2017.2023. The Georgia PSC will review Georgia Power's cumulative over or under recovered fuel balance no later than September 1, 2018 and evaluate the need to fileincrease reflects a fuel case unless Georgia Power deems it necessary to file a fuel case at an earlier time. Georgia Power continues to be allowed to adjust its fuel costthree-year recovery rates under an interim fuel rider prior to the next fuel case if the under recovered fuel balance exceeds $200 million.
Georgia Power's fuel cost recovery mechanism includes costs associated with a natural gas hedging program, as revised and approved by the Georgia PSC, allowing the useperiod for $2.2 billion of an array of derivative instruments within a 48-month time horizon.
Georgia Power's under recovered fuel balance totaled $165 million at DecemberMay 31, 2017 and is included2023. Changes in current assets. At December 31, 2016, Georgia Power's over recovered fuel balance totaled $84 million and is included in other regulatory liabilities, current.
Fuel cost recovery revenues as recorded on the financial statements are adjusted for differences in actual recoverable fuel costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor will notrates have ano significant effect on Southern Company's revenues or Georgia Power's net income but will affectdo impact the related operating cash flow.flows. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Storm Damage RecoveryIntegrated Resource Plans
On October 27, 2023, Georgia Power is accruing $30 million annually through December 31, 2019, as providedfiled an updated IRP (2023 IRP Update) with the Georgia PSC, which sets forth a plan to support the recent increase in the 2013 ARP, for incremental operating and maintenance costsstate of damage from major stormsGeorgia's projected energy needs since the 2022 IRP. Georgia Power expects the Georgia PSC to its transmission and distribution facilities. Hurricanes Irma and Matthew caused significant damage to Georgia Power's transmission and distribution facilities during September 2017 and
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Southern Company and Subsidiary Companies 2017 Annual Report

October 2016, respectively.render a final decision on the 2023 IRP Update on April 16, 2024. The incremental restoration costs related to these hurricanes deferred in Georgia Power's regulatory asset for storm damage totaled approximately $260 million. The rate of storm damage cost recovery is expected to be adjusted as part of Georgia Power's next base rate case required to be filed by July 1, 2019. As a resultultimate outcome of this regulatory treatment, costs relatedmatter cannot be determined at this time. See Note 2 to storms are not expected to have a material impact on Southern Company'sthe financial statements.statements under "Georgia Power – Integrated Resource Plans" for additional information.
At December 31, 2017 and December 31, 2016, the total balance in Georgia Power's regulatory asset related to storm damage was $333 million and $206 million, respectively, with approximately $30 million included in other regulatory assets, current for both years and approximately $303 million and $176 million included in other regulatory assets, deferred, respectively.
GulfMississippi Power
Retail Base Rate Cases
In 2013,On October 27, 2023, the Florida PSCFERC approved a settlement agreement filed by Mississippi Power and Cooperative Energy on July 31, 2023 related to GulfMississippi Power's 2013 retailJuly 2022 request for a $23 million increase in annual wholesale base rate case that authorized Gulf Powerrevenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and a refund to reduce depreciation and record a regulatory asset up to $62.5customers of approximately $6 million from January 2014 through June 2017. In any given month, such depreciation reduction was not to exceed the amount necessary for the retail ROE, as reportedprimarily related to the Florida PSC monthly,difference between the approved rates and interim rates.
In October 2023, Mississippi Power signed an affiliate PPA with Georgia Power for 750 MWs of capacity, which began January 1, 2024 and will continue through December 2028. In order to reachfulfill this PPA and serve the midpointinterests of customers, Mississippi Power now expects electric generating units identified in its 2021 IRP to remain in service beyond the previously indicated dates. Mississippi Power is expected to file its next IRP in April 2024 in accordance with the rules and orders of the authorized retail ROE range then in effect. For 2014 and 2015, Gulf Power recognized reductions in depreciationMississippi PSC. The ultimate outcome of $8.4 million and $20.1 million, respectively. No net reduction in depreciation was recorded in 2016. In 2017, Gulf Power recognized the remaining $34.0 million reduction in depreciation.this matter cannot be determined at this time.
On April 4, 2017,February 6, 2024, the FloridaMississippi PSC approved a settlement agreement (2017 Rate Case Settlement Agreement) among Gulf Power and three intervenors with respect to GulfMississippi Power's request in 2016 to increase retail base rates. Among the terms of the 2017 Rate Case Settlement Agreement, Gulf Power increased ratesfuel revenues by $18 million annually effective with the first billing cycle in July 2017of March 2024.
On February 12, 2024, Mississippi Power submitted its annual ECO Plan filing to provide anthe Mississippi PSC, which requested a $9 million annual overall net customer impact of approximately $54.3 million. The net customer impact consisted of a $62.0 million increase in annual base revenues, less an annual purchased power capacity cost recovery clause creditrevenues. The ultimate outcome of this matter cannot be determined at this time.
See Note 2 to the financial statements under "Mississippi Power" for certain wholesale revenuesadditional information.
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Southern Power continued its authorized retail ROE midpoint (10.25%) and range (9.25% to 11.25%)
On September 20, 2023, Southern Power acquired 100% of the membership interests in the 200-MW Millers Branch solar project located in Haskell County, Texas from EDF Renewables Development, Inc. and is deemedcontinuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to have a maximum equity ratio of 52.5% for all retail regulatory purposes. Gulf Power also began amortizing the regulatory asset associated with the investment balances remaining after the retirement of Plant Smith Units 1 and 2 (357 MWs) over 15 years effective January 1, 2018 and implemented new depreciation rates effective January 1, 2018. The 2017 Rate Case Settlement Agreement also resulted in a $32.5 million write-down of Gulf Power's ownership of Plant Scherer Unit 3 (205 MWs), which was recordedoccur in the firstfourth quarter 2017.2025. The remaining issues relatedproject includes an option to expand capacity up to an additional 300 MWs. Subsequent to December 31, 2023, Southern Power committed to expand the inclusion of Gulf Power's investment in Plant Scherer Unit 3 in retail rates have been resolved as a resultconstruction of the 2017 Rate Case Settlement Agreement, including recoverability of certain costs associatedfacility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the ongoing ownership and operationsecond quarter 2026.
On September 22, 2023, Southern Power acquired 100% of the unit throughmembership interests in the environmental cost recovery clause.
150-MW South Cheyenne solar project located in Laramie County, Wyoming from Hanwha Q Cells USA Corp. and is continuing construction. The 2017 Rate Case Settlement Agreement set forthfacility's output is contracted under a process for addressing20-year PPA and commercial operation is expected to occur in the revenue requirement effects of the Tax Reform Legislation through a prospective change to Gulf Power's base rates. Under the terms of the 2017 Rate Case Settlement Agreement, by March 1, 2018, Gulf Power must identify the revenue requirements impacts and defer them to a regulatory asset or regulatory liability to be considered for prospective application in a change to base rates in a limited scope proceeding before the Florida PSC. In lieu of this approach, on February 14, 2018, the parties to the 2017 Rate Case Settlement Agreement filed a new stipulation and settlement agreement (2018 Tax Reform Settlement Agreement) with the Florida PSC. If approved, the 2018 Tax Reform Settlement Agreement will result in annual reductions of $18.2 million to Gulf Power's base rates and $15.6 million to Gulf Power's environmental cost recovery rates effective beginning the first calendar month following approval.
The 2018 Tax Reform Settlement Agreement also provides for a one-time refund of $69.4 million for the retail portion of unprotected (not subject to normalization) deferred tax liabilities through Gulf Power's fuel cost recovery rate over the remainder of 2018. In addition, a limited scope proceeding to address the flow back of protected deferred tax liabilities will be initiated by May 1, 2018 and Gulf Power will record a regulatory liability for the related 2018 amounts eligible to be returned to customers consistent with IRS normalization principles. Unless otherwise agreed to by the parties to the 2018 Tax Reform Settlement Agreement, amounts recorded in this regulatory liability will be refunded to retail customers in 2019 through Gulf Power's fuel cost recovery rate.
If the 2018 Tax Reform Settlement Agreement is approved, the 2017 Rate Case Settlement Agreement will be amended to increase Gulf Power's maximum equity ratio from 52.5% to 53.5% for regulatory purposes.second quarter 2024.
The ultimate outcome of these matters cannot be determined at this time.
Southern Power calculates an investment coverage ratio for its generating assets, including those owned with various partners, based on the ratio of investment under contract to total investment using the respective facilities' net book value (or expected in-service value for facilities under construction) as the investment amount. With the inclusion of investments associated with facilities under construction, as well as other capacity and energy contracts, Southern Power's average investment coverage ratio at December 31, 2023 was 97% through 2028 and 89% through 2033, with an average remaining contract duration of approximately 12 years.
Mississippi PowerSee Note 15 to the financial statements under "Southern Power" for additional information.
Southern Company Gas
On June 15, 2023, the Illinois Commission concluded its review of the Qualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the second quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an $8 million reduction to revenues and $30 million in estimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a rehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and an equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to be completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the fourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be postponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined in the Illinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to the Illinois Commission's rate case ruling.
Any further cost disallowances by the Illinois Commission in the pending cases could be material to the financial statements of Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
On December 19, 2023, the Georgia PSC approved Atlanta Gas Light's annual GRAM filing, which resulted in an annual base rate increase of $53 million effective January 1, 2024.
On February 7, 2018, Mississippi Power revised1, 2024, Atlanta Gas Light filed its annual projected Performance Evaluationtriennial Integrated Capacity and Delivery Plan (PEP) filing(i-CDP) with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for 2018the next 10 years (2025 through 2034), as well as the required capital investments and related costs to reflectimplement the impacts of the Tax Reform Legislation.programs. The revised filing requests an increase of $26 million in annual revenues, based on ai-CDP reflected
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performance adjusted ROE of 9.33% and an increased equity ratio of 55%.capital investments totaling approximately $0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order on this matter in the third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Southern Company Gas
The natural gas distribution utilities are subject to regulation and oversight by their respective state regulatory agencies forOn August 28, 2023, the rates charged to their customers and other matters. These agencies approve rates designed to provide the opportunity to generate revenues to recover all prudently-incurred costs, including a return on rate base sufficient to pay interest on debt and provide a reasonable ROE.
The natural gas market for Atlanta Gas Light was deregulated in 1997. Accordingly, marketers, rather than a traditional utility, sell natural gas to end-use customers in Georgia and handle customer billing functions. Atlanta Gas Light earns revenue for its distribution services by charging rates to its customers based primarily on monthly fixed charges that are set by the Georgia PSC and adjusted periodically.
With the exception of Atlanta Gas Light, the natural gas distribution utilities are authorized by the relevant regulatory agencies in the states in which they serve to use natural gas cost recovery mechanisms that adjust rates to reflect changes in the wholesale cost of natural gas and ensure recovery of all costs prudently incurred in purchasing natural gas for customers. Natural gas cost recovery revenues are adjusted for differences in actual recoverable natural gas costs and amounts billed in current regulated rates. Changes in the billing factor will not have a significant effect on revenues or net income, but will affect cash flows. In addition to natural gas cost recovery mechanisms, there are other cost recovery mechanisms, such as regulatory riders, which vary by utility but allow recovery of certain costs, such as those related to infrastructure replacement programs, as well as environmental remediation and energy efficiency plans. See Note 1 under "Cost of Natural Gas" for additional information.
Regulatory Infrastructure Programs
Certain of Southern Company Gas' natural gas distribution utilities are involved in ongoing capital projects associated with infrastructure improvement programs that have been previously approved by their applicable state regulatory agencies and provide an appropriate return on invested capital. These infrastructure improvement programs are designed to update or expand the natural gas distribution systems of the natural gas distribution utilities to improve reliability and meet operational flexibility and growth. Initial program lengths range from nine to 10 years, with completion dates ranging from 2020 through 2025.
On February 21, 2017, the Georgia PSC approved a rate adjustment mechanism for Atlanta Gas Light that included the 2017 capital investment associated with a four-year extension of one of its existing infrastructure programs, with a total additional investment of $177 million through 2020.
Base Rate Cases
On January 31, 2018, the Illinois CommerceVirginia Commission approved a $137stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for a $48 million increase in Nicor Gas' annual base rate revenues including $93 million related to the recovery of investments under Nicor Gas' infrastructure program, effective February 8, 2018, based on a ROE of 9.8%.
The Illinois Commerce Commission issued9.70% and an orderequity ratio of 49.06%. Interim rates became effective as of January 25, 2018 that requires utilities in1, 2023, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $69 million. Refunds to customers related to the state to recorddifference between the impacts of the Tax Reform Legislation, including the reduction in the corporate income tax rate to 21%approved rates effective September 1, 2023 and the impactinterim rates were completed during the fourth quarter 2023.
On February 9, 2024, Virginia Natural Gas filed with the Virginia Commission a request to extend the existing SAVE program through 2029. The request includes investments of excess deferred income taxes, as$70 million in each year from 2025 through 2029, with a regulatory liability. On February 20, 2018,potential variance of up to $5 million allowed for the Illinois Commerce Commission granted Nicor Gas' applicationprogram, for rehearing to file revised base rates and tariffs, which Nicora maximum total investment over the five-year extension (2025 through 2029) of $355 million. Virginia Natural Gas expects the Virginia Commission to file by the end of the second quarter 2018.
On December 1, 2017, Atlanta Gas Light filed its 2018 annual rate adjustment with the Georgia PSC. If approved, Atlanta Gas Light's annual base rate revenues will increase by $22 million, effective June 1, 2018. Atlanta Gas Light will fileissue a revised rate adjustment to incorporate the effects of the Tax Reform Legislation in the first quarter 2018. The Georgia PSC is expected to rulefinal order on the revised requested increasethis matter in the second quarter 2018.
2024. The ultimate outcome of these matters cannot be determined at this time.
Kemper County Energy Facility
Overview
The Kemper County energy facility was designed to utilize IGCC technology with an expected output capacity of 582 MWs and to be fueled by locally mined lignite (an abundant, lower heating value coal) from a mine owned by Mississippi Power and situated adjacent to the Kemper County energy facility. The mine, operated by North American Coal Corporation, started
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commercial operation in 2013. In connection with the Kemper County energy facility construction, Mississippi Power constructed approximately 61 miles of CO2 pipeline infrastructure for the transport of captured CO2 for use in enhanced oil recovery.
Schedule and Cost Estimate
In 2012, the Mississippi PSC issued the 2012 MPSC CPCN Order, confirming the CPCN originally approved by the Mississippi PSC in 2010 authorizing the acquisition, construction, and operation of the Kemper County energy facility. The certificated cost estimate of the Kemper County energy facility included in the 2012 MPSC CPCN Order was $2.4 billion, net of approximately $0.57 billion for the cost of the lignite mine and equipment, the cost of the CO2 pipeline facilities, AFUDC, and certain general exceptions (Cost Cap Exceptions). The 2012 MPSC CPCN Order approved a construction cost cap of up to $2.88 billion, with recovery of prudently-incurred costs subject to approval by the Mississippi PSC. The Kemper County energy facility was originally projected to be placed in service in May 2014. Mississippi Power placed the combined cycle and the associated common facilities portion of the Kemper County energy facility in service in August 2014.
The initial production of syngas began on July 14, 2016 for gasifier "B" and on September 13, 2016 for gasifier "A." Mississippi Power achieved integrated operation of both gasifiers on January 29, 2017, including the production of electricity from syngas in both combustion turbines. During testing, the plant produced and captured CO2, and produced sulfuric acid and ammonia, each of acceptable quality under the related off-take agreements. However, Mississippi Power experienced numerous challenges during the extended start-up process to achieve integrated operation of the gasifiers on a sustained basis. In May 2017, after achieving these milestones, Mississippi Power determined that a critical system component, the syngas coolers, would need replacement sooner than originally planned, which would require significant lead time and significant cost. In addition, the long-term natural gas price forecast had decreased significantly and the estimated cost of operating and maintaining the facility during the first five full years of operations had increased significantly since certification.
On June 21, 2017, the Mississippi PSC stated its intent to issue an order (which occurred on July 6, 2017) directing Mississippi Power to pursue a settlement under which the Kemper County energy facility would be operated as a natural gas plant, rather than an IGCC plant, and address all issues associated with the Kemper County energy facility (Kemper Settlement Order). The Kemper Settlement Order established a new docket for the purposes of pursuing a global settlement of the related costs (Kemper Settlement Docket). On June 28, 2017, Mississippi Power notified the Mississippi PSC that it would begin a process to suspend operations and start-up activities on the gasifier portion of the Kemper County energy facility, given the uncertainty as to its future. On February 6, 2018, the Mississippi PSC voted to approve a settlement agreement related to cost recovery for the Kemper County energy facility among Mississippi Power, the MPUS, and certain intervenors (Kemper Settlement Agreement).
At the time of project suspension in June 2017, the total cost estimate for the Kemper County energy facility was approximately $7.38 billion, including approximately $5.95 billion of costs subject to the construction cost cap, and was net of the $137 million in additional grants from the DOE for the Kemper County energy facility. In the aggregate, Mississippi Power had recorded charges to income of $3.07 billion ($1.89 billion after tax) as a result of changes in the cost estimate above the cost cap for the Kemper IGCC through May 31, 2017.
Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, Mississippi Power recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine. During the third and fourth quarters of 2017, Mississippi Power recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during the suspension period prior to conclusion of the Kemper Settlement Docket, as well as the charge associated with the Kemper Settlement Agreement discussed below. Additional pre-tax cancellation costs, including mine and plant closure and contract termination costs, currently estimated at approximately $50 million to $100 million (excluding salvage), are expected to be incurred in 2018. Mississippi Power has begun efforts to dispose of or abandon the mine and gasifier-related assets.
Rate Recovery
Kemper Settlement Agreement
On February 6, 2018, the Mississippi PSC voted to approve the Kemper Settlement Agreement. The Kemper Settlement Agreement provides for an annual revenue requirement of approximately $99.3 million for costs related to the Kemper County energy facility, which includes the impact of Tax Reform Legislation. The revenue requirement is based on (i) a fixed ROE for 2018 of 8.6% excluding any performance adjustment, (ii) a ROE for 2019 calculated in accordance with PEP, excluding the performance adjustment, (iii) for future years, a performance-based ROE calculated pursuant to PEP, and (iv) amortization periods for the related regulatory assets and liabilities of eight years and six years, respectively. The revenue requirement also
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reflects a disallowance related to a portion of Mississippi Power's investment in the Kemper County energy facility requested for inclusion in rate base, which was recorded in the fourth quarter 2017 as an additional charge to income of approximately $78 million ($85 million net of accumulated depreciation of $7 million) pre-tax ($48 million after tax).
Under the Kemper Settlement Agreement, retail customer rates will reflect a reduction of approximately $26.8 million annually and include no recovery for costs associated with the gasifier portion of the Kemper County energy facility in 2018 or at any future date. On February 12, 2018, Mississippi Power made the required compliance filing with the Mississippi PSC. The Kemper Settlement Agreement also requires (i) the CPCN for the Kemper County energy facility to be modified to limit it to natural gas combined cycle operation and (ii) Mississippi Power to file a reserve margin plan with the Mississippi PSC by August 2018.
As of December 31, 2017, the balances associated with the Kemper County energy facility regulatory assets and liabilities were $114 million and $26 million, respectively.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges.
2015 Rate Case
On December 3, 2015, the Mississippi PSC issued the In-Service Asset Rate Order regarding the Kemper County energy facility assets that were commercially operational and currently providing service to customers (the transmission facilities, combined cycle, natural gas pipeline, and water pipeline) and other related costs. The In-Service Asset Rate Order provided for retail rate recovery of an annual revenue requirement of approximately $126 million, based on Mississippi Power's actual average capital structure, with a maximum common equity percentage of 49.733%, a 9.225% return on common equity, and actual embedded interest costs. The In-Service Asset Rate Order also included a prudence finding of all costs in the stipulated revenue requirement calculation for the in-service assets.
In connection with the implementation of the In-Service Asset Rate Order and wholesale rates, Mississippi Power began expensing certain ongoing project costs and certain retail debt carrying costs that previously were deferred and began amortizing certain regulatory assets associated with assets placed in service and consulting and legal fees over periods ranging from two years to 10 years. On July 6, 2017, the Mississippi PSC issued an order requiring Mississippi Power to establish a regulatory liability account to maintain current rates related to the Kemper County energy facility following the July 2017 completion of the amortization period for certain of these regulatory assets.
Lignite Mine and CO2 Pipeline Facilities
Mississippi Power owns the lignite mine and equipment and mineral reserves located around the Kemper County energy facility site. The mine started commercial operation in June 2013.
In 2010, Mississippi Power executed a 40-year management fee contract with Liberty Fuels Company, LLC (Liberty Fuels), a wholly-owned subsidiary of The North American Coal Corporation, which developed, constructed, and is responsible for the mining operations through the end of the mine reclamation. As the mining permit holder, Liberty Fuels has a legal obligation to perform mine reclamation and Mississippi Power has a contractual obligation to fund all reclamation activities. Mississippi Power expects mine reclamation to begin in 2018. In addition to the obligation to fund the reclamation activities, Mississippi Power provided working capital support to Liberty Fuels through cash advances for capital purchases, payroll, and other operating expenses.
In addition, Mississippi Power constructed the CO2 pipeline for the planned transport of captured CO2 for use in enhanced oil recovery and entered into an agreement with Denbury Onshore (Denbury) to purchase the captured CO2. Denbury has the right to terminate the contract at any time because Mississippi Power did not place the Kemper IGCC in service by July 1, 2017.
The ultimate outcome of these matters cannot be determined at this time.
Litigation
On April 26, 2016, a complaint against Mississippi Power was filed in Harrison County Circuit Court (Circuit Court) by Biloxi Freezing & Processing Inc., Gulfside Casino Partnership, and John Carlton Dean, which was amended and refiled on July 11, 2016 to include, among other things, Southern Company as a defendant. The individual plaintiff alleges that Mississippi Power and Southern Company violated the Mississippi Unfair Trade Practices Act. All plaintiffs have alleged that Mississippi Power and Southern Company concealed, falsely represented, and failed to fully disclose important facts concerning the cost and schedule of the Kemper County energy facility and that these alleged breaches have unjustly enriched Mississippi Power and Southern Company. The plaintiffs seek unspecified actual damages and punitive damages; ask the Circuit Court to appoint a receiver to oversee, operate, manage, and otherwise control all affairs relating to the Kemper County energy facility; ask the Circuit Court to
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revoke any licenses or certificates authorizing Mississippi Power or Southern Company to engage in any business related to the Kemper County energy facility in Mississippi; and seek attorney's fees, costs, and interest. The plaintiffs also seek an injunction to prevent any Kemper County energy facility costs from being charged to customers through electric rates. On June 23, 2017, the Circuit Court ruled in favor of motions by Southern Company and Mississippi Power and dismissed the case. On July 7, 2017, the plaintiffs filed notice of an appeal. Southern Company believes this legal challenge has no merit; however, an adverse outcome in this proceeding could have a material impact on Southern Company's results of operations, financial condition, and liquidity. Southern Company intends to vigorously defend itself in this matter and the ultimate outcome of this matter cannot be determined at this time.
On June 9, 2016, Treetop, Greenleaf CO2 Solutions, LLC (Greenleaf), Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC,
Key Performance Indicators
In striving to achieve attractive risk-adjusted returns while providing cost-effective energy to approximately 8.9 million electric and Tellus Operating Group filed a complaint against Mississippi Power,gas utility customers collectively, the traditional electric operating companies and Southern Company Gas continue to focus on several key performance indicators. These indicators include, but are not limited to, customer satisfaction, plant availability, electric and natural gas system reliability, and execution of major construction projects. In addition, Southern Company and SCSthe Subsidiary Registrants focus on earnings per share (EPS) and net income, respectively, as a key performance indicator. See RESULTS OF OPERATIONS herein for information on the Registrants' financial performance.
The financial success of the traditional electric operating companies and Southern Company Gas is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. The traditional electric operating companies use customer satisfaction surveys to evaluate their results and generally target the top quartile of these surveys in the state court in Gwinnett County, Georgia. The complaint relatedmeasuring performance. Reliability indicators are also used to evaluate results. See Note 2 to the cancelled CO2 contract with Treetopfinancial statements under "Alabama Power – Rate RSE" and alleged fraudulent misrepresentation, fraudulent concealment, civil conspiracy,"Mississippi Power – Performance Evaluation Plan" for additional information on Alabama Power's Rate RSE and breachMississippi Power's PEP rate plan, respectively, both of contract onwhich contain mechanisms that directly tie customer service indicators to the part of Mississippi Power, allowed equity return.
Southern Company Gas also continues to focus on several operating metrics, including Heating Degree Days, customer count, and SCS and sought compensatory damagesvolumes of $100 million, as well as unspecified punitive damages.natural gas sold. Southern Company MississippiGas measures weather and the effect on its business using Heating Degree Days. Generally, increased Heating Degree Days result in higher demand for natural gas on Southern Company Gas' distribution system. See RESULTS OF OPERATIONS – "Southern Company Gas" for additional information on Southern Company Gas' operating metrics.
Southern Power and SCS movedcontinues to compel arbitration pursuantfocus on several key performance indicators, including, but not limited to, the terms of the CO2equivalent forced outage rate and contract which the court granted on May 4, 2017. On June 28, 2017, Treetop, Greenleaf, Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC,availability to evaluate operating results and Tellus Operating Group filed a claim for arbitration requesting $500 million in damages. On December 28, 2017, Mississippi Power reached a settlement agreement with Treetop, Greenleaf, Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC, and Tellus Operating Group and the arbitration was dismissed.
Nuclear Construction
Project Status
In 2009, the Georgia PSC certified construction of Plant Vogtle Units 3 and 4. In 2012, the NRC issued the related combined construction and operating licenses, which allowed full construction of the two AP1000 nuclear units (with electric generating capacity of approximately 1,100 MWs each) and related facilitieshelp ensure its ability to begin. Until March 2017, construction on Plant Vogtle Units 3 and 4 continued under the Vogtle 3 and 4 Agreement, which was a substantially fixed price agreement. On March 29, 2017, the EPC Contractor filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code.
In connection with the EPC Contractor's bankruptcy filing, Georgia Power, acting for itself and as agent for the Vogtle Owners, entered into the Interim Assessment Agreement with the EPC Contractormeet its contractual commitments to allow construction to continue. The Interim Assessment Agreement expired on July 27, 2017 when the Vogtle Services Agreement became effective. In August 2017, following completion of comprehensive cost to complete and cancellation cost assessments, Georgia Power filed its seventeenth VCM report with the Georgia PSC, which included a recommendation to continue construction of Plant Vogtle Units 3 and 4, with Southern Nuclear serving as project manager and Bechtel serving as the primary construction contractor. On December 21, 2017, the Georgia PSC approved Georgia Power's recommendation to continue construction.
Georgia Power expects Plant Vogtle Units 3 and 4 to be placed in service by November 2021 and November 2022, respectively. Georgia Power's revised capital cost forecast for its 45.7% proportionate share of Plant Vogtle Units 3 and 4 is $8.8 billion ($7.3 billion after reflecting the impact of payments received under the Guarantee Settlement Agreement and the Customer Refunds, each as defined herein). Georgia Power's CWIP balance for Plant Vogtle Units 3 and 4 was $3.3 billion at December 31, 2017, which is net of the Guarantee Settlement Agreement payments less the Customer Refunds. Georgia Power estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
Vogtle 3 and 4 Agreement and EPC Contractor Bankruptcy
In 2008, Georgia Power, acting for itself and as agent for the Vogtle Owners, entered into the Vogtle 3 and 4 Agreement. Under the terms of the Vogtle 3 and 4 Agreement, the Vogtle Owners agreed to pay a purchase price subject to certain price escalations and adjustments, including fixed escalation amounts and index-based adjustments, as well as adjustments for change orders, and performance bonuses for early completion and unit performance. Under the Toshiba Guarantee, Toshiba guaranteed certain payment obligations of the EPC Contractor, including any liability of the EPC Contractor for abandonment of work. In the first quarter 2016, Westinghouse delivered to the Vogtle Owners a total of $920 million of letters of credit from financial institutions (Westinghouse Letters of Credit) to secure a portion of the EPC Contractor's potential obligations under the Vogtle 3 and 4 Agreement.
Subsequent to the EPC Contractor bankruptcy filing, a number of subcontractors to the EPC Contractor alleged non-payment by the EPC Contractor for amounts owed for work performed on Plant Vogtle Units 3 and 4. Georgia Power, acting for itself and as agent for the Vogtle Owners, has taken actions to remove liens filed by these subcontractors through the posting of surety bonds.customers.
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RESULTS OF OPERATIONS
Southern Company
Consolidated net income attributable to Southern Company was $4.0 billion in 2023, an increase of $452 million, or 12.8%, from 2022. The increase was primarily due to lower non-fuel operations and Subsidiary Companies 2017 Annual Report

Related to such liens, certain subcontractors have filed, and additional subcontractors may file, actions against the EPC Contractor and the Vogtle Owners to preserve their payment rights with respect to such claims. All amountsmaintenance costs, an increase in retail electric revenues associated with the removal of subcontractor liensrates and other EPC Contractor pre-petition accounts payable have been paid or accrued as of December 31, 2017.
On June 9, 2017, Georgia Power and the other Vogtle Owners and Toshiba entered intopricing, a settlement agreement regarding the Toshiba Guarantee (Guarantee Settlement Agreement). Pursuant to the Guarantee Settlement Agreement, Toshiba acknowledged the amount of its obligation was $3.68 billion (Guarantee Obligations), of which Georgia Power's proportionate share was approximately $1.7 billion. The Guarantee Settlement Agreement provided fordecrease in income tax expense, a schedule of payments for the Guarantee Obligations beginningdecrease in October 2017 and continuing through January 2021. Toshiba made the first three payments as scheduled. On December 8, 2017, Georgia Power, the other Vogtle Owners, certain affiliates of the Municipal Electric Authority of Georgia (MEAG Power), and Toshiba entered into Amendment No. 1 to the Guarantee Settlement Agreement (Guarantee Settlement Agreement Amendment). The Guarantee Settlement Agreement Amendment provided that Toshiba's remaining payment obligations under the Guarantee Settlement Agreement were due and payable in full on December 15, 2017, which Toshiba satisfied on December 14, 2017. Pursuant to the Guarantee Settlement Agreement Amendment, Toshiba was deemed to be the owner of certain pre-petition bankruptcy claims of Georgia Power, the other Vogtle Owners, and certain affiliates of MEAG Power against Westinghouse, and Georgia Power and the other Vogtle Owners surrendered the Westinghouse Letters of Credit.
Additionally, on June 9, 2017, Georgia Power, acting for itself and as agent for the other Vogtle Owners, and the EPC Contractor entered into the Vogtle Services Agreement, which was amended and restated on July 20, 2017. On July 20, 2017, the bankruptcy court approved the EPC Contractor's motion seeking authorization to (i) enter into the Vogtle Services Agreement, (ii) assume and assign to the Vogtle Owners certain project-related contracts, (iii) join the Vogtle Owners as counterparties to certain assumed project-related contracts, and (iv) reject the Vogtle 3 and 4 Agreement. The Vogtle Services Agreement, and the EPC Contractor's rejection of the Vogtle 3 and 4 Agreement, became effective upon approval by the DOE on July 27, 2017. The Vogtle Services Agreement will continue until the start-up and testing of Plant Vogtle Units 3 and 4 are complete and electricity is generated and sold from both units. The Vogtle Services Agreement is terminable by the Vogtle Owners upon 30 days' written notice.
Effective October 23, 2017, Georgia Power, acting for itself and as agent for the other Vogtle Owners, entered into a construction completion agreement with Bechtel, whereby Bechtel will serve as the primary contractor for the remaining construction activities for Plant Vogtle Units 3 and 4 (Bechtel Agreement). Facility design and engineering remains the responsibility of the EPC Contractor under the Vogtle Services Agreement. The Bechtel Agreement is a cost reimbursable plus fee arrangement, whereby Bechtel will be reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Vogtle Owner is severally (not jointly) liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The Vogtle Owners may terminate the Bechtel Agreement at any time for their convenience, provided that the Vogtle Owners will be required to pay amountsafter-tax charges related to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs, and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Vogtle Owner suspensions of work, certain breaches of the Bechtel Agreement by the Vogtle Owners, Vogtle Owner insolvency, and certain other events. Pursuant to the Loan Guarantee Agreement between Georgia Power and the DOE, Georgia Power is required to obtain the DOE's approval of the Bechtel Agreement prior to obtaining any further advances under the Loan Guarantee Agreement.
On November 2, 2017, the Vogtle Owners entered into an amendment to their joint ownership agreements for Plant Vogtle Units 3 and 4 (as amended, Vogtle Joint Ownership Agreements) to provide for, among other conditions, additional Vogtle Owner approval requirements. Pursuant to the Vogtle Joint Ownership Agreements, the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 must vote to continue construction if certain adverse events occur, including (i) the bankruptcy of Toshiba; (ii) termination or rejection in bankruptcy of certain agreements, including the Vogtle Services Agreement or the Bechtel Agreement; (iii) the Georgia PSC or Georgia Power determines that any of Georgia Power's costs relating to the construction of Plant Vogtle Units 3 and 4, will not be recoveredan increase in other revenues, an increase in natural gas revenues from rate increases and continued infrastructure replacement, and a goodwill impairment charge in 2022 at PowerSecure, partially offset by higher depreciation and amortization, higher interest expense, and a decrease in retail electric revenues associated with milder weather in 2023 compared to 2022. See Notes 1 and 2 to the financial statements under "Goodwill and Other Intangible Assets" and "Georgia Power – Nuclear Construction," respectively, for additional information.
Basic EPS was $3.64 in 2023 and $3.28 in 2022. Diluted EPS, which factors in additional shares related to stock-based compensation, was $3.62 in 2023 and $3.26 in 2022. EPS for 2023 and 2022 was negatively impacted by $0.06 and $0.04 per share, respectively, as a result of increases in the average shares outstanding. See Note 8 to the financial statements under "Outstanding Classes of Capital Stock – Southern Company" for additional information.
Dividends paid per share of common stock were $2.78 in 2023 and $2.70 in 2022. In January 2024, Southern Company declared a quarterly dividend of 70 cents per share. For 2023, the dividend payout ratio was 76% compared to 82% for 2022.
Discussion of Southern Company's results of operations is divided into three parts – the Southern Company system's primary business of electricity sales, its gas business, and its other business activities.
20232022
(in millions)
Electricity business$3,994 $3,672 
Gas business615 572 
Other business activities(633)(720)
Net Income$3,976 $3,524 
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Electricity Business
Southern Company's electric utilities generate and sell electricity to retail and wholesale customers. A condensed statement of income for the electricity business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Electric operating revenues$19,998 $(2,875)
Fuel4,365 (2,470)
Purchased power883 (710)
Cost of other sales171 57 
Other operations and maintenance4,679 (550)
Depreciation and amortization3,865 836 
Taxes other than income taxes1,159 34 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total electric operating expenses15,054 (3,054)
Operating income4,944 179 
Allowance for equity funds used during construction247 37 
Interest expense, net of amounts capitalized1,274 207 
Other income (expense), net533 17 
Income taxes583 (265)
Net income3,867 291 
Less:
Dividends on preferred stock of subsidiaries (11)
Net loss attributable to noncontrolling interests(127)(20)
Net Income Attributable to Southern Company$3,994 $322 
Electric Operating Revenues
Electric operating revenues for 2023 were $20.0 billion, reflecting a $2.9 billion, or 12.6%, decrease from 2022. Details of electric operating revenues were as follows:
 20232022
 (in millions)
Retail electric — prior year$18,197 
Estimated change resulting from —
Rates and pricing437 
Sales decline(33)
Weather(229)
Fuel and other cost recovery(2,029)
Retail electric — current year$16,343 $18,197 
Wholesale electric revenues2,467 3,641 
Other electric revenues792 747 
Other revenues396 288 
Electric operating revenues$19,998 $22,873 
Retail electric revenues decreased $1.9 billion, or 10.2%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing in 2023 was primarily due to base tariff increases in accordance with Georgia Power's 2022 ARP, revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed
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retail ROE range, an increase in Rate CNP Compliance revenues at Alabama Power, and a lower Rate RSE customer refund accrual in 2023 compared to 2022 at Alabama Power, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in the revenues recognized under the NCCR tariff, both at Georgia Power.
Electric rates for the traditional electric operating companies include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of PPA costs, and do not affect net income. The traditional electric operating companies each have one or more regulatory mechanisms to recover other costs such as environmental and other compliance costs, storm damage, new plants, and PPA capacity costs.
See Note 2 to the financial statements under "Alabama Power" and "Georgia Power" for additional information. Also see "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Wholesale electric revenues from power sales were as follows:
20232022
 (in millions)
Capacity and other$630 $625 
Energy1,837 3,016
Total$2,467 $3,641 
In 2023, wholesale electric revenues decreased $1.2 billion, or 32.2%, as compared to 2022 primarily due to a decrease in energy revenues. Energy revenues decreased $884 million at Southern Power and $295 million at the traditional electric operating companies primarily due to fuel and purchased power price decreases compared to 2022. Also contributing to the Southern Power decrease was a net decrease in the volume of KWHs sold primarily associated with natural gas PPAs.
Wholesale electric revenues consist of revenues from PPAs and short-term opportunity sales. Wholesale electric revenues from PPAs (other than solar and wind PPAs) have both capacity and energy components. Capacity revenues generally represent the greatest contribution to net income and are designed to provide recovery of fixed costs plus a return on investment. Energy revenues will vary depending on fuel prices, the market prices of wholesale energy compared to the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Energy sales from solar and wind PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or through a fixed price related to the energy. As a result, the ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Wholesale electric revenues at Mississippi Power include FERC-regulated MRA sales under cost-based tariffs as well as market-based sales. Short-term opportunity sales are made at market-based rates that generally provide a margin above the Southern Company system's variable cost to produce the energy.
Other Electric Revenues
Other electric revenues increased $45 million, or 6.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $23 million in outdoor lighting sales at Georgia Power, $18 million resulting from receipts of liquidated damages associated with generation facility production guarantees and an arbitration award at Southern Power, $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs at Georgia Power, and $17 million in retail solar program fees at Georgia Power, partially offset by decreases of $25 million in cogeneration steam revenues associated with lower natural gas prices at Alabama Power and $14 million in rent revenues primarily at Alabama Power.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential47.1 (5.1)%(0.5)%
Commercial48.3 0.1 1.3 
Industrial48.6 (1.9)(1.9)
Other0.5 (7.2)(6.8)
Total retail144.5 (2.3)(0.4)%
Wholesale51.0 (9.4)
Total energy sales195.5 (4.3)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in the applicable service territory over a specified historical period. This metric is useful because suchit allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Weather-adjusted retail energy sales decreased 587 million KWHs in 2023 as compared to 2022. Weather-adjusted residential KWH sales decreased 0.5% primarily due to decreased customer usage, partially offset by customer growth. Weather-adjusted commercial KWH sales increased 1.3% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 1.9% primarily due to decreases in the chemicals, forest products, and textiles sectors.
See "Electric Operating Revenues" above for a discussion of significant changes in wholesale revenues related to changes in price and KWH sales.
Other Revenues
Other revenues increased $108 million, or 37.5%, in 2023 as compared to 2022. The increase was primarily due to increases of $54 million in power delivery construction and maintenance projects at Georgia Power, $34 million in unregulated sales of products and services at Alabama Power, and $25 million associated with energy conservation projects at Georgia Power.
Fuel and Purchased Power Expenses
The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, the electric utilities purchase a portion of their electricity needs from the wholesale market.
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Details of the Southern Company system's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)(b)
184 186 
Total purchased power (in billions of KWHs)
18 25 
Sources of generation (percent)(a) —
Gas54 51 
Nuclear(b)
18 16 
Coal17 22 
Hydro3 
Wind, Solar, and Other8 
Cost of fuel, generated (in cents per net KWH) 
Gas(a)
2.77 5.29 
Nuclear(b)
0.76 0.72 
Coal4.33 3.67 
Average cost of fuel, generated (in cents per net KWH)(a)(b)
2.68 4.05 
Average cost of purchased power (in cents per net KWH)(c)
5.17 7.66 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are deemed unreasonablecharged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(c)Average cost of purchased power includes fuel purchased by the Southern Company system for tolling agreements where power is generated by the provider.
In 2023, total fuel and purchased power expenses were $5.2 billion, a decrease of $3.2 billion, or imprudent;37.7%, as compared to 2022. The decrease was primarily the result of a $2.7 billion decrease in the average cost of fuel generated and purchased and a $513 million net decrease in the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions at the traditional electric operating companies are generally offset by fuel revenues and do not have a significant impact on net income. See Note 2 to the financial statements for additional information. Fuel expenses incurred under Southern Power's PPAs are generally the responsibility of the counterparties and do not significantly impact net income.
Fuel
In 2023, fuel expense was $4.4 billion, a decrease of $2.5 billion, or (iv)36.1%, as compared to 2022. The decrease was primarily due to a 47.6% decrease in the average cost of natural gas per KWH generated and a 22.5% decrease in the volume of KWHs generated by coal, partially offset by an 18.2% decrease in the volume of KWHs generated by hydro, an 18.0% increase in the average cost of coal per KWH generated, a 10.8% increase in the volume of KWHs generated by nuclear, and a 6.9% increase in the volume of KWHs generated by natural gas.
Purchased Power
In 2023, purchased power expense was $883 million, a decrease of $710 million, or 44.6%, as compared to 2022. The decrease was primarily due to a 32.5% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 27.5% decrease in the volume of KWHs purchased.
Energy purchases will vary depending on demand for energy within the Southern Company system's electric service territory, the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, and the availability of the Southern Company system's generation.
Cost of Other Sales
Cost of other sales increased $57 million, or 50.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $40 million from unregulated power delivery construction and maintenance projects at Georgia Power and $20 million in expenses related to unregulated products and services at Alabama Power.
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Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $550 million, or 10.5%, in 2023 as compared to 2022. The decrease reflects a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred at Alabama Power. Excluding this decrease, there were decreases of $223 million in transmission and distribution expenses primarily related to line maintenance, $182 million in storm damage recovery as authorized in Georgia Power's 2022 ARP, $91 million in generation non-outage maintenance expenses and planned outages, and $50 million in employee compensation and benefit expenses, partially offset by an $86 million increase in technology infrastructure and application production costs and a $73 million increase in generation environmental projects primarily at Georgia Power. See Note 1 to the financial statements under "Storm Damage and Reliability Reserves" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $836 million, or 27.6%, in 2023 as compared to 2022. The increase was primarily due to increases of $541 million and $190 million resulting from higher depreciation rates at Alabama Power and Georgia Power, respectively, and $79 million from additional plant in service. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $34 million, or 3.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $62 million in property taxes primarily at Georgia Power resulting from an increase in the construction budget containedassessed value of property and $14 million in utility license taxes at Alabama Power, partially offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues at Georgia Power.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the seventeenth VCM report of more than $1 billion or extension of the project schedule contained in the seventeenth VCM report of more than one year. In addition, pursuant to the Vogtle Joint Ownership Agreements, the required approval of holders of ownership interests inestimated probable loss on Plant Vogtle Units 3 and 4 is at least (i) 90% for a change of the primary construction contractortotaling $(68) million and (ii) 67% for material amendments$183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect Georgia Power's revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Services AgreementUnits 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $37 million, or agreements17.6%, in 2023 as compared to 2022. The increase was primarily associated with Southern Nuclear or the primary construction contractor, including the Bechtel Agreement. The Vogtle Joint Ownership Agreements also confirm that the Vogtle Owners' sole recourse againstan increase in capital expenditures subject to AFUDC at Georgia Power and an increase in capital expenditures related to hydro production and Plant Barry Unit 8 construction at Alabama Power. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $207 million, or Southern Nuclear19.4%, in 2023 as compared to 2022. The increase reflects approximately $120 million related to higher interest rates and $96 million related to higher average outstanding borrowings. See Note 8 to the financial statements for any actionadditional information.
Other Income (Expense), Net
Other income (expense), net increased $17 million, or inaction3.3%, in connection with their performance2023 as agent for the Vogtle Owners is limitedcompared to removal of2022 primarily due to a $48 million decrease in charitable donations primarily at Georgia Power, and/a $15 million increase in interest income, and a $14 million decrease in non-operating benefit-related expenses at Alabama Power, partially offset by a $42 million decrease in non-service cost-related retirement benefits income and a $13 million decrease in customer charges related to contributions in aid of construction at Georgia Power. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $265 million, or Southern Nuclear31.3%, in 2023 as agent, exceptcompared to 2022. The decrease was primarily due to a $252 million increase in casesthe flowback of willful misconduct.certain excess deferred income taxes at Alabama Power, an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards at Georgia Power, generation of $35 million of advanced nuclear PTCs at Georgia Power, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward at Georgia Power, partially offset by a $145 million decrease in the flowback of certain excess deferred income taxes at Georgia Power that ended in 2022. See Note 10 to the financial statements for additional information.
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NOTES (continued)COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Net Loss Attributable to Noncontrolling Interests
Substantially all noncontrolling interests relate to renewable projects at Southern Power. Net loss attributable to noncontrolling interests increased $20 million, or 18.7%, in 2023 as compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to Southern Power's wind tax equity partners and $5 million in lower income allocations to Southern Power's equity partners, partially offset by $10 million in lower HLBV loss allocations to Southern Power's battery energy storage partners.
Gas Business
Southern Company Gas distributes natural gas through utilities in four states and Subsidiary Companies 2017 Annual Reportis involved in several other complementary businesses including gas pipeline investments and gas marketing services.
A condensed statement of income for the gas business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Income taxes211 31 
Net income$615 $43 
During the period from November through March when natural gas usage and operating revenues are generally higher (Heating Season), more customers are connected to Southern Company Gas' distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively equally over any given year. Thus, operating results can vary significantly from quarter to quarter as a result of seasonality. For 2023, the percentage of operating revenues and net income generated during
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the Heating Season (January through March and November through December) were 67% and 73%, respectively. For 2022, the percentage of operating revenues and net income generated during the Heating Season were 67% and 66%, respectively.
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Southern Company Gas hedged its exposure to warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. The remaining impacts of weather on earnings were immaterial.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, the natural gas distribution utilities rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at the natural gas distribution utilities represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, in 2023 compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses increased $18 million, or 1.5%, in 2023 compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
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Depreciation and Amortization
Depreciation and amortization increased $23 million, or 4.1%, in 2023 compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes decreased $20 million, or 7.1%, in 2023 compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $47 million, or 17.9%, in 2023 compared to 2022. The increase reflects approximately $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
Income taxes increased $31 million, or 17.2%, in 2023 compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Other Business Activities
Southern Company's other business activities primarily include the parent company (which does not allocate operating expenses to business units); PowerSecure, which provides distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers; Southern Holdings, which invests in various projects; and Southern Linc, which provides digital wireless communications for use by the Southern Company system and also markets these services to the public and provides fiber optics services within the Southeast.
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A condensed statement of operations for Southern Company's other business activities follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$554 $110 
Cost of other sales355 87 
Other operations and maintenance175 (26)
Depreciation and amortization77 
Taxes other than income taxes4 — 
Impairment charges (119)
Gain on dispositions, net 14 
Total operating expenses611 (42)
Operating income (loss)(57)152 
Earnings from equity method investments5 
Interest expense863 171 
Other income (expense), net(16)39 
Income taxes (benefit)(298)(65)
Net loss$(633)$87 
Operating Revenues
Operating revenues for these other business activities increased $110 million, or 24.8%, in 2023 as compared to 2022 primarily due to increases of $92 million related to distributed infrastructure projects at PowerSecure and $24 million primarily related to sales associated with commercial customers at Southern Linc.
Cost of Other Sales
Cost of other sales for these other business activities increased $87 million, or 32.5%, in 2023 as compared to 2022 primarily due to increases of $58 million related to distributed infrastructure projects at PowerSecure and $23 million primarily related to sales associated with commercial customers at Southern Linc.
Other Operations and Maintenance
Other operations and maintenance expenses for these other business activities decreased $26 million, or 12.9%, in 2023 as compared to 2022 primarily due to a decrease at the parent company related to cost containment efforts and lower director compensation expenses.
Impairment Charges
In 2022, a goodwill impairment charge of $119 million was recorded at PowerSecure. See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information.
Gain on Dispositions, Net
In 2022, a $14 million gain was recorded at the parent company as a result of the early termination of the transition services agreement related to the 2019 sale of Gulf Power.
Interest Expense
Interest expense for these other business activities increased $171 million, or 24.7%, in 2023 as compared to 2022. The increase primarily results from parent company financing activities and includes approximately $112 million related to higher interest rates and $73 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
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Other Income (Expense), Net
Other income (expense), net for these other business activities increased $39 million, or 70.9%, in 2023 as compared to 2022 primarily due to a $29 million decrease in charitable donations and a $12 million increase in interest income, both primarily at the parent company. See Note 15 to the financial statements under "Southern Company" for additional information.
Income Taxes (Benefit)
The income tax benefit for these other business activities increased $65 million, or 27.9%, in 2023 as compared to 2022. The increase was primarily due to a $35 million tax benefit in 2023 related to a reversal of an uncertain tax position associated with the 2019 sale of Gulf Power and higher pre-tax losses, both at the parent company.
Alabama Power
Alabama Power's 2023 net income after dividends on preferred stock was $1.37 billion, representing a $30 million, or 2.2%, increase from 2022. The increase was primarily due to a decrease in income tax expense, an increase in Rate CNP Compliance revenues, a decrease in operations and maintenance expenses primarily related to the reliability reserve, and a lower Rate RSE customer refund accrual in 2023 compared to 2022. These increases to net income were offset by an increase in depreciation rates effective January 2023, a decrease in retail revenues associated with milder weather in Alabama Power's service territory in the first and second quarters of 2023 compared to the corresponding periods in 2022, and increases in capacity-related expenses and interest expense. See Note 2 to the financial statements under "Alabama Power" for additional information.
A condensed income statement for Alabama Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$7,050 $(767)
Fuel1,299 (541)
Purchased power504 (297)
Other operations and maintenance1,769 (166)
Depreciation and amortization1,401 526 
Taxes other than income taxes442 18 
Total operating expenses5,415 (460)
Operating income1,635 (307)
Allowance for equity funds used during construction82 12 
Interest expense, net of amounts capitalized425 43 
Other income (expense), net159 15 
Income taxes81 (342)
Net income1,370 19 
Dividends on preferred stock (11)
Net income after dividends on preferred stock$1,370 $30 
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Operating Revenues
Operating revenues for 2023 were $7.1 billion, reflecting a $767 million, or 9.8%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$6,470 
Estimated change resulting from —
Rates and pricing276 
Sales decline(33)
Weather(84)
Fuel and other cost recovery(470)
Retail — current year$6,159 $6,470 
Wholesale revenues —
Non-affiliates424 726 
Affiliates60 202 
Total wholesale revenues484 928 
Other operating revenues407 419 
Total operating revenues$7,050 $7,817 
Retail revenues decreased $311 million, or 4.8%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The decrease was primarily due to a decrease in fuel and other cost recovery, partially offset by an increase in revenues associated with rates and pricing primarily due to an increase in Rate CNP Compliance revenues and a lower Rate RSE customer refund accrual in 2023 compared to 2022.
See Note 2 to the financial statements under "Alabama Power – Rate ECR," " – Rate RSE," and " – Rate CNP Compliance" for additional information. See "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates include provisions to recognize the recovery of fuel costs, purchased power costs, PPAs certificated by the Alabama PSC, and costs associated with the NDR. Under these provisions, fuel and other cost recovery revenues generally equal fuel and other cost recovery expenses and do not affect net income. See Note 2 to the financial statements under "Alabama Power" for additional information.
Wholesale revenues from sales to non-affiliated utilities were as follows:
20232022
(in millions)
Capacity and other$163 $213 
Energy261 513 
Total non-affiliated$424 $726 
In 2023, wholesale revenues from sales to non-affiliates decreased $302 million, or 41.6%, as compared to 2022. The decrease reflects a 26.0% decrease in the volume of KWHs sold as a result of power sales agreements that ended in May 2023 and a 20.8% decrease in the price of energy primarily as a result of lower natural gas prices.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Alabama Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affect net income. Short-term opportunity energy sales are also included in wholesale energy sales to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Alabama Power's variable cost to produce the energy.
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In 2023, wholesale revenues from sales to affiliates decreased $142 million, or 70.3%, as compared to 2022. The revenue decrease reflects a 47.7% decrease in the price of energy due to lower natural gas prices and a 42.9% decrease in KWH sales due to lower customer demand as a result of milder weather in 2023.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales and purchases are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through Alabama Power's energy cost recovery clause.
In 2023, other operating revenues decreased $12 million, or 2.9%, as compared to 2022 primarily due to decreases of $25 million in cogeneration steam revenue associated with lower natural gas prices and $17 million in rent revenues, partially offset by a $34 million increase in unregulated sales of products and services.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change(*)
(in billions)
Residential17.4 (5.7)%(0.9)%
Commercial12.9 (1.2)0.4 
Industrial20.4 (2.8)(2.8)
Other0.1 (15.5)(15.5)
Total retail50.8 (3.4)(1.3)%
Wholesale
Non-affiliates9.3 (26.0)
Affiliates2.1 (42.9)
Total wholesale11.4 (29.9)
Total energy sales62.2 (9.7)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from the normal temperature conditions. Normal temperature conditions are defined as those experienced in Alabama Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. In 2023, weather-adjusted residential KWH sales decreased 0.9% primarily due to decreased customer usage. Weather-adjusted commercial KWH sales increased 0.4% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 2.8% as a result of a decrease in demand resulting from changes in production levels primarily in the chemicals and forest products sectors.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies related to changes in price and KWH sales.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, Alabama Power purchases a portion of its electricity needs from the wholesale market.
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Details of Alabama Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
54.558.3 
Total purchased power (in billions of KWHs)
10.811.6 
Sources of generation (percent)(a)
Coal35 46 
Gas31 24 
Nuclear27 22 
Hydro7 
Cost of fuel, generated (in cents per net KWH)
Coal3.46 3.39 
Gas(a)
2.99 5.12 
Nuclear0.69 0.67 
Average cost of fuel, generated (in cents per net KWH)(a)
2.50 3.19 
Average cost of purchased power (in cents per net KWH)(b)
4.98 8.00 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by Alabama Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $1.8 billion in 2023, a decrease of $838 million, or 31.7%, compared to 2022. The decrease was primarily due to a $674 million decrease in the average cost of fuel and purchased power and a $164 milliondecrease related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through Alabama Power's energy cost recovery clause. Alabama Power, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 2 to the financial statements under "Alabama Power – Rate ECR" for additional information.
Fuel
Fuel expense was $1.3 billion in 2023, a decrease of $541 million, or 29.4%, compared to 2022. The decrease was primarily due to a 41.6% decrease in the average cost of natural gas per KWH generated, which excludes tolling agreements, and a 29.1% decrease in the volume of KWHs generated by coal, partially offset by a 21.2% increase in the volume of KWHs generated by natural gas, an 18.9% decrease in the volume of KWHs generated by hydro facilities as a result of less rainfall in 2023, and a 13.6% increase in the volume of KWHs generated by nuclear.
Purchased Power Non-Affiliates
Purchased power expense from non-affiliates was $253 million in 2023, a decrease of $188 million, or 42.6%, compared to 2022. The decrease was primarily due to a 32.9% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 25.5% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power Affiliates
Purchased power expense from affiliates was $251 million in 2023, a decrease of $109 million, or 30.3%, compared to 2022. The decrease was primarily due to a 51.4% decrease in the average cost per KWH purchased primarily due to lower natural gas prices, partially offset by a 43.4% increase in the volume of KWHs purchased due to the availability of lower cost gas generation in the Southern Company system.
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Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $166 million, or 8.6%, in 2023 as compared to 2022. The change was primarily due to a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred, as well as decreases of $33 million in transmission and distribution expenses and $21 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $30 million in technology infrastructure and application production costs and $25 million in expenses related to unregulated products and services, as well as a $14 million decrease in nuclear property insurance refunds. See Note 2 to the financial statements under "Alabama Power – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $526 million, or 60.1%, in 2023 as compared to 2022 primarily due to an increase in depreciation rates effective in 2023. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $12 million, or 17.1%, in 2023 as compared to 2022 primarily due to increases in capital expenditures related to hydro production and Plant Barry Unit 8 construction. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $43 million, or 11.3%, in 2023 as compared to 2022. The increase reflects approximately $30 million related to higher average outstanding borrowings and $20 million related to higher interest rates. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $15 million, or 10.4%, in 2023 as compared to 2022 primarily due to a decrease in non-operating benefit-related expenses and an increase in interest income, partially offset by a decrease in non-service cost-related retirement benefits income. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $342 million, or 80.9%, in 2023 as compared to 2022 primarily due to a $252 million increase in the flowback of certain excess deferred income taxes and an $84 million decrease due to lower pre-tax earnings. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" and Note 10to the financial statements for additional information.
Georgia Power
Georgia Power's 2023 net income was $2.1 billion, representing a $0.3 billion, or 14.7%, increase from the previous year. The increase was primarily due to lower non-fuel operations and maintenance costs, revenue reductions in 2022 as a result of Georgia Power exceeding its allowed retail return range, a $187 million decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, and an increase in other revenues, partially offset by a decrease in retail revenues associated with lower contributions from customers with variable demand-driven pricing and milder weather in 2023, as well as higher interest expense. Also contributing to the net income growth were the impacts of the 2022 ARP effective January 1, 2023, including increased retail rates, largely offset by higher depreciation and amortization. See Note 2 to the financial statements under "Georgia Power" for additional information.
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A condensed income statement for Georgia Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$10,118 $(1,466)
Fuel1,781 (705)
Purchased power1,281 (976)
Other operations and maintenance2,083 (266)
Depreciation and amortization1,681 251 
Taxes other than income taxes541 14 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total operating expenses7,299 (1,933)
Operating income2,819 467 
Allowance for equity funds used during construction165 25 
Interest expense, net of amounts capitalized626 141 
Other income (expense), net170 (6)
Income taxes (benefit)448 78 
Net income$2,080 $267 
Operating Revenues
Operating revenues for 2023 were $10.1 billion, reflecting a $1.5 billion, or 12.7%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$10,792 
Estimated change resulting from —
Rates and pricing172 
Sales decline(10)
Weather(141)
Fuel cost recovery(1,591)
Retail — current year$9,222 $10,792 
Wholesale revenues188 235 
Other operating revenues708 557 
Total operating revenues$10,118 $11,584 
Retail revenues decreased $1.6 billion, or 14.5%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing was primarily due to base tariff increases in accordance with the 2022 ARP and revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed retail ROE range, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in revenues recognized under the NCCR tariff. See Note 2 to the financial statements under "Georgia Power – Rate Plans" and " – Nuclear Construction" for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather in 2023.
Electric rates include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses and do not affect net income. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
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Wholesale revenues from power sales were as follows:
20232022
(in millions)
Capacity and other$66 $48 
Energy122 187 
Total$188 $235 
In 2023, wholesale revenues decreased $47 million, or 20.0%, as compared to 2022 largely due to an $81 million decrease related to the average cost per KWH sold due to lower Southern Company system fuel and purchased power costs, partially offset by a $21 million increase related to new capacity contracts and a $13 million increase related to the volume of KWH sales associated with higher market demand.
Wholesale revenues from sales to non-affiliates consist of PPAs and short-term opportunity sales. Wholesale revenues from PPAs have both capacity and energy components. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms and provide for recovery of fixed costs and a return on investment. Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Georgia Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above Georgia Power's variable cost of energy.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues increased $151 million, or 27.1%, as compared to 2022 primarily due to an increase of $105 million in unregulated sales associated with power delivery construction and maintenance, outdoor lighting, and energy conservation projects, a net increase of $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs, an increase of $17 million in retail solar program fees, and a $9 million increase in open access transmission tariff sales.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential27.6 (5.0)%(0.4)%
Commercial32.6 0.1 1.2 
Industrial23.5 (1.6)(1.4)
Other0.4 (4.7)(4.2)
Total retail84.1 (2.1)(0.1)%
Wholesale2.6 7.8 
Total energy sales86.7 (1.9)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Georgia Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. Weather-adjusted residential sales decreased 0.4% primarily due to decreased customer usage, largely offset by customer growth. Weather-adjusted commercial KWH sales increased 1.2% primarily due to customer growth. Weather-adjusted industrial KWH sales decreased
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1.4% primarily due to decreases in the textile, mining, and stone, clay, and glass sectors, partially offset by an increase in the paper sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for Georgia Power. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Georgia Power purchases a portion of its electricity needs from the wholesale market.
Details of Georgia Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
60.359.7 
Total purchased power (in billions of KWHs)
29.633.6 
Sources of generation (percent) —
Gas49 48 
Nuclear(a)
29 27 
Coal19 21 
Hydro and other3 
Cost of fuel, generated (in cents per net KWH)
Gas3.07 5.06 
Nuclear(a)
0.82 0.75 
Coal5.59 4.12 
Average cost of fuel, generated (in cents per net KWH)(a)
2.90 3.64 
Average cost of purchased power (in cents per net KWH)(b)
4.63 7.88 
(a)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(b)Average cost of purchased power includes fuel purchased by Georgia Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $3.1 billion in 2023, a decrease of $1.7 billion, or 35.4%, compared to 2022. The decrease was due to decreases of $1.4 billion related to the average cost of fuel and purchased power and $321 million related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through Georgia Power's fuel cost recovery mechanism. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Fuel
Fuel expense was $1.8 billion in 2023, a decrease of $0.7 billion, or 28.4%, compared to 2022. The decrease was primarily due to decreases of 39.3% in the average cost per KWH generated by natural gas and 8.9% in the volume of KWHs generated by coal, partially offset by increases of 35.7% in the average cost per KWH generated by coal, 9.3% in the average cost per KWH generated by nuclear, 8.5% in the volume of KWHs generated by nuclear, and 2.1% in the volume of KWHs generated by natural gas.
Purchased Power – Non-Affiliates
Purchased power expense from non-affiliates was $517 million in 2023, a decrease of $339 million, or 39.6%, compared to 2022. The decrease was primarily due to a decrease of 33.9% in the volume of KWHs purchased due to lower demand and the availability of lower cost generation in the Southern Company system and a decrease of 22.3% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
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Purchased Power – Affiliates
Purchased power expense from affiliates was $764 million in 2023, a decrease of $637 million, or 45.5%, compared to 2022. The decrease was primarily due to a decrease of 49.1% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $266 million, or 11.3%, in 2023 as compared to 2022. The decrease was primarily due to decreases of $182 million in storm damage recovery as authorized in the 2022 ARP, $178 million in transmission and distribution expenses primarily associated with line maintenance, $74 million in generation non-outage maintenance expenses, and $28 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $60 million from unregulated power delivery construction and maintenance and energy conservation projects, $59 million in generation environmental projects, $55 million in technology infrastructure and application production costs, and $28 million in planned generation outages. See Note 2 to the financial statements under "Georgia Power – Storm Damage Recovery" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $251 million, or 17.6%, in 2023 as compared to 2022 primarily due to increases of $190 million resulting from higher depreciation rates as authorized in the 2022 ARP and $75 million associated with additional plant in service, partially offset by a decrease of $15 million in amortization of regulatory assets related to the retirement of certain generating units that ended in 2022.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $14 million, or 2.7%, in 2023 as compared to 2022 primarily due to an increase of $56 million in property taxes primarily resulting from an increase in the assessed value of property, largely offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $25 million, or 17.9%, in 2023 as compared to 2022 primarily due to an increase in capital expenditures subject to AFUDC.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $141 million, or 29.1%, in 2023 as compared to 2022. The increase primarily reflects approximately $78 million related to higher interest rates and $76 million related to higher average outstanding borrowings, partially offset by the deferral of $14 million in financing costs related to Plant Vogtle Unit 3. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information. Also see Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
Other Income (Expense), Net
Other income (expense), net decreased $6 million, or 3.4%, in 2023 as compared to 2022 primarily due to decreases in non-service cost-related retirement benefits income and customer charges related to contributions in aid of construction, partially offset by a decrease in charitable donations. See Note 11 to the financial statements for additional information on Georgia Power's net periodic pension and other postretirement benefit costs.
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Income Taxes (Benefit)
Income taxes increased $78 million, or 21.1%, in 2023 as compared to 2022 primarily due to the flowback of $145 million of certain excess deferred income taxes that ended in 2022 and higher pre-tax earnings largely resulting from lower charges associated with the construction of Plant Vogtle Units 3 and 4, partially offset by an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards, generation of $35 million of advanced nuclear PTCs, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" and Note 10to the financial statements for additional information.
Mississippi Power
Mississippi Power's net income was $188 million in 2023 compared to $164 million in 2022. The increase was primarily due to an increase in affiliate wholesale capacity revenues, changes in power supply agreements, and a decrease in non-fuel operations and maintenance expenses, partially offset by an increase in interest expense.
A condensed income statement for Mississippi Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$1,474 $(220)
Fuel and purchased power538 (251)
Other operations and maintenance362 (14)
Depreciation and amortization190 9 
Taxes other than income taxes124  
Total operating expenses1,214 (256)
Operating income260 36 
Interest expense, net of amounts capitalized71 15 
Other income (expense), net35 2 
Income taxes36 (1)
Net income$188 $24 
Operating Revenues
Operating revenues for 2023 were $1.5 billion, reflecting a $220 million, or 13.0%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$935 
Estimated change resulting from —
Rates and pricing(11)
Sales growth11 
Weather(4)
Fuel and other cost recovery32 
Retail — current year$963 $935 
Wholesale revenues —
Non-affiliates272 252 
Affiliates200 460 
Total wholesale revenues472 712 
Other operating revenues39 47 
Total operating revenues$1,474 $1,694 
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Total retail revenues for 2023 increased $28 million, or 3.0%, compared to 2022 primarily due to higher recoverable fuel costs and an increase in customer usage, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and lower revenues associated with a tolling arrangement accounted for as a sales-type lease. See Notes 2 and 9 to the financial statements under "Mississippi Power" and "Lessor," respectively, for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates for Mississippi Power include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not affect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside Mississippi Power's service territory. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" for additional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
20232022
(in millions)
Capacity and other$21 $
Energy251 249 
Total non-affiliated$272 $252 
Wholesale revenues from sales to non-affiliates increased $20 million, or 7.9%, compared to 2022. The increase was primarily due to capacity revenues associated with new capacity contracts in 2023.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Mississippi Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. In addition, Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023. Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Mississippi Power's variable cost to produce the energy. See Note 2 under "Mississippi Power – Municipal and Rural Associations Tariff" for additional information.
Wholesale revenues from sales to affiliates decreased $260 million, or 56.5%, in 2023 compared to 2022. The decrease was primarily due to a $293 million decrease associated with lower natural gas prices, partially offset by a $23 million increase in capacity revenues resulting from availability of generation reserves and an increase in pricing and a $10 million increase associated with higher KWH sales.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. The energy portion of these transactions does not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues decreased $8 million, or 17.0%, as compared to 2022 primarily due to decreases of $5 million in unregulated sales associated with power delivery construction and maintenance projects and $3 million in open access transmission tariff revenues.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted Percent Change(*)
(in millions)
Residential2,092 (1.9)%0.7 %
Commercial2,815 7.0 7.1 
Industrial4,721 0.7 0.7 
Other28 (11.1)(11.1)
Total retail9,656 1.8 %2.5 %
Wholesale
Non-affiliated3,836 10.7 
Affiliated5,612 2.2 
Total wholesale9,448 5.5 
Total energy sales19,104 3.6 %
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Mississippi Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales increased in 2023 when compared to 2022. Weather-adjusted residential KWH sales increased 0.7% due to an increase in customer usage. Weather-adjusted commercial KWH sales increased 7.1% primarily due to customer growth. Industrial KWH sales increased 0.7% primarily due to an increase in the non-manufacturing sector, partially offset by a decrease in the chemicals sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Mississippi Power purchases a portion of its electricity needs from the wholesale market.
Details of Mississippi Power's generation and purchased power were as follows:
20232022
Total generation (in millions of KWHs)
18,789 18,303 
Total purchased power (in millions of KWHs)
524 617 
Sources of generation (percent) –
Gas92 90 
Coal8 10 
Cost of fuel, generated (in cents per net KWH) –
Gas2.68 4.34 
Coal5.46 4.13 
Average cost of fuel, generated (in cents per net KWH)
2.90 4.31 
Average cost of purchased power (in cents per net KWH)
4.27 6.91 
Fuel and purchased power expenses were $538 million in 2023, a decrease of $251 million, or 31.8%, as compared to 2022. The decrease was primarily due to a $266 million decrease related to the average cost of fuel and purchased power, partially offset by a $15 million net increase related to the volume of KWHs generated and purchased.
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Fuel and purchased power energy transactions do not have a significant impact on earnings since energy expenses are generally offset by energy revenues through Mississippi Power's fuel cost recovery clauses. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" and Note 1 to the financial statements under "Fuel Costs" for additional information.
Fuel expense decreased $230 million, or 30.8%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost of natural gas per KWH generated and a 20.3% decrease in the volume of KWHs generated by coal, partially offset by a 32.2% increase in the average cost of coal per KWHs generated and a 5.4% increase in the volume of KWHs generated by natural gas.
Purchased power expense decreased $21 million, or 49.9%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 15.1% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $14 million, or 3.7%, in 2023 compared to 2022. The decrease was primarily due to decreases of $14 million in reliability reserve accruals, $7 million in generation expenses, and $6 million in unregulated power delivery construction and maintenance projects, partially offset by increases of $5 million in storm reserve accruals and $2 million in certain employee compensation and benefit expenses. See Note 2 to the financial statements under "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $9 million, or 5.0%, in 2023 compared to 2022 primarily due to an increase in depreciation associated with additional plant in service.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $15 million, or 26.8%, in 2023 compared to 2022. The increase was primarily due to increases of approximately $10 million related to higher interest rates and $5 million related to higher average outstanding borrowings. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information.
Income Taxes
Income taxes decreased $1 million, or 2.7%, in 2023 compared to 2022 primarily due to a decrease of $7 million associated with the flowback of certain excess deferred income taxes associated with new PEP rates that became effective in April 2023, largely offset by an increase of $6 million associated with higher pre-tax earnings. See Note 2 to the financial statements under "Mississippi Power – Performance Evaluation Plan" and Note 10 to the financial statements for additional information.
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Southern Power
Net income attributable to Southern Power for 2023 was $357 million, a $3 million increase from 2022. The increase was primarily due to higher HLBV income associated with tax equity partnerships, an arbitration award received for losses previously incurred, a gain on the sale of spare parts, and receipts of liquidated damages and insurance proceeds related to generation facility production and equipment, as well as changes in state apportionment methodology related to tax legislation enacted by the State of Tennessee. These increases were largely offset by lower revenues driven by lower market prices of energy.
A condensed statement of income follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$2,189 $(1,180)
Fuel706 (908)
Purchased power116 (195)
Other operations and maintenance473 (9)
Depreciation and amortization504 (12)
Taxes other than income taxes51 2 
Loss on sales-type leases (1)
Gain on dispositions, net(20)(18)
Total operating expenses1,830 (1,141)
Operating income359 (39)
Interest expense, net of amounts capitalized129 (9)
Other income (expense), net12 5 
Income taxes (benefit)12 (8)
Net income230 (17)
Net loss attributable to noncontrolling interests(127)(20)
Net income attributable to Southern Power$357 $3 
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company power pool.
Natural Gas Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to operating income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of Southern Power's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have capacity revenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy generated from the respective facility and sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.
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See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.
Operating Revenues Details
Details of Southern Power's operating revenues were as follows:
20232022
(in millions)
PPA capacity revenues$471 $451 
PPA energy revenues1,227 2,121 
Total PPA revenues1,698 2,572 
Non-PPA revenues436 761 
Other revenues55 36 
Total operating revenues$2,189 $3,369 
Operating revenues for 2023 were $2.2 billion, a $1.2 billion, or 35.0% decrease from 2022. The change in operating revenues was primarily due to the following:
PPA capacity revenuesincreased $20 million, or 4.4%, primarily due to an increase associated with a change in rates from new and existing natural gas PPAs.
PPA energy revenues decreased $894 million, or 42.1%, primarily due to a $904 million decrease in sales under natural gas PPAs resulting from a $726 million decrease in the price of fuel and purchased power and a $178 million decrease in the volume of KWHs sold.
Non-PPA revenues decreased $325 million, or 42.7%, primarily due to a $650 million decrease in the market price of energy, partially offset by a $321 million increase in the volume of KWHs sold through short-term sales.
Other revenues increased $19 million, or 52.8%, primarily due to receipts of liquidated damages associated with generation facility production guarantees, an arbitration award received for losses previously incurred, and business interruption insurance proceeds for damaged generation equipment. See Note 3 to the financial statements under "General Litigation Matters – Southern Power" for additional information.
Fuel and Purchased Power Expenses
Details of Southern Power's generation and purchased power were as follows:
Total
KWHs
Total KWH % ChangeTotal
KWHs
20232022
(in billions of KWHs)
Generation4948
Purchased power33
Total generation and purchased power522.0%51
Total generation and purchased power (excluding solar, wind, fuel cells, and tolling agreements)
336.5%31
Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
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Details of Southern Power's fuel and purchased power expenses were as follows:
20232022
(in millions)
Fuel$706 $1,614 
Purchased power116 311 
Total fuel and purchased power expenses$822 $1,925 
In 2023, total fuel and purchased power expenses decreased $1.1 billion, or 57.3%, compared to 2022. Fuel expensedecreased $908 million, or 56.3%, primarily due to a $1.0 billion decrease associated with the average cost of fuel. Purchased power expense decreased $195 million, or 62.7%, primarily due to a $206 million decrease associated with the average cost of purchased power.
Gain on Dispositions, Net
In 2023, gain on dispositions, net increased $18 million compared to 2022 primarily due to a $16 million gain on the sale of spare parts in 2023.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized decreased $9 million, or 6.5%, compared to 2022. The decrease was primarily due to lower average outstanding borrowings.
Income Taxes (Benefit)
In 2023, income taxes decreased $8 million, or 40.0%, compared to 2022. The decrease was primarily due to a change in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in the second quarter 2023. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate," respectively, for additional information.
Net Loss Attributable to Noncontrolling Interests
In 2023, net loss attributable to noncontrolling interests increased $20 million, or 18.7%, compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to wind tax equity partners and $5 million in lower income allocations to equity partners, partially offset by $10 million in lower HLBV loss allocations to battery energy storage partners.
Southern Company Gas
Southern Company Gas has various regulatory mechanisms, such as weather and revenue normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of its utility's respective service territory. Southern Company Gas also utilizes weather hedges to limit the negative income impacts in the event of warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. Therefore, weather typically does not have a significant net income impact.
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas and bad debt expense, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing Southern Company Gas' annual results. Thus, Southern Company Gas' operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
Percent Generated During
Heating Season
Operating RevenuesNet
Income
202367 %73 %
202267 %66 %
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Net Income
Net income attributable to Southern Company Gas in 2023 was $615 million, an increase of $43 million, or 7.5%, compared to 2022. Net income increased primarily as a result of an impairment charge in 2022 related to the sale of natural gas storage facilities. The increase in net income was partially offset by a decrease of $29 million in net income at gas distribution operations primarily as a result of reduced revenue due to lower volumes sold, regulatory disallowances at Nicor Gas, and higher depreciation related to continued investment in infrastructure replacement programs, partially offset by lower cost of gas, and a $9 million decrease in net income at gas pipeline investments primarily as a result of higher expenses at SNG.
A condensed income statement for Southern Company Gas follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Earnings before income taxes826 74 
Income taxes211 31 
Net Income$615 $43 
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from
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customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Customer Count
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas distribution operations' and gas marketing services' customers are primarily located in Georgia and Illinois.
The following table provides the number of customers served by Southern Company Gas at December 31, 2023 and 2022:
20232022
(in thousands, except market share %)
Gas distribution operations4,374 4,358 
Gas marketing services
Energy customers665 622 
Market share of energy customers in Georgia30.0 %29.3 %
Southern Company Gas anticipates customer growth and uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at gas distribution operations represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
In 2023, cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
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Volumes of Natural Gas Sold
Southern Company Gas' natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas.
The following table details the volumes of natural gas sold during all periods presented:
2023 vs. 2022
20232022% Change
Gas distribution operations (mmBtu in millions)
Firm625 707 (11.6)%
Interruptible93 93  
Total718 800 (10.3)%
Gas marketing services (mmBtu in millions)
Firm:
Georgia33 35 (5.7)%
Other19 18 5.6 
Interruptible large commercial and industrial14 14  
Total66 67 (1.5)%
Other Operations and Maintenance Expenses
In 2023, other operations and maintenance expenses increased $18 million, or 1.5%, compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Depreciation and Amortization
In 2023, depreciation and amortization increased $23 million, or 4.1%, compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
In 2023, taxes other than income taxes decreased $20 million, or 7.1%, compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized increased $47 million, or 17.9%, compared to 2022. The increase reflects $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
In 2023, income taxes increased $31 million, or 17.2%, compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes
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related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Segment Information
20232022
Operating RevenuesOperating ExpensesNet Income (Loss)Operating RevenuesOperating ExpensesNet Income (Loss)
(in millions)(in millions)
Gas distribution operations$4,105 $3,301 $441 $5,267 $4,464 $470 
Gas pipeline investments32 10 98 32 11 107 
Gas marketing services548 418 91 638 505 94 
All other36 40 (15)55 190 (99)
Intercompany eliminations(19)(6) (30)(22)— 
Consolidated$4,702 $3,763 $615 $5,962 $5,148 $572 
Gas Distribution Operations
Gas distribution operations is the largest component of Southern Company Gas' business and is subject to regulation and oversight by regulatory agencies in each of the states it serves. These agencies approve natural gas rates designed to provide Southern Company Gas with the opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest expense, operations and maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, Southern Company Gas' second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. Southern Company Gas has various regulatory and other mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit its exposure to changes in customer consumption, including weather changes within typical ranges in its natural gas distribution utilities' service territories. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income decreased $29 million, or 6.2%, compared to 2022. Operating revenues decreased $1.2 billion primarily due to lower gas cost recovery and lower volumes sold, partially offset by rate increases and continued investment in infrastructure replacement. Gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas. Operating expenses decreased $1.2 billion primarily due to a $1.3 billion decrease in the cost of natural gas as a result of lower gas prices compared to 2022 and lower taxes other than income taxes, partially offset by $88 million related to the regulatory disallowances at Nicor Gas, higher depreciation resulting from additional assets placed in service, higher compensation and benefits expenses, and a $20 million increase related to energy service contracts. The decrease in operating expenses also includes costs passed through directly to customers, primarily related to bad debt expenses, energy efficiency programs, and revenue taxes. The decrease in net income also includes an increase of $46 million in interest expense, net of amounts capitalized primarily due to higher interest rates and higher average outstanding debt, partially offset by a $19 million decrease in income taxes primarily as a result of the tax benefit resulting from the regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Gas Pipeline Investments
Gas pipeline investments consists primarily of joint ventures in natural gas pipeline investments including SNG and Dalton Pipeline. In 2023, net income decreased $9 million compared to 2022. The decrease was primarily due to lower earnings at SNG resulting from higher expenses. See Note 7 to the financial statements under "Southern Company Gas" for additional information.
Gas Marketing Services
Gas marketing services provides energy-related products and services to natural gas markets and participants in customer choice programs that were approved in various states to increase competition. These programs allow customers to choose their natural gas supplier while the local distribution utility continues to provide distribution and transportation services. Gas marketing
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services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts.
In 2023, net income decreased $3 million, or 3.2%, compared to 2022. The decrease was due to a $90 million decrease in operating revenues primarily due to lower gas prices and the timing of unrealized hedge losses, largely offset by an $87 million decrease in operating expenses primarily related to a $106 million decrease in cost of gas, partially offset by higher compensation and benefits.
All Other
All other includes natural gas storage businesses, a renewable natural gas business, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the reportable segments and interest income (expense) associated with affiliate financing arrangements. All other included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income increased $84 million compared to 2022. The increase was primarily due to a decrease in operating expenses primarily related to pre-tax impairment charges in 2022 totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities, lower depreciation, lower cost of gas, and lower taxes other than income taxes, partially offset by a decrease in operating revenues of $19 million and an increase in income taxes. See Note 10 to the financial statements and Note 15 to the financial statements under "Southern Company Gas"for additional information.
FUTURE EARNINGS POTENTIAL
General
Prices for electric service provided by the traditional electric operating companies and natural gas distribution service provided by the natural gas distribution utilities to retail customers are set by state PSCs or other applicable state regulatory agencies under cost-based regulatory principles. Retail rates and earnings are reviewed through various regulatory mechanisms and/or processes and may be adjusted periodically within certain limitations. Effectively operating pursuant to these regulatory mechanisms and/or processes and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the traditional electric operating companies and natural gas distribution utilities for the foreseeable future. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Southern Power continues to focus on long-term PPAs. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 2 to the financial statements for additional information about regulatory matters.
Each Registrant's results of operations are not necessarily indicative of its future earnings potential. The level of the Registrants' future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Registrants' primary businesses of selling electricity and/or distributing natural gas, as described further herein.
For the traditional electric operating companies, these factors include the ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs during a time of increasing costs, including those related to projected long-term demand growth, stringent environmental standards, including CCR rules, safety, system reliability and resiliency, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants and expanding and improving the transmission and distribution systems; continued customer growth; and the trends of higher inflation and reduced electricity usage per customer, especially in residential and commercial markets. For Georgia Power, other major factors are completing construction and start-up of Plant Vogtle Unit 4 and meeting the related cost and schedule projections.
Earnings in the electricity business will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, which could contribute to a net reduction in customer usage.
Global and U.S. economic conditions continue to be affected by higher-than-expected inflation that arose from the COVID-19 pandemic and associated policy responses of governments and central banks. In response to elevated inflation levels, the U.S. Federal Reserve raised interest rates faster than any rate increase cycle in the last 40 years. The actions by the U.S. Federal Reserve have helped to slow the rate of inflation and curtail economic activity. Although target levels of inflation have yet to be achieved, the U.S. Federal Reserve has indicated its current intention to pause future rate increases and evaluate rate cuts in the near term. The shifting economic policy variables and weakening of historic relationships among economic activity, prices, and employment have increased the uncertainty of future levels of economic activity, which will directly impact future energy demand and operating costs. Weakening economic activity increases the risk of slowing or declining energy sales. See RESULTS OF OPERATIONS herein for information on energy sales in the Southern Company system's service territory during 2023.
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The level of future earnings for Southern Power's competitive wholesale electric business depends on numerous factors including the parameters of the wholesale market and the efficient operation of its wholesale generating assets; Southern Power's ability to execute its growth strategy through the development, construction, or acquisition of renewable facilities and other energy projects while containing costs; regulatory matters; customer creditworthiness; total electric generating capacity available in Southern Power's market areas; Southern Power's ability to successfully remarket capacity as current contracts expire; renewable portfolio standards; continued availability of federal and state ITCs and PTCs, which could be impacted by future tax legislation; transmission constraints; cost of generation from units within the Southern Company power pool; and operational limitations. See "Income Tax Matters" herein for information regarding the IRA's expansion of the availability of federal ITCs and PTCs. Also see Notes 10 and 15 to the financial statements for additional information.
The level of future earnings for Southern Company Gas' primary business of distributing natural gas and its complementary businesses in the gas pipeline investments and gas marketing services sectors depends on numerous factors. These factors include the natural gas distribution utilities' ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs, including those related to projected long-term demand growth, safety, system reliability and resiliency, natural gas, and capital expenditures, including expanding and improving the natural gas distribution systems; the completion and subsequent operation of ongoing infrastructure and other construction projects; customer creditworthiness; and certain policies to limit the use of natural gas, such as the potential in Illinois and across certain other parts of the U.S. for state or municipal bans on the use of natural gas or policies designed to promote electrification. The volatility of natural gas prices has an impact on Southern Company Gas' customer rates, its long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services business to capture value from locational and seasonal spreads. Additionally, changes in commodity prices, primarily driven by tight gas supplies, geopolitical events, and diminished gas production, subject a portion of Southern Company Gas' operations to earnings variability and may result in higher natural gas prices. Additional economic factors may contribute to this environment. The demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis. Alternatively, a significant drop in oil and natural gas prices could lead to a consolidation of natural gas producers or reduced levels of natural gas production.
Earnings for both the electricity and natural gas businesses are subject to a variety of other factors. These factors include weather; competition; developing new and maintaining existing energy contracts and associated load requirements with wholesale customers; customer energy conservation practices; the use of alternative energy sources by customers; government incentives to reduce overall energy usage; fuel, labor, and material prices in an environment of heightened inflation and material and labor supply chain disruptions; and the price elasticity of demand. Demand for electricity and natural gas in the Registrants' service territories is primarily driven by the pace of economic growth or decline that may be affected by changes in regional and global economic conditions, which may impact future earnings.
Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023.
As part of its ongoing effort to adapt to changing market conditions, Southern Company continues to evaluate and consider a wide array of potential business strategies. These strategies may include business combinations, partnerships, and acquisitions involving other utility or non-utility businesses or properties, disposition of, or the sale of interests in, certain assets or businesses, internal restructuring, or some combination thereof. Furthermore, Southern Company may engage in new business ventures that arise from competitive and regulatory changes in the utility industry. Pursuit of any of the above strategies, or any combination thereof, may significantly affect the business operations, risks, and financial condition of Southern Company. In addition, Southern Power and Southern Company Gas regularly consider and evaluate joint development arrangements as well as acquisitions and dispositions of businesses and assets as part of their business strategies. See Note 15 to the financial statements for additional information.
Environmental Matters
The Southern Company system's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, avian and other wildlife and habitat protection, and other natural resources. The Southern Company system maintains comprehensive environmental compliance and GHG strategies to assess both current and upcoming requirements and compliance costs associated with these environmental laws and regulations. New or revised environmental laws and regulations could further affect many areas of operations for the Subsidiary Registrants. The costs required to comply with environmental laws and regulations and to achieve stated goals, including capital expenditures, operations and maintenance costs, and costs reflected in ARO liabilities, may impact future electric generating unit retirement and replacement decisions (which are generally subject to approval from the traditional electric operating companies' respective state PSCs), results of operations, cash flows, and/or financial condition. Related costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, or changing fuel sources for certain existing
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units, as well as related upgrades to the Southern Company system's transmission and distribution (electric and natural gas) systems. A major portion of these costs is expected to be recovered through retail and wholesale rates, including existing ratemaking and billing provisions. The ultimate impact of environmental laws and regulations and the GHG goals discussed herein cannot be determined at this time and will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed technology, fuel prices, the outcome of pending and/or future legal challenges and regulatory matters, and the ability to continue recovering the related costs, through rates for the traditional electric operating companies and the natural gas distribution utilities and/or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.
Alabama Power and Mississippi Power recover environmental compliance costs through separate mechanisms, Rate CNP Compliance and the ECO Plan, respectively. Georgia Power's base rates include an ECCR tariff that allows for the recovery of environmental compliance costs. The natural gas distribution utilities of Southern Company Gas generally recover environmental remediation expenditures through rate mechanisms approved by their applicable state regulatory agencies. See Notes 2 and 3 to the financial statements for additional information.
Southern Power's PPAs generally contain provisions that permit charging the counterparty for some of the new costs incurred as a result of changes in environmental laws and regulations. Since Southern Power's units are generally newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and/or operating any type of existing or future facility. The impact of such laws, regulations, and other considerations on Southern Power and subsequent recovery through PPA provisions cannot be determined at this time.
Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity and natural gas, which could negatively affect results of operations, cash flows, and/or financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which may have the potential to affect their demand for electricity and natural gas.
Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, estimated capital expenditures through 2028 based on the current environmental compliance strategy for the Southern Company system and the traditional electric operating companies are as follows:
20242025202620272028Total
(in millions)
Southern Company$150 $141 $112 $92 $30 $525 
Alabama Power45 47 40 35 19 186 
Georgia Power92 80 60 32 10 274 
Mississippi Power13 13 12 26 65 
These estimates do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See "Environmental Laws and Regulations– Greenhouse Gases" and "– Water Quality" herein for additional information. The Southern Company system also anticipates substantial expenditures associated with ash pond closure and groundwater monitoring under the CCR Rule and related state rules, which are reflected in the applicable Registrants' ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein and Note 6 to the financial statements for additional information.
Environmental Laws and Regulations
Air Quality
Since 1990, the Southern Company system reduced SO2 and NOX air emissions by 99% and 92%, respectively, through 2022. Since 2005, the Southern Company system reduced mercury air emissions by 97% through 2022.
On February 13, 2023, the EPA published a final rule disapproving 19 state implementation plans (SIPs), including the States of Alabama and Mississippi, under the interstate transport (good neighbor) provisions of the Clean Air Act for the 2015 Ozone National Ambient Air Quality Standards (NAAQS). On March 14, 2023 and March 15, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the EPA's disapproval of the Mississippi SIP in the U.S. Court of Appeals for the
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Fifth Circuit. On June 8, 2023, the U.S. Court of Appeals for the Fifth Circuit stayed the EPA's disapproval of the Mississippi SIP, pending appeal. On April 13, 2023 and April 14, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the EPA's disapproval of the Alabama SIP in the U.S. Court of Appeals for the Eleventh Circuit. On August 17, 2023, the U.S. Court of Appeals for the Eleventh Circuit stayed the EPA's disapproval of the Alabama SIP, pending appeal.
On June 5, 2023, the EPA published the 2015 Ozone NAAQS Good Neighbor federal implementation plan (FIP), which requires reductions in NOX emissions from sources in 23 states, including Alabama and Mississippi, to assure those states satisfy their Clean Air Act good neighbor obligations for the 2015 Ozone NAAQS. Georgia and North Carolina have approved interstate transport SIPs addressing the 2015 Ozone NAAQS and are not subject to this rule. On June 16, 2023 and June 27, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the FIP for Mississippi in the U.S. Court of Appeals for the Fifth Circuit. On August 4, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the FIP for Alabama in the U.S. Court of Appeals for the Eleventh Circuit. Both cases are being held in abeyance pending resolution of the Mississippi SIP disapproval and Alabama SIP disapproval cases, respectively.
In July and September 2023, the EPA published an Interim Final Rule and an updated Interim Final Rule that stays the implementation of the FIPs for states with judicially stayed SIP disapprovals, including Mississippi and Alabama, respectively. The Interim Final Rule revises the existing regulations to maintain currently applicable trading programs for those states.
The ultimate impact of the rule and associated legal matters cannot be determined at this time; however, implementation of the FIPs will likely result in increased compliance costs for the traditional electric operating companies.
Water Quality
In 2020, the EPA published the final steam electric ELG reconsideration rule (ELG Reconsideration Rule), a reconsideration of the 2015 ELG rule's limits on bottom ash transport water and flue gas desulfurization wastewater that extended the latest applicability date for both discharges to December 31, 2025. The ELG Reconsideration Rule also updated the voluntary incentive program and provided new subcategories for low utilization electric generating units and electric generating units that will permanently cease coal combustion by 2028. On March 29, 2023, the EPA published a proposed ELG Supplemental Rule revising certain effluent limits of the 2020 and 2015 ELG rules. The proposal imposes more stringent requirements for flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate to be met no later than December 31, 2029. The EPA is also proposing that a limited number of facilities already achieving compliance with the 2020 ELG Reconsideration Rule be allowed to elect retirement or repowering by December 31, 2032 as opposed to meeting the new more stringent requirements. The proposal maintains the 2020 ELG Reconsideration Rule's permanent cessation of coal combustion subcategory allowing units to continue to operate until the end of 2028 without having to install additional technologies. The proposal also maintains the Voluntary Incentive Program (VIP) subcategory, which allows units to comply with VIP limits by December 31, 2028. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
As required by the ELG Reconsideration Rule, in 2021, Alabama Power and Georgia Power each submitted initial notices of planned participation (NOPP) for applicable units seeking to qualify for these cessation of coal combustion or VIP subcategories that require compliance by December 31, 2028.
Alabama Power submitted its NOPP to the Alabama Department of Environmental Management (ADEM) indicating plans to retire Plant Barry Unit 5 (700 MWs) and to cease using coal and begin operating solely on natural gas at Plant Barry Unit 4 (350 MWs) and Plant Gaston Unit 5 (880 MWs). Alabama Power, as agent for SEGCO, indicated plans to retire Plant Gaston Units 1 through 4 (1,000 MWs). However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. The NOPP submittals are subject to the review of the ADEM. Plant Barry Unit 4 ceased using coal and began to operate solely on natural gas in December 2022. See Notes 2 and 7 to the financial statements under "Georgia Power – Integrated Resource Plans" and "SEGCO," respectively, for additional information.
The remaining assets for which Alabama Power has indicated retirement, due to early closure or repowering of the unit to natural gas, have net book values totaling approximately $1.2 billion (excluding capitalized asset retirement costs which are recovered through Rate CNP Compliance) at December 31, 2023. Based on an Alabama PSC order, Alabama Power is authorized to establish a regulatory asset to record the unrecovered investment costs, including the plant asset balance and the site removal and closure costs, associated with unit retirements caused by environmental regulations (Environmental Accounting Order). Under the Environmental Accounting Order, the regulatory asset would be amortized and recovered over an affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance. See Note 2 to the financial statements under "Alabama Power – Rate CNP Compliance" and " – Environmental Accounting Order" for additional information.
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Georgia Power submitted its NOPP to the Georgia Environmental Protection Division (EPD) indicating plans to retire Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership), which occurred in August 2022, Plant Bowen Units 1 and 2 (1,400 MWs), and Plant Scherer Unit 3 (614 MWs based on 75% ownership) on or before the compliance date of December 31, 2028. Georgia Power also submitted a NOPP indicating plans to pursue compliance with the ELG Reconsideration Rule for Plant Scherer Units 1 and 2 (137 MWs based on 8.4% ownership) through the voluntary incentive program by no later than December 31, 2028. Georgia Power intends to comply with the ELG Rules for Plant Bowen Units 3 and 4 through the generally applicable requirements by December 31, 2025; therefore, no NOPP submission was required for these units. The NOPP submittals and generally applicable requirements are subject to the review of the Georgia EPD and decisions related to retirement or continued operation of units are subject to Georgia PSC approval. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the management and disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (ash ponds) at active electric generating power plants. The CCR Rule requires landfills and ash ponds to be evaluated against a set of performance criteria and potentially closed if certain criteria are not met. Closure of existing landfills and ash ponds requires installation of equipment and infrastructure to manage CCR in accordance with the CCR Rule. In addition to the federal CCR Rule, the States of Alabama and Georgia finalized state regulations regarding the management and disposal of CCR within their respective states. In 2019, the State of Georgia received partial approval from the EPA for its state CCR permitting program, which has broader applicability than the federal rule. The State of Mississippi has not developed a state CCR permit program.
On August 14, 2023, the EPA published a proposal to deny the ADEM's CCR permit program application. Alabama Power's permits to close its CCR facilities remain valid under state law. In the absence of an EPA-approved state permit program, CCR facilities in Alabama will remain subject to both the federal and state CCR rules.
The Holistic Approach to Closure: Part A rule, finalized in 2020, revised the deadline to stop sending CCR and non-CCR wastes to unlined surface impoundments to April 11, 2021 and established a process for the EPA to approve extensions to the deadline. The traditional electric operating companies stopped sending CCR and non-CCR wastes to their unlined impoundments prior to April 11, 2021 and, therefore, did not submit requests for extensions. Beginning in January 2022, the EPA issued numerous Part A determinations that state its current positions on a variety of CCR Rule compliance requirements, such as criteria for groundwater corrective action and CCR unit closure. The traditional electric operating companies are working with state regulatory agencies to determine whether the EPA's current positions may impact closure and groundwater monitoring plans.
In April 2022, the Utilities Solid Waste Activities Group and a group of generating facility operators filed petitions for review in the U.S. Court of Appeals for the D.C. Circuit challenging whether the EPA's January 2022 actions establish new legislative rules that should have gone through notice-and-comment rulemaking. A decision by the court is expected in 2024. The ultimate impacts of the EPA's current positions are subject to the outcome of the pending litigation and any potential future rulemaking and cannot be determined at this time.
On May 18, 2023, the EPA published a proposed rule to establish two new categories of federally regulated CCR, legacy surface impoundments and CCR management units (CCRMUs). The proposal establishes accelerated compliance deadlines for legacy surface impoundments to meet regulatory requirements, including a requirement to initiate closure within 12 months after the effective date of the final rule. The EPA is also proposing a definition for CCRMUs. The EPA's proposal would also require facility evaluations to be completed at both active facilities and inactive facilities with one or more legacy surface impoundment to determine the presence or absence of CCRMUs. CCRMUs must comply with the CCR Rule's provisions for groundwater monitoring, corrective action, closure, and post-closure activities. On November 14, 2023, the EPA published a Notice of Data Availability supplementing the proposed rule, which sought comment on new data and a supplemental risk assessment that could be used to support final rulemaking. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
Based on requirements for closure and monitoring of landfills and ash ponds pursuant to the CCR Rule and applicable state rules, the traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to closure methodologies, schedules, and/or costs becomes available. Some of these updates have been, and future updates may be, material. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and the traditional electric operating companies could be materially impacted. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements," Notes 2 and 3 to the financial statements under "Georgia Power – Rate Plans" and "General Litigation Matters – Alabama Power," respectively, and Note 6 to the financial statements for additional information.
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Greenhouse Gases
On May 23, 2023, the EPA published proposed GHG standards and state plan guidelines for fossil fuel-fired power plants, which would require GHG limits for subcategories of both new and existing units based on technologies such as carbon capture and sequestration, low-GHG hydrogen co-firing, and natural gas co-firing. The proposed standards for new combustion turbines include subcategories for different operational uses including peaking, intermediate, and base load. Compliance with new source standards, once finalized, begins when the unit comes online. The proposed state plan guidelines for existing units include subcategories based on unit type, retirement date, size, and capacity factor. The EPA is proposing a 24-month state plan submission deadline for the existing unit implementation and may allow states to implement some limited form of trading and averaging for the state plans. Existing source compliance is proposed to begin as early as January 1, 2030, depending on the unit type and subcategory. The EPA also proposes to simultaneously repeal the Affordable Clean Energy rule. On November 17, 2023, the EPA published a final rule updating the regulations governing the processes and timelines for state and federal plans to implement existing source GHG performance standards. While this rule establishes the general requirements and timelines for states to follow in implementing the EPA's emissions guidelines, the pending final rule for GHG emissions from fossil fuel-fired power plants is expected to include schedules and other implementation requirements that will supersede these general provisions. On November 20, 2023, the EPA published a Supplemental Notice of Proposed Rulemaking for the pending rules for fossil fuel-fired power plants requesting additional input on how the EPA should address reliability concerns in the final rules. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
In 2021, the United States officially rejoined the Paris Agreement. The Paris Agreement establishes a non-binding universal framework for addressing GHG emissions based on nationally determined emissions reduction contributions and sets in place a process for tracking progress towards the goals every five years. In 2021, President Biden announced a new target for the United States to achieve a 50% to 52% reduction in economy-wide GHG emissions from 2005 levels by 2030. The target was accepted by the United Nations as the United States' nationally determined emissions reduction contribution under the Paris Agreement.
Additional GHG policies, including legislation, may emerge in the future requiring the United States to accelerate its transition to a lower GHG emitting economy; however, associated impacts are currently unknown. The Southern Company system has transitioned from an electric generating mix of 70% coal and 15% natural gas in 2007 to a mix of 17% coal and 54% natural gas in 2023. This transition has been supported in part by the Southern Company system retiring over 6,700 MWs of coal-fired generating capacity since 2010 and converting 3,700 MWs of generating capacity from coal to natural gas since 2015. In addition, the Southern Company system's capacity mix consists of over 11,600 MWs of renewable and storage facilities through ownership and long-term PPAs. See "Environmental Laws and Regulations – Water Quality" hereinfor information on plans to retire or convert to natural gas additional coal-fired generating capacity. In addition, Southern Company Gas has replaced over 6,000 miles of pipe material that was more prone to fugitive emissions (unprotected steel and cast-iron pipe), resulting in mitigation of more than 3.3 million metric tons of CO2 equivalents from its natural gas distribution system since 1998.
The following table provides the Registrants' 2022 and preliminary 2023 Scope 1 GHG emissions based on equity share of facilities:
2022Preliminary 2023
(in million metric tons of CO2 equivalent)
Southern Company(*)
8580
Alabama Power(*)
3528
Georgia Power2324
Mississippi Power99
Southern Power1313
Southern Company Gas(*)
22
(*)Includes GHG emissions attributable to disposed assets through the date of the applicable disposition and to acquired assets beginning with the date of the applicable acquisition. See Note 15 to the financial statements for additional information.
Southern Company system management has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Based on the preliminary 2023 emissions, the Southern Company system has achieved an estimated GHG emission reduction of 49% since 2007. GHG emissions decreased in 2023 when compared to 2022 as coal generation was displaced by lower carbon generation, including from Plant Vogtle Unit 3, as discussed further under RESULTS OF OPERATIONS – "Southern Company – Electricity Business" herein. Southern Company system management expects to achieve GHG reductions of greater than 50% as early as 2025, five years earlier than the established interim goal, and remain close to 50% through the late 2020s, followed thereafter by continued reductions. While none
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of Southern Company's subsidiaries are currently subject to renewable portfolio standards or similar requirements, management of the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. Southern Company system management plans to continue to pursue a diverse portfolio including low-carbon and carbon-free resources and energy efficiency resources; continue to transition the Southern Company system's generating fleet and make the necessary related investments in transmission and distribution systems; implement initiatives to reduce natural gas distribution operational emissions; continue its research and development with a particular focus on technologies that lower GHG emissions, including methods of removing carbon from the atmosphere; and constructively engage with policymakers, regulators, investors, customers, and other stakeholders to support outcomes leading to a net zero future.
Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and Southern Company Gas conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in their financial statements. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia (which represent substantially all of Southern Company Gas' accrued remediation costs) have all received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies. The traditional electric operating companies and Southern Company Gas may be liable for some or all required cleanup costs for additional sites that may require environmental remediation. See Note 3 to the financial statements under "Environmental Remediation" for additional information.
Regulatory MattersBusiness Activities
In 2009, the Georgia PSC voted to certify construction of Plant Vogtle Units 3 and 4 with a certified capital cost of $4.418 billion. In addition, in 2009 the Georgia PSC approved inclusion of the Plant Vogtle Units 3 and 4 related CWIP accounts in rate base, and the State of Georgia enacted the Georgia Nuclear Energy Financing Act, which allows Georgia Power to recover financing costs for nuclear construction projects certified by the Georgia PSC. Financing costs are recovered on all applicable certified costs through annual adjustments to the NCCR tariff up to the certified capital cost of $4.418 billion. As of December 31, 2017, Georgia Power had recovered approximately $1.6 billion of financing costs. On January 30, 2018, Georgia Power filed to decrease the NCCR tariff by approximately $50 million, effective April 1, 2018, pending Georgia PSC approval. The decrease reflects the payments received under the Guarantee Settlement Agreement, refunds to customers ordered by the Georgia PSC aggregating approximately $188 million (Customer Refunds), and the estimated effects of Tax Reform Legislation. The Customer Refunds were recognized as a regulatory liability as of December 31, 2017 and will be paid in three installments of $25 to each retail customer no later than the third quarter 2018.
Georgia Power is required to file semi-annual VCM reports with the Georgia PSC by February 28 and August 31 each year. In October 2013, in connection with the eighth VCM report, the Georgia PSC approved a stipulation (2013 Stipulation) between Georgia Power and the staff of the Georgia PSC to waive the requirement to amend the Plant Vogtle Units 3 and 4 certificate in accordance with the 2009 certification order until the completion of Plant Vogtle Unit 3, or earlier if deemed appropriate by the Georgia PSC and Georgia Power.
On December 20, 2016, the Georgia PSC voted to approve a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with the fifteenth VCM report. On December 21, 2017, the Georgia PSC voted to approve (and issued its related order on January 11, 2018) certain recommendations made by Georgia Power in the seventeenth VCM report and modifying the Vogtle Cost Settlement Agreement. The Vogtle Cost Settlement Agreement, as modified by the January 11, 2018 order, resolved the following regulatory matters related to Plant Vogtle Units 3 and 4: (i) none of the $3.3 billion of costs incurred through December 31, 2015 and reflected in the fourteenth VCM report should be disallowed from rate base on the basis of imprudence; (ii) the Contractor Settlement Agreement was reasonable and prudent and none of the amounts paid pursuant to the Contractor Settlement Agreement should be disallowed from rate base on the basis of imprudence; (iii) (a) capital costs incurred up to $5.680 billion would be presumed to be reasonable and prudent with the burden of proof on any party challenging such costs, (b) Georgia Power would have the burden to show that any capital costs above $5.680 billion were prudent, and (c) a revised capital cost forecast of $7.3 billion (after reflecting the impact of payments received under the Guarantee Settlement Agreement and Customer Refunds) is found reasonable; (iv) construction of Plant Vogtle Units 3 and 4 should be completed, with Southern Nuclear serving as project manager and Bechtel as primary contractor; (v) approved and deemed reasonable Georgia Power's revised schedule placing Plant Vogtle Units 3 and 4 in service in November 2021 and November 2022, respectively; (vi) confirmed that the revised cost forecast does not represent a cost cap and that prudence decisions on cost recovery will be made at a later date, consistent with applicable Georgia law; (vii) reduced the ROE used to calculate the NCCR tariff (a) from 10.95% (the ROE rate setting point authorized by the Georgia PSC in the 2013 ARP) to 10.00% effective January 1, 2016, (b) from 10.00% to 8.30%, effective January 1, 2020, and (c) from 8.30% to 5.30%, effective January 1, 2021 (provided that the ROE in no case will be less than Georgia Power's average cost of long-term debt); (viii) reduced the ROE used for AFUDC equity for Plant Vogtle Units 3 and 4 from 10.00% to Georgia Power's average cost of long-term debt, effective January 1, 2018; and (ix) agreed that upon Unit 3 reaching commercial operation, retail base rates would be adjusted to include carrying costs on those capital costs deemed prudent in the Vogtle Cost Settlement Agreement. The January 11, 2018 order also stated that if Plant Vogtle Units 3 and 4 are not commercially operational by June 1, 2021 and June 1, 2022, respectively, the ROE used to calculate the NCCR tariff will be further reduced by 10 basis points each month (but not lower than Georgia Power's average cost of long-term debt) until the respective unit is commercially operational. The ROE reductions negatively impacted earnings by approximately $20 million in 2016 and $25 million in 2017 and are estimated to have negative earnings impacts of approximately $120 million in 2018 and an aggregate of $585 million from 2019 to 2022. In its January 11, 2018 order, the Georgia PSC stated if other certain conditions and assumptions upon which Georgia Power's seventeenth VCM report are based do not materialize, both Georgia Power and the Georgia PSC reserve the right to reconsider the decision to continue construction.
On February 12, 2018, Georgia Interfaith Power & Light, Inc. and Partnership for Southern Equity, Inc. filed a petition appealing the Georgia PSC's January 11, 2018 order with the Fulton County Superior Court. Georgia Power believes the appeal has no merit; however, an adverse outcome in this appeal could have a material impact on Southern Company's results of operations, financial condition, and liquidity.
The IRS allocated PTCs to each of Plant Vogtle Units 3 and 4, which originally required the applicable unit to be placed in service before 2021. Under the Bipartisan Budget Act of 2018, Plant Vogtle Units 3 and 4 continue to qualify for PTCs. The nominal value of Georgia Power's portion of the PTCs is approximately $500 million per unit.
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

In its January 11, 2018 order, the Georgia PSC also approved $542 million of capital costs incurred during the seventeenth VCM reporting period (January 1, 2017 to June 30, 2017). The Georgia PSC has approved seventeen VCM reports covering the periods through June 30, 2017, including total construction capital costs incurred through that date of $4.4 billion. Georgia Power expects to file its eighteenth VCM report on February 28, 2018 requesting approval of approximately $450 million of construction capital costs (before payments received under the Guarantee Settlement Agreement and the Customer Refunds) incurred from July 1, 2017 through December 31, 2017. Georgia Power's CWIP balance for Plant Vogtle Units 3 and 4 was approximately $4.8 billion as of December 31, 2017, or $3.3 billion net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.
The ultimate outcome of these matters cannot be determined at this time.
Cost and Schedule
Georgia Power's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4 with in service dates of November 2021 and November 2022, respectively, is as follows:
 (in billions)
Project capital cost forecast$7.3
Net investment as of December 31, 2017(3.4)
Remaining estimate to complete$3.9
Note: Excludes financing costs capitalized through AFUDC and is net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.
Georgia Power estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
As construction continues, challenges with management of contractors, subcontractors, and vendors, labor productivity and availability, fabrication, delivery, assembly, and installation of plant systems, structures, and components (some of which are based on new technology and have not yet operated in the global nuclear industry at this scale), or other issues could arise and change the projected schedule and estimated cost.
There have been technical and procedural challenges to the construction and licensing of Plant Vogtle Units 3 and 4 at the federal and state level and additional challenges may arise. Processes are in place that are designed to assure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the NRC that occur throughout construction. As a result of such compliance processes, certain license amendment requests have been filed and approved or are pending before the NRC. Various design and other licensing-based compliance matters, including the timely resolution of Inspections, Tests, Analyses, and Acceptance Criteria and the related approvals by the NRC, may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time.
Other Matters
As of December 31, 2017, Georgia Power had borrowed $2.6 billion related to Plant Vogtle Units 3 and 4 costs through the Loan Guarantee Agreement and a multi-advance credit facility among Georgia Power, the DOE, and the FFB, which provides for borrowings of up to $3.46 billion, subject to the satisfaction of certain conditions. On September 28, 2017, the DOE issued a conditional commitment to Georgia Power for up to approximately $1.67 billion in additional guaranteed loans under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extension approved by the DOE. Final approval and issuance of these additional loan guarantees by the DOE cannot be assured and are subject to the negotiation of definitive agreements, completion of due diligence by the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions. See Note 6 under "DOE Loan Guarantee Borrowings" for additional information, including applicable covenants, events of default, mandatory prepayment events, and conditions to borrowing.
The ultimate outcome of these matters cannot be determined at this time.
Other Matters
A wholly-owned subsidiary of Southern Company Gas owns and operates a natural gas storage facility consisting of two salt dome caverns in Louisiana. Periodic integrity tests are required in accordance with rules of the Louisiana Department of Natural
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Resources (DNR). In August 2017, in connection with an ongoing integrity project, updated seismic mapping indicated the proximity of one of the caverns to the edge of the salt dome may be less than the required minimum and could result in Southern Company Gas retiring the cavern early. At December 31, 2017, the facility's property, plant, and equipment had a net book value of $112 million, of which the cavern itself represents approximately 20%. A potential early retirement of this cavern is dependent upon several factors including compliance with an order from the Louisiana DNR detailing the requirements to place the cavern back in service, which includes, among other things, obtaining core samples to determine the composition of the sheath surrounding the edge of the salt dome.
The cavern continues to maintain its pressures and overall structural integrity. These events were considered in connection with Southern Company Gas' annual long-lived asset impairment analysis, which determined there was no impairment as of December 31, 2017. Any changes in results of monitoring activities, rates at which expiring capacity contracts are re-contracted, timing of placing the cavern back in service, or Louisiana DNR requirements could trigger impairment. Further, early retirement of the cavern could trigger impairment of other long-lived assets associated with the natural gas storage facility. The ultimate outcome of this matter cannot be determined at this time, but could have a significant impact on Southern Company's financial statements.
4. JOINT OWNERSHIP AGREEMENTS
Alabama Power owns an undivided interest in Units 1 and 2 at Plant Miller and related facilities jointly with PowerSouth Energy Cooperative, Inc. Georgia Power owns undivided interests in Plants Vogtle, Hatch, Wansley, and Scherer in varying amounts jointly with one or more of the following entities: Oglethorpe Power Corporation (OPC), MEAG Power, the City of Dalton, Georgia, acting by and through its Board of Water, Light, and Sinking Fund Commissioners, doing business as Dalton Utilities, Florida Power & Light Company, and Jacksonville Electric Authority. In addition, Georgia Power has joint ownership agreements with OPC for the Rocky Mountain facilities. In August 2016, Georgia Power sold its 33% ownership interest in the Intercession City combustion turbine unit to Duke Energy Florida, LLC. Southern Power owns an undivided interest in Plant Stanton Unit A and related facilities jointly with the Orlando Utilities Commission, Kissimmee Utility Authority, and Florida Municipal Power Agency. Southern Company Gas has a 50% undivided ownership interest in the Dalton Pipeline jointly with The Williams Companies, Inc.
At December 31, 2017, Alabama Power's, Georgia Power's, Southern Power's, and Southern Company Gas' percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation with the above entities were as follows:
Facility (Type)
Percent
Ownership
 Plant in Service 
Accumulated
Depreciation
 CWIP
   (in millions)
Plant Vogtle (nuclear) Units 1 and 245.7% $3,564
 $2,141
 $70
Plant Hatch (nuclear)50.1
 1,321
 595
 87
Plant Miller (coal) Units 1 and 291.8
 1,717
 619
 54
Plant Scherer (coal) Units 1 and 28.4
 261
 93
 8
Plant Wansley (coal)53.5
 1,053
 335
 72
Rocky Mountain (pumped storage)25.4
 182
 132
 
Plant Stanton (combined cycle) Unit A65.0
 155
 55
 
Dalton Pipeline (natural gas pipeline)50.0
 241
 2
 13
Georgia Power also owns 45.7% of Plant Vogtle Units 3 and 4, which are currently under construction and had a CWIP balance of $3.3 billion as of December 31, 2017. See Note 3 under "Nuclear Construction" for additional information.
Alabama Power and Georgia Power have contracted to operate and maintain their jointly-owned facilities, except for Rocky Mountain, as agents for their respective co-owners. Southern Power has a service agreement with SCS whereby SCS is responsible for the operation and maintenance of Plant Stanton Unit A. The companies' proportionate share of their plant operating expenses is included in the corresponding operating expenses in the statements of income and each company is responsible for providing its own financing.
Southern Company Gas entered into an agreement to lease its 50% undivided ownership in the Dalton Pipeline that became effective when it was placed in service on August 1, 2017. Under the lease, Southern Company Gas will receive approximately $26 million annually for an initial term of 25 years. The lessee is responsible for maintaining the pipeline during the lease term and for providing service to transportation customers under its FERC-regulated tariff.
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5. INCOME TAXES
Southern Company files a consolidated federal income tax return and various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. PowerSecure and Southern Company Gas became participants in the income tax allocation agreement as of May 9, 2016 and July 1, 2016, respectively. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.
Federal Tax Reform Legislation
Following the enactment of the Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, Southern Company considers all amounts recorded in the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. Southern Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of the Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See Note 3 under "Regulatory Matters" for additional information.
Current and Deferred Income Taxes
Details of income tax provisions are as follows:
 2017 2016 2015
 (in millions)
Federal —     
Current$(62) $1,184
 $(177)
Deferred(6) (342) 1,266
 (68) 842
 1,089
State —     
Current37
 (108) (33)
Deferred173
 217
 138
 210
 109
 105
Total$142
 $951
 $1,194
Net cash payments (refunds) for income taxes in 2017, 2016, and 2015 were $(410) million, $(148) million, and $(9) million, respectively.
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The tax effects of temporary differences between the carrying amounts of assets and liabilities in the financial statements and their respective tax bases, which give rise to deferred tax assets and liabilities, are as follows:
 2017 2016
 (in millions)
Deferred tax liabilities —   
Accelerated depreciation$10,267
 $15,392
Property basis differences955
 2,708
Leveraged lease basis differences251
 314
Employee benefit obligations516
 737
Premium on reacquired debt54
 89
Regulatory assets associated with employee benefit obligations1,046
 1,584
Regulatory assets associated with AROs1,225
 1,781
Other697
 907
Total15,011
 23,512
Deferred tax assets —   
Federal effect of state deferred taxes326
 597
Employee benefit obligations1,307
 1,868
Over recovered fuel clause
 66
Other property basis differences446
 401
Deferred costs69
 100
ITC carryforward2,420
 1,974
Federal NOL carryforward518
 1,084
Unbilled revenue57
 92
Other comprehensive losses84
 152
AROs1,197
 1,732
Estimated Loss on Kemper IGCC722
 484
Deferred state tax assets328
 266
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)465
 
Other485
 679
Total8,424
 9,495
Valuation allowance(149) (23)
Total deferred income taxes6,736
 14,040
Portion included in accumulated deferred tax assets(106) (52)
Accumulated deferred income taxes$6,842
 $14,092
The implementation of the Tax Reform Legislation significantly reduced accumulated deferred income taxes, partially offset by bonus depreciation provisions in the Protecting Americans from Tax Hikes Act. The Tax Reform Legislation also significantly reduced tax-related regulatory assets and increased tax-related regulatory liabilities.
At December 31, 2017, the tax-related regulatory assets to be recovered from customers were $825 million. These assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest.
At December 31, 2017, the tax-related regulatory liabilities to be credited to customers were $7.3 billion. These liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and to unamortized ITCs.
In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies and the natural gas distribution utilities are amortized over the life of the related property with such amortization normally applied as a credit to
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reduce depreciation in the statements of income. Credits amortized in this manner amounted to $22 million in 2017, $22 million in 2016, and $21 million in 2015. Southern Power's deferred federal ITCs are amortized to income tax expense over the life of the asset. Credits amortized in this manner amounted to $57 million in 2017, $37 million in 2016, and $19 million in 2015. Also, Southern Power received cash related to federal ITCs under the renewable energy incentives of $162 million for the year ended December 31, 2015. No cash was received related to these incentives in 2017 and 2016. Furthermore, the tax basis of the asset is reduced by 50% of the ITCs received, resulting in a net deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. The tax benefit of the related basis differences reduced income tax expense by $18 million in 2017, $173 million in 2016, and $54 million in 2015. See "Unrecognized Tax Benefits" below for further information.
Tax Credit Carryforwards
At December 31, 2017, Southern Company had federal ITC and PTC carryforwards (primarily related to Southern Power) which are expected to result in $2.1 billion of federal income tax benefits. The federal ITC carryforwards begin expiring in 2034 but are expected to be fully utilized by 2027. The PTC carryforwards begin expiring in 2032 but are expected to be fully utilized by 2027. The acquisition of additional renewable projects could further delay existing tax credit carryforwards. The ultimate outcome of these matters cannot be determined at this time.
Additionally, Southern Company had state ITC carryforwards for the state of Georgia totaling approximately $318 million, which will expire between 2020 and 2027 but are expected to be fully utilized.
Net Operating Loss
After carrying back portions of the federal NOL generated in 2016, Southern Company had a consolidated federal NOL carryforward of approximately $2.3 billion at December 31, 2017. The federal NOL will begin expiring in 2037 but is expected to be fully utilized by 2019. The ultimate outcome of this matter cannot be determined at this time.
At December 31, 2017, the state NOL carryforwards for Southern Company's subsidiaries were as follows:
JurisdictionApproximate NOL CarryforwardsApproximate Net State Income Tax Benefit
Tax Year NOL
Begins Expiring
 (in millions) 
Mississippi$2,890
$114
2032
Oklahoma986
47
2036
Georgia524
23
2019
New York229
13
2036
New York City209
15
2036
Florida304
13
2034
Other states465
24
Various
Total$5,607
$249

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Effective Tax Rate
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
 2017 2016 2015
Federal statutory rate35.0 % 35.0 % 35.0 %
State income tax, net of federal deduction12.5
 2.1
 1.9
Employee stock plans dividend deduction(4.1) (1.2) (1.2)
Non-deductible book depreciation3.1
 0.9
 1.2
AFUDC-Equity(2.6) (2.0) (2.2)
Non-deductible equity portion on Kemper IGCC write-off15.7
 
 
ITC basis difference(1.7) (5.0) (1.5)
Federal PTCs(12.1) (1.2) 
Amortization of ITC(4.2) (0.9) (0.5)
Tax Reform Legislation(25.6) 
 
Other(2.7) (0.4) 0.2
Effective income tax rate13.3 % 27.3 % 32.9 %
Southern Company's effective tax rate is typically lower than the statutory rate due to employee stock plans' dividend deduction, non-taxable AFUDC equity, and federal income tax benefits from ITCs and PTCs. However, in 2017, the effective tax rate was primarily lower due to the remeasurement of deferred income taxes resulting from the Tax Reform Legislation.
In March 2016, the FASB issued ASU 2016-09, which changed the accounting for income taxes for share-based payment award transactions. Entities are required to recognize all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation as income tax expense or benefit in the income statement. The adoption of ASU 2016-09 did not have a material impact on Southern Company's overall effective tax rate. See Note 1 under "Recently Issued Accounting Standards" for additional information.
Legal Entity Reorganization
In September 2017, Southern Power began a legal entity reorganization of various direct and indirect subsidiaries that own and operate substantially all of its solar facilities, including certain subsidiaries owned in partnership with various third parties. The reorganization included the purchase of all of the redeemable noncontrolling interests, representing 10% of the membership interests, in Southern Turner Renewable Energy, LLC. The reorganization is expected to be substantially completed in the first quarter 2018 and is expected to result in estimated tax benefits totaling between $50 million and $55 million related to certain changes in state apportionment rates and net operating loss carryforward utilization that will be recorded in the first quarter 2018. The ultimate outcome of this matter cannot be determined at this time.
Unrecognized Tax Benefits
Changes during the year in unrecognized tax benefits were as follows:
 2017 2016 2015
 (in millions)
Unrecognized tax benefits at beginning of year$484
 $433
 $170
Tax positions increase from current periods10
 45
 43
Tax positions increase from prior periods10
 21
 240
Tax positions decrease from prior periods(196) (15) (20)
Reductions due to settlements(290) 
 
Balance at end of year$18
 $484
 $433
The tax positions increase from current and prior periods for 2017 and 2016 relate primarily to state tax benefits and charitable contribution carryforwards that were impacted as a result of the settlement of R&E expenditures associated with the Kemper County energy facility, as well as deductions for R&E expenditures associated with the Kemper County energy facility. The tax positions decrease from prior periods for 2017 and 2016, and the reductions due to settlements for 2017, relate primarily to the
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settlement of R&E expenditures associated with the Kemper County energy facility and federal income tax benefits from deferred ITCs. See Note 3 under "Kemper County Energy Facility" and "Section 174 Research and Experimental Deduction" herein for more information.
The impact on Southern Company's effective tax rate, if recognized, is as follows:

2017
2016
2015

(in millions)
Tax positions impacting the effective tax rate$18

$20

$10
Tax positions not impacting the effective tax rate

464

423
Balance of unrecognized tax benefits$18

$484

$433
The tax positions impacting the effective tax rate primarily relate to state tax benefits and charitable contribution carryforwards that were impacted as a result of the settlement of R&E expenditures associated with the Kemper County energy facility and Southern Company's estimate of the uncertainty related to the amount of those benefits. The tax positions not impacting the effective tax rate for 2016 and 2015 relate to deductions for R&E expenditures associated with the Kemper County energy facility. See "Section 174 Research and Experimental Deduction" herein for more information. These amounts are presented on a gross basis without considering the related federal or state income tax impact.
Accrued interest for all tax positions other than the Section 174 R&E deductions was immaterial for all years presented.
Southern Company classifies interest on tax uncertainties as interest expense. Southern Company did not accrue any penalties on uncertain tax positions.
It is reasonably possible that the amount of the unrecognized tax benefits could change within 12 months. The settlement of federal and state audits could impact the balances significantly. At this time, an estimate of the range of reasonably possible outcomes cannot be determined.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2016. Southern Company is a participant in the Compliance Assurance Process of the IRS. However, the pre-Merger Southern Company Gas 2014, 2015, and June 30, 2016 federal tax returns are currently under audit. The audits for Southern Company's state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2011.
Section 174 Research and Experimental Deduction
Southern Company has reflected deductions for R&E expenditures related to the Kemper County energy facility in its federal income tax calculations since 2013 and filed amended federal income tax returns for 2008 through 2013 to also include such deductions. In December 2016, Southern Company and the IRS reached a proposed settlement, which was approved on September 8, 2017 by the U.S. Congress Joint Committee on Taxation, resolving a methodology for these deductions. As a result of this approval, Southern Company recognized $176 million of previously unrecognized tax benefits and reversed $36 million of associated accrued interest.
6. FINANCING
Securities Due Within One Year
A summary of scheduled maturities of securities due within one year at December 31 was as follows:
 2017 2016
 (in millions)
Senior notes$2,354
 $1,995
Other long-term debt1,420
 485
Revenue bonds(*)
90
 76
Capitalized leases31
 32
Unamortized debt issuance expense/discount(3) (1)
Total$3,892
 $2,587
(*)Includes $50 million in revenue bonds classified as short term at December 31, 2017 that were remarketed in an index rate mode subsequent to December 31, 2017. Also includes $40 million in pollution control revenue bonds classified as short term since they are variable rate demand obligations supported by short-term credit facilities; however, the final maturity dates range from 2020 to 2028.
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Maturities through 2022 applicable to total long-term debt are as follows: $3.9 billion in 2018; $3.2 billion in 2019; $3.2 billion in 2020; $3.1 billion in 2021; and $2.2 billion in 2022.
Bank Term Loans
Southern Company and certain of its subsidiaries have entered into various bank term loan agreements. Unless otherwise stated, the proceeds of these loans were used to repay existing indebtedness and for general corporate purposes, including working capital and, for the subsidiaries, their continuous construction programs.
At December 31, 2017, Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Power Company had outstanding bank term loans totaling $450 million, $45 million, $250 million, $900 million, and $420 million, respectively, of which $1.5 billion are reflected in the statements of capitalization as long-term debt and $600 million are reflected in the balance sheet as notes payable. At December 31, 2016, Southern Company, Alabama Power, Gulf Power, Mississippi Power, and Southern Power Company had outstanding bank term loans totaling $400 million, $45 million, $100 million, $1.2 billion, and $380 million, respectively, of which $2.0 billion were reflected in the statements of capitalization as long-term debt and $100 million were reflected in the balance sheet as notes payable.
In June 2017, Southern Company entered into two $100 million aggregate principal amount short-term floating rate bank term loan agreements, which mature on June 21, 2018 and June 29, 2018 and bear interest based on one-month LIBOR.
In August 2017, Southern Company borrowed $250 million pursuant to a short-term uncommitted bank credit arrangement, which bears interest at a rate agreed upon by Southern Company and the bank from time to time and is payable on no less than 30 days' demand by the bank.
In June 2017, Georgia Power entered into two short-term floating rate bank loans in aggregate principal amounts of $50 million and $150 million, with maturity dates of December 1, 2017 and May 31, 2018, respectively, and one long-term floating rate bank loan of $100 million, with a maturity date of June 28, 2018, which was amended in August 2017 to extend the maturity date to October 26, 2018. These loans bear interest based on one-month LIBOR. Also in June 2017, Georgia Power borrowed $500 million pursuant to a short-term uncommitted bank credit arrangement, which bears interest at a rate agreed upon by Georgia Power and the bank from time to time and is payable on no less than 30 days' demand by the bank.
In August 2017, Georgia Power repaid its $50 million floating rate bank loan due December 1, 2017 and $250 million of the $500 million aggregate principal amount outstanding pursuant to its uncommitted bank credit arrangement. In December 2017, Georgia Power repaid the remaining $250 million aggregate principal amount outstanding pursuant to its uncommitted bank credit arrangement.
In March 2017, Gulf Power extended the maturity of its $100 million short-term floating rate bank loan bearing interest based on one-month LIBOR from April 2017 to October 2017 and subsequently repaid the loan in May 2017.
In June 2017, Mississippi Power prepaid $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan, which matures on March 30, 2018.
In September 2017, Southern Power amended its $60 million aggregate principal amount floating rate term loan to, among other things, increase the aggregate principal amount to $100 million and extend the maturity date from September 2017 to October 2018.
The outstanding bank loans as of December 31, 2017 have covenants that limit debt levels to a percentage of total capitalization. The percentage is 70% for Southern Company and 65% for Alabama Power, Georgia Power, Mississippi Power, and Southern Power Company, as defined in the agreements. For purposes of these definitions, debt excludes any long-term debt payable to affiliated trusts and other hybrid securities. Additionally, for Southern Company and Southern Power Company, for purposes of these definitions, debt excludes any project debt incurred by certain subsidiaries of Southern Power Company to the extent such debt is non-recourse to Southern Power Company and capitalization excludes the capital stock or other equity attributable to such subsidiary. At December 31, 2017, each of Southern Company, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, and Southern Power Company was in compliance with its debt limits.
DOE Loan Guarantee Borrowings
Pursuant to the loan guarantee program established under Title XVII of the Energy Policy Act of 2005 (Title XVII Loan Guarantee Program), Georgia Power and the DOE entered into the Loan Guarantee Agreement in 2014, under which the DOE agreed to guarantee the obligations of Georgia Power under a note purchase agreement (FFB Note Purchase Agreement) among the DOE, Georgia Power, and the FFB and a related promissory note (FFB Promissory Note). The FFB Note Purchase Agreement and the FFB Promissory Note provide for a multi-advance term loan facility (FFB Credit Facility), under which Georgia Power may make term loan borrowings through the FFB.
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On July 27, 2017, Georgia Power entered into an amendment to the Loan Guarantee Agreement (LGA Amendment) in connection with the DOE's consent to Georgia Power's entry into the Vogtle Services Agreement and the related intellectual property licenses (IP Licenses).
Under the terms of the Loan Guarantee Agreement, upon termination of the Vogtle 3 and 4 Agreement, further advances are conditioned upon the DOE's approval of any agreements entered into in replacement of the Vogtle 3 and 4 Agreement. Under the terms of the LGA Amendment, Georgia Power will not request any advances unless and until certain conditions are satisfied, including (i) receipt of the DOE's approval of the Bechtel Agreement (together with the Vogtle Services Agreement and the IP Licenses, the Replacement EPC Arrangements) and (ii) Georgia Power's entry into a further amendment to the Loan Guarantee Agreement with the DOE to reflect the Replacement EPC Arrangements.
Proceeds of advances made under the FFB Credit Facility are used to reimburse Georgia Power for Eligible Project Costs. Aggregate borrowings under the FFB Credit Facility may not exceed the lesser of (i) 70% of Eligible Project Costs or (ii) approximately $3.46 billion.
On September 28, 2017, the DOE issued a conditional commitment to Georgia Power for up to approximately $1.67 billion of additional guaranteed loans under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extension approved by the DOE. Final approval and issuance of these additional loan guarantees by the DOE cannot be assured and are subject to the negotiation of definitive agreements, completion of due diligence by the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions.
All borrowings under the FFB Credit Facility are full recourse to Georgia Power, and Georgia Power is obligated to reimburse the DOE for any payments the DOE is required to make to the FFB under the guarantee. Georgia Power's reimbursement obligations to the DOE are full recourse and secured by a first priority lien on (i) Georgia Power's 45.7% undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units under construction, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. There are no restrictions on Georgia Power's ability to grant liens on other property.
In addition to the conditions described above, future advances are subject to satisfaction of customary conditions, as well as certification of compliance with the requirements of the Title XVII Loan Guarantee Program, including accuracy of project-related representations and warranties, delivery of updated project-related information, and evidence of compliance with the prevailing wage requirements of the Davis-Bacon Act of 1931, as amended, and certification from the DOE's consulting engineer that proceeds of the advances are used to reimburse Eligible Project Costs.
Upon satisfaction of all conditions described above, advances may be requested under the FFB Credit Facility on a quarterly basis through 2020. The final maturity date for each advance under the FFB Credit Facility is February 20, 2044. Interest is payable quarterly and principal payments will begin on February 20, 2020. Borrowings under the FFB Credit Facility will bear interest at the applicable U.S. Treasury rate plus a spread equal to 0.375%.
At both December 31, 2017 and 2016, Georgia Power had $2.6 billion of borrowings outstanding under the FFB Credit Facility.
Under the Loan Guarantee Agreement, Georgia Power is subject to customary borrower affirmative and negative covenants and events of default. In addition, Georgia Power is subject to project-related reporting requirements and other project-specific covenants and events of default.
In the event certain mandatory prepayment events occur, the FFB's commitment to make further advances under the FFB Credit Facility will terminate and Georgia Power will be required to prepay the outstanding principal amount of all borrowings under the FFB Credit Facility over a period of five years (with level principal amortization). Among other things, these mandatory prepayment events include (i) the termination of the Vogtle Services Agreement or rejection of the Vogtle Services Agreement in bankruptcy if Georgia Power does not maintain access to intellectual property rights under the IP Licenses; (ii) a decision by Georgia Power not to continue construction of Plant Vogtle Units 3 and 4; (iii) cancellation of Plant Vogtle Units 3 and 4 by the Georgia PSC, or by Georgia Power if authorized by the Georgia PSC; and (iv) cost disallowances by the Georgia PSC that could have a material adverse effect on completion of Plant Vogtle Units 3 and 4 or Georgia Power's ability to repay the outstanding borrowings under the FFB Credit Facility. Under certain circumstances, insurance proceeds and any proceeds from an event of taking must be applied to immediately prepay outstanding borrowings under the FFB Credit Facility. In addition, if Georgia Power discontinues construction of Plant Vogtle Units 3 and 4, Georgia Power would be obligated to immediately repay a portion of the outstanding borrowings under the FFB Credit Facility to the extent such outstanding borrowings exceed 70% of Eligible Project Costs, net of the proceeds received by Georgia Power under the Guarantee Settlement Agreement. Georgia Power also may voluntarily prepay outstanding borrowings under the FFB Credit Facility. Under the FFB Credit Facility, any prepayment (whether mandatory or optional) will be made with a make-whole premium or discount, as applicable.
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In connection with any cancellation of Plant Vogtle Units 3 and 4 that results in a mandatory prepayment event, the DOE may elect to continue construction of Plant Vogtle Units 3 and 4. In such an event, the DOE will have the right to assume Georgia Power's rights and obligations under the principal agreements relating to Plant Vogtle Units 3 and 4 and to acquire all or a portion of Georgia Power's ownership interest in Plant Vogtle Units 3 and 4.
Senior Notes
Southern Company and its subsidiaries issued a total of $4.0 billion of senior notes in 2017. Southern Company issued $0.3 billion and its subsidiaries issued a total of $3.7 billion. The proceeds of Southern Company's issuances were used to repay short-term indebtedness and for other general corporate purposes. Except as described below, the proceeds of Southern Company's subsidiaries' issuances were used to repay long-term indebtedness, to repay short-term indebtedness, and for other general corporate purposes, including the applicable subsidiaries' continuous construction programs. A portion of the proceeds of Gulf Power's senior note issuances was used to redeem all of Gulf Power's outstanding shares of preference stock. See "Redeemable Preferred Stock of Subsidiaries" herein for additional information.
At December 31, 2017 and 2016, Southern Company and its subsidiaries had a total of $35.1 billion and $33.0 billion, respectively, of senior notes outstanding. At December 31, 2017 and 2016, Southern Company had a total of $10.2 billion and $10.3 billion, respectively, of senior notes outstanding. These amounts include senior notes due within one year.
Since Southern Company is a holding company the right of Southern Company and, hence, the right of creditors of Southern Company (including holders of Southern Company senior notes) to participate in any distribution of the assets of any subsidiary of Southern Company, whether upon liquidation, reorganization or otherwise, is subject to prior claims of creditors and preferred stockholders of such subsidiary.
Junior Subordinated Notes
At December 31, 2017 and 2016, Southern Company and its subsidiaries had a total of $3.6 billion and $2.4 billion, respectively, of junior subordinated notes outstanding.
In June 2017, Southern Company issued $500 million aggregate principal amount of Series 2017A 5.325% Junior Subordinated Notes due June 21, 2057. The proceeds were used to repay short-term indebtedness and for other general corporate purposes.
In November 2017, Southern Company issued $450 million aggregate principal amount of Series 2017B 5.25% Junior Subordinated Notes due December 1, 2077. The proceeds were used to repay short-term indebtedness and for other general corporate purposes.
In September 2017, Georgia Power issued $270 million aggregate principal amount of Series 2017A 5.00% Junior Subordinated Notes due October 1, 2077. The proceeds were used to redeem all outstanding shares of Georgia Power's preferred and preference stock. See "Redeemable Preferred Stock of Subsidiaries" herein for additional information.
Pollution Control Revenue Bonds
Pollution control revenue bond obligations represent loans to the traditional electric operating companies from public authorities of funds derived from sales by such authorities of revenue bonds issued to finance pollution control and solid waste disposal facilities. In some cases, the pollution control revenue bond obligations represent obligations under installment sales agreements with respect to facilities constructed with the proceeds of revenue bonds issued by public authorities. The traditional electric operating companies had $3.3 billion of outstanding pollution control revenue bond obligations at December 31, 2017 and 2016, which includes pollution control revenue bonds classified as due within one year. The traditional electric operating companies are required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. Proceeds from certain issuances are restricted until qualifying expenditures are incurred.
Plant Daniel Revenue Bonds
In 2011, in connection with Mississippi Power's election under its operating lease of Plant Daniel Units 3 and 4 to purchase the assets, Mississippi Power assumed the obligations of the lessor related to $270 million aggregate principal amount of Mississippi Business Finance Corporation Taxable Revenue Bonds, 7.13% Series 1999A due October 20, 2021, issued for the benefit of the lessor. See "Assets Subject to Lien" herein for additional information.
Gas Facility Revenue Bonds
Pivotal Utility Holdings, Inc., a subsidiary of Southern Company Gas (Pivotal Utility Holdings), is party to a series of loan agreements with the New Jersey Economic Development Authority and Brevard County, Florida under which five series of gas facility revenue bonds have been issued with maturities ranging from 2022 to 2033. These revenue bonds are issued by state
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agencies or counties to investors, and proceeds from each issuance then are loaned to Southern Company Gas. The amount of gas facility revenue bonds outstanding at December 31, 2017 and 2016 was $200 million.
The Elizabethtown Gas asset sale agreement requires that bonds representing $180 million of the total that are currently eligible for redemption at par be redeemed on or prior to consummation of the sale. The ultimate outcome of this matter cannot be determined at this time. See Note 12 under "Southern Company Gas – Proposed Sale of Elizabethtown Gas and Elkton Gas" for additional information.
Other Revenue Bonds
Other revenue bond obligations represent loans to Mississippi Power from a public authority of funds derived from the sale by such authority of revenue bonds issued to finance a portion of the costs of constructing the Kemper County energy facility and related facilities.
Mississippi Power had $50 million of such obligations outstanding related to tax-exempt revenue bonds at December 31, 2017 and 2016. Such amounts are reflected in the statements of capitalization as other long-term debt.
First Mortgage Bonds
Nicor Gas, a subsidiary of Southern Company Gas, had $1.0 billion and $625 million of first mortgage bonds outstanding at December 31, 2017 and 2016, respectively. These bonds have been issued with maturities ranging from 2019 to 2057. Substantially all of Nicor Gas' properties are subject to the lien of the indenture securing these first mortgage bonds. See "Assets Subject to Lien" herein for additional information.
On August 10, 2017, Nicor Gas issued $100 million aggregate principal amount of First Mortgage Bonds 3.03% Series due August 10, 2027 and $100 million aggregate principal amount of First Mortgage Bonds 3.62% Series due August 10, 2037. On November 1, 2017, Nicor Gas issued $100 million aggregate principal amount of First Mortgage Bonds 3.85% Series due August 10, 2047 and $100 million aggregate principal amount of First Mortgage Bonds 4.00% Series due August 10, 2057. The proceeds were used to repay short-term indebtedness incurred under the Nicor Gas commercial paper program and for other working capital needs.
Long-Term Debt Payable to an Affiliated Trust
Alabama Power has formed a wholly-owned trust subsidiary for the purpose of issuing preferred securities. The proceeds of the related equity investments and preferred security sales were loaned back to Alabama Power through the issuance of junior subordinated notes totaling $206 million outstanding as of December 31, 2017 and 2016, which constitute substantiallyowns all of the assets of this trust and are reflected in the balance sheets as long-term debt payable. Alabama Power considers that the mechanisms and obligations relating to the preferred securities issued for its benefit, taken together, constitute a full and unconditional guarantee by it of the trust's payment obligations with respect to these securities. At December 31, 2017 and 2016, trust preferred securities of $200 million were outstanding.
Capital Leases
Assets acquired under capital leases are recorded in the balance sheets as property, plant, and equipment and the related obligations are classified as long-term debt.
In 2013, Mississippi Power entered into a nitrogen supply agreement for the air separation unit of the Kemper County energy facility, which resulted in a capital lease obligation of $74 million at December 31, 2016. Following the suspension of the Kemper IGCC, Mississippi Power entered into an asset purchase and settlement agreement in December 2017 with the lessor, which terminated the capital lease obligation. See Note 3 under "Kemper County Energy Facility" for additional information.
At December 31, 2017 and 2016, the capitalized lease obligations for Georgia Power's corporate headquarters building were $22 million and $28 million, respectively, with an annual interest rate of 7.9%.
At December 31, 2017 and 2016, a subsidiary of Southern Company had capital lease obligations of approximately $177 million and $29 million, respectively, for an office building and certain computer equipment including desktops, laptops, servers, printers, and storage devices with annual interest rates that range from 1.5% to 4.7%.
Assets Subject to Lien
Each of Southern Company's subsidiaries is organized as a legal entity, separate and apart from Southern Company and its other subsidiaries. There are no agreements or other arrangements among the Southern Company system companies under which the assets of one company have been pledged or otherwise made available to satisfy obligations of Southern Company or any of its other subsidiaries.
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Gulf Power has granted one or more liens on certain of its property in connection with the issuance of certain series of pollution control revenue bonds with an aggregate outstanding principal amount of $41 million as of December 31, 2017.
The revenue bonds assumed in conjunction with Mississippi Power's purchase of Plant Daniel Units 3 and 4 are secured by Plant Daniel Units 3 and 4 and certain related personal property. See "Plant Daniel Revenue Bonds" herein for additional information.
On October 4, 2017, Mississippi Power executed agreements with its largest retail customer, Chevron Products Company (Chevron), to continue providing retail service to the Chevron refinery in Pascagoula, Mississippi through 2038, subject to the approval of the Mississippi PSC. The agreements grant Chevron a security interest in the co-generation assets, with a net book value of approximately $93 million, located at Chevron's refinery that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the three rating agencies.
See "DOE Loan Guarantee Borrowings" above for information regarding certain borrowings of Georgia Power that are secured by a first priority lien on (i) Georgia Power's 45.7% undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units under construction, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4.
The first mortgage bonds issued by Nicor Gas are secured by substantially all of Nicor Gas' properties. See "First Mortgage Bonds" herein for additional information.
Under the terms of the PPA and the expansion PPA for Southern Power's Mankato project, which was acquired in 2016, approximately $442 million of assets, primarily related to property, plant, and equipment, are subject to lien at December 31, 2017. See Note 12 under "Southern Power" for additional information.
During 2015, Southern Power indirectly acquired a 51% membership interest in RE Roserock LLC (Roserock), the owner of the Roserock solar facility in Pecos County, Texas. Roserock is in a litigation dispute with McCarthy Building Companies, Inc. (McCarthy) regarding damage to certain solar panels during installation. In connection therewith, Roserock is withholding payments of approximately $26 million from McCarthy, and McCarthy has filed mechanic's liens on the Roserock facility for the same amount. Southern Power intends to vigorously pursue its claims against McCarthy and defend against McCarthy's claims, the ultimate outcome of which cannot be determined at this time.
Bank Credit Arrangements
At December 31, 2017, committed credit arrangements with banks were as follows:
 Expires   Executable Term Loans 
Expires Within
One Year
Company2018 2019 2020 2022 Total Unused 
One
Year
 
Two
Years
 Term Out No Term Out
 (in millions)
Southern Company(a)
$
 $
 $
 $2,000
 $2,000
 $1,999
 $
 $
 $
 $
Alabama Power35
 
 500
 800
 1,335
 1,335
 
 
 
 35
Georgia Power
 
 
 1,750
 1,750
 1,732
 
 
 
 
Gulf Power30
 25
 225
 
 280
 280
 45
 
 20
 10
Mississippi Power100
 
 
 
 100
 100
 
 
 
 100
Southern Power Company(b)

 
 
 750
 750
 728
 
 
 
 
Southern Company Gas(c)

 
 
 1,900
 1,900
 1,890
 
 
 
 
Other30
 
 
 
 30
 30
 20
 
 20
 10
Southern Company Consolidated$195
 $25
 $725
 $7,200
 $8,145
 $8,094
 $65
 $
 $40
 $155
(a)Represents the Southern Company parent entity.
(b)Does not include Southern Power's $120 million continuing letter of credit facility for standby letters of credit expiring in 2019, of which $19 million remains unused at December 31, 2017.
(c)Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $1.4 billion of these arrangements. Southern Company Gas' committed credit arrangements also include $500 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas.
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In May 2017, Southern Company, Alabama Power, Georgia Power, and Southern Power Company each amended certain of their multi-year credit arrangements, which, among other things, extended the maturity dates from 2020 to 2022. Southern Company and Southern Power Company increased their borrowing ability under these arrangements to $2.0 billion from $1.25 billion and to $750 million from $600 million, respectively. Southern Company also terminated its $1.0 billion facility maturing in 2018. Also in May 2017, Southern Company Gas Capital and Nicor Gas terminated their existing credit arrangements for $1.3 billion and $700 million, respectively, which were to mature in 2017 and 2018, and entered into a new multi-year credit arrangement with $1.4 billion and $500 million currently allocated to Southern Company Gas Capital and Nicor Gas, respectively, maturing in 2022. Pursuant to the new multi-year credit arrangement, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. In September 2017, Alabama Power also amended its $500 million multi-year credit arrangement, which, among other things, extended the maturity date from 2018 to 2020. In November 2017, Gulf Power amended $195 million of its multi-year credit arrangements to extend the maturity dates from 2017 and 2018 to 2020 and Mississippi Power amended its one-year credit arrangements in an aggregate amount of $100 million to extend the maturity dates from 2017 to 2018.
Most of the bank credit arrangements require payment of commitment fees based on the unused portion of the commitments or the maintenance of compensating balances with the banks. Commitment fees average less than 1/4 of 1% for Southern Company, the traditional electric operating companies, Southern Power Company, Southern Company Gas, and Nicor Gas. Compensating balances are not legally restricted from withdrawal.
Subject to applicable market conditions, Southern Company and its subsidiaries expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, Southern Company and its subsidiaries may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
Southern Company's, Southern Company Gas', and Nicor Gas' credit arrangements contain covenants that limit debt levels to 70% of total capitalization, as defined in the agreements, and most of the other subsidiaries' bank credit arrangements contain covenants that limit debt levels to 65% of total capitalization, as defined in the agreements. For purposes of these definitions, debt excludes the long-term debt payable to affiliated trusts and, in certain arrangements and other hybrid securities. Additionally, for Southern Company and Southern Power Company, for purposes of these definitions, debt excludes any project debt incurred by certain subsidiaries of Southern Power Company to the extent such debt is non-recourse to Southern Power Company and capitalization excludes the capital stock or other equity attributable to such subsidiaries. At December 31, 2017, Southern Company, the traditional electric operating companies, Southern Power Company, Southern Company Gas, and Nicor Gas were each in compliance with their respective debt limit covenants.
A portion of the $8.1 billion unused credit with banks is allocated to provide liquidity support to the revenue bonds of the traditional electric operating companies and the commercial paper programs of Southern Company, the traditional electric operating companies, Southern Power Company, Southern Company Gas, and Nicor Gas. The amount of variable rate revenue bonds of the traditional electric operating companies outstanding requiring liquidity support as of December 31, 2017 was approximately $1.5 billion as compared to $1.9 billion at December 31, 2016. In addition, at December 31, 2017, the traditional electric operating companies had approximately $714 million of revenue bonds outstanding that were required to be remarketed within the next 12 months. Subsequent to December 31, 2017, $50 million of these revenue bonds of Mississippi Power which were in a long-term interest rate mode were remarketed in an index rate mode.
Southern Company, the traditional electric operating companies (other than Mississippi Power), Southern Power Company, Southern Company Gas, and Nicor Gas make short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above. Commercial paper and short-term bank term loans are included in notes payable in the balance sheets.
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Details of short-term borrowings were as follows:
 Short-term Debt at the End of the Period
 
Amount
Outstanding
 
Weighted Average
Interest Rate
 (in millions)  
December 31, 2017:   
Commercial paper$1,832
 1.8%
Short-term bank debt607
 2.3%
Total$2,439
 1.9%
December 31, 2016:   
Commercial paper$1,909
 1.1%
Short-term bank debt123
 1.7%
Total$2,032
 1.1%
In addition to the short-term borrowings of Southern Power Company included in the table above, at December 31, 2016, Southern Power Company subsidiaries had credit agreements (Project Credit Facilities) assumed with the acquisition of certain solar facilities, which were non-recourse to Southern Power Company, the proceeds of which were used to finance project costs related to such solar facilities. The Project Credit Facilities were fully repaid in January 2017 and had total amounts outstanding of $209 million at a weighted average interest rate of 2.1% at December 31, 2016.
Redeemable Preferred Stock of Subsidiaries
At December 31, 2016, each of the traditional electric operating companies had outstanding preferred and/or preference stock. During 2017, Alabama Power and Gulf Power each redeemed all of its outstanding preference stock and Georgia Power redeemed all of its outstanding preferred and preference stock. The preferredcommon stock of Alabama Power and Mississippi Power contains a feature that allows the holders to elect a majority of such subsidiary's board of directors if preferred dividends are not paid for four consecutive quarters. Because such a potential redemption-triggering event is not solely within the control of Alabama Power and Mississippi Power, this preferred stock is presented as "Redeemable Preferred Stock of Subsidiaries" in a manner consistent with temporary equity under applicable accounting standards. The preferred and preference stock at Georgia Power and the preference stock at Alabama Power and Gulf Power did not contain such a provision. As a result, under applicable accounting standards, the preferred and preference stock at Georgia Power and the preference stock at Alabama Power and Gulf Power are presented as "Preferred and Preference Stock of Subsidiaries," a separate component of "Stockholders' Equity," on Southern Company's balance sheets, statements of capitalization, and statements of stockholders' equity.
The following table presents changes during the year in redeemable preferred stock of subsidiaries for Southern Company:
 Redeemable Preferred Stock of Subsidiaries
 (in millions)
Balance at December 31, 2014$375
Issued
Redeemed(262)
Issuance costs5
Balance at December 31, 2015:118
Issued
Redeemed
Balance at December 31, 2016:118
Issued250
Redeemed(38)
Issuance costs(6)
Balance at December 31, 2017:$324
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7. COMMITMENTS
Fuel and Purchased Power Agreements
To supply a portion of the fuel requirements of the generating plants, the Southern Company system has entered into various long-term commitments for the procurement and delivery of fossil and nuclear fuel which are not recognized on the balance sheets. In 2017, 2016, and 2015, the traditional electric operating companies and Southern Power incurred fuel expense of $4.4 billion, $4.4 billion, and $4.8 billion, respectively, the majority of which was purchased under long-term commitments. Southern Company expects that a substantial amount of the Southern Company system's future fuel needs will continue to be purchased under long-term commitments.
In addition, the Southern Company system has entered into various long-term commitments for the purchase of capacity and electricity, some of which are accounted for as operating leases or have been used by a third party to secure financing. Total capacity expense under PPAs accounted for as operating leases was $235 million, $232 million, and $227 million for 2017, 2016, and 2015, respectively.
Estimated total obligations under these commitments at December 31, 2017 were as follows:
 Operating Leases Other
 (in millions)
2018$247
 $7
2019250
 6
2020247
 4
2021249
 5
2022252
 4
2023 and thereafter806
 38
Total$2,051
 $64
Pipeline Charges, Storage Capacity, and Gas Supply
Pipeline charges, storage capacity, and gas supply include charges recoverable through a natural gas cost recovery mechanism, or alternatively, billed to marketers selling retail natural gas, as well as demand charges associated with Southern Company Gas' wholesale gas services. The gas supply balance includes amounts for gas commodity purchase commitments associated with Southern Company Gas' gas marketing services of 35 million mmBtu at floating gas prices calculated using forward natural gas prices at December 31, 2017 and valued at $101 million. Southern Company Gas provides guarantees to certain gas suppliers for certain of its subsidiaries in support of payment obligations.
Expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets as of December 31, 2017 were as follows:
 Pipeline Charges, Storage Capacity, and Gas Supply
 (in millions)
2018$813
2019552
2020416
2021375
2022339
2023 and thereafter2,294
Total$4,789
Operating Leases
The Southern Company system has operating lease agreements with various terms and expiration dates. Total rent expense was $176 million, $169 million, and $130 million for 2017, 2016, and 2015, respectively. Southern Company includes any step rents, fixed escalations, and lease concessions in its computation of minimum lease payments.
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As of December 31, 2017, estimated minimum lease payments under operating leases were as follows:
 Minimum Lease Payments
 
Barges &
Railcars
 
Other(*)
 Total
 (in millions)
2018$21
 $128
 $149
201911
 113
 124
20209
 99
 108
20218
 87
 95
20226
 77
 83
2023 and thereafter5
 963
 968
Total$60
 $1,467
 $1,527
(*)Includes operating leases for cellular tower space, facilities, vehicles, and other equipment.
For the traditional electric operating companies, a majority of the barge and railcar lease expenses are recoverable through fuel cost recovery provisions.
In addition to the above rental commitments, Alabama Power and Georgia Power have obligations upon expiration of certain railcar leases with respect to the residual value of the leased property. These leases have terms expiring through 2024 with maximum obligations under these leases of $44 million. At the termination of the leases, the lessee may renew the lease, exercise its purchase option, or the property can be sold to a third party. Alabama Power and Georgia Power expect that the fair market value of the leased property would substantially reduce or eliminate the payments under the residual value obligations.
Guarantees
In 2013, Georgia Power entered into an agreement that requires Georgia Power to guarantee certain payments of a gas supplier for Plant McIntosh for a period up to 15 years. The guarantee is expected to be terminated if certain events occur within one year of the initial gas deliveries in 2018. In the event the gas supplier defaults on payments, the maximum potential exposure under the guarantee is approximately $43 million.
As discussed above under "Operating Leases," Alabama Power and Georgia Power have entered into certain residual value guarantees.
8. COMMON STOCK
Stock Issued
During 2017, Southern Company issued approximately 14.6 million shares of common stock primarily through employee equity compensation plans and received proceeds of approximately $659 million.
In addition, during the second and third quarters of 2017, Southern Company issued a total of approximately 2.7 million shares of common stock through at-the-market issuances pursuant to sales agency agreements related to Southern Company's continuous equity offering program and received cash proceeds of approximately $134 million, net of $1.1 million in fees and commissions.
Shares Reserved
At December 31, 2017, a total of 71 million shares were reserved for issuance pursuant to the Southern Investment Plan, employee savings plans, the Outside Directors Stock Plan, the Omnibus Incentive Compensation Plan (which includes stock options and performance share units as discussed below), and an at-the-market program. Of the total 71 million shares reserved, there were 13 million shares of common stock remaining available for awards under the Omnibus Incentive Compensation Plan as of December 31, 2017.
Stock-Based Compensation
Stock-based compensation primarily in the form of performance share units and restricted stock units may be granted through the Omnibus Incentive Compensation Plan to a large segment of Southern Company system employees ranging from line management to executives. In 2015 and 2016, stock-based compensation consisted exclusively of performance share units. Beginning in 2017, stock-based compensation granted to employees includes restricted stock units in addition to performance
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Southern Company and Subsidiary Companies 2017 Annual Report

share units. Prior to 2015, stock-based compensation also included stock options. As of December 31, 2017, there were 5,112 current and former employees participating in the stock option, performance share unit, and restricted stock unit programs.
In conjunction with the Merger, stock-based compensation in the form of Southern Company restricted stock and performance share units was also granted to certain executives of Southern Company Gas through the Southern Company Omnibus Incentive Compensation Plan.
Performance Share Units
Performance share units granted to employees vest at the end of a three-year performance period. All unvested performance share units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of performance share units granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company issues performance share units with performance goals based on three performance goals to employees. These include performance share units with performance goals based on the total shareholder return (TSR) for Southern Company common stock during the three-year performance period as compared to a group of industry peers, performance share units with performance goals based on Southern Company's cumulative earnings per share (EPS) over the performance period, and performance share units with performance goals based on Southern Company's equity-weighted ROE over the performance period.
In 2015 and 2016, the EPS-based and ROE-based awards each represented 25% of the total target grant date fair value of the performance share unit awards granted. The remaining 50% of the total target grant date fair value consisted of TSR-based awards. Beginning in 2017, the total target grant date fair value of the stock compensation awards granted was comprised 20% each of EPS-based awards and ROE-based awards and 30% each of TSR-based awards and restricted stock units.
The fair value of TSR-based performance share unit awards is determined as of the grant date using a Monte Carlo simulation model to estimate the TSR of Southern Company's common stock among the industry peers over the performance period. Southern Company recognizes compensation expense on a straight-line basis over the three-year performance period without remeasurement.
The fair values of the EPS-based awards and the ROE-based awards are based on the closing stock price of Southern Company common stock on the date of the grant. Compensation expense for the EPS-based and ROE-based awards is generally recognized ratably over the three-year performance period initially assuming a 100% payout at the end of the performance period. Employees become immediately vested in the TSR-based performance share units, along with the EPS-based and ROE-based awards, upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. The expected payout related to the EPS-based and ROE-based awards is reevaluated annually with expense recognized to date increased or decreased based on the number of shares currently expected to be issued. Unlike the TSR-based awards, the compensation expense ultimately recognized for the EPS-based awards and the ROE-based awards will be based on the actual number of shares issued at the end of the performance period.
In determining the fair value of the TSR-based awards issued to employees, the expected volatility is based on the historical volatility of Southern Company's stock over a period equal to the performance period. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant that covers the performance period of the awards. The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of performance share award units granted:
Year Ended December 312017 2016 2015
Expected volatility15.6% 15.0% 12.9%
Expected term (in years)
3 3 3
Interest rate1.4% 0.8% 1.0%
Weighted average grant-date fair value$49.08 $45.06 $46.38
The weighted average grant-date fair value of both EPS-based and ROE-based performance share units granted during 2017, 2016, and 2015 was $49.21, $48.87, and $47.75, respectively.
Total unvested performance share units outstanding as of December 31, 2016 were 3.2 million. During 2017, 1.2 million performance share units were granted and 1.5 million performance share units were vested or forfeited, resulting in 2.9 million
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Southern Company and Subsidiary Companies 2017 Annual Report

unvested performance share units outstanding at December 31, 2017. The number of shares to be issued for the three-year performance and vesting period ended December 31, 2017 will be determined in the first quarter 2018.
For the years ended December 31, 2017, 2016, and 2015, total compensation cost for performance share units recognized in income was $74 million, $96 million, and $88 million, respectively, with the related tax benefit also recognized in income of $29 million, $37 million, and $34 million, respectively. As of December 31, 2017, $30 million of total unrecognized compensation cost related to performance share award units will be recognized over a weighted-average period of approximately 21 months.
Restricted Stock Units
Beginning in 2017, stock-based compensation granted to employees included restricted stock units in addition to performance share units. One-third of the restricted stock units granted to employees vest each year throughout a three-year service period. All unvested restricted stock units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the vesting period.
The fair value of restricted stock units is based on the closing stock price of Southern Company common stock on the date of the grant. Since one-third of the restricted stock units vest each year throughout a three-year service period, compensation expense for restricted stock unit awards is generally recognized over the corresponding one-, two-, or three-year period. Employees become immediately vested in the restricted stock units upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility.
The weighted average grant-date fair value of restricted stock units granted during 2017 was $49.25.
During 2017, 0.6 million restricted stock units were granted and 0.1 million restricted stock units were vested or forfeited, resulting in 0.7 million unvested restricted stock units outstanding at December 31, 2017, including previously issued restricted stock units related to other employee retention agreements.
For the year ended December 31, 2017, total compensation cost for restricted stock units recognized in income was $25 million with the related tax benefit also recognized in income of $10 million. As of December 31, 2017, $8 million of total unrecognized compensation cost related to restricted stock units will be recognized over a weighted-average period of approximately 13 months.
Stock Options
In 2015, Southern Company discontinued the granting of stock options and all outstanding options have vested. Stock options expire no later than 10 years after the grant date and the latest possible exercise will occur no later than November 2024.
Southern Company's activity in the stock option program for 2017 is summarized below:
 Shares Subject to Option Weighted Average Exercise Price
 (in millions)  
Outstanding at December 31, 201624.6
 $41.28
Exercised6.0
 40.03
Cancelled
 39.90
Outstanding and Exercisable at December 31, 201718.6
 $41.68
As of December 31, 2017, the weighted average remaining contractual term for the options outstanding and options exercisable was approximately five years and the aggregate intrinsic value for the options outstanding and options exercisable was $119 million.
Total compensation cost for stock option awards and the related tax benefits recognized in income were immaterial for all years presented.
The total intrinsic value of options exercised during the years ended December 31, 2017, 2016, and 2015 was $64 million, $120 million, and $48 million, respectively. The actual tax benefit for the tax deductions from stock option exercises totaled $25 million, $46 million, and $19 million for the years ended December 31, 2017, 2016, and 2015, respectively. Prior to the adoption of ASU 2016-09, the excess tax benefits related to the exercise of stock options were recognized in Southern Company's financial statements with a credit to equity. Upon the adoption of ASU 2016-09, beginning in 2016, all tax benefits related to the exercise of stock options are recognized in income.
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Southern Company and Subsidiary Companies 2017 Annual Report

Southern Company has a policy of issuing shares to satisfy share option exercises. Cash received from issuances related to option exercises under the share-based payment arrangements for the years ended December 31, 2017, 2016, and 2015 was $239 million, $448 million, and $154 million, respectively.
Southern Company Gas Restricted Stock Awards
At the effective time of the Merger, each outstanding award of existing Southern Company Gas performance share units was converted into an award of Southern Company's restricted stock units. Under the terms of the restricted stock awards, the employees received Southern Company stock when they satisfy the requisite service period by being continuously employed through the original three-year vesting schedule of the award being replaced. Southern Company issued 0.7 million restricted stock units with a grant-date fair value of $53.83, based on the closing stock price of Southern Company common stock on the date of the grant. As a portion of the fair value of the award related to pre-combination service, the grant date fair value was allocated to pre- or post-combination service and accounted for as Merger consideration or compensation cost, respectively. Approximately $13 million of the grant date fair value was allocated to Merger consideration.
For the years ended December 31, 2017 and 2016, total compensation cost for restricted stock units recognized in income was $8 million and $13 million, respectively, and the related tax benefit also recognized in income was $4 million for each year. As of December 31, 2017, $3 million of total unrecognized compensation cost related to restricted stock units will be recognized over a weighted-average period of approximately 12 months.
Southern Company Gas Change in Control Awards
Southern Company awarded performance share units to certain Southern Company Gas employees who continued their employment with the Southern Company in lieu of certain change in control benefits the employee was entitled to receive following the Merger (change in control awards). Shares of Southern Company common stock and/or cash equal to the dollar value of the change in control benefit will vest and be issued one-third each year as long as the employee remains in service with Southern Company or its subsidiaries at each vest date. In addition to the change in control benefit, Southern Company common stock could be issued to the employees at the end of a performance period based on achievement of certain Southern Company common stock price metrics, as well performance goals established by the Compensation Committee of the Southern Company Board of Directors (achievement shares).
The change in control benefits are accounted for as a liability award with the fair value equal to the guaranteed dollar value of the change in control benefit. The grant-date fair value of the achievement portion of the award was determined using a Monte Carlo simulation model to estimate the number of achievement shares expected to vest based on the Southern Company common stock price. The expected payout is reevaluated annually with expense recognized to date increased or decreased proportionately based on the expected performance. The compensation expense ultimately recognized for the achievement shares will be based on the actual performance.
For the years ended December 31, 2017 and 2016, total compensation cost for the change in control awards recognized in income was $12 million and $4 million, respectively. The related tax benefit also recognized in income was $6 million for the year ended December 31, 2017 and an immaterial amount for the year ended December 31, 2016. As of December 31, 2017, approximately $8 million of total unrecognized compensation cost related to change in control awards will be recognized over a weighted-average period of approximately 18 months.
Diluted Earnings Per Share
For Southern Company, the only difference in computing basic and diluted EPS is attributable to awards outstanding under the stock option and performance share plans. The effect of both stock options and performance share award units was determined using the treasury stock method. Shares used to compute diluted EPS were as follows:
 Average Common Stock Shares
 2017 2016 2015
 (in millions)
As reported shares1,000
 951
 910
Effect of options and performance share award units8
 7
 4
Diluted shares1,008
 958
 914
Prior to the adoption of ASU 2016-09 in 2016, the effect of options and performance share award units included the assumed impacts of any excess tax benefits from the exercise of all "in the money" outstanding share based awards. Stock options and
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performance share award units that were not included in the diluted EPS calculation because they were anti-dilutive were immaterial in all years presented.
Common Stock Dividend Restrictions
The income of Southern Company is derived primarily from equity in earnings of its subsidiaries. At December 31, 2017, consolidated retained earnings included $5.3 billion of undistributed retained earnings of the subsidiaries.
9. NUCLEAR INSURANCE
Under the Price-Anderson Amendments Act (Act), Alabama Power and Georgia Power maintain agreements of indemnity with the NRC that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at the companies' nuclear power plants. The Act provides funds up to $13.4 billion for public liability claims that could arise from a single nuclear incident. Each nuclear plant is insured against this liability to a maximum of $450 million by American Nuclear Insurers (ANI), with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. A company could be assessed up to $127 million per incident for each licensed reactor it operates but not more than an aggregate of $19 million per incident to be paid in a calendar year for each reactor. Such maximum assessment, excluding any applicable state premium taxes, for Alabama Power and Georgia Power, based on its ownership and buyback interests in all licensed reactors, is $255 million and $247 million, respectively, per incident, but not more than an aggregate of $38 million and $37 million, respectively, per company to be paid for each incident in any one year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years. The next scheduled adjustment is due no later than September 10, 2018. See Note 4 for additional information on joint ownership agreements.
Alabama Power and Georgia Power are members of Nuclear Electric Insurance Limited (NEIL), a mutual insurer established to provide property damage insurance in an amount up to $1.5 billion for members' operating nuclear generating facilities. Additionally, both companies have NEIL policies that currently provide decontamination, excess property insurance, and premature decommissioning coverage up to $1.25 billion for nuclear losses and policies providing coverage up to $750 million for non-nuclear losses in excess of the $1.5 billion primary coverage.
NEIL also covers the additional costs that would be incurred in obtaining replacement power during a prolonged accidental outage at a member's nuclear plant. Members can purchase this coverage, subject to a deductible waiting period of up to 26 weeks, with a maximum per occurrence per unit limit of $490 million. After the deductible period, weekly indemnity payments would be received until either the unit is operational or until the limit is exhausted. Alabama Power and Georgia Power each purchase limits based on the projected full cost of replacement power, subject to ownership limitations. Each facility has elected a 12-week deductible waiting period.
A builders' risk property insurance policy has been purchased from NEIL for the construction of Plant Vogtle Units 3 and 4. This policy provides the Vogtle Owners up to $2.75 billion for accidental property damage occurring during construction.
Under each of the NEIL policies, members are subject to assessments each year if losses exceed the accumulated funds available to the insurer. The maximum annual assessments for Alabama Power and Georgia Power as of December 31, 2017 under the NEIL policies would be $55 million and $81 million, respectively.
Claims resulting from terrorist acts are covered under both the ANI and NEIL policies (subject to normal policy limits). The aggregate, however, that NEIL will pay for all claims resulting from terrorist acts in any 12-month period is $3.2 billion plus such additional amounts NEIL can recover through reinsurance, indemnity, or other sources.
For all on-site property damage insurance policies for commercial nuclear power plants, the NRC requires that the proceeds of such policies shall be dedicated first for the sole purpose of placing the reactor in a safe and stable condition after an accident. Any remaining proceeds are to be applied next toward the costs of decontamination and debris removal operations ordered by the NRC, and any further remaining proceeds are to be paid either to the applicable company or to its debt trustees as may be appropriate under the policies and applicable trust indentures. In the event of a loss, the amount of insurance available might not be adequate to cover property damage and other expenses incurred. Uninsured losses and other expenses, to the extent not recovered from customers, would be borne by Alabama Power or Georgia Power, as applicable, and could have a material effect on Southern Company's financial condition and results of operations.
All retrospective assessments, whether generated for liability, property, or replacement power, may be subject to applicable state premium taxes.
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Southern Company and Subsidiary Companies 2017 Annual Report

10. FAIR VALUE MEASUREMENTS
Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement.
Level 1 consists of observable market data in an active market for identical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.
Level 3 consists of unobservable market data. The input may reflect the assumptions of the Company of what a market participant would use in pricing an asset or liability. If there is little available market data, then the Company's own assumptions are the best available information.
In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the level in the fair value hierarchy in which the fair value measurement is reported.
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Southern Company and Subsidiary Companies 2017 Annual Report

As of December 31, 2017, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets  Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Energy-related derivatives(a)(b)
$331
 $239
 $
 $
 $570
Interest rate derivatives
 1
 
 
 1
Foreign currency derivatives
 129
 
 
 129
Nuclear decommissioning trusts:(c)
         
Domestic equity690
 82
 
 
 772
Foreign equity62
 224
 
 
 286
U.S. Treasury and government agency securities
 251
 
 
 251
Municipal bonds
 68
 
 
 68
Corporate bonds21
 315
 
 
 336
Mortgage and asset backed securities
 57
 
 
 57
Private equity
 
 
 29
 29
Other19
 12
 
 
 31
Cash equivalents1,455
 
 
 
 1,455
Other investments9
 
 1
 
 10
Total$2,587
 $1,378
 $1
 $29
 $3,995
Liabilities:         
Energy-related derivatives(a)(b)
$480
 $253
 $
 $
 $733
Interest rate derivatives
 38
 
 
 38
Foreign currency derivatives
 23
 
 
 23
Contingent consideration
 
 22
 
 22
Total$480
 $314
 $22
 $
 $816
(a)Energy-related derivatives exclude $11 million associated with premiums and certain weather derivatives accounted for based on intrinsic value rather than fair value.
(b)Energy-related derivatives exclude cash collateral of $193 million.
(c)
Includes the investment securities pledged to creditors and collateral received, and excludes receivables related to investment income, pending investment sales, currencies, and payables related to pending investment purchases and the securities lending program. See Note 1 under "Nuclear Decommissioning" for additional information.
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Southern Company and Subsidiary Companies 2017 Annual Report

As of December 31, 2016, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Energy-related derivatives(a)(b)
$338
 $333
 $
 $
 $671
Interest rate derivatives
 14
 
 
 14
Nuclear decommissioning trusts:(c)
         
Domestic equity589
 73
 
 
 662
Foreign equity48
 168
 
 
 216
U.S. Treasury and government agency securities
 92
 
 
 92
Municipal bonds
 73
 
 
 73
Corporate bonds22
 310
 
 
 332
Mortgage and asset backed securities
 183
 
 
 183
Private equity
 
 
 20
 20
Other11
 15
 
 
 26
Cash equivalents1,172
 
 
 
 1,172
Other investments9
 
 1
 
 10
Total$2,189
 $1,261
 $1
 $20
 $3,471
Liabilities:         
Energy-related derivatives(a)(b)
$345
 $285
 $
 $
 $630
Interest rate derivatives
 29
 
 
 29
Foreign currency derivatives
 58
 
 
 58
Contingent consideration
 
 18
 
 18
Total$345
 $372
 $18
 $
 $735
(a)Energy-related derivatives exclude $4 million associated with certain weather derivatives accounted for based on intrinsic value rather than fair value.
(b)Energy-related derivatives exclude cash collateral of $62 million.
(c)
Includes the investment securities pledged to creditors and collateral received, and excludes receivables related to investment income, pending investment sales, currencies, and payables related to pending investment purchases and the securities lending program. See Note 1 under "Nuclear Decommissioning" for additional information.
Valuation Methodologies
The energy-related derivatives primarily consist of exchange-traded and over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The fair value of cross-currency swaps reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future foreign currency exchange rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are
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Southern Company and Subsidiary Companies 2017 Annual Report

categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 11 for additional information on how these derivatives are used.
The NRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. For fair value measurements of the investments within the nuclear decommissioning trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available. See Note 1 under "Nuclear Decommissioning" for additional information.
Southern Power has contingent payment obligations related to certain acquisitions whereby Southern Power is primarily obligated to make generation-based payments to the seller commencing at the commercial operation date through 2026. The obligation is categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facility generation in MW-hours, as well as other inputs such as a fixed dollar amount per MW-hour, and a discount rate, and is evaluated periodically. The fair value of contingent consideration reflects the net present value of expected payments and any periodic change arising from forecasted generation is expected to be immaterial.
"Other investments" include investments that are not traded in the open market. The fair value of these investments has been determined based on market factors including comparable multiples and the expectations regarding cash flows and business plan executions.
As of December 31, 2017 and 2016, the fair value measurements of private equity investments held in the nuclear decommissioning trust that are calculated at net asset value per share (or its equivalent) as a practical expedient, as well as the nature and risks of those investments, were as follows:
 Fair
Value
 Unfunded
Commitments
 Redemption
Frequency
 Redemption 
Notice Period 
 (in millions)



As of December 31, 2017$29

$21

Not Applicable
Not Applicable
As of December 31, 2016$20
 $25
 Not Applicable Not Applicable
Private equity funds include a fund-of-funds that invests in high-quality private equity funds across several market sectors, funds that invest in real estate assets, and a fund that acquires companies to create resale value. Private equity funds do not have redemption rights. Distributions from these funds will be received as the underlying investments in the funds are liquidated. Liquidations are expected to occur at various times over the next 10 years.
As of December 31, 2017 and 2016, other financial instruments for which the carrying amount did not equal fair value were as follows:
 
Carrying
Amount
 
Fair
Value
 (in millions)
Long-term debt, including securities due within one year:   
2017$48,151
 $51,348
2016$45,080
 $46,286
The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on the current rates available to Southern Company, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power, and Southern Company Gas.
11. DERIVATIVES
The Southern Company system is exposed to market risks, including commodity price risk, interest rate risk, weather risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, each company nets its
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Southern Company and Subsidiary Companies 2017 Annual Report

exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to each company's policies in areas such as counterparty exposure and risk management practices. Southern Company Gas' wholesale gas operations use various contracts in its commercial activities that generally meet the definition of derivatives. For the traditional electric operating companies, Southern Power, and Southern Company Gas' other businesses, each company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 10 for additional information. In the statements of cash flows, the cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities. The cash impacts of settled foreign currency derivatives are classified as operating or financing activities to correspond with classification of the hedged interest or principal, respectively. See Note 1 under "Financial Instruments" for additional information.
Energy-Related Derivatives
Southern Company and certain subsidiaries enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and natural gas distribution utilities have limited exposure to market volatility in energy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas distribution utilities manage fuel-hedging programs, implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which is expected to continue to mitigate price volatility. The traditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because their long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, the traditional electric operating companies and Southern Power may be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, adversely affect results of operations.
Southern Company Gas also enters into weather derivative contracts as economic hedges of adjusted operating margins in the event of warmer-than-normal weather. Exchange-traded options are carried at fair value, with changes reflected in operating revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are reflected in the statements of income.
Energy-related derivative contracts are accounted for under one of three methods:
Regulatory Hedges – Energy-related derivative contracts which are designated as regulatory hedges relate primarily to the traditional electric operating companies' and natural gas distribution utilities' fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through the respective fuel cost recovery clauses.
Cash Flow Hedges – Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales) are initially deferred in OCI before being recognized in the statements of income in the same period as the hedged transactions are reflected in earnings.
Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred.
Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric and natural gas industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.
At December 31, 2017, the net volume of energy-related derivative contracts for natural gas positions totaled 621 million mmBtu for the Southern Company system, with the longest hedge date of 2021 over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date of 2026 for derivatives not designated as hedges.
In addition to the volumes discussed above, the traditional electric operating companies and Southern Power enter into physical natural gas supply contracts that provide the option to sell back excess gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 32 million mmBtu.
The estimated pre-tax gains (losses) related to energy-related derivatives that will be reclassified from accumulated OCI to earnings for the 12-month period ending December 31, 2018 total $(11) million for Southern Company.
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Southern Company and Subsidiary Companies 2017 Annual Report

Interest Rate Derivatives
Southern Company and certain subsidiaries may also enter into interest rate derivatives to hedge exposure to changes in interest rates. The derivatives employed as hedging instruments are structured to minimize ineffectiveness. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or losses is recorded in OCI and is reclassified into earnings at the same time the hedged transactions affect earnings, with any ineffectiveness recorded directly to earnings. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings, providing an offset, with any difference representing ineffectiveness. Fair value gains or losses on derivatives that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred.
At December 31, 2017, the following interest rate derivatives were outstanding:

Notional
Amount

Interest
Rate
Received

Weighted Average Interest
Rate Paid

Hedge
Maturity
Date

Fair Value
Gain (Loss) December 31, 2017

(in millions)






(in millions)
Cash Flow Hedges of Existing Debt








$900

1-month LIBOR
0.79%
March 2018
$1
Fair Value Hedges of Existing Debt







 250
 5.40% 3-month LIBOR + 4.02% June 2018 
 500
 1.95% 3-month LIBOR + 0.76% December 2018 (3)
 200
 4.25% 3-month LIBOR + 2.46% December 2019 (1)
 300
 2.75% 3-month LIBOR + 0.92% June 2020 (2)
 1,500
 2.35% 1-month LIBOR + 0.87% July 2021 (31)
Total$3,650







$(36)
The estimated pre-tax gains (losses) related to interest rate derivatives expected to be reclassified from accumulated OCI to interest expense for the next 12-month period ending December 31, 2018 total $(20) million. Deferred gains and losses are expected to be amortized into earnings through 2046.
Foreign Currency Derivatives
Southern Company and certain subsidiaries may also enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or losses is recorded in OCI and is reclassified into earnings at the same time that the hedged transactions affect earnings, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Any ineffectiveness is recorded directly to earnings. The derivatives employed as hedging instruments are structured to minimize ineffectiveness.
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Southern Company and Subsidiary Companies 2017 Annual Report

At December 31, 2017, the following foreign currency derivatives were outstanding:
 Pay NotionalPay RateReceive NotionalReceive RateHedge
Maturity Date
Fair Value
Gain (Loss) at December 31, 2017
 (in millions) (in millions)  (in millions)
Cash Flow Hedges of Existing Debt     

$677
2.95%600
1.00%June 2022$55

564
3.78%500
1.85%June 202651
Total$1,241
 1,100
  $106
The estimated pre-tax gains (losses) related to foreign currency derivatives that will be reclassified from accumulated OCI to earnings for the next 12-month period ending December 31, 2018 total $(23) million.
Derivative Financial Statement Presentation and Amounts
Southern Company and its subsidiaries enter into derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Southern Company and certain subsidiaries also utilize master netting agreements to mitigate exposure to counterparty credit risk. These agreements may contain provisions that permit netting across product lines and against cash collateral. Fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

At December 31, 2017 and 2016, the fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected in the balance sheets as follows:
 2017 2016
Derivative Category and Balance Sheet LocationAssetsLiabilities AssetsLiabilities
 (in millions)
Derivatives designated as hedging instruments for regulatory purposes     
Energy-related derivatives:     
Other current assets/Other current liabilities$10
$43
 $73
$27
Other deferred charges and assets/Other deferred credits and liabilities7
24
 25
33
Total derivatives designated as hedging instruments for regulatory purposes$17
$67
 $98
$60
Derivatives designated as hedging instruments in cash flow and fair value hedges     
Energy-related derivatives:     
Other current assets/Other current liabilities$3
$14
 $23
$7
Interest rate derivatives:     
Other current assets/Other current liabilities1
4
 12
1
Other deferred charges and assets/Other deferred credits and liabilities
34
 1
28
Foreign currency derivatives:     
Other current assets/Other current liabilities
23
 
25
Other deferred charges and assets/Other deferred credits and liabilities129

 
33
Total derivatives designated as hedging instruments in cash flow and fair value hedges$133
$75
 $36
$94
Derivatives not designated as hedging instruments     
Energy-related derivatives:     
Other current assets/Other current liabilities$380
$437
 $489
$483
Other deferred charges and assets/Other deferred credits and liabilities170
215
 66
81
Interest rate derivatives:     
Other current assets/Other current liabilities

 1

Total derivatives not designated as hedging instruments$550
$652
 $556
$564
Gross amounts recognized$700
$794
 $690
$718
Gross amounts offset(a)
$(405)$(598) $(462)$(524)
Net amounts recognized in the Balance Sheets(b)
$295
$196
 $228
$194
(a)Gross amounts offset include cash collateral held on deposit in broker margin accounts of $193 million and $62 million as of December 31, 2017 and 2016, respectively.
(b)Net amounts of derivative instruments outstanding exclude premiums and intrinsic value associated with weather derivatives of $11 million as of December 31, 2017.
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual Report

At December 31, 2017 and 2016, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivatives designated as regulatory hedging instruments and deferred were as follows:
 Unrealized Losses Unrealized Gains
Derivative CategoryBalance Sheet Location2017 2016 Balance Sheet Location2017 2016
  (in millions)  (in millions)
Energy-related derivatives:Other regulatory assets, current$(34) $(16) Other regulatory liabilities, current$7
 $56
 Other regulatory assets, deferred(18) (19) Other regulatory liabilities, deferred1
 12
Total energy-related derivative gains (losses)(*)
 $(52) $(35)  $8
 $68
(*)Fair value gains and losses recorded in regulatory assets and liabilities include cash collateral held on deposit in broker margin accounts of $6 million and $8 million as of December 31, 2017 and 2016, respectively.
For the years ended December 31, 2017, 2016, and 2015, the pre-tax effects of energy-related derivatives, interest rate derivatives, and foreign currency derivatives designated as cash flow hedging instruments on the statements of income were as follows:
Derivatives in Cash Flow Hedging RelationshipsGain (Loss) Recognized in OCI on Derivative (Effective Portion)
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)

Amount
 Amount
Derivative Category2017
2016
2015
Statements of Income Location2017
2016
2015
 (in millions)
 (in millions)
Energy-related derivatives$(47)
$18

$

Depreciation and amortization$(16)
$2

$










Cost of natural gas(2)
(1)

Interest rate derivatives(2)
(180)
(22)
Interest expense, net of amounts capitalized(21)
(18)
(9)
Foreign currency derivatives140

(58)


Interest expense, net of amounts capitalized(23)
(13)











Other income (expense), net(*)
160

(82)

Total$91

$(220)
$(22)

$98

$(112)
$(9)
(*)The reclassification from accumulated OCI into other income (expense), net completely offsets currency gains and losses arising from changes in the U.S. currency exchange rates used to record euro-denominated notes.
There was no material ineffectiveness recorded in earnings for any period presented.
For the years ended December 31, 2017, 2016, and 2015, the pre-tax effects of interest rate derivatives designated as fair value hedging instruments were as follows:
Derivatives in Fair Value Hedging Relationships
Gain (Loss)
Derivative CategoryStatements of Income Location2017 2016 2015
  (in millions)
Interest rate derivatives:Interest expense, net of amounts capitalized$(22) $(21) $2
For all years presented, the pre-tax effects of interest rate derivatives designated as fair value hedging instruments were offset by changes to the carrying value of long-term debt.
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Southern Company and Subsidiary Companies 2017 Annual Report

For the years ended December 31, 2017, 2016, and 2015, the pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income were as follows:
Derivatives Not Designated as Hedging Instruments
Unrealized Gain (Loss) Recognized in Income


Amount
Derivative CategoryStatements of Income Location2017
2016
2015


(in millions)
Energy-related derivativesWholesale electric revenues$(4)
$2

$(5)

Fuel



3

Natural gas revenues(*)
(80)
33



Cost of natural gas(2)
3


Total
$(86)
$38

$(2)
(*)Excludes gains (losses) recorded in natural gas revenues associated with weather derivatives of $23 million and $6 million for the years ended December 31, 2017 and 2016, respectively.
For the years ended December 31, 2017, 2016, and 2015, the pre-tax effects of interest rate derivatives not designated as hedging instruments were immaterial.
Contingent Features
The Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain Southern Company subsidiaries. At December 31, 2017, the Company had no collateral posted with derivative counterparties to satisfy these arrangements.
At December 31, 2017, the fair value of energy-related and interest rate derivative liabilities with contingent features was $15 million and $7 million, respectively. The maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were $14 million and $7 million for energy-related and interest rate derivative contracts, respectively.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. If collateral is required, fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty.
The Southern Company system maintains accounts with certain regional transmission organizations to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, the Company may be required to post collateral. At December 31, 2017, cash collateral posted in these accounts was immaterial. Southern Company Gas maintains accounts with brokers or the clearing houses of certain exchanges to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, Southern Company may be required to deposit cash into these accounts. At December 31, 2017, cash collateral held on deposit in broker margin accounts was $193 million.
Southern Company is exposed to losses related to financial instruments in the event of counterparties' nonperformance. Southern Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. Southern Company has also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate Southern Company's exposure to counterparty credit risk. Southern Company may require counterparties to pledge additional collateral when deemed necessary.
In addition, Southern Company Gas conducts credit evaluations and obtains appropriate internal approvals for the counterparty's line of credit before any transaction with the counterparty is executed. In most cases, the counterparty must have an investment grade rating, which includes a minimum long-term debt rating of Baa3 from Moody's and BBB- from S&P. Generally, Southern Company Gas requires credit enhancements by way of a guaranty, cash deposit, or letter of credit for transaction counterparties that do not have investment grade ratings.
Southern Company Gas also utilizes master netting agreements whenever possible to mitigate exposure to counterparty credit risk. When Southern Company Gas is engaged in more than one outstanding derivative transaction with the same counterparty
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Southern Company and Subsidiary Companies 2017 Annual Report

and it also has a legally enforceable netting agreement with that counterparty, the "net" mark-to-market exposure represents the netting of the positive and negative exposures with that counterparty and a reasonable measure of Southern Company Gas' credit risk. Southern Company Gas also uses other netting agreements with certain counterparties with whom it conducts significant transactions. Master netting agreements enable Southern Company Gas to net certain assets and liabilities by counterparty. Southern Company Gas also nets across product lines and against cash collateral provided the master netting and cash collateral agreements include such provisions. Southern Company Gas may require counterparties to pledge additional collateral when deemed necessary.
Southern Company does not anticipate a material adverse effect on the financial statements as a result of counterparty nonperformance.
12. ACQUISITIONS AND DISPOSITIONS
Southern Company
Merger with Southern Company Gas
Southern Company Gas is an energy services holding company whose primary business is the distribution of natural gas through the natural gas distribution utilities. On July 1, 2016, Southern Company completed the Merger for a total purchase price of approximately $8.0 billion and Southern Company Gas became a wholly-owned, direct subsidiary of Southern Company.
The Merger was accounted for using the acquisition method of accounting with the assets acquired and liabilities assumed recognized at fair value as of the acquisition date. The following table presents the final purchase price allocation:
Southern Company Gas Purchase Price 
 (in millions)
Current assets$1,557
Property, plant, and equipment10,108
Goodwill5,967
Intangible assets400
Regulatory assets1,118
Other assets229
Current liabilities(2,201)
Other liabilities(4,742)
Long-term debt(4,261)
Noncontrolling interest(174)
Total purchase price$8,001
The excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed of $6.0 billion is recognized as goodwill, which is primarily attributable to positioning the Southern Company system to provide natural gas infrastructure to meet customers' growing energy needs and to compete for growth across the energy value chain. Southern Company anticipates that much of the value assigned to goodwill will not be deductible for tax purposes.
The valuation of identifiable intangible assets included customer relationships, trade names, and storage and transportation contracts with estimated lives of one to 28 years. The estimated fair value measurements of identifiable intangible assets were primarily based on significant unobservable inputs (Level 3).
The results of operations for Southern Company Gas have been included in Southern Company's consolidated financial statements from the date of acquisition and consist of operating revenues of $3.9 billion and $1.7 billion and net income of $243 million and $114 million for 2017 and 2016, respectively.
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Southern Company and Subsidiary Companies 2017 Annual Report

The following summarized unaudited pro forma consolidated statement of earnings information assumes that the acquisition of Southern Company Gas was completed on January 1, 2015. The summarized unaudited pro forma consolidated statement of earnings information includes adjustments for (i) intercompany sales, (ii) amortization of intangible assets, (iii) adjustments to interest expense to reflect current interest rates on Southern Company Gas debt and additional interest expense associated with borrowings by Southern Company to fund the Merger, and (iv) the elimination of nonrecurring expenses associated with the Merger.
 20162015
   
Operating revenues (in millions)$21,791
$21,430
Net income attributable to Southern Company (in millions)$2,591
$2,665
Basic EPS$2.70
$2.85
Diluted EPS$2.68
$2.84
These unaudited pro forma results are for comparative purposes only and may not be indicative of the results that would have occurred had this acquisition been completed on January 1, 2015 or the results that would be attained in the future.
Acquisition of PowerSecure
In May 2016, Southern Company acquired all of the outstanding stock of PowerSecure, a provider of products and services in the areas of distributed generation, energy efficiency, and utility infrastructure, for $18.75 per common share in cash, resulting in an aggregate purchase price of $429 million. As a result, PowerSecure became a wholly-owned subsidiary of Southern Company.
The acquisition of PowerSecure was accounted for using the acquisition method of accounting with the assets acquired and liabilities assumed recognized at fair value as of the acquisition date. The following table presents the final purchase price allocation:
PowerSecure Purchase Price 
 (in millions)
Current assets$172
Property, plant, and equipment46
Intangible assets106
Goodwill284
Other assets4
Current liabilities(121)
Long-term debt, including current portion(48)
Deferred credits and other liabilities(14)
Total purchase price$429
The excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed of $284 million was recognized as goodwill, which is primarily attributable to expected business expansion opportunities for PowerSecure. Southern Company anticipates that the majority of the value assigned to goodwill will not be deductible for tax purposes.
The valuation of identifiable intangible assets included customer relationships, trade names, patents, backlog, and software with estimated lives of one to 26 years. The estimated fair value measurements of identifiable intangible assets were primarily based on significant unobservable inputs (Level 3).
The results of operations for PowerSecure have been included in Southern Company's consolidated financial statements from the date of acquisition and are immaterial to the consolidated financial results of Southern Company. Pro forma results of operations have not been presented for the acquisition because the effects of the acquisition were immaterial to Southern Company's consolidated financial results for all periods presented.
Southern Power
During 2017 and 2016, in accordance with its overall growth strategy, Southern Power or one of its wholly-owned subsidiaries, acquired or contracted to acquire the projects discussed below. Also, in March 2016, Southern Power acquired an additional 15% interest in Desert Stateline, 51% of which was initially acquired in 2015. As a result, Southern Power and the class B member are
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Southern Company and Subsidiary Companies 2017 Annual Report

now entitled to 66% and 34%, respectively, of all cash distributions from Desert Stateline. In addition, Southern Power will continue to be entitled to substantially all of the federal tax benefits with respect to the transaction. Acquisition-related costs were expensed as incurred and were not material for any of the years presented.
The following table presents Southern Power's acquisition activity for the year ended, and subsequent to, December 31, 2017.
Project FacilityResourceSeller; Acquisition DateApproximate Nameplate Capacity (MW)LocationSouthern Power Percentage OwnershipActual/Expected CODPPA Contract Period
Business Acquisitions During the Year Ended December 31, 2017
BethelWind
Invenergy Wind Global LLC,
January 6, 2017
276Castro County, TX100% January 201712 years
Cactus Flats(a)
WindRES America Developments, Inc.
July 31, 2017
148Concho County, TX100% Third quarter 201812 years and 15 years
Business Acquisitions Subsequent to December 31, 2017
Gaskell West 1Solar
Recurrent Energy Development Holdings, LLC,
January 26, 2018
20Kern County, CA100% of Class B
(b)March
2018
20 years
(a)On July 31, 2017, Southern Power purchased 100% of the Cactus Flats facility and commenced construction. Upon placing the facility in service, Southern Power expects to close on a tax equity partnership agreement that has already been executed, subject to various customary conditions at closing, and will then own 100% of the class B membership interests.
(b)Southern Power owns 100% of the class B membership interest under a tax equity partnership agreement.
Business Acquisitions During the Year Ended December 31, 2017
Southern Power's aggregate purchase price for acquisitions during the year ended December 31, 2017 was $539 million. The fair values of the assets acquired and liabilities assumed were finalized in 2017 and recorded as follows:
 2017
 (in millions)
Restricted cash$16
CWIP534
Other assets5
Accounts payable(16)
Total purchase price$539
In 2017, total revenues of $15 million and net income of $17 million, primarily as a result of PTCs, was recognized by Southern Power related to the 2017 acquisitions. The Bethel facility did not have operating revenues or activities prior to completion of construction and being placed in service, and the Cactus Flats facility is still under construction. Therefore, supplemental pro forma information as though the acquisitions occurred as of the beginning of 2017 and for the comparable 2016 period is not meaningful and has been omitted.
Construction Projects in Progress
During the year ended December 31, 2017, in accordance with its overall growth strategy, Southern Power continued construction on the 345-MW Mankato expansion project and commenced construction on the Cactus Flats facility. Total aggregate construction costs for these facilities, excluding acquisition costs and including construction costs to complete the subsequently-acquired Gaskell West 1 solar project, are expected to be between $385 million and $430 million. At December 31, 2017, construction costs included in CWIP related to these projects totaled $188 million. The ultimate outcome of these matters cannot be determined at this time.
Development Projects
During 2017, as part of Southern Power's renewable development strategy, Southern Power purchased wind turbine equipment from Siemens Wind Power, Inc. and Vestas-American Wind Technology, Inc. to be used for various development and construction
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Southern Company and Subsidiary Companies 2017 Annual Report

projects, up to 900 MWs in total. Once these wind projects reach commercial operations, which is expected in 2021, they are expected to qualify for 80% PTCs.
During 2016, Southern Power entered into a joint development agreement with Renewable Energy Systems Americas, Inc. to develop and construct approximately 3,000 MWs of wind projects expected to be placed in service between 2018 and 2020. In addition, in 2016, Southern Power purchased wind turbine equipment from Siemens Wind Power, Inc. and Vestas-American Wind Technology, Inc. to be used for construction of the facilities. Once these wind projects reach commercial operations, they are expected to qualify for 100% PTCs.
The ultimate outcome of these matters cannot be determined at this time.
The following table presents Southern Power's acquisitions for the year ended December 31, 2016.
Project FacilityResourceSeller, Acquisition Date
Approximate
Nameplate Capacity (
MW)
 LocationOwnership PercentageActual CODPPA
Contract Period
Acquisitions for the Year Ended December 31, 2016
Boulder 1SolarSunPower
November 16, 2016
100 Clark County, NV51%(a)December 201620 years
CalipatriaSolarSolar Frontier Americas Holding LLC
February 11, 2016
20 Imperial County, CA100%(b)February 201620 years
East PecosSolarFirst Solar, Inc.
March 4, 2016
120 Pecos County, TX100% March 201715 years
Grant PlainsWindApex Clean Energy Holdings, LLC
August 26, 2016
147 Grant County, OK100% December 2016
20 years and 12 years (c)
Grant WindWindApex Clean Energy Holdings, LLC
April 7, 2016
151 Grant County, OK100% April 201620 years
HenriettaSolarSunPower
July 1, 2016
102 Kings County, CA51%(a)July 201620 years
LamesaSolarRES America Developments Inc.
July 1, 2016
102 Dawson County, TX100% April 201715 years
Mankato (d)
Natural GasCalpine Corporation October 26, 2016375 Mankato, MN100% 
N/A (e)
10 years
PassadumkeagWindQuantum Utility Generation, LLC
June 30, 2016
42 Penobscot County, ME100% July 201615 years
RutherfordSolarCypress Creek Renewables, LLC
July 1, 2016
74 Rutherford County, NC100%(b)December 201615 years
Salt ForkWindEDF Renewable Energy, Inc.
December 1, 2016
174 Donley and Gray Counties, TX100% December 201614 years and 12 years
Tyler BluffWindEDF Renewable Energy, Inc.
December 21, 2016
125 Cooke County, TX100% December 201612 years
Wake WindWindInvenergy
October 26, 2016
257 Floyd and Crosby Counties, TX90.1%(f)October 201612 years
(a)Southern Power owns 100% of the class A membership interests and a wholly-owned subsidiary of the seller owns 100% of the class B membership interests. Southern Power and the class B member are entitled to 51% and 49%, respectively, of all cash distributions from the project. In addition, Southern Power is entitled to substantially all of the federal tax benefits with respect to the transaction.
(b)Southern Power originally purchased 90%, with a minority owner owning 10%. During 2017, Southern Power acquired the remaining 10% ownership interest.
(c)In addition to the 20-year and 12-year PPAs, the facility has a 10-year contract with Allianz Risk Transfer (Bermuda) Ltd.
(d)Under the terms of the PPA and the expansion PPA, approximately $442 million of assets, primarily related to property, plant, and equipment, are subject to lien at December 31, 2017.
(e)The acquisition included a fully operational 375-MW natural gas-fired combined-cycle facility.
(f)Southern Power owns 90.1%, with the minority owner, Invenergy Wind Global LLC, owning 9.9%.
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Acquisitions During the Year Ended December 31, 2016
Southern Power's aggregate purchase price for acquisitions during the year ended December 31, 2016 was approximately $2.3 billion. The total aggregate purchase price including minority ownership contributions and the assumption of non-recourse construction debt to Southern Power was approximately $2.6 billion for these acquisitions. In connection with Southern Power's 2016 acquisitions, allocations of the purchase price to individual assets were finalized during the year ended December 31, 2017 with no changes to amounts originally reported for Boulder 1, Grant Plains, Grant Wind, Henrietta, Mankato, Passadumkeag, Salt Fork, Tyler Bluff, and Wake Wind. The fair values of the assets and liabilities acquired through the business combinations were recorded as follows:
 2016
 (in millions)
CWIP$2,354
Property, plant, and equipment302
Intangible assets (a)
128
Other assets52
Accounts payable(16)
Debt(217)
Total purchase price$2,603
  
Funded by: 
Southern Power (b) (c)
$2,345
Noncontrolling interests (d) (e)
258
Total purchase price$2,603
(a)Intangible assets consist of acquired PPAs that will be amortized over 10- and 20-year terms. The estimated amortization for future periods is approximately $9 million per year. See Note 1 for additional information.
(b)At December 31, 2016, $461 million is included in acquisitions payable on the balance sheets.
(c)Includes approximately $281 million of contingent consideration, of which $29 million was payable at December 31, 2017.
(d)Includes approximately $51 million of non-cash contributions recorded as capital contributions from noncontrolling interests in the statements of stockholders' equity.
(e)Includes approximately $142 million of contingent consideration, all of which had been paid at December 31, 2016 by the noncontrolling interests.
Southern Company Gas
Investment in Southern Natural Gas
In September 2016, Southern Company Gas completed its acquisition from Kinder Morgan, Inc. of a 50% equity interest in Southern Natural Gas Company, L.L.C. (SNG), which is the owner of a 7,000-mile pipeline system connecting natural gas supply basins in Texas, Louisiana, Mississippi, and Alabama to markets in Louisiana, Mississippi, Alabama, Florida, Georgia, South Carolina, and Tennessee. The purchase price of the acquisition was approximately $1.4 billion. The investment in SNG is accounted for using the equity method.
Acquisition of Remaining Interest in SouthStar
SouthStar Energy Services, LLC (SouthStar) is a retail natural gas marketer and markets natural gas to residential, commercial, and industrial customers, primarily in Georgia and Illinois. Southern Company Gas previously had an 85% ownership interest in SouthStar, with Piedmont Natural Gas Company, Inc.'s (Piedmont) owning the remaining 15%. In October 2016, Southern Company Gas purchased Piedmont's 15% interest in SouthStar for $160 million.
Proposed Sale of Elizabethtown Gas and Elkton Gas
On October 15, 2017, Southern Company Gas subsidiary, Pivotal Utility Holdings, entered into agreements for the sale of the assets of two of its natural gas distribution utilities, Elizabethtown Gasowns other direct and Elkton Gas, to South Jersey Industries, Inc. for a total cash purchase price of $1.7 billion. The completion of each asset sale is subject to the satisfaction or waiver of certain conditions, including, among other customary closing conditions, the receipt of required regulatory approvals, including the FERC, the Federal Communications Commission, the New Jersey BPU, and, with respect to the sale of Elkton Gas, the Maryland PSC. Southern Company Gas and South Jersey Industries, Inc. made joint filings on December 22, 2017 and January 16, 2018 with the
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New Jersey BPU and the Maryland PSC, respectively, requesting regulatory approval. The asset sales are expected to be completed by the end of the third quarter 2018.
The ultimate outcome of these matters cannot be determined at this time.
13. SEGMENT AND RELATED INFORMATION
indirect subsidiaries. The primary businesses of the Southern Company system are electricity sales by the traditional electric operating companies and Southern Power and the distribution of natural gas by Southern Company Gas. The four traditional electric operating companies – Alabama Power, Georgia Power, Gulf Power, and Mississippi Power – are vertically integrated utilities providing electric service in four Southeastern states. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through the natural gas distribution utilities in seven states and is involved in several other complementary businesses including gas marketing services, wholesale gas services, and gas midstream operations.
Southern Company's reportable business segments are the sale of electricity by the four traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. Revenues from sales by Southern PowerSee Note 16 to the financial statements for additional information.
The traditional electric operating companies were $392 million, $419 million,– Alabama Power, Georgia Power, and $417 millionMississippi Power – are vertically integrated utilities providing electric service to retail customers in 2017, 2016,three Southeastern states in addition to wholesale customers in the Southeast.
Southern Power develops, constructs, acquires, owns, and 2015, respectively. Revenues frommanages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Power continually seeks opportunities to execute its strategy to create value through various transactions including acquisitions, dispositions, and sales of natural gas from partnership interests, development and construction of new generating facilities, and entry into PPAs primarily with investor-owned utilities, IPPs, municipalities, electric cooperatives, and other load-serving entities, as well as commercial and industrial customers. In general, Southern Power commits to the construction or acquisition of new generating capacity only after entering into or assuming long-term PPAs for the new facilities.
Southern Company Gas is an energy services holding company whose primary business is the distribution of natural gas. Southern Company Gas owns natural gas distribution utilities in four states – Illinois, Georgia, Virginia, and Tennessee – and is also involved in several other complementary businesses. Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services, which includes SouthStar, a Marketer and provider of energy-related products and services to natural gas markets – and one non-reportable segment, all other. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' reportable segments also included wholesale gas services. See Notes 7, 15, and 16 to the financial statements for additional information.
Southern Company's other business activities include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications. Management continues to evaluate the contribution of each of these activities to total shareholder return and may pursue acquisitions, dispositions, and other strategic ventures or investments accordingly.
See FUTURE EARNINGS POTENTIAL herein for a discussion of many factors that could impact the Registrants' future results of operations, financial condition, and liquidity.
Recent Developments
Alabama Power
On March 24, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with the acquisition of the Central Alabama Generating Station. The filing reflected an annual increase in retail revenues of $78 million, or 1.1%, effective with June 2023 billings. Through May 2023, Alabama Power recovered substantially all costs associated with the Central Alabama Generating Station through Rate RSE, offset by revenues from a power sales agreement. On May 24, 2023, the Central Alabama Generating Station was placed into retail service. On November 1, 2023, Alabama Power placed Plant Barry Unit 8 in service. On December 1, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with Plant Barry Unit 8. The filing reflected an annual increase in retail revenues of $91 million, or 1.4%, effective with January 2024 billings.
On June 14, 2023, the Alabama PSC issued an order approving modifications to Alabama Power's Renewable Generation Certificate. The modifications authorized Alabama Power to procure an additional 2,400 MWs of renewable capacity and energy by June 14, 2029 and to market the related energy and environmental attributes to customers and other third parties. The modifications also increased the size of allowable renewable projects from 80 MWs to 200 MWs and increased the annual approval limit from 160 MWs to 400 MWs.
On July 11, 2023, the Alabama PSC issued an order authorizing Alabama Power to expand the existing authority of its reliability reserve to include certain production-related expenses that are intended to maintain reliability in between scheduled generating unit maintenance outages.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
On August 18, 2023, Alabama Power notified the Alabama PSC of its intent to use a portion of its reliability reserve balance in 2023. During the fourth quarter 2023, Alabama Power used $75 million of the reliability reserve for reliability-related transmission, distribution, and generation expenses and nuclear production-related expenses. At December 31, 2023, Alabama Power accrued $52 million to its reliability reserve.
On October 3, 2023, the Alabama PSC issued an order modifying its December 2022 order related to excess federal accumulated deferred income taxes and authorizing Alabama Power to (i) flow back in 2023 approximately $24 million of certain federal excess accumulated deferred income taxes resulting from the Tax Cuts and Jobs Act of 2017 and (ii) make available any remaining balance of excess accumulated deferred income taxes at the end of 2023 for the benefit of customers in 2024 and/or 2025. At December 31, 2023, the remaining balance was $81 million, of which approximately $67 million and $14 million will flow back in 2024 and 2025, respectively, for the benefit of customers.
On November 9, 2023, the Alabama PSC approved a decrease to Rate ECR of approximately $126 million annually, effective with December 2023 billings.
On December 1, 2023, Alabama Power submitted calculations to the Alabama PSC for Rate CNP Compliance for 2024, which resulted in an annual revenue decrease of approximately $23 million, or 0.3%, effective with January 2024 billings.
For the year ended December 31, 2023, Alabama Power's weighted common equity return exceeded 6.15%, resulting in Alabama Power establishing a current regulatory liability of $15 million for Rate RSE refunds, which will be refunded to customers through bill credits in April 2024.
See Note 2 to the financial statements under "Alabama Power" for additional information.
Georgia Power
Plant Vogtle Units 3 and 4 Construction and Start-Up Status
Georgia Power placed Plant Vogtle Unit 3 in service on July 31, 2023 and continues construction on Plant Vogtle Unit 4 (each with electric generating capacity of approximately 1,100 MWs), in which it holds a 45.7% ownership interest. Georgia Power's share of the total project capital cost forecast to complete Plant Vogtle Units 3 and 4, including contingency, through the second quarter 2024 is $10.8 billion.
Hot functional testing for Unit 4 was completed on May 1, 2023. On July 20, 2023, Southern Nuclear announced that all Unit 4 ITAACs had been submitted to the NRC, and, on July 28, 2023, the NRC published its 103(g) finding that the accepted criteria in the combined license for Unit 4 had been met, which allowed nuclear fuel to be loaded and start-up testing to begin. Fuel load for Unit 4 was completed on August 19, 2023. On October 6, 2023, Georgia Power announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified a motor fault in one of four reactor coolant pumps (RCPs). This RCP was replaced with an on-site spare RCP from inventory.
On February 1, 2024, Georgia Power announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified, and has remediated, vibrations associated with certain piping within the cooling system. Considering the remaining pre-operational testing, Unit 4 is projected to be placed in service during the second quarter 2024. On February 14, 2024, Unit 4 achieved self-sustaining nuclear fission, commonly referred to as initial criticality. The projected schedule for Unit 4 significantly depends on the progression of start-up and pre-operational testing, which may be impacted by equipment or other operational failures. In addition, any findings related to the root cause of the motor fault on the single Unit 4 RCP could require engineering changes or remediation related to the other seven Unit 3 and Unit 4 RCPs. Any further delays could result in a later in-service date and cost increases.
As of December 31, 2023, based on completion of construction work and the assessment of start-up and pre-operational testing remaining, Southern Nuclear has an estimated $36 million for construction contingency remaining in the estimate to complete. This contingency is projected to be allocated in the future to address any further Unit 4 schedule extensions or remediation of other issues discovered during start-up testing.
In September 2022, Georgia Power and MEAG Power reached an agreement to resolve a dispute regarding the cost-sharing and tender provisions of the Global Amendments (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"). Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project capital cost forecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the current project capital cost forecast, with no further adjustment for force majeure costs.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
On October 5, 2023 and October 17, 2023, Georgia Power reached agreements with OPC and Dalton, respectively, to resolve its respective dispute with each of OPC and Dalton regarding the cost-sharing and tender provisions of the Global Amendments. Under the terms of the agreements with OPC and Dalton, among other items, (i) each of OPC and Dalton retracted its exercise of the tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4, (ii) Georgia Power made payments immediately after execution of the agreements of $308 million and $17 million to OPC and Dalton, respectively, representing payment for a portion of each of OPC's and Dalton's costs of construction for Plant Vogtle Units 3 and 4 previously incurred, (iii) Georgia Power will pay a portion of each of OPC's and Dalton's further costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will be in an aggregate amount of approximately $105 million and $6 million for OPC and Dalton, respectively, based on the current project capital cost forecast, and (iv) Georgia Power will pay 66% of each of OPC's and Dalton's costs of construction with respect to any amounts above the current project capital cost forecast, with no further adjustment for force majeure costs.
Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing provisions of the Global Amendments, including the settlement with MEAG Power. Based on the current project capital cost forecast and the settlements with OPC and Dalton described above, Georgia Power recorded a pre-tax charge to income of approximately $160 million ($120 million after tax) in the third quarter 2023. These charges are included in the total project capital cost forecast and will not be recovered from retail customers.
The ultimate impact of these matters on the construction schedule for Plant Vogtle Unit 4 and project capital cost forecast for Plant Vogtle Units 3 and 4 cannot be determined at this time. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Plant Vogtle Units 3 and 4 Rate and Prudency Proceedings
In compliance with a Georgia PSC order approved in 2021, Georgia Power increased annual retail base rates by $318 million effective August 1, 2023 based on the in-service date of July 31, 2023 for Unit 3.
On December 19, 2023, the Georgia PSC voted to approve the application to adjust rates to include reasonable and prudent Plant Vogtle Units 3 and 4 costs (Application) as modified by the related stipulated agreement (Prudency Stipulation) among Georgia Power, the staff of the Georgia PSC, and certain intervenors.
Under the terms of the approved Prudency Stipulation, Georgia Power will recover $7.562 billion in total construction and capital costs and associated retail rate base items of $1.02 billion, which includes AFUDC financing costs above $4.418 billion (the Georgia PSC-certified amount) up to $7.562 billion. Georgia Power will also recover projected operations and maintenance expenses, depreciation expense, nuclear decommissioning accruals, and property taxes, net of projected PTCs. After considering construction and capital costs already in retail base rates of $2.1 billion and $362 million of associated retail rate base items (approved by the Georgia PSC in 2021) and upon achieving commercial operation of Unit 4, Georgia Power will include in retail rate base the remaining $5.462 billion of construction and capital costs as well as $656 million of associated retail rate base items.
Under the Prudency Stipulation, if commercial operation for Unit 4 is not achieved by March 31, 2024, Georgia Power's ROE used to determine the NCCR tariff and calculate AFUDC will be reduced to zero, which will result in an estimated negative impact to earnings of approximately $30 million per month until the month following the date commercial operation for Unit 4 is achieved. The ultimate outcome of this matter cannot be determined at this time.
Annual retail base revenues will increase approximately $729 million and the average retail base rates will be adjusted by approximately 5% (net of the elimination of the NCCR tariff described above) effective the first day of the month after Unit 4 achieves commercial operation.
The approval of the Application and the Prudency Stipulation resolves all issues for determination by the Georgia PSC regarding the reasonableness, prudence, and cost recovery for the remaining Plant Vogtle Units 3 and 4 construction and capital costs not already in retail base rates.
As a result of the Georgia PSC's approval of the Prudency Stipulation, Georgia Power recorded a pre-tax credit to income of approximately $228 million ($170 million after tax) in the fourth quarter 2023 to recognize CWIP costs previously charged to income, which are now recoverable through retail rates. Associated AFUDC on these costs was also recognized.
See Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Regulatory Matters" for additional information.
Rate Plans
On November 16, 2023, in accordance with the terms of the 2022 ARP, the Georgia PSC approved tariff adjustments effective January 1, 2024 that resulted in a net increase in rates of $191 million.
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Georgia Power expects to submit a compliance filing in the fourth quarter 2024 to request tariff adjustments approved pursuant to the 2022 ARP effective January 1, 2025. The ultimate outcome of this matter cannot be determined at this time.
See Note 2 to the financial statements under "Georgia Power – Rate Plans – 2022 ARP" for additional information.
Fuel Cost Recovery
On May 16, 2023, the Georgia PSC approved a stipulation agreement between Georgia Power and the staff of the Georgia PSC to increase annual fuel billings by 54%, or approximately $1.1 billion, effective June 1, 2023. The increase reflects a three-year recovery period for $2.2 billion of Georgia Power's under recovered fuel balance at May 31, 2023. Changes in fuel rates have no significant effect on Southern Company's or Georgia Power's net income but do impact the related operating cash flows. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Integrated Resource Plans
On October 27, 2023, Georgia Power filed an updated IRP (2023 IRP Update) with the Georgia PSC, which sets forth a plan to support the recent increase in the state of Georgia's projected energy needs since the 2022 IRP. Georgia Power expects the Georgia PSC to render a final decision on the 2023 IRP Update on April 16, 2024. The ultimate outcome of this matter cannot be determined at this time. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Mississippi Power
On October 27, 2023, the FERC approved a settlement agreement filed by Mississippi Power and Cooperative Energy on July 31, 2023 related to Mississippi Power's July 2022 request for a $23 million increase in annual wholesale base revenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and a refund to customers of approximately $6 million primarily related to the difference between the approved rates and interim rates.
In October 2023, Mississippi Power signed an affiliate PPA with Georgia Power for 750 MWs of capacity, which began January 1, 2024 and will continue through December 2028. In order to fulfill this PPA and serve the interests of customers, Mississippi Power now expects electric generating units identified in its 2021 IRP to remain in service beyond the previously indicated dates. Mississippi Power is expected to file its next IRP in April 2024 in accordance with the rules and orders of the Mississippi PSC. The ultimate outcome of this matter cannot be determined at this time.
On February 6, 2024, the Mississippi PSC approved Mississippi Power's request to increase retail fuel revenues by $18 million annually effective with the first billing cycle of March 2024.
On February 12, 2024, Mississippi Power submitted its annual ECO Plan filing to the Mississippi PSC, which requested a $9 million annual increase in revenues. The ultimate outcome of this matter cannot be determined at this time.
See Note 2 to the financial statements under "Mississippi Power" for additional information.
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Southern Power
On September 20, 2023, Southern Power acquired 100% of the membership interests in the 200-MW Millers Branch solar project located in Haskell County, Texas from EDF Renewables Development, Inc. and is continuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to occur in the fourth quarter 2025. The project includes an option to expand capacity up to an additional 300 MWs. Subsequent to December 31, 2023, Southern Power committed to expand the construction of the facility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the second quarter 2026.
On September 22, 2023, Southern Power acquired 100% of the membership interests in the 150-MW South Cheyenne solar project located in Laramie County, Wyoming from Hanwha Q Cells USA Corp. and is continuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to occur in the second quarter 2024.
The ultimate outcome of these matters cannot be determined at this time.
Southern Power calculates an investment coverage ratio for its generating assets, including those owned with various partners, based on the ratio of investment under contract to total investment using the respective facilities' net book value (or expected in-service value for facilities under construction) as the investment amount. With the inclusion of investments associated with facilities under construction, as well as other capacity and energy contracts, Southern Power's average investment coverage ratio at December 31, 2023 was 97% through 2028 and 89% through 2033, with an average remaining contract duration of approximately 12 years.
See Note 15 to the financial statements under "Southern Power" for additional information.
Southern Company Gas
On June 15, 2023, the Illinois Commission concluded its review of the Qualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the second quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an $8 million reduction to revenues and $30 million in estimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a rehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and an equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to be completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the fourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be postponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined in the Illinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to the Illinois Commission's rate case ruling.
Any further cost disallowances by the Illinois Commission in the pending cases could be material to the financial statements of Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
On December 19, 2023, the Georgia PSC approved Atlanta Gas Light's annual GRAM filing, which resulted in an annual base rate increase of $53 million effective January 1, 2024.
On February 1, 2024, Atlanta Gas Light filed its triennial Integrated Capacity and Delivery Plan (i-CDP) with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2025 through 2034), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected
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capital investments totaling approximately $0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order on this matter in the third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
On August 28, 2023, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for a $48 million increase in annual base rate revenues based on a ROE of 9.70% and an equity ratio of 49.06%. Interim rates became effective as of January 1, 2023, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $69 million. Refunds to customers related to the difference between the approved rates effective September 1, 2023 and the interim rates were completed during the fourth quarter 2023.
On February 9, 2024, Virginia Natural Gas filed with the Virginia Commission a request to extend the existing SAVE program through 2029. The request includes investments of $70 million in each year from 2025 through 2029, with a potential variance of up to $5 million allowed for the program, for a maximum total investment over the five-year extension (2025 through 2029) of $355 million. Virginia Natural Gas expects the Virginia Commission to issue a final order on this matter in the second quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Key Performance Indicators
In striving to achieve attractive risk-adjusted returns while providing cost-effective energy to approximately 8.9 million electric and gas utility customers collectively, the traditional electric operating companies and Southern Company Gas continue to focus on several key performance indicators. These indicators include, but are not limited to, customer satisfaction, plant availability, electric and natural gas system reliability, and execution of major construction projects. In addition, Southern Company and the Subsidiary Registrants focus on earnings per share (EPS) and net income, respectively, as a key performance indicator. See RESULTS OF OPERATIONS herein for information on the Registrants' financial performance.
The financial success of the traditional electric operating companies and Southern Company Gas is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. The traditional electric operating companies use customer satisfaction surveys to evaluate their results and generally target the top quartile of these surveys in measuring performance. Reliability indicators are also used to evaluate results. See Note 2 to the financial statements under "Alabama Power – Rate RSE" and "Mississippi Power – Performance Evaluation Plan" for additional information on Alabama Power's Rate RSE and Mississippi Power's PEP rate plan, respectively, both of which contain mechanisms that directly tie customer service indicators to the allowed equity return.
Southern Company Gas also continues to focus on several operating metrics, including Heating Degree Days, customer count, and volumes of natural gas sold. Southern Company Gas measures weather and the effect on its business using Heating Degree Days. Generally, increased Heating Degree Days result in higher demand for natural gas on Southern Company Gas' distribution system. See RESULTS OF OPERATIONS – "Southern Company Gas" for additional information on Southern Company Gas' operating metrics.
Southern Power continues to focus on several key performance indicators, including, but not limited to, the equivalent forced outage rate and contract availability to evaluate operating results and help ensure its ability to meet its contractual commitments to customers.
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RESULTS OF OPERATIONS
Southern Company
Consolidated net income attributable to Southern Company was $4.0 billion in 2023, an increase of $452 million, or 12.8%, from 2022. The increase was primarily due to lower non-fuel operations and maintenance costs, an increase in retail electric revenues associated with rates and pricing, a decrease in income tax expense, a decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, an increase in other revenues, an increase in natural gas revenues from rate increases and continued infrastructure replacement, and a goodwill impairment charge in 2022 at PowerSecure, partially offset by higher depreciation and amortization, higher interest expense, and a decrease in retail electric revenues associated with milder weather in 2023 compared to 2022. See Notes 1 and 2 to the financial statements under "Goodwill and Other Intangible Assets" and "Georgia Power – Nuclear Construction," respectively, for additional information.
Basic EPS was $3.64 in 2023 and $3.28 in 2022. Diluted EPS, which factors in additional shares related to stock-based compensation, was $3.62 in 2023 and $3.26 in 2022. EPS for 2023 and 2022 was negatively impacted by $0.06 and $0.04 per share, respectively, as a result of increases in the average shares outstanding. See Note 8 to the financial statements under "Outstanding Classes of Capital Stock – Southern Company" for additional information.
Dividends paid per share of common stock were $2.78 in 2023 and $2.70 in 2022. In January 2024, Southern Company declared a quarterly dividend of 70 cents per share. For 2023, the dividend payout ratio was 76% compared to 82% for 2022.
Discussion of Southern Company's results of operations is divided into three parts – the Southern Company system's primary business of electricity sales, its gas business, and its other business activities.
20232022
(in millions)
Electricity business$3,994 $3,672 
Gas business615 572 
Other business activities(633)(720)
Net Income$3,976 $3,524 
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Electricity Business
Southern Company's electric utilities generate and sell electricity to retail and wholesale customers. A condensed statement of income for the electricity business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Electric operating revenues$19,998 $(2,875)
Fuel4,365 (2,470)
Purchased power883 (710)
Cost of other sales171 57 
Other operations and maintenance4,679 (550)
Depreciation and amortization3,865 836 
Taxes other than income taxes1,159 34 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total electric operating expenses15,054 (3,054)
Operating income4,944 179 
Allowance for equity funds used during construction247 37 
Interest expense, net of amounts capitalized1,274 207 
Other income (expense), net533 17 
Income taxes583 (265)
Net income3,867 291 
Less:
Dividends on preferred stock of subsidiaries (11)
Net loss attributable to noncontrolling interests(127)(20)
Net Income Attributable to Southern Company$3,994 $322 
Electric Operating Revenues
Electric operating revenues for 2023 were $20.0 billion, reflecting a $2.9 billion, or 12.6%, decrease from 2022. Details of electric operating revenues were as follows:
 20232022
 (in millions)
Retail electric — prior year$18,197 
Estimated change resulting from —
Rates and pricing437 
Sales decline(33)
Weather(229)
Fuel and other cost recovery(2,029)
Retail electric — current year$16,343 $18,197 
Wholesale electric revenues2,467 3,641 
Other electric revenues792 747 
Other revenues396 288 
Electric operating revenues$19,998 $22,873 
Retail electric revenues decreased $1.9 billion, or 10.2%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing in 2023 was primarily due to base tariff increases in accordance with Georgia Power's 2022 ARP, revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed
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retail ROE range, an increase in Rate CNP Compliance revenues at Alabama Power, and a lower Rate RSE customer refund accrual in 2023 compared to 2022 at Alabama Power, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in the revenues recognized under the NCCR tariff, both at Georgia Power.
Electric rates for the traditional electric operating companies include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of PPA costs, and do not affect net income. The traditional electric operating companies each have one or more regulatory mechanisms to recover other costs such as environmental and other compliance costs, storm damage, new plants, and PPA capacity costs.
See Note 2 to the financial statements under "Alabama Power" and "Georgia Power" for additional information. Also see "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Wholesale electric revenues from power sales were as follows:
20232022
 (in millions)
Capacity and other$630 $625 
Energy1,837 3,016
Total$2,467 $3,641 
In 2023, wholesale electric revenues decreased $1.2 billion, or 32.2%, as compared to 2022 primarily due to a decrease in energy revenues. Energy revenues decreased $884 million at Southern Power and $295 million at the traditional electric operating companies primarily due to fuel and purchased power price decreases compared to 2022. Also contributing to the Southern Power decrease was a net decrease in the volume of KWHs sold primarily associated with natural gas PPAs.
Wholesale electric revenues consist of revenues from PPAs and short-term opportunity sales. Wholesale electric revenues from PPAs (other than solar and wind PPAs) have both capacity and energy components. Capacity revenues generally represent the greatest contribution to net income and are designed to provide recovery of fixed costs plus a return on investment. Energy revenues will vary depending on fuel prices, the market prices of wholesale energy compared to the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Energy sales from solar and wind PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or through a fixed price related to the energy. As a result, the ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Wholesale electric revenues at Mississippi Power include FERC-regulated MRA sales under cost-based tariffs as well as market-based sales. Short-term opportunity sales are made at market-based rates that generally provide a margin above the Southern Company system's variable cost to produce the energy.
Other Electric Revenues
Other electric revenues increased $45 million, or 6.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $23 million in outdoor lighting sales at Georgia Power, $18 million resulting from receipts of liquidated damages associated with generation facility production guarantees and $119an arbitration award at Southern Power, $17 million respectively, in 2017 and $11 millionrealized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs at Georgia Power, and $17 million respectively, in 2016.retail solar program fees at Georgia Power, partially offset by decreases of $25 million in cogeneration steam revenues associated with lower natural gas prices at Alabama Power and $14 million in rent revenues primarily at Alabama Power.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential47.1 (5.1)%(0.5)%
Commercial48.3 0.1 1.3 
Industrial48.6 (1.9)(1.9)
Other0.5 (7.2)(6.8)
Total retail144.5 (2.3)(0.4)%
Wholesale51.0 (9.4)
Total energy sales195.5 (4.3)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in the applicable service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Weather-adjusted retail energy sales decreased 587 million KWHs in 2023 as compared to 2022. Weather-adjusted residential KWH sales decreased 0.5% primarily due to decreased customer usage, partially offset by customer growth. Weather-adjusted commercial KWH sales increased 1.3% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 1.9% primarily due to decreases in the chemicals, forest products, and textiles sectors.
See "Electric Operating Revenues" above for a discussion of significant changes in wholesale revenues related to changes in price and KWH sales.
Other Revenues
Other revenues increased $108 million, or 37.5%, in 2023 as compared to 2022. The "All Other" column includesincrease was primarily due to increases of $54 million in power delivery construction and maintenance projects at Georgia Power, $34 million in unregulated sales of products and services at Alabama Power, and $25 million associated with energy conservation projects at Georgia Power.
Fuel and Purchased Power Expenses
The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, the electric utilities purchase a portion of their electricity needs from the wholesale market.
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Details of the Southern Company system's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)(b)
184 186 
Total purchased power (in billions of KWHs)
18 25 
Sources of generation (percent)(a) —
Gas54 51 
Nuclear(b)
18 16 
Coal17 22 
Hydro3 
Wind, Solar, and Other8 
Cost of fuel, generated (in cents per net KWH) 
Gas(a)
2.77 5.29 
Nuclear(b)
0.76 0.72 
Coal4.33 3.67 
Average cost of fuel, generated (in cents per net KWH)(a)(b)
2.68 4.05 
Average cost of purchased power (in cents per net KWH)(c)
5.17 7.66 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(c)Average cost of purchased power includes fuel purchased by the Southern Company system for tolling agreements where power is generated by the provider.
In 2023, total fuel and purchased power expenses were $5.2 billion, a decrease of $3.2 billion, or 37.7%, as compared to 2022. The decrease was primarily the result of a $2.7 billion decrease in the average cost of fuel generated and purchased and a $513 million net decrease in the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions at the traditional electric operating companies are generally offset by fuel revenues and do not have a significant impact on net income. See Note 2 to the financial statements for additional information. Fuel expenses incurred under Southern Power's PPAs are generally the responsibility of the counterparties and do not significantly impact net income.
Fuel
In 2023, fuel expense was $4.4 billion, a decrease of $2.5 billion, or 36.1%, as compared to 2022. The decrease was primarily due to a 47.6% decrease in the average cost of natural gas per KWH generated and a 22.5% decrease in the volume of KWHs generated by coal, partially offset by an 18.2% decrease in the volume of KWHs generated by hydro, an 18.0% increase in the average cost of coal per KWH generated, a 10.8% increase in the volume of KWHs generated by nuclear, and a 6.9% increase in the volume of KWHs generated by natural gas.
Purchased Power
In 2023, purchased power expense was $883 million, a decrease of $710 million, or 44.6%, as compared to 2022. The decrease was primarily due to a 32.5% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 27.5% decrease in the volume of KWHs purchased.
Energy purchases will vary depending on demand for energy within the Southern Company system's electric service territory, the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, and the availability of the Southern Company system's generation.
Cost of Other Sales
Cost of other sales increased $57 million, or 50.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $40 million from unregulated power delivery construction and maintenance projects at Georgia Power and $20 million in expenses related to unregulated products and services at Alabama Power.
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Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $550 million, or 10.5%, in 2023 as compared to 2022. The decrease reflects a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred at Alabama Power. Excluding this decrease, there were decreases of $223 million in transmission and distribution expenses primarily related to line maintenance, $182 million in storm damage recovery as authorized in Georgia Power's 2022 ARP, $91 million in generation non-outage maintenance expenses and planned outages, and $50 million in employee compensation and benefit expenses, partially offset by an $86 million increase in technology infrastructure and application production costs and a $73 million increase in generation environmental projects primarily at Georgia Power. See Note 1 to the financial statements under "Storm Damage and Reliability Reserves" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $836 million, or 27.6%, in 2023 as compared to 2022. The increase was primarily due to increases of $541 million and $190 million resulting from higher depreciation rates at Alabama Power and Georgia Power, respectively, and $79 million from additional plant in service. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $34 million, or 3.0%, in 2023 as compared to 2022. The increase was primarily due to increases of $62 million in property taxes primarily at Georgia Power resulting from an increase in the assessed value of property and $14 million in utility license taxes at Alabama Power, partially offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues at Georgia Power.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect Georgia Power's revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $37 million, or 17.6%, in 2023 as compared to 2022. The increase was primarily associated with an increase in capital expenditures subject to AFUDC at Georgia Power and an increase in capital expenditures related to hydro production and Plant Barry Unit 8 construction at Alabama Power. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $207 million, or 19.4%, in 2023 as compared to 2022. The increase reflects approximately $120 million related to higher interest rates and $96 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $17 million, or 3.3%, in 2023 as compared to 2022 primarily due to a $48 million decrease in charitable donations primarily at Georgia Power, a $15 million increase in interest income, and a $14 million decrease in non-operating benefit-related expenses at Alabama Power, partially offset by a $42 million decrease in non-service cost-related retirement benefits income and a $13 million decrease in customer charges related to contributions in aid of construction at Georgia Power. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $265 million, or 31.3%, in 2023 as compared to 2022. The decrease was primarily due to a $252 million increase in the flowback of certain excess deferred income taxes at Alabama Power, an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards at Georgia Power, generation of $35 million of advanced nuclear PTCs at Georgia Power, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward at Georgia Power, partially offset by a $145 million decrease in the flowback of certain excess deferred income taxes at Georgia Power that ended in 2022. See Note 10 to the financial statements for additional information.
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Net Loss Attributable to Noncontrolling Interests
Substantially all noncontrolling interests relate to renewable projects at Southern Power. Net loss attributable to noncontrolling interests increased $20 million, or 18.7%, in 2023 as compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to Southern Power's wind tax equity partners and $5 million in lower income allocations to Southern Power's equity partners, partially offset by $10 million in lower HLBV loss allocations to Southern Power's battery energy storage partners.
Gas Business
Southern Company Gas distributes natural gas through utilities in four states and is involved in several other complementary businesses including gas pipeline investments and gas marketing services.
A condensed statement of income for the gas business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Income taxes211 31 
Net income$615 $43 
During the period from November through March when natural gas usage and operating revenues are generally higher (Heating Season), more customers are connected to Southern Company Gas' distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively equally over any given year. Thus, operating results can vary significantly from quarter to quarter as a result of seasonality. For 2023, the percentage of operating revenues and net income generated during
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
the Heating Season (January through March and November through December) were 67% and 73%, respectively. For 2022, the percentage of operating revenues and net income generated during the Heating Season were 67% and 66%, respectively.
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Southern Company Gas hedged its exposure to warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. The remaining impacts of weather on earnings were immaterial.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, the natural gas distribution utilities rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at the natural gas distribution utilities represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, in 2023 compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses increased $18 million, or 1.5%, in 2023 compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Depreciation and Amortization
Depreciation and amortization increased $23 million, or 4.1%, in 2023 compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes decreased $20 million, or 7.1%, in 2023 compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $47 million, or 17.9%, in 2023 compared to 2022. The increase reflects approximately $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
Income taxes increased $31 million, or 17.2%, in 2023 compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Other Business Activities
Southern Company's other business activities primarily include the parent entity, whichcompany (which does not allocate operating expenses to business segments. Also, this category includes segments belowunits); PowerSecure, which provides distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers; Southern Holdings, which invests in various projects; and Southern Linc, which provides digital wireless communications for use by the quantitative threshold for separate disclosure. These segments include providing energy technologiesSouthern Company system and also markets these services to electric utilitiesthe public and large industrial, commercial, institutional, and municipal customers; as well as investments in telecommunications and leveraged lease projects. All other inter-segment revenues are not material. Financial data for business segments and products andprovides fiber optics services forwithin the years ended December 31, 2017, 2016, and 2015 was as follows:Southeast.
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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual ReportCOMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS

A condensed statement of operations for Southern Company's other business activities follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$554 $110 
Cost of other sales355 87 
Other operations and maintenance175 (26)
Depreciation and amortization77 
Taxes other than income taxes4 — 
Impairment charges (119)
Gain on dispositions, net 14 
Total operating expenses611 (42)
Operating income (loss)(57)152 
Earnings from equity method investments5 
Interest expense863 171 
Other income (expense), net(16)39 
Income taxes (benefit)(298)(65)
Net loss$(633)$87 
Operating Revenues
Operating revenues for these other business activities increased $110 million, or 24.8%, in 2023 as compared to 2022 primarily due to increases of $92 million related to distributed infrastructure projects at PowerSecure and $24 million primarily related to sales associated with commercial customers at Southern Linc.
Cost of Other Sales
Cost of other sales for these other business activities increased $87 million, or 32.5%, in 2023 as compared to 2022 primarily due to increases of $58 million related to distributed infrastructure projects at PowerSecure and $23 million primarily related to sales associated with commercial customers at Southern Linc.
Other Operations and Maintenance
Other operations and maintenance expenses for these other business activities decreased $26 million, or 12.9%, in 2023 as compared to 2022 primarily due to a decrease at the parent company related to cost containment efforts and lower director compensation expenses.
Impairment Charges
In 2022, a goodwill impairment charge of $119 million was recorded at PowerSecure. See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information.
Gain on Dispositions, Net
In 2022, a $14 million gain was recorded at the parent company as a result of the early termination of the transition services agreement related to the 2019 sale of Gulf Power.
Interest Expense
Interest expense for these other business activities increased $171 million, or 24.7%, in 2023 as compared to 2022. The increase primarily results from parent company financing activities and includes approximately $112 million related to higher interest rates and $73 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
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 Electric Utilities    
 
Traditional
Electric
Operating
Companies
Southern
Power
EliminationsTotalSouthern Company Gas
All
Other
EliminationsConsolidated
 (in millions)
2017        
Operating revenues$16,884
$2,075
$(419)$18,540
$3,920
$741
$(170)$23,031
Depreciation and amortization1,954
503

2,457
501
52

3,010
Interest income14
7

21
3
11
(9)26
Earnings from equity method investments1


1
106
(1)
106
Interest expense820
191

1,011
200
490
(7)1,694
Income taxes1,021
(939)
82
367
(307)
142
Segment net income (loss)(a)(b)(c)
(193)1,071

878
243
(279)
842
Total assets72,204
15,206
(325)87,085
22,987
2,552
(1,619)111,005
Gross property additions3,836
268

4,104
1,525
355

5,984
2016        
Operating revenues$16,803
$1,577
$(439)$17,941
$1,652
$463
$(160)$19,896
Depreciation and amortization1,881
352

2,233
238
31

2,502
Interest income6
7

13
2
20
(15)20
Earnings from equity method investments2


2
60
(3)
59
Interest expense814
117

931
81
317
(12)1,317
Income taxes1,286
(195)
1,091
76
(216)
951
Segment net income (loss)(a) (b)
2,233
338

2,571
114
(230)(7)2,448
Total assets72,141
15,169
(316)86,994
21,853
2,474
(1,624)109,697
Gross property additions4,852
2,114

6,966
618
41
(1)7,624
2015        
Operating revenues$16,491
$1,390
$(439)$17,442
$
$152
$(105)$17,489
Depreciation and amortization1,772
248

2,020

14

2,034
Interest income19
2
1
22

6
(5)23
Earnings from equity method investments1


1

(1)

Interest expense697
77

774

69
(3)840
Income taxes1,305
21

1,326

(132)
1,194
Segment net income (loss)(a) (b)
2,186
215

2,401

(32)(2)2,367
Total assets69,052
8,905
(397)77,560

1,819
(1,061)78,318
Gross property additions5,124
1,005

6,129

40

6,169
(a)Attributable to Southern Company.
(b)
Segment net income (loss) for the traditional electric operating companies includes pre-tax charges for estimated probable losses on the Kemper IGCC of $3.4 billion ($2.4 billion after tax) in 2017, $428 million ($264 million after tax) in 2016, and $365 million ($226 million after tax) in 2015. See Note 3 under "Kemper County Energy FacilitySchedule and Cost Estimate" for additional information.
(c)Segment net income (loss) for the traditional electric operating companies also includes a pre-tax charge for the write-down of Gulf Power's ownership of Plant Scherer Unit 3 of $33 million ($20 million after tax) in 2017. See Note 3 under "Regulatory Matters – Gulf Power – Retail Base Rate Cases" for additional information.

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NOTES (continued)
Southern Company and Subsidiary Companies 2017 Annual ReportCOMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS

Other Income (Expense), Net
ProductsOther income (expense), net for these other business activities increased $39 million, or 70.9%, in 2023 as compared to 2022 primarily due to a $29 million decrease in charitable donations and Servicesa $12 million increase in interest income, both primarily at the parent company. See Note 15 to the financial statements under "Southern Company" for additional information.
Income Taxes (Benefit)
The income tax benefit for these other business activities increased $65 million, or 27.9%, in 2023 as compared to 2022. The increase was primarily due to a $35 million tax benefit in 2023 related to a reversal of an uncertain tax position associated with the 2019 sale of Gulf Power and higher pre-tax losses, both at the parent company.
Alabama Power
Alabama Power's 2023 net income after dividends on preferred stock was $1.37 billion, representing a $30 million, or 2.2%, increase from 2022. The increase was primarily due to a decrease in income tax expense, an increase in Rate CNP Compliance revenues, a decrease in operations and maintenance expenses primarily related to the reliability reserve, and a lower Rate RSE customer refund accrual in 2023 compared to 2022. These increases to net income were offset by an increase in depreciation rates effective January 2023, a decrease in retail revenues associated with milder weather in Alabama Power's service territory in the first and second quarters of 2023 compared to the corresponding periods in 2022, and increases in capacity-related expenses and interest expense. See Note 2 to the financial statements under "Alabama Power" for additional information.
A condensed income statement for Alabama Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$7,050 $(767)
Fuel1,299 (541)
Purchased power504 (297)
Other operations and maintenance1,769 (166)
Depreciation and amortization1,401 526 
Taxes other than income taxes442 18 
Total operating expenses5,415 (460)
Operating income1,635 (307)
Allowance for equity funds used during construction82 12 
Interest expense, net of amounts capitalized425 43 
Other income (expense), net159 15 
Income taxes81 (342)
Net income1,370 19 
Dividends on preferred stock (11)
Net income after dividends on preferred stock$1,370 $30 
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Electric Utilities' Revenues
YearRetail Wholesale Other Total
 (in millions)
2017$15,330
 $2,426
 $784
 $18,540
201615,234
 1,926
 781
 17,941
201514,987
 1,798
 657
 17,442

Southern Company Gas' Revenues
YearGas
Distribution
Operations
 Gas
Marketing
Services
 All Other Total
 (in millions)
2017$3,024
 $860
 $36
 $3,920
20161,266
 354
 32
 1,652


NOTES (continued)COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Operating Revenues
Operating revenues for 2023 were $7.1 billion, reflecting a $767 million, or 9.8%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$6,470 
Estimated change resulting from —
Rates and pricing276 
Sales decline(33)
Weather(84)
Fuel and other cost recovery(470)
Retail — current year$6,159 $6,470 
Wholesale revenues —
Non-affiliates424 726 
Affiliates60 202 
Total wholesale revenues484 928 
Other operating revenues407 419 
Total operating revenues$7,050 $7,817 
Retail revenues decreased $311 million, or 4.8%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The decrease was primarily due to a decrease in fuel and other cost recovery, partially offset by an increase in revenues associated with rates and pricing primarily due to an increase in Rate CNP Compliance revenues and a lower Rate RSE customer refund accrual in 2023 compared to 2022.
See Note 2 to the financial statements under "Alabama Power – Rate ECR," " – Rate RSE," and " – Rate CNP Compliance" for additional information. See "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates include provisions to recognize the recovery of fuel costs, purchased power costs, PPAs certificated by the Alabama PSC, and costs associated with the NDR. Under these provisions, fuel and other cost recovery revenues generally equal fuel and other cost recovery expenses and do not affect net income. See Note 2 to the financial statements under "Alabama Power" for additional information.
Wholesale revenues from sales to non-affiliated utilities were as follows:
20232022
(in millions)
Capacity and other$163 $213 
Energy261 513 
Total non-affiliated$424 $726 
In 2023, wholesale revenues from sales to non-affiliates decreased $302 million, or 41.6%, as compared to 2022. The decrease reflects a 26.0% decrease in the volume of KWHs sold as a result of power sales agreements that ended in May 2023 and a 20.8% decrease in the price of energy primarily as a result of lower natural gas prices.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Alabama Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affect net income. Short-term opportunity energy sales are also included in wholesale energy sales to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Alabama Power's variable cost to produce the energy.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
In 2023, wholesale revenues from sales to affiliates decreased $142 million, or 70.3%, as compared to 2022. The revenue decrease reflects a 47.7% decrease in the price of energy due to lower natural gas prices and a 42.9% decrease in KWH sales due to lower customer demand as a result of milder weather in 2023.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales and purchases are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through Alabama Power's energy cost recovery clause.
In 2023, other operating revenues decreased $12 million, or 2.9%, as compared to 2022 primarily due to decreases of $25 million in cogeneration steam revenue associated with lower natural gas prices and $17 million in rent revenues, partially offset by a $34 million increase in unregulated sales of products and services.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change(*)
(in billions)
Residential17.4 (5.7)%(0.9)%
Commercial12.9 (1.2)0.4 
Industrial20.4 (2.8)(2.8)
Other0.1 (15.5)(15.5)
Total retail50.8 (3.4)(1.3)%
Wholesale
Non-affiliates9.3 (26.0)
Affiliates2.1 (42.9)
Total wholesale11.4 (29.9)
Total energy sales62.2 (9.7)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from the normal temperature conditions. Normal temperature conditions are defined as those experienced in Alabama Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. In 2023, weather-adjusted residential KWH sales decreased 0.9% primarily due to decreased customer usage. Weather-adjusted commercial KWH sales increased 0.4% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 2.8% as a result of a decrease in demand resulting from changes in production levels primarily in the chemicals and forest products sectors.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies related to changes in price and KWH sales.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, Alabama Power purchases a portion of its electricity needs from the wholesale market.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Details of Alabama Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
54.558.3 
Total purchased power (in billions of KWHs)
10.811.6 
Sources of generation (percent)(a)
Coal35 46 
Gas31 24 
Nuclear27 22 
Hydro7 
Cost of fuel, generated (in cents per net KWH)
Coal3.46 3.39 
Gas(a)
2.99 5.12 
Nuclear0.69 0.67 
Average cost of fuel, generated (in cents per net KWH)(a)
2.50 3.19 
Average cost of purchased power (in cents per net KWH)(b)
4.98 8.00 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by Alabama Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $1.8 billion in 2023, a decrease of $838 million, or 31.7%, compared to 2022. The decrease was primarily due to a $674 million decrease in the average cost of fuel and purchased power and a $164 milliondecrease related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through Alabama Power's energy cost recovery clause. Alabama Power, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 2 to the financial statements under "Alabama Power – Rate ECR" for additional information.
Fuel
Fuel expense was $1.3 billion in 2023, a decrease of $541 million, or 29.4%, compared to 2022. The decrease was primarily due to a 41.6% decrease in the average cost of natural gas per KWH generated, which excludes tolling agreements, and a 29.1% decrease in the volume of KWHs generated by coal, partially offset by a 21.2% increase in the volume of KWHs generated by natural gas, an 18.9% decrease in the volume of KWHs generated by hydro facilities as a result of less rainfall in 2023, and a 13.6% increase in the volume of KWHs generated by nuclear.
Purchased Power Non-Affiliates
Purchased power expense from non-affiliates was $253 million in 2023, a decrease of $188 million, or 42.6%, compared to 2022. The decrease was primarily due to a 32.9% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 25.5% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power Affiliates
Purchased power expense from affiliates was $251 million in 2023, a decrease of $109 million, or 30.3%, compared to 2022. The decrease was primarily due to a 51.4% decrease in the average cost per KWH purchased primarily due to lower natural gas prices, partially offset by a 43.4% increase in the volume of KWHs purchased due to the availability of lower cost gas generation in the Southern Company system.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $166 million, or 8.6%, in 2023 as compared to 2022. The change was primarily due to a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred, as well as decreases of $33 million in transmission and distribution expenses and $21 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $30 million in technology infrastructure and application production costs and $25 million in expenses related to unregulated products and services, as well as a $14 million decrease in nuclear property insurance refunds. See Note 2 to the financial statements under "Alabama Power – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $526 million, or 60.1%, in 2023 as compared to 2022 primarily due to an increase in depreciation rates effective in 2023. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $12 million, or 17.1%, in 2023 as compared to 2022 primarily due to increases in capital expenditures related to hydro production and Plant Barry Unit 8 construction. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $43 million, or 11.3%, in 2023 as compared to 2022. The increase reflects approximately $30 million related to higher average outstanding borrowings and $20 million related to higher interest rates. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $15 million, or 10.4%, in 2023 as compared to 2022 primarily due to a decrease in non-operating benefit-related expenses and an increase in interest income, partially offset by a decrease in non-service cost-related retirement benefits income. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $342 million, or 80.9%, in 2023 as compared to 2022 primarily due to a $252 million increase in the flowback of certain excess deferred income taxes and an $84 million decrease due to lower pre-tax earnings. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" and Note 10to the financial statements for additional information.
Georgia Power
Georgia Power's 2023 net income was $2.1 billion, representing a $0.3 billion, or 14.7%, increase from the previous year. The increase was primarily due to lower non-fuel operations and maintenance costs, revenue reductions in 2022 as a result of Georgia Power exceeding its allowed retail return range, a $187 million decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, and an increase in other revenues, partially offset by a decrease in retail revenues associated with lower contributions from customers with variable demand-driven pricing and milder weather in 2023, as well as higher interest expense. Also contributing to the net income growth were the impacts of the 2022 ARP effective January 1, 2023, including increased retail rates, largely offset by higher depreciation and amortization. See Note 2 to the financial statements under "Georgia Power" for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
A condensed income statement for Georgia Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$10,118 $(1,466)
Fuel1,781 (705)
Purchased power1,281 (976)
Other operations and maintenance2,083 (266)
Depreciation and amortization1,681 251 
Taxes other than income taxes541 14 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total operating expenses7,299 (1,933)
Operating income2,819 467 
Allowance for equity funds used during construction165 25 
Interest expense, net of amounts capitalized626 141 
Other income (expense), net170 (6)
Income taxes (benefit)448 78 
Net income$2,080 $267 
Operating Revenues
Operating revenues for 2023 were $10.1 billion, reflecting a $1.5 billion, or 12.7%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$10,792 
Estimated change resulting from —
Rates and pricing172 
Sales decline(10)
Weather(141)
Fuel cost recovery(1,591)
Retail — current year$9,222 $10,792 
Wholesale revenues188 235 
Other operating revenues708 557 
Total operating revenues$10,118 $11,584 
Retail revenues decreased $1.6 billion, or 14.5%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing was primarily due to base tariff increases in accordance with the 2022 ARP and revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed retail ROE range, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in revenues recognized under the NCCR tariff. See Note 2 to the financial statements under "Georgia Power – Rate Plans" and " – Nuclear Construction" for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather in 2023.
Electric rates include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses and do not affect net income. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Wholesale revenues from power sales were as follows:
20232022
(in millions)
Capacity and other$66 $48 
Energy122 187 
Total$188 $235 
In 2023, wholesale revenues decreased $47 million, or 20.0%, as compared to 2022 largely due to an $81 million decrease related to the average cost per KWH sold due to lower Southern Company system fuel and purchased power costs, partially offset by a $21 million increase related to new capacity contracts and a $13 million increase related to the volume of KWH sales associated with higher market demand.
Wholesale revenues from sales to non-affiliates consist of PPAs and short-term opportunity sales. Wholesale revenues from PPAs have both capacity and energy components. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms and provide for recovery of fixed costs and a return on investment. Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Georgia Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above Georgia Power's variable cost of energy.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues increased $151 million, or 27.1%, as compared to 2022 primarily due to an increase of $105 million in unregulated sales associated with power delivery construction and maintenance, outdoor lighting, and energy conservation projects, a net increase of $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs, an increase of $17 million in retail solar program fees, and a $9 million increase in open access transmission tariff sales.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential27.6 (5.0)%(0.4)%
Commercial32.6 0.1 1.2 
Industrial23.5 (1.6)(1.4)
Other0.4 (4.7)(4.2)
Total retail84.1 (2.1)(0.1)%
Wholesale2.6 7.8 
Total energy sales86.7 (1.9)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Georgia Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. Weather-adjusted residential sales decreased 0.4% primarily due to decreased customer usage, largely offset by customer growth. Weather-adjusted commercial KWH sales increased 1.2% primarily due to customer growth. Weather-adjusted industrial KWH sales decreased
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1.4% primarily due to decreases in the textile, mining, and stone, clay, and glass sectors, partially offset by an increase in the paper sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for Georgia Power. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Georgia Power purchases a portion of its electricity needs from the wholesale market.
Details of Georgia Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
60.359.7 
Total purchased power (in billions of KWHs)
29.633.6 
Sources of generation (percent) —
Gas49 48 
Nuclear(a)
29 27 
Coal19 21 
Hydro and other3 
Cost of fuel, generated (in cents per net KWH)
Gas3.07 5.06 
Nuclear(a)
0.82 0.75 
Coal5.59 4.12 
Average cost of fuel, generated (in cents per net KWH)(a)
2.90 3.64 
Average cost of purchased power (in cents per net KWH)(b)
4.63 7.88 
(a)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(b)Average cost of purchased power includes fuel purchased by Georgia Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $3.1 billion in 2023, a decrease of $1.7 billion, or 35.4%, compared to 2022. The decrease was due to decreases of $1.4 billion related to the average cost of fuel and purchased power and $321 million related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through Georgia Power's fuel cost recovery mechanism. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Fuel
Fuel expense was $1.8 billion in 2023, a decrease of $0.7 billion, or 28.4%, compared to 2022. The decrease was primarily due to decreases of 39.3% in the average cost per KWH generated by natural gas and 8.9% in the volume of KWHs generated by coal, partially offset by increases of 35.7% in the average cost per KWH generated by coal, 9.3% in the average cost per KWH generated by nuclear, 8.5% in the volume of KWHs generated by nuclear, and 2.1% in the volume of KWHs generated by natural gas.
Purchased Power – Non-Affiliates
Purchased power expense from non-affiliates was $517 million in 2023, a decrease of $339 million, or 39.6%, compared to 2022. The decrease was primarily due to a decrease of 33.9% in the volume of KWHs purchased due to lower demand and the availability of lower cost generation in the Southern Company system and a decrease of 22.3% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
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Purchased Power – Affiliates
Purchased power expense from affiliates was $764 million in 2023, a decrease of $637 million, or 45.5%, compared to 2022. The decrease was primarily due to a decrease of 49.1% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $266 million, or 11.3%, in 2023 as compared to 2022. The decrease was primarily due to decreases of $182 million in storm damage recovery as authorized in the 2022 ARP, $178 million in transmission and distribution expenses primarily associated with line maintenance, $74 million in generation non-outage maintenance expenses, and $28 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $60 million from unregulated power delivery construction and maintenance and energy conservation projects, $59 million in generation environmental projects, $55 million in technology infrastructure and application production costs, and $28 million in planned generation outages. See Note 2 to the financial statements under "Georgia Power – Storm Damage Recovery" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $251 million, or 17.6%, in 2023 as compared to 2022 primarily due to increases of $190 million resulting from higher depreciation rates as authorized in the 2022 ARP and $75 million associated with additional plant in service, partially offset by a decrease of $15 million in amortization of regulatory assets related to the retirement of certain generating units that ended in 2022.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $14 million, or 2.7%, in 2023 as compared to 2022 primarily due to an increase of $56 million in property taxes primarily resulting from an increase in the assessed value of property, largely offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $25 million, or 17.9%, in 2023 as compared to 2022 primarily due to an increase in capital expenditures subject to AFUDC.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $141 million, or 29.1%, in 2023 as compared to 2022. The increase primarily reflects approximately $78 million related to higher interest rates and $76 million related to higher average outstanding borrowings, partially offset by the deferral of $14 million in financing costs related to Plant Vogtle Unit 3. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information. Also see Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
Other Income (Expense), Net
Other income (expense), net decreased $6 million, or 3.4%, in 2023 as compared to 2022 primarily due to decreases in non-service cost-related retirement benefits income and customer charges related to contributions in aid of construction, partially offset by a decrease in charitable donations. See Note 11 to the financial statements for additional information on Georgia Power's net periodic pension and other postretirement benefit costs.
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Income Taxes (Benefit)
Income taxes increased $78 million, or 21.1%, in 2023 as compared to 2022 primarily due to the flowback of $145 million of certain excess deferred income taxes that ended in 2022 and higher pre-tax earnings largely resulting from lower charges associated with the construction of Plant Vogtle Units 3 and 4, partially offset by an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards, generation of $35 million of advanced nuclear PTCs, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" and Note 10to the financial statements for additional information.
Mississippi Power
Mississippi Power's net income was $188 million in 2023 compared to $164 million in 2022. The increase was primarily due to an increase in affiliate wholesale capacity revenues, changes in power supply agreements, and a decrease in non-fuel operations and maintenance expenses, partially offset by an increase in interest expense.
A condensed income statement for Mississippi Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$1,474 $(220)
Fuel and purchased power538 (251)
Other operations and maintenance362 (14)
Depreciation and amortization190 9 
Taxes other than income taxes124  
Total operating expenses1,214 (256)
Operating income260 36 
Interest expense, net of amounts capitalized71 15 
Other income (expense), net35 2 
Income taxes36 (1)
Net income$188 $24 
Operating Revenues
Operating revenues for 2023 were $1.5 billion, reflecting a $220 million, or 13.0%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$935 
Estimated change resulting from —
Rates and pricing(11)
Sales growth11 
Weather(4)
Fuel and other cost recovery32 
Retail — current year$963 $935 
Wholesale revenues —
Non-affiliates272 252 
Affiliates200 460 
Total wholesale revenues472 712 
Other operating revenues39 47 
Total operating revenues$1,474 $1,694 
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Total retail revenues for 2023 increased $28 million, or 3.0%, compared to 2022 primarily due to higher recoverable fuel costs and an increase in customer usage, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and lower revenues associated with a tolling arrangement accounted for as a sales-type lease. See Notes 2 and 9 to the financial statements under "Mississippi Power" and "Lessor," respectively, for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates for Mississippi Power include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not affect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside Mississippi Power's service territory. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" for additional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
20232022
(in millions)
Capacity and other$21 $
Energy251 249 
Total non-affiliated$272 $252 
Wholesale revenues from sales to non-affiliates increased $20 million, or 7.9%, compared to 2022. The increase was primarily due to capacity revenues associated with new capacity contracts in 2023.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Mississippi Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. In addition, Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023. Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Mississippi Power's variable cost to produce the energy. See Note 2 under "Mississippi Power – Municipal and Rural Associations Tariff" for additional information.
Wholesale revenues from sales to affiliates decreased $260 million, or 56.5%, in 2023 compared to 2022. The decrease was primarily due to a $293 million decrease associated with lower natural gas prices, partially offset by a $23 million increase in capacity revenues resulting from availability of generation reserves and an increase in pricing and a $10 million increase associated with higher KWH sales.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. The energy portion of these transactions does not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues decreased $8 million, or 17.0%, as compared to 2022 primarily due to decreases of $5 million in unregulated sales associated with power delivery construction and maintenance projects and $3 million in open access transmission tariff revenues.
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Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted Percent Change(*)
(in millions)
Residential2,092 (1.9)%0.7 %
Commercial2,815 7.0 7.1 
Industrial4,721 0.7 0.7 
Other28 (11.1)(11.1)
Total retail9,656 1.8 %2.5 %
Wholesale
Non-affiliated3,836 10.7 
Affiliated5,612 2.2 
Total wholesale9,448 5.5 
Total energy sales19,104 3.6 %
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Mississippi Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales increased in 2023 when compared to 2022. Weather-adjusted residential KWH sales increased 0.7% due to an increase in customer usage. Weather-adjusted commercial KWH sales increased 7.1% primarily due to customer growth. Industrial KWH sales increased 0.7% primarily due to an increase in the non-manufacturing sector, partially offset by a decrease in the chemicals sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Mississippi Power purchases a portion of its electricity needs from the wholesale market.
Details of Mississippi Power's generation and purchased power were as follows:
20232022
Total generation (in millions of KWHs)
18,789 18,303 
Total purchased power (in millions of KWHs)
524 617 
Sources of generation (percent) –
Gas92 90 
Coal8 10 
Cost of fuel, generated (in cents per net KWH) –
Gas2.68 4.34 
Coal5.46 4.13 
Average cost of fuel, generated (in cents per net KWH)
2.90 4.31 
Average cost of purchased power (in cents per net KWH)
4.27 6.91 
Fuel and purchased power expenses were $538 million in 2023, a decrease of $251 million, or 31.8%, as compared to 2022. The decrease was primarily due to a $266 million decrease related to the average cost of fuel and purchased power, partially offset by a $15 million net increase related to the volume of KWHs generated and purchased.
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Fuel and purchased power energy transactions do not have a significant impact on earnings since energy expenses are generally offset by energy revenues through Mississippi Power's fuel cost recovery clauses. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" and Note 1 to the financial statements under "Fuel Costs" for additional information.
Fuel expense decreased $230 million, or 30.8%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost of natural gas per KWH generated and a 20.3% decrease in the volume of KWHs generated by coal, partially offset by a 32.2% increase in the average cost of coal per KWHs generated and a 5.4% increase in the volume of KWHs generated by natural gas.
Purchased power expense decreased $21 million, or 49.9%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 15.1% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $14 million, or 3.7%, in 2023 compared to 2022. The decrease was primarily due to decreases of $14 million in reliability reserve accruals, $7 million in generation expenses, and $6 million in unregulated power delivery construction and maintenance projects, partially offset by increases of $5 million in storm reserve accruals and $2 million in certain employee compensation and benefit expenses. See Note 2 to the financial statements under "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $9 million, or 5.0%, in 2023 compared to 2022 primarily due to an increase in depreciation associated with additional plant in service.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $15 million, or 26.8%, in 2023 compared to 2022. The increase was primarily due to increases of approximately $10 million related to higher interest rates and $5 million related to higher average outstanding borrowings. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information.
Income Taxes
Income taxes decreased $1 million, or 2.7%, in 2023 compared to 2022 primarily due to a decrease of $7 million associated with the flowback of certain excess deferred income taxes associated with new PEP rates that became effective in April 2023, largely offset by an increase of $6 million associated with higher pre-tax earnings. See Note 2 to the financial statements under "Mississippi Power – Performance Evaluation Plan" and Note 10 to the financial statements for additional information.
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Southern Power
Net income attributable to Southern Power for 2023 was $357 million, a $3 million increase from 2022. The increase was primarily due to higher HLBV income associated with tax equity partnerships, an arbitration award received for losses previously incurred, a gain on the sale of spare parts, and receipts of liquidated damages and insurance proceeds related to generation facility production and equipment, as well as changes in state apportionment methodology related to tax legislation enacted by the State of Tennessee. These increases were largely offset by lower revenues driven by lower market prices of energy.
A condensed statement of income follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$2,189 $(1,180)
Fuel706 (908)
Purchased power116 (195)
Other operations and maintenance473 (9)
Depreciation and amortization504 (12)
Taxes other than income taxes51 2 
Loss on sales-type leases (1)
Gain on dispositions, net(20)(18)
Total operating expenses1,830 (1,141)
Operating income359 (39)
Interest expense, net of amounts capitalized129 (9)
Other income (expense), net12 5 
Income taxes (benefit)12 (8)
Net income230 (17)
Net loss attributable to noncontrolling interests(127)(20)
Net income attributable to Southern Power$357 $3 
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company power pool.
Natural Gas Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to operating income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of Southern Power's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have capacity revenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy generated from the respective facility and sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.
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See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.
Operating Revenues Details
Details of Southern Power's operating revenues were as follows:
20232022
(in millions)
PPA capacity revenues$471 $451 
PPA energy revenues1,227 2,121 
Total PPA revenues1,698 2,572 
Non-PPA revenues436 761 
Other revenues55 36 
Total operating revenues$2,189 $3,369 
Operating revenues for 2023 were $2.2 billion, a $1.2 billion, or 35.0% decrease from 2022. The change in operating revenues was primarily due to the following:
PPA capacity revenuesincreased $20 million, or 4.4%, primarily due to an increase associated with a change in rates from new and existing natural gas PPAs.
PPA energy revenues decreased $894 million, or 42.1%, primarily due to a $904 million decrease in sales under natural gas PPAs resulting from a $726 million decrease in the price of fuel and purchased power and a $178 million decrease in the volume of KWHs sold.
Non-PPA revenues decreased $325 million, or 42.7%, primarily due to a $650 million decrease in the market price of energy, partially offset by a $321 million increase in the volume of KWHs sold through short-term sales.
Other revenues increased $19 million, or 52.8%, primarily due to receipts of liquidated damages associated with generation facility production guarantees, an arbitration award received for losses previously incurred, and business interruption insurance proceeds for damaged generation equipment. See Note 3 to the financial statements under "General Litigation Matters – Southern Power" for additional information.
Fuel and Purchased Power Expenses
Details of Southern Power's generation and purchased power were as follows:
Total
KWHs
Total KWH % ChangeTotal
KWHs
20232022
(in billions of KWHs)
Generation4948
Purchased power33
Total generation and purchased power522.0%51
Total generation and purchased power (excluding solar, wind, fuel cells, and tolling agreements)
336.5%31
Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
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Details of Southern Power's fuel and purchased power expenses were as follows:
20232022
(in millions)
Fuel$706 $1,614 
Purchased power116 311 
Total fuel and purchased power expenses$822 $1,925 
In 2023, total fuel and purchased power expenses decreased $1.1 billion, or 57.3%, compared to 2022. Fuel expensedecreased $908 million, or 56.3%, primarily due to a $1.0 billion decrease associated with the average cost of fuel. Purchased power expense decreased $195 million, or 62.7%, primarily due to a $206 million decrease associated with the average cost of purchased power.
Gain on Dispositions, Net
In 2023, gain on dispositions, net increased $18 million compared to 2022 primarily due to a $16 million gain on the sale of spare parts in 2023.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized decreased $9 million, or 6.5%, compared to 2022. The decrease was primarily due to lower average outstanding borrowings.
Income Taxes (Benefit)
In 2023, income taxes decreased $8 million, or 40.0%, compared to 2022. The decrease was primarily due to a change in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in the second quarter 2023. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate," respectively, for additional information.
Net Loss Attributable to Noncontrolling Interests
In 2023, net loss attributable to noncontrolling interests increased $20 million, or 18.7%, compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to wind tax equity partners and $5 million in lower income allocations to equity partners, partially offset by $10 million in lower HLBV loss allocations to battery energy storage partners.
Southern Company Gas
Southern Company Gas has various regulatory mechanisms, such as weather and Subsidiary Companies 2017 Annual Reportrevenue normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of its utility's respective service territory. Southern Company Gas also utilizes weather hedges to limit the negative income impacts in the event of warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. Therefore, weather typically does not have a significant net income impact.
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas and bad debt expense, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing Southern Company Gas' annual results. Thus, Southern Company Gas' operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
Percent Generated During
Heating Season
Operating RevenuesNet
Income
202367 %73 %
202267 %66 %
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Net Income
14. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)Net income attributable to Southern Company Gas in 2023 was $615 million, an increase of $43 million, or 7.5%, compared to 2022. Net income increased primarily as a result of an impairment charge in 2022 related to the sale of natural gas storage facilities. The increase in net income was partially offset by a decrease of $29 million in net income at gas distribution operations primarily as a result of reduced revenue due to lower volumes sold, regulatory disallowances at Nicor Gas, and higher depreciation related to continued investment in infrastructure replacement programs, partially offset by lower cost of gas, and a $9 million decrease in net income at gas pipeline investments primarily as a result of higher expenses at SNG.
Summarized quarterly financial informationA condensed income statement for 2017 and 2016 isSouthern Company Gas follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Earnings before income taxes826 74 
Income taxes211 31 
Net Income$615 $43 
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from
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     Consolidated Net Income Attributable to Southern Company Per Common Share
 
Operating
Revenues
 
Operating
Income
  
Basic
Earnings
 Diluted Earnings   
Trading
Price Range
Quarter Ended Dividends High Low
 (in millions)          
March 2017$5,771
 $1,306
 $658
 $0.66
 $0.66
 $0.5600
 $51.47
 $47.57
June 20175,430
 (1,594) (1,381) (1.38) (1.37) 0.5800
 51.97
 47.87
September 20176,201
 2,045
 1,069
 1.07
 1.06
 0.5800
 50.80
 46.71
December 20175,629
 794
 496
 0.49
 0.49
 0.5800
 53.51
 47.92
                
March 2016$3,992
 $940
 $489
 $0.53
 $0.53
 $0.5425
 $51.73
 $46.00
June 20164,459
 1,185
 623
 0.67
 0.66
 0.5600
 53.64
 47.62
September 20166,264
 1,917
 1,139
 1.18
 1.17
 0.5600
 54.64
 50.00
December 20165,181
 587
 197
 0.20
 0.20
 0.5600
 52.23
 46.20
customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information.
AsRevenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Customer Count
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas distribution operations' and gas marketing services' customers are primarily located in Georgia and Illinois.
The following table provides the number of customers served by Southern Company Gas at December 31, 2023 and 2022:
20232022
(in thousands, except market share %)
Gas distribution operations4,374 4,358 
Gas marketing services
Energy customers665 622 
Market share of energy customers in Georgia30.0 %29.3 %
Southern Company Gas anticipates customer growth and uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at gas distribution operations represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
In 2023, cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
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Volumes of Natural Gas Sold
Southern Company Gas' natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas.
The following table details the volumes of natural gas sold during all periods presented:
2023 vs. 2022
20232022% Change
Gas distribution operations (mmBtu in millions)
Firm625 707 (11.6)%
Interruptible93 93  
Total718 800 (10.3)%
Gas marketing services (mmBtu in millions)
Firm:
Georgia33 35 (5.7)%
Other19 18 5.6 
Interruptible large commercial and industrial14 14  
Total66 67 (1.5)%
Other Operations and Maintenance Expenses
In 2023, other operations and maintenance expenses increased $18 million, or 1.5%, compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Depreciation and Amortization
In 2023, depreciation and amortization increased $23 million, or 4.1%, compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
In 2023, taxes other than income taxes decreased $20 million, or 7.1%, compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized increased $47 million, or 17.9%, compared to 2022. The increase reflects $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
In 2023, income taxes increased $31 million, or 17.2%, compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes
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related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Segment Information
20232022
Operating RevenuesOperating ExpensesNet Income (Loss)Operating RevenuesOperating ExpensesNet Income (Loss)
(in millions)(in millions)
Gas distribution operations$4,105 $3,301 $441 $5,267 $4,464 $470 
Gas pipeline investments32 10 98 32 11 107 
Gas marketing services548 418 91 638 505 94 
All other36 40 (15)55 190 (99)
Intercompany eliminations(19)(6) (30)(22)— 
Consolidated$4,702 $3,763 $615 $5,962 $5,148 $572 
Gas Distribution Operations
Gas distribution operations is the largest component of Southern Company Gas' business and is subject to regulation and oversight by regulatory agencies in each of the states it serves. These agencies approve natural gas rates designed to provide Southern Company Gas with the opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest expense, operations and maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, Southern Company Gas' second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. Southern Company Gas has various regulatory and other mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit its exposure to changes in customer consumption, including weather changes within typical ranges in its natural gas distribution utilities' service territories. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income decreased $29 million, or 6.2%, compared to 2022. Operating revenues decreased $1.2 billion primarily due to lower gas cost recovery and lower volumes sold, partially offset by rate increases and continued investment in infrastructure replacement. Gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas. Operating expenses decreased $1.2 billion primarily due to a $1.3 billion decrease in the cost of natural gas as a result of lower gas prices compared to 2022 and lower taxes other than income taxes, partially offset by $88 million related to the regulatory disallowances at Nicor Gas, higher depreciation resulting from additional assets placed in service, higher compensation and benefits expenses, and a $20 million increase related to energy service contracts. The decrease in operating expenses also includes costs passed through directly to customers, primarily related to bad debt expenses, energy efficiency programs, and revenue taxes. The decrease in net income also includes an increase of $46 million in interest expense, net of amounts capitalized primarily due to higher interest rates and higher average outstanding debt, partially offset by a $19 million decrease in income taxes primarily as a result of the revisionstax benefit resulting from the regulatory disallowances at Nicor Gas. See Note 2 to the cost estimatefinancial statements under "Southern Company Gas" for additional information.
Gas Pipeline Investments
Gas pipeline investments consists primarily of joint ventures in natural gas pipeline investments including SNG and Dalton Pipeline. In 2023, net income decreased $9 million compared to 2022. The decrease was primarily due to lower earnings at SNG resulting from higher expenses. See Note 7 to the Kemper IGCCfinancial statements under "Southern Company Gas" for additional information.
Gas Marketing Services
Gas marketing services provides energy-related products and its June 2017 suspension, Mississippi Power recorded total pre-tax chargesservices to natural gas markets and participants in customer choice programs that were approved in various states to increase competition. These programs allow customers to choose their natural gas supplier while the local distribution utility continues to provide distribution and transportation services. Gas marketing
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services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts.
In 2023, net income decreased $3 million, or 3.2%, compared to 2022. The decrease was due to a $90 million decrease in operating revenues primarily due to lower gas prices and the timing of unrealized hedge losses, largely offset by an $87 million decrease in operating expenses primarily related to a $106 million decrease in cost of gas, partially offset by higher compensation and benefits.
All Other
All other includes natural gas storage businesses, a renewable natural gas business, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the Kemper IGCC of $208reportable segments and interest income (expense) associated with affiliate financing arrangements. All other included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income increased $84 million compared to 2022. The increase was primarily due to a decrease in operating expenses primarily related to pre-tax impairment charges in 2022 totaling approximately $131 million ($18599 million after tax) in the fourth quarter 2017, $34 million ($21 million after tax) in the third quarter 2017, $3.0 billion ($2.1 billion after tax) in the second quarter 2017, $108 million ($67 million after tax) in the first quarter 2017, $206 million ($127 million after tax) in the fourth quarter 2016, $88 million ($54 million after tax) in the third quarter 2016, $81 million ($50 million after tax) in the second quarter 2016, and $53 million ($33 million after tax) in the first quarter 2016. See Note 3 under "Kemper County Energy Facility" for additional information.
Asas a result of an agreement to sell two natural gas storage facilities, lower depreciation, lower cost of gas, and lower taxes other than income taxes, partially offset by a decrease in operating revenues of $19 million and an increase in income taxes. See Note 10 to the Tax Reform Legislation,financial statements and Note 15 to the financial statements under "Southern Company Gas"for additional information.
FUTURE EARNINGS POTENTIAL
General
Prices for electric service provided by the traditional electric operating companies and natural gas distribution service provided by the natural gas distribution utilities to retail customers are set by state PSCs or other applicable state regulatory agencies under cost-based regulatory principles. Retail rates and earnings are reviewed through various regulatory mechanisms and/or processes and may be adjusted periodically within certain limitations. Effectively operating pursuant to these regulatory mechanisms and/or processes and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the traditional electric operating companies and natural gas distribution utilities for the foreseeable future. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Southern Power continues to focus on long-term PPAs. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 2 to the financial statements for additional information about regulatory matters.
Each Registrant's results of operations are not necessarily indicative of its future earnings potential. The level of the Registrants' future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Registrants' primary businesses of selling electricity and/or distributing natural gas, as described further herein.
For the traditional electric operating companies, these factors include the ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs during a time of increasing costs, including those related to projected long-term demand growth, stringent environmental standards, including CCR rules, safety, system reliability and resiliency, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants and expanding and improving the transmission and distribution systems; continued customer growth; and the trends of higher inflation and reduced electricity usage per customer, especially in residential and commercial markets. For Georgia Power, other major factors are completing construction and start-up of Plant Vogtle Unit 4 and meeting the related cost and schedule projections.
Earnings in the electricity business will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, which could contribute to a net reduction in customer usage.
Global and U.S. economic conditions continue to be affected by higher-than-expected inflation that arose from the COVID-19 pandemic and associated policy responses of governments and central banks. In response to elevated inflation levels, the U.S. Federal Reserve raised interest rates faster than any rate increase cycle in the last 40 years. The actions by the U.S. Federal Reserve have helped to slow the rate of inflation and curtail economic activity. Although target levels of inflation have yet to be achieved, the U.S. Federal Reserve has indicated its current intention to pause future rate increases and evaluate rate cuts in the near term. The shifting economic policy variables and weakening of historic relationships among economic activity, prices, and employment have increased the uncertainty of future levels of economic activity, which will directly impact future energy demand and operating costs. Weakening economic activity increases the risk of slowing or declining energy sales. See RESULTS OF OPERATIONS herein for information on energy sales in the Southern Company system recorded asystem's service territory during 2023.
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The level of future earnings for Southern Power's competitive wholesale electric business depends on numerous factors including the parameters of the wholesale market and the efficient operation of its wholesale generating assets; Southern Power's ability to execute its growth strategy through the development, construction, or acquisition of renewable facilities and other energy projects while containing costs; regulatory matters; customer creditworthiness; total incomeelectric generating capacity available in Southern Power's market areas; Southern Power's ability to successfully remarket capacity as current contracts expire; renewable portfolio standards; continued availability of federal and state ITCs and PTCs, which could be impacted by future tax benefitlegislation; transmission constraints; cost of $264 milliongeneration from units within the Southern Company power pool; and operational limitations. See "Income Tax Matters" herein for information regarding the IRA's expansion of the availability of federal ITCs and PTCs. Also see Notes 10 and 15 to the financial statements for additional information.
The level of future earnings for Southern Company Gas' primary business of distributing natural gas and its complementary businesses in the fourth quarter 2017.gas pipeline investments and gas marketing services sectors depends on numerous factors. These factors include the natural gas distribution utilities' ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs, including those related to projected long-term demand growth, safety, system reliability and resiliency, natural gas, and capital expenditures, including expanding and improving the natural gas distribution systems; the completion and subsequent operation of ongoing infrastructure and other construction projects; customer creditworthiness; and certain policies to limit the use of natural gas, such as the potential in Illinois and across certain other parts of the U.S. for state or municipal bans on the use of natural gas or policies designed to promote electrification. The volatility of natural gas prices has an impact on Southern Company Gas' customer rates, its long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services business to capture value from locational and seasonal spreads. Additionally, changes in commodity prices, primarily driven by tight gas supplies, geopolitical events, and diminished gas production, subject a portion of Southern Company Gas' operations to earnings variability and may result in higher natural gas prices. Additional economic factors may contribute to this environment. The demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis. Alternatively, a significant drop in oil and natural gas prices could lead to a consolidation of natural gas producers or reduced levels of natural gas production.
Earnings for both the electricity and natural gas businesses are subject to a variety of other factors. These factors include weather; competition; developing new and maintaining existing energy contracts and associated load requirements with wholesale customers; customer energy conservation practices; the use of alternative energy sources by customers; government incentives to reduce overall energy usage; fuel, labor, and material prices in an environment of heightened inflation and material and labor supply chain disruptions; and the price elasticity of demand. Demand for electricity and natural gas in the Registrants' service territories is primarily driven by the pace of economic growth or decline that may be affected by changes in regional and global economic conditions, which may impact future earnings.
Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023.
As part of its ongoing effort to adapt to changing market conditions, Southern Company continues to evaluate and consider a wide array of potential business strategies. These strategies may include business combinations, partnerships, and acquisitions involving other utility or non-utility businesses or properties, disposition of, or the sale of interests in, certain assets or businesses, internal restructuring, or some combination thereof. Furthermore, Southern Company may engage in new business ventures that arise from competitive and regulatory changes in the utility industry. Pursuit of any of the above strategies, or any combination thereof, may significantly affect the business operations, risks, and financial condition of Southern Company. In addition, Southern Power and Southern Company Gas regularly consider and evaluate joint development arrangements as well as acquisitions and dispositions of businesses and assets as part of their business strategies. See Note 515 to the financial statements for additional information.
Environmental Matters
The Southern Company system's business is influencedoperations are regulated by seasonal weather conditions.state and federal environmental agencies through a variety of laws and regulations governing air, water, land, avian and other wildlife and habitat protection, and other natural resources. The Southern Company system maintains comprehensive environmental compliance and GHG strategies to assess both current and upcoming requirements and compliance costs associated with these environmental laws and regulations. New or revised environmental laws and regulations could further affect many areas of operations for the Subsidiary Registrants. The costs required to comply with environmental laws and regulations and to achieve stated goals, including capital expenditures, operations and maintenance costs, and costs reflected in ARO liabilities, may impact future electric generating unit retirement and replacement decisions (which are generally subject to approval from the traditional electric operating companies' respective state PSCs), results of operations, cash flows, and/or financial condition. Related costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, or changing fuel sources for certain existing
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units, as well as related upgrades to the Southern Company system's transmission and distribution (electric and natural gas) systems. A major portion of these costs is expected to be recovered through retail and wholesale rates, including existing ratemaking and billing provisions. The ultimate impact of environmental laws and regulations and the GHG goals discussed herein cannot be determined at this time and will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed technology, fuel prices, the outcome of pending and/or future legal challenges and regulatory matters, and the ability to continue recovering the related costs, through rates for the traditional electric operating companies and the natural gas distribution utilities and/or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.
SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA
ForAlabama Power and Mississippi Power recover environmental compliance costs through separate mechanisms, Rate CNP Compliance and the Periods Ended December 2013ECO Plan, respectively. Georgia Power's base rates include an ECCR tariff that allows for the recovery of environmental compliance costs. The natural gas distribution utilities of Southern Company Gas generally recover environmental remediation expenditures through 2017rate mechanisms approved by their applicable state regulatory agencies. See Notes 2 and 3 to the financial statements for additional information.
Southern Power's PPAs generally contain provisions that permit charging the counterparty for some of the new costs incurred as a result of changes in environmental laws and regulations. Since Southern Power's units are generally newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and/or operating any type of existing or future facility. The impact of such laws, regulations, and other considerations on Southern Power and subsequent recovery through PPA provisions cannot be determined at this time.
Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity and natural gas, which could negatively affect results of operations, cash flows, and/or financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which may have the potential to affect their demand for electricity and natural gas.
Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, estimated capital expenditures through 2028 based on the current environmental compliance strategy for the Southern Company system and Subsidiary Companies 2017 Annual Reportthe traditional electric operating companies are as follows:
20242025202620272028Total
(in millions)
Southern Company$150 $141 $112 $92 $30 $525 
Alabama Power45 47 40 35 19 186 
Georgia Power92 80 60 32 10 274 
Mississippi Power13 13 12 26 65 
These estimates do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See "Environmental Laws and Regulations– Greenhouse Gases" and "– Water Quality" herein for additional information. The Southern Company system also anticipates substantial expenditures associated with ash pond closure and groundwater monitoring under the CCR Rule and related state rules, which are reflected in the applicable Registrants' ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein and Note 6 to the financial statements for additional information.
Environmental Laws and Regulations
Air Quality
Since 1990, the Southern Company system reduced SO2 and NOX air emissions by 99% and 92%, respectively, through 2022. Since 2005, the Southern Company system reduced mercury air emissions by 97% through 2022.
On February 13, 2023, the EPA published a final rule disapproving 19 state implementation plans (SIPs), including the States of Alabama and Mississippi, under the interstate transport (good neighbor) provisions of the Clean Air Act for the 2015 Ozone National Ambient Air Quality Standards (NAAQS). On March 14, 2023 and March 15, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the EPA's disapproval of the Mississippi SIP in the U.S. Court of Appeals for the
 2017
 
2016(a)

 2015
 2014
 2013
Operating Revenues (in millions)$23,031
 $19,896
 $17,489
 $18,467
 $17,087
Total Assets (in millions)(b)(c)
$111,005
 $109,697
 $78,318
 $70,233
 $64,264
Gross Property Additions (in millions)$5,984
 $7,624
 $6,169
 $6,522
 $5,868
Return on Average Common Equity (percent)(d)
3.44
 10.80
 11.68
 10.08
 8.82
Cash Dividends Paid Per Share of
 Common Stock
$2.3000
 $2.2225
 $2.1525
 $2.0825
 $2.0125
Consolidated Net Income Attributable to
   Southern Company (in millions)(d)
$842
 $2,448
 $2,367
 $1,963
 $1,644
Earnings Per Share —         
Basic$0.84
 $2.57
 $2.60
 $2.19
 $1.88
Diluted0.84
 2.55
 2.59
 2.18
 1.87
Capitalization (in millions):         
Common stock equity$24,167
 $24,758
 $20,592
 $19,949
 $19,008
Preferred and preference stock of subsidiaries and
   noncontrolling interests
1,361
 1,854
 1,390
 977
 756
Redeemable preferred stock of subsidiaries324
 118
 118
 375
 375
Redeemable noncontrolling interests
 164
 43
 39
 
Long-term debt(b)
44,462
 42,629
 24,688
 20,644
 21,205
Total (excluding amounts due within one year)$70,314
 $69,523
 $46,831
 $41,984
 $41,344
Capitalization Ratios (percent):         
Common stock equity34.4
 35.6
 44.0
 47.5
 46.0
Preferred and preference stock of subsidiaries and
   noncontrolling interests
1.9
 2.7
 3.0
 2.3
 1.8
Redeemable preferred stock of subsidiaries0.5
 0.2
 0.3
 0.9
 0.9
Redeemable noncontrolling interests
 0.2
 0.1
 0.1
 
Long-term debt(b)
63.2
 61.3
 52.6
 49.2
 51.3
Total (excluding amounts due within one year)100.0
 100.0
 100.0
 100.0
 100.0
Other Common Stock Data:         
Book value per share$23.99
 $25.00
 $22.59
 $21.98
 $21.43
Market price per share:         
High$53.51
 $54.64
 $53.16
 $51.28
 $48.74
Low46.71
 46.00
 41.40
 40.27
 40.03
Close (year-end)48.09
 49.19
 46.79
 49.11
 41.11
Market-to-book ratio (year-end) (percent)200.5
 196.8
 207.2
 223.4
 191.8
Price-earnings ratio (year-end) (times)57.3
 19.1
 18.0
 22.4
 21.9
Dividends paid (in millions)$2,300
 $2,104
 $1,959
 $1,866
 $1,762
Dividend yield (year-end) (percent)4.8
 4.5
 4.6
 4.2
 4.9
Dividend payout ratio (percent)273.2
 86.0
 82.7
 95.0
 107.1
Shares outstanding (in thousands):         
Average1,000,336
 951,332
 910,024
 897,194
 876,755
Year-end1,007,603
 990,394
 911,721
 907,777
 887,086
Stockholders of record (year-end)120,803
 126,338
 131,771
 137,369
 143,800
(a)The 2016 selected financial and operating data includes the operations of Southern Company Gas from the date of the Merger, July 1, 2016, through December 31, 2016. See Note 12 under "Merger with Southern Company Gas" for additional information.
(b)A reclassification of debt issuance costs from Total Assets to Long-term debt of $202 million and $139 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(c)A reclassification of deferred tax assets from Total Assets of $488 million and $143 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(d)A significant loss to income was recorded by Mississippi Power related to the suspension of the Kemper IGCC in June 2017. Earnings in all periods presented were impacted by losses related to the Kemper IGCC.
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Fifth Circuit. On June 8, 2023, the U.S. Court of Appeals for the Fifth Circuit stayed the EPA's disapproval of the Mississippi SIP, pending appeal. On April 13, 2023 and April 14, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the EPA's disapproval of the Alabama SIP in the U.S. Court of Appeals for the Eleventh Circuit. On August 17, 2023, the U.S. Court of Appeals for the Eleventh Circuit stayed the EPA's disapproval of the Alabama SIP, pending appeal.
SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA (continued)On June 5, 2023, the EPA published the 2015 Ozone NAAQS Good Neighbor federal implementation plan (FIP), which requires reductions in NOX emissions from sources in 23 states, including Alabama and Mississippi, to assure those states satisfy their Clean Air Act good neighbor obligations for the 2015 Ozone NAAQS. Georgia and North Carolina have approved interstate transport SIPs addressing the 2015 Ozone NAAQS and are not subject to this rule. On June 16, 2023 and June 27, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the FIP for Mississippi in the U.S. Court of Appeals for the Fifth Circuit. On August 4, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the FIP for Alabama in the U.S. Court of Appeals for the Eleventh Circuit. Both cases are being held in abeyance pending resolution of the Mississippi SIP disapproval and Alabama SIP disapproval cases, respectively.
ForIn July and September 2023, the Periods EndedEPA published an Interim Final Rule and an updated Interim Final Rule that stays the implementation of the FIPs for states with judicially stayed SIP disapprovals, including Mississippi and Alabama, respectively. The Interim Final Rule revises the existing regulations to maintain currently applicable trading programs for those states.
The ultimate impact of the rule and associated legal matters cannot be determined at this time; however, implementation of the FIPs will likely result in increased compliance costs for the traditional electric operating companies.
Water Quality
In 2020, the EPA published the final steam electric ELG reconsideration rule (ELG Reconsideration Rule), a reconsideration of the 2015 ELG rule's limits on bottom ash transport water and flue gas desulfurization wastewater that extended the latest applicability date for both discharges to December 201331, 2025. The ELG Reconsideration Rule also updated the voluntary incentive program and provided new subcategories for low utilization electric generating units and electric generating units that will permanently cease coal combustion by 2028. On March 29, 2023, the EPA published a proposed ELG Supplemental Rule revising certain effluent limits of the 2020 and 2015 ELG rules. The proposal imposes more stringent requirements for flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate to be met no later than December 31, 2029. The EPA is also proposing that a limited number of facilities already achieving compliance with the 2020 ELG Reconsideration Rule be allowed to elect retirement or repowering by December 31, 2032 as opposed to meeting the new more stringent requirements. The proposal maintains the 2020 ELG Reconsideration Rule's permanent cessation of coal combustion subcategory allowing units to continue to operate until the end of 2028 without having to install additional technologies. The proposal also maintains the Voluntary Incentive Program (VIP) subcategory, which allows units to comply with VIP limits by December 31, 2028. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
As required by the ELG Reconsideration Rule, in 2021, Alabama Power and Georgia Power each submitted initial notices of planned participation (NOPP) for applicable units seeking to qualify for these cessation of coal combustion or VIP subcategories that require compliance by December 31, 2028.
Alabama Power submitted its NOPP to the Alabama Department of Environmental Management (ADEM) indicating plans to retire Plant Barry Unit 5 (700 MWs) and to cease using coal and begin operating solely on natural gas at Plant Barry Unit 4 (350 MWs) and Plant Gaston Unit 5 (880 MWs). Alabama Power, as agent for SEGCO, indicated plans to retire Plant Gaston Units 1 through 20174 (1,000 MWs). However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. The NOPP submittals are subject to the review of the ADEM. Plant Barry Unit 4 ceased using coal and began to operate solely on natural gas in December 2022. See Notes 2 and 7 to the financial statements under "Georgia Power – Integrated Resource Plans" and "SEGCO," respectively, for additional information.
Southern CompanyThe remaining assets for which Alabama Power has indicated retirement, due to early closure or repowering of the unit to natural gas, have net book values totaling approximately $1.2 billion (excluding capitalized asset retirement costs which are recovered through Rate CNP Compliance) at December 31, 2023. Based on an Alabama PSC order, Alabama Power is authorized to establish a regulatory asset to record the unrecovered investment costs, including the plant asset balance and Subsidiary Companies 2017 Annual Reportthe site removal and closure costs, associated with unit retirements caused by environmental regulations (Environmental Accounting Order). Under the Environmental Accounting Order, the regulatory asset would be amortized and recovered over an affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance. See Note 2 to the financial statements under "Alabama Power – Rate CNP Compliance" and " – Environmental Accounting Order" for additional information.
 2017
 
2016(a)

 2015
 2014
 2013
Operating Revenues (in millions):         
Residential$6,515
 $6,614
 $6,383
 $6,499
 $6,011
Commercial5,439
 5,394
 5,317
 5,469
 5,214
Industrial3,262
 3,171
 3,172
 3,449
 3,188
Other114
 55
 115
 133
 128
Total retail15,330
 15,234
 14,987
 15,550
 14,541
Wholesale2,426
 1,926
 1,798
 2,184
 1,855
Total revenues from sales of electricity17,756
 17,160
 16,785
 17,734
 16,396
Natural gas revenues3,791
 1,596
 
 
 
Other revenues1,484
 1,140
 704
 733
 691
Total$23,031
 $19,896
 $17,489
 $18,467
 $17,087
Kilowatt-Hour Sales (in millions):         
Residential50,536
 53,337
 52,121
 53,347
 50,575
Commercial52,340
 53,733
 53,525
 53,243
 52,551
Industrial52,785
 52,792
 53,941
 54,140
 52,429
Other846
 883
 897
 909
 902
Total retail156,507
 160,745
 160,484
 161,639
 156,457
Wholesale sales49,034
 37,043
 30,505
 32,786
 26,944
Total205,541
 197,788
 190,989
 194,425
 183,401
Average Revenue Per Kilowatt-Hour (cents):         
Residential12.89
 12.40
 12.25
 12.18
 11.89
Commercial10.39
 10.04
 9.93
 10.27
 9.92
Industrial6.18
 6.01
 5.88
 6.37
 6.08
Total retail9.80
 9.48
 9.34
 9.62
 9.29
Wholesale4.95
 5.20
 5.89
 6.66
 6.88
Total sales8.64
 8.68
 8.79
 9.12
 8.94
Average Annual Kilowatt-Hour         
Use Per Residential Customer11,618
 12,387
 13,318
 13,765
 13,144
Average Annual Revenue         
Per Residential Customer$1,498
 $1,541
 $1,630
 $1,679
 $1,562
Plant Nameplate Capacity         
Ratings (year-end) (megawatts)46,936
 46,291
 44,223
 46,549
 45,502
Maximum Peak-Hour Demand (megawatts):         
Winter31,956
 32,272
 36,794
 37,234
 27,555
Summer34,874
 35,781
 36,195
 35,396
 33,557
System Reserve Margin (at peak) (percent)(b)
30.8
 34.2
 33.2
 19.8
 21.5
Annual Load Factor (percent)61.4
 61.5
 59.9
 59.6
 63.2
Plant Availability (percent):         
Fossil-steam84.5
 86.4
 86.1
 85.8
 87.7
Nuclear94.7
 93.3
 93.5
 91.5
 91.5
(a)The 2016 selected financial and operating data includes the operations of Southern Company Gas from the date of the Merger, July 1, 2016, through December 31, 2016. See Note 12 under "Merger with Southern Company Gas" for additional information.
(b)Beginning in 2014, system reserve margin is calculated to include unrecognized capacity.
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Georgia Power submitted its NOPP to the Georgia Environmental Protection Division (EPD) indicating plans to retire Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership), which occurred in August 2022, Plant Bowen Units 1 and 2 (1,400 MWs), and Plant Scherer Unit 3 (614 MWs based on 75% ownership) on or before the compliance date of December 31, 2028. Georgia Power also submitted a NOPP indicating plans to pursue compliance with the ELG Reconsideration Rule for Plant Scherer Units 1 and 2 (137 MWs based on 8.4% ownership) through the voluntary incentive program by no later than December 31, 2028. Georgia Power intends to comply with the ELG Rules for Plant Bowen Units 3 and 4 through the generally applicable requirements by December 31, 2025; therefore, no NOPP submission was required for these units. The NOPP submittals and generally applicable requirements are subject to the review of the Georgia EPD and decisions related to retirement or continued operation of units are subject to Georgia PSC approval. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA (continued)Coal Combustion Residuals
ForIn 2015, the Periods Ended December 2013EPA finalized non-hazardous solid waste regulations for the management and disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (ash ponds) at active electric generating power plants. The CCR Rule requires landfills and ash ponds to be evaluated against a set of performance criteria and potentially closed if certain criteria are not met. Closure of existing landfills and ash ponds requires installation of equipment and infrastructure to manage CCR in accordance with the CCR Rule. In addition to the federal CCR Rule, the States of Alabama and Georgia finalized state regulations regarding the management and disposal of CCR within their respective states. In 2019, the State of Georgia received partial approval from the EPA for its state CCR permitting program, which has broader applicability than the federal rule. The State of Mississippi has not developed a state CCR permit program.
On August 14, 2023, the EPA published a proposal to deny the ADEM's CCR permit program application. Alabama Power's permits to close its CCR facilities remain valid under state law. In the absence of an EPA-approved state permit program, CCR facilities in Alabama will remain subject to both the federal and state CCR rules.
The Holistic Approach to Closure: Part A rule, finalized in 2020, revised the deadline to stop sending CCR and non-CCR wastes to unlined surface impoundments to April 11, 2021 and established a process for the EPA to approve extensions to the deadline. The traditional electric operating companies stopped sending CCR and non-CCR wastes to their unlined impoundments prior to April 11, 2021 and, therefore, did not submit requests for extensions. Beginning in January 2022, the EPA issued numerous Part A determinations that state its current positions on a variety of CCR Rule compliance requirements, such as criteria for groundwater corrective action and CCR unit closure. The traditional electric operating companies are working with state regulatory agencies to determine whether the EPA's current positions may impact closure and groundwater monitoring plans.
In April 2022, the Utilities Solid Waste Activities Group and a group of generating facility operators filed petitions for review in the U.S. Court of Appeals for the D.C. Circuit challenging whether the EPA's January 2022 actions establish new legislative rules that should have gone through 2017notice-and-comment rulemaking. A decision by the court is expected in 2024. The ultimate impacts of the EPA's current positions are subject to the outcome of the pending litigation and any potential future rulemaking and cannot be determined at this time.
On May 18, 2023, the EPA published a proposed rule to establish two new categories of federally regulated CCR, legacy surface impoundments and CCR management units (CCRMUs). The proposal establishes accelerated compliance deadlines for legacy surface impoundments to meet regulatory requirements, including a requirement to initiate closure within 12 months after the effective date of the final rule. The EPA is also proposing a definition for CCRMUs. The EPA's proposal would also require facility evaluations to be completed at both active facilities and inactive facilities with one or more legacy surface impoundment to determine the presence or absence of CCRMUs. CCRMUs must comply with the CCR Rule's provisions for groundwater monitoring, corrective action, closure, and post-closure activities. On November 14, 2023, the EPA published a Notice of Data Availability supplementing the proposed rule, which sought comment on new data and a supplemental risk assessment that could be used to support final rulemaking. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
Based on requirements for closure and monitoring of landfills and ash ponds pursuant to the CCR Rule and applicable state rules, the traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to closure methodologies, schedules, and/or costs becomes available. Some of these updates have been, and future updates may be, material. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and Subsidiary Companies 2017 Annual Reportthe traditional electric operating companies could be materially impacted. See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements," Notes 2 and 3 to the financial statements under "Georgia Power – Rate Plans" and "General Litigation Matters – Alabama Power," respectively, and Note 6 to the financial statements for additional information.
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 2017
 
2016(a)

 2015
 2014
 2013
Source of Energy Supply (percent):         
Coal27.0
 30.3
 32.3
 39.3
 36.9
Nuclear14.5
 14.5
 15.2
 14.8
 15.5
Oil and gas41.9
 41.7
 42.7
 37.0
 37.2
Hydro2.1
 2.1
 2.6
 2.5
 3.9
Other5.4
 2.4
 0.8
 0.4
 0.1
Purchased power9.1
 9.0
 6.4
 6.0
 6.4
Total100.0
 100.0
 100.0
 100.0
 100.0
Gas Sales Volumes (mmBtu in millions):         
Firm667
 296
 
 
 
Interruptible95
 53
 
 
 
Total762
 349
 
 
 
Traditional Electric Operating Company
   Customers (year-end) (in thousands):
         
Residential4,011
 3,970
 3,928
 3,890
 3,859
Commercial(b)
599
 595
 590
 586
 582
Industrial(b)
18
 17
 17
 17
 17
Other12
 11
 11
 11
 9
Total electric customers4,640
 4,593
 4,546
 4,504
 4,467
Gas distribution operations customers4,623
 4,586
 
 
 
Total utility customers9,263
 9,179
 4,546
 4,504
 4,467
Employees (year-end)31,344
 32,015
 26,703
 26,369
 26,300

(a)The 2016 selected financial and operating data includes the operations of Southern Company Gas from the date of the Merger, July 1, 2016, through December 31, 2016. See Note 12 under "Merger with Southern Company Gas" for additional information.
(b)A reclassification of customers from commercial to industrial is reflected for years 2013-2015 to be consistent with the rate structure approved by the Georgia PSC. The impact to operating revenues, kilowatt-hour sales, and average revenue per kilowatt-hour by class is not material.


COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS

Greenhouse Gases
ALABAMA POWER COMPANYOn May 23, 2023, the EPA published proposed GHG standards and state plan guidelines for fossil fuel-fired power plants, which would require GHG limits for subcategories of both new and existing units based on technologies such as carbon capture and sequestration, low-GHG hydrogen co-firing, and natural gas co-firing. The proposed standards for new combustion turbines include subcategories for different operational uses including peaking, intermediate, and base load. Compliance with new source standards, once finalized, begins when the unit comes online. The proposed state plan guidelines for existing units include subcategories based on unit type, retirement date, size, and capacity factor. The EPA is proposing a 24-month state plan submission deadline for the existing unit implementation and may allow states to implement some limited form of trading and averaging for the state plans. Existing source compliance is proposed to begin as early as January 1, 2030, depending on the unit type and subcategory. The EPA also proposes to simultaneously repeal the Affordable Clean Energy rule. On November 17, 2023, the EPA published a final rule updating the regulations governing the processes and timelines for state and federal plans to implement existing source GHG performance standards. While this rule establishes the general requirements and timelines for states to follow in implementing the EPA's emissions guidelines, the pending final rule for GHG emissions from fossil fuel-fired power plants is expected to include schedules and other implementation requirements that will supersede these general provisions. On November 20, 2023, the EPA published a Supplemental Notice of Proposed Rulemaking for the pending rules for fossil fuel-fired power plants requesting additional input on how the EPA should address reliability concerns in the final rules. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
FINANCIAL SECTIONIn 2021, the United States officially rejoined the Paris Agreement. The Paris Agreement establishes a non-binding universal framework for addressing GHG emissions based on nationally determined emissions reduction contributions and sets in place a process for tracking progress towards the goals every five years. In 2021, President Biden announced a new target for the United States to achieve a 50% to 52% reduction in economy-wide GHG emissions from 2005 levels by 2030. The target was accepted by the United Nations as the United States' nationally determined emissions reduction contribution under the Paris Agreement.
Additional GHG policies, including legislation, may emerge in the future requiring the United States to accelerate its transition to a lower GHG emitting economy; however, associated impacts are currently unknown. The Southern Company system has transitioned from an electric generating mix of 70% coal and 15% natural gas in 2007 to a mix of 17% coal and 54% natural gas in 2023. This transition has been supported in part by the Southern Company system retiring over 6,700 MWs of coal-fired generating capacity since 2010 and converting 3,700 MWs of generating capacity from coal to natural gas since 2015. In addition, the Southern Company system's capacity mix consists of over 11,600 MWs of renewable and storage facilities through ownership and long-term PPAs. See "Environmental Laws and Regulations – Water Quality" hereinfor information on plans to retire or convert to natural gas additional coal-fired generating capacity. In addition, Southern Company Gas has replaced over 6,000 miles of pipe material that was more prone to fugitive emissions (unprotected steel and cast-iron pipe), resulting in mitigation of more than 3.3 million metric tons of CO2 equivalents from its natural gas distribution system since 1998.
The following table provides the Registrants' 2022 and preliminary 2023 Scope 1 GHG emissions based on equity share of facilities:
2022Preliminary 2023
(in million metric tons of CO2 equivalent)
Southern Company(*)
8580
Alabama Power(*)
3528
Georgia Power2324
Mississippi Power99
Southern Power1313
Southern Company Gas(*)
22
(*)Includes GHG emissions attributable to disposed assets through the date of the applicable disposition and to acquired assets beginning with the date of the applicable acquisition. See Note 15 to the financial statements for additional information.
Southern Company system management has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Based on the preliminary 2023 emissions, the Southern Company system has achieved an estimated GHG emission reduction of 49% since 2007. GHG emissions decreased in 2023 when compared to 2022 as coal generation was displaced by lower carbon generation, including from Plant Vogtle Unit 3, as discussed further under RESULTS OF OPERATIONS – "Southern Company – Electricity Business" herein. Southern Company system management expects to achieve GHG reductions of greater than 50% as early as 2025, five years earlier than the established interim goal, and remain close to 50% through the late 2020s, followed thereafter by continued reductions. While none
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of Southern Company's subsidiaries are currently subject to renewable portfolio standards or similar requirements, management of the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. Southern Company system management plans to continue to pursue a diverse portfolio including low-carbon and carbon-free resources and energy efficiency resources; continue to transition the Southern Company system's generating fleet and make the necessary related investments in transmission and distribution systems; implement initiatives to reduce natural gas distribution operational emissions; continue its research and development with a particular focus on technologies that lower GHG emissions, including methods of removing carbon from the atmosphere; and constructively engage with policymakers, regulators, investors, customers, and other stakeholders to support outcomes leading to a net zero future.
MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Alabama Power Company 2017 Annual ReportEnvironmental Remediation
The managementSouthern Company system must comply with environmental laws and regulations governing the handling and disposal of Alabama Powerwaste and releases of hazardous substances. Under these various laws and regulations, the Southern Company (the Company) is responsiblesystem could incur substantial costs to clean up affected sites. The traditional electric operating companies and Southern Company Gas conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in their financial statements. Amounts for establishingcleanup and maintaining an adequate systemongoing monitoring costs were not material for any year presented. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia (which represent substantially all of internal control over financial reportingSouthern Company Gas' accrued remediation costs) have all received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as requirednecessary within limits approved by the Sarbanes-Oxley Act of 2002state PSCs or other applicable state regulatory agencies. The traditional electric operating companies and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assuranceSouthern Company Gas may be liable for some or all required cleanup costs for additional sites that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of the Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that the Company's internal control over financial reporting was effective as of December 31, 2017.

/s/ Mark A. Crosswhite
Mark A. Crosswhite
Chairman, President, and Chief Executive Officer

/s/ Philip C. Raymond
Philip C. Raymond
Executive Vice President, Chief Financial Officer, and Treasurer
February 20, 2018


REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholders and the Board of Directors of Alabama Power Company
Opinion on the Financial Statements
We have audited the accompanying balance sheets and statements of capitalization of Alabama Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, the related statements of income, comprehensive income, common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2017, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements (pages II-186 to II-231) present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flowsunder "Environmental Remediation" for each of the three years in the period ended December 31, 2017, in conformity with accounting principles generally accepted in the United States of America.additional information.
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
/s/ Deloitte & Touche LLP
Birmingham, Alabama
February 20, 2018
We have served as the Company's auditor since 2002.

DEFINITIONS
TermMeaning
AFUDCAllowance for funds used during construction
AROAsset retirement obligation
ASCAccounting Standards Codification
ASUAccounting Standards Update
CCRCoal combustion residuals
Clean Air ActClean Air Act Amendments of 1990
CO2
Carbon dioxide
DOEU.S. Department of Energy
EPAU.S. Environmental Protection Agency
FASBFinancial Accounting Standards Board
FERCFederal Energy Regulatory Commission
GAAPU.S. generally accepted accounting principles
Georgia PowerGeorgia Power Company
Gulf PowerGulf Power Company
IRSInternal Revenue Service
ITCInvestment tax credit
KWHKilowatt-hour
LIBORLondon Interbank Offered Rate
Mississippi PowerMississippi Power Company
mmBtuMillion British thermal units
Moody'sMoody's Investors Service, Inc.
MWMegawatt
NDRNatural Disaster Reserve
NOX
Nitrogen oxide
NRCU.S. Nuclear Regulatory Commission
OCIOther comprehensive income
power poolThe operating arrangement whereby the integrated generating resources of the traditional electric operating companies and Southern Power (excluding subsidiaries) are subject to joint commitment and dispatch in order to serve their combined load obligations
PPAPower purchase agreement
PSCPublic Service Commission
Rate CNPRate Certificated New Plant
Rate CNP ComplianceRate Certificated New Plant Compliance
Rate CNP PPARate Certificated New Plant Power Purchase Agreement
Rate ECRRate Energy Cost Recovery
Rate NDRRate Natural Disaster Reserve
Rate RSERate Stabilization and Equalization plan
ROEReturn on equity
S&PS&P Global Ratings, a division of S&P Global Inc.
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECU.S. Securities and Exchange Commission
SEGCOSouthern Electric Generating Company
SO2
Sulfur dioxide
Southern CompanyThe Southern Company
Southern Company GasSouthern Company Gas and its subsidiaries

DEFINITIONS
(continued)

TermMeaning
Southern Company systemSouthern Company, the traditional electric operating companies, Southern Power, Southern Company Gas (as of July 1, 2016), SEGCO, Southern Nuclear, SCS, Southern Linc, PowerSecure, Inc. (as of May 9, 2016), and other subsidiaries
Southern LincSouthern Communications Services, Inc.
Southern NuclearSouthern Nuclear Operating Company, Inc.
Southern PowerSouthern Power Company and its subsidiaries
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
traditional electric operating companiesAlabama Power Company, Georgia Power, Gulf Power, and Mississippi Power

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Alabama Power Company 2017 Annual Report
OVERVIEW
Business Activities
Southern Company is a holding company that owns all of the common stock of three traditional electric operating companies, Southern Power, and Southern Company Gas and owns other direct and indirect subsidiaries. The primary businesses of the Southern Company system are electricity sales by the traditional electric operating companies and Southern Power and the distribution of natural gas by Southern Company Gas. Southern Company's reportable segments are the sale of electricity by the traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. See Note 16 to the financial statements for additional information.
The traditional electric operating companies – Alabama Power, Company (the Company) operates as aGeorgia Power, and Mississippi Power – are vertically integrated utilityutilities providing electric service to retail and wholesale customers within its traditional service territory located in the State of Alabamathree Southeastern states in addition to wholesale customers in the Southeast.
ManySouthern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Power continually seeks opportunities to execute its strategy to create value through various transactions including acquisitions, dispositions, and sales of partnership interests, development and construction of new generating facilities, and entry into PPAs primarily with investor-owned utilities, IPPs, municipalities, electric cooperatives, and other load-serving entities, as well as commercial and industrial customers. In general, Southern Power commits to the construction or acquisition of new generating capacity only after entering into or assuming long-term PPAs for the new facilities.
Southern Company Gas is an energy services holding company whose primary business is the distribution of natural gas. Southern Company Gas owns natural gas distribution utilities in four states – Illinois, Georgia, Virginia, and Tennessee – and is also involved in several other complementary businesses. Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services, which includes SouthStar, a Marketer and provider of energy-related products and services to natural gas markets – and one non-reportable segment, all other. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' reportable segments also included wholesale gas services. See Notes 7, 15, and 16 to the financial statements for additional information.
Southern Company's other business activities include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications. Management continues to evaluate the contribution of each of these activities to total shareholder return and may pursue acquisitions, dispositions, and other strategic ventures or investments accordingly.
See FUTURE EARNINGS POTENTIAL herein for a discussion of many factors affectthat could impact the opportunities, challenges,Registrants' future results of operations, financial condition, and risksliquidity.
Recent Developments
Alabama Power
On March 24, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with the acquisition of the Company's businessCentral Alabama Generating Station. The filing reflected an annual increase in retail revenues of providing electric$78 million, or 1.1%, effective with June 2023 billings. Through May 2023, Alabama Power recovered substantially all costs associated with the Central Alabama Generating Station through Rate RSE, offset by revenues from a power sales agreement. On May 24, 2023, the Central Alabama Generating Station was placed into retail service. These factorsOn November 1, 2023, Alabama Power placed Plant Barry Unit 8 in service. On December 1, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with Plant Barry Unit 8. The filing reflected an annual increase in retail revenues of $91 million, or 1.4%, effective with January 2024 billings.
On June 14, 2023, the Alabama PSC issued an order approving modifications to Alabama Power's Renewable Generation Certificate. The modifications authorized Alabama Power to procure an additional 2,400 MWs of renewable capacity and energy by June 14, 2029 and to market the related energy and environmental attributes to customers and other third parties. The modifications also increased the size of allowable renewable projects from 80 MWs to 200 MWs and increased the annual approval limit from 160 MWs to 400 MWs.
On July 11, 2023, the Alabama PSC issued an order authorizing Alabama Power to expand the existing authority of its reliability reserve to include the abilitycertain production-related expenses that are intended to maintain reliability in between scheduled generating unit maintenance outages.
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On August 18, 2023, Alabama Power notified the Alabama PSC of its intent to use a constructive regulatory environment,portion of its reliability reserve balance in 2023. During the fourth quarter 2023, Alabama Power used $75 million of the reliability reserve for reliability-related transmission, distribution, and generation expenses and nuclear production-related expenses. At December 31, 2023, Alabama Power accrued $52 million to maintain and grow energy sales and customers, and to effectively manage and secure timely recovery of costs. These costs include thoseits reliability reserve.
On October 3, 2023, the Alabama PSC issued an order modifying its December 2022 order related to excess federal accumulated deferred income taxes and authorizing Alabama Power to (i) flow back in 2023 approximately $24 million of certain federal excess accumulated deferred income taxes resulting from the Tax Cuts and Jobs Act of 2017 and (ii) make available any remaining balance of excess accumulated deferred income taxes at the end of 2023 for the benefit of customers in 2024 and/or 2025. At December 31, 2023, the remaining balance was $81 million, of which approximately $67 million and $14 million will flow back in 2024 and 2025, respectively, for the benefit of customers.
On November 9, 2023, the Alabama PSC approved a decrease to Rate ECR of approximately $126 million annually, effective with December 2023 billings.
On December 1, 2023, Alabama Power submitted calculations to the Alabama PSC for Rate CNP Compliance for 2024, which resulted in an annual revenue decrease of approximately $23 million, or 0.3%, effective with January 2024 billings.
For the year ended December 31, 2023, Alabama Power's weighted common equity return exceeded 6.15%, resulting in Alabama Power establishing a current regulatory liability of $15 million for Rate RSE refunds, which will be refunded to customers through bill credits in April 2024.
See Note 2 to the financial statements under "Alabama Power" for additional information.
Georgia Power
Plant Vogtle Units 3 and 4 Construction and Start-Up Status
Georgia Power placed Plant Vogtle Unit 3 in service on July 31, 2023 and continues construction on Plant Vogtle Unit 4 (each with electric generating capacity of approximately 1,100 MWs), in which it holds a 45.7% ownership interest. Georgia Power's share of the total project capital cost forecast to complete Plant Vogtle Units 3 and 4, including contingency, through the second quarter 2024 is $10.8 billion.
Hot functional testing for Unit 4 was completed on May 1, 2023. On July 20, 2023, Southern Nuclear announced that all Unit 4 ITAACs had been submitted to the NRC, and, on July 28, 2023, the NRC published its 103(g) finding that the accepted criteria in the combined license for Unit 4 had been met, which allowed nuclear fuel to be loaded and start-up testing to begin. Fuel load for Unit 4 was completed on August 19, 2023. On October 6, 2023, Georgia Power announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified a motor fault in one of four reactor coolant pumps (RCPs). This RCP was replaced with an on-site spare RCP from inventory.
On February 1, 2024, Georgia Power announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified, and has remediated, vibrations associated with certain piping within the cooling system. Considering the remaining pre-operational testing, Unit 4 is projected long-term demand growth, stringent environmental standards, reliability, fuel, capital expenditures,to be placed in service during the second quarter 2024. On February 14, 2024, Unit 4 achieved self-sustaining nuclear fission, commonly referred to as initial criticality. The projected schedule for Unit 4 significantly depends on the progression of start-up and restoration following major storms. The Companypre-operational testing, which may be impacted by equipment or other operational failures. In addition, any findings related to the root cause of the motor fault on the single Unit 4 RCP could require engineering changes or remediation related to the other seven Unit 3 and Unit 4 RCPs. Any further delays could result in a later in-service date and cost increases.
As of December 31, 2023, based on completion of construction work and the assessment of start-up and pre-operational testing remaining, Southern Nuclear has various regulatory mechanisms that operatean estimated $36 million for construction contingency remaining in the estimate to complete. This contingency is projected to be allocated in the future to address any further Unit 4 schedule extensions or remediation of other issues discovered during start-up testing.
In September 2022, Georgia Power and MEAG Power reached an agreement to resolve a dispute regarding the cost-sharing and tender provisions of the Global Amendments (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"). Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project capital cost recovery. Effectively operatingforecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the current project capital cost forecast, with no further adjustment for force majeure costs.
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On October 5, 2023 and October 17, 2023, Georgia Power reached agreements with OPC and Dalton, respectively, to resolve its respective dispute with each of OPC and Dalton regarding the cost-sharing and tender provisions of the Global Amendments. Under the terms of the agreements with OPC and Dalton, among other items, (i) each of OPC and Dalton retracted its exercise of the tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4, (ii) Georgia Power made payments immediately after execution of the agreements of $308 million and $17 million to OPC and Dalton, respectively, representing payment for a portion of each of OPC's and Dalton's costs of construction for Plant Vogtle Units 3 and 4 previously incurred, (iii) Georgia Power will pay a portion of each of OPC's and Dalton's further costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will be in an aggregate amount of approximately $105 million and $6 million for OPC and Dalton, respectively, based on the current project capital cost forecast, and (iv) Georgia Power will pay 66% of each of OPC's and Dalton's costs of construction with respect to any amounts above the current project capital cost forecast, with no further adjustment for force majeure costs.
Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing provisions of the Global Amendments, including the settlement with MEAG Power. Based on the current project capital cost forecast and the settlements with OPC and Dalton described above, Georgia Power recorded a pre-tax charge to income of approximately $160 million ($120 million after tax) in the third quarter 2023. These charges are included in the total project capital cost forecast and will not be recovered from retail customers.
The ultimate impact of these matters on the construction schedule for Plant Vogtle Unit 4 and project capital cost forecast for Plant Vogtle Units 3 and 4 cannot be determined at this time. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Plant Vogtle Units 3 and 4 Rate and Prudency Proceedings
In compliance with a Georgia PSC order approved in 2021, Georgia Power increased annual retail base rates by $318 million effective August 1, 2023 based on the in-service date of July 31, 2023 for Unit 3.
On December 19, 2023, the Georgia PSC voted to approve the application to adjust rates to include reasonable and prudent Plant Vogtle Units 3 and 4 costs (Application) as modified by the related stipulated agreement (Prudency Stipulation) among Georgia Power, the staff of the Georgia PSC, and certain intervenors.
Under the terms of the approved Prudency Stipulation, Georgia Power will recover $7.562 billion in total construction and capital costs and associated retail rate base items of $1.02 billion, which includes AFUDC financing costs above $4.418 billion (the Georgia PSC-certified amount) up to $7.562 billion. Georgia Power will also recover projected operations and maintenance expenses, depreciation expense, nuclear decommissioning accruals, and property taxes, net of projected PTCs. After considering construction and capital costs already in retail base rates of $2.1 billion and $362 million of associated retail rate base items (approved by the Georgia PSC in 2021) and upon achieving commercial operation of Unit 4, Georgia Power will include in retail rate base the remaining $5.462 billion of construction and capital costs as well as $656 million of associated retail rate base items.
Under the Prudency Stipulation, if commercial operation for Unit 4 is not achieved by March 31, 2024, Georgia Power's ROE used to determine the NCCR tariff and calculate AFUDC will be reduced to zero, which will result in an estimated negative impact to earnings of approximately $30 million per month until the month following the date commercial operation for Unit 4 is achieved. The ultimate outcome of this matter cannot be determined at this time.
Annual retail base revenues will increase approximately $729 million and the average retail base rates will be adjusted by approximately 5% (net of the elimination of the NCCR tariff described above) effective the first day of the month after Unit 4 achieves commercial operation.
The approval of the Application and the Prudency Stipulation resolves all issues for determination by the Georgia PSC regarding the reasonableness, prudence, and cost recovery for the remaining Plant Vogtle Units 3 and 4 construction and capital costs not already in retail base rates.
As a result of the Georgia PSC's approval of the Prudency Stipulation, Georgia Power recorded a pre-tax credit to income of approximately $228 million ($170 million after tax) in the fourth quarter 2023 to recognize CWIP costs previously charged to income, which are now recoverable through retail rates. Associated AFUDC on these costs was also recognized.
See Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Regulatory Matters" for additional information.
Rate Plans
On November 16, 2023, in accordance with the terms of the 2022 ARP, the Georgia PSC approved tariff adjustments effective January 1, 2024 that resulted in a net increase in rates of $191 million.
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Georgia Power expects to submit a compliance filing in the fourth quarter 2024 to request tariff adjustments approved pursuant to these regulatory mechanismsthe 2022 ARP effective January 1, 2025. The ultimate outcome of this matter cannot be determined at this time.
See Note 2 to the financial statements under "Georgia Power – Rate Plans – 2022 ARP" for additional information.
Fuel Cost Recovery
On May 16, 2023, the Georgia PSC approved a stipulation agreement between Georgia Power and appropriately balancing required coststhe staff of the Georgia PSC to increase annual fuel billings by 54%, or approximately $1.1 billion, effective June 1, 2023. The increase reflects a three-year recovery period for $2.2 billion of Georgia Power's under recovered fuel balance at May 31, 2023. Changes in fuel rates have no significant effect on Southern Company's or Georgia Power's net income but do impact the related operating cash flows. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Integrated Resource Plans
On October 27, 2023, Georgia Power filed an updated IRP (2023 IRP Update) with the Georgia PSC, which sets forth a plan to support the recent increase in the state of Georgia's projected energy needs since the 2022 IRP. Georgia Power expects the Georgia PSC to render a final decision on the 2023 IRP Update on April 16, 2024. The ultimate outcome of this matter cannot be determined at this time. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Mississippi Power
On October 27, 2023, the FERC approved a settlement agreement filed by Mississippi Power and capital expendituresCooperative Energy on July 31, 2023 related to Mississippi Power's July 2022 request for a $23 million increase in annual wholesale base revenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and a refund to customers of approximately $6 million primarily related to the difference between the approved rates and interim rates.
In October 2023, Mississippi Power signed an affiliate PPA with customer pricesGeorgia Power for 750 MWs of capacity, which began January 1, 2024 and will continue through December 2028. In order to challengefulfill this PPA and serve the interests of customers, Mississippi Power now expects electric generating units identified in its 2021 IRP to remain in service beyond the previously indicated dates. Mississippi Power is expected to file its next IRP in April 2024 in accordance with the rules and orders of the Mississippi PSC. The ultimate outcome of this matter cannot be determined at this time.
On February 6, 2024, the Mississippi PSC approved Mississippi Power's request to increase retail fuel revenues by $18 million annually effective with the first billing cycle of March 2024.
On February 12, 2024, Mississippi Power submitted its annual ECO Plan filing to the Mississippi PSC, which requested a $9 million annual increase in revenues. The ultimate outcome of this matter cannot be determined at this time.
See Note 2 to the financial statements under "Mississippi Power" for additional information.
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Southern Power
On September 20, 2023, Southern Power acquired 100% of the membership interests in the 200-MW Millers Branch solar project located in Haskell County, Texas from EDF Renewables Development, Inc. and is continuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to occur in the fourth quarter 2025. The project includes an option to expand capacity up to an additional 300 MWs. Subsequent to December 31, 2023, Southern Power committed to expand the construction of the facility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the second quarter 2026.
On September 22, 2023, Southern Power acquired 100% of the membership interests in the 150-MW South Cheyenne solar project located in Laramie County, Wyoming from Hanwha Q Cells USA Corp. and is continuing construction. The facility's output is contracted under a 20-year PPA and commercial operation is expected to occur in the second quarter 2024.
The ultimate outcome of these matters cannot be determined at this time.
Southern Power calculates an investment coverage ratio for its generating assets, including those owned with various partners, based on the ratio of investment under contract to total investment using the respective facilities' net book value (or expected in-service value for facilities under construction) as the investment amount. With the inclusion of investments associated with facilities under construction, as well as other capacity and energy contracts, Southern Power's average investment coverage ratio at December 31, 2023 was 97% through 2028 and 89% through 2033, with an average remaining contract duration of approximately 12 years.
See Note 15 to the financial statements under "Southern Power" for additional information.
Southern Company Gas
On June 15, 2023, the Illinois Commission concluded its review of the Qualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the second quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an $8 million reduction to revenues and $30 million in estimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a rehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and an equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to be completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the fourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be postponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined in the Illinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to the Illinois Commission's rate case ruling.
Any further cost disallowances by the Illinois Commission in the pending cases could be material to the financial statements of Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
On December 19, 2023, the Georgia PSC approved Atlanta Gas Light's annual GRAM filing, which resulted in an annual base rate increase of $53 million effective January 1, 2024.
On February 1, 2024, Atlanta Gas Light filed its triennial Integrated Capacity and Delivery Plan (i-CDP) with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the foreseeable future.next 10 years (2025 through 2034), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected
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capital investments totaling approximately $0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order on this matter in the third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
On August 28, 2023, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for a $48 million increase in annual base rate revenues based on a ROE of 9.70% and an equity ratio of 49.06%. Interim rates became effective as of January 1, 2023, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $69 million. Refunds to customers related to the difference between the approved rates effective September 1, 2023 and the interim rates were completed during the fourth quarter 2023.
On February 9, 2024, Virginia Natural Gas filed with the Virginia Commission a request to extend the existing SAVE program through 2029. The request includes investments of $70 million in each year from 2025 through 2029, with a potential variance of up to $5 million allowed for the program, for a maximum total investment over the five-year extension (2025 through 2029) of $355 million. Virginia Natural Gas expects the Virginia Commission to issue a final order on this matter in the second quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Key Performance Indicators
In striving to achieve attractive risk-adjusted returns while providing cost-effective energy to approximately 8.9 million electric and gas utility customers collectively, the traditional electric operating companies and Southern Company continuesGas continue to focus on several key performance indicators. These indicators including,include, but are not limited to, customer satisfaction, plant availability, electric and natural gas system reliability, and execution of major construction projects. In addition, Southern Company and the Subsidiary Registrants focus on earnings per share (EPS) and net income, after dividendsrespectively, as a key performance indicator. See RESULTS OF OPERATIONS herein for information on preferredthe Registrants' financial performance.
The financial success of the traditional electric operating companies and preference stock. The Company's financial successSouthern Company Gas is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. Management usesThe traditional electric operating companies use customer satisfaction surveys to evaluate the Company'stheir results and generally targetstarget the top quartile of these surveys in measuring performance. Reliability indicators are also used to evaluate results. See Note 2 to the financial statements under "Alabama Power – Rate RSE" and "Mississippi Power – Performance Evaluation Plan" for additional information on Alabama Power's Rate RSE and Mississippi Power's PEP rate plan, respectively, both of which contain mechanisms that directly tie customer service indicators to the allowed equity return.
Southern Company Gas also continues to focus on several operating metrics, including Heating Degree Days, customer count, and volumes of natural gas sold. Southern Company Gas measures weather and the effect on its business using Heating Degree Days. Generally, increased Heating Degree Days result in higher demand for natural gas on Southern Company Gas' distribution system. See RESULTS OF OPERATIONS herein– "Southern Company Gas" for additional information on Southern Company Gas' operating metrics.
Southern Power continues to focus on several key performance indicators, including, but not limited to, the Company's financial performance.equivalent forced outage rate and contract availability to evaluate operating results and help ensure its ability to meet its contractual commitments to customers.
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The Company's 2017
COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
RESULTS OF OPERATIONS
Southern Company
Consolidated net income after dividends on preferred and preference stockattributable to Southern Company was $848 million, representing a $26$4.0 billion in 2023, an increase of $452 million, or 3.2%12.8%, increase over the previous year.from 2022. The increase was primarily due to lower non-fuel operations and maintenance costs, an increase in retail electric revenues associated with rates under Rate RSE effectiveand pricing, a decrease in January 2017income tax expense, a decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and the impact of4, an increase in other revenues, an increase in natural gas revenues from rate increases and continued infrastructure replacement, and a Rate RSE refund recordedgoodwill impairment charge in 2016. These increases to income were2022 at PowerSecure, partially offset by higher depreciation and amortization, higher interest expense, and a decrease in retail electric revenues associated with milder weather lower customer usage, and an increase in non-fuel operations and maintenance expenses in 2017 as2023 compared to 2016.2022. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Rate RSE" herein for additional information.
The Company's 2016 net income after dividends on preferredNotes 1 and preference stock was $822 million, representing a $37 million, or 4.7%, increase over the previous year. The increase was due primarily to an increase in retail revenues under Rate CNP Compliance, an increase in weather-related revenues, and a decrease in operations and maintenance expenses not related to fuel or Rate CNP Compliance. These increases to income were partially offset by an accrual for a Rate RSE refund, a decrease in AFUDC equity, and an increase in depreciation.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

RESULTS OF OPERATIONS
A condensed income statement for the Company follows:
 Amount 
Increase (Decrease)
from Prior Year
 2017 2017 2016
 (in millions)
Operating revenues$6,039
 $150
 $121
Fuel1,225
 (72) (45)
Purchased power328
 (6) (17)
Other operations and maintenance1,652
 142
 9
Depreciation and amortization736
 33
 60
Taxes other than income taxes384
 4
 12
Total operating expenses4,325
 101
 19
Operating income1,714
 49
 102
Allowance for equity funds used during construction39
 11
 (32)
Interest expense, net of amounts capitalized305
 3
 28
Other income (expense), net(14) 7
 11
Income taxes568
 37
 25
Net income866
 27
 28
Dividends on preferred and preference stock18
 1
 (9)
Net income after dividends on preferred and preference stock$848
 $26
 $37
Operating Revenues
Operating revenues for 2017 were $6.0 billion, reflecting a $150 million increase from 2016. Details of operating revenues were as follows:
 Amount
 2017 2016
 (in millions)
Retail — prior year$5,322
 $5,234
Estimated change resulting from —   
Rates and pricing362
 147
Sales decline(44) (20)
Weather(89) 31
Fuel and other cost recovery(93) (70)
Retail — current year5,458
 5,322
Wholesale revenues —   
Non-affiliates276
 283
Affiliates97
 69
Total wholesale revenues373
 352
Other operating revenues208
 215
Total operating revenues$6,039
 $5,889
Percent change2.6% 2.1%
Retail revenues in 2017 were $5.5 billion. These revenues increased $136 million, or 2.6%, in 2017 and $88 million, or 1.7%, in 2016, each as compared to the prior year. The increase in 2017 was primarily due to an increase in rates under Rate RSE effective in January 2017, partially offset by a decrease in fuel revenues and milder weather in the first and third quarters 2017

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

as compared to the corresponding periods in 2016. The increase in 2016 was due to an increase in revenues under Rate CNP Compliance as a result of increased net investments, partially offset by a decrease in fuel revenues and an accrual for a Rate RSE refund. See Note 32 to the financial statements under "Retail Regulatory Matters"Goodwill and Other Intangible Assets" and "Georgia PowerRate RSE"Nuclear Construction," respectively, for additional information.
Basic EPS was $3.64 in 2023 and $3.28 in 2022. Diluted EPS, which factors in additional shares related to stock-based compensation, was $3.62 in 2023 and $3.26 in 2022. EPS for 2023 and 2022 was negatively impacted by $0.06 and $0.04 per share, respectively, as a result of increases in the average shares outstanding. See Note 8 to the financial statements under "Outstanding Classes of Capital Stock – Southern Company" for additional information.
Dividends paid per share of common stock were $2.78 in 2023 and $2.70 in 2022. In January 2024, Southern Company declared a quarterly dividend of 70 cents per share. For 2023, the dividend payout ratio was 76% compared to 82% for 2022.
Discussion of Southern Company's results of operations is divided into three parts – the Southern Company system's primary business of electricity sales, its gas business, and its other business activities.
20232022
(in millions)
Electricity business$3,994 $3,672 
Gas business615 572 
Other business activities(633)(720)
Net Income$3,976 $3,524 
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Electricity Business
Southern Company's electric utilities generate and sell electricity to retail and wholesale customers. A condensed statement of income for the electricity business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Electric operating revenues$19,998 $(2,875)
Fuel4,365 (2,470)
Purchased power883 (710)
Cost of other sales171 57 
Other operations and maintenance4,679 (550)
Depreciation and amortization3,865 836 
Taxes other than income taxes1,159 34 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total electric operating expenses15,054 (3,054)
Operating income4,944 179 
Allowance for equity funds used during construction247 37 
Interest expense, net of amounts capitalized1,274 207 
Other income (expense), net533 17 
Income taxes583 (265)
Net income3,867 291 
Less:
Dividends on preferred stock of subsidiaries (11)
Net loss attributable to noncontrolling interests(127)(20)
Net Income Attributable to Southern Company$3,994 $322 
Electric Operating Revenues
Electric operating revenues for 2023 were $20.0 billion, reflecting a $2.9 billion, or 12.6%, decrease from 2022. Details of electric operating revenues were as follows:
 20232022
 (in millions)
Retail electric — prior year$18,197 
Estimated change resulting from —
Rates and pricing437 
Sales decline(33)
Weather(229)
Fuel and other cost recovery(2,029)
Retail electric — current year$16,343 $18,197 
Wholesale electric revenues2,467 3,641 
Other electric revenues792 747 
Other revenues396 288 
Electric operating revenues$19,998 $22,873 
Retail electric revenues decreased $1.9 billion, or 10.2%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing in 2023 was primarily due to base tariff increases in accordance with Georgia Power's 2022 ARP, revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
retail ROE range, an increase in Rate CNP Compliance revenues at Alabama Power, and a lower Rate RSE customer refund accrual in 2023 compared to 2022 at Alabama Power, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in the revenues recognized under the NCCR tariff, both at Georgia Power.
Electric rates for the traditional electric operating companies include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of PPA costs, and do not affect net income. The traditional electric operating companies each have one or more regulatory mechanisms to recover other costs such as environmental and other compliance costs, storm damage, new plants, and PPA capacity costs.
See Note 2 to the financial statements under "Alabama Power" and "Georgia Power" for additional information. Also see "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales decline and weather.
Fuel rates billedWholesale electric revenues from power sales were as follows:
20232022
 (in millions)
Capacity and other$630 $625 
Energy1,837 3,016
Total$2,467 $3,641 
In 2023, wholesale electric revenues decreased $1.2 billion, or 32.2%, as compared to customers are designed2022 primarily due to fully recover fluctuatinga decrease in energy revenues. Energy revenues decreased $884 million at Southern Power and $295 million at the traditional electric operating companies primarily due to fuel and purchased power costs overprice decreases compared to 2022. Also contributing to the Southern Power decrease was a periodnet decrease in the volume of time. FuelKWHs sold primarily associated with natural gas PPAs.
Wholesale electric revenues consist of revenues from PPAs and short-term opportunity sales. Wholesale electric revenues from PPAs (other than solar and wind PPAs) have both capacity and energy components. Capacity revenues generally have no effect onrepresent the greatest contribution to net income because they represent the recordingand are designed to provide recovery of fixed costs plus a return on investment. Energy revenues to offset fuel and purchased power expenses. See Note 3 to the financial statements under "Retail Regulatory Matters – Rate ECR" for additional information.
Wholesale revenues from power sales to non-affiliated utilities were as follows:
 2017 2016 2015
 (in millions)
Capacity and other$154
 $154
 $140
Energy122
 129
 101
Total non-affiliated$276
 $283
 $241
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of the Company's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affecthave a significant impact on net income. Short-term opportunityEnergy sales from solar and wind PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or through a fixed price related to the energy. As a result, the ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Wholesale electric revenues at Mississippi Power include FERC-regulated MRA sales are also included in wholesale energy sales to non-affiliates. Theseunder cost-based tariffs as well as market-based sales. Short-term opportunity sales are made at market-based rates that generally provide a margin above the Company'sSouthern Company system's variable cost to produce the energy.
In 2017, wholesaleOther Electric Revenues
Other electric revenues from sales to non-affiliates decreased $7increased $45 million, or 2.5%6.0%, in 2023 as compared to the prior year. In 2016, wholesale revenues from sales to non-affiliates increased $42 million, or 17.4%, as compared to the prior year2022. The increase was primarily due to a $28increases of $23 million increase in revenuesoutdoor lighting sales at Georgia Power, $18 million resulting from energy salesreceipts of liquidated damages associated with generation facility production guarantees and a $14an arbitration award at Southern Power, $17 million increase in capacity revenues. In 2016, KWH sales increased 33.3% primarily due to a new contract that became effectiverealized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs at Georgia Power, and $17 million in the first quarter 2016retail solar program fees at Georgia Power, partially offset by a 12.1% decreasedecreases of $25 million in the price of energy due tocogeneration steam revenues associated with lower natural gas prices.
Wholesaleprices at Alabama Power and $14 million in rent revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resourcesprimarily at each company. These affiliate sales and purchases are made in accordance with the Intercompany Interchange Contract (IIC), as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through the Company's energy cost recovery clause.
In 2017, wholesale revenues from sales to affiliates increased $28 million, or 40.6%, as compared to the prior year. In 2017, KWH sales increased 31.1% as a result of supporting Southern Company system transmission reliability and a 6.9% increase in the price of energy primarily due to higher natural gas prices. In 2016, wholesale revenues from sales to affiliates decreased $15 million, or 17.9%, as compared to the prior year. In 2016, KWH sales decreased 15.7% as a result of lower-cost generation available in the Southern Company system and a 2.6% decrease in the price of energy primarily due to lower natural gas prices.Alabama Power.
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Alabama Power Company 2017 Annual Report

Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 20172023 and the percent change from the prior year2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential47.1 (5.1)%(0.5)%
Commercial48.3 0.1 1.3 
Industrial48.6 (1.9)(1.9)
Other0.5 (7.2)(6.8)
Total retail144.5 (2.3)(0.4)%
Wholesale51.0 (9.4)
Total energy sales195.5 (4.3)%
 
Total
KWHs
 
Total KWH
Percent Change
 
Weather-Adjusted
Percent Change
 2017 2017 2016 2017 2016
 (in billions)        
Residential17.2
 (6.1)% 1.4% (1.2)% (0.5)%
Commercial13.6
 (3.4) (0.1) (1.3) (0.5)
Industrial22.7
 1.7
 (4.6) 1.7
 (4.6)
Other0.2
 (5.0) 3.8
 (5.0) 3.8
Total retail53.7
 (2.3) (1.5) (0.1)% (2.2)%
Wholesale         
Non-affiliates5.5
 (6.5) 37.1
    
Affiliates4.2
 31.1
 (15.7)    
Total wholesale9.7
 6.6
 12.5
    
Total energy sales63.4
 (1.0)% 0.3%    
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in the applicable service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, changes in weather, and changes in the number of customers. RetailWeather-adjusted retail energy sales decreased 587 million KWHs in 2017 were 2.3% lower than in 2016. Residential sales and commercial2023 as compared to 2022. Weather-adjusted residential KWH sales decreased 6.1% and 3.4% in 2017, respectively,0.5% primarily due to milder weather in the first and third quarters 2017 as compared to the corresponding periods in 2016. Weather-adjusted residential sales were 1.2% lower in 2017 primarily due to lowerdecreased customer usage, resulting from an increase in penetration of energy-efficient residential appliances, partially offset by customer growth. Weather-adjusted commercial KWH sales wereincreased 1.3% lower in 2017 primarily due to lowerincreased customer usage resulting from customer initiatives in energy savings and an ongoing migration to the electronic commerce business model, partially offset by customer growth. Industrial KWH sales increased 1.7% in 2017 as compared to 2016 as a result of an increase in demand resulting from changes in production levels primarily in the primary metals, chemicals, and mining sectors offset by the pipelines and paper sectors.
Retail energy sales in 2016 were 1.5% lower than in 2015. Residential sales increased 1.4%decreased 1.9% primarily due to warmer weatherdecreases in the third quarter 2016 as compared to the corresponding period in 2015. Commercial sales remained flat in 2016. Weather-adjusted residential sales were flat in 2016 due to lower customer usage primarily resulting from an increase in efficiency improvements in residential applianceschemicals, forest products, and lighting, partially offset by customer growth. Industrial sales decreased 4.6% in 2016 compared to 2015 as a result of a decrease in demand resulting from changes in production levels primarily in the primary metals, chemical, pipelines, paper, and stone, clay, and glasstextiles sectors. A strong dollar, low oil prices, and weak global growth conditions constrained growth in the industrial sector in 2016.
See "Operating"Electric Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies as related to changes in price and KWH sales.
Other Revenues
Other revenues increased $108 million, or 37.5%, in 2023 as compared to 2022. The increase was primarily due to increases of $54 million in power delivery construction and maintenance projects at Georgia Power, $34 million in unregulated sales of products and services at Alabama Power, and $25 million associated with energy conservation projects at Georgia Power.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for the Company. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, the Company purchaseselectric utilities purchase a portion of itstheir electricity needs from the wholesale market.
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Alabama Power Company 2017 Annual Report

Details of the Company'sSouthern Company system's generation and purchased power were as follows:
2017 2016 2015
Total generation (in billions of KWHs)
60.3
 60.2
 60.9
202320232022
Total generation (in billions of KWHs)(a)(b)
Total purchased power (in billions of KWHs)
6.4
 7.1
 6.3
Sources of generation (percent)
     
Sources of generation (percent)(a)
Gas
Gas
Gas
Nuclear(b)
Coal50
 53
 54
Nuclear24
 23
 24
Gas20
 19
 16
Hydro6
 5
 6
Wind, Solar, and Other
Cost of fuel, generated (in cents per net KWH)
     
Gas(a)
Gas(a)
Gas(a)
Nuclear(b)
Coal2.60
 2.75
 2.83
Nuclear0.75
 0.78
 0.81
Gas2.72
 2.67
 2.94
Average cost of fuel, generated (in cents per net KWH)(a)
2.14
 2.26
 2.34
Average cost of purchased power (in cents per net KWH)(b)
5.29
 4.80
 5.66
Average cost of fuel, generated (in cents per net KWH)(a)(b)
Average cost of purchased power (in cents per net KWH)(c)
(a)KWHs generated by hydro are excluded from the average cost of fuel, generated.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by the Company for tolling agreements where power is generated by the provider.
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(c)Average cost of purchased power includes fuel purchased by the Southern Company system for tolling agreements where power is generated by the provider.
In 2023, total fuel and purchased power expenses were $5.2 billion, a decrease of $3.2 billion, or 37.7%, as compared to 2022. The decrease was primarily the result of a $2.7 billion decrease in the average cost of fuel generated and purchased and a $513 million net decrease in the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions at the traditional electric operating companies are generally offset by fuel revenues and do not have a significant impact on net income. See Note 2 to the financial statements for additional information. Fuel expenses were $1.55incurred under Southern Power's PPAs are generally the responsibility of the counterparties and do not significantly impact net income.
Fuel
In 2023, fuel expense was $4.4 billion, in 2017, a decrease of $78 million,$2.5 billion, or 4.8%36.1%, as compared to 2016.2022. The decrease was primarily due to a $67 million net decrease related to the volume of KWHs generated and purchased and a $42 million47.6% decrease in the average cost of fuel,natural gas per KWH generated and a 22.5% decrease in the volume of KWHs generated by coal, partially offset by a $31 millionan 18.2% decrease in the volume of KWHs generated by hydro, an 18.0% increase in the average cost of purchased power.coal per KWH generated, a 10.8% increase in the volume of KWHs generated by nuclear, and a 6.9% increase in the volume of KWHs generated by natural gas.
Fuel andPurchased Power
In 2023, purchased power expenses were $1.63 billion in 2016,expense was $883 million, a decrease of $62$710 million, or 3.7%44.6%, as compared to 2015.2022. The decrease was primarily due to a $61 million32.5% decrease in the average cost ofper KWH purchased power,primarily due to lower natural gas prices and a $59 million27.5% decrease in the average cost of fuel, partially offset by a $49 million increase related to the volume of KWHs purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through the Company's energy cost recovery clause. The Company, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 3 to the financial statements under "Retail Regulatory Matters – Rate ECR" for additional information.
Energy purchases from non-affiliates will vary depending on demand for energy within the Southern Company system's electric service territory, the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
FuelCost of Other Sales
Fuel expenses were $1.2 billion in 2017, a decreaseCost of $72other sales increased $57 million, or 5.6%50.0%, in 2023 as compared to 2016.2022. The decreaseincrease was primarily due to a 12.2% increase in the volumeincreases of KWHs generated by hydro, a 5.8% decrease in the volume of KWHs generated by coal,$40 million from unregulated power delivery construction and a 5.5%maintenance projects at Georgia Power and 3.9% decrease in the average cost of KWHs generated by coal and nuclear fuel, respectively. These decreases were partially offset by an 8.1% increase in the volume of KWHs generated by nuclear fuel and a 4.0% increase in the volume of KWHs generated by natural gas. Fuel expenses were $1.3 billion in 2016, a decrease of $45 million, or 3.4%, compared to 2015. The decrease was primarily due to a 9.2% decrease in the average cost of KWHs generated by natural gas, which excludes tolling agreements, a 4.2% and 3.9% decrease in the volume of KWHs generated by nuclear fuel and coal, respectively, and a 3.7% decrease in the average cost of KWHs generated by nuclear fuel, partially offset by a 17.4% increase in the volume of KWHs generated by natural gas.
Purchased Power Affiliates
Purchased power expense from affiliates was $158$20 million in 2017, a decrease of $10 million, or 6.0%, comparedexpenses related to 2016. This decrease was primarily due to a 17.2% decrease in the amount of energy purchased due to milder weather partially offset by a 13.9% increase in the average cost per KWH purchased due to higher natural gas prices. Purchased power expense from affiliates was $168 million in 2016, a decrease of $12 million, or 6.7%, compared to 2015. This decrease was primarily due to aunregulated products and services at Alabama Power.
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Alabama Power Company 2017 Annual Report

20.7% decrease in the average cost per KWH purchased due to lower natural gas prices, partially offset by a 17.5% increase in the amount of energy purchased due to the availability of lower-cost generation compared to the Company's owned generation.
Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
In 2017, otherOther operations and maintenance expenses increased $142decreased $550 million, or 9.4%10.5%, in 2023 as compared to 2022. The decrease reflects a decrease of $189 million associated with the prior year. Distributionreliability reserve accruals and transmission expenses increased $58reliability-related expenditures incurred at Alabama Power. Excluding this decrease, there were decreases of $223 million primarily due to vegetation management expenses. Generation costs increased $38 million primarily due to outage costs. Employee benefit costs, including pension costs, increased $22 million.
In 2016, other operations and maintenance expenses increased $9 million, or 0.6%, as compared to the prior year. Steam production costs increased $28 million primarily due to the timing of generation operating expenses. Transmissionin transmission and distribution expenses increased $10primarily related to line maintenance, $182 million in storm damage recovery as authorized in Georgia Power's 2022 ARP, $91 million in generation non-outage maintenance expenses and $7planned outages, and $50 million respectively, primarily due to additional vegetation managementin employee compensation and other maintenance expenses. These increases werebenefit expenses, partially offset by a decrease of $32an $86 million increase in employee benefit costs, including pension costs. The increases in operationstechnology infrastructure and maintenance expenses were primarily Rate CNP compliance-relatedapplication production costs and therefore had no significant impact to net income. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Rate CNP Compliance" herein for additional information.
a $73 million increase in generation environmental projects primarily at Georgia Power. See Note 21 to the financial statements under "Pension Plans""Storm Damage and Reliability Reserves" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $33$836 million, or 4.7%27.6%, in 20172023 as compared to the prior year2022. The increase was primarily due to increases of $541 million and $190 million resulting from higher depreciation rates at Alabama Power and Georgia Power, respectively, and $79 million from additional plant in service and an increase in generation-related depreciation rates, effective January 1, 2017, associated with compliance-related steam projects and ARO recovery, partially offset by a decrease in distribution-related depreciation rates.service. See Note 12 to the financial statements under "Depreciation and Amortization""Alabama Power – Rate CNP Depreciation" for additional information. Depreciation and amortization increased $60 million, or 9.3%, in 2016 as compared to the prior year primarily due to compliance-related steam projects placed in service.
Taxes Other Than Income Taxes
Taxes other than income taxes increased $4$34 million, or 1.1%3.0%, in 20172023 as compared to the prior year. In 2016, taxes other than income taxes increased $12 million, or 3.3% in 2016 as compared to the prior year.2022. The increase was primarily due to increases of $62 million in state and municipal utility license tax basesproperty taxes primarily due toat Georgia Power resulting from an increase in retail revenues. In addition, ad valorem taxes increased primarily due to an increase inthe assessed value of property.property and $14 million in utility license taxes at Alabama Power, partially offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues at Georgia Power.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income for the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect Georgia Power's revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
AFUDCAllowance for equity funds used during construction increased $11$37 million, or 39.3%17.6%, in 20172023 as compared to the prior year.2022. The increase was primarily associated with steam, transmission,an increase in capital expenditures subject to AFUDC at Georgia Power and nuclearan increase in capital expenditures related to hydro production and Plant Barry Unit 8 construction projects. AFUDC equity decreased $32 million, or 53.3%, in 2016 as compared to the prior year. The decrease was primarily associated with steam generation capital projects being placed in service.at Alabama Power. See Note 12 to the financial statements under "Allowance for Funds Used During Construction""Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $3$207 million, or 1.0%19.4%, in 20172023 as compared to the prior year. Interest expense, net of amounts capitalized increased $282022. The increase reflects approximately $120 million or 10.2%, in 2016 as comparedrelated to higher interest rates and $96 million related to higher average outstanding borrowings. See Note 8 to the prior year primarily due to an increase in debt outstanding and a reduction in the amounts capitalized. See FUTURE EARNINGS POTENTIAL – "Financing Activities" hereinfinancial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $7$17 million, or 33.3%3.3%, in 20172023 as compared to 2022 primarily due to a $48 million decrease in charitable donations primarily at Georgia Power, a $15 million increase in interest income, and a $14 million decrease in non-operating benefit-related expenses at Alabama Power, partially offset by a $42 million decrease in non-service cost-related retirement benefits income and a $13 million decrease in customer charges related to contributions in aid of construction at Georgia Power. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $265 million, or 31.3%, in 2023 as compared to 2022. The decrease was primarily due to a $252 million increase in the flowback of certain excess deferred income taxes at Alabama Power, an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards at Georgia Power, generation of $35 million of advanced nuclear PTCs at Georgia Power, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward at Georgia Power, partially offset by a $145 million decrease in the flowback of certain excess deferred income taxes at Georgia Power that ended in 2022. See Note 10 to the financial statements for additional information.
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Net Loss Attributable to Noncontrolling Interests
Substantially all noncontrolling interests relate to renewable projects at Southern Power. Net loss attributable to noncontrolling interests increased $20 million, or 18.7%, in 2023 as compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to Southern Power's wind tax equity partners and $5 million in lower income allocations to Southern Power's equity partners, partially offset by $10 million in lower HLBV loss allocations to Southern Power's battery energy storage partners.
Gas Business
Southern Company Gas distributes natural gas through utilities in four states and is involved in several other complementary businesses including gas pipeline investments and gas marketing services.
A condensed statement of income for the gas business follows:
 2023Increase (Decrease) from 2022
 (in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Income taxes211 31 
Net income$615 $43 
During the period from November through March when natural gas usage and operating revenues are generally higher (Heating Season), more customers are connected to Southern Company Gas' distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively equally over any given year. Thus, operating results can vary significantly from quarter to quarter as a result of seasonality. For 2023, the percentage of operating revenues and net income generated during
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the Heating Season (January through March and November through December) were 67% and 73%, respectively. For 2022, the percentage of operating revenues and net income generated during the Heating Season were 67% and 66%, respectively.
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Southern Company Gas hedged its exposure to warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. The remaining impacts of weather on earnings were immaterial.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, the natural gas distribution utilities rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at the natural gas distribution utilities represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, in 2023 compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses increased $18 million, or 1.5%, in 2023 compared to 2022. The increase was primarily due to increases of $70 million in unregulated lighting services. compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
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Depreciation and Amortization
Depreciation and amortization increased $23 million, or 4.1%, in 2023 compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes decreased $20 million, or 7.1%, in 2023 compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $47 million, or 17.9%, in 2023 compared to 2022. The increase reflects approximately $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
Income taxes increased $31 million, or 17.2%, in 2023 compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Other Business Activities
Southern Company's other business activities primarily include the parent company (which does not allocate operating expenses to business units); PowerSecure, which provides distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers; Southern Holdings, which invests in various projects; and Southern Linc, which provides digital wireless communications for use by the Southern Company system and also markets these services to the public and provides fiber optics services within the Southeast.
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A condensed statement of operations for Southern Company's other business activities follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$554 $110 
Cost of other sales355 87 
Other operations and maintenance175 (26)
Depreciation and amortization77 
Taxes other than income taxes4 — 
Impairment charges (119)
Gain on dispositions, net 14 
Total operating expenses611 (42)
Operating income (loss)(57)152 
Earnings from equity method investments5 
Interest expense863 171 
Other income (expense), net(16)39 
Income taxes (benefit)(298)(65)
Net loss$(633)$87 
Operating Revenues
Operating revenues for these other business activities increased $110 million, or 24.8%, in 2023 as compared to 2022 primarily due to increases of $92 million related to distributed infrastructure projects at PowerSecure and $24 million primarily related to sales associated with commercial customers at Southern Linc.
Cost of Other Sales
Cost of other sales for these other business activities increased $87 million, or 32.5%, in 2023 as compared to 2022 primarily due to increases of $58 million related to distributed infrastructure projects at PowerSecure and $23 million primarily related to sales associated with commercial customers at Southern Linc.
Other Operations and Maintenance
Other operations and maintenance expenses for these other business activities decreased $26 million, or 12.9%, in 2023 as compared to 2022 primarily due to a decrease at the parent company related to cost containment efforts and lower director compensation expenses.
Impairment Charges
In 2022, a goodwill impairment charge of $119 million was recorded at PowerSecure. See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information.
Gain on Dispositions, Net
In 2022, a $14 million gain was recorded at the parent company as a result of the early termination of the transition services agreement related to the 2019 sale of Gulf Power.
Interest Expense
Interest expense for these other business activities increased $171 million, or 24.7%, in 2023 as compared to 2022. The increase primarily results from parent company financing activities and includes approximately $112 million related to higher interest rates and $73 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
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Other Income (Expense), Net
Other income (expense), net for these other business activities increased $11$39 million, or 34.4%70.9%, in 20162023 as compared to 2022 primarily due to a $29 million decrease in charitable donations and a $12 million increase in interest income, both primarily at the prior yearparent company. See Note 15 to the financial statements under "Southern Company" for additional information.
Income Taxes (Benefit)
The income tax benefit for these other business activities increased $65 million, or 27.9%, in 2023 as compared to 2022. The increase was primarily due to a $35 million tax benefit in 2023 related to a reversal of an uncertain tax position associated with the 2019 sale of Gulf Power and higher pre-tax losses, both at the parent company.
Alabama Power
Alabama Power's 2023 net income after dividends on preferred stock was $1.37 billion, representing a $30 million, or 2.2%, increase from 2022. The increase was primarily due to a decrease in donations,income tax expense, an increase in Rate CNP Compliance revenues, a decrease in operations and maintenance expenses primarily related to the reliability reserve, and a lower Rate RSE customer refund accrual in 2023 compared to 2022. These increases to net income were offset by an increase in depreciation rates effective January 2023, a decrease in retail revenues associated with milder weather in Alabama Power's service territory in the first and second quarters of 2023 compared to the corresponding periods in 2022, and increases in capacity-related expenses and interest expense. See Note 2 to the financial statements under "Alabama Power" for additional information.
A condensed income statement for Alabama Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$7,050 $(767)
Fuel1,299 (541)
Purchased power504 (297)
Other operations and maintenance1,769 (166)
Depreciation and amortization1,401 526 
Taxes other than income taxes442 18 
Total operating expenses5,415 (460)
Operating income1,635 (307)
Allowance for equity funds used during construction82 12 
Interest expense, net of amounts capitalized425 43 
Other income (expense), net159 15 
Income taxes81 (342)
Net income1,370 19 
Dividends on preferred stock (11)
Net income after dividends on preferred stock$1,370 $30 
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Operating Revenues
Operating revenues for 2023 were $7.1 billion, reflecting a $767 million, or 9.8%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$6,470 
Estimated change resulting from —
Rates and pricing276 
Sales decline(33)
Weather(84)
Fuel and other cost recovery(470)
Retail — current year$6,159 $6,470 
Wholesale revenues —
Non-affiliates424 726 
Affiliates60 202 
Total wholesale revenues484 928 
Other operating revenues407 419 
Total operating revenues$7,050 $7,817 
Retail revenues decreased $311 million, or 4.8%, in 2023 as compared to 2022. The significant factors driving this change are shown in the preceding table. The decrease was primarily due to a decrease in fuel and other cost recovery, partially offset by an increase in revenues associated with rates and pricing primarily due to an increase in Rate CNP Compliance revenues and a lower Rate RSE customer refund accrual in 2023 compared to 2022.
See Note 2 to the financial statements under "Alabama Power – Rate ECR," " – Rate RSE," and " – Rate CNP Compliance" for additional information. See "Energy Sales" herein for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates include provisions to recognize the recovery of fuel costs, purchased power costs, PPAs certificated by the Alabama PSC, and costs associated with the NDR. Under these provisions, fuel and other cost recovery revenues generally equal fuel and other cost recovery expenses and do not affect net income. See Note 2 to the financial statements under "Alabama Power" for additional information.
Wholesale revenues from sales to non-affiliated utilities were as follows:
20232022
(in millions)
Capacity and other$163 $213 
Energy261 513 
Total non-affiliated$424 $726 
In 2023, wholesale revenues from sales to non-affiliates decreased $302 million, or 41.6%, as compared to 2022. The decrease reflects a 26.0% decrease in the volume of KWHs sold as a result of power sales agreements that ended in May 2023 and a 20.8% decrease in the price of energy primarily as a result of lower natural gas prices.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Alabama Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not affect net income. Short-term opportunity energy sales are also included in wholesale energy sales to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Alabama Power's variable cost to produce the energy.
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In 2023, wholesale revenues from sales to affiliates decreased $142 million, or 70.3%, as compared to 2022. The revenue decrease reflects a 47.7% decrease in the price of energy due to lower natural gas prices and a 42.9% decrease in KWH sales due to lower customer demand as a result of milder weather in 2023.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales and purchases are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost and energy purchases are generally offset by energy revenues through Alabama Power's energy cost recovery clause.
In 2023, other operating revenues decreased $12 million, or 2.9%, as compared to 2022 primarily due to decreases of $25 million in cogeneration steam revenue associated with lower natural gas prices and $17 million in rent revenues, partially offset by a $34 million increase in unregulated sales of products and services.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change(*)
(in billions)
Residential17.4 (5.7)%(0.9)%
Commercial12.9 (1.2)0.4 
Industrial20.4 (2.8)(2.8)
Other0.1 (15.5)(15.5)
Total retail50.8 (3.4)(1.3)%
Wholesale
Non-affiliates9.3 (26.0)
Affiliates2.1 (42.9)
Total wholesale11.4 (29.9)
Total energy sales62.2 (9.7)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from the normal temperature conditions. Normal temperature conditions are defined as those experienced in Alabama Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. In 2023, weather-adjusted residential KWH sales decreased 0.9% primarily due to decreased customer usage. Weather-adjusted commercial KWH sales increased 0.4% primarily due to increased customer usage and customer growth. Industrial KWH sales decreased 2.8% as a result of a decrease in demand resulting from changes in production levels primarily in the chemicals and forest products sectors.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues from sales to non-affiliates and wholesale revenues from sales to affiliated companies related to changes in price and KWH sales.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by the unit cost of fuel consumed, demand, and the availability of generating units. Additionally, Alabama Power purchases a portion of its electricity needs from the wholesale market.
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Details of Alabama Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
54.558.3 
Total purchased power (in billions of KWHs)
10.811.6 
Sources of generation (percent)(a)
Coal35 46 
Gas31 24 
Nuclear27 22 
Hydro7 
Cost of fuel, generated (in cents per net KWH)
Coal3.46 3.39 
Gas(a)
2.99 5.12 
Nuclear0.69 0.67 
Average cost of fuel, generated (in cents per net KWH)(a)
2.50 3.19 
Average cost of purchased power (in cents per net KWH)(b)
4.98 8.00 
(a)Excludes Central Alabama Generating Station KWHs and associated cost of fuel through July 12, 2022 as its fuel was previously provided by the purchaser under a power sales agreement. See Note 15 to the financial statements under "Alabama Power" for additional information.
(b)Average cost of purchased power includes fuel, energy, and transmission purchased by Alabama Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $1.8 billion in 2023, a decrease of $838 million, or 31.7%, compared to 2022. The decrease was primarily due to a $674 million decrease in the average cost of fuel and purchased power and a $164 milliondecrease related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through Alabama Power's energy cost recovery clause. Alabama Power, along with the Alabama PSC, continuously monitors the under/over recovered balance to determine whether adjustments to billing rates are required. See Note 2 to the financial statements under "Alabama Power – Rate ECR" for additional information.
Fuel
Fuel expense was $1.3 billion in 2023, a decrease of $541 million, or 29.4%, compared to 2022. The decrease was primarily due to a 41.6% decrease in the average cost of natural gas per KWH generated, which excludes tolling agreements, and a 29.1% decrease in the volume of KWHs generated by coal, partially offset by a 21.2% increase in the volume of KWHs generated by natural gas, an 18.9% decrease in the volume of KWHs generated by hydro facilities as a result of less rainfall in 2023, and a 13.6% increase in the volume of KWHs generated by nuclear.
Purchased Power Non-Affiliates
Purchased power expense from non-affiliates was $253 million in 2023, a decrease of $188 million, or 42.6%, compared to 2022. The decrease was primarily due to a 32.9% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 25.5% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power Affiliates
Purchased power expense from affiliates was $251 million in 2023, a decrease of $109 million, or 30.3%, compared to 2022. The decrease was primarily due to a 51.4% decrease in the average cost per KWH purchased primarily due to lower natural gas prices, partially offset by a 43.4% increase in the volume of KWHs purchased due to the availability of lower cost gas generation in the Southern Company system.
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Energy purchases from affiliates will vary depending on demand for energy and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $166 million, or 8.6%, in 2023 as compared to 2022. The change was primarily due to a decrease of $189 million associated with the reliability reserve accruals and reliability-related expenditures incurred, as well as decreases of $33 million in transmission and distribution expenses and $21 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $30 million in technology infrastructure and application production costs and $25 million in expenses related to unregulated products and services, as well as a $14 million decrease in nuclear property insurance refunds. See Note 2 to the financial statements under "Alabama Power – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $526 million, or 60.1%, in 2023 as compared to 2022 primarily due to an increase in depreciation rates effective in 2023. See Note 2 to the financial statements under "Alabama Power – Rate CNP Depreciation" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $12 million, or 17.1%, in 2023 as compared to 2022 primarily due to increases in capital expenditures related to hydro production and Plant Barry Unit 8 construction. See Note 2 to the financial statements under "Alabama Power – Rate CNP New Plant" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $43 million, or 11.3%, in 2023 as compared to 2022. The increase reflects approximately $30 million related to higher average outstanding borrowings and $20 million related to higher interest rates. See Note 8 to the financial statements for additional information.
Other Income (Expense), Net
Other income (expense), net increased $15 million, or 10.4%, in 2023 as compared to 2022 primarily due to a decrease in non-operating benefit-related expenses and an increase in interest income, partially offset by a decrease in salesnon-service cost-related retirement benefits income. See Note 11 to the financial statements for additional information.
Income Taxes
Income taxes decreased $342 million, or 80.9%, in 2023 as compared to 2022 primarily due to a $252 million increase in the flowback of non-utility property.certain excess deferred income taxes and an $84 million decrease due to lower pre-tax earnings. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" and Note 10to the financial statements for additional information.
Georgia Power
Georgia Power's 2023 net income was $2.1 billion, representing a $0.3 billion, or 14.7%, increase from the previous year. The increase was primarily due to lower non-fuel operations and maintenance costs, revenue reductions in 2022 as a result of Georgia Power exceeding its allowed retail return range, a $187 million decrease in after-tax charges related to the construction of Plant Vogtle Units 3 and 4, and an increase in other revenues, partially offset by a decrease in retail revenues associated with lower contributions from customers with variable demand-driven pricing and milder weather in 2023, as well as higher interest expense. Also contributing to the net income growth were the impacts of the 2022 ARP effective January 1, 2023, including increased retail rates, largely offset by higher depreciation and amortization. See Note 2 to the financial statements under "Georgia Power" for additional information.
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Alabama Power Company 2017 Annual Report

A condensed income statement for Georgia Power follows:
Income Taxes
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$10,118 $(1,466)
Fuel1,781 (705)
Purchased power1,281 (976)
Other operations and maintenance2,083 (266)
Depreciation and amortization1,681 251 
Taxes other than income taxes541 14 
Estimated loss on Plant Vogtle Units 3 and 4(68)(251)
Total operating expenses7,299 (1,933)
Operating income2,819 467 
Allowance for equity funds used during construction165 25 
Interest expense, net of amounts capitalized626 141 
Other income (expense), net170 (6)
Income taxes (benefit)448 78 
Net income$2,080 $267 
Income taxes increased $37 million,
Operating Revenues
Operating revenues for 2023 were $10.1 billion, reflecting a $1.5 billion, or 7.0%12.7%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$10,792 
Estimated change resulting from —
Rates and pricing172 
Sales decline(10)
Weather(141)
Fuel cost recovery(1,591)
Retail — current year$9,222 $10,792 
Wholesale revenues188 235 
Other operating revenues708 557 
Total operating revenues$10,118 $11,584 
Retail revenues decreased $1.6 billion, or 14.5%, in 20172023 as compared to 2022. The significant factors driving this change are shown in the prior yearpreceding table. The increase in rates and pricing was primarily due to base tariff increases in accordance with the 2022 ARP and revenue reductions in 2022 resulting from Georgia Power's retail ROE exceeding the allowed retail ROE range, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and a decrease in revenues recognized under the NCCR tariff. See Note 2 to the financial statements under "Georgia Power – Rate Plans" and " – Nuclear Construction" for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather in 2023.
Electric rates include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses and do not affect net income. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
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Wholesale revenues from power sales were as follows:
20232022
(in millions)
Capacity and other$66 $48 
Energy122 187 
Total$188 $235 
In 2023, wholesale revenues decreased $47 million, or 20.0%, as compared to 2022 largely due to an $81 million decrease related to the average cost per KWH sold due to lower Southern Company system fuel and purchased power costs, partially offset by a $21 million increase related to new capacity contracts and a $13 million increase related to the volume of KWH sales associated with higher pre-tax earnings,market demand.
Wholesale revenues from sales to non-affiliates consist of PPAs and short-term opportunity sales. Wholesale revenues from PPAs have both capacity and energy components. Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms and provide for recovery of fixed costs and a return on investment. Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Georgia Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in prior year tax return actualization,fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above Georgia Power's variable cost of energy.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues increased $151 million, or 27.1%, as compared to 2022 primarily due to an increase of $105 million in income tax reserves,unregulated sales associated with power delivery construction and maintenance, outdoor lighting, and energy conservation projects, a net increase of $17 million in realized gains associated with price stability products for retail customers on variable demand-driven pricing tariffs, an increase of $17 million in retail solar program fees, and a $9 million increase in open access transmission tariff sales.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2023 and the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted
Percent Change
(*)
(in billions)
Residential27.6 (5.0)%(0.4)%
Commercial32.6 0.1 1.2 
Industrial23.5 (1.6)(1.4)
Other0.4 (4.7)(4.2)
Total retail84.1 (2.1)(0.1)%
Wholesale2.6 7.8 
Total energy sales86.7 (1.9)%
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Georgia Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales decreased in 2023 when compared to 2022. Weather-adjusted residential sales decreased 0.4% primarily due to decreased customer usage, largely offset by customer growth. Weather-adjusted commercial KWH sales increased 1.2% primarily due to customer growth. Weather-adjusted industrial KWH sales decreased
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1.4% primarily due to decreases in the textile, mining, and stone, clay, and glass sectors, partially offset by an increase in statethe paper sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for Georgia Power. The mix of fuel sources for the generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Georgia Power purchases a portion of its electricity needs from the wholesale market.
Details of Georgia Power's generation and purchased power were as follows:
20232022
Total generation (in billions of KWHs)(a)
60.359.7 
Total purchased power (in billions of KWHs)
29.633.6 
Sources of generation (percent) —
Gas49 48 
Nuclear(a)
29 27 
Coal19 21 
Hydro and other3 
Cost of fuel, generated (in cents per net KWH)
Gas3.07 5.06 
Nuclear(a)
0.82 0.75 
Coal5.59 4.12 
Average cost of fuel, generated (in cents per net KWH)(a)
2.90 3.64 
Average cost of purchased power (in cents per net KWH)(b)
4.63 7.88 
(a)Excludes KWHs generated from test period energy at Plant Vogtle Unit 3 prior to its in-service date. The related fuel costs are charged to CWIP in accordance with FERC guidance. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
(b)Average cost of purchased power includes fuel purchased by Georgia Power for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $3.1 billion in 2023, a decrease of $1.7 billion, or 35.4%, compared to 2022. The decrease was due to decreases of $1.4 billion related to the average cost of fuel and purchased power and $321 million related to the volume of KWHs generated and purchased.
Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through Georgia Power's fuel cost recovery mechanism. See Note 2 to the financial statements under "Georgia Power – Fuel Cost Recovery" for additional information.
Fuel
Fuel expense was $1.8 billion in 2023, a decrease of $0.7 billion, or 28.4%, compared to 2022. The decrease was primarily due to decreases of 39.3% in the average cost per KWH generated by natural gas and 8.9% in the volume of KWHs generated by coal, partially offset by increases of 35.7% in the average cost per KWH generated by coal, 9.3% in the average cost per KWH generated by nuclear, 8.5% in the volume of KWHs generated by nuclear, and 2.1% in the volume of KWHs generated by natural gas.
Purchased Power – Non-Affiliates
Purchased power expense from non-affiliates was $517 million in 2023, a decrease of $339 million, or 39.6%, compared to 2022. The decrease was primarily due to a decrease of 33.9% in the volume of KWHs purchased due to lower demand and the availability of lower cost generation in the Southern Company system and a decrease of 22.3% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
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Purchased Power – Affiliates
Purchased power expense from affiliates was $764 million in 2023, a decrease of $637 million, or 45.5%, compared to 2022. The decrease was primarily due to a decrease of 49.1% in the average cost per KWH purchased primarily due to lower natural gas prices.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $266 million, or 11.3%, in 2023 as compared to 2022. The decrease was primarily due to decreases of $182 million in storm damage recovery as authorized in the 2022 ARP, $178 million in transmission and distribution expenses primarily associated with line maintenance, $74 million in generation non-outage maintenance expenses, and $28 million in certain employee compensation and benefit expenses. These decreases were partially offset by increases of $60 million from unregulated power delivery construction and maintenance and energy conservation projects, $59 million in generation environmental projects, $55 million in technology infrastructure and application production costs, and $28 million in planned generation outages. See Note 2 to the financial statements under "Georgia Power – Storm Damage Recovery" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $251 million, or 17.6%, in 2023 as compared to 2022 primarily due to increases of $190 million resulting from higher depreciation rates as authorized in the 2022 ARP and $75 million associated with additional plant in service, partially offset by a decrease of $15 million in amortization of regulatory assets related to the retirement of certain generating units that ended in 2022.
Taxes Other Than Income Taxes
Taxes other than income tax credits. The impacttaxes increased $14 million, or 2.7%, in 2023 as compared to 2022 primarily due to an increase of $56 million in property taxes primarily resulting from an increase in the assessed value of property, largely offset by a decrease of $40 million in municipal franchise fees resulting from lower retail revenues.
Estimated Loss on Plant Vogtle Units 3 and 4
Georgia Power recorded pre-tax charges (credits) to income taxesfor the estimated probable loss on Plant Vogtle Units 3 and 4 totaling $(68) million and $183 million in 2023 and 2022, respectively. The charges (credits) to income in each year were recorded to reflect revisions to the total project capital cost forecast to complete construction and start-up of Plant Vogtle Units 3 and 4 and the related cost recovery. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Allowance for Equity Funds Used During Construction
Allowance for equity funds used during construction increased $25 million, or 17.9%, in 2023 as a result of Tax Reform Legislation was not materialcompared to 2022 primarily due to an increase in capital expenditures subject to AFUDC.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $141 million, or 29.1%, in 2023 as compared to 2022. The increase primarily reflects approximately $78 million related to higher interest rates and $76 million related to higher average outstanding borrowings, partially offset by the applicationdeferral of regulatory accounting.$14 million in financing costs related to Plant Vogtle Unit 3. See FUTURE EARNINGS POTENTIALFINANCIAL CONDITION AND LIQUIDITY"Income Tax Matters – Federal Tax Reform Legislation""Sources of Capital" and "Financing Activities" herein and Note 58 to the financial statements for additional information. Also see Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
Other Income (Expense), Net
Other income (expense), net decreased $6 million, or 3.4%, in 2023 as compared to 2022 primarily due to decreases in non-service cost-related retirement benefits income and customer charges related to contributions in aid of construction, partially offset by a decrease in charitable donations. See Note 11 to the financial statements for additional information on Georgia Power's net periodic pension and other postretirement benefit costs.
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Income Taxes (Benefit)
Income taxes increased $25$78 million, or 4.9%21.1%, in 20162023 as compared to the prior year2022 primarily due to the flowback of $145 million of certain excess deferred income taxes that ended in 2022 and higher pre-tax earnings.earnings largely resulting from lower charges associated with the construction of Plant Vogtle Units 3 and 4, partially offset by an $85 million decrease in charges to a valuation allowance on certain state tax credit carryforwards, generation of $35 million of advanced nuclear PTCs, and a $32 million adjustment in 2022 related to a prior year state tax credit carryforward. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" and Note 10to the financial statements for additional information.
Dividends on Preferred
Mississippi Power
Mississippi Power's net income was $188 million in 2023 compared to $164 million in 2022. The increase was primarily due to an increase in affiliate wholesale capacity revenues, changes in power supply agreements, and Preference Stocka decrease in non-fuel operations and maintenance expenses, partially offset by an increase in interest expense.
Dividends on preferred and preference stock increased $1A condensed income statement for Mississippi Power follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$1,474 $(220)
Fuel and purchased power538 (251)
Other operations and maintenance362 (14)
Depreciation and amortization190 9 
Taxes other than income taxes124  
Total operating expenses1,214 (256)
Operating income260 36 
Interest expense, net of amounts capitalized71 15 
Other income (expense), net35 2 
Income taxes36 (1)
Net income$188 $24 
Operating Revenues
Operating revenues for 2023 were $1.5 billion, reflecting a $220 million, or 5.9%13.0%, decrease from 2022. Details of operating revenues were as follows:
20232022
(in millions)
Retail — prior year$935 
Estimated change resulting from —
Rates and pricing(11)
Sales growth11 
Weather(4)
Fuel and other cost recovery32 
Retail — current year$963 $935 
Wholesale revenues —
Non-affiliates272 252 
Affiliates200 460 
Total wholesale revenues472 712 
Other operating revenues39 47 
Total operating revenues$1,474 $1,694 
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Total retail revenues for 2023 increased $28 million, or 3.0%, compared to 2022 primarily due to higher recoverable fuel costs and an increase in customer usage, partially offset by lower contributions from commercial and industrial customers with variable demand-driven pricing and lower revenues associated with a tolling arrangement accounted for as a sales-type lease. See Notes 2 and 9 to the financial statements under "Mississippi Power" and "Lessor," respectively, for additional information.
See "Energy Sales" below for a discussion of changes in the volume of energy sold, including estimated changes related to sales and weather.
Electric rates for Mississippi Power include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not affect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside Mississippi Power's service territory. See Note 2 to the financial statements under "Mississippi Power – Fuel Cost Recovery" for additional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
20232022
(in millions)
Capacity and other$21 $
Energy251 249 
Total non-affiliated$272 $252 
Wholesale revenues from sales to non-affiliates increased $20 million, or 7.9%, compared to 2022. The increase was primarily due to capacity revenues associated with new capacity contracts in 2023.
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of Mississippi Power's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. In addition, Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023. Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above Mississippi Power's variable cost to produce the energy. See Note 2 under "Mississippi Power – Municipal and Rural Associations Tariff" for additional information.
Wholesale revenues from sales to affiliates decreased $260 million, or 56.5%, in 20172023 compared to 2022. The decrease was primarily due to a $293 million decrease associated with lower natural gas prices, partially offset by a $23 million increase in capacity revenues resulting from availability of generation reserves and an increase in pricing and a $10 million increase associated with higher KWH sales.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the IIC, as approved by the FERC. The energy portion of these transactions does not have a significant impact on earnings since this energy is generally sold at marginal cost.
In 2023, other operating revenues decreased $8 million, or 17.0%, as compared to 2022 primarily due to decreases of $5 million in unregulated sales associated with power delivery construction and maintenance projects and $3 million in open access transmission tariff revenues.
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Energy Sales
Changes in revenues are influenced heavily by the priorchange in the volume of energy sold from year to year. Dividends on preferredKWH sales for 2023 and preference stock decreased $9the percent change from 2022 were as follows:
2023
Total
KWHs
Total KWH
Percent Change
Weather-Adjusted Percent Change(*)
(in millions)
Residential2,092 (1.9)%0.7 %
Commercial2,815 7.0 7.1 
Industrial4,721 0.7 0.7 
Other28 (11.1)(11.1)
Total retail9,656 1.8 %2.5 %
Wholesale
Non-affiliated3,836 10.7 
Affiliated5,612 2.2 
Total wholesale9,448 5.5 
Total energy sales19,104 3.6 %
(*)Weather-adjusted KWH sales are estimated using statistical models of the historical relationship between temperatures and energy sales, and then removing the estimated effect of deviations from normal temperature conditions. Normal temperature conditions are defined as those experienced in Mississippi Power's service territory over a specified historical period. This metric is useful because it allows trends in historical operations to be evaluated apart from the influence of weather conditions. Management also considers this metric in developing long-term capital and financial plans.
Changes in retail energy sales are generally the result of changes in electricity usage by customers, weather, and the number of customers. Revenues attributable to changes in sales increased in 2023 when compared to 2022. Weather-adjusted residential KWH sales increased 0.7% due to an increase in customer usage. Weather-adjusted commercial KWH sales increased 7.1% primarily due to customer growth. Industrial KWH sales increased 0.7% primarily due to an increase in the non-manufacturing sector, partially offset by a decrease in the chemicals sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.
Fuel and Purchased Power Expenses
The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, Mississippi Power purchases a portion of its electricity needs from the wholesale market.
Details of Mississippi Power's generation and purchased power were as follows:
20232022
Total generation (in millions of KWHs)
18,789 18,303 
Total purchased power (in millions of KWHs)
524 617 
Sources of generation (percent) –
Gas92 90 
Coal8 10 
Cost of fuel, generated (in cents per net KWH) –
Gas2.68 4.34 
Coal5.46 4.13 
Average cost of fuel, generated (in cents per net KWH)
2.90 4.31 
Average cost of purchased power (in cents per net KWH)
4.27 6.91 
Fuel and purchased power expenses were $538 million in 2023, a decrease of $251 million, or 34.6%31.8%, in 2016 as compared to the prior year.2022. The decrease was primarily due to a $266 million decrease related to the redemption in May 2015average cost of certain seriesfuel and purchased power, partially offset by a $15 million net increase related to the volume of preferredKWHs generated and preference stock.purchased.
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Fuel and purchased power energy transactions do not have a significant impact on earnings since energy expenses are generally offset by energy revenues through Mississippi Power's fuel cost recovery clauses. See Note 62 to the financial statements under "Redeemable Preferred"Mississippi Power – Fuel Cost Recovery" and Preference Stock"Note 1 to the financial statements under "Fuel Costs" for additional information.
EffectsFuel expense decreased $230 million, or 30.8%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost of Inflationnatural gas per KWH generated and a 20.3% decrease in the volume of KWHs generated by coal, partially offset by a 32.2% increase in the average cost of coal per KWHs generated and a 5.4% increase in the volume of KWHs generated by natural gas.
Purchased power expense decreased $21 million, or 49.9%, in 2023 compared to 2022 primarily due to a 38.2% decrease in the average cost per KWH purchased primarily due to lower natural gas prices and a 15.1% decrease in the volume of KWHs purchased primarily due to the availability of lower cost generation in the Southern Company system.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $14 million, or 3.7%, in 2023 compared to 2022. The decrease was primarily due to decreases of $14 million in reliability reserve accruals, $7 million in generation expenses, and $6 million in unregulated power delivery construction and maintenance projects, partially offset by increases of $5 million in storm reserve accruals and $2 million in certain employee compensation and benefit expenses. See Note 2 to the financial statements under "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" for additional information.
Depreciation and Amortization
Depreciation and amortization increased $9 million, or 5.0%, in 2023 compared to 2022 primarily due to an increase in depreciation associated with additional plant in service.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized increased $15 million, or 26.8%, in 2023 compared to 2022. The increase was primarily due to increases of approximately $10 million related to higher interest rates and $5 million related to higher average outstanding borrowings. See FINANCIAL CONDITION AND LIQUIDITY – "Sources of Capital" and "Financing Activities" herein and Note 8 to the financial statements for additional information.
Income Taxes
Income taxes decreased $1 million, or 2.7%, in 2023 compared to 2022 primarily due to a decrease of $7 million associated with the flowback of certain excess deferred income taxes associated with new PEP rates that became effective in April 2023, largely offset by an increase of $6 million associated with higher pre-tax earnings. See Note 2 to the financial statements under "Mississippi Power – Performance Evaluation Plan" and Note 10 to the financial statements for additional information.
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Southern Power
Net income attributable to Southern Power for 2023 was $357 million, a $3 million increase from 2022. The increase was primarily due to higher HLBV income associated with tax equity partnerships, an arbitration award received for losses previously incurred, a gain on the sale of spare parts, and receipts of liquidated damages and insurance proceeds related to generation facility production and equipment, as well as changes in state apportionment methodology related to tax legislation enacted by the State of Tennessee. These increases were largely offset by lower revenues driven by lower market prices of energy.
A condensed statement of income follows:
2023
Increase
(Decrease)
from 2022
(in millions)
Operating revenues$2,189 $(1,180)
Fuel706 (908)
Purchased power116 (195)
Other operations and maintenance473 (9)
Depreciation and amortization504 (12)
Taxes other than income taxes51 2 
Loss on sales-type leases (1)
Gain on dispositions, net(20)(18)
Total operating expenses1,830 (1,141)
Operating income359 (39)
Interest expense, net of amounts capitalized129 (9)
Other income (expense), net12 5 
Income taxes (benefit)12 (8)
Net income230 (17)
Net loss attributable to noncontrolling interests(127)(20)
Net income attributable to Southern Power$357 $3 
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas facilities, and PPA energy revenues from Southern Power's generation facilities. To the extent Southern Power has capacity not contracted under a PPA, it may sell power into an accessible wholesale market, or, to the extent those generation assets are part of the FERC-approved IIC, it may sell power into the Southern Company is subjectpower pool.
Natural Gas Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to rate regulation thatoperating income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally basedsold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the recoveryenergy demand of historicalSouthern Power's customers and projected costs.their generation capacity, as well as the market prices of wholesale energy compared to the cost of Southern Power's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are generally accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
Southern Power's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have capacity revenue. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy generated from the respective facility and sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.
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See FUTURE EARNINGS POTENTIAL – "Southern Power's Power Sales Agreements" herein for additional information regarding Southern Power's PPAs.
Operating Revenues Details
Details of Southern Power's operating revenues were as follows:
20232022
(in millions)
PPA capacity revenues$471 $451 
PPA energy revenues1,227 2,121 
Total PPA revenues1,698 2,572 
Non-PPA revenues436 761 
Other revenues55 36 
Total operating revenues$2,189 $3,369 
Operating revenues for 2023 were $2.2 billion, a $1.2 billion, or 35.0% decrease from 2022. The effectschange in operating revenues was primarily due to the following:
PPA capacity revenuesincreased $20 million, or 4.4%, primarily due to an increase associated with a change in rates from new and existing natural gas PPAs.
PPA energy revenues decreased $894 million, or 42.1%, primarily due to a $904 million decrease in sales under natural gas PPAs resulting from a $726 million decrease in the price of inflation can createfuel and purchased power and a $178 million decrease in the volume of KWHs sold.
Non-PPA revenues decreased $325 million, or 42.7%, primarily due to a $650 million decrease in the market price of energy, partially offset by a $321 million increase in the volume of KWHs sold through short-term sales.
Other revenues increased $19 million, or 52.8%, primarily due to receipts of liquidated damages associated with generation facility production guarantees, an economic loss since the recovery of costs could be in dollars that have less purchasing power. Any adverse effect of inflation on the Company's results of operations has not been substantial in recent years.arbitration award received for losses previously incurred, and business interruption insurance proceeds for damaged generation equipment. See Note 3 to the financial statements under "Retail Regulatory"General Litigation Matters – Southern Power" for additional information.
Fuel and Purchased Power Expenses
Details of Southern Power's generation and purchased power were as follows:
Total
KWHs
Total KWH % ChangeTotal
KWHs
20232022
(in billions of KWHs)
Generation4948
Purchased power33
Total generation and purchased power522.0%51
Total generation and purchased power (excluding solar, wind, fuel cells, and tolling agreements)
336.5%31
Southern Power's PPAs for natural gas generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. Southern Power is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the Southern Company power pool for capacity owned directly by Southern Power.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the Southern Company power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by Southern Power, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
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Details of Southern Power's fuel and purchased power expenses were as follows:
20232022
(in millions)
Fuel$706 $1,614 
Purchased power116 311 
Total fuel and purchased power expenses$822 $1,925 
In 2023, total fuel and purchased power expenses decreased $1.1 billion, or 57.3%, compared to 2022. Fuel expensedecreased $908 million, or 56.3%, primarily due to a $1.0 billion decrease associated with the average cost of fuel. Purchased power expense decreased $195 million, or 62.7%, primarily due to a $206 million decrease associated with the average cost of purchased power.
Gain on Dispositions, Net
In 2023, gain on dispositions, net increased $18 million compared to 2022 primarily due to a $16 million gain on the sale of spare parts in 2023.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized decreased $9 million, or 6.5%, compared to 2022. The decrease was primarily due to lower average outstanding borrowings.
Income Taxes (Benefit)
In 2023, income taxes decreased $8 million, or 40.0%, compared to 2022. The decrease was primarily due to a change in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in the second quarter 2023. See Notes 1 and 10 to the financial statements under "Income Taxes" and "Effective Tax Rate, RSE"" respectively, for additional information.
Net Loss Attributable to Noncontrolling Interests
In 2023, net loss attributable to noncontrolling interests increased $20 million, or 18.7%, compared to 2022. The increased loss was primarily due to $25 million in higher HLBV loss allocations to wind tax equity partners and $5 million in lower income allocations to equity partners, partially offset by $10 million in lower HLBV loss allocations to battery energy storage partners.
Southern Company Gas
Southern Company Gas has various regulatory mechanisms, such as weather and revenue normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of its utility's respective service territory. Southern Company Gas also utilizes weather hedges to limit the negative income impacts in the event of warmer-than-normal weather in Illinois for gas distribution operations and in Illinois and Georgia for gas marketing services. Therefore, weather typically does not have a significant net income impact.
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Southern Company Gas' base operating expenses, excluding cost of natural gas and bad debt expense, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing Southern Company Gas' annual results. Thus, Southern Company Gas' operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
Percent Generated During
Heating Season
Operating RevenuesNet
Income
202367 %73 %
202267 %66 %
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Net Income
Net income attributable to Southern Company Gas in 2023 was $615 million, an increase of $43 million, or 7.5%, compared to 2022. Net income increased primarily as a result of an impairment charge in 2022 related to the sale of natural gas storage facilities. The increase in net income was partially offset by a decrease of $29 million in net income at gas distribution operations primarily as a result of reduced revenue due to lower volumes sold, regulatory disallowances at Nicor Gas, and higher depreciation related to continued investment in infrastructure replacement programs, partially offset by lower cost of gas, and a $9 million decrease in net income at gas pipeline investments primarily as a result of higher expenses at SNG.
A condensed income statement for Southern Company Gas follows:
2023Increase (Decrease) from 2022
(in millions)
Operating revenues$4,702 $(1,260)
Cost of natural gas1,644 (1,360)
Other operations and maintenance1,194 18 
Depreciation and amortization582 23 
Taxes other than income taxes262 (20)
Impairment charges (131)
Estimated loss on regulatory disallowance88 88 
Gain on dispositions, net(7)(3)
Total operating expenses3,763 (1,385)
Operating income939 125 
Earnings from equity method investments140 (8)
Interest expense, net of amounts capitalized310 47 
Other income (expense), net57 4 
Earnings before income taxes826 74 
Income taxes211 31 
Net Income$615 $43 
Operating Revenues
Operating revenues in 2023 were $4.7 billion, reflecting a $1.3 billion, or 21.1%, decrease compared to 2022. Details of operating revenues were as follows:
2023
(in millions)
Operating revenues – prior year$5,962
Estimated change resulting from –
Infrastructure replacement programs and base rate changes194
Gas costs and other cost recovery(1,323)
Gas marketing services(93)
Other(38)
Operating revenues – current year$4,702
Revenues from infrastructure replacement programs and base rate changes increased in 2023 primarily due to rate increases at the natural gas distribution utilities and continued investment in infrastructure replacement, partially offset by lower volumes sold and regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Revenues associated with gas costs and other cost recovery decreased in 2023 primarily due to lower natural gas cost recovery associated with lower natural gas prices, the timing of natural gas purchases, and the recovery of those costs from customers. The natural gas distribution utilities have weather or revenue normalization mechanisms that mitigate revenue fluctuations from
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customer consumption changes. Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information.
Revenues from gas marketing services decreased in 2023 primarily due to lower natural gas prices and the timing of unrealized hedge losses.
Customer Count
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas distribution operations' and gas marketing services' customers are primarily located in Georgia and Illinois.
The following table provides the number of customers served by Southern Company Gas at December 31, 2023 and 2022:
20232022
(in thousands, except market share %)
Gas distribution operations4,374 4,358 
Gas marketing services
Energy customers665 622 
Market share of energy customers in Georgia30.0 %29.3 %
Southern Company Gas anticipates customer growth and uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas – Natural Gas Cost Recovery" for additional information. Cost of natural gas at gas distribution operations represented 83.5% of the total cost of natural gas for 2023.
Gas marketing services customers are charged for actual and estimated natural gas consumed. Cost of natural gas includes the cost of fuel and associated transportation costs, lost and unaccounted for gas, and gains and losses associated with certain derivatives.
In 2023, cost of natural gas was $1.6 billion, a decrease of $1.4 billion, or 45.3%, compared to 2022, which reflects lower gas cost recovery in 2023 as a result of a 58.8% decrease in natural gas prices compared to 2022.
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Volumes of Natural Gas Sold
Southern Company Gas' natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas.
The following table details the volumes of natural gas sold during all periods presented:
2023 vs. 2022
20232022% Change
Gas distribution operations (mmBtu in millions)
Firm625 707 (11.6)%
Interruptible93 93  
Total718 800 (10.3)%
Gas marketing services (mmBtu in millions)
Firm:
Georgia33 35 (5.7)%
Other19 18 5.6 
Interruptible large commercial and industrial14 14  
Total66 67 (1.5)%
Other Operations and Maintenance Expenses
In 2023, other operations and maintenance expenses increased $18 million, or 1.5%, compared to 2022. The increase was primarily due to increases of $70 million in compensation and benefits and $20 million related to energy service contracts, partially offset by a decrease of $60 million in expenses passed through to customers primarily related to bad debt and energy efficiency programs at gas distribution operations. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Depreciation and Amortization
In 2023, depreciation and amortization increased $23 million, or 4.1%, compared to 2022. The increase was primarily due to continued infrastructure investments at the natural gas distribution utilities. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information.
Taxes Other Than Income Taxes
In 2023, taxes other than income taxes decreased $20 million, or 7.1%, compared to 2022. The decrease was primarily due to a $29 million decrease in revenue taxes, partially offset by increases in payroll and property taxes.
Impairment Charges
In 2022, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
Estimated Loss on Regulatory Disallowance
In 2023, Southern Company Gas recorded pre-tax charges related to the disallowance of certain capital investments at Nicor Gas, $88 million of which was recorded in estimated loss on regulatory disallowance. See Note 2 under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for additional information.
Interest Expense, Net of Amounts Capitalized
In 2023, interest expense, net of amounts capitalized increased $47 million, or 17.9%, compared to 2022. The increase reflects $43 million related to higher interest rates and $8 million related to higher average outstanding borrowings. See Note 8 to the financial statements for additional information.
Income Taxes
In 2023, income taxes increased $31 million, or 17.2%, compared to 2022. The increase was primarily due to $33 million of tax benefit in 2022 related to the impairment charges associated with the sale of two natural gas storage facilities and higher taxes
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related to increased earnings, partially offset by approximately $24 million related to the regulatory disallowances at Nicor Gas. See Notes 2 and 15 to the financial statements under "Southern Company Gas" and Note 10 to the financial statements for additional information.
Segment Information
20232022
Operating RevenuesOperating ExpensesNet Income (Loss)Operating RevenuesOperating ExpensesNet Income (Loss)
(in millions)(in millions)
Gas distribution operations$4,105 $3,301 $441 $5,267 $4,464 $470 
Gas pipeline investments32 10 98 32 11 107 
Gas marketing services548 418 91 638 505 94 
All other36 40 (15)55 190 (99)
Intercompany eliminations(19)(6) (30)(22)— 
Consolidated$4,702 $3,763 $615 $5,962 $5,148 $572 
Gas Distribution Operations
Gas distribution operations is the largest component of Southern Company Gas' business and is subject to regulation and oversight by regulatory agencies in each of the states it serves. These agencies approve natural gas rates designed to provide Southern Company Gas with the opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest expense, operations and maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, Southern Company Gas' second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. Southern Company Gas has various regulatory and other mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit its exposure to changes in customer consumption, including weather changes within typical ranges in its natural gas distribution utilities' service territories. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income decreased $29 million, or 6.2%, compared to 2022. Operating revenues decreased $1.2 billion primarily due to lower gas cost recovery and lower volumes sold, partially offset by rate increases and continued investment in infrastructure replacement. Gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas. Operating expenses decreased $1.2 billion primarily due to a $1.3 billion decrease in the cost of natural gas as a result of lower gas prices compared to 2022 and lower taxes other than income taxes, partially offset by $88 million related to the regulatory disallowances at Nicor Gas, higher depreciation resulting from additional assets placed in service, higher compensation and benefits expenses, and a $20 million increase related to energy service contracts. The decrease in operating expenses also includes costs passed through directly to customers, primarily related to bad debt expenses, energy efficiency programs, and revenue taxes. The decrease in net income also includes an increase of $46 million in interest expense, net of amounts capitalized primarily due to higher interest rates and higher average outstanding debt, partially offset by a $19 million decrease in income taxes primarily as a result of the tax benefit resulting from the regulatory disallowances at Nicor Gas. See Note 2 to the financial statements under "Southern Company Gas" for additional information.
Gas Pipeline Investments
Gas pipeline investments consists primarily of joint ventures in natural gas pipeline investments including SNG and Dalton Pipeline. In 2023, net income decreased $9 million compared to 2022. The decrease was primarily due to lower earnings at SNG resulting from higher expenses. See Note 7 to the financial statements under "Southern Company Gas" for additional information.
Gas Marketing Services
Gas marketing services provides energy-related products and services to natural gas markets and participants in customer choice programs that were approved in various states to increase competition. These programs allow customers to choose their natural gas supplier while the local distribution utility continues to provide distribution and transportation services. Gas marketing
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services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts.
In 2023, net income decreased $3 million, or 3.2%, compared to 2022. The decrease was due to a $90 million decrease in operating revenues primarily due to lower gas prices and the timing of unrealized hedge losses, largely offset by an $87 million decrease in operating expenses primarily related to a $106 million decrease in cost of gas, partially offset by higher compensation and benefits.
All Other
All other includes natural gas storage businesses, a renewable natural gas business, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the reportable segments and interest income (expense) associated with affiliate financing arrangements. All other included a natural gas storage facility in Texas through its sale in November 2022 and a natural gas storage facility in California through its sale in September 2023. See Note 15 to the financial statements under "Southern Company Gas" for additional information.
In 2023, net income increased $84 million compared to 2022. The increase was primarily due to a decrease in operating expenses primarily related to pre-tax impairment charges in 2022 totaling approximately $131 million ($99 million after tax) as a result of an agreement to sell two natural gas storage facilities, lower depreciation, lower cost of gas, and lower taxes other than income taxes, partially offset by a decrease in operating revenues of $19 million and an increase in income taxes. See Note 10 to the financial statements and Note 15 to the financial statements under "Southern Company Gas"for additional information.
FUTURE EARNINGS POTENTIAL
General
The Company operates as a vertically integrated utility providing electric service to retail and wholesale customers within its traditional service territory located in the State of Alabama and to wholesale customers in the Southeast. Prices for electric service provided by the Companytraditional electric operating companies and natural gas distribution service provided by the natural gas distribution utilities to retail customers are set by the Alabama PSCstate PSCs or other applicable state regulatory agencies under cost-based regulatory principles. Retail rates and earnings are reviewed through various regulatory mechanisms and/or processes and may be adjusted periodically within certain limitations. Effectively operating pursuant to these regulatory mechanisms and/or processes and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the traditional electric operating companies and natural gas distribution utilities for the foreseeable future. Prices for wholesale electric service,electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Retail rates and earnings are reviewed and may be adjusted periodically within certain limitations.Southern Power continues to focus on long-term PPAs. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 32 to the financial statements under "Retail Regulatory Matters" for additional information about regulatory matters.
TheEach Registrant's results of operations for the past three years are not necessarily indicative of its future earnings potential. The level of the Company'sRegistrants' future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Company'sRegistrants' primary businessbusinesses of providingselling electricity and/or distributing natural gas, as described further herein.
For the traditional electric service. Theseoperating companies, these factors include the Company's ability to maintain a constructive regulatory environmentenvironments that continues to allow for the timely recovery of prudently-incurred costs during a time of increasing costs, and limitedincluding those related to projected long-term demand growth, overstringent environmental standards, including CCR rules, safety, system reliability and resiliency, fuel, restoration following major storms, and capital expenditures, including constructing new electric generating plants and expanding and improving the next several years. Future earnings will be impacted bytransmission and distribution systems; continued customer growth. growth; and the trends of higher inflation and reduced electricity usage per customer, especially in residential and commercial markets. For Georgia Power, other major factors are completing construction and start-up of Plant Vogtle Unit 4 and meeting the related cost and schedule projections.
Earnings in the electricity business will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, both of which could contribute to a net reduction in customer usage.
Global and U.S. economic conditions continue to be affected by higher-than-expected inflation that arose from the COVID-19 pandemic and associated policy responses of governments and central banks. In response to elevated inflation levels, the U.S. Federal Reserve raised interest rates faster than any rate increase cycle in the last 40 years. The actions by the U.S. Federal Reserve have helped to slow the rate of inflation and curtail economic activity. Although target levels of inflation have yet to be achieved, the U.S. Federal Reserve has indicated its current intention to pause future rate increases and evaluate rate cuts in the near term. The shifting economic policy variables and weakening of historic relationships among economic activity, prices, and employment have increased the uncertainty of future levels of economic activity, which will directly impact future energy demand and operating costs. Weakening economic activity increases the risk of slowing or declining energy sales. See RESULTS OF OPERATIONS herein for information on energy sales in the Southern Company system's service territory during 2023.
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The level of future earnings for Southern Power's competitive wholesale electric business depends on numerous factors including the parameters of the wholesale market and the efficient operation of its wholesale generating assets; Southern Power's ability to execute its growth strategy through the development, construction, or acquisition of renewable facilities and other energy projects while containing costs; regulatory matters; customer creditworthiness; total electric generating capacity available in Southern Power's market areas; Southern Power's ability to successfully remarket capacity as current contracts expire; renewable portfolio standards; continued availability of federal and state ITCs and PTCs, which could be impacted by future tax legislation; transmission constraints; cost of generation from units within the Southern Company power pool; and operational limitations. See "Income Tax Matters" herein for information regarding the IRA's expansion of the availability of federal ITCs and PTCs. Also see Notes 10 and 15 to the financial statements for additional information.
The level of future earnings for Southern Company Gas' primary business of distributing natural gas and its complementary businesses in the gas pipeline investments and gas marketing services sectors depends on numerous factors. These factors include the natural gas distribution utilities' ability to maintain constructive regulatory environments that allow for the timely recovery of prudently-incurred costs, including those related to projected long-term demand growth, safety, system reliability and resiliency, natural gas, and capital expenditures, including expanding and improving the natural gas distribution systems; the completion and subsequent operation of ongoing infrastructure and other construction projects; customer creditworthiness; and certain policies to limit the use of natural gas, such as the potential in Illinois and across certain other parts of the U.S. for state or municipal bans on the use of natural gas or policies designed to promote electrification. The volatility of natural gas prices has an impact on Southern Company Gas' customer rates, its long-term competitive position against other energy sources, and the ability of Southern Company Gas' gas marketing services business to capture value from locational and seasonal spreads. Additionally, changes in commodity prices, primarily driven by tight gas supplies, geopolitical events, and diminished gas production, subject a portion of Southern Company Gas' operations to earnings variability and may result in higher natural gas prices. Additional economic factors may contribute to this environment. The demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis. Alternatively, a significant drop in oil and natural gas prices could lead to a consolidation of natural gas producers or reduced levels of natural gas production.
Earnings for both the electricity and natural gas businesses are subject to a variety of other factors. These factors include weather, competition,weather; competition; developing new and maintaining existing energy contracts and associated load requirements with other utilities,wholesale customers; customer energy conservation practiced by customers,practices; the use of alternative energy sources by customers, the pricecustomers; government incentives to reduce overall energy usage; fuel, labor, and material prices in an environment of electricity,heightened inflation and material and labor supply chain disruptions; and the price elasticity of demand,demand. Demand for electricity and the rate of economic growth or declinenatural gas in the Company'sRegistrants' service territory. Demand for electricityterritories is primarily driven by the pace of economic growth or decline that may be affected by changes in regional and global economic conditions, which may impact future earnings.
On December 22, 2017, Tax Reform Legislation was signed into lawMississippi Power provides service under long-term contracts with rural electric cooperative associations and became effective on January 1, 2018,a municipality located in southeastern Mississippi under requirements cost-based electric tariffs which amongare subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023.
As part of its ongoing effort to adapt to changing market conditions, Southern Company continues to evaluate and consider a wide array of potential business strategies. These strategies may include business combinations, partnerships, and acquisitions involving other things, reducesutility or non-utility businesses or properties, disposition of, or the federal corporate income tax rate to 21%sale of interests in, certain assets or businesses, internal restructuring, or some combination thereof. Furthermore, Southern Company may engage in new business ventures that arise from competitive and regulatory changes ratesin the utility industry. Pursuit of depreciation andany of the above strategies, or any combination thereof, may significantly affect the business interest deduction.operations, risks, and financial condition of Southern Company. In addition, Southern Power and Southern Company Gas regularly consider and evaluate joint development arrangements as well as acquisitions and dispositions of businesses and assets as part of their business strategies. See "Income Tax MattersFederal Tax Reform Legislation" and FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Notes 3 and 5Note 15 to the financial statements under "Retail Regulatory Matters – Rate RSE" and "Current and Deferred Income Taxes," respectively, for additional information.
Environmental Matters
The Company'sSouthern Company system's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, avian and other wildlife and habitat protection, ofand other natural resources. The Southern Company system maintains a comprehensive environmental compliance strategyand GHG strategies to assess both current and upcoming requirements and compliance costs associated with these environmental laws and regulations. The costs, including capital expendituresNew or revised environmental laws and regulations could further affect many areas of operations and maintenancefor the Subsidiary Registrants. The costs required to comply with environmental laws and regulations and to achieve stated goals, including capital expenditures, operations and maintenance costs, and costs reflected in ARO liabilities, may impact future electric generating unit retirement and replacement decisions (which are generally subject to approval from the traditional electric operating companies' respective state PSCs), results of operations, cash

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

flows, andand/or financial condition. ComplianceRelated costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, and adding or changing fuel sources for certain existing
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units, as well as related upgrades to the Southern Company system's transmission system.and distribution (electric and natural gas) systems. A major portion of these compliance costs areis expected to be recovered through retail and wholesale rates, including existing ratemaking and billing provisions. The ultimate impact of the environmental laws and regulations and the GHG goals discussed belowherein cannot be determined at this time and will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, andfuel prices, the outcome of pending and/or future legal challenges.challenges and regulatory matters, and the ability to continue recovering the related costs, through rates for the traditional electric operating companies and the natural gas distribution utilities and/or through long-term wholesale agreements for the traditional electric operating companies and Southern Power.
New or revisedAlabama Power and Mississippi Power recover environmental compliance costs through separate mechanisms, Rate CNP Compliance and the ECO Plan, respectively. Georgia Power's base rates include an ECCR tariff that allows for the recovery of environmental compliance costs. The natural gas distribution utilities of Southern Company Gas generally recover environmental remediation expenditures through rate mechanisms approved by their applicable state regulatory agencies. See Notes 2 and 3 to the financial statements for additional information.
Southern Power's PPAs generally contain provisions that permit charging the counterparty for some of the new costs incurred as a result of changes in environmental laws and regulations could affect many areasregulations. Since Southern Power's units are generally newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the Company's operations.potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and/or operating any type of existing or future facility. The impact of any such changeslaws, regulations, and other considerations on Southern Power and subsequent recovery through PPA provisions cannot be determined at this time. Environmental compliance costs could affect earnings if such costs cannot continue to be fully recovered in rates on a timely basis. Environmental compliance costs are recovered through Rate CNP Compliance. See Note 3 to the financial statements under "Retail Regulatory Matters – Rate CNP Compliance" for additional information.
Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity and natural gas, which could negatively affect results of operations, cash flows, andand/or financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affect their demand for electricity.electricity and natural gas.
Through 2017, the Company has invested approximately $4.7 billion in environmental capital retrofit projects to comply with environmental requirements, with annual totals of approximately $491 million, $260 million, and $349 million for 2017, 2016, and 2015, respectively. Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, estimated capital expenditures through 2028 based on the Company's current environmental compliance strategy estimates capital expenditures of $1.4 billion from 2018 through 2022, with annual totals of approximately $581 million in 2018, $110 million in 2019, $163 million in 2020, $258 million in 2021,for the Southern Company system and $268 million in 2022. the traditional electric operating companies are as follows:
20242025202620272028Total
(in millions)
Southern Company$150 $141 $112 $92 $30 $525 
Alabama Power45 47 40 35 19 186 
Georgia Power92 80 60 32 10 274 
Mississippi Power13 13 12 26 65 
These estimates do not include any potential compliance costs associated with thepotential regulation of CO2GHG emissions from fossil fuel-fired electric generating units.or the proposed ELG Supplemental Rule. See "Global Climate Issues""Environmental Laws and Regulations– Greenhouse Gases" and "– Water Quality" herein for additional information. The Southern Company system also anticipates substantial expenditures associated with ash pond closure and ground watergroundwater monitoring under the Disposal of Coal Combustion Residuals from Electric Utilities rule (CCR Rule),CCR Rule and related state rules, which are reflected in the Company'sapplicable Registrants' ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations""Cash Requirements" herein and Note 16 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
Environmental Laws and Regulations
Air Quality
TheSince 1990, the Southern Company system reduced SO2 and NOX air emissions by 99% and 92%, respectively, through 2022. Since 2005, the Southern Company system reduced mercury air emissions by 97% through 2022.
On February 13, 2023, the EPA has setpublished a final rule disapproving 19 state implementation plans (SIPs), including the States of Alabama and Mississippi, under the interstate transport (good neighbor) provisions of the Clean Air Act for the 2015 Ozone National Ambient Air Quality Standards (NAAQS) for six air pollutants (carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter,. On March 14, 2023 and SO2), which it reviewsMarch 15, 2023, the State of Mississippi and revises periodically. Revisions to these standards can require additional emission controls, improvements in control efficiency, or fuel changes which can result in increased compliance and operational costs. NAAQS requirements can also adversely affectMississippi Power, respectively, challenged the siting of new facilities. In 2015, the EPA published a more stringent eight-hour ozone NAAQS. The EPA plans to complete designations for this rule by no later than April 30, 2018. No areas within the Company's service territory have been or are anticipated to be designated nonattainment under the 2015 ozone NAAQS. In 2010, the EPA revised the NAAQS for SO2, establishing a new one-hour standard, and is completing designations in multiple phases. The EPA has issued several rounds of area designations and no areas in the vicinity of Company-owned SO2 sources have been designated nonattainment under the 2010 one-hour SO2 NAAQS. However, final eight-hour ozone and SO2 one-hour designations for certain areas are still pending and, if other areas are designated as nonattainment in the future, increased compliance costs could result.
In 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) and its NOX annual, NOX seasonal, and SO2 annual programs. CSAPR is an emissions trading program that addresses the impactsEPA's disapproval of the interstate transport of SO2 and NOX emissions from fossil fuel-fired power plants locatedMississippi SIP in upwind states in the eastern half of the U.S. on air quality in downwind states. The Company has fossil fuel-fired generation subject to these requirements. In October 2016, the EPA published a final rule that revised the CSAPR seasonal NOX program, establishing more stringent NOX emissions budgets in Alabama. Increases in either future fossil fuel-fired generation or the cost of CSAPR allowances could have a negative financial impact on results of operations for the Company.
The EPA finalized regional haze regulations in 2005 and 2017. These regulations require states, tribal governments, and various federal agencies to develop and implement plans to reduce pollutants that impair visibility and demonstrate reasonable progress toward the goal of restoring natural visibility conditions in certain areas, including national parks and wilderness areas. States must submit a revised state implementation plan (SIP) to the EPA by July 31, 2021, demonstrating reasonable progress towards achieving visibility improvement goals. State implementation of reasonable progress could require further reductions in SO2 or NOX emissions, which could result in increased compliance costs.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

In 2015, the EPA published a final rule requiring certain states (including Alabama) to revise or remove the provisions of their SIPs regulating excess emissions at industrial facilities, including electric generating facilities, during periods of startup, shut-down, or malfunction (SSM). The state excess emission rules provide necessary operational flexibility to affected units during periods of SSM and, if removed, could affect unit availability and result in increased operations and maintenance costs for the Company.
Water Quality
In 2014, the EPA finalized requirements under Section 316(b) of the Clean Water Act (CWA) to regulate cooling water intake structures at existing power plants and manufacturing facilities in order to minimize their effects on fish and other aquatic life. The regulation requires plant-specific studies to determine applicable measures to protect organisms that either get caught on the intake screens (impingement) or are drawn into the cooling system (entrainment). The ultimate impact of this rule will depend on the outcome of these plant-specific studies and any additional protective measures required to be incorporated into each plant's National Pollutant Discharge Elimination System (NPDES) permit based on site-specific factors.
In 2015, the EPA finalized the steam electric effluent limitations guidelines (ELG) rule that set national standards for wastewater discharges from steam electric generating units. The rule prohibits effluent discharges of certain wastestreams and imposes stringent arsenic, mercury, selenium, and nitrate/nitrite limits on scrubber wastewater discharges. The revised technology-based limits and compliance dates may require extensive modifications to existing ash and wastewater management systems or the installation and operation of new ash and wastewater management systems. Compliance with the ELG rule is expected to require capital expenditures and increased operational costs primarily affecting the Company's coal-fired electric generation. Compliance applicability dates range from November 1, 2018 to December 31, 2023 with state environmental agencies incorporating specific applicability dates in the NPDES permitting process based on information provided for each waste stream. The EPA has committed to a new rulemaking that could potentially revise the limitations and applicability dates of the ELG rule. The EPA expects to finalize this rulemaking in 2020. The Company continues to monitor the ELG rule and anticipates that approximately 1,000 MWs of the Company's generation will not be available after the compliance date. The ultimate impact of this rule will depend on any new rule-making that revises the limitation and applicable dates. The Company does not anticipate that the unavailability of any units as a result of the ELG rule will have a material impact on the Company's operations or financial condition.
In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) jointly published a final rule that revised the regulatory definition of waters of the United States (WOTUS) for all CWA programs. The rule significantly expanded the scope of federal jurisdiction over waterbodies (such as rivers, streams, and canals), which could impact new generation projects and permitting and reporting requirements associated with the installation, expansion, and maintenance of transmission and distribution projects. On July 27, 2017, the EPA and the Corps proposed to rescind the 2015 WOTUS rule. The WOTUS rule has been stayed by the U.S. Court of Appeals for the Sixth Circuit since late 2015, but on January 22, 2018,
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Fifth Circuit. On June 8, 2023, the U.S. Supreme Court determined thatof Appeals for the Fifth Circuit stayed the EPA's disapproval of the Mississippi SIP, pending appeal. On April 13, 2023 and April 14, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the EPA's disapproval of the Alabama SIP in the U.S. Court of Appeals for the Eleventh Circuit. On August 17, 2023, the U.S. Court of Appeals for the Eleventh Circuit stayed the EPA's disapproval of the Alabama SIP, pending appeal.
On June 5, 2023, the EPA published the 2015 Ozone NAAQS Good Neighbor federal district courtsimplementation plan (FIP), which requires reductions in NOX emissions from sources in 23 states, including Alabama and Mississippi, to assure those states satisfy their Clean Air Act good neighbor obligations for the 2015 Ozone NAAQS. Georgia and North Carolina have jurisdiction overapproved interstate transport SIPs addressing the pending challenges2015 Ozone NAAQS and are not subject to thethis rule. On February 6, 2018,June 16, 2023 and June 27, 2023, the State of Mississippi and Mississippi Power, respectively, challenged the FIP for Mississippi in the U.S. Court of Appeals for the Fifth Circuit. On August 4, 2023, the State of Alabama, Alabama Power, and PowerSouth Energy Cooperative challenged the FIP for Alabama in the U.S. Court of Appeals for the Eleventh Circuit. Both cases are being held in abeyance pending resolution of the Mississippi SIP disapproval and Alabama SIP disapproval cases, respectively.
In July and September 2023, the EPA published an Interim Final Rule and an updated Interim Final Rule that stays the Corps published a final rule delaying implementation of the FIPs for states with judicially stayed SIP disapprovals, including Mississippi and Alabama, respectively. The Interim Final Rule revises the existing regulations to maintain currently applicable trading programs for those states.
The ultimate impact of the rule and associated legal matters cannot be determined at this time; however, implementation of the FIPs will likely result in increased compliance costs for the traditional electric operating companies.
Water Quality
In 2020, the EPA published the final steam electric ELG reconsideration rule (ELG Reconsideration Rule), a reconsideration of the 2015 WOTUSELG rule's limits on bottom ash transport water and flue gas desulfurization wastewater that extended the latest applicability date for both discharges to December 31, 2025. The ELG Reconsideration Rule also updated the voluntary incentive program and provided new subcategories for low utilization electric generating units and electric generating units that will permanently cease coal combustion by 2028. On March 29, 2023, the EPA published a proposed ELG Supplemental Rule revising certain effluent limits of the 2020 and 2015 ELG rules. The proposal imposes more stringent requirements for flue gas desulfurization wastewater, bottom ash transport water, and combustion residual leachate to be met no later than December 31, 2029. The EPA is also proposing that a limited number of facilities already achieving compliance with the 2020 ELG Reconsideration Rule be allowed to elect retirement or repowering by December 31, 2032 as opposed to meeting the new more stringent requirements. The proposal maintains the 2020 ELG Reconsideration Rule's permanent cessation of coal combustion subcategory allowing units to continue to operate until the end of 2028 without having to install additional technologies. The proposal also maintains the Voluntary Incentive Program (VIP) subcategory, which allows units to comply with VIP limits by December 31, 2028. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
As required by the ELG Reconsideration Rule, in 2021, Alabama Power and Georgia Power each submitted initial notices of planned participation (NOPP) for applicable units seeking to 2020.qualify for these cessation of coal combustion or VIP subcategories that require compliance by December 31, 2028.
Alabama Power submitted its NOPP to the Alabama Department of Environmental Management (ADEM) indicating plans to retire Plant Barry Unit 5 (700 MWs) and to cease using coal and begin operating solely on natural gas at Plant Barry Unit 4 (350 MWs) and Plant Gaston Unit 5 (880 MWs). Alabama Power, as agent for SEGCO, indicated plans to retire Plant Gaston Units 1 through 4 (1,000 MWs). However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. The NOPP submittals are subject to the review of the ADEM. Plant Barry Unit 4 ceased using coal and began to operate solely on natural gas in December 2022. See Notes 2 and 7 to the financial statements under "Georgia Power – Integrated Resource Plans" and "SEGCO," respectively, for additional information.
The remaining assets for which Alabama Power has indicated retirement, due to early closure or repowering of the unit to natural gas, have net book values totaling approximately $1.2 billion (excluding capitalized asset retirement costs which are recovered through Rate CNP Compliance) at December 31, 2023. Based on an Alabama PSC order, Alabama Power is authorized to establish a regulatory asset to record the unrecovered investment costs, including the plant asset balance and the site removal and closure costs, associated with unit retirements caused by environmental regulations (Environmental Accounting Order). Under the Environmental Accounting Order, the regulatory asset would be amortized and recovered over an affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance. See Note 2 to the financial statements under "Alabama Power – Rate CNP Compliance" and " – Environmental Accounting Order" for additional information.
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Georgia Power submitted its NOPP to the Georgia Environmental Protection Division (EPD) indicating plans to retire Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership), which occurred in August 2022, Plant Bowen Units 1 and 2 (1,400 MWs), and Plant Scherer Unit 3 (614 MWs based on 75% ownership) on or before the compliance date of December 31, 2028. Georgia Power also submitted a NOPP indicating plans to pursue compliance with the ELG Reconsideration Rule for Plant Scherer Units 1 and 2 (137 MWs based on 8.4% ownership) through the voluntary incentive program by no later than December 31, 2028. Georgia Power intends to comply with the ELG Rules for Plant Bowen Units 3 and 4 through the generally applicable requirements by December 31, 2025; therefore, no NOPP submission was required for these units. The NOPP submittals and generally applicable requirements are subject to the review of the Georgia EPD and decisions related to retirement or continued operation of units are subject to Georgia PSC approval. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the management and disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (CCR units)(ash ponds) at active electric generating power plants. The CCR Rule requires CCR unitslandfills and ash ponds to be evaluated against a set of performance criteria and potentially closed if minimumcertain criteria are not met. Closure of existing CCR units could requirelandfills and ash ponds requires installation of equipment and infrastructure to manage CCR in accordance with the CCR Rule. In addition to the federal CCR Rule, the States of Alabama and Georgia finalized state regulations regarding the management and disposal of CCR within their respective states. In 2019, the State of Georgia received partial approval from the EPA for its state CCR permitting program, which has broader applicability than the federal rule. The State of Mississippi has not developed a state CCR permit program.
On August 14, 2023, the EPA published a proposal to deny the ADEM's CCR permit program application. Alabama Power's permits to close its CCR facilities remain valid under state law. In the absence of an EPA-approved state permit program, CCR facilities in Alabama will remain subject to both the federal and state CCR rules.
The Holistic Approach to Closure: Part A rule, finalized in 2020, revised the deadline to stop sending CCR and non-CCR wastes to unlined surface impoundments to April 11, 2021 and established a process for the EPA to approve extensions to the deadline. The traditional electric operating companies stopped sending CCR and non-CCR wastes to their unlined impoundments prior to April 11, 2021 and, therefore, did not submit requests for extensions. Beginning in January 2022, the EPA issued numerous Part A determinations that state its current positions on a variety of CCR Rule compliance requirements, such as criteria for groundwater corrective action and CCR unit closure. The traditional electric operating companies are working with state regulatory agencies to determine whether the EPA's current positions may impact closure and groundwater monitoring plans.
In April 2022, the Utilities Solid Waste Activities Group and a group of generating facility operators filed petitions for review in the U.S. Court of Appeals for the D.C. Circuit challenging whether the EPA's January 2022 actions establish new legislative rules that should have gone through notice-and-comment rulemaking. A decision by the court is expected in 2024. The ultimate impacts of the EPA's current positions are subject to the outcome of the pending litigation and any potential future rulemaking and cannot be determined at this time.
On May 18, 2023, the EPA published a proposed rule to establish two new categories of federally regulated CCR, legacy surface impoundments and CCR management units (CCRMUs). The proposal establishes accelerated compliance deadlines for legacy surface impoundments to meet regulatory requirements, including a requirement to initiate closure within 12 months after the effective date of the final rule. The EPA has announced plansis also proposing a definition for CCRMUs. The EPA's proposal would also require facility evaluations to reconsider certain portionsbe completed at both active facilities and inactive facilities with one or more legacy surface impoundment to determine the presence or absence of CCRMUs. CCRMUs must comply with the CCR Rule by no later than December 2019,Rule's provisions for groundwater monitoring, corrective action, closure, and post-closure activities. On November 14, 2023, the EPA published a Notice of Data Availability supplementing the proposed rule, which sought comment on new data and a supplemental risk assessment that could be used to support final rulemaking. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in changes to deadlines and corrective action requirements.
The EPA's reconsideration of the CCR Rule is due in part to a legislative development that impacts the potential oversight role of state agencies. Under the Water Infrastructure Improvements for the Nation Act, which became law in 2016, states are allowed to establish permit programs for implementing the CCR Rule.significant compliance costs.
Based on cost estimatesrequirements for closure in place and monitoring of landfills and ash ponds pursuant to the CCR Rule and applicable state rules, the Company recorded AROstraditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to closure methodologies, schedules, and/or costs becomes available. Some of these updates have been, and future updates may be, material. Additionally, the closure designs and plans in 2015. As further analysis is performedthe States of Alabama and closure detailsGeorgia are developed,subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company and the Company will continue to periodically update these cost estimates as necessary.traditional electric operating companies could be materially impacted. See FINANCIAL CONDITION AND LIQUIDITY – "Capital"Cash Requirements," Notes 2 and Contractual Obligations"3 to the financial statements under "Georgia Power – Rate Plans" and "General Litigation Matters – Alabama Power," respectively, and Note 6 to the financial statements for additional information.
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Greenhouse Gases
On May 23, 2023, the EPA published proposed GHG standards and state plan guidelines for fossil fuel-fired power plants, which would require GHG limits for subcategories of both new and existing units based on technologies such as carbon capture and sequestration, low-GHG hydrogen co-firing, and natural gas co-firing. The proposed standards for new combustion turbines include subcategories for different operational uses including peaking, intermediate, and base load. Compliance with new source standards, once finalized, begins when the unit comes online. The proposed state plan guidelines for existing units include subcategories based on unit type, retirement date, size, and capacity factor. The EPA is proposing a 24-month state plan submission deadline for the existing unit implementation and may allow states to implement some limited form of trading and averaging for the state plans. Existing source compliance is proposed to begin as early as January 1, 2030, depending on the unit type and subcategory. The EPA also proposes to simultaneously repeal the Affordable Clean Energy rule. On November 17, 2023, the EPA published a final rule updating the regulations governing the processes and timelines for state and federal plans to implement existing source GHG performance standards. While this rule establishes the general requirements and timelines for states to follow in implementing the EPA's emissions guidelines, the pending final rule for GHG emissions from fossil fuel-fired power plants is expected to include schedules and other implementation requirements that will supersede these general provisions. On November 20, 2023, the EPA published a Supplemental Notice of Proposed Rulemaking for the pending rules for fossil fuel-fired power plants requesting additional input on how the EPA should address reliability concerns in the final rules. A final rule is anticipated in 2024. The ultimate impact of this proposal cannot be determined at this time; however, it may result in significant compliance costs.
In 2021, the United States officially rejoined the Paris Agreement. The Paris Agreement establishes a non-binding universal framework for addressing GHG emissions based on nationally determined emissions reduction contributions and sets in place a process for tracking progress towards the goals every five years. In 2021, President Biden announced a new target for the United States to achieve a 50% to 52% reduction in economy-wide GHG emissions from 2005 levels by 2030. The target was accepted by the United Nations as the United States' nationally determined emissions reduction contribution under the Paris Agreement.
Additional GHG policies, including legislation, may emerge in the future requiring the United States to accelerate its transition to a lower GHG emitting economy; however, associated impacts are currently unknown. The Southern Company system has transitioned from an electric generating mix of 70% coal and 15% natural gas in 2007 to a mix of 17% coal and 54% natural gas in 2023. This transition has been supported in part by the Southern Company system retiring over 6,700 MWs of coal-fired generating capacity since 2010 and converting 3,700 MWs of generating capacity from coal to natural gas since 2015. In addition, the Southern Company system's capacity mix consists of over 11,600 MWs of renewable and storage facilities through ownership and long-term PPAs. See "Environmental Laws and Regulations – Water Quality" hereinfor information on plans to retire or convert to natural gas additional coal-fired generating capacity. In addition, Southern Company Gas has replaced over 6,000 miles of pipe material that was more prone to fugitive emissions (unprotected steel and cast-iron pipe), resulting in mitigation of more than 3.3 million metric tons of CO2 equivalents from its natural gas distribution system since 1998.
The following table provides the Registrants' 2022 and preliminary 2023 Scope 1 GHG emissions based on equity share of facilities:
2022Preliminary 2023
(in million metric tons of CO2 equivalent)
Southern Company(*)
8580
Alabama Power(*)
3528
Georgia Power2324
Mississippi Power99
Southern Power1313
Southern Company Gas(*)
22
(*)Includes GHG emissions attributable to disposed assets through the date of the applicable disposition and to acquired assets beginning with the date of the applicable acquisition. See Note 15 to the financial statements for additional information.
Southern Company system management has established an intermediate goal of a 50% reduction in GHG emissions from 2007 levels by 2030 and a long-term goal of net zero GHG emissions by 2050. Based on the preliminary 2023 emissions, the Southern Company system has achieved an estimated GHG emission reduction of 49% since 2007. GHG emissions decreased in 2023 when compared to 2022 as coal generation was displaced by lower carbon generation, including from Plant Vogtle Unit 3, as discussed further under RESULTS OF OPERATIONS – "Southern Company – Electricity Business" herein. Southern Company system management expects to achieve GHG reductions of greater than 50% as early as 2025, five years earlier than the established interim goal, and remain close to 50% through the late 2020s, followed thereafter by continued reductions. While none
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of Southern Company's subsidiaries are currently subject to renewable portfolio standards or similar requirements, management of the traditional electric operating companies is working with applicable regulators through their IRP processes to continue the generating fleet transition in a manner responsible to customers, communities, employees, and other stakeholders. Achievement of these goals is dependent on many factors, including natural gas prices and the pace and extent of development and deployment of low- to no-GHG energy technologies and negative carbon concepts. Southern Company system management plans to continue to pursue a diverse portfolio including low-carbon and carbon-free resources and energy efficiency resources; continue to transition the Southern Company system's generating fleet and make the necessary related investments in transmission and distribution systems; implement initiatives to reduce natural gas distribution operational emissions; continue its research and development with a particular focus on technologies that lower GHG emissions, including methods of removing carbon from the atmosphere; and constructively engage with policymakers, regulators, investors, customers, and other stakeholders to support outcomes leading to a net zero future.
Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and Southern Company Gas conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in their financial statements. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia (which represent substantially all of Southern Company Gas' accrued remediation costs) have all received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies. The traditional electric operating companies and Southern Company Gas may be liable for some or all required cleanup costs for additional sites that may require environmental remediation. See Note 3 to the financial statements under "Environmental Remediation" for additional information.
Regulatory Matters
See OVERVIEW – "Recent Developments" herein and Note 2 to the financial statements for a discussion of regulatory matters related to Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas, including items that could impact the applicable Registrants' future earnings, cash flows, and/or financial condition.
Alabama Power
On July 14, 2023, Alabama Power issued a request for proposals of between 100 MWs and 1,200 MWs of capacity beginning no later than December 1, 2028, with consideration for commencement as early as 2025. Any purchases will depend upon the cost competitiveness of the respective offers, as well as other options available to Alabama Power, and would ultimately require approval by the Alabama PSC. The ultimate outcome of this matter cannot be determined at this time.
Construction Programs
The Subsidiary Registrants are engaged in continuous construction programs to accommodate existing and estimated future loads on their respective systems. The Southern Company system strategy continues to include developing and constructing new electric generating facilities, expanding and improving the electric transmission and electric and natural gas distribution systems, and undertaking projects to comply with environmental laws and regulations.
For the traditional electric operating companies, major generation construction projects are subject to state PSC approval in order to be included in retail rates. The largest construction project currently underway in the Southern Company system is Plant Vogtle Unit 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information. Also see Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for information regarding Georgia Power's request with the Georgia PSC to develop, own, and operate three simple cycle combustion turbines at Plant Yates.
See Note 15 to the financial statements under "Southern Power" for information relating to Southern Power's construction of renewable energy facilities.
Southern Company Gas is engaged in various infrastructure improvement programs designed to update or expand the natural gas distribution systems of the natural gas distribution utilities to improve reliability and resiliency, reduce emissions, and meet operational flexibility and growth. The natural gas distribution utilities recover their investment and a return associated with these infrastructure programs through their regulated rates. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects" for additional information on Southern Company Gas' construction program.
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See FINANCIAL CONDITION AND LIQUIDITY – "Cash Requirements" herein for additional information regarding the Registrants' capital requirements for their construction programs, including estimated totals for each of the next five years.
Southern Power's Power Sales Agreements
General
Southern Power has PPAs with some of the traditional electric operating companies, other investor-owned utilities, IPPs, municipalities, and other load-serving entities, as well as commercial and industrial customers. The PPAs are expected to provide Southern Power with a stable source of revenue during their respective terms.
Many of Southern Power's PPAs have provisions that require Southern Power or the counterparty to post collateral or an acceptable substitute guarantee if (i) S&P or Moody's downgrades the credit ratings of the respective company to an unacceptable credit rating, (ii) the counterparty is not rated, or (iii) the counterparty fails to maintain a minimum coverage ratio. See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein for additional information.
Southern Power works to maintain and expand its share of the wholesale market. During 2023, Southern Power continued to be successful in remarketing up to 438 MWs of annual natural gas generation capacity to load-serving entities through several PPAs extending over the next 16 years. Market demand is being driven by load-serving entities replacing expired purchase contracts and/or retired generation, as well as planning for future growth.
Natural Gas
Southern Power's electricity sales from natural gas facilities are primarily through long-term PPAs that consist of two types of agreements. The first type, referred to as a unit or block sale, is a customer purchase from a dedicated generating unit where all or a portion of the generation from that unit is reserved for that customer. Southern Power typically has the ability to serve the unit or block sale customer from an alternate resource. The second type, referred to as requirements service, provides that Southern Power serve the customer's capacity and energy requirements from a combination of the customer's own generating units and from Southern Power resources not dedicated to serve unit or block sales. Southern Power has rights to purchase power provided by the requirements customers' resources when economically viable.
As a general matter, substantially all of the PPAs provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing Southern Power for substantially all of the cost of fuel or purchased power relating to the energy delivered under such PPAs. To the extent a particular generating facility does not meet the operational requirements contemplated in the PPAs, Southern Power may be responsible for excess fuel costs. With respect to fuel transportation risk, most of Southern Power's PPAs provide that the counterparties are responsible for the availability of fuel transportation to the particular generating facility.
Capacity charges that form part of the PPA payments are designed to recover fixed and variable operation and maintenance costs based on dollars-per-kilowatt year. In general, to reduce Southern Power's exposure to certain operation and maintenance costs, Southern Power has LTSAs. See Note 1 to the financial statements under "Long-Term Service Agreements" for additional information.
Solar and Wind
Southern Power's electricity sales from solar and wind generating facilities are also primarily through long-term PPAs; however, these PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or provide Southern Power a certain fixed price for the electricity sold to the grid. As a result, Southern Power's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Generally, under the renewable generation PPAs, the purchasing party retains the right to keep or resell the associated renewable energy credits.
Income Tax Matters
Consolidated Income Taxes
The impact of certain tax events at Southern Company and/or its other subsidiaries can, and does, affect each Registrant's ability to utilize certain tax credits. See "Tax Credits" and ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Accounting for Income Taxes" herein and Note 10 to the financial statements for additional information.
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Tax Credits
Southern Company has received ITCs and PTCs in connection with investments in solar, wind, fuel cell, advanced nuclear, and battery energy storage facilities (co-located with existing solar facilities) primarily at Southern Power and Georgia Power.
Southern Power's ITCs relate to its investment in new solar facilities and battery energy storage facilities (co-located with existing solar facilities) that are acquired or constructed and its PTCs relate to the first 10 years of energy production from its wind facilities, which have had, and may continue to have, a material impact on Southern Power's cash flows and net income. At December 31, 2023, Southern Company and Southern Power had approximately $0.8 billion and $0.5 billion, respectively, of unutilized federal ITCs and PTCs, which are currently expected to be fully utilized by 2029, but could be further delayed. Since 2018, Southern Power has been utilizing tax equity partnerships for wind, solar, and battery energy storage projects, where the tax equity partner takes significantly all of the respective federal tax benefits. These tax equity partnerships are consolidated in Southern Company's and Southern Power's financial statements using the HLBV methodology to allocate partnership gains and losses.
In the third quarter 2023, Georgia Power started generating advanced nuclear PTCs for Plant Vogtle Unit 3 beginning on the in-service date of July 31, 2023. PTCs are recognized as an income tax benefit based on KWH production. In addition, pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 to the financial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 from the other Vogtle Owners. The gain recognized on the purchase of the joint owner PTCs is recognized as an income tax benefit. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information regarding Plant Vogtle Units 3 and 4.
See Note 1 to the financial statements under "General" for additional information on the HLBV methodology and Note 1 to the financial statements under "Asset Retirement Obligations"Income Taxes" and Other Costs of Removal"Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and "Effective Tax Rate" for additional information regarding utilization and amortization of credits and the Company's AROs astax benefit related to associated basis differences.
Inflation Reduction Act
In August 2022, the IRA was signed into law. The IRA extends, expands, and increases ITCs and PTCs for clean energy projects, allows PTCs for solar projects, adds ITCs for stand-alone energy storage projects with an option to elect out of December 31, 2017.the tax normalization requirement, and allows for the transferability of the tax credits. The IRA extends and increases the tax credits for carbon capture and sequestration projects and adds tax credits for clean hydrogen and nuclear projects. Additional ITC and PTC amounts are available if the projects meet domestic content requirements or are located in low-income or energy communities. The IRA also enacted a 15% corporate minimum tax on book income, with material adjustments for pension costs and tax depreciation. The 15% corporate minimum tax on book income can be reduced by energy tax credits.
For solar projects placed in service in 2022 through 2032, the IRA provides for a 30% ITC and an option to claim a PTC instead of an ITC. Starting in 2023 and through 2032, the IRA provides for a 30% ITC for stand-alone energy storage projects. For wind projects placed in service in 2022 through 2032, the IRA provides for a 100% PTC, adjusted for inflation annually. For projects placed in service before 2022, the 2023 PTC rate is 2.8 cents per KWH. For projects placed in service in 2022 and later, the 2023 PTC rate is 2.75 cents per KWH. The same PTC rate applies for solar projects for which the PTC option has been elected. To realize the full value of ITCs and PTCs, the IRA requires satisfaction of prevailing wage and apprenticeship requirements.
In June 2023, the IRS issued temporary regulations related to the transferability of tax credits. During the fourth quarter 2023, Southern Power executed an agreement to transfer certain PTCs generated in 2023. The discount recognized was booked through income tax expense and was immaterial. Southern Company and certain subsidiaries are considering the sale of additional tax credits that are eligible to be transferred.
Implementation of the IRA provisions is subject to the issuance of additional guidance by the U.S. Treasury Department and the IRS. The Registrants are still evaluating the impacts and the ultimate outcome of this matter cannot be determined at this time.
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Alabama Power Company 2017 Annual Report

Natural Gas Safe Harbor Method
Global Climate Issues
In 2015,April 2023, the EPA published final rules limiting CO2 emissions from new, modified,IRS issued Revenue Procedure 2023-15, which provides a safe harbor tax method of accounting that taxpayers may use to determine whether certain expenditures to maintain, repair, replace, or improve natural gas transmission and reconstructed fossil fuel-fired electric generating units and guidelinesdistribution property must be capitalized or allowed as repair deductions. The revenue procedure allows multiple alternatives for states to develop plans to meet EPA-mandated CO2 emission performance standards for existing units (known as the Clean Power Plan or CPP). In February 2016, the U.S. Supreme Court granted a stay of the CPP,implementation which will remainresult in effect through the resolution of litigation in the U.S. Court of Appealsa tax accounting method change for the District of Columbia challenging the legality of the CPP and any review by the U.S. Supreme Court. On March 28, 2017, the U.S. President signed an executive order directing agencies to review actions that potentially burden the development or use of domestically produced energy resources, including review of the CPP and other CO2 emissions rules. On October 10, 2017, the EPA published a proposed rule to repeal the CPP and, on December 28, 2017, published an advanced notice of proposed rulemaking regarding a CPP replacement rule.
In 2015, partiesSouthern Company Gas' eligible expenditures. Due to the United Nations Framework Convention on Climate Change, includingcomplexity of analysis needed and the United States, adoptedvarious implementation options allowed under the Paris Agreement, which established a non-binding universal framework for addressing greenhouse gas (GHG) emissions based on nationally determined contributions. On June 1, 2017,revenue procedure, Southern Company and Southern Company Gas are still evaluating the U.S. President announced thatimpacts and the United States would withdraw from the Paris Agreement and begin renegotiating its terms. The ultimate impactoutcome of this agreement or any renegotiated agreement depends on its implementation by participating countries.matter cannot be determined at this time. See Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" for additional information.
The EPA's GHG reporting rule requires annual reporting of GHG emissions expressed in terms of metric tons of CO2 equivalent emissions for a company's operational control of facilities. Based on ownership or financial control of facilities, the Company's 2016 GHG emissions were approximately 38 million metric tons of CO2 equivalent. The preliminary estimate of the Company's 2017 GHG emissions on the same basis is approximately 37 million metric tons of CO2 equivalent.
FERCGeneral Litigation and Other Matters
The CompanyRegistrants are involved in various matters being litigated and/or regulatory and other matters that could affect future earnings, cash flows, and/or financial condition. The ultimate outcome of such pending or potential litigation against each Registrant and any subsidiaries or regulatory and other matters cannot be determined at this time; however, for current proceedings and/or matters not specifically reported herein or in Notes 2 and 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings and/or matters would have a material effect on such Registrant's financial statements. See Notes 2 and 3 to the financial statements for a discussion of various contingencies, including matters being litigated, regulatory matters, and other matters which may affect future earnings potential.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Registrants prepare their financial statements in accordance with GAAP, which requires the use of estimates, judgments, and assumptions. Significant accounting policies are described in the notes to the financial statements. Detailed further herein are certain estimates made in the application of these policies that may have a material impact on the results of operations, financial condition, and related disclosures of the applicable Registrants (as indicated in the section descriptions herein). Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliancereviewed and discussed these critical accounting policies and estimates with the requirementsAudit Committee of an energy auction, whichSouthern Company's Board of Directors.
Utility Regulation (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
The traditional electric operating companies and the FERC foundnatural gas distribution utilities are subject to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority,retail regulation by their respective state PSCs or other applicable state regulatory agencies and wholesale regulation by the FERC. These regulatory agencies set the rates the traditional electric operating companies (includingand the Company) and Southern Power filednatural gas distribution utilities are permitted to charge customers based on allowable costs, including a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding thatreasonable ROE. As a result, the traditional electric operating companies' (includingcompanies and the Company's)natural gas distribution utilities apply accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and Southern Power's existing tailored mitigationthe recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards for rate regulated entities also impacts their financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may not effectively mitigate the potential to exert market power in certain areas serveddiffer from those actually incurred by the traditional electric operating companies and the natural gas distribution utilities; therefore, the accounting estimates inherent in some adjacent areas. The FERC directedspecific costs such as depreciation, AROs, and pension and other postretirement benefits have less of a direct impact on the traditional electricresults of operations and financial condition of the applicable Registrants than they would on a non-regulated company. Additionally, a regulatory agency may disallow recovery of all or a portion of certain assets. See Note 2 to the financial statements under "Southern Company Gas – Infrastructure Replacement Programs and Capital Projects – Nicor Gas" for information regarding the disallowance of certain capital investments at Nicor Gas and "Estimated Cost, Schedule, and Rate Recovery for the Construction of Plant Vogtle Units 3 and 4" herein for information regarding the Prudency Stipulation related to Georgia Power's construction of Plant Vogtle Units 3 and 4.
Revenues related to regulated utility operations as a percentage of total operating companies (includingrevenues in 2023 for the Company)applicable Registrants were as follows: 89% for Southern Company, 98% for Alabama Power, 96% for Georgia Power, 99% for Mississippi Power, and 87% for Southern PowerCompany Gas.
As reflected in Note 2 to show why market-based rate authority should not be revoked inthe financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these areasregulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact
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the Company)amounts of such regulatory assets and liabilities and could adversely impact the financial statements of the applicable Registrants.
Estimated Cost, Schedule, and Rate Recovery for the Construction of Plant Vogtle Units 3 and 4
(Southern Power filed a request for rehearingCompany and filed their response with the FERC in 2015.Georgia Power)
In December 2016, the traditional electric operating companies (includingGeorgia PSC approved a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with Georgia Power's fifteenth VCM report. In January 2018, the Company) and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERCGeorgia PSC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outsideapproving Georgia Power's seventeenth VCM report, which included a modification of the energy auction, finding that allVogtle Cost Settlement Agreement. The January 2018 order and the modified Vogtle Cost Settlement Agreement resolved certain regulatory matters related to Plant Vogtle Units 3 and 4 including, but not limited to: (i) Georgia Power's total project capital cost forecast of these changes$7.3 billion (net of $1.7 billion received under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds) was found reasonable and (ii) a prudence proceeding on cost recovery would provide adequate alternative mitigationoccur subsequent to achieving fuel load for Unit 4. On December 19, 2023, the traditional electric operating companies' (including the Company's) and SouthernGeorgia PSC voted to approve Georgia Power's potential to exert market power in certain areas servedApplication as modified by the traditional electric operating companies (including the Company) and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' (including the Company's) and Southern Power's compliance filing acceptingPrudency Stipulation. Under the terms of the order. Whileapproved Prudency Stipulation, Georgia Power will recover $7.562 billion in total construction and capital costs and associated retail rate base items of $1.02 billion, which includes AFUDC financing costs above $4.418 billion (the Georgia PSC-certified amount) up to $7.562 billion. The approval of the FERC's FebruaryApplication and the Prudency Stipulation resolves all issues for determination by the Georgia PSC regarding the reasonableness, prudence, and cost recovery for the remaining Plant Vogtle Units 3 and 4 construction and capital costs not already in retail base rates.
As of December 31, 2023, Georgia Power revised its total project capital cost forecast to $10.8 billion (net of $1.7 billion received under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds). This forecast includes construction contingency of $36 million and is based on the actual in-service date of July 2023 for Unit 3 and a projected in-service date during the second quarter 2024 for Unit 4. Since 2018, established construction contingency and additional costs totaling $2.7 billion have been assigned to the base capital cost forecast. Georgia Power did not seek rate recovery for the $0.7 billion increase to the base capital cost forecast included in the nineteenth VCM report and charged to income by Georgia Power in the second quarter 2018 and, until the prudency proceeding described above, did not seek rate recovery for subsequent construction and additional contingency costs assigned to the base capital cost forecast. After considering the significant level of uncertainty that existed regarding the future recoverability of these costs since the ultimate outcome of these matters was subject to the outcome of assessments by management, as well as Georgia PSC decisions in the related regulatory proceedings, Georgia Power recorded total pre-tax charges to income of $1.1 billion ($0.8 billion after tax) in 2018; $149 million ($111 million after tax) and $176 million ($131 million after tax) in the second quarter and the fourth quarter 2020, respectively; $48 million ($36 million after tax), $460 million ($343 million after tax), $264 million ($197 million after tax), and $480 million ($358 million after tax) in the first quarter 2021, the second quarter 2021, the third quarter 2021, and the fourth quarter 2021, respectively; and $36 million ($27 million after tax), $32 million ($24 million after tax), and $148 million ($110 million after tax) in the second quarter 2022, the third quarter 2022, and the fourth quarter 2022, respectively. As a result of the Georgia PSC's approval of the Prudency Stipulation, Georgia Power recorded a pre-tax credit to income of approximately $228 million ($170 million after tax) in the fourth quarter 2023 to recognize CWIP costs previously charged to income, which are now recoverable through retail rates. Associated AFUDC on these costs was also recognized.
In September 2022, Georgia Power and MEAG Power reached an agreement to resolve a dispute regarding the cost-sharing and tender provisions of the Global Amendments (as defined in Note 2 2017 order referencesto the market power proceeding discussed above, it remainsfinancial statements under "Georgia Power – Nuclear Construction – Joint Owner Contracts"). Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a separate, ongoing matter.portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project capital cost forecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the current project capital cost forecast, with no further adjustment for force majeure costs.
On October 25, 2017,5, 2023 and October 17, 2023, Georgia Power reached agreements with OPC and Dalton, respectively, to resolve its respective dispute with each of OPC and Dalton regarding the FERC issuedcost-sharing and tender provisions of the Global Amendments. Under the terms of the agreements with OPC and Dalton, among other items, (i) each of OPC and Dalton retracted its exercise of the tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4, (ii) Georgia Power made payments immediately after execution of the agreements of $308 million and $17 million to OPC and Dalton, respectively, representing payment for a portion of each of OPC's and Dalton's costs of construction for Plant Vogtle Units 3 and 4 previously incurred, (iii) Georgia Power will pay a portion of each of OPC's and Dalton's further costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will be in an orderaggregate amount of approximately $105 million and $6 million for OPC and Dalton, respectively, based on the current project capital cost forecast,
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and (iv) Georgia Power will pay 66% of each of OPC's and Dalton's costs of construction with respect to any amounts above the current project capital cost forecast, with no further adjustment for force majeure costs.
Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing provisions of the Global Amendments, including the settlement with MEAG Power. Based on the current project capital cost forecast and the settlements with OPC and Dalton described above, Georgia Power recorded a pre-tax charge to income of approximately $160 million ($120 million after tax) in response to the traditional electric operating companies' (includingthird quarter 2023. These charges are included in the Company's)total project capital cost forecast and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority shouldwill not be revokedrecovered from retail customers.
As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts for Unit 4 on a regular basis to incorporate current information available, particularly in certainthe areas adjacent toof start-up testing and related test results and engineering support.
The projected schedule for Unit 4 significantly depends on the area presently under mitigationprogression of start-up and pre-operational testing, which may be impacted by equipment or other operational failures. Any further delays could result in accordance witha later in-service date and cost increases.
Various design and other licensing-based compliance matters may result in additional license amendment requests or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies (including the Company) and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.Unit 4 project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time. However, any extension of the in-service date beyond June 2024 for Unit 4, including the current level of cost sharing described in Note 2, is estimated to result in additional base capital costs for Georgia Power of up to $25 million per month as well as any additional related construction, support resources, or testing costs. Pursuant to the Prudency Stipulation, any further changes to the capital cost forecast will not be recoverable through regulated rates and will be required to be charged to income, and such charges could be material.
Given the significant complexity involved in estimating the future costs to complete construction and start-up of Plant Vogtle Unit 4, as well as the potential impact on results of operations and cash flows, Southern Company and Georgia Power consider these items to be critical accounting estimates. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information.
Accounting for Income Taxes (Southern Company, Georgia Power, Mississippi Power, Southern Power, and Southern Company Gas)
The consolidated income tax provision and deferred income tax assets and liabilities, as well as any unrecognized tax benefits and valuation allowances, require significant judgment and estimates. These estimates are supported by historical tax return data, reasonable projections of taxable income, the ability and intent to implement tax planning strategies if necessary, and interpretations of applicable tax laws and regulations across multiple taxing jurisdictions. The effective tax rate reflects the statutory tax rates and calculated apportionments for the various states in which the Southern Company system operates.
Southern Company files a consolidated federal income tax return and the Registrants file various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and each subsidiary is allocated an amount of tax similar to that which would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability. Certain deductions and credits can be limited or utilized at the consolidated or combined level resulting in tax credit and/or state NOL carryforwards that would not otherwise result on a stand-alone basis. Utilization of these carryforwards and the assessment of valuation allowances are based on significant judgment and extensive analysis of Southern Company's and its subsidiaries' current financial position and results of operations, including currently available information about future years, to estimate when future taxable income will be realized. See Note 10 to the financial statements under "Deferred Tax Assets and Liabilities – Tax Credit Carryforwards" and " – Net Operating Loss Carryforwards" for additional information.
Current and deferred state income tax liabilities and assets are estimated based on laws of multiple states that determine the income to be apportioned to their jurisdictions. States have various filing methodologies and utilize specific formulas to calculate the apportionment of taxable income. The calculation of deferred state taxes considers apportionment factors and filing methodologies that are expected to apply in future years. Any apportionments and/or filing methodologies ultimately finalized in a manner inconsistent with expectations could have a material effect on the financial statements of the applicable Registrants.
Asset Retirement Obligations (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
Estimating AROs requires significant judgment. AROs are computed as the present value of the estimated costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the
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related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities.
The ARO liabilities for the traditional electric operating companies primarily relate to facilities that are subject to the CCR Rule and the related state rules, principally ash ponds. In addition, Alabama Power and Georgia Power have retirement obligations related to the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 through 3). Other significant AROs include various landfill sites and asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power.
The traditional electric operating companies and Southern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company system's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for certain retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these retirement obligations will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.
The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule and the related state rules. The traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to these assumptions becomes available. Some of these updates have been, and future updates may be, material. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. See Note 6 to the financial statements and FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein for additional information, including updates to AROs related to ash ponds recorded during 2023 by certain Registrants.
Pension and Other Postretirement Benefits (Southern Company, Alabama Power, Georgia Power, Mississippi Power, and Southern Company Gas)
The applicable Registrants' calculations of pension and other postretirement benefits expense are dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term rate of return (LRR) on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the applicable Registrants believe the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect their pension and other postretirement benefit costs and obligations.
Key elements in determining the applicable Registrants' pension and other postretirement benefit expense are the LRR and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. For purposes of determining the applicable Registrants' liabilities related to the pension and other postretirement benefit plans, Southern Company discounts the future related cash flows using a single-point discount rate for each plan developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. The discount rate assumption impacts both the service cost and non-service costs components of net periodic benefit costs as well as the projected benefit obligations.
The LRR on pension and other postretirement benefit plan assets is based on Southern Company's investment strategy, as described in Note 11 to the financial statements, historical experience, and expectations that consider external actuarial advice, and represents the average rate of earnings expected over the long term on the assets invested to provide for anticipated future benefit payments. Southern Company determines the amount of the expected return on plan assets component of non-service costs by applying the LRR of various asset classes to Southern Company's target asset allocation. The LRR only impacts the non-service costs component of net periodic benefit costs for the following year and is set annually at the beginning of the year.
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The following table illustrates the sensitivity to changes in the applicable Registrants' long-term assumptions with respect to the discount rate, salary increases, and the long-term rate of return on plan assets:
Increase/(Decrease) in
25 Basis Point Change in:Total Benefit Expense for 2024Projected Obligation for Pension Plan at December 31, 2023
Projected Obligation for
Other Postretirement
Benefit Plans at December 31, 2023
(in millions)
Discount rate:
Southern Company$35/$(32)$419/$(397)$34/$(32)
Alabama Power$9/$(9)$101/$(96)$9/$(8)
Georgia Power$9/$(9)$122/$(116)$11/$(11)
Mississippi Power$2/$(1)$18/$(18)$1/$(1)
Southern Company Gas$2/$(2)$27/$(25)$4/$(4)
Salaries:
Southern Company$18/$(17)$87/$(84)$–/$–
Alabama Power$5/(5)$24/$(23)$–/$–
Georgia Power$5/(5)$23/$(23)$–/$–
Mississippi Power$1/$(1)$4/$(4)$–/$–
Southern Company Gas$1/$(1)$3/$(3)$–/$–
Long-term return on plan assets:
Southern Company$41/$(41)N/AN/A
Alabama Power$10/$(10)N/AN/A
Georgia Power$13/$(13)N/AN/A
Mississippi Power$2/$(2)N/AN/A
Southern Company Gas$3/$(3)N/AN/A
See Note 11 to the financial statements for additional information regarding pension and other postretirement benefits.
Impairment (Southern Company, Southern Power, and Southern Company Gas)
Goodwill (Southern Company and Southern Company Gas)
The acquisition method of accounting for business combinations requires the assets acquired and liabilities assumed to be recorded at the date of acquisition at their respective estimated fair values. The applicable Registrants have recognized goodwill as of the date of their acquisitions, as a residual over the fair values of the identifiable net assets acquired. Goodwill is recorded at the reporting unit level, which is the operating segment or a business one level below the operating segment (a component), if discrete financial information is prepared and regularly reviewed by management. Components are aggregated if they have similar economic characteristics. Goodwill is tested for impairment at the reporting unit level on an annual basis in the fourth quarter of the year and on an interim basis if events and circumstances occur that indicate goodwill may be impaired.
Goodwill is evaluated for impairment either under the qualitative assessment option or the quantitative option to determine the fair value of the reporting unit. If goodwill is determined to be impaired, an impairment loss measured at the amount by which the reporting unit's carrying amount exceeds its fair value, not to exceed the carrying amount of goodwill, is recorded.
Goodwill for Southern Company and Southern Company Gas was $5.2 billion and $5.0 billion, respectively, at December 31, 2023. During 2022, Southern Company recorded a $119 million impairment loss as a result of its annual goodwill impairment test for PowerSecure.
The judgments made in determining the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can significantly impact the applicable Registrant's results of operations. Fair values and useful lives are determined based on, among other factors, the expected future period of benefit of the asset, the various characteristics of the asset, and projected cash flows. As the determination of an asset's fair value and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the applicable Registrants consider these estimates to be critical accounting estimates.
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See Note 1 to the financial statements under "Goodwill and Other Intangible Assets" for additional information regarding the applicable Registrants' goodwill.
Long-Lived Assets (Southern Company, Southern Power, and Southern Company Gas)
The applicable Registrants assess their other long-lived assets for impairment whenever events or changes in circumstances indicate that an asset's carrying amount may not be recoverable. If an impairment indicator exists, the asset is tested for recoverability by comparing the asset carrying amount to the sum of the undiscounted expected future cash flows directly attributable to the asset's use and eventual disposition. If the estimate of undiscounted future cash flows is less than the carrying amount of the asset, the fair value of the asset is determined and a loss is recorded equal to the difference between the carrying amount and the fair value of the asset. In addition, when assets are identified as held for sale, an impairment loss is recognized to the extent the carrying amount of the assets or asset group exceeds their fair value less cost to sell. A high degree of judgment is required in developing estimates related to these evaluations, which are based on projections of various factors, some of which have been quite volatile in recent years.
Southern Power's investments in long-lived assets are primarily generation assets. Excluding the natural gas distribution utilities, Southern Company Gas' investments in long-lived assets are primarily natural gas transportation assets.
For Southern Power, examples of impairment indicators could include, but are not limited to, significant changes in construction schedules, current period losses combined with a history of losses or a projection of continuing losses, a significant decrease in market prices, changes in tax legislation, the inability to remarket generating capacity for an extended period, the unplanned termination of a customer contract, or the inability of a customer to perform under the terms of the contract. For Southern Company Gas, examples of impairment indicators could include, but are not limited to, significant changes in the U.S. natural gas storage market, construction schedules, current period losses combined with a history of losses or a projection of continuing losses, a significant decrease in market prices, the inability to renew or extend customer contracts or the inability of a customer to perform under the terms of the contract, attrition rates, or the inability to deploy a development project.
As the determination of the expected future cash flows generated from an asset, an asset's fair value, and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the applicable Registrants consider these estimates to be critical accounting estimates.
During 2021, Southern Company recorded impairment charges totaling $7 million ($6 million after tax) related to its leveraged lease investments. During 2022, Southern Company Gas recorded pre-tax impairment charges totaling $131 million ($99 million after tax) related to natural gas storage facilities. During 2021, Southern Company Gas recorded total pre-tax impairment charges of $84 million ($67 million after tax) related to its equity method investment in the PennEast Pipeline project. See Notes 7 and 9 to the financial statements under "Southern Company Gas" and "Southern Company Leveraged Lease," respectively, and Note 15 to the financial statements for additional information on recent asset impairments.
Revenue Recognition (Southern Power)
Southern Power's power sale transactions, which include PPAs, are classified in one of four general categories: leases, normal sale derivatives or contracts with customers, derivatives designated as cash flow hedges, and derivatives not designated as hedges. Southern Power's revenues are dependent upon significant judgments used to determine the appropriate transaction classification, which must be documented upon the inception of each contract. The two categories with the most judgment required for Southern Power are described further below.
Lease Transactions
Southern Power considers the terms of a sales contract to determine whether it should be accounted for as a lease. A contract is or contains a lease if the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. If the contract meets the criteria for a lease, Southern Power performs further analysis to determine whether the lease is classified as operating, financing, or sales-type. Generally, Southern Power's power sales contracts that are determined to be leases are accounted for as operating leases and the capacity revenue is recognized on a straight-line basis over the term of the contract and is included in Southern Power's operating revenues. Energy revenues and other contingent revenues are recognized in the period the energy is delivered or the service is rendered. For those contracts that are determined to be sales-type leases, capacity revenues are recognized by accounting for interest income on the net investment in the lease and are included in Southern Power's operating revenues. See Note 9 to the financial statements for additional information.
Normal Sale Derivative Transactions and Contracts with Customers
If the power sales contract is not classified as a lease, Southern Power further considers whether the contract meets the definition of a derivative. If the contract does meet the definition of a derivative, Southern Power will assess whether it can be designated as
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a normal sale contract. The determination of whether a contract can be designated as a normal sale contract requires judgment, including whether the sale of electricity involves physical delivery in quantities within Southern Power's available generating capacity and that the purchaser will take quantities expected to be used or sold in the normal course of business.
Contracts that do not meet the definition of a derivative or are designated as normal sales are accounted for as revenue from contracts with customers. For contracts that have a capacity charge, the revenue is generally recognized in the period that it becomes billable. Revenues related to energy and ancillary services are recognized in the period the energy is delivered or the service is rendered. See Note 4 to the financial statements for additional information.
Acquisition Accounting (Southern Power)
Southern Power may acquire generation assets as part of its overall growth strategy. At the time of an acquisition, Southern Power will assess if these assets and activities meet the definition of a business. Acquisitions that meet the definition of a business are accounted for under the acquisition method, whereby the identifiable assets acquired, liabilities assumed, and any noncontrolling interests (including any intangible assets, primarily related to acquired PPAs) are recognized and measured at fair value. Assets acquired that do not meet the definition of a business are accounted for as an asset acquisition. The purchase price of each asset acquisition is allocated based on the relative fair value of assets acquired.
Determining the fair value of assets acquired and liabilities assumed requires management judgment and Southern Power may engage independent valuation experts to assist in this process. Fair values are determined by using market participant assumptions and typically include the timing and amounts of future cash flows, incurred construction costs, the nature of acquired contracts, discount rates, power market prices, and expected asset lives. For potential or successful acquisitions that meet the definition of a business, any due diligence or transaction costs incurred are expensed as incurred. If the acquisition is an asset acquisition, direct and incremental transaction costs can be capitalized as a component of the cost of the assets acquired.
See Note 13 to the financial statements for additional fair value information and Note 15 to the financial statements for additional information on recent acquisitions.
Variable Interest Entities (Southern Power)
Southern Power enters into partnerships with varying ownership structures. Upon entering into these arrangements, membership interests and other variable interests are evaluated to determine if the legal entity is a VIE. If the legal entity is a VIE, Southern Power will assess if it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE, making it the primary beneficiary. Making this determination may require significant management judgment.
If Southern Power is the primary beneficiary and is considered to have a controlling ownership, the assets, liabilities, and results of operations of the entity are consolidated. If Southern Power is not the primary beneficiary, the legal entity is generally accounted for under the equity method of accounting. Southern Power reconsiders its conclusions as to whether the legal entity is a VIE and whether it is the primary beneficiary for events that impact the rights of variable interests, such as ownership changes in membership interests.
Southern Power has controlling ownership in certain legal entities for which the contractual provisions represent profit-sharing arrangements because the allocations of cash distributions and tax benefits are not based on fixed ownership percentages. For these arrangements, the noncontrolling interest is accounted for under a balance sheet approach utilizing the HLBV method. The HLBV method calculates each partner's share of income based on the change in net equity the partner can legally claim in a HLBV at the end of the period compared to the beginning of the period.
Contingent Obligations (All Registrants)
The Registrants are subject to a number of federal and state laws and regulations, as well as other factors and conditions that subject them to environmental, litigation, and other risks. See FUTURE EARNINGS POTENTIAL herein and Notes 2 and 3 to the financial statements for more information regarding certain of these contingencies. The Registrants periodically evaluate their exposure to such risks and record reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the results of operations, cash flows, or financial condition of the Registrants.
Recently Issued Accounting Standards
See Note 1 to the financial statements under "Recently Adopted Accounting Standards" for additional information.
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FINANCIAL CONDITION AND LIQUIDITY
Overview
The financial condition of each Registrant remained stable at December 31, 2023. The Registrants' cash requirements primarily consist of funding ongoing operations, including unconsolidated subsidiaries, as well as common stock dividends, capital expenditures, and debt maturities. Southern Power's cash requirements also include distributions to noncontrolling interests. Capital expenditures and other investing activities for the traditional electric operating companies include investments to build new generation facilities to meet projected long-term demand requirements and to replace units being retired as part of the generation fleet transition, to maintain existing generation facilities, to comply with environmental regulations including adding environmental modifications to certain existing generating units and closures of ash ponds, to expand and improve transmission and distribution facilities, and for restoration following major storms. Southern Power's capital expenditures and other investing activities may include acquisitions or new construction associated with its overall growth strategy and to maintain its existing generation fleet's performance. Southern Company Gas' capital expenditures and other investing activities include investments to meet projected long-term demand requirements, to maintain existing natural gas distribution systems as well as to update and expand these systems, and to comply with environmental regulations. See "Cash Requirements" herein for additional information.
Operating cash flows provide a substantial portion of the Registrants' cash needs. During 2023, Southern Power utilized tax credits, which provided $332 million in operating cash flows. For the three-year period from 2024 through 2026, projected stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows for each of Southern Company, the traditional electric operating companies, and Southern Company Gas. Southern Company plans to finance future cash needs in excess of its operating cash flows through one or more of the following: accessing borrowings from financial institutions, issuing debt and hybrid securities in the capital markets, and/or through its stock plans. Each Subsidiary Registrant plans to finance its future cash needs in excess of its operating cash flows primarily through external securities issuances, borrowings from financial institutions, and equity contributions from Southern Company. In addition, Southern Power may utilize tax equity partnership contributions. The Registrants plan to use commercial paper to manage seasonal variations in operating cash flows and for other working capital needs and continue to monitor their access to short-term and long-term capital markets as well as their bank credit arrangements to meet future capital and liquidity needs. See "Sources of Capital" and "Financing Activities" herein for additional information.
The Registrants' investments in their qualified pension plans and Alabama Power's and Georgia Power's investments in their nuclear decommissioning trust funds increased in value at December 31, 2023 as compared to December 31, 2022. No contributions to the qualified pension plan were made during 2023 and no mandatory contributions to the qualified pension plans are anticipated during 2024. See Notes 6 and 11 to the financial statements under "Nuclear Decommissioning" and "Pension Plans," respectively, for additional information.
At the end of 2023, the market price of Southern Company's common stock was $70.12 per share (based on the closing price as reported on the NYSE) and the book value was $28.83 per share, representing a market-to-book value ratio of 243%, compared to $71.41, $27.93, and 256%, respectively, at the end of 2022.
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Cash Requirements
Capital Expenditures
Total estimated capital expenditures, including LTSA and nuclear fuel commitments, for the Registrants through 2028 based on their current construction programs are as follows:
20242025202620272028
(in billions)
Southern Company(a)(b)
$10.0 $9.4 $8.5 $8.6 $8.7 
Alabama Power2.1 2.0 1.9 2.0 1.9 
Georgia Power(a)
5.4 5.0 4.4 4.5 4.7 
Mississippi Power0.3 0.3 0.2 0.3 0.3 
Southern Power(b)
0.3 0.2 0.1 0.1 0.1 
Southern Company Gas1.8 1.8 1.7 1.7 1.7 
(a)Includes expenditures of approximately $0.2 billion in 2024 for the construction of Plant Vogtle Unit 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information. Also includes certain expenditures related to the construction of Plant Yates Units 8 through 10 as requested in Georgia Power's 2023 IRP Update filing, which is subject to the approval of the Georgia PSC. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
(b)Includes $0.1 billion in both 2024 and 2025 related to the South Cheyenne and Millers Branch solar projects. Excludes approximately $0.8 billion annually for Southern Power's planned acquisitions and placeholder growth, which may vary materially due to market opportunities and Southern Power's ability to execute its growth strategy. Also excludes estimated capital expenditures associated with the phase two expansion of the Millers Branch solar project, which was committed to subsequent to December 31, 2023. See Note 15 to the financial statements under "Southern Power" for additional information regarding the South Cheyenne and Millers Branch solar projects.
These capital expenditures include estimates to comply with environmental laws and regulations, but do not include compliance costs associated with potential regulation of GHG emissions or the proposed ELG Supplemental Rule. See FUTURE EARNINGS POTENTIAL – "Environmental Matters" herein for additional information. At December 31, 2023, significant purchase commitments were outstanding in connection with the Registrants' construction programs.
The traditional electric operating companies also anticipate continued expenditures associated with closure and monitoring of ash ponds and landfills in accordance with the CCR Rule and the related state rules, which are reflected in the applicable Registrants' ARO liabilities. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. These estimated costs are likely to change, and could change materially, as assumptions and details pertaining to closure are refined and compliance activities continue. Current estimates of these costs through 2028 are provided in the table below. Material expenditures in future years for ARO settlements will also be required for ash ponds, nuclear decommissioning (for Alabama Power and Georgia Power), and other liabilities reflected in the applicable Registrants' AROs, as discussed further in Note 6 to the financial statements. Also see FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein.
20242025202620272028
(in millions)
Southern Company$728 $767 $762 $725 $669 
Alabama Power346 364 299 237 216 
Georgia Power338 347 429 450 450 
Mississippi Power24 30 17 
The construction programs are subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; changes in environmental laws and regulations; the outcome of any legal challenges to environmental rules; changes in electric generating plants, including unit retirements and replacements and adding or changing fuel sources at existing electric generating units, to meet regulatory requirements; changes in FERC rules and regulations; state regulatory agency approvals; changes in the expected environmental compliance program; changes in legislation and/or regulation; the cost, availability, and efficiency of construction labor, equipment, and materials; project scope and design changes; abnormal weather; delays in construction due to judicial or regulatory action; storm impacts; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures and AROs will be fully recovered. Additionally, expenditures associated with Southern Power's planned
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acquisitions may vary due to market opportunities and the execution of its growth strategy. See Note 15 to the financial statements under "Southern Power" for additional information regarding Southern Power's plant acquisitions and construction projects.
The construction program of Georgia Power includes Plant Vogtle Unit 4, which includes components based on new technology that only within the last several years began initial operation in the global nuclear industry at this scale and which may be subject to additional revised cost estimates during construction. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for information regarding Plant Vogtle Unit 4 and additional factors that may impact construction expenditures.
See FUTURE EARNINGS POTENTIAL – "Construction Programs" herein for additional information.
Other Significant Cash Requirements
Long-term debt maturities and the interest payable on long-term debt each represent a significant cash requirement for the Registrants. See Note 8 to the financial statements for information regarding the Registrants' long-term debt at December 31, 2023, the weighted average interest rate applicable to each long-term debt category, and a schedule of long-term debt maturities over the next five years. The Registrants plan to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Fuel and purchased power costs represent a significant component of funding ongoing operations for the traditional electric operating companies and Southern Power. See Note 3 to the financial statements under "Commitments" for information on Southern Company Gas' commitments for pipeline charges, storage capacity, and gas supply. Total estimated costs for fuel and purchased power commitments at December 31, 2023 for the applicable Registrants are provided in the table below. Fuel costs include purchases of coal (for the traditional electric operating companies) and natural gas (for the traditional electric operating companies and Southern Power), as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery; the amounts reflected below have been estimated based on the NYMEX future prices at December 31, 2023. As discussed under "Capital Expenditures" herein, estimated expenditures for nuclear fuel are included in the applicable Registrants' construction programs for the years 2024 through 2028. Nuclear fuel commitments at December 31, 2023 that extend beyond 2028 are included in the table below. Purchased power costs represent estimated minimum obligations for various PPAs for the purchase of capacity and energy, except for those accounted for as leases, which are discussed in Note 9 to the financial statements.
20242025202620272028Thereafter
(in millions)
Southern Company(*)
$3,347 $3,151 $2,201 $1,738 $1,171 $4,820 
Alabama Power1,210 1,181 819 619 328 1,136 
Georgia Power(*)
1,262 1,111 696 579 471 2,008 
Mississippi Power377 420 338 263 213 1,002 
Southern Power558 502 414 346 232 674 
(*)Excludes capacity payments related to Plant Vogtle Units 1 and 2, which are discussed in Note 3 to the financial statements under "Commitments."
In connection with Georgia Power's 2022 IRP, the Georgia PSC approved five affiliate PPAs with Southern Power, which are expected to be accounted for as leases, and are contingent upon approval by the FERC. The expected capacity payments associated with the PPAs total $5 million in 2024, $68 million in 2025, $75 million in 2026, $76 million in 2027, $86 million in 2028, and $584 million thereafter. In connection with Georgia Power's 2023 IRP Update, Georgia Power has requested certification of a non-affiliate PPA, which is expected to be accounted for as a lease and is contingent upon approval by the Georgia PSC. The expected capacity payments associated with the PPA are $10 million in 2024, $17 million in 2025, $18 million in 2026, $19 million in 2027, and $19 million in 2028. See Note 2 to the financial statements under "Georgia Power – Integrated Resource Plans" for additional information.
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The traditional electric operating companies and Southern Power have entered into LTSAs for the purpose of securing maintenance support for certain of their generating facilities. See Note 1 to the financial statements under "Long-term Service Agreements" for additional information. As discussed under "Capital Expenditures" herein, estimated expenditures related to LTSAs are included in the applicable Registrants' construction programs for the years 2024 through 2028. Total estimated payments for LTSA commitments at December 31, 2023 that extend beyond 2028 are provided in the following table and include price escalation based on inflation indices:
Southern
Company
Alabama PowerGeorgia
Power
Mississippi PowerSouthern Power
(in millions)
LTSA commitments (after 2028)$1,594 $262 $252 $152 $928 
In addition, Southern Power has certain other operations and maintenance agreements. Total estimated costs for these commitments at December 31, 2023 are provided in the table below.
20242025202620272028Thereafter
(in millions)
Southern Power's operations and maintenance agreements$74 $45 $33 $30 $30 $226 
See Note 9 to the financial statements for information on the Registrants' operating lease obligations, including a maturity analysis of the lease liabilities over the next five years and thereafter.
Sources of Capital
Southern Company intends to meet its future capital needs through operating cash flows, borrowings from financial institutions, and debt, hybrid, and/or equity issuances. Equity capital can be provided from any combination of Southern Company's stock plans, private placements, or public offerings.
The Subsidiary Registrants plan to obtain the funds to meet their future capital needs from sources similar to those they used in the past, which were primarily from operating cash flows, external securities issuances, borrowings from financial institutions, and equity contributions from Southern Company. Operating cash flows provide a substantial portion of the Registrants' cash needs. Georgia Power intends to utilize a mix of senior note issuances, short-term floating rate bank loans, and commercial paper issuances to continue funding operating cash flows related to fuel cost under recovery.
The amount, type, and timing of any financings in 2024, as well as in subsequent years, will be contingent on investment opportunities and the Registrants' capital requirements and will depend upon prevailing market conditions, regulatory approvals (for certain of the Subsidiary Registrants), and other factors. See "Cash Requirements" herein for additional information.
Southern Power utilizes tax equity partnerships as one of its financing sources, where the tax partner takes significantly all of the federal tax benefits. These tax equity partnerships are consolidated in Southern Power's financial statements and are accounted for using HLBV methodology to allocate partnership gains and losses. During 2023, Southern Power obtained tax equity funding for existing tax equity partnerships totaling $21 million. See Notes 1 and 15 to the financial statements under "General" and "Southern Power," respectively, for additional information.
The issuance of securities by the traditional electric operating companies and Nicor Gas is generally subject to the approval of the applicable state PSC or other applicable state regulatory agency. The issuance of all securities by Mississippi Power and short-term securities by Georgia Power is generally subject to regulatory approval by the FERC. Additionally, with respect to the public offering of securities, Southern Company, the traditional electric operating companies, and Southern Power (excluding its subsidiaries), Southern Company Gas Capital, and Southern Company Gas (excluding its other subsidiaries) file registration statements with the SEC under the Securities Act of 1933, as amended (1933 Act). The amounts of securities authorized by the appropriate regulatory authorities, as well as the securities registered under the 1933 Act, are closely monitored and appropriate filings are made to ensure flexibility in the capital markets.
The Registrants generally obtain financing separately without credit support from any affiliate. See Note 8 to the financial statements under "Bank Credit Arrangements" for additional information. The Southern Company system does not maintain a centralized cash or money pool. Therefore, funds of each company are not commingled with funds of any other company in the Southern Company system, except in the case of Southern Company Gas, as described below.
The traditional electric operating companies and SEGCO may utilize a Southern Company subsidiary organized to issue and sell commercial paper at their request and for their benefit. Proceeds from such issuances for the benefit of an individual company are loaned directly to that company. The obligations of each traditional electric operating company and SEGCO under these
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arrangements are several and there is no cross-affiliate credit support. Alabama Power also maintains its own separate commercial paper program.
Southern Company Gas Capital obtains external financing for Southern Company Gas and its subsidiaries, other than Nicor Gas, which obtains financing separately without credit support from any affiliates. Southern Company Gas maintains commercial paper programs at Southern Company Gas Capital and Nicor Gas. Nicor Gas' commercial paper program supports its working capital needs as Nicor Gas is not permitted to make money pool loans to affiliates. All of the other Southern Company Gas subsidiaries benefit from Southern Company Gas Capital's commercial paper program.
By regulation, Nicor Gas is restricted, up to its retained earnings balance, in the amount it can dividend or loan to affiliates and is not permitted to make money pool loans to affiliates. At December 31, 2023, the amount of subsidiary retained earnings restricted to dividend totaled $1.7 billion. This restriction did not impact Southern Company Gas' ability to meet its cash obligations, nor does management expect such restriction to materially impact Southern Company Gas' ability to meet its currently anticipated cash obligations.
Certain Registrants' current liabilities frequently exceed their current assets because of long-term debt maturities and the periodic use of short-term debt as a funding source, as well as significant seasonal fluctuations in cash needs. The Registrants generally plan to refinance long-term debt as it matures. See Note 8 to the financial statements for additional information. Also see "Financing Activities" herein for information on financing activities that occurred subsequent to December 31, 2023. The following table shows the amount by which current liabilities exceeded current assets at December 31, 2023 for the applicable Registrants:
At December 31, 2023Southern
Company
Georgia
Power
Mississippi PowerSouthern Company Gas
(in millions)
Current liabilities in excess of current assets$3,035 $1,674 $314 $222 
The Registrants believe the need for working capital can be adequately met by utilizing operating cash flows, as well as commercial paper, lines of credit, and short-term bank notes, as market conditions permit. In addition, under certain circumstances, the Subsidiary Registrants may utilize equity contributions and/or loans from Southern Company.
Bank Credit Arrangements
At December 31, 2023, the Registrants' unused committed credit arrangements with banks were as follows:
At December 31, 2023Southern
Company
parent
Alabama PowerGeorgia
Power
Mississippi Power
Southern
 Power(a)
Southern Company Gas(b)
SEGCOSouthern
Company
(in millions)
Unused committed credit$1,998 $1,350 $1,726 $275 $589 $1,598 $30 $7,566 
(a)At December 31, 2023, Southern Power also had two continuing letters of credit facilities for standby letters of credit, of which $15 million was unused. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities.
(b)Includes $798 million and $800 million at Southern Company Gas Capital and Nicor Gas, respectively.
Subject to applicable market conditions, the Registrants, Nicor Gas, and SEGCO expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, the Registrants, Nicor Gas, and SEGCO may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
A portion of the unused credit with banks is allocated to provide liquidity support to certain revenue bonds of the traditional electric operating companies and the commercial paper programs of the Registrants, Nicor Gas, and SEGCO. At December 31, 2023, outstanding variable rate demand revenue bonds of the traditional electric operating companies with allocated liquidity support totaled approximately $1.7 billion (comprised of approximately $818 million at Alabama Power, $819 million at Georgia Power, and $69 million at Mississippi Power). In addition, at December 31, 2023, Georgia Power had approximately $325 million of fixed rate revenue bonds outstanding that are required to be remarketed within the next 12 months. The variable rate demand revenue bonds and fixed rate revenue bonds required to be remarketed within the next 12 months are classified as long-term debt on the balance sheets as a result of available long-term committed credit.
See Note 8 to the financial statements under "Bank Credit Arrangements" for additional information.
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Short-term Borrowings
The Registrants, Nicor Gas, and SEGCO make short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above. Southern Power's subsidiaries are not issuers or obligors under its commercial paper program. Commercial paper and short-term bank term loans are included in notes payable in the balance sheets. Details of the Registrants' short-term borrowings were as follows:
Short-term Debt at the End of the Period
Amount
Outstanding
Weighted Average
Interest Rate
December 31,December 31,
202320222021202320222021
(in millions)
Southern Company$2,314 $2,609 $1,440 5.7 %4.9 %0.4 %
Alabama Power40 — — 5.5 — — 
Georgia Power1,329 1,600 — 5.9 5.0 — 
Southern Power138 225 211 5.5 4.7 0.3 
Southern Company Gas:
Southern Company Gas Capital$23 $285 $379 5.5 %4.8 %0.3 %
Nicor Gas392 483 830 5.5 4.7 0.4 
Southern Company Gas Total$415 $768 $1,209 5.5 %4.7 %0.4 %
Short-term Debt During the Period(*)
Average Amount OutstandingWeighted Average
Interest Rate
Maximum Amount Outstanding
202320222021202320222021202320222021
(in millions)(in millions)
Southern Company$2,191 $1,995 $1,141 5.6 %2.2 %0.3 %$3,270 $2,894 $1,809 
Alabama Power44 27 5.0 2.1 0.1 230 200 200 
Georgia Power1,440 673 95 5.8 3.1 0.2 2,260 1,710 407 
Mississippi Power56 15 5.5 1.6 0.2 169 71 81 
Southern Power158 166 133 5.6 2.3 0.2 359 350 520 
Southern Company Gas:
Southern Company Gas Capital$163 $279 $206 5.3 %1.8 %0.2 %$440 $547 $485 
Nicor Gas88 349 420 5.1 2.1 0.4 483 830 897 
Southern Company Gas Total$251 $628 $626 5.2 %2.0 %0.4 %
(*)    Average and maximum amounts are based upon daily balances during the 12-month periods ended December 31, 2023, 2022, and 2021.
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Analysis of Cash Flows
Net cash flows provided from (used for) operating, investing, and financing activities in 2023 and 2022 are presented in the following table:
Net cash provided from (used for):Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Operating activities$7,553 $2,079 $2,752 $369 $1,096 $1,762 
Investing activities(9,668)(2,196)(5,079)(370)(265)(1,656)
Financing activities999 (161)1,922 (20)(820)(154)
2022
Operating activities$6,302 $1,639 $2,038 $383 $815 $1,519 
Investing activities(8,430)(2,263)(3,954)(317)(194)(1,580)
Financing activities2,336 251 2,363 (68)(623)96 
Fluctuations in cash flows from financing activities vary from year to year based on capital needs and the maturity or redemption of securities.
Southern Company
Net cash provided from operating activities increased $1.3 billion in 2023 as compared to 2022 primarily due to increased fuel cost recovery and the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to the Subsidiary Registrants' construction programs.
The net cash provided from financing activities in 2023 was primarily related to net issuances of long-term debt and an increase in commercial paper borrowings, partially offset by common stock dividend payments and net repayments of short-term bank loans. The net cash provided from financing activities in 2022 was primarily related to net issuances of long-term debt, the issuance of common stock to settle the purchase contracts entered into as part of the Equity Units (as discussed in Note 8 to the financial statements under "Equity Units"), and an increase in short-term borrowings, partially offset by common stock dividend payments.
Alabama Power
Net cash provided from operating activities increased $440 million in 2023 as compared to 2022 primarily due to an increase in fuel cost recovery and the timing of customer receivable collections, partially offset by the timing of vendor payments and fuel stock purchases.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions, including approximately $79 million and $211 million, respectively, related to the construction of Plant Barry Unit 8 and, for 2022, $171 million related to the acquisition of the Calhoun Generating Station. See Notes 2 and 15 to the financial statements under "Alabama Power" for additional information.
The net cash used for financing activities in 2023 was primarily related to common stock dividend payments, largely offset by net issuances of long-term debt and capital contributions from Southern Company. The net cash provided from financing activities in 2022 was primarily related to net long-term debt issuances and capital contributions from Southern Company, partially offset by common stock dividend payments and preferred stock redemptions.
Georgia Power
Net cash provided from operating activities increased $714 million in 2023 as compared to 2022 primarily due to increased fuel cost recovery, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions, including approximately $1.1 billion and $1.0 billion, respectively, related to the construction of Plant Vogtle Units 3 and 4. See Note 2 to the financial statements under "Georgia Power – Nuclear Construction" for additional information on construction of Plant Vogtle Units 3 and 4.
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The net cash provided from financing activities in 2023 was primarily related to capital contributions from Southern Company, net issuances of senior notes, an increase in commercial paper borrowings, and reofferings of pollution control revenue bonds which were previously held by Georgia Power, partially offset by common stock dividend payments and a net decrease in short-term borrowings. The net cash provided from financing activities in 2022 was primarily related to a net increase in short-term bank debt, capital contributions from Southern Company, and net issuances of senior notes, partially offset by common stock dividend payments.
Mississippi Power
Net cash provided from operating activities decreased $14 million in 2023 as compared to 2022 primarily due to the timing of vendor payments, partially offset by a decrease in power pool sales and the timing of customer receivable collections.
The net cash used for investing activities in 2023 and 2022 was primarily related to gross property additions.
The net cash used for financing activities in 2023 was primarily related to common stock dividend payments, partially offset by the issuance of senior notes. The net cash used for financing activities in 2022 was primarily related to common stock dividend payments, partially offset by capital contributions from Southern Company and the issuance of revenue bonds.
Southern Power
Net cash provided from operating activities increased $281 million in 2023 as compared to 2022 primarily due to an increase in the utilization of tax credits and the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 was primarily related to the acquisitions of the South Cheyenne and Millers Branch solar facilities and ongoing construction activities. The net cash used for investing activities in 2022 was primarily related to ongoing construction activities. See Note 15 to the financial statements under "Southern Power" for additional information.
The net cash used for financing activities in 2023 was primarily related to the repayment of senior notes at maturity, common stock dividend payments, net distributions to noncontrolling interests, and net repayments of short-term debt. The net cash used for financing activities in 2022 was primarily related to the repayment of senior notes at maturity, common stock dividend payments, and net capital distributions to noncontrolling interests, partially offset by capital contributions from Southern Company.
Southern Company Gas
Net cash provided from operating activities increased $243 million in 2023 as compared to 2022 primarily due to the timing of customer receivable collections, partially offset by the timing of vendor payments.
The net cash used for investing activities in 2023 and 2022 was primarily related to construction of transportation and distribution assets recovered through base rates and infrastructure investment recovered through replacement programs at gas distribution operations, partially offset by proceeds from dispositions. See Note 15 to the financial statements for additional information.
The net cash used for financing activities in 2023 was primarily related to repayment of short-term borrowings and common stock dividend payments, partially offset by net issuances of long-term debt and capital contributions from Southern Company. The net cash provided from financing activities in 2022 was primarily related to net issuances of long-term debt and capital contributions from Southern Company, partially offset by common stock dividend payments and a decrease in short-term borrowings.
Significant Balance Sheet Changes
Southern Company
Significant balance sheet changes in 2023 for Southern Company included:
an increase of $5.3 billion in total property, plant, and equipment primarily related to the Subsidiary Registrants' construction programs;
an increase of $4.7 billion in long-term debt (including securities due within one year) related to new issuances;
a decrease of $1.2 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Southern Company" herein;
an increase of $1.0 billion in total common stockholders' equity primarily related to net income, partially offset by common stock dividend payments;
an increase of $1.0 billion in accumulated deferred income taxes primarily related to an increase in property-related timing differences and the expected utilization of ITCs;
a decrease of $0.6 billion in accounts payable primarily related to the timing of vendor payments;
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a decrease of $0.6 billion in deferred credits related to income taxes primarily due to the flowback of excess deferred income taxes; and
a decrease of $0.5 billion in AROs primarily due to cost estimate updates at Georgia Power for ash pond closures.
See "Financing Activities" herein and Notes 2, 5, 6, 8, and 10 to the financial statements for additional information.
Alabama Power
Significant balance sheet changes in 2023 for Alabama Power included:
an increase of $0.8 billion in total property, plant, and equipment primarily related to the construction of Plant Barry Unit 8 and construction of distribution and transmission facilities;
an increase of $0.6 billion in total common stockholder's equity primarily due to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company;
an increase of $0.6 billion in long-term debt (including securities due within one year) primarily due to the issuance of senior notes and revenue bonds;
a decrease of $0.4 billion in deferred credits related to income taxes primarily due to the flowback of excess deferred income taxes;
a decrease of $0.4 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Alabama Power" herein; and
a decrease of $0.2 billion in other regulatory assets, deferred primarily due to a decrease in deferred under recovered fuel costs.
See "Financing Activities – Alabama Power" herein and Notes 2, 5, and 8 to the financial statements for additional information.
Georgia Power
Significant balance sheet changes in 2023 for Georgia Power included:
an increase of $3.5 billion in total property, plant, and equipment primarily related to the construction of generation, transmission, and distribution facilities, including $1.2 billion for Plant Vogtle Units 3 and 4;
an increase of $2.5 billion in common stockholder's equity primarily due to capital contributions from Southern Company and net income, partially offset by dividends paid to Southern Company;
an increase of $1.8 billion in long-term debt (including securities due within one year) primarily due to net issuances of senior notes;
decreases of $0.4 billion in AROs and $0.3 billion in regulatory assets associated with AROs primarily due to cost estimate updates for ash pond closures;
a decrease of $0.4 billion in cash and cash equivalents, as discussed further under "Analysis of Cash Flows – Georgia Power" herein;
an increase of $0.3 billion in accumulated deferred income taxes primarily due to an increase in property-related timing differences; and
a decrease of $0.3 billion in notes payable primarily due to net repayments of short-term bank debt, largely offset by an increase in commercial paper borrowings.
See "Financing Activities – Georgia Power" herein and Notes 2, 5, 6,8, and 10 to the financial statements for additional information.
Mississippi Power
Significant balance sheet changes in 2023 for Mississippi Power included:
an increase of $161 million in total property, plant, and equipment primarily related to the construction of generation, transmission, and distribution facilities;
an increase of $99 million in long-term debt (including securities due within one year) primarily due to issuances of senior notes;
an increase of $72 million in common stockholder's equity related to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company; and
a decrease of $53 million in affiliated receivables primarily due to a decrease in power pool sales.
See "Financing Activities – Mississippi Power" herein and Notes 5 and 8 to the financial statements for additional information.
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Southern Power
Significant balance sheet changes in 2023 for Southern Power included:
an increase of $335 million in accumulated deferred income taxes primarily related to the expected utilization of ITCs;
a decrease of $268 million in long-term debt (including securities due within one year) primarily due to the repayment of senior notes at maturity;
a decrease of $218 million in total stockholder's equity primarily due to dividends paid to Southern Company and net distributions to noncontrolling interests, partially offset by net income and capital contributions from Southern Company; and
a decrease of $189 million in total property, plant, and equipment in service primarily due to continued depreciation of assets, partially offset by an increase in construction work in progress primarily related to the acquisition of the South Cheyenne and Millers Branch solar facilities.
See "Financing Activities – Southern Power" herein and Notes 5, 8, and 15 to the financial statements for additional information.
Southern Company Gas
Significant balance sheet changes in 2023 for Southern Company Gas included:
an increase of $1.1 billion in total property, plant, and equipment primarily related to the construction of transportation and distribution assets and additional infrastructure investment;
a decrease of $0.4 billion in total accounts receivable primarily relating to decreases of $0.2 billion in customer accounts receivable and $0.2 billion in unbilled revenues as a result of seasonality;
an increase of $0.4 billion in common stockholder's equity related to net income and capital contributions from Southern Company, partially offset by dividends paid to Southern Company;
an increase of $0.4 billion in long-term debt (including securities due within one year) due to issuances of senior notes and first mortgage bonds;
a decrease of $0.4 billion in notes payable due to repayments of short-term debt and commercial paper borrowings;
a decrease of $0.3 billion in other accounts payable due to the timing of vendor payments; and
an increase of $0.2 billion in natural gas cost over recovery primarily due to lower natural gas prices and the timing of natural gas purchases.
See "Financing Activities – Southern Company Gas" herein and Notes 2, 5, and 8 to the financial statements for additional information.
Financing Activities
The following table outlines the Registrants' long-term debt financing activities for the year ended December 31, 2023:
Issuances and ReofferingsMaturities and Redemptions
CompanySenior NotesRevenue
Bonds
Other Long-Term DebtSenior
Notes
Revenue Bonds
Other Long-Term Debt(a)
(in millions)
Southern Company parent$4,525 $— $— $1,850 $— $550 
Alabama Power500 326 29 300 — 
Georgia Power2,450 229 — 800 — 102 
Mississippi Power100 — — — — 
Southern Power— — — 290 — — 
Southern Company Gas500 — 312 350 — 50 
Other— — — — — 
Elimination(b)
— — — — — (9)
Southern Company$8,075 $555 $341 $3,590 $— $704 
(a)Includes reductions in finance lease obligations resulting from cash payments under finance leases and, for Georgia Power, principal amortization payments totaling $86 million for FFB borrowings. See Note 8 to the financial statements under "Long-term Debt – DOE Loan Guarantee Borrowings" for additional information.
(b)Represents reductions in affiliate finance lease obligations at Georgia Power, which are eliminated in Southern Company's consolidated financial statements.
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Except as otherwise described herein, the Registrants used the proceeds of debt issuances for their redemptions and maturities shown in the table above, to repay short-term indebtedness, and for general corporate purposes, including working capital. The Subsidiary Registrants also used the proceeds for their construction programs.
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Registrants plan to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Southern Company
During 2023, Southern Company issued approximately 2.1 million shares of common stock primarily through equity compensation plans and received proceeds of approximately $36 million.
In January 2023, Southern Company redeemed all $550 million aggregate principal amount of its Series 2016B Junior Subordinated Notes due March 15, 2057.
In February 2023, Southern Company issued $1.5 billion aggregate principal amount of its Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes) in a private offering. In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option. See Note 8 to the financial statements under "Convertible Senior Notes" for additional information.
In May 2023, Southern Company repaid at maturity $600 million aggregate principal amount of its 2021C Floating Rate Senior Notes.
Also in May 2023, Southern Company issued $750 million aggregate principal amount of Series 2023B 4.85% Senior Notes due June 15, 2028 and $750 million aggregate principal amount of Series 2023C 5.20% Senior Notes due June 15, 2033.
In July 2023, Southern Company repaid at maturity $1.25 billion aggregate principal amount of its 2.95% Senior Notes.
In September 2023, Southern Company issued $600 million aggregate principal amount of Series 2023D 5.50% Senior Notes due March 15, 2029 and $700 million aggregate principal amount of Series 2023E 5.70% Senior Notes due March 15, 2034.
Alabama Power
During 2023, a subsidiary of Alabama Power borrowed $20 million under a $39 million long-term floating rate bank loan entered into in December 2022 with a maturity date of December 12, 2029.
In May 2023, Alabama Power issued $200 million aggregate principal amount of Series 2023A Floating Rate Senior Notes due May 15, 2073.
In August 2023, the Walker County Economic and Industrial Development Authority issued for the benefit of Alabama Power $228 million aggregate principal amount of Solid Waste Disposal Revenue Bonds (Alabama Power Company Plant Gorgas Project), First Series 2023 ($140 million aggregate principal amount) and Second Series 2023 ($88 million aggregate principal amount) due August 1, 2063. The proceeds from the revenue bonds are being used to finance certain solid waste disposal facilities at Plant Gorgas.
Also in August 2023, the Industrial Development Board of the Town of West Jefferson issued for the benefit of Alabama Power $98 million aggregate principal amount of Solid Waste Disposal Revenue Bonds (Alabama Power Company Plant Miller Project), Series 2023 due August 1, 2063. The proceeds from the revenue bonds are being used to finance certain solid waste disposal facilities at Plant Miller.
In September 2023, a subsidiary of Alabama Power assumed two fixed rate bank loans totaling $9 million, which it repaid in December 2023 using approximately $9 million of borrowings under a new $20 million fixed rate bank loan maturing December 2030.
In November 2023, Alabama Power issued $300 million aggregate principal amount of Series 2023B 5.85% Senior Notes due November 15, 2033.
In December 2023, Alabama Power repaid at maturity $300 million aggregate principal amount of its Series 2013A 3.55% Senior Notes.
Subsequent to December 31, 2023, Alabama Power received a capital contribution of $425 million from Southern Company and also repaid at maturity approximately $21 million aggregate principal amount of Industrial Development Board of the Town of Wilsonville (Alabama) Pollution Control Revenue Bonds (Alabama Power Company Gaston Plant Project), Series D.
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Georgia Power
In March 2023, Georgia Power reoffered to the public the following pollution control revenue bonds that previously had been purchased and were held by Georgia Power at December 31, 2022:
approximately $28 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), Second Series 2006;
approximately $89 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), Second Series 2009;
approximately $49 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), First Series 2012;
approximately $18 million aggregate principal amount of Development Authority of Monroe County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Scherer Project), First Series 2013; and
$46 million aggregate principal amount of Development Authority of Burke County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Vogtle Project), First Series 1996.
Also in March 2023, Georgia Power borrowed $100 million pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand. In April 2023, Georgia Power borrowed an additional $150 million under the arrangement. In May 2023, Georgia Power repaid the aggregate $250 million outstanding.
Also in March 2023, Georgia Power repaid at maturity a $200 million short-term floating rate bank loan entered into in March 2022.
In April 2023, Georgia Power repaid at maturity $100 million aggregate principal amount of its Series N 5.750% Senior Notes.
Also in April 2023, Georgia Power repaid at maturity a $200 million short-term floating rate bank loan entered into in April 2022.
In May 2023, Georgia Power issued $750 million aggregate principal amount of Series 2023A 4.65% Senior Notes due May 16, 2028 and $1.0 billion aggregate principal amount of Series 2023B 4.95% Senior Notes due May 17, 2033.
In July 2023, Georgia Power repaid at maturity $700 million aggregate principal amount of its Series 2020A 2.10% Senior Notes.
In November 2023, Georgia Power issued $700 million aggregate principal amount of Series 2023C Floating Rate Senior Notes due May 8, 2025.
Also in November 2023, Georgia Power repaid $780 million of a $1.2 billion short-term floating rate bank loan entered into in November 2022 and extended the maturity of the remaining outstanding amount of $420 million to November 2024.
In December 2023 and subsequent to December 31, 2023, Georgia Power borrowed $100 million and $150 million, respectively, pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand.
Mississippi Power
In March 2023, Mississippi Power borrowed $50 million of short-term debt pursuant to its $125 million revolving credit arrangement, which it repaid in June 2023.
In June 2023, Mississippi Power issued in a private placement $65 million aggregate principal amount of Series 2023A 5.64% Senior Notes due July 15, 2026 and $35 million aggregate principal amount of Series 2023B 5.63% Senior Notes due July 15, 2033.
Southern Power
In January 2023, Southern Power borrowed $100 million pursuant to a short-term uncommitted bank credit arrangement bearing interest at a mutually agreed upon rate and payable on demand. During the second quarter 2023, Southern Power made net repayments of $50 million of the $100 million borrowed. In October 2023, Southern Power borrowed the remaining $50 million under the arrangement. In December 2023, Southern Power repaid the $100 million outstanding amount.
In September 2023, Southern Power repaid at maturity $290 million aggregate principal amount of its Series 2016C 2.75% Senior Notes.
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Southern Company Gas
In February 2023, Nicor Gas repaid its $150 million and $50 million short-term floating rate bank loans entered into in February 2022 and March 2022, respectively.
In July 2023, Nicor Gas issued in a private placement $50 million aggregate principal amount of 5.28% Series First Mortgage Bonds due July 31, 2030 and $75 million aggregate principal amount of 5.43% Series First Mortgage Bonds due July 31, 2035. In October 2023, pursuant to the same agreement, Nicor Gas issued in a private placement $75 million aggregate principal amount of 5.67% Series First Mortgage Bonds due October 31, 2053 and $75 million aggregate principal amount of 5.77% Series First Mortgage Bonds due October 31, 2063.
In September 2023, Southern Company Gas Capital issued $500 million aggregate principal amount of Series 2023A 5.75% Senior Notes due September 15, 2033, guaranteed by Southern Company Gas.
In October 2023, Southern Company Gas Capital repaid at maturity $350 million aggregate principal amount of its 2.450% Senior Notes.
In December 2023, Nicor Gas repaid at maturity $50 million aggregate principal amount of its 5.80% Series First Mortgage Bonds.
During 2023, Southern Company Gas received cash advances totaling $37 million under a long-term financing agreement related to a construction contract.
Credit Rating Risk
At December 31, 2023, the Registrants did not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change of certain Registrants to BBB and/or Baa2 or below. These contracts are primarily for physical electricity and natural gas purchases and sales, fuel purchases, fuel transportation and storage, energy price risk management, transmission, interest rate management, and, for Georgia Power, services at Plant Vogtle Units 3 and 4.
The maximum potential collateral requirements under these contracts at December 31, 2023 were as follows:
Credit Ratings
Southern Company(*)
Alabama PowerGeorgia PowerMississippi Power
Southern
Power(*)
Southern Company Gas
(in millions)
At BBB and/or Baa2$33 $$— $— $32 $— 
At BBB- and/or Baa3407 60 345 — 
At BB+ and/or Ba1 or below2,074 404 943 319 1,289 19 
(*)Southern Power has PPAs that could require collateral, but not accelerated payment, in the event of a downgrade of Southern Power's credit. The PPAs require credit assurances without stating a specific credit rating. The amount of collateral required would depend upon actual losses resulting from a credit downgrade. Southern Power had $106 million of cash collateral posted related to PPA requirements at December 31, 2023.
The amounts in the previous table for the traditional electric operating companies and Southern Power include certain agreements that could require collateral if either Alabama Power or Georgia Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Registrants to access capital markets and would be likely to impact the cost at which they do so.
Mississippi Power and its largest retail customer, Chevron Products Company (Chevron), have agreements under which Mississippi Power provides retail service to the Chevron refinery in Pascagoula, Mississippi through at least 2038. The agreements grant Chevron a security interest in the co-generation assets owned by Mississippi Power located at the refinery that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the three rating agencies.
On August 2, 2023, S&P revised its credit rating outlook for Southern Company and its subsidiaries to positive from stable.
On September 1, 2023, Fitch upgraded the senior unsecured long-term debt rating of Georgia Power to A- from BBB+ and revised the rating outlook to positive from stable.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Also on September 1, 2023, Fitch revised the ratings outlook of Southern Company, Alabama Power, Southern Power, Nicor Gas, and SEGCO to stable from negative.
On September 26, 2023, Moody's upgraded Mississippi Power's senior unsecured long-term debt rating to A3 from Baa1 and revised its rating outlook to stable from positive.
Also on September 26, 2023, Moody's revised its ratings outlooks for Southern Company and Georgia Power to positive from stable.
Market Price Risk
The Registrants had no material change in market risk exposure for the year ended December 31, 2023 when compared to the year ended December 31, 2022. See Note 14 to the financial statements for an in-depth discussion of the Registrants' derivatives, as well as Note 1 to the financial statements under "Financial Instruments" for additional information.
Due to cost-based rate regulation and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities that sell natural gas directly to end-use customers continue to have limited exposure to market volatility in interest rates, foreign currency exchange rates, commodity fuel prices, and prices of electricity. The traditional electric operating companies and certain of the natural gas distribution utilities manage fuel-hedging programs implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies to hedge the impact of market fluctuations in natural gas prices for customers. Mississippi Power also manages wholesale fuel-hedging programs under agreements with its wholesale customers. Because energy from Southern Power's facilities is primarily sold under long-term PPAs with tolling agreements and provisions shifting substantially all of the responsibility for fuel cost to the counterparties, Southern Power's exposure to market volatility in commodity fuel prices and prices of electricity is generally limited. However, Southern Power has been and may continue to be exposed to market volatility in energy-related commodity prices as a result of uncontracted generating capacity. To mitigate residual risks relative to movements in electricity prices, the traditional electric operating companies and Southern Power may enter into physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market and, to a lesser extent, financial hedge contracts for natural gas purchases; however, a significant portion of contracts are priced at market.
Certain of Southern Company Gas' non-regulated operations routinely utilize various types of derivative instruments to economically hedge certain commodity price and weather risks inherent in the natural gas industry. These instruments include a variety of exchange-traded and OTC energy contracts, such as forward contracts, futures contracts, options contracts, and swap agreements. Southern Company Gas' gas marketing services business also actively manages storage positions through a variety of hedging transactions for the purpose of managing exposures arising from changing natural gas prices. These hedging instruments are used to substantially protect economic margins (as spreads between wholesale and retail natural gas prices widen between periods) and thereby minimize exposure to declining earnings. Some of these economic hedge activities may not qualify, or may not be designated, for hedge accounting treatment.
The following table provides information related to variable interest rate exposure on long-term debt (including amounts due within one year) at December 31, 2023 for the applicable Registrants:
At December 31, 2023
Southern Company(*)
Alabama
Power
Georgia
Power
Mississippi
Power
Southern Company
Gas
(in millions, except percentages)
Long-term variable interest rate exposure$5,290 $1,083 $1,939 $269 $500 
Weighted average interest rate on long-term variable interest rate exposure5.87 %4.75 %5.48 %5.39 %5.85 %
Impact on annualized interest expense of 100 basis point change in interest rates$53 $11 $19 $$
(*)Includes $1.4 billion of long-term variable interest rate exposure at the Southern Company parent entity.
The Registrants may enter into interest rate derivatives designated as hedges, which are intended to mitigate interest rate volatility related to forecasted debt financings and existing fixed and floating rate obligations. See Note 14 to the financial statements under "Interest Rate Derivatives" for additional information.
Southern Company and Southern Power had foreign currency denominated debt at December 31, 2023 and have each mitigated exposure to foreign currency exchange rate risk through the use of foreign currency swaps. See Note 14 to the financial statements under "Foreign Currency Derivatives" for additional information.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Changes in fair value of energy-related derivative contracts for Southern Company and Southern Company Gas for the years ended December 31, 2023 and 2022 are provided in the table below. At December 31, 2023 and 2022, substantially all of the traditional electric operating companies' and certain of the natural gas distribution utilities' energy-related derivative contracts were designated as regulatory hedges and were related to the applicable company's fuel-hedging program.
Southern Company(a)
Southern Company Gas(a)
(in millions)
Contracts outstanding at December 31, 2021, assets (liabilities), net$174 $8 
Contracts realized or settled(327)10 
Current period changes(b)
142 (55)
Contracts outstanding at December 31, 2022, assets (liabilities), net$(11)$(37)
Contracts realized or settled207 33 
Current period changes(b)
(500)(45)
Contracts outstanding at December 31, 2023, assets (liabilities), net$(304)$(49)
(a)Excludes cash collateral held on deposit in broker margin accounts of $62 million, $41 million, and $3 million at December 31, 2023, 2022, and 2021, respectively, and immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
(b)The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
The net hedge volumes of energy-related derivative contracts for natural gas purchased (sold) at December 31, 2023 and 2022 for Southern Company and Southern Company Gas were as follows:
Southern CompanySouthern Company Gas
mmBtu Volume (in millions)
At December 31, 2023:
Commodity – Natural gas swaps109 — 
Commodity – Natural gas options339 102 
Total hedge volume448 102 
At December 31, 2022:
Commodity – Natural gas swaps217 — 
Commodity – Natural gas options214 93 
Total hedge volume431 93 
Southern Company Gas' derivative contracts are comprised of both long and short natural gas positions. A long position is a contract to purchase natural gas, and a short position is a contract to sell natural gas. The volumes presented above for Southern Company Gas represent the net of long natural gas positions of 112 million mmBtu and short natural gas positions of 10 millionmmBtu at December 31, 2023 and the net of long natural gas positions of 98 million mmBtu and short natural gas positions of 5 million mmBtu at December 31, 2022.
For the Southern Company system, the weighted average swap contract cost per mmBtu was approximately $0.76 per mmBtu below market prices at December 31, 2023 and was approximately $0.08 per mmBtu above market prices at December 31, 2022. The change in option fair value is primarily attributable to the volatility of the market and the underlying change in the natural gas price. Substantially all of the traditional electric operating companies' natural gas hedge gains and losses are recovered through their respective fuel cost recovery clauses.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
The Registrants use over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. In addition, Southern Company Gas uses exchange-traded market-observable contracts, which are categorized as Level 1. See Note 13 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts for Southern Company and Southern Company Gas at December 31, 2023 were as follows:
Fair Value Measurements of Contracts at
December 31, 2023
Total
Fair Value
Maturity
20242025 – 20262027 – 2028Thereafter
(in millions)
Southern Company
Level 1(a)
$(40)$(36)$(4)$— $— 
Level 2(b)
(264)(180)(87)
Southern Company total(c)
$(304)$(216)$(91)$$
Southern Company Gas
Level 1(a)
$(40)$(36)$(4)$— $— 
Level 2(b)
(9)(8)(1)— — 
Southern Company Gas total(c)
$(49)$(44)$(5)$— $— 
(a)Valued using NYMEX futures prices.
(b)Level 2 amounts for Southern Company Gas are valued using basis transactions that represent the cost to transport natural gas from a NYMEX delivery point to the contract delivery point. These transactions are based on quotes obtained either through electronic trading platforms or directly from brokers.
(c)Excludes cash collateral of $62 million as well as immaterial premium and associated intrinsic value associated with weather derivatives.
The Registrants are exposed to risk in the event of nonperformance by counterparties to energy-related and interest rate derivative contracts, as applicable. The Registrants only enter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P, or with counterparties who have posted collateral to cover potential credit exposure. Therefore, the Registrants do not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 14 to the financial statements.
Credit Risk
Southern Company (except as discussed herein), the traditional electric operating companies, and Southern Power are not exposed to any concentrations of credit risk. Southern Company Gas' exposure to concentrations of credit risk is discussed herein.
Southern Company Gas
Gas Distribution Operations
Concentration of credit risk occurs at Atlanta Gas Light for amounts billed for services and other costs to its customers, which consist of the 13 Marketers in Georgia. The credit risk exposure to the Marketers varies seasonally, with the lowest exposure in the non-peak summer months and the highest exposure in the peak winter months. Marketers are responsible for the retail sale of natural gas to end-use customers in Georgia. The provisions of Atlanta Gas Light's tariff allow Atlanta Gas Light to obtain credit security support in an amount equal to a minimum of two times a Marketer's highest month's estimated bill from Atlanta Gas Light. For 2023, the four largest Marketers based on customer count, which includes SouthStar, accounted for 18% of Southern Company Gas' operating revenues and 20% of operating revenues for Southern Company Gas' gas distribution operations segment.
Several factors are designed to mitigate Southern Company Gas' risks from the increased concentration of credit that has resulted from deregulation. In addition to the security support described above, Atlanta Gas Light bills intrastate delivery service to Marketers in advance rather than in arrears. Atlanta Gas Light accepts credit support in the form of cash deposits, letters of credit/surety bonds from acceptable issuers, and corporate guarantees from investment-grade entities. Southern Company Gas reviews the adequacy of credit support coverage, credit rating profiles of credit support providers, and payment status of each Marketer. Southern Company Gas believes that adequate policies and procedures are in place to properly quantify, manage, and report on Atlanta Gas Light's credit risk exposure to Marketers.
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COMBINED MANAGEMENT'S DISCUSSION AND ANALYSIS
Atlanta Gas Light also faces potential credit risk in connection with assignments of interstate pipeline transportation and storage capacity to Marketers. Although Atlanta Gas Light assigns this capacity to Marketers, in the event that a Marketer fails to pay the interstate pipelines for the capacity, the interstate pipelines would likely seek repayment from Atlanta Gas Light.
Gas Marketing Services
Southern Company Gas obtains credit scores for its firm residential and small commercial customers using a national credit reporting agency, enrolling only those customers that meet or exceed Southern Company Gas' credit threshold. Southern Company Gas considers potential interruptible and large commercial customers based on reviews of publicly available financial statements and commercially available credit reports. Prior to entering into a physical transaction, Southern Company Gas also assigns physical wholesale counterparties an internal credit rating and credit limit based on the counterparties' Moody's, S&P, and Fitch ratings, commercially available credit reports, and audited financial statements.
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Item 8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholders and the Board of Directors of The Southern Company and Subsidiary Companies
Opinions on the Financial Statements and Internal Control over Financial Reporting
We have audited the accompanying consolidated balance sheets of The Southern Company and Subsidiary Companies (Southern Company) as of December 31, 2023 and 2022, the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2023, the related notes, and the financial statement schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). We also have audited Southern Company's internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).
In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Southern Company as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, Southern Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control – Integrated Framework (2013) issued by COSO.
Basis for Opinions
Southern Company's management is responsible for these financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on these financial statements and an opinion on Southern Company's internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to Southern Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.
Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures to respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.
Definition and Limitations of Internal Control over Financial Reporting
A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the Audit Committee of Southern Company's Board of Directors and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved especially challenging, subjective,
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or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Impact of Rate Regulation on the Financial Statements – Refer to Note 1 (Summary of Significant Accounting Policies – Regulatory Assets and Liabilities) and Note 2 (Regulatory Matters) to the financial statements
Critical Audit Matter Description
Southern Company's traditional electric operating companies and natural gas distribution utilities (the "regulated utility subsidiaries") are subject to rate regulation by their respective state Public Service Commissions or other applicable state regulatory agencies and wholesale regulation by the Federal Energy Regulatory Commission (collectively, the "Commissions"). Management has determined that the regulated utility subsidiaries meet the requirements under accounting principles generally accepted in the United States of America to utilize specialized rules to account for the effects of rate regulation in the preparation of its financial statements. Accounting for the economics of rate regulation may impact multiple financial statement line items and disclosures.
The Commissions set the rates the regulated utility subsidiaries are permitted to charge customers. Rates are determined and approved in regulatory proceedings based on an analysis of the applicable regulated utility subsidiary's costs to provide utility service and a return on, and recovery of, its investment in the utility business. Current and future regulatory decisions can have an impact on the recovery of costs, the rate of return earned on investments, and the timing and amount of assets to be recovered through rates. The Commissions' regulation of rates is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital. While Southern Company's regulated utility subsidiaries expect to recover costs from customers through regulated rates, there is a risk that the Commissions will not approve: (1) full recovery of the costs of providing utility service, or (2) full recovery of all amounts invested in the utility business and a reasonable return on those investments.
We identified the impact of rate regulation related to certain assets and liabilities as a critical audit matter due to the significant judgments made by management to support its assertions about impacted account balances and disclosures and/or the high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs. Management judgments include assessing the likelihood of (1) recovery in future rates of incurred costs, (2) a disallowance of part of the cost of recently completed plant or plant under construction, and/or (3) a refund to customers. Auditing these judgments, which include assumptions about the outcome of future decisions by the Commissions, required specialized knowledge of accounting for rate regulations and the rate setting process due to its inherent complexities.
How the Critical Audit Matter Was Addressed in the Audit
Our audit procedures related to the impact of rate regulation on certain assets and liabilities included the following, among others:
We tested the effectiveness of management's controls over the evaluation of the likelihood of (1) the recovery in future rates of certain incurred costs and (2) refunds or future reductions in rates that should be reported as regulatory liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering certain costs in future rates or of a future reduction in rates. We also tested the effectiveness of management's controls over the initial recognition of regulatory assets or liabilities.
We read and evaluated relevant regulatory orders and/or other relevant publicly available information to assess the likelihood of recovery of certain incurred costs in future rates or of a future reduction in rates based on precedents of the treatment of similar costs under similar circumstances.
We tested certain incurred costs recorded as regulatory assets or liabilities during the period for completeness and accuracy.
We obtained representation from management regarding the likelihood of recoverability of incurred costs and potential refund or future reduction in rates to assess management's assertions about the likelihood of recovery, refund, or a future reduction in rates.
We evaluated Southern Company's disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, including where there is a high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 14, 2024
We have served as Southern Company's auditor since 2002.
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CONSOLIDATED STATEMENTS OF INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company and Subsidiary Companies

202320222021
(in millions)
Operating Revenues:
Retail electric revenues$16,343 $18,197 $14,852 
Wholesale electric revenues2,467 3,641 2,455 
Other electric revenues792 747 718 
Natural gas revenues4,702 5,962 4,380 
Other revenues949 732 708 
Total operating revenues25,253 29,279 23,113 
Operating Expenses:
Fuel4,365 6,835 4,010 
Purchased power883 1,593 978 
Cost of natural gas1,644 3,004 1,619 
Cost of other sales560 396 357 
Other operations and maintenance6,093 6,573 5,902 
Depreciation and amortization4,525 3,663 3,565 
Taxes other than income taxes1,425 1,411 1,290 
Estimated loss on Plant Vogtle Units 3 and 4(68)183 1,692 
Impairment charges 251 
Total operating expenses19,427 23,909 19,415 
Operating Income5,826 5,370 3,698 
Other Income and (Expense):
Allowance for equity funds used during construction268 224 190 
Earnings from equity method investments144 151 76 
Interest expense, net of amounts capitalized(2,446)(2,022)(1,837)
Other income (expense), net553 500 449 
Total other income and (expense)(1,481)(1,147)(1,122)
Earnings Before Income Taxes4,345 4,223 2,576 
Income taxes496 795 267 
Consolidated Net Income3,849 3,428 2,309 
Dividends on preferred stock of subsidiaries 11 15 
Net loss attributable to noncontrolling interests(127)(107)(99)
Consolidated Net Income Attributable to Southern Company$3,976 $3,524 $2,393 
Common Stock Data:
Earnings per share —
Basic$3.64 $3.28 $2.26 
Diluted3.62 3.26 2.24 
Average number of shares of common stock outstanding — (in millions)
Basic1,092 1,075 1,061 
Diluted1,098 1,081 1,068 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company and Subsidiary Companies
202320222021
(in millions)
Consolidated Net Income$3,849 $3,428 $2,309 
Other comprehensive income (loss):
Qualifying hedges:
Changes in fair value, net of tax of
   $(17), $(19), and $(16), respectively
(41)(60)(49)
Reclassification adjustment for amounts included in net income,
   net of tax of $27, $23, and $31, respectively
69 73 96 
Pension and other postretirement benefit plans:
Benefit plan net gain (loss),
   net of tax of $(14), $18, and $37, respectively
(39)48 98 
Reclassification adjustment for amounts included in net income,
   net of tax of $—, $3, and $5, respectively
1 10 13 
Total other comprehensive income (loss)(10)71 158 
Dividends on preferred stock of subsidiaries 11 15 
Comprehensive loss attributable to noncontrolling interests(127)(107)(99)
Consolidated Comprehensive Income Attributable to Southern Company$3,966 $3,595 $2,551 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company and Subsidiary Companies
 202320222021
 (in millions)
Operating Activities:
Consolidated net income$3,849 $3,428 $2,309 
Adjustments to reconcile consolidated net income
   to net cash provided from operating activities —
Depreciation and amortization, total4,986 4,064 3,973 
Deferred income taxes63 670 (49)
Utilization of federal investment tax credits353 88 288 
Allowance for equity funds used during construction(268)(224)(190)
Pension, postretirement, and other employee benefits(527)(436)(305)
Settlement of asset retirement obligations(617)(455)(456)
Storm damage and reliability reserve accruals124 430 288 
Stock based compensation expense137 127 144 
Estimated loss on Plant Vogtle Units 3 and 4(68)183 1,692 
Impairment charges 251 91 
Retail fuel cost under recovery – long-term(206)(2,166)(536)
Natural gas cost under recovery – long-term 207 (207)
Other, net(138)(25)(89)
Changes in certain current assets and liabilities —
-Receivables482 (771)(77)
-Retail fuel cost under recovery686 (100)(4)
-Fossil fuel for generation(368)(125)99 
-Materials and supplies(345)(160)(130)
-Natural gas cost under recovery108 158 (266)
-Other current assets(106)(186)(270)
-Accounts payable(863)1,021 (8)
-Customer refunds(157)119 130 
-Natural gas cost over recovery214 — — 
-Other current liabilities214 204 (258)
Net cash provided from operating activities7,553 6,302 6,169 
Investing Activities:
Property additions(9,095)(7,923)(7,586)
Nuclear decommissioning trust fund purchases(1,142)(1,125)(1,598)
Nuclear decommissioning trust fund sales1,121 1,112 1,593 
Proceeds from dispositions164 275 917 
Cost of removal, net of salvage(592)(649)(442)
Change in construction payables, net18 203 (124)
Payments pursuant to LTSAs(99)(190)(188)
Other investing activities(43)(133)75 
Net cash used for investing activities(9,668)(8,430)(7,353)
Financing Activities:
Increase (decrease) in notes payable, net973 (337)530 
Proceeds —
Long-term debt8,972 5,132 8,262 
Short-term borrowings350 2,650 325 
Common stock36 1,808 73 
Redemptions and repurchases —
Long-term debt(4,294)(2,158)(4,327)
Short-term borrowings(1,630)(1,150)(25)
Preferred stock (298)— 
Capital contributions from noncontrolling interests21 73 501 
Distributions to noncontrolling interests(234)(259)(351)
Payment of common stock dividends(3,035)(2,907)(2,777)
Other financing activities(160)(218)(266)
Net cash provided from financing activities999 2,336 1,945 
Net Change in Cash, Cash Equivalents, and Restricted Cash(1,116)208 761 
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year2,037 1,829 1,068 
Cash, Cash Equivalents, and Restricted Cash at End of Year$921 $2,037 $1,829 
Supplemental Cash Flow Information:
Cash paid during the period for —
Interest (net of $132, $103, and $92 capitalized, respectively)$2,184 $1,758 $1,718 
Income taxes, net132 146 93 
Noncash transactions —
Accrued property additions at year-end1,027 1,024 866 
LTSA credits utilized from the sale of spare parts23 — — 
Contributions from noncontrolling interests 15 89 
Contributions of wind turbine equipment — 82 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2023 and 2022
Southern Company and Subsidiary Companies
Assets20232022
(in millions)
Current Assets:
Cash and cash equivalents$748 $1,917 
Receivables —
Customer accounts2,030 2,128 
Unbilled revenues786 1,012 
Under recovered fuel clause revenues696 10 
Other accounts and notes519 637 
Accumulated provision for uncollectible accounts(68)(71)
Materials and supplies1,989 1,664 
Fossil fuel for generation943 575 
Natural gas for sale420 438 
Prepaid expenses406 347 
Assets from risk management activities, net of collateral36 115 
Regulatory assets – asset retirement obligations274 332 
Natural gas cost under recovery 108 
Other regulatory assets1,120 860 
Other current assets533 344 
Total current assets10,432 10,416 
Property, Plant, and Equipment:
In service128,428 117,529 
Less: Accumulated depreciation37,725 35,297 
Plant in service, net of depreciation90,703 82,232 
Other utility plant, net499 599 
Nuclear fuel, at amortized cost858 843 
Construction work in progress7,784 10,896 
Total property, plant, and equipment99,844 94,570 
Other Property and Investments:
Goodwill5,161 5,161 
Nuclear decommissioning trusts, at fair value2,424 2,145 
Equity investments in unconsolidated subsidiaries1,368 1,443 
Other intangible assets, net of amortization of $376 and $340, respectively368 406 
Miscellaneous property and investments665 602 
Total other property and investments9,986 9,757 
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization1,432 1,531 
Deferred charges related to income taxes886 866 
Prepaid pension costs2,079 2,290 
Unamortized loss on reacquired debt220 238 
Deferred under recovered retail fuel clause revenues1,261 2,056 
Regulatory assets – asset retirement obligations, deferred5,459 5,764 
Other regulatory assets, deferred6,264 5,918 
Other deferred charges and assets1,468 1,485 
Total deferred charges and other assets19,069 20,148 
Total Assets$139,331 $134,891 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2023 and 2022
Southern Company and Subsidiary Companies
Liabilities and Stockholders' Equity20232022
(in millions)
Current Liabilities:
Securities due within one year$2,476 $4,285 
Notes payable2,314 2,609 
Accounts payable2,898 3,525 
Customer deposits503 502 
Accrued taxes —
Accrued income taxes8 60 
Other accrued taxes860 764 
Accrued interest652 614 
Accrued compensation1,151 1,127 
Asset retirement obligations744 694 
Liabilities from risk management activities, net of collateral294 178 
Operating lease obligations183 197 
Natural gas cost over recovery214 — 
Other regulatory liabilities141 382 
Other current liabilities1,029 787 
Total current liabilities13,467 15,724 
Long-Term Debt57,210 50,656 
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes10,990 10,036 
Deferred credits related to income taxes4,674 5,235 
Accumulated deferred ITCs2,067 2,133 
Employee benefit obligations1,115 1,238 
Operating lease obligations, deferred1,307 1,388 
Asset retirement obligations, deferred9,573 10,146 
Other cost of removal obligations1,957 1,903 
Other regulatory liabilities, deferred715 733 
Other deferred credits and liabilities1,031 1,167 
Total deferred credits and other liabilities33,429 33,979 
Total Liabilities104,106 100,359 
Common Stockholders' Equity:
Common stock, par value $5 per share (Authorized - 1.5 billion shares)5,423 5,417 
    (Issued - 1.1 billion shares; Treasury - 1.0 million shares)
Paid-in capital13,775 13,673 
Treasury, at cost(59)(53)
Retained earnings12,482 11,538 
Accumulated other comprehensive loss(177)(167)
Total common stockholders' equity31,444 30,408 
Noncontrolling interests3,781 4,124 
Total Stockholders' Equity (See accompanying statements)
35,225 34,532 
Total Liabilities and Stockholders' Equity$139,331 $134,891 
Commitments and Contingent Matters (See notes)
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company and Subsidiary Companies
Southern Company Common Stockholders' Equity
Number of Common SharesCommon StockAccumulated
Other
Comprehensive Income
(Loss)
Noncontrolling
Interests
 
IssuedTreasuryPar ValuePaid-In CapitalTreasuryRetained EarningsTotal
(in millions)
Balance at December 31, 20201,058 (1)$5,268 $11,834 $(46)$11,311 $(395)$4,262 $32,234 
Consolidated net income (loss)— — — — — 2,393 — (99)2,294 
Other comprehensive income— — — — — — 158 — 158 
Stock issued— 11 62 — — — — 73 
Stock-based compensation— — — 62 — — — — 62 
Cash dividends of $2.6200 per share— — — — — (2,777)— — (2,777)
Capital contributions from
   noncontrolling interests
— — — — — — — 590 590 
Distributions to
   noncontrolling interests
— — — — — — — (351)(351)
Other— — — (8)(1)— — (7)
Balance at December 31, 20211,061 (1)5,279 11,950 (47)10,929 (237)4,402 32,276 
Consolidated net income (loss)— — — — — 3,524 — (107)3,417 
Other comprehensive income— — — — — — 71 — 71 
Stock issued29 — 138 1,670 — — — — 1,808 
Stock-based compensation— — — 44 — — — — 44 
Cash dividends of $2.7000 per share— — — — — (2,907)— — (2,907)
Capital contributions from
   noncontrolling interests
— — — — — — — 88 88 
Distributions to
   noncontrolling interests
— — — — — — — (259)(259)
Other— — — (6)(8)(1)— (6)
Balance at December 31, 20221,090 (1)5,417 13,673 (53)11,538 (167)4,124 34,532 
Consolidated net income (loss)     3,976  (127)3,849 
Other comprehensive income (loss)      (10) (10)
Stock issued2  6 30     36 
Stock-based compensation   73     73 
Cash dividends of $2.7800 per share     (3,035)  (3,035)
Capital contributions from
   noncontrolling interests
       21 21 
Distributions to
   noncontrolling interests
       (236)(236)
Other   (1)(6)3  (1)(5)
Balance at December 31, 20231,092 (1)$5,423 $13,775 $(59)$12,482 $(177)$3,781 $35,225 
The accompanying notes are an integral part of these consolidated financial statements.
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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholders and the Board of Directors of Alabama Power Company
Opinion on the Financial Statements
We have audited the accompanying balance sheets of Alabama Power Company (Alabama Power) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2023 and 2022, the related statements of income, comprehensive income, common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2023, the related notes, and the financial statement schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of Alabama Power as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of Alabama Power's management. Our responsibility is to express an opinion on Alabama Power's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to Alabama Power in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Alabama Power is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of Alabama Power's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the Audit Committee of Southern Company's Board of Directors and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Impact of Rate Regulation on the Financial Statements – Refer to Note 1 (Summary of Significant Accounting Policies – Regulatory Assets and Liabilities) and Note 2 (Regulatory Matters – Alabama Power) to the financial statements
Critical Audit Matter Description
Alabama Power is subject to retail rate regulation by the Alabama Public Service Commission and wholesale regulation by the Federal Energy Regulatory Commission (collectively, the "Commissions"). Management has determined that it meets the requirements under accounting principles generally accepted in the United States of America to utilize specialized rules to account for the effects of rate regulation in the preparation of its financial statements. Accounting for the economics of rate regulation may impact multiple financial statement line items and disclosures.
The Commissions set the rates Alabama Power is permitted to charge customers. Rates are determined and approved in regulatory proceedings based on an analysis of Alabama Power's costs to provide utility service and a return on, and recovery of, its investment in the utility business. Current and future regulatory decisions can have an impact on the recovery of costs, the rate of return earned on investments, and the timing and amount of assets to be recovered through rates. The Commissions' regulation of rates is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital. While Alabama Power expects to recover costs from customers through regulated rates, there is a risk that the Commissions will not approve: (1) full recovery of the costs of providing utility service, or (2) full recovery of all amounts invested in the utility business and a reasonable return on those investments.
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We identified the impact of rate regulation related to certain assets and liabilities as a critical audit matter due to the significant judgments made by management to support its assertions about impacted account balances and disclosures and/or the high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs. Management judgments include assessing the likelihood of (1) recovery in future rates of incurred costs, (2) a disallowance of part of the cost of recently completed plant or plant under construction, and/or (3) a refund to customers. Auditing these judgments, which include assumptions about the outcome of future decisions by the Commissions, required specialized knowledge of accounting for rate regulations and the rate setting process due to its inherent complexities.
How the Critical Audit Matter Was Addressed in the Audit
Our audit procedures related to the impact of rate regulation on certain assets and liabilities included the following, among others:
We tested the effectiveness of management's controls over the evaluation of the likelihood of (1) the recovery in future rates of certain incurred costs and (2) refunds or future reductions in rates that should be reported as regulatory liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering certain costs in future rates or of a future reduction in rates. We also tested the effectiveness of management's controls over the initial recognition of regulatory assets or liabilities.
We read and evaluated relevant regulatory orders and/or other relevant publicly available information to assess the likelihood of recovery of certain incurred costs in future rates or of a future reduction in rates based on precedents of the treatment of similar costs under similar circumstances.
We tested certain incurred costs recorded as regulatory assets or liabilities during the period for completeness and accuracy.
We obtained representation from management regarding the likelihood of recoverability of incurred costs and potential refund or future reduction in rates to assess management's assertions about the likelihood of recovery, refund, or a future reduction in rates.
We evaluated Alabama Power's disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, including where there is a high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs.
/s/ Deloitte & Touche LLP
Birmingham, Alabama
February 14, 2024
We have served as Alabama Power's auditor since 2002.
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STATEMENTS OF INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Alabama Power Company 2017 Annual Report

Retail Regulatory Matters
202320222021
(in millions)
Operating Revenues:
Retail revenues$6,159 $6,470 $5,499 
Wholesale revenues, non-affiliates424 726 377 
Wholesale revenues, affiliates60 202 171 
Other revenues407 419 366 
Total operating revenues7,050 7,817 6,413 
Operating Expenses:
Fuel1,299 1,840 1,235 
Purchased power, non-affiliates253 441 221 
Purchased power, affiliates251 360 147 
Other operations and maintenance1,769 1,935 1,735 
Depreciation and amortization1,401 875 859 
Taxes other than income taxes442 424 410 
Total operating expenses5,415 5,875 4,607 
Operating Income1,635 1,942 1,806 
Other Income and (Expense):
Allowance for equity funds used during construction82 70 52 
Interest expense, net of amounts capitalized(425)(382)(340)
Other income (expense), net159 144 107 
Total other income and (expense)(184)(168)(181)
Earnings Before Income Taxes1,451 1,774 1,625 
Income taxes81 423 372 
Net Income1,370 1,351 1,253 
Dividends on Preferred Stock 11 15 
Net Income After Dividends on Preferred Stock$1,370 $1,340 $1,238 

STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Alabama Power Company

202320222021
(in millions)
Net Income$1,370 $1,351 $1,253 
Other comprehensive income:
Qualifying hedges:
Changes in fair value, net of tax of $—, $—, and $1, respectively (1)
Reclassification adjustment for amounts included in net income,
   net of tax of $1, $2, and $2, respectively
2 
Total other comprehensive income2 
Comprehensive Income$1,372 $1,355 $1,259 
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2023, 2022, and 2021
Alabama Power Company
 202320222021
 (in millions)
Operating Activities:
Net income$1,370 $1,351 $1,253 
Adjustments to reconcile net income
   to net cash provided from operating activities —
Depreciation and amortization, total1,554 1,014 1,005 
Deferred income taxes(242)355 245 
Allowance for equity funds used during construction(82)(70)(52)
Pension, postretirement, and other employee benefits(204)(118)(106)
Settlement of asset retirement obligations(270)(205)(202)
Natural disaster reserve and reliability reserve accruals70 185 75 
Retail fuel cost under recovery – long-term (520)(126)
Other, net4 (50)(53)
Changes in certain current assets and liabilities —
-Receivables(24)(321)42 
-Fossil fuel stock(165)(70)76 
-Materials and supplies(105)(7)(6)
-Retail fuel cost under recovery376 (102)— 
-Other current assets(20)(23)(31)
-Accounts payable(162)249 (109)
-Customer refunds(39)128 
-Other current liabilities18 (34)(86)
Net cash provided from operating activities2,079 1,639 2,053 
Investing Activities:
Property additions(2,022)(2,016)(1,753)
Nuclear decommissioning trust fund purchases(301)(355)(638)
Nuclear decommissioning trust fund sales300 354 637 
Cost of removal net of salvage(178)(234)(165)
Change in construction payables(44)50 (16)
Other investing activities49 (62)(26)
Net cash used for investing activities(2,196)(2,263)(1,961)
Financing Activities:
Increase in notes payable, net40 — — 
Proceeds —
Senior notes500 1,700 1,300 
Revenue bonds326 — — 
Other long-term debt29 — — 
Redemptions and repurchases —
Senior notes(300)(750)(200)
Preferred stock (298)— 
Revenue bonds — (65)
Other long-term debt — (206)
Capital contributions from parent company407 649 636 
Payment of common stock dividends(1,141)(1,016)(984)
Other financing activities(22)(34)(43)
Net cash provided from (used for) financing activities(161)251 438 
Net Change in Cash, Cash Equivalents, and Restricted Cash(278)(373)530 
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year687 1,060 530 
Cash, Cash Equivalents, and Restricted Cash at End of Year$409 $687 $1,060 
Supplemental Cash Flow Information:
Cash paid during the period for —
Interest (net of $27, $20, and $15 capitalized, respectively)$397 $342 $308 
Income taxes, net315 121 185 
Noncash transactions — Accrued property additions at year-end138 182 150 
The accompanying notes are an integral part of these financial statements.
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BALANCE SHEETS
At December 31, 2023 and 2022
Alabama Power Company
Assets20232022
(in millions)
Current Assets:
Cash and cash equivalents$324 $687 
Receivables —
Customer accounts513 431 
Unbilled revenues191 174 
Affiliated72 101 
Other accounts and notes109 153 
Accumulated provision for uncollectible accounts(16)(14)
Fossil fuel stock394 229 
Materials and supplies655 557 
Prepaid expenses62 65 
Regulatory assets – under recovered retail fuel clause revenues246 102 
Other regulatory assets385 372 
Other current assets142 67 
Total current assets3,077 2,924 
Property, Plant, and Equipment:
In service35,429 33,472 
Less: Accumulated provision for depreciation11,131 10,470 
Plant in service, net of depreciation24,298 23,002 
Other utility plant, net499 599 
Nuclear fuel, at amortized cost253 239 
Construction work in progress1,095 1,526 
Total property, plant, and equipment26,145 25,366 
Other Property and Investments:
Nuclear decommissioning trusts, at fair value1,261 1,127 
Equity investments in unconsolidated subsidiaries52 57 
Miscellaneous property and investments155 124 
Total other property and investments1,468 1,308 
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization87 71 
Deferred charges related to income taxes262 250 
Prepaid pension and other postretirement benefit costs659 657 
Regulatory assets – asset retirement obligations1,810 1,845 
Other regulatory assets, deferred1,858 2,107 
Other deferred charges and assets414 442 
Total deferred charges and other assets5,090 5,372 
Total Assets$35,780 $34,970 
The accompanying notes are an integral part of these financial statements.

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BALANCE SHEETS
At December 31, 2023 and 2022
Alabama Power Company
Liabilities and Stockholder's Equity20232022
(in millions)
Current Liabilities:
Securities due within one year$223 $301 
Notes payable40 — 
Accounts payable —
Affiliated330 443 
Other630 641 
Customer deposits105 106 
Accrued taxes51 57 
Accrued interest122 120 
Accrued compensation222 229 
Asset retirement obligations346 330 
Other regulatory liabilities44 96 
Other current liabilities191 91 
Total current liabilities2,304 2,414 
Long-Term Debt10,960 10,329 
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes4,170 3,981 
Deferred credits related to income taxes1,506 1,925 
Accumulated deferred ITCs74 81 
Employee benefit obligations155 145 
Operating lease obligations81 67 
Asset retirement obligations, deferred3,812 3,957 
Other regulatory liabilities, deferred291 315 
Other deferred credits and liabilities94 69 
Total deferred credits and other liabilities10,183 10,540 
Total Liabilities23,447 23,283 
Common Stockholder's Equity:
Common stock, par value $40 per share
    (Authorized - 40 million shares; Outstanding - 31 million shares)
1,222 1,222 
Paid-in capital7,125 6,710 
Retained earnings3,993 3,764 
Accumulated other comprehensive loss(7)(9)
Total common stockholder's equity (See accompanying statements)
12,333 11,687 
Total Liabilities and Stockholder's Equity$35,780 $34,970 
Commitments and Contingent Matters (See notes)
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2023, 2022, and 2021
Alabama Power Company

Number of
Common
Shares
Issued
Common
Stock
Paid-In
Capital
Retained
Earnings
Accumulated
Other
Comprehensive
Income (Loss)
Total
(in millions)
Balance at December 31, 202031 $1,222 $5,413 $3,194 $(19)$9,810 
Net income after dividends on
  preferred stock
— — — 1,238 — 1,238 
Capital contributions from parent company— — 643 — — 643 
Other comprehensive income— — — — 
Cash dividends on common stock— — — (984)— (984)
Balance at December 31, 202131 1,222 6,056 3,448 (13)10,713 
Net income after dividends on
  preferred stock
— — — 1,340 — 1,340 
Capital contributions from parent company— — 654 — — 654 
Other comprehensive income— — — — 
Cash dividends on common stock— — — (1,016)— (1,016)
Other— — — (8)— (8)
Balance at December 31, 202231 1,222 6,710 3,764 (9)11,687 
Net income after dividends on
  preferred stock
   1,370  1,370 
Capital contributions from parent company  415   415 
Other comprehensive income    2 2 
Cash dividends on common stock   (1,141) (1,141)
Balance at December 31, 202331 $1,222 $7,125 $3,993 $(7)$12,333 
The accompanying notes are an integral part of these financial statements.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Georgia Power Company
Opinion on the Financial Statements
We have audited the accompanying balance sheets of Georgia Power Company (Georgia Power) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2023 and 2022, the related statements of income, comprehensive income, common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2023, the related notes, and the financial statement schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of Georgia Power as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of Georgia Power's management. Our responsibility is to express an opinion on Georgia Power's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to Georgia Power in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Georgia Power is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of Georgia Power's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the Audit Committee of Southern Company's Board of Directors and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Impact of Rate Regulation on the Financial Statements – Refer to Note 1 (Summary of Significant Accounting Policies – Regulatory Assets and Liabilities) and Note 2 (Regulatory Matters – Georgia Power) to the financial statements
Critical Audit Matter Description
Georgia Power is subject to retail rate regulation by the Georgia Public Service Commission and wholesale regulation by the Federal Energy Regulatory Commission (collectively, the "Commissions"). Management has determined that it meets the requirements under accounting principles generally accepted in the United States of America to utilize specialized rules to account for the effects of rate regulation in the preparation of its financial statements. Accounting for the economics of rate regulation may impact multiple financial statement line items and disclosures.
The Commissions set the rates Georgia Power is permitted to charge customers. Rates are determined and approved in regulatory proceedings based on an analysis of Georgia Power's costs to provide utility service and a return on, and recovery of, its investment in the utility business. Current and future regulatory decisions can have an impact on the recovery of costs, the rate of return earned on investments, and the timing and amount of assets to be recovered through rates. The Commissions' regulation of rates is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital. While Georgia Power expects to recover costs from customers through regulated rates, there is a risk that the Commissions will not approve: (1) full recovery of the costs of providing utility service, or (2) full recovery of all amounts invested in the utility business and a reasonable return on those investments.
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We identified the impact of rate regulation related to certain assets and liabilities as a critical audit matter due to the significant judgments made by management to support its assertions about impacted account balances and disclosures and/or the high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs. Management judgments include assessing the likelihood of (1) recovery in future rates of incurred costs, (2) a disallowance of part of the cost of recently completed plant or plant under construction, and/or (3) a refund to customers. Auditing these judgments, which include assumptions about the outcome of future decisions by the Commissions, required specialized knowledge of accounting for rate regulations and the rate setting process due to its inherent complexities.
How the Critical Audit Matter Was Addressed in the Audit
Our audit procedures related to the impact of rate regulation on certain assets and liabilities included the following, among others:
We tested the effectiveness of management's controls over the evaluation of the likelihood of (1) the recovery in future rates of certain incurred costs and (2) refunds or future reductions in rates that should be reported as regulatory liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering certain costs in future rates or of a future reduction in rates. We also tested the effectiveness of management's controls over the initial recognition of regulatory assets or liabilities.
We read and evaluated relevant regulatory orders and/or other relevant publicly available information to assess the likelihood of recovery of certain incurred costs in future rates or of a future reduction in rates based on precedents of the treatment of similar costs under similar circumstances.
We tested certain incurred costs recorded as regulatory assets or liabilities during the period for completeness and accuracy.
We obtained representation from management regarding the likelihood of recoverability of incurred costs and potential refund or future reduction in rates to assess management's assertions about the likelihood of recovery, refund, or a future reduction in rates.
We evaluated Georgia Power's disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, including where there is a high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 14, 2024
We have served as Georgia Power's auditor since 2002.
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STATEMENTS OF INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Georgia Power Company
202320222021
(in millions)
Operating Revenues:
Retail revenues$9,222 $10,792 $8,478 
Wholesale revenues188 235 197 
Other revenues708 557 585 
Total operating revenues10,118 11,584 9,260 
Operating Expenses:
Fuel1,781 2,486 1,449 
Purchased power, non-affiliates517 856 632 
Purchased power, affiliates764 1,401 859 
Other operations and maintenance2,083 2,349 2,213 
Depreciation and amortization1,681 1,430 1,371 
Taxes other than income taxes541 527 476 
Estimated loss on Plant Vogtle Units 3 and 4(68)183 1,692 
Total operating expenses7,299 9,232 8,692 
Operating Income2,819 2,352 568 
Other Income and (Expense):
Allowance for equity funds used during construction165 140 127 
Interest expense, net of amounts capitalized(626)(485)(421)
Other income (expense), net170 176 142 
Total other income and (expense)(291)(169)(152)
Earnings Before Income Taxes2,528 2,183 416 
Income taxes (benefit)448 370 (168)
Net Income$2,080 $1,813 $584 
STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Georgia Power Company
202320222021
(in millions)
Net Income$2,080 $1,813 $584 
Other comprehensive income:
Qualifying hedges:
Changes in fair value, net of tax of $(1), $8, and $—, respectively(2)23 — 
Reclassification adjustment for amounts included in net income,
   net of tax of $2, $2, and $2, respectively
5 
Total other comprehensive income3 28 
Comprehensive Income$2,083 $1,841 $590 
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2023, 2022, and 2021
Georgia Power Company
 202320222021
 (in millions)
Operating Activities:
Net income$2,080 $1,813 $584 
Adjustments to reconcile net income
   to net cash provided from operating activities —
Depreciation and amortization, total1,914 1,622 1,557 
Deferred income taxes184 313 (550)
Allowance for equity funds used during construction(165)(140)(127)
Pension, postretirement, and other employee benefits(272)(240)(148)
Settlement of asset retirement obligations(304)(212)(210)
Storm damage accruals31 213 213 
Retail fuel cost under recovery – long-term(157)(1,646)(410)
Estimated loss on Plant Vogtle Units 3 and 4(68)183 1,692 
Other, net(82)81 53 
Changes in certain current assets and liabilities —
-Receivables(57)(286)81 
-Retail fuel cost under recovery308 — — 
-Fossil fuel stock(189)(43)30 
-Materials and supplies(154)(73)(82)
-Other current assets(63)(83)(30)
-Accounts payable(206)264 186 
-Accrued taxes74 173 21 
-Retail fuel cost over recovery — (113)
-Customer refunds(117)113 
-Other current liabilities(5)(14)(1)
Net cash provided from operating activities2,752 2,038 2,747 
Investing Activities:
Property additions(4,786)(3,809)(3,311)
Nuclear decommissioning trust fund purchases(841)(770)(960)
Nuclear decommissioning trust fund sales821 758 956 
Cost of removal, net of salvage(279)(274)(149)
Change in construction payables, net of joint owner portion50 186 (65)
Payments pursuant to LTSAs(49)(44)(42)
Proceeds from dispositions59 56 
Other investing activities(54)(57)(27)
Net cash used for investing activities(5,079)(3,954)(3,590)
Financing Activities:
Increase (decrease) in notes payable, net811 — (60)
Proceeds —
Senior notes2,450 1,500 750 
Short-term borrowings350 2,100 — 
FFB loan — 440 
Revenue bonds229 200 122 
Redemptions and repurchases —
Senior notes(800)(400)(325)
Short-term borrowings(1,430)(500)— 
FFB loan(86)(88)(96)
Revenue bonds (53)(69)
Other long-term debt (125)— 
Capital contributions from parent company2,291 1,471 1,782 
Payment of common stock dividends(1,855)(1,691)(1,649)
Other financing activities(38)(51)(28)
Net cash provided from financing activities1,922 2,363 867 
Net Change in Cash, Cash Equivalents, and Restricted Cash(405)447 24 
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year480 33 
Cash, Cash Equivalents, and Restricted Cash at End of Year$75 $480 $33 
Supplemental Cash Flow Information:
Cash paid during the period for —
Interest (net of $86, $73, and $63 capitalized, respectively)$592 $432 $382 
Income taxes, net220 30 305 
Noncash transactions — Accrued property additions at year-end680 626 479 
The accompanying notes are an integral part of these financial statements.
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BALANCE SHEETS
At December 31, 2023 and 2022
Georgia Power Company
Assets20232022
(in millions)
Current Assets:
Cash and cash equivalents$9 $364 
Receivables —
Customer accounts, net843 735 
Unbilled revenues275 309 
Under recovered retail fuel clause revenues694 — 
Joint owner accounts119 128 
Affiliated51 53 
Other accounts and notes81 62 
Fossil fuel stock480 291 
Materials and supplies883 729 
Regulatory assets – asset retirement obligations98 158 
Other regulatory assets423 324 
Other current assets305 246 
Total current assets4,261 3,399 
Property, Plant, and Equipment:
In service49,370 41,879 
Less: Accumulated provision for depreciation13,955 13,115 
Plant in service, net of depreciation35,415 28,764 
Nuclear fuel, at amortized cost605 604 
Construction work in progress4,975 8,103 
Total property, plant, and equipment40,995 37,471 
Other Property and Investments:
Nuclear decommissioning trusts, at fair value1,163 1,018 
Equity investments in unconsolidated subsidiaries47 51 
Miscellaneous property and investments151 107 
Total other property and investments1,361 1,176 
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization884 1,007 
Deferred charges related to income taxes594 583 
Prepaid pension costs706 738 
Deferred under recovered retail fuel clause revenues1,211 2,056 
Regulatory assets – asset retirement obligations, deferred3,407 3,671 
Other regulatory assets, deferred2,890 2,522 
Other deferred charges and assets508 540 
Total deferred charges and other assets10,200 11,117 
Total Assets$56,817 $53,163 
The accompanying notes are an integral part of these financial statements.

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BALANCE SHEETS
At December 31, 2023 and 2022
Georgia Power Company
Liabilities and Stockholder's Equity20232022
(in millions)
Current Liabilities:
Securities due within one year$502 $901 
Notes payable1,329 1,600 
Accounts payable —
Affiliated840 928 
Other1,147 1,076 
Customer deposits250 252 
Accrued taxes582 508 
Accrued interest175 157 
Accrued compensation250 254 
Operating lease obligations135 151 
Asset retirement obligations338 295 
Other regulatory liabilities22 170 
Other current liabilities365 286 
Total current liabilities5,935 6,578 
Long-Term Debt16,198 14,009 
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes4,018 3,707 
Deferred credits related to income taxes2,161 2,244 
Accumulated deferred ITCs326 319 
Employee benefit obligations248 318 
Operating lease obligations, deferred740 851 
Asset retirement obligations, deferred5,327 5,739 
Other deferred credits and liabilities481 540 
Total deferred credits and other liabilities13,301 13,718 
Total Liabilities35,434 34,305 
Common Stockholder's Equity:
Common stock, without par value
    (Authorized - 20 million shares; Outstanding - 9 million shares)
398 398 
Paid-in capital17,923 15,626 
Retained earnings3,071 2,846 
Accumulated other comprehensive loss(9)(12)
Total common stockholder's equity (See accompanying statements)
21,383 18,858 
Total Liabilities and Stockholder's Equity$56,817 $53,163 
Commitments and Contingent Matters (See notes)
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2023, 2022, and 2021
Georgia Power Company
Number of Common Shares IssuedCommon StockPaid-In CapitalRetained EarningsAccumulated Other Comprehensive Income (Loss)Total
(in millions)
Balance at December 31, 2020$398 $12,361 $3,789 $(47)$16,501 
Net income— — — 584 — 584 
Capital contributions from parent company— — 1,792 — — 1,792 
Other comprehensive income— — — — 
Cash dividends on common stock— — — (1,649)— (1,649)
Balance at December 31, 2021398 14,153 2,724 (41)17,234 
Net income— — — 1,813 — 1,813 
Capital contributions from parent company— — 1,473 — — 1,473 
Other comprehensive income— — — — 28 28 
Cash dividends on common stock— — — (1,691)— (1,691)
Other— — — — 
Balance at December 31, 20229 398 15,626 2,846 (12)18,858 
Net income   2,080  2,080 
Capital contributions from parent company  2,297   2,297 
Other comprehensive income    3 3 
Cash dividends on common stock   (1,855) (1,855)
Balance at December 31, 20239 $398 $17,923 $3,071 $(9)$21,383 
The accompanying notes are an integral part of these financial statements.
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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Mississippi Power Company
Opinion on the Financial Statements
We have audited the accompanying balance sheets of Mississippi Power Company (Mississippi Power) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2023 and 2022, the related statements of income, comprehensive income, common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2023, the related notes, and the financial statement schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of Mississippi Power as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of Mississippi Power's management. Our responsibility is to express an opinion on Mississippi Power's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to Mississippi Power in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Mississippi Power is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of Mississippi Power's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the Audit Committee of Southern Company's Board of Directors and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Impact of Rate Regulation on the Financial Statements – Refer to Note 1 (Summary of Significant Accounting Policies – Regulatory Assets and Liabilities) and Note 2 (Regulatory Matters – Mississippi Power) to the financial statements
Critical Audit Matter Description
Mississippi Power is subject to retail rate regulation by the Mississippi Public Service Commission and wholesale regulation by the Federal Energy Regulatory Commission (collectively, the "Commissions"). Management has determined that it meets the requirements under accounting principles generally accepted in the United States of America to utilize specialized rules to account for the effects of rate regulation in the preparation of its financial statements. Accounting for the economics of rate regulation may impact multiple financial statement line items and disclosures.
The Commissions set the rates Mississippi Power is permitted to charge customers. Rates are determined and approved in regulatory proceedings based on an analysis of Mississippi Power's costs to provide utility service and a return on, and recovery of, its investment in the utility business. Current and future regulatory decisions can have an impact on the recovery of costs, the rate of return earned on investments, and the timing and amount of assets to be recovered through rates. The Commissions' regulation of rates is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital. While Mississippi Power expects to recover costs from customers through regulated rates, there is a risk that the Commissions will not approve: (1) full recovery of the costs of providing utility service, or (2) full recovery of all amounts invested in the utility business and a reasonable return on those investments.
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We identified the impact of rate regulation related to certain assets and liabilities as a critical audit matter due to the significant judgments made by management to support its assertions about impacted account balances and disclosures and/or the high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs. Management judgments include assessing the likelihood of (1) recovery in future rates of incurred costs, (2) a disallowance of part of the cost of recently completed plant or plant under construction, and/or (3) a refund to customers. Auditing these judgments, which include assumptions about the outcome of future decisions by the Commissions, required specialized knowledge of accounting for rate regulations and the rate setting process due to its inherent complexities.
How the Critical Audit Matter Was Addressed in the Audit
Our audit procedures related to the impact of rate regulation on certain assets and liabilities included the following, among others:
We tested the effectiveness of management's controls over the evaluation of the likelihood of (1) the recovery in future rates of certain incurred costs and (2) refunds or future reductions in rates that should be reported as regulatory liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering certain costs in future rates or of a future reduction in rates. We also tested the effectiveness of management's controls over the initial recognition of regulatory assets or liabilities.
We read and evaluated relevant regulatory orders and/or other relevant publicly available information to assess the likelihood of recovery of certain incurred costs in future rates or of a future reduction in rates based on precedents of the treatment of similar costs under similar circumstances.
We tested certain incurred costs recorded as regulatory assets or liabilities during the period for completeness and accuracy.
We obtained representation from management regarding the likelihood of recoverability of incurred costs and potential refund or future reduction in rates to assess management's assertions about the likelihood of recovery, refund, or a future reduction in rates.
We evaluated Mississippi Power's disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, including where there is a high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 14, 2024
We have served as Mississippi Power's auditor since 2002.

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STATEMENTS OF INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Mississippi Power Company

202320222021
(in millions)
Operating Revenues:
Retail revenues$963 $935 $875 
Wholesale revenues, non-affiliates272 252 230 
Wholesale revenues, affiliates200 460 188 
Other revenues39 47 29 
Total operating revenues1,474 1,694 1,322 
Operating Expenses:
Fuel and purchased power538 789 496 
Other operations and maintenance362 376 313 
Depreciation and amortization190 181 180 
Taxes other than income taxes124 124 128 
Total operating expenses1,214 1,470 1,117 
Operating Income260 224 205 
Other Income and (Expense):
Interest expense, net of amounts capitalized(71)(56)(60)
Other income (expense), net35 33 35 
Total other income and (expense)(36)(23)(25)
Earnings Before Income Taxes224 201 180 
Income taxes36 37 21 
Net Income$188 $164 $159 
STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Mississippi Power Company

202320222021
(in millions)
Net Income$188 $164 $159 
Other comprehensive income:
Qualifying hedges:
Reclassification adjustment for amounts included in net income,
   net of tax of $—, $—, and $—, respectively
 — 
Total other comprehensive income — 
Comprehensive Income$188 $164 $160 
The accompanying notes are an integral part of these financial statements.

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STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2023, 2022, and 2021
Mississippi Power Company
 202320222021
 (in millions)
Operating Activities:
Net income$188 $164 $159 
Adjustments to reconcile net income
   to net cash provided from operating activities —
Depreciation and amortization, total232 223 213 
Deferred income taxes(13)(6)(4)
Pension, postretirement, and other employee benefits(20)(18)(10)
Settlement of asset retirement obligations(18)(20)(24)
System restoration rider and reliability reserve accruals23 32 (2)
Retail fuel cost under recovery – long-term(50)— — 
Other, net(5)21 (21)
Changes in certain current assets and liabilities —
-Receivables85 (82)
-Materials and supplies(9)(10)(6)
-Other current assets7 (15)— 
-Accounts payable(81)97 (35)
-Accrued taxes(7)
-Retail fuel cost over recovery27 — (24)
-Other current liabilities10 (8)(15)
Net cash provided from operating activities369 383 246 
Investing Activities:
Property additions(319)(257)(198)
Cost of removal net of salvage(32)(27)(20)
Payments pursuant to LTSAs(26)(29)(29)
Other investing activities7 (4)(10)
Net cash used for investing activities(370)(317)(257)
Financing Activities:
Increase (decrease) in notes payable, net — (25)
Proceeds —
Senior notes100 — 525 
Revenue bonds 35 — 
Redemptions —
Revenue bonds — (320)
Other long-term debt — (100)
Capital contributions from parent company68 68 120 
Payment of common stock dividends(185)(170)(157)
Other financing activities(3)(1)(10)
Net cash provided from (used for) financing activities(20)(68)33 
Net Change in Cash, Cash Equivalents, and Restricted Cash(21)(2)22 
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year59 61 39 
Cash, Cash Equivalents, and Restricted Cash at End of Year$38 $59 $61 
Supplemental Cash Flow Information:
Cash paid during the period for —
Interest$66 $55 $58 
Income taxes, net52 33 16 
Noncash transactions — Accrued property additions at year-end34 22 25 
The accompanying notes are an integral part of these financial statements. 
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BALANCE SHEETS
At December 31, 2023 and 2022
Mississippi Power Company

Assets20232022
(in millions)
Current Assets:
Cash and cash equivalents$38 $59 
Receivables —
Customer accounts, net36 47 
Unbilled revenues40 47 
Affiliated29 82 
Other accounts and notes20 35 
Fossil fuel stock47 44 
Materials and supplies89 80 
Other regulatory assets56 72 
Other current assets10 38 
Total current assets365 504 
Property, Plant, and Equipment:
In service5,523 5,254 
Less: Accumulated provision for depreciation1,792 1,689 
Plant in service, net of depreciation3,731 3,565 
Construction work in progress203 208 
Total property, plant, and equipment3,934 3,773 
Other Property and Investments158 167 
Deferred Charges and Other Assets:
Deferred charges related to income taxes28 30 
Prepaid pension costs99 109 
Deferred under recovered retail fuel clause revenues50 — 
Regulatory assets – asset retirement obligations244 239 
Other regulatory assets, deferred285 249 
Accumulated deferred income taxes96 107 
Other deferred charges and assets85 94 
Total deferred charges and other assets887 828 
Total Assets$5,344 $5,272 
The accompanying notes are an integral part of these financial statements.

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BALANCE SHEETS
At December 31, 2023 and 2022
Mississippi Power Company

Liabilities and Stockholder's Equity20232022
(in millions)
Current Liabilities:
Securities due within one year$201 $
Accounts payable —
Affiliated82 121 
Other73 106 
Accrued taxes117 124 
Accrued compensation43 37 
Asset retirement obligations29 37 
Over recovered retail fuel clause revenues27 — 
Other regulatory liabilities17 43 
Other current liabilities90 85 
Total current liabilities679 554 
Long-Term Debt1,443 1,544 
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes469 466 
Deferred credits related to income taxes229 253 
Employee benefit obligations67 69 
Asset retirement obligations, deferred139 142 
Other cost of removal obligations186 196 
Other regulatory liabilities, deferred92 96 
Other deferred credits and liabilities37 21 
Total deferred credits and other liabilities1,219 1,243 
Total Liabilities3,341 3,341 
Common Stockholder's Equity:
Common stock, without par value
    (Authorized - 50 million shares; Outstanding - 1 million shares)
38 38 
Paid-in capital4,721 4,652 
Accumulated deficit(2,756)(2,759)
Total common stockholder's equity (See accompanying statements)
2,003 1,931 
Total Liabilities and Stockholder's Equity$5,344 $5,272 
Commitments and Contingent Matters (See notes)
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2023, 2022, and 2021
Mississippi Power Company

Number of Common Shares IssuedCommon
Stock
Paid-In CapitalRetained Earnings (Accumulated Deficit)Accumulated Other Comprehensive Income (Loss)Total
(in millions)
Balance at December 31, 2020$38 $4,460 $(2,754)$(2)$1,742 
Net income— — — 159 — 159 
Capital contributions from parent company— — 122 — — 122 
Other comprehensive income— — — — 
Cash dividends on common stock— — — (157)— (157)
Other— — — (1)— 
Balance at December 31, 202138 4,582 (2,753)— 1,867 
Net income— — — 164 — 164 
Capital contributions from parent company— — 70 — — 70 
Cash dividends on common stock— — — (170)— (170)
Balance at December 31, 20221 38 4,652 (2,759) 1,931 
Net income   188  188 
Capital contributions from parent company  69   69 
Cash dividends on common stock   (185) (185)
Balance at December 31, 20231 $38 $4,721 $(2,756)$ $2,003 
The accompanying notes are an integral part of these financial statements.
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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Southern Power Company and Subsidiary Companies
Opinion on the Financial Statements
We have audited the accompanying consolidated balance sheets of Southern Power Company and subsidiary companies (Southern Power) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2023 and 2022, the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2023, the related notes, and the financial statement schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of Southern Power as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of Southern Power's management. Our responsibility is to express an opinion on Southern Power's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to Southern Power in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Southern Power is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of Southern Power's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the Audit Committee of Southern Company's Board of Directors and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Income/Loss Allocation to Noncontrolling Interests – Refer to Notes 1 and 7 to the financial statements
Critical Audit Matter Description
Southern Power has entered into a number of tax equity partnership arrangements, wherein they agree to sell 100% of a class of membership interests (e.g. Class A) in an entity to a noncontrolling investor in exchange for cash contributions, while retaining control of the entity through a separate class of membership interests (e.g. Class B). The agreements for these partnerships give different rights and priorities to their owners in terms of cash distributions, tax attribute allocations, and partnership income or loss allocations. These provisions make the conventional equity method of accounting where an investor applies its "percentage ownership interest" to the investee's net income under generally accepted accounting principles to determine the investor's share of earnings or losses difficult to apply. Therefore, Southern Power uses the Hypothetical Liquidation at Book Value (HLBV) accounting method to account for these partnership arrangements. The HLBV accounting method calculates each partner's share of income or loss based on the change in net equity the partner can legally claim at the end of the reporting period compared to the beginning of the reporting period. The application of the HLBV accounting method by Southern Power required significant consideration of the allocations between Southern Power and the noncontrolling investors over the life of the agreement and the liquidation provisions of the agreement to determine the appropriate allocation of income or loss between the parties.
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The determination of the appropriate amount of allocated partnership income or loss to noncontrolling interests using the HLBV accounting method required increased audit effort and specialized skill and knowledge, including evaluation of the terms of the agreement and consideration of the appropriateness of the HLBV model based on the provisions of the agreement.
How the Critical Audit Matter Was Addressed in the Audit
Our audit procedures included the following, among others:
We read certain agreements to understand the liquidation provisions and the provisions governing the allocation of benefits.
We evaluated certain HLBV models utilized by management to determine whether the models accurately reflect the allocation of income or loss and tax attributes in accordance with the liquidation provisions and allocation terms defined in the agreements, as well as whether the inputs in the models are accurate and complete.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 14, 2024
We have served as Southern Power's auditor since 2002.
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CONSOLIDATED STATEMENTS OF INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Southern Power Company and Subsidiary Companies
202320222021
(in millions)
Operating Revenues:
Wholesale revenues, non-affiliates$1,597 $2,458 $1,671 
Wholesale revenues, affiliates537 875 515 
Other revenues55 36 30 
Total operating revenues2,189 3,369 2,216 
Operating Expenses:
Fuel706 1,614 802 
Purchased power116 311 139 
Other operations and maintenance473 482 423 
Depreciation and amortization504 516 517 
Taxes other than income taxes51 49 45 
Loss on sales-type leases 40 
Gain on dispositions, net(20)(2)(41)
Total operating expenses1,830 2,971 1,925 
Operating Income359 398 291 
Other Income and (Expense):
Interest expense, net of amounts capitalized(129)(138)(147)
Other income (expense), net12 10 
Total other income and (expense)(117)(131)(137)
Earnings Before Income Taxes242 267 154 
Income taxes (benefit)12 20 (13)
Net Income230 247 167 
Net loss attributable to noncontrolling interests(127)(107)(99)
Net Income Attributable to Southern Power$357 $354 $266 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Southern Power Company and Subsidiary Companies
202320222021
(in millions)
Net Income$230 $247 $167 
Other comprehensive income:
Qualifying hedges:
Changes in fair value, net of tax of $(1), $(30), and $(22), respectively(3)(91)(67)
Reclassification adjustment for amounts included in net income,
   net of tax of $4, $26, and $30, respectively
11 81 89 
Pension and other postretirement benefit plans:
Benefit plan net gain (loss),
   net of tax of $(2), $6, and $5, respectively
(7)18 16 
Reclassification adjustment for amounts included in net income,
   net of tax of $—, $1, and $1, respectively
 
Total other comprehensive income1 10 40 
Comprehensive loss attributable to noncontrolling interests(127)(107)(99)
Comprehensive Income Attributable to Southern Power$358 $364 $306 
The accompanying notes are an integral part of these consolidated financial statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2023, 2022, and 2021
Southern Power Company and Subsidiary Companies
202320222021
 (in millions)
Operating Activities:
Net income$230 $247 $167 
Adjustments to reconcile net income
   to net cash provided from operating activities —
Depreciation and amortization, total524 543 542 
Deferred income taxes16 55 
Utilization of federal investment tax credits332 49 288 
Amortization of investment tax credits(58)(58)(58)
Gain on dispositions, net(20)(2)(41)
Loss on sales-type leases 40 
Other, net28 18 (1)
Changes in certain current assets and liabilities —
-Receivables121 (82)(44)
-Prepaid income taxes2 22 (16)
-Other current assets(24)(11)(14)
-Accounts payable(60)68 30 
-Other current liabilities5 11 
Net cash provided from operating activities1,096 815 951 
Investing Activities:
Acquisitions, net of cash acquired(181)— (345)
Property additions(118)(100)(396)
Change in construction payables21 (69)(15)
Proceeds from dispositions59 48 24 
Payments pursuant to LTSAs(50)(71)(82)
Other investing activities4 (2)11 
Net cash used for investing activities(265)(194)(803)
Financing Activities:
Increase (decrease) in notes payable, net(83)10 36 
Proceeds — Senior notes — 400 
Redemptions — Senior notes(290)(677)(300)
Capital contributions from parent company18 430 
Return of capital to parent company — (271)
Capital contributions from noncontrolling interests21 73 501 
Distributions to noncontrolling interests(234)(259)(351)
Payment of common stock dividends(252)(198)(204)
Other financing activities (2)(14)
Net cash used for financing activities(820)(623)(195)
Net Change in Cash, Cash Equivalents, and Restricted Cash11 (2)(47)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year133 135 182 
Cash, Cash Equivalents, and Restricted Cash at End of Year$144 $133 $135 
Supplemental Cash Flow Information:
Cash paid (received) during the period for —
Interest (net of $3, $—, and $6 capitalized, respectively)$122 $142 $140 
Income taxes, net(254)(15)(275)
Noncash transactions —
Accrued property additions at year-end59 24 72 
LTSA credits utilized from the sale of spare parts23 — — 
Contributions from noncontrolling interests 15 89 
Contributions of wind turbine equipment — 82 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2023 and 2022
Southern Power Company and Subsidiary Companies

Assets20232022
(in millions)
Current Assets:
Cash and cash equivalents$124 $131 
Receivables —
Customer accounts, net136 226 
Affiliated37 51 
Other54 70 
Materials and supplies80 88 
Other current assets92 55 
Total current assets523 621 
Property, Plant, and Equipment:
In service14,690 14,658 
Less: Accumulated provision for depreciation4,119 3,661 
Plant in service, net of depreciation10,571 10,997 
Construction work in progress278 41 
Total property, plant, and equipment10,849 11,038 
Other Property and Investments:
Intangible assets, net of amortization of $148 and $129, respectively243 263 
Equity investments in unconsolidated subsidiaries 49 
Net investment in sales-type leases148 154 
Total other property and investments391 466 
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization488 489 
Prepaid LTSAs248 193 
Income taxes receivable, non-current17 19 
Other deferred charges and assets245 255 
Total deferred charges and other assets998 956 
Total Assets$12,761 $13,081 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2023 and 2022
Southern Power Company and Subsidiary Companies

Liabilities and Stockholders' Equity20232022
(in millions)
Current Liabilities:
Securities due within one year$ $290 
Notes payable138 225 
Accounts payable —
Affiliated82 139 
Other91 67 
Accrued taxes26 24 
Accrued interest27 28 
Operating lease obligations29 28 
Other current liabilities97 83 
Total current liabilities490 884 
Long-Term Debt2,711 2,689 
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes614 279 
Accumulated deferred ITCs1,498 1,556 
Operating lease obligations, deferred517 514 
Other deferred credits and liabilities233 243 
Total deferred credits and other liabilities2,862 2,592 
Total Liabilities6,063 6,165 
Common Stockholder's Equity:
Common stock, par value $0.01 per share
    (Authorized - 1 million shares; Outstanding - 1,000 shares)
 — 
Paid-in capital1,088 1,069 
Retained earnings1,846 1,741 
Accumulated other comprehensive loss(17)(18)
Total common stockholder's equity2,917 2,792 
Noncontrolling Interests3,781 4,124 
Total Stockholders' Equity (See accompanying statements)
6,698 6,916 
Total Liabilities and Stockholders' Equity$12,761 $13,081 
Commitments and Contingent Matters (See notes)
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
For the Years Ended December 31, 2023, 2022, and 2021
Southern Power Company and Subsidiary Companies
Number of Common Shares IssuedCommon StockPaid-In CapitalRetained EarningsAccumulated Other Comprehensive Income (Loss)Total Common Stockholder's EquityNoncontrolling InterestsTotal
(in millions)
Balance at December 31, 2020— $— $914 $1,522 $(67)$2,369 $4,262 $6,631 
Net income (loss)— — — 266 — 266 (99)167 
Return of capital to parent
   company
— — (271)— — (271)— (271)
Capital contributions from parent
   company
— — 10 — — 10 — 10 
Other comprehensive income— — — — 40 40 — 40 
Cash dividends on common
   stock
— — — (204)— (204)— (204)
Capital contributions from
   noncontrolling interests
— — — — — — 590 590 
Distributions to noncontrolling
   interests
— — — — — — (351)(351)
Other— — (15)— (14)— (14)
Balance at December 31, 2021— — 638 1,585 (27)2,196 4,402 6,598 
Net income (loss)— — — 354 — 354 (107)247 
Capital contributions from parent
   company
— — 431 — — 431 — 431 
Other comprehensive income— — — — 10 10 — 10 
Cash dividends on common
   stock
— — — (198)— (198)— (198)
Capital contributions from
   noncontrolling interests
— — — — — 88 88 
Distributions to noncontrolling
   interests
— — — — — — (259)(259)
Other— — — — (1)(1)— (1)
Balance at December 31, 2022  1,069 1,741 (18)2,792 4,124 6,916 
Net income (loss)   357  357 (127)230 
Capital contributions from parent
   company
  19   19  19 
Other comprehensive income    1 1  1 
Cash dividends on common
   stock
   (252) (252) (252)
Capital contributions from
   noncontrolling interests
      21 21 
Distributions to noncontrolling
   interests
      (236)(236)
Other      (1)(1)
Balance at December 31, 2023 $ $1,088 $1,846 $(17)$2,917 $3,781 $6,698 
The accompanying notes are an integral part of these consolidated financial statements.
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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Southern Company Gas and Subsidiary Companies
Opinion on the Financial Statements
We have audited the accompanying consolidated balance sheets of Southern Company Gas and subsidiary companies (Southern Company Gas) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2023 and 2022, the related consolidated statements of income, comprehensive income, common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2023, the related notes, and the financial statement schedule listed in the Index at Item 15 (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of Southern Company Gas as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.
We did not audit the financial statements of Southern Natural Gas Company, L.L.C. (SNG), Southern Company Gas' investment which is accounted for by the use of the equity method. The accompanying consolidated financial statements of Southern Company Gas include its equity investment in SNG of $1,202 million and $1,243 million as of December 31, 2023 and December 31, 2022, respectively, and its earnings from its equity method investment in SNG of $139 million, $146 million, and $127 million for the years ended December 31, 2023, 2022, and 2021, respectively. Those statements were audited by other auditors whose reports (which express unqualified opinions on SNG's financial statements and contain an emphasis of matter paragraph calling attention to SNG's significant transactions with related parties) have been furnished to us, and our opinion, insofar as it relates to the amounts included for SNG, is based solely on the reports of the other auditors.
Basis for Opinion
These financial statements are the responsibility of Southern Company Gas' management. Our responsibility is to express an opinion on Southern Company Gas' financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to Southern Company Gas in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Southern Company Gas is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of Southern Company Gas' internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits and the reports of the other auditors provide a reasonable basis for our opinion.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or required to be communicated to the Audit Committee of Southern Company's Board of Directors and that (1) relates to accounts or disclosures that are material to the financial statements and (2) involved especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Impact of Rate Regulation on the Financial Statements – Refer to Note 1 (Summary of Significant Accounting Policies – Regulatory Assets and Liabilities) and Note 2 (Regulatory Matters – Southern Company Gas) to the financial statements
Critical Audit Matter Description
Southern Company Gas' natural gas distribution utilities (the "regulated utility subsidiaries") are subject to rate regulation by their respective state Public Service Commission or other applicable state regulatory agencies (collectively, the "Commissions"). Management has determined that it meets the requirements under accounting principles generally accepted in the United States of America to utilize specialized rules to account for the effects of rate regulation in the preparation of its financial statements. Accounting for the economics of rate regulation may impact multiple financial statement line items and disclosures.
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The Commissions set the rates the regulated utility subsidiaries are permitted to charge customers. Rates are determined and approved in regulatory proceedings based on an analysis of the applicable regulated utility subsidiary's costs to provide utility service and a return on, and recovery of, its investment in the utility business. Current and future regulatory decisions can have an impact on the recovery of costs, the rate of return earned on investments, and the timing and amount of assets to be recovered through rates. The Commissions' regulation of rates is premised on the full recovery of prudently incurred costs and a reasonable rate of return on invested capital. While Southern Company Gas' regulated utility subsidiaries expect to recover costs from customers through regulated rates, there is a risk that the Commissions will not approve: (1) full recovery of the costs of providing utility service, or (2) full recovery of all amounts invested in the utility business and a reasonable return on those investments.
We identified the impact of rate regulation related to certain assets and liabilities as a critical audit matter due to the significant judgments made by management to support its assertions about impacted account balances and disclosures and/or the high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs. Management judgments include assessing the likelihood of (1) recovery in future rates of incurred costs, (2) a disallowance of part of the cost of recently completed plant or plant under construction, and/or (3) a refund to customers. Auditing these judgments, which include assumptions about the outcome of future decisions by the Commissions, required specialized knowledge of accounting for rate regulations and the rate setting process due to its inherent complexities.
How the Critical Audit Matter Was Addressed in the Audit
Our audit procedures related to the impact of rate regulation on certain assets and liabilities included the following, among others:
We tested the effectiveness of management's controls over the evaluation of the likelihood of (1) the recovery in future rates of certain incurred costs and (2) refunds or future reductions in rates that should be reported as regulatory liabilities; and the monitoring and evaluation of regulatory developments that may affect the likelihood of recovering certain costs in future rates or of a future reduction in rates, including Qualifying Infrastructure Plant capital investments by Nicor Gas. We also tested the effectiveness of management's controls over the initial recognition of regulatory assets or liabilities.
We read and evaluated relevant regulatory orders and/or other relevant publicly available information to assess the likelihood of recovery of certain incurred costs in future rates or of a future reduction in rates based on precedents of the treatment of similar costs under similar circumstances.
We tested certain incurred costs recorded as regulatory assets or liabilities during the period for completeness and accuracy.
We obtained representation from management regarding the likelihood of recoverability of incurred costs and potential refund or future reduction in rates to assess management's assertions about the likelihood of recovery, refund, or a future reduction in rates.
We evaluated Southern Company Gas' disclosures related to the impacts of rate regulation, including the balances recorded and regulatory developments, including where there is a high degree of subjectivity involved in assessing the potential impact of future regulatory orders on incurred costs.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 14, 2024
We have served as Southern Company Gas' auditor since 2016.
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Report of Independent Registered Public Accounting Firm

Board of Directors and Members
Southern Natural Gas Company, L.L.C.
Houston, Texas

Opinion on the Consolidated Financial Statements
We have audited the accompanying consolidated balance sheets of Southern Natural Gas Company, L.L.C. (the "Company") as of December 31, 2023 and 2022, the related consolidated statements of income, members' equity, and cash flows for each of the three years in the period ended December 31, 2023, and the related notes (collectively referred to as the "consolidated financial statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These consolidated financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's consolidated financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB and in accordance with auditing standards generally accepted in the United States of America. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical Audit Matter
The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (i) relates to accounts or disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of the critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
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Fair Value of Investments Measured at Fair Value
As discussed in Note 5 to the consolidated financial statements, the fair value of postretirement benefit plan assets on December 31, 2023, was $66 million. Of this amount, $65 million represents the fair value of private debt and equity securities measured at net asset value (NAV).
We identified the assessment of the fair value of investments measured at NAV as a critical audit matter. Subjective auditor judgment was required in the application and performance of procedures to assess the fair value of the investments measured at NAV because the determination involved the use of unobservable inputs. Additionally, specialized skills and knowledge were required to assess the fair value of the investments measured at NAV and to assess the sufficiency of audit evidence obtained.
The primary procedures we performed to address this critical audit matter included:
Comparing the fair values as recorded by the Company to external confirmations received directly from the third-party investment managers.
Utilized specialists who performed a benchmark analysis to determine the correlation of the funds and the stated benchmark; the results were used to estimate the high and low fair value range of the investments to compare to the Company's fair value.
Emphasis of Matter – Significant Transactions with Related Parties
As discussed in Note 6 to the consolidated financial statements, the Company has entered into significant transactions with related parties.
/s/ BDO USA, P.C.
We have served as the Company's auditor since 2018.
Houston, Texas
February 6, 2024
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CONSOLIDATED STATEMENTS OF INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company Gas and Subsidiary Companies

202320222021
(in millions)
Operating Revenues:
Natural gas revenues (includes revenue taxes of
   $133, $162, and $122, respectively)
$4,702 $5,962 $4,380 
Total operating revenues4,702 5,962 4,380 
Operating Expenses: 
Cost of natural gas1,644 3,004 1,619 
Other operations and maintenance1,194 1,176 1,072 
Depreciation and amortization582 559 536 
Taxes other than income taxes262 282 225 
Impairment charges 131 — 
Estimated loss on regulatory disallowance88 — — 
Gain on dispositions, net(7)(4)(127)
Total operating expenses3,763 5,148 3,325 
Operating Income939 814 1,055 
Other Income and (Expense):
Earnings from equity method investments140 148 50 
Interest expense, net of amounts capitalized(310)(263)(238)
Other income (expense), net57 53 (53)
Total other income and (expense)(113)(62)(241)
Earnings Before Income Taxes826 752 814 
Income taxes211 180 275 
Net Income$615 $572 $539 

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company Gas and Subsidiary Companies
202320222021
(in millions)
Net Income$615 $572 $539 
Other comprehensive income (loss):
Qualifying hedges:
Changes in fair value, net of tax of $(18), $5, and $5, respectively(45)13 17 
Reclassification adjustment for amounts included in net income,
   net of tax of $19, $(9), and $(5), respectively
46 (24)(11)
Pension and other postretirement benefit plans:
Benefit plan net gain (loss),
   net of tax of $(7), $8, and $17, respectively
(15)18 40 
Reclassification adjustment for amounts included in net income,
   net of tax of $—, $—, and $—, respectively
(1)— — 
Total other comprehensive income (loss)(15)46 
Comprehensive Income$600 $579 $585 
The accompanying notes are an integral part of these consolidated financial statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company Gas and Subsidiary Companies
202320222021
(in millions)
Operating Activities:
Consolidated net income$615 $572 $539 
Adjustments to reconcile net income to net cash
   provided from operating activities —
Depreciation and amortization, total582 558 536 
Deferred income taxes126 17 259 
Impairment charges 131 84 
Gain on dispositions, net(7)(4)(127)
Mark-to-market adjustments(7)12 194 
Natural gas cost under recovery – long-term 207 (207)
Estimated loss on regulatory disallowance96 — — 
Other, net(60)(32)(30)
Changes in certain current assets and liabilities —
-Receivables431 (345)(143)
-Natural gas for sale, net of temporary LIFO liquidation19 (77)
-Prepaid income taxes(11)19 (82)
-Natural gas cost under recovery108 158 (266)
-Other current assets(17)(6)(116)
-Accounts payable(276)299 40 
-Natural gas cost over recovery214 — — 
-Other current liabilities(51)10 (26)
Net cash provided from operating activities1,762 1,519 663 
Investing Activities:
Property additions(1,561)(1,533)(1,421)
Cost of removal, net of salvage(104)(112)(106)
Change in construction payables, net(38)65 (29)
Investments in unconsolidated subsidiaries(11)(165)(5)
Proceeds from dispositions42 150 150 
Other investing activities16 15 32 
Net cash used for investing activities(1,656)(1,580)(1,379)
Financing Activities:
Increase (decrease) in notes payable, net(153)(341)585 
Proceeds —
Senior notes500 500 450 
First mortgage bonds275 175 200 
Short-term borrowings 50 300 
Other long-term debt37 22 — 
Redemptions and repurchases —
Senior notes — (300)
Short-term borrowings(200)(150)— 
Medium-term notes(350)(46)(30)
First mortgage bonds(50)— — 
Capital contributions from parent company373 406 72 
Payment of common stock dividends(585)(519)(530)
Other financing activities(1)(1)(2)
Net cash provided from (used for) financing activities(154)96 745 
Net Change in Cash, Cash Equivalents, and Restricted Cash(48)35 29 
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year83 48 19 
Cash, Cash Equivalents, and Restricted Cash at End of Year$35 $83 $48 
Supplemental Cash Flow Information:
Cash paid during the period for —
Interest (net of $16, $10, and $8 capitalized, respectively)$291 $258 $244 
Income taxes, net91 208 57 
Noncash transactions — Accrued property additions at year-end139 177 113 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2023 and 2022
Southern Company Gas and Subsidiary Companies

Assets20232022
(in millions)
Current Assets:  
Cash and cash equivalents$33 $81 
Receivables —  
Customer accounts405 616 
Unbilled revenues261 453 
Other accounts and notes47 76 
Accumulated provision for uncollectible accounts(44)(50)
Natural gas for sale420 438 
Prepaid expenses107 93 
Natural gas cost under recovery 108 
Other regulatory assets141 119 
Other current assets116 104 
Total current assets1,486 2,038 
Property, Plant, and Equipment:  
In service20,840 19,723 
Less: Accumulated depreciation5,534 5,276 
Plant in service, net of depreciation15,306 14,447 
Construction work in progress1,110 909 
Total property, plant, and equipment16,416 15,356 
Other Property and Investments:
Goodwill5,015 5,015 
Equity investments in unconsolidated subsidiaries1,235 1,276 
Other intangible assets, net of amortization of $166 and $156, respectively16 26 
Miscellaneous property and investments25 28 
Total other property and investments6,291 6,345 
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization47 57 
Prepaid pension costs158 183 
Other regulatory assets, deferred504 497 
Other deferred charges and assets181 145 
Total deferred charges and other assets890 882 
Total Assets$25,083 $24,621 
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2023 and 2022
Southern Company Gas and Subsidiary Companies

Liabilities and Stockholder's Equity20232022
(in millions)
Current Liabilities:
Securities due within one year$ $400 
Notes payable415 768 
Accounts payable —
Affiliated89 104 
Other424 701 
Customer deposits126 125 
Accrued taxes77 77 
Accrued compensation112 105 
Natural gas cost over recovery214 — 
Other regulatory liabilities19 36 
Other current liabilities232 254 
Total current liabilities1,708 2,570 
Long-term Debt7,833 7,042 
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes1,671 1,560 
Deferred credits related to income taxes759 788 
Employee benefit obligations110 120 
Operating lease obligations40 51 
Other cost of removal obligations1,771 1,707 
Accrued environmental remediation192 207 
Other deferred credits and liabilities196 179 
Total deferred credits and other liabilities4,739 4,612 
Total Liabilities14,280 14,224 
Common Stockholder’s Equity:
Common stock, par value $0.01 per share
    (Authorized - 100 million shares; Outstanding - 100 shares)
Paid-in capital10,836 10,445 
Accumulated deficit(49)(79)
Accumulated other comprehensive income (loss)16 31 
Total common stockholder's equity (See accompanying statements)
10,803 10,397 
Total Liabilities and Stockholder's Equity$25,083 $24,621 
Commitments and Contingent Matters (See notes)
The accompanying notes are an integral part of these consolidated financial statements.

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CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2023, 2022, and 2021
Southern Company Gas and Subsidiary Companies
Number of Common Shares
Issued
Common StockPaid-In CapitalRetained Earnings (Accumulated Deficit)Accumulated
Other
Comprehensive Income (Loss)
Total
(in millions)
Balance at December 31, 2020— $— $9,930 $(141)$(22)$9,767 
Net income— — — 539 — 539 
Capital contributions from parent company— — 94 — — 94 
Other comprehensive income— — — — 46 46 
Cash dividends on common stock— — — (530)— (530)
Balance at December 31, 2021— — 10,024 (132)24 9,916 
Net income— — — 572 — 572 
Capital contributions from parent company— — 421 — — 421 
Other comprehensive income— — — — 
Cash dividends on common stock— — — (519)— (519)
Balance at December 31, 2022  10,445 (79)31 10,397 
Net income   615  615 
Capital contributions from parent company  391   391 
Other comprehensive income (loss)    (15)(15)
Cash dividends on common stock   (585) (585)
Balance at December 31, 2023 $ $10,836 $(49)$16 $10,803 
The accompanying notes are an integral part of these consolidated financial statements. 
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Notes to the Financial Statements
for
The Southern Company and Subsidiary Companies
Alabama Power Company
Georgia Power Company
Mississippi Power Company
Southern Power Company and Subsidiary Companies
Southern Company Gas and Subsidiary Companies



Index to the Combined Notes to Financial Statements
NotePage
1
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Index to Applicable Notes to Financial Statements by Registrant
The following notes to the financial statements are a combined presentation; however, information contained herein relating to any individual Registrant is filed by such Registrant on its own behalf and each Registrant makes no representation as to information related to the other Registrants. The list below indicates the Registrants to which each note applies.
RegistrantApplicable Notes
Southern Company1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
Alabama Power1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
Georgia Power1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
Mississippi Power1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14
Southern Power1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
Southern Company Gas1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16

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1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
Southern Company is the parent company of three traditional electric operating companies, as well as Southern Power, Southern Company Gas, SCS, Southern Linc, Southern Holdings, Southern Nuclear, PowerSecure, and other direct and indirect subsidiaries. The traditional electric operating companies – Alabama Power, Georgia Power, and Mississippi Power – are vertically integrated utilities providing electric service in three Southeastern states. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through natural gas distribution utilities, including Nicor Gas (Illinois), Atlanta Gas Light (Georgia), Virginia Natural Gas, and Chattanooga Gas (Tennessee). Southern Company Gas is also involved in several other complementary businesses including gas pipeline investments and gas marketing services. Prior to the sale of Sequent on July 1, 2021, these businesses also included wholesale gas services. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants, including Alabama Power's Plant Farley and Georgia Power's Plant Hatch and Plant Vogtle Units 1 through 3, and is currently managing construction and start-up of Plant Vogtle Unit 4. PowerSecure develops distributed energy and resilience solutions and deploys microgrids for commercial, industrial, governmental, and utility customers. See Note 15 for information regarding the sale of Sequent.
The Registrants' financial statements reflect investments in subsidiaries on a consolidated basis. Intercompany transactions have been eliminated in consolidation. The equity method is used for investments in entities in which a Registrant has significant influence but does not have control and for VIEs where a Registrant has an equity investment but is not the primary beneficiary. Southern Power has controlling ownership in certain legal entities for which the contractual provisions represent profit-sharing arrangements because the allocations of cash distributions and tax benefits are not based on fixed ownership percentages. For these arrangements, the noncontrolling interest is accounted for under a balance sheet approach utilizing the HLBV method. The HLBV method calculates each partner's share of income based on the change in net equity the partner can legally claim in a HLBV at the end of the period compared to the beginning of the period. See "Variable Interest Entities" herein and Note 7 for additional information.
The traditional electric operating companies, Southern Power, certain subsidiaries of Southern Company Gas, and certain other subsidiaries are subject to regulation by the FERC, and the traditional electric operating companies and the natural gas distribution utilities are also subject to regulation by their respective state PSCs or other applicable state regulatory agencies. As such, the respective financial statements of the applicable Registrants reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by relevant state PSCs or other applicable state regulatory agencies.
The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation. These reclassifications had no impact on the Registrants' results of operations, financial position, or cash flows.
Recently Adopted Accounting Standards
In 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASU 2020-04) providing temporary guidance to ease the potential burden in accounting for reference rate reform primarily resulting from the discontinuation of LIBOR, which began phasing out on December 31, 2021. The discontinuation date of the overnight 1-, 3-, 6-, and 12-month tenors of LIBOR was June 30, 2023, which was beyond the original effective date of ASU 2020-04; therefore, in December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848 (ASU 2022-06) to defer the sunset date of ASU 2020-04 from December 31, 2022 to December 31, 2024.
The amendments were elective and applied to all entities that have contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued. The guidance (i) simplified accounting analyses under current GAAP for contract modifications; (ii) simplified the assessment of hedge effectiveness and allows hedging relationships affected by reference rate reform to continue; and (iii) allowed a one-time election to sell or transfer debt securities classified as held to maturity that reference a rate affected by reference rate reform. An entity could elect to apply the amendments
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prospectively from March 12, 2020 through December 31, 2024 by accounting topic. The Registrants elected to apply the amendments to modifications of debt and derivative arrangements that meet the scope of ASU 2020-04 and ASU 2022-06.
Certain provisions in PPAs at Southern Power included references to LIBOR. Contract amendments have been executed to change to a SOFR-based interest rate. Southern Power adopted and applied the practical expedients guidance to these PPAs. Additionally, the Registrants referenced LIBOR for certain debt and hedging arrangements. As of July 1, 2023, all of the debt and hedging arrangements of the Registrants had transitioned to a SOFR-based interest rate based on the terms of the agreements. There were no material impacts from the transition to SOFR and no impacts to any existing accounting conclusions. See Note 14 under "Interest Rate Derivatives" for additional information.
Affiliate Transactions
The traditional electric operating companies, Southern Power, and Southern Company Gas have agreements with SCS under which certain of the following services are rendered to them at direct or allocated cost: general executive and advisory, general and design engineering, operations, purchasing, accounting, finance, treasury, legal, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, cellular tower space, and other services with respect to business and operations, construction management, and Southern Company power pool transactions. These costs are primarily included in other operations and maintenance expenses or capitalized to property, plant, and equipment. Costs for these services from SCS in 2023, 2022, and 2021 were as follows:
Alabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern Company Gas
(in millions)
2023$611 $857 $113 $86 $261 
2022549 762 115 86 262 
2021504 663 120 89 239 
Alabama Power and Georgia Power also have agreements with Southern Nuclear under which Southern Nuclear renders the following nuclear-related services at cost: general executive and advisory services; general operations, management, and technical services; administrative services including procurement, accounting, employee relations, systems, and procedures services; strategic planning and budgeting services; other services with respect to business and operations; and, for Georgia Power, construction management. These costs are primarily included in other operations and maintenance expenses or capitalized to property, plant, and equipment. Costs for these services in 2023, 2022, and 2021 amounted to $251 million, $267 million, and $258 million, respectively, for Alabama Power and $899 million, $895 million, and $906 million, respectively, for Georgia Power. See Note 2 under "Georgia Power – Nuclear Construction" for additional information regarding Southern Nuclear's construction management of Plant Vogtle Unit 4 for Georgia Power.
Cost allocation methodologies used by SCS and Southern Nuclear prior to the repeal of the Public Utility Holding Company Act of 1935, as amended, were approved by the SEC. Subsequently, additional cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies.
Alabama Power's and Georgia Power's power purchases from affiliates through the Southern Company power pool are included in purchased power, affiliates on their respective statements of income. Mississippi Power's and Southern Power's power purchases from affiliates through the Southern Company power pool are included in purchased power on their respective statements of income and were as follows:
Mississippi
Power
Southern
Power
(in millions)
2023$$13 
202229 
202115 
Georgia Power has entered into several PPAs with Southern Power for capacity and energy. Georgia Power's total expenses associated with these PPAs were $143 million, $151 million, and $132 million in 2023, 2022, and 2021, respectively. Southern Power's total revenues from all PPAs with Georgia Power, included in wholesale revenue affiliates on Southern Power's consolidated statements of income, were $145 million, $154 million, and $139 million for 2023, 2022, and 2021, respectively. Included within these revenues were affiliate PPAs accounted for as operating leases, which totaled $116 million, $116 million,
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and $112 million for 2023, 2022, and 2021, respectively. See Note 9 for additional information. Also see Note 2 under "Georgia Power – Integrated Resource Plans" for information regarding additional affiliate PPAs commencing in 2024.
SCS (as agent for Alabama Power, Georgia Power, and Southern Power) and Southern Company Gas have long-term interstate natural gas transportation agreements with SNG that are governed by the terms and conditions of SNG's natural gas tariff and are subject to FERC regulation. See Note 7 under "Southern Company Gas – Equity Method Investments" for additional information. Transportation costs under these agreements in 2023, 2022, and 2021 were as follows:
Alabama
Power
Georgia
Power
Southern
Power
Southern Company Gas
(in millions)
2023$12 $101 $34 $28 
202218 99 37 27 
202114 108 31 29 
SCS, as agent for the traditional electric operating companies and Southern Power, has agreements with certain subsidiaries of Southern Company Gas to purchase natural gas. Natural gas purchases made under these agreements were immaterial for Alabama Power, Georgia Power, and Mississippi Power for all periods presented, immaterial for Southern Power in 2023 and 2022, and $18 million for Southern Power in 2021.
Alabama Power and Mississippi Power jointly own Plant Greene County. The companies have an agreement under which Alabama Power operates Plant Greene County and Mississippi Power reimburses Alabama Power for its proportionate share of non-fuel operations and maintenance expenses, which totaled $5 million, $6 million, and $10 million in 2023, 2022, and 2021, respectively. See Note 5 under "Joint Ownership Agreements" for additional information.
Alabama Power, Georgia Power, and Mississippi Power each have agreements with PowerSecure for equipment purchases and/or services related to utility infrastructure construction, distributed energy, and energy efficiency projects. Costs under these agreements were immaterial for all periods presented.
Southern Company Gas has a $77 million contract with the U.S. General Services Administration to increase energy efficiency at certain federal buildings across Georgia, with completion expected by the end of 2024. Southern Company Gas engaged PowerSecure to provide the majority of the construction services under the contract. During 2023 and 2022, Southern Company Gas paid $29 million and $10 million, respectively, to PowerSecure related to this agreement.
See Note 7 under "SEGCO" for information regarding Alabama Power's and Georgia Power's equity method investment in SEGCO and related affiliate purchased power costs, as well as Alabama Power's gas pipeline ownership agreement with SEGCO.
Southern Power has several agreements with SCS for transmission services, which are billed to Southern Power based on the Southern Company Open Access Transmission Tariff as filed with the FERC. Transmission services purchased by Southern Power from SCS totaled $33 million, $39 million, and $28 million for 2023, 2022, and 2021, respectively, and were charged to other operations and maintenance expenses in Southern Power's consolidated statements of income.
The traditional electric operating companies and Southern Power may jointly enter into various types of wholesale energy, natural gas, and certain other contracts, either directly or through SCS as agent. Each participating company may be jointly and severally liable for the obligations incurred under these agreements. See Note 14 under "Contingent Features" for additional information. Southern Power and the traditional electric operating companies generally settle amounts related to the above transactions on a monthly basis in the month following the performance of such services or the purchase or sale of electricity. See "Revenues – Southern Power" herein for additional information.
The traditional electric operating companies, Southern Power, and Southern Company Gas provide incidental services to and receive such services from other Southern Company subsidiaries which are generally minor in duration and amount. Except as described herein, the traditional electric operating companies, Southern Power, and Southern Company Gas neither provided nor received any material services to or from affiliates in any year presented.
Regulatory Assets and Liabilities
The traditional electric operating companies and the natural gas distribution utilities are subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent costs recovered that are expected to be incurred in the future or probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process.
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In the event that a portion of a traditional electric operating company's or a natural gas distribution utility's operations is no longer subject to applicable accounting rules for rate regulation, such company would be required to write off to income or reclassify to AOCI related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the traditional electric operating company or the natural gas distribution utility would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 2 for additional information including details of regulatory assets and liabilities reflected in the balance sheets for Southern Company, the traditional electric operating companies, and Southern Company Gas.
Revenues
The Registrants generate revenues from a variety of sources which are accounted for under various revenue accounting guidance, including revenue from contracts with customers, lease, derivative, and regulatory accounting. See Notes 4, 9, and 14 for additional information.
Traditional Electric Operating Companies
The majority of the revenues of the traditional electric operating companies are generated from contracts with retail electric customers. These revenues, generated from the integrated service to deliver electricity when and if called upon by the customer, are recognized as a single performance obligation satisfied over time, at a tariff rate, and as electricity is delivered to the customer during the month. Unbilled revenues related to retail sales are accrued at the end of each fiscal period. Retail rates may include provisions to adjust revenues for fluctuations in fuel costs, fuel hedging, the energy component of purchased power costs, and certain other costs. Revenues are adjusted for differences between these actual costs and amounts billed in current regulated rates. Under or over recovered regulatory clause revenues are recorded in the balance sheets and are recovered from or returned to customers, respectively, through adjustments to the billing factors. See Note 2 for additional information regarding regulatory matters of the traditional electric operating companies.
Wholesale capacity revenues from PPAs are recognized in amounts billable under the contract terms. Energy and other revenues are generally recognized as services are provided. The contracts for capacity and energy in a wholesale PPA have multiple performance obligations where the contract's total transaction price is allocated to each performance obligation based on the standalone selling price. The standalone selling price is primarily determined by the price charged to customers for the specific goods or services transferred with the performance obligations. Generally, the traditional electric operating companies recognize revenue as the performance obligations are satisfied over time as electricity is delivered to the customer or as generation capacity is available to the customer.
For both retail and wholesale revenues, the traditional electric operating companies have elected to recognize revenue for their sales of electricity and capacity using the invoice practical expedient as they generally have a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and that may be invoiced. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of the Registrants' performance obligation.
Southern Power
Southern Power sells capacity and energy at rates specified under contractual terms in long-term PPAs. These PPAs are accounted for as leases, normal sale derivatives, or contracts with customers. Capacity revenues from PPAs classified as operating leases are recognized on a straight-line basis over the term of the agreement. Energy revenues are recognized in the period the energy is delivered. Capacity revenues from PPAs classified as sales-type leases are recognized by accounting for interest income on the net investment in the lease.
Southern Power's non-lease contracts commonly include capacity and energy which are considered separate performance obligations. In these contracts, the total transaction price is allocated to each performance obligation based on the standalone selling price. The standalone selling price is primarily determined by the price charged to customers for the specific goods or services transferred with the performance obligations. Generally, Southern Power recognizes revenue as the performance obligations are satisfied over time, as electricity is delivered to the customer or as generation capacity is made available to the customer.
Southern Power generally has a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and may recognize revenue in the amount to which the entity has a right to invoice. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of Southern Power's performance obligation.
When multiple contracts exist with the same counterparty, the revenues from each contract are accounted for as separate arrangements.
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Southern Power may also enter into contracts to sell short-term capacity in the wholesale electricity markets. These sales are generally classified as mark-to-market derivatives and net unrealized gains and losses on such contracts are recorded in wholesale revenues. See Note 14 and "Financial Instruments" herein for additional information.
Southern Company Gas
Gas Distribution Operations
Southern Company Gas records revenues when goods or services are provided to customers. Those revenues are based on rates approved by the state regulatory agencies of the natural gas distribution utilities. Atlanta Gas Light operates in a deregulated natural gas market whereby Marketers, rather than a traditional utility, sell natural gas to end-use customers in Georgia and handle customer billing functions. As required by the Georgia PSC, Atlanta Gas Light bills Marketers in equal monthly installments for each residential, commercial, and industrial end-use customer's distribution costs as well as for capacity costs utilizing a seasonal rate design for the calculation of each residential end-use customer's annual straight-fixed-variable charge, which reflects the historic volumetric usage pattern for the entire residential class.
The majority of the revenues of Southern Company Gas are generated from contracts with natural gas distribution customers. Revenues from this integrated service to deliver gas when and if called upon by the customer are recognized as a single performance obligation satisfied over time and are recognized at a tariff rate as gas is delivered to the customer during the month.
The standalone selling price is primarily determined by the price charged to customers for the specific goods or services transferred with the performance obligations. Generally, Southern Company Gas recognizes revenue as the performance obligations are satisfied over time as natural gas is delivered to the customer. The performance obligations related to wholesale gas services are satisfied, and revenue is recognized, at a point in time when natural gas is delivered to the customer.
Southern Company Gas has elected to recognize revenue for sales of gas using the invoice practical expedient as it generally has a right to consideration in an amount that corresponds directly with the value to the customer of the performance completed to date and that may be invoiced. Payment for goods and services rendered is typically due in the subsequent month following satisfaction of Southern Company Gas' performance obligation.
With the exception of Atlanta Gas Light, the natural gas distribution utilities have rate structures that include volumetric rate designs that allow the opportunity to recover certain costs based on gas usage. Revenues from sales and transportation services are recognized in the same period in which the related volumes are delivered to customers. Revenues from residential and certain commercial and industrial customers are recognized on the basis of scheduled meter readings. Additionally, unbilled revenues are recognized for estimated deliveries of gas not yet billed to these customers, from the last bill date to the end of the accounting period. For other commercial and industrial customers, revenues are based on actual deliveries through the end of the period.
The tariffs for the natural gas distribution utilities include provisions which allow for the recognition of certain revenues prior to the time such revenues are billed to customers. These provisions are referred to as alternative revenue programs and provide for the recognition of certain revenues prior to billing, as long as the amounts recognized will be collected from customers within 24 months of recognition. Revenue related to alternative revenue programs was $20 million, $(5) million, and $11 million in 2023, 2022, and 2021, respectively. These programs are as follows:
Weather normalization adjustments – reduce customer bills when winter weather is colder than normal and increase customer bills when weather is warmer than normal and are included in the tariffs for Virginia Natural Gas and Chattanooga Gas;
Revenue normalization mechanisms – mitigate the impact of conservation and declining customer usage and are contained in the tariffs for Virginia Natural Gas and Nicor Gas; and
Revenue true-up adjustment – included within the provisions of the GRAM program in which Atlanta Gas Light participates as a short-term alternative to formal rate case filings, the revenue true-up feature provides for a positive (or negative) adjustment to record revenue in the amount of any variance to budgeted revenues, which are submitted and approved annually as a requirement of GRAM. Such adjustments are reflected in customer billings in a subsequent program year.
Wholesale Gas Services
Prior to the sale of Sequent on July 1, 2021, Southern Company Gas netted revenues from energy and risk management activities with the associated costs. Profits from sales between segments were eliminated and recognized as goods or services sold to end-use customers. Southern Company Gas recorded wholesale gas services' transactions that qualified as derivatives at fair value with changes in fair value recognized in earnings in the period of change and characterized as unrealized gains or losses. Gains
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and losses on derivatives held for energy trading purposes were presented on a net basis in revenue. See Note 15 under "Southern Company Gas" for additional information on the sale of Sequent.
Gas Marketing Services
Southern Company Gas recognizes revenues from natural gas sales and transportation services in the same period in which the related volumes are delivered to customers and recognizes sales revenues from residential and certain commercial and industrial customers on the basis of scheduled meter readings. Southern Company Gas also recognizes unbilled revenues for estimated deliveries of gas not yet billed to these customers from the most recent meter reading date to the end of the accounting period. For other commercial and industrial customers and for all wholesale customers, revenues are based on actual deliveries during the period.
Southern Company Gas recognizes revenues on 12-month utility-bill management contracts as the lesser of cumulative earned or cumulative billed amounts.
Concentration of Revenue
Southern Company, Alabama Power, Georgia Power, Mississippi Power (with the exception of its full requirements cost-based MRA electric tariffs described below), Southern Power, and Southern Company Gas each have a diversified base of customers and no single customer comprises 10% or more of each company's revenues.
Mississippi Power provides service under long-term contracts with rural electric cooperative associations and a municipality located in southeastern Mississippi under requirements cost-based MRA electric tariffs, which are subject to regulation by the FERC. The contracts with these wholesale customers represented 14.0% of Mississippi Power's total operating revenues in 2023.
Fuel Costs
Fuel costs for the traditional electric operating companies and Southern Power are expensed as the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. For Alabama Power and Georgia Power, fuel expense also includes the amortization of the cost of nuclear fuel. For the traditional electric operating companies, fuel costs also include gains and/or losses from fuel-hedging programs as approved by their respective state PSCs.
Cost of Natural Gas
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, Southern Company Gas charges its utility customers for natural gas consumed using natural gas cost recovery mechanisms set by the applicable state regulatory agencies. Under these mechanisms, all prudently-incurred natural gas costs are passed through to customers without markup, subject to regulatory review. Southern Company Gas defers or accrues the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period such that no operating income is recognized related to these costs. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred and accrued natural gas costs are included in the balance sheets as regulatory assets and regulatory liabilities, respectively.
Southern Company Gas' gas marketing services' customers are charged for actual or estimated natural gas consumed. Within cost of natural gas, Southern Company Gas also includes costs of lost and unaccounted for gas and gains and losses associated with certain derivatives.
Income Taxes
The Registrants use the liability method of accounting for deferred income taxes and provide deferred income taxes for all significant income tax temporary differences. In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies are amortized over the average life of the related property, with such amortization normally applied as a credit to reduce depreciation and amortization in the statements of income. Southern Power's and the natural gas distribution utilities' deferred federal ITCs, as well as certain state ITCs for Nicor Gas, are amortized to income tax expense over the life of the respective asset.
Under current tax law, certain projects at Southern Power related to the construction of renewable facilities are eligible for federal ITCs. Southern Power estimates eligible costs which, as they relate to acquisitions, may not be finalized until the allocation of the purchase price to assets has been finalized. Southern Power applies the deferred method to ITCs, whereby the ITCs are recorded as a deferred credit and amortized to income tax expense over the life of the respective asset. Furthermore, the tax basis of the asset is reduced by 50% of the ITCs received, resulting in a net deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. State ITCs are recognized as an income tax benefit in the period in which the credits are generated. In addition, certain projects are eligible for federal and state PTCs, which are recognized as an income tax benefit based on KWH production.
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Federal ITCs and PTCs, as well as state ITCs and other state tax credits available to reduce income taxes payable, were not fully utilized in 2023 and will be carried forward and utilized in future years. In addition, Southern Company is expected to have various state net operating loss (NOL) carryforwards for certain of its subsidiaries, including Mississippi Power and Southern Power, which would result in income tax benefits in the future, if utilized. See Note 10 under "Current and Deferred Income TaxesTax Credit Carryforwards" and " Net Operating Loss Carryforwards" for additional information.
In June 2023, the IRS issued temporary regulations related to the transferability of certain tax credits under the IRA. Southern Company and certain subsidiaries have tax credits that are eligible to be transferred. The discount recorded on transferred credits is booked through income tax expense.
Under current tax law, Georgia Power is eligible to generate advanced nuclear PTCs for Plant Vogtle Unit 3, which are recognized as an income tax benefit based on KWH production and are eligible to be transferred. Pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 from the other Vogtle Owners. The gain recognized on the purchase of the joint owner PTCs is recognized as an income tax benefit.
The Registrants recognize tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 10 under "Unrecognized Tax Benefits" for additional information.
Other Taxes
Taxes imposed on and collected from customers on behalf of governmental agencies are presented net on the Registrants' statements of income and are excluded from the transaction price in determining the revenue related to contracts with a customer.
Southern Company Gas is taxed on its gas revenues by various governmental authorities, but is allowed to recover these taxes from its customers. Revenue taxes imposed on the natural gas distribution utilities are recorded at the amount charged to customers, which may include a small administrative fee, as operating revenues, and the related taxes imposed on Southern Company Gas are recorded as operating expenses on the statements of income. Revenue taxes included in operating expenses were $129 million, $158 million, and $119 million in 2023, 2022, and 2021, respectively.
Allowance for Funds Used During Construction and Interest Capitalized
The traditional electric operating companies and the natural gas distribution utilities record AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the asset through a higher rate base and higher depreciation. The equity component of AFUDC is not taxable.
Interest related to financing the construction of new facilities at Southern Power and new facilities not included in the traditional electric operating companies' and Southern Company Gas' regulated rates is capitalized in accordance with standard interest capitalization requirements.
Total AFUDC and interest capitalized for the applicable Registrants in 2023, 2022, and 2021 was as follows:
Southern CompanyAlabama
Power
Georgia
Power
(*)
Southern
Power
Southern Company Gas
(in millions)
2023$400 $109 $251 $$37 
2022327 90 213 — 24 
2021282 68 190 18 
(*)See Note 2 under "Georgia Power – Nuclear Construction" for information on the inclusion of a portion of construction costs related to Plant Vogtle Unit 4 in Georgia Power's rate base.
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The average AFUDC composite rates for 2023, 2022, and 2021 for the traditional electric operating companies and the natural gas distribution utilities were as follows:
202320222021
Alabama Power8.1 %7.9 %7.9 %
Georgia Power(a)
7.6 %7.3 %7.2 %
Mississippi Power(b)
— %5.3 %2.5 %
Southern Company Gas:
Atlanta Gas Light7.4 %7.6 %7.7 %
Chattanooga Gas7.1 %7.1 %7.1 %
Nicor Gas4.6 %2.0 %0.1 %
(a)Excludes AFUDC related to the construction of Plant Vogtle Units 3 and 4. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
(b)Mississippi Power's AFUDC was immaterial in 2023.
Impairment of Long-Lived Assets
The Registrants evaluate long-lived assets and finite-lived intangible assets for impairment when events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance, a sales transaction price that is less than the asset group's carrying amount, or an estimate of undiscounted future cash flows attributable to the asset group, as compared with the carrying amount of the assets. If an impairment has occurred, the amount of the impairment loss recognized is determined by either the amount of regulatory disallowance or by the amount the carrying amount exceeds the estimated fair value of the assets. For assets identified as held for sale, the carrying amount is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change. See Notes 7 and 9 under "Southern Company Gas" and "Southern Company Leveraged Lease," respectively, and Note 15 under "Southern Company" and "Southern Company Gas" for information regarding impairment charges recorded during the periods presented.
Goodwill and Other Intangible Assets
Southern Power's intangible assets consist primarily of certain PPAs acquired, which are amortized over the term of the respective PPA. Southern Company Gas' goodwill and other intangible assets primarily relate to its 2016 acquisition by Southern Company. In addition to these items, Southern Company's goodwill and other intangible assets also relate to its 2016 acquisition of PowerSecure.
For its 2023 and 2022 annual impairment tests, Southern Company Gas management performed the qualitative assessment and determined that it was more likely than not that the fair value of all of its reporting units with goodwill exceeded their carrying amounts, and therefore no quantitative assessment was required. For its 2021 annual impairment test, Southern Company Gas management performed the quantitative assessment and confirmed that the fair values of all of its reporting units with goodwill exceeded their carrying amounts.
For its 2023 and 2021 annual impairment tests, PowerSecure management performed the quantitative assessment, which resulted in the fair value of PowerSecure exceeding its carrying amount. For its 2022 annual impairment test, PowerSecure management performed the quantitative assessment, which resulted in the fair value of PowerSecure being lower than its carrying amount. The fair value was estimated using a discounted cash flow analysis. The decline in fair value primarily resulted from declining macroeconomic conditions, reducing sales growth and estimated cash flows. As a result, a goodwill impairment of $119 million was recorded in the fourth quarter 2022.
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At December 31, 2023 and 2022, goodwill was as follows:
At December 31, 2023At December 31, 2022
(in millions)
Southern Company$5,161 $5,161 
Southern Company Gas:
Gas distribution operations$4,034 $4,034 
Gas marketing services981 981 
Southern Company Gas total$5,015 $5,015 
At December 31, 2023 and 2022, other intangible assets were as follows:
At December 31, 2023At December 31, 2022
Gross Carrying AmountAccumulated AmortizationOther
Intangible Assets, Net
Gross Carrying AmountAccumulated AmortizationOther
Intangible Assets, Net
(in millions)(in millions)
Southern Company
Subject to amortization:
Customer relationships$212 $(172)$40 $212 $(162)$50 
Trade names64 (53)11 64 (44)20 
PPA fair value adjustments390 (148)242 390 (129)261 
Other(3)— (5)— 
Total subject to amortization$669 $(376)$293 $671 $(340)$331 
Not subject to amortization:
FCC licenses75 — 75 75 — 75 
Total other intangible assets$744 $(376)$368 $746 $(340)$406 
Southern Power(*)
PPA fair value adjustments$390 $(148)$242 $390 $(129)$261 
Southern Company Gas(*)
Gas marketing services
Customer relationships$156 $(145)$11 $156 $(139)$17 
Trade names26 (21)26 (17)
Total other intangible assets$182 $(166)$16 $182 $(156)$26 
(*)All subject to amortization.
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Amortization associated with other intangible assets in 2023, 2022, and 2021 was as follows:
202320222021
(in millions)
Southern Company(a)
$38 $39 $44 
Southern Power(b)
20 20 20 
Southern Company Gas:
Gas marketing services10 11 15 
(a)Includes $20 million annually recorded as a reduction to operating revenues.
(b)Recorded as a reduction to operating revenues.
At December 31, 2023, the estimated amortization associated with other intangible assets for the next five years is as follows:
20242025202620272028
(in millions)
Southern Company$35 $32 $27 $24 $24 
Southern Power20 20 20 20 20 
Southern Company Gas— — 
Acquisition Accounting
At the time of an acquisition, management will assess whether acquired assets and activities meet the definition of a business. Acquisitions that meet the definition of a business are accounted for under the acquisition method, and operating results from the date of acquisition are included in the acquiring entity's financial statements. Identifiable assets acquired, liabilities assumed, and any noncontrolling interests (including any intangible assets) are recognized and measured at fair value. Assets acquired that do not meet the definition of a business are accounted for as an asset acquisition. The purchase price of each asset acquisition is allocated based on the relative fair value of assets acquired.
Determining the fair value of assets acquired and liabilities assumed requires management judgment and management may engage independent valuation experts to assist in this process. Fair values are determined by using market participant assumptions and typically include the timing and amounts of future cash flows, incurred construction costs, the nature of acquired contracts, discount rates, power market prices, and expected asset lives. For potential or successful acquisitions that meet the definition of a business, any due diligence or transaction costs incurred are expensed as incurred. If the acquisition is an asset acquisition, direct and incremental transaction costs can be capitalized as a component of the cost of the assets acquired.
Historically, any contingent consideration relates to fixed amounts due to the seller once an acquired construction project is placed in service. For contingent consideration with variable payments, management fair values the arrangement with any changes recorded in the statements of income. See Note 13 for additional fair value information.
Development Costs
For Southern Power, development costs are capitalized once a project is probable of completion, primarily based on a review of its economics and operational feasibility, as well as the status of power off-take agreements and regulatory approvals, if applicable. Southern Power's capitalized development costs are included in CWIP on the balance sheets. All of Southern Power's development costs incurred prior to the determination that a project is probable of completion are expensed as incurred and included in other operations and maintenance expense in the statements of income. If it is determined that a project is no longer probable of completion, any of Southern Power's capitalized development costs are expensed and included in other operations and maintenance expense in the statements of income.
Long-Term Service Agreements
The traditional electric operating companies and Southern Power have entered into LTSAs for the purpose of securing maintenance support for certain of their generating facilities. The LTSAs cover all planned inspections on the covered equipment, which generally includes the cost of all labor and materials. The LTSAs also obligate the counterparties to cover the costs of unplanned maintenance on the covered equipment subject to limits and scope specified in each contract.
Payments made under the LTSAs for the performance of any planned inspections or unplanned capital maintenance are recorded in the statements of cash flows as investing activities. Receipts of major parts into materials and supplies inventory prior to planned inspections are treated as noncash transactions in the statements of cash flows. Any payments made prior to the work
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being performed are recorded as prepayments in other current assets and noncurrent assets on the balance sheets. At the time work is performed, an appropriate amount is accrued for future payments or transferred from the prepayment and recorded as property, plant, and equipment or expensed.
Transmission Receivables/Prepayments
As a result of Southern Power's acquisition and construction of generating facilities, Southern Power has transmission receivables and/or prepayments representing the portion of interconnection network and transmission upgrades that will be reimbursed to Southern Power. Upon completion of the related project, transmission costs are generally reimbursed by the interconnection provider within a five-year period and the receivable/prepayments are reduced as payments or services are received.
Cash, Cash Equivalents, and Restricted Cash
For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets that total to the amount shown in the statements of cash flows for the applicable Registrants:
Southern
Company
Alabama PowerGeorgia
Power
Southern
Power
Southern
Company Gas
(in millions)
At December 31, 2023
Cash and cash equivalents$748 $324 $$124 $33 
Restricted cash(a):
Other current assets141 85 37 17 
Other deferred charges and assets31 — 29 — 
Total cash, cash equivalents, and restricted cash(b)
$921 $409 $75 $144 $35 
At December 31, 2022
Cash and cash equivalents$1,917 $687 $364 $131 $81 
Restricted cash(a):
Other current assets62 — 60 — 
Other deferred charges and assets58 — 56 — 
Total cash, cash equivalents, and restricted cash(b)
$2,037 $687 $480 $133 $83 
(a)For Alabama Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2023. For Georgia Power, reflects proceeds from the issuance of solid waste disposal facility revenue bonds in 2022. See Note 8 under "Long-term Debt" for additional information. For Southern Power, reflects $17 million at December 31, 2023 resulting from an arbitration award held to fund future replacement costs and $3 million at both December 31, 2023 and 2022 held to fund estimated construction completion costs at the Deuel Harvest wind facility. See Note 3 under "General Litigation Matters – Southern Power" and Note 15 under "Southern Power" for additional information. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance.
(b)Total may not add due to rounding.
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Storm Damage and Reliability Reserves
In accordance with their respective state PSC orders, the traditional electric operating companies accrue certain amounts annually related to storm damage recovery. Each traditional electric operating company maintains a reserve to cover or is allowed to defer and recover the cost of damages from major storms to its transmission and distribution lines and, for Mississippi Power, the cost of uninsured damages to its generation facilities and other property. Alabama Power also has authority from the Alabama PSC to accrue certain additional amounts as circumstances warrant. Alabama Power recorded an additional accrual of $65 million in 2021.
Storm damage reserve activity for the traditional electric operating companies during 2023 was as follows:
Southern
Company
Alabama PowerGeorgia PowerMississippi
Power
 (in millions)
Balance at December 31, 2022$216 $97 $83 $36 
Accrual61 18 31 12 
Weather-related damages(211)(39)(168)(4)
Balance at December 31, 2023$66 $76 $(54)$44 
The traditional electric operating companies accrued the following amounts related to storm damage recovery in 2022 and 2021:
Southern
Company(a)(b)
Alabama
Power
(a)
Georgia
Power
Mississippi
Power(b)
(in millions)
2022$239 $19 $213 $
2021286 75 213 (2)
(a)Alabama Power's 2021 amount includes the $65 million additional accrual discussed above.
(b)Mississippi Power's net accrual includes carrying costs, as well as amortization of related excess deferred income tax benefits.
In 2022, costs for weather-related damages charged against storm damage reserves totaled $24 million and $82 million for Alabama Power and Georgia Power, respectively, and were immaterial for Mississippi Power.
See Note 2 under "Alabama Power – Rate NDR," "Georgia Power – Storm Damage Recovery," and "Mississippi Power – System Restoration Rider" for additional information regarding each company's storm damage reserve.
During 2022, the Alabama PSC and the Mississippi PSC authorized Alabama Power and Mississippi Power, respectively, to make accruals to a reliability reserve if certain conditions are met. During 2023 and 2022, Alabama Power and Mississippi Power accrued the following amounts to their reliability reserves:
Southern
Company
Alabama
Power
Mississippi
Power
(in millions)
2023$63 $52 $11 
2022191 166 25 
See Note 2 under "Alabama Power – Reliability Reserve Accounting Order" and "Mississippi Power – Reliability Reserve Accounting Order" for additional information.
Materials and Supplies
Materials and supplies for the traditional electric operating companies generally includes the average cost of transmission, distribution, and generating plant materials. Materials and supplies for Southern Company Gas generally includes propane gas inventory, liquefied natural gas inventory, fleet fuel, and other materials and supplies. Materials and supplies for Southern Power generally includes the average cost of generating plant materials.
Materials are recorded to inventory when purchased and then expensed or capitalized to property, plant, and equipment, as appropriate, at weighted average cost when installed. In addition, certain major parts are recorded as inventory when acquired and then capitalized at cost when installed to property, plant, and equipment.
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Fuel Inventory
Fuel inventory for the traditional electric operating companies includes the average cost of coal, natural gas, oil, transportation, and emissions allowances. Fuel inventory for Southern Power, which is included in other current assets, includes the average cost of oil, natural gas, and emissions allowances. Fuel is recorded to inventory when purchased and then expensed, at weighted average cost, as used. Emissions allowances granted by the EPA are included in inventory at zero cost. The traditional electric operating companies recover fuel expense through fuel cost recovery rates approved by each state PSC or, for wholesale rates, the FERC.
Natural Gas for Sale
With the exception of Nicor Gas, Southern Company Gas records natural gas inventories on a weighted average cost of gas basis. In Georgia's deregulated, competitive environment, Marketers sell natural gas to firm end-use customers at market-based prices. On a monthly basis, Atlanta Gas Light assigns to Marketers the majority of the pipeline storage services that it has under contract, along with a corresponding amount of inventory. Atlanta Gas Light retains and manages a portion of its pipeline storage assets and related natural gas inventories for system balancing and to serve system demand.
Nicor Gas' natural gas inventory is carried at cost on a LIFO basis. Inventory decrements occurring during the year that are restored prior to year-end are charged to cost of natural gas at the estimated annual replacement cost. Inventory decrements that are not restored prior to year-end are charged to cost of natural gas at the actual LIFO cost of the inventory layers liquidated. The cost of natural gas, including inventory costs, is recovered from customers under a purchased gas recovery mechanism adjusted for differences between actual costs and amounts billed; therefore, LIFO liquidations have no impact on Southern Company's or Southern Company Gas' net income. At December 31, 2023, the Nicor Gas LIFO inventory balance was $186 million. Based on the average cost of gas purchased in December 2023, the estimated replacement cost of Nicor Gas' inventory at December 31, 2023 was $268 million.
Provision for Uncollectible Accounts
The customers of the traditional electric operating companies and the natural gas distribution utilities are billed monthly. For the majority of receivables, a provision for uncollectible accounts is established based on historical collection experience and other factors. For the remaining receivables, if the company is aware of a specific customer's inability to pay, a provision for uncollectible accounts is recorded to reduce the receivable balance to the amount reasonably expected to be collected. If circumstances change, the estimate of the recoverability of accounts receivable could change as well. Circumstances that could affect this estimate include, but are not limited to, customer credit issues, customer deposits, and general economic conditions. Customers' accounts are written off once they are deemed to be uncollectible. For all periods presented, uncollectible accounts averaged less than 1% of revenues for each Registrant.
Credit risk exposure at Nicor Gas is mitigated by a bad debt rider approved by the Illinois Commission. The bad debt rider provides for the recovery from (or refund to) customers of the difference between Nicor Gas' actual bad debt experience on an annual basis and the benchmark bad debt expense used to establish its base rates for the respective year.
Concentration of Credit Risk
Concentration of credit risk occurs at Atlanta Gas Light for amounts billed for services and other costs to its customers, which consist of 13 Marketers in Georgia (including SouthStar). The credit risk exposure to the Marketers varies seasonally, with the lowest exposure in the non-peak summer months and the highest exposure in the peak winter months. Marketers are responsible for the retail sale of natural gas to end-use customers in Georgia. The functions of the retail sale of gas include the purchase and sale of natural gas, customer service, billings, and collections. The provisions of Atlanta Gas Light's tariff allow Atlanta Gas Light to obtain credit security support in an amount equal to a minimum of two times a Marketer's highest month's estimated bill from Atlanta Gas Light.
Financial Instruments
The traditional electric operating companies and Southern Power use derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, electricity purchases and sales, and occasionally foreign currency exchange rates. Southern Company Gas uses derivative financial instruments to limit exposure to fluctuations in natural gas prices, weather, interest rates, and commodity prices. All derivative financial instruments are recognized as either assets or liabilities on the balance sheets (included in "Other" or shown separately as "Risk Management Activities") and are measured at fair value. See Note 13 for additional information regarding fair value. Substantially all of the traditional electric operating companies' and Southern Power's bulk energy purchases and sales contracts that meet the definition of a derivative are excluded from fair value accounting requirements because they qualify for the "normal" scope exception, and are accounted for under the accrual method. Derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the
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traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs result in the deferral of related gains and losses in AOCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recorded on a net basis in the statements of income. Cash flows from derivatives are classified on the statements of cash flows in the same category as the hedged item. See Note 14 for additional information regarding derivatives.
The Registrants offset fair value amounts recognized for multiple derivative instruments executed with the same counterparty under netting arrangements. The Registrants had no outstanding collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2023.
The Registrants are exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Registrants have established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate their exposure to counterparty credit risk.
Southern Company Gas
Southern Company Gas enters into weather derivative contracts as economic hedges of natural gas revenues in the event of warmer-than-normal weather in the Heating Season. Exchange-traded options are carried at fair value, with changes reflected in natural gas revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are also reflected in natural gas revenues in the statements of income.
Southern Company Gas enters into transactions to secure transportation capacity between delivery points in order to serve its customers and various markets. NYMEX futures and OTC contracts are used to capture the price differential or spread between the locations served by the capacity to substantially protect the natural gas revenues that will ultimately be realized when the physical flow of natural gas between delivery points occurs. These contracts generally meet the definition of derivatives and are carried at fair value on the balance sheets, with changes in fair value included in earnings in the period of change. These contracts are not designated as hedges for accounting purposes.
The purchase, transportation, storage, and sale of natural gas are accounted for on a weighted average cost or accrual basis, as appropriate, rather than on the fair value basis utilized for the derivatives used to mitigate the natural gas price risk associated with the storage and transportation portfolio. Monthly demand charges are incurred for the contracted storage and transportation capacity and payments associated with asset management agreements, and these demand charges and payments are recognized on the statements of income in the period they are incurred. This difference in accounting methods can result in volatility in reported earnings, even though the economic margin is substantially unchanged from the dates the transactions were consummated.
Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income attributable to the Registrant, changes in the fair value of qualifying cash flow hedges, and reclassifications for amounts included in net income. Comprehensive income also consists of certain changes in pension and other postretirement benefit plans for Southern Company, Southern Power, and Southern Company Gas.
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AOCI (loss) balances, net of tax effects, for Southern Company, Southern Power, and Southern Company Gas were as follows:
Qualifying
Hedges
Pension and Other
Postretirement
Benefit Plans
Accumulated Other
Comprehensive
Income (Loss)(*)
(in millions)
Southern Company
Balance at December 31, 2022$(149)$(18)$(167)
Current period change28 (38)(10)
Balance at December 31, 2023$(121)$(56)$(177)
Southern Power
Balance at December 31, 2022$(9)$(9)$(18)
Current period change(7)
Balance at December 31, 2023$(1)$(16)$(17)
Southern Company Gas
Balance at December 31, 2022$(25)$56 $31 
Current period change(16)(15)
Balance at December 31, 2023$(24)$40 $16 
(*)May not add due to rounding.
Variable Interest Entities
The Registrants may hold ownership interests in a number of business ventures with varying ownership structures. Partnership interests and other variable interests are evaluated to determine if each entity is a VIE. The primary beneficiary of a VIE is required to consolidate the VIE when it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. See Note 7 for additional information regarding VIEs.
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2. REGULATORY MATTERS
Regulatory Assets and Liabilities
Details of regulatory assets and (liabilities) reflected in the balance sheets at December 31, 2023 and 2022 are provided in the following tables:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern Company Gas
(in millions)
At December 31, 2023
AROs(a)(w)
$5,733 $1,936 $3,505 $247 $— 
Retiree benefit plans(b)(w)
3,011 815 976 140 146 
Remaining net book value of retired assets(c)
1,357 499 841 17 — 
Deferred income tax charges(d)
897 262 605 28 — 
Under recovered regulatory clause revenues(e)
413 381 — 12 20 
Fuel-hedging (realized and unrealized) losses(f)
270 100 121 49 — 
Deferred depreciation(g)
270 143 127 — — 
Environmental remediation(h)(w)
255 — 20 — 235 
Loss on reacquired debt(i)
238 35 197 
Vacation pay(j)(w)
217 83 107 11 16 
Software and cloud computing costs(k)
150 59 84 
Regulatory clauses(l)
140 112 — — 28 
Storm damage(m)
92 — 54 38 — 
Nuclear outage(n)
83 50 33 — — 
Long-term debt fair value adjustment(o)
60 — — — 60 
Qualifying repairs of natural gas distribution systems(p)
40 — — — 40 
Plant Daniel Units 3 and 4(q)
25 — — 25 — 
Kemper County energy facility assets, net(r)
— — — 
Other regulatory assets(s)
182 39 33 18 93 
Deferred income tax credits(d)
(4,686)(1,506)(2,161)(241)(759)
Other cost of removal obligations(a)
(1,312)28 617 (186)(1,771)
Over recovered regulatory clause revenues(e)
(287)(3)(46)— (238)
Reliability reserves(t)
(179)(143)— (36)— 
Storm/property damage reserves(t)
(120)(76)— (44)— 
Customer refunds(u)
(19)(15)(4)— — 
Fuel-hedging (realized and unrealized) gains(f)
(6)(5)(1)— 
Other regulatory liabilities(v)
(308)(74)(18)(2)(101)
Total regulatory assets (liabilities), net$6,523 $2,720 $5,090 $90 $(2,225)
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Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern Company Gas
(in millions)
At December 31, 2022
AROs(a)(w)
$6,096 $1,971 $3,829 $242 $— 
Retiree benefit plans(b)(w)
2,517 675 848 113 114 
Remaining net book value of retired assets(c)
1,543 562 962 19 — 
Under recovered regulatory clause revenues(e)
953 788 — 31 134 
Deferred income tax charges(d)
866 250 583 30 — 
Environmental remediation(h)(w)
294 — 25 — 269 
Loss on reacquired debt(i)
257 38 213 
Vacation pay(j)(w)
212 82 108 10 12 
Regulatory clauses(l)
142 142 — — — 
Software and cloud computing costs(k)
111 46 59 — 
Nuclear outage(n)
82 52 30 — — 
Long-term debt fair value adjustment(o)
69 — — — 69 
Fuel-hedging (realized and unrealized) losses(f)
60 15 45 — — 
Storm damage(m)
44 — — 44 — 
Plant Daniel Units 3 and 4(q)
27 — — 27 — 
Qualifying repairs of natural gas distribution systems(p)
26 — — — 26 
Kemper County energy facility assets, net(r)
20 — — 20 — 
Other regulatory assets(s)
171 36 27 16 92 
Deferred income tax credits(d)
(5,251)(1,925)(2,244)(269)(788)
Other cost of removal obligations(a)
(1,430)11 462 (196)(1,707)
Storm/property damage reserves(t)
(216)(97)(83)(36)— 
Reliability reserves(t)
(191)(166)— (25)— 
Customer refunds(u)
(183)(62)(121)— — 
Fuel-hedging (realized and unrealized) gains(f)
(83)(38)(21)(24)— 
Over recovered regulatory clause revenues(e)
(64)— (38)— (26)
Other regulatory liabilities(v)
(239)(40)(21)(3)(93)
Total regulatory assets (liabilities), net$5,833 $2,340 $4,663 $$(1,891)
Unless otherwise noted, the following recovery and amortization periods for these regulatory assets and (liabilities) have been approved by the respective state PSC or regulatory agency:
(a)AROs and other cost of removal obligations generally are recorded over the related property lives, which may range up to 64 years for Alabama Power, 56 years for Georgia Power, 55 years for Mississippi Power, and 85 years for Southern Company Gas. AROs and cost of removal obligations are settled and trued up following completion of the related activities. Alabama Power is recovering CCR ARO expenditures over a 38-year period ending in 2054 through Rate CNP Compliance. Effective January 1, 2023, Georgia Power is recovering CCR ARO expenditures over four-year periods through its ECCR tariff. Prior to 2023, expenditures were recovered over three-year periods. See "Georgia Power – Rate Plans" herein and Note 6 for additional information.
(b)Recovered and amortized over the average remaining service period, which may range up to 13 years for Alabama Power and Mississippi Power and up to 14 years for Georgia Power and Southern Company Gas. Southern Company's balances also include amounts at SCS and Southern Nuclear that are allocated to the applicable regulated utilities. See Note 11 for additional information.
(c)Alabama Power: Primarily represents the net book value of Plant Gorgas Unit 10 ($451 million at December 31, 2023) being amortized over 14 years (through 2037) and Plant Barry Unit 4 ($39 million at December 31, 2023) being amortized over 11 years (through 2034). See "Alabama Power – Environmental Accounting Order" herein for additional information.
Georgia Power: Net book values of Plant Wansley Units 1 and 2, Plant Hammond Units 1 through 4, and Plant Branch Unit 4 (totaling $488 million, $339 million, and $8 million, respectively, at December 31, 2023) are being amortized over remaining periods between one and 12 years (between 2024 and 2035). Balance also includes unusable materials and supplies inventories, for which the Georgia PSC will determine a recovery period in a future base rate case.
Mississippi Power: Represents net book value of certain environmental compliance assets at Plant Watson and Plant Greene County. The retail portion is being amortized over a 10-year period through 2030 and the wholesale portion is being amortized over a 14-year period through 2035. See "Mississippi Power – Environmental Compliance Overview Plan" herein for additional information.
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(d)Deferred income tax charges are recovered and deferred income tax credits are primarily amortized over the related property lives, which may range up to 64 years for Alabama Power, 56 years for Georgia Power, 55 years for Mississippi Power, and 85 years for Southern Company Gas. See Note 10 for additional information. As a result of the Tax Reform Legislation, these accounts include certain deferred income tax assets and liabilities not subject to normalization, as described further below:
Alabama Power: Related amounts at December 31, 2023 include excess federal deferred income tax liabilities that are available for the benefit of customers in 2024 and/or 2025, as discussed under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" herein. Remaining amounts are being recovered and amortized ratably over the related property lives.
Georgia Power: Related amounts include $145 million of deferred income tax assets related to construction costs for Plant Vogtle Units 3 and 4 to be recovered over a 10-year period beginning the month after Unit 4 achieves commercial operation. See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4.
Mississippi Power: Related amounts include retail deferred income tax liabilities ($11 million at December 31, 2023) that are expected to be fully amortized through 2024.
Southern Company Gas: Related amounts include deferred income tax liabilities ($1 million at December 31, 2023) being amortized through 2024. See "Southern Company Gas – Rate Proceedings" herein for additional information.
(e)Alabama Power: Balances are recorded monthly and expected to be recovered over periods of up to seven years, with the majority expected to be recovered within one year. See "Alabama Power – Rate CNP PPA," " – Rate CNP Compliance," and " – Rate ECR" herein for additional information.
Georgia Power: Balances are recorded monthly and expected to be recovered or returned within two years. See "Georgia Power – Rate Plans" herein for additional information.
Mississippi Power: At December 31, 2023, $12 million is expected to be recovered through various rate recovery mechanisms over a period to be determined in future rate filings. See "Mississippi Power – Ad Valorem Tax Adjustment" herein for additional information.
Southern Company Gas: Balances are recorded and recovered or amortized over periods generally not exceeding five years. In addition to natural gas cost recovery mechanisms, the natural gas distribution utilities have various other cost recovery mechanisms for the recovery of costs, including those related to infrastructure replacement programs.
(f)Fuel-hedging assets and liabilities are recorded over the life of the underlying hedged purchase contracts. Upon final settlement, actual costs incurred are recovered through the applicable traditional electric operating company's fuel cost recovery mechanism. Purchase contracts generally do not exceed three and a half years for Alabama Power, three years for Georgia Power, and four years for Mississippi Power.
(g)Alabama Power: Represents deferred depreciation expense for Plant Barry Unit 5 ($57 million at December 31, 2023) and Plant Barry common coal assets ($24 million at December 31, 2023) to be amortized until 2036 beginning when Plant Barry Unit 5 is retired and Plant Gaston Unit 5 coal assets ($62 million at December 31, 2023) to be amortized until 2039 beginning when the assets are retired.
Georgia Power: Represents deferred depreciation expense for Plant Scherer Units 1 through 3 ($70 million at December 31, 2023) to be amortized over six years beginning in 2029 and Plant Bowen Units 1 and 2 ($40 million at December 31, 2023) to be amortized over four years beginning in 2031, both as approved under Georgia Power's 2022 ARP, and Plant Vogtle Unit 3 and common facilities ($17 million at December 31, 2023) to be amortized over a 10-year period beginning the month after Plant Vogtle Unit 4 achieves commercial operation. See "Georgia Power – Nuclear Construction – Regulatory Matters" herein for additional information on recovery of costs related to Plant Vogtle Units 3 and 4.
(h)Effective January 1, 2023, Georgia Power is recovering $5 million annually for environmental remediation under the 2022 ARP. Southern Company Gas' costs are recovered through environmental cost recovery mechanisms when the remediation work is performed. See Note 3 under "Environmental Remediation" for additional information.
(i)Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue. At December 31, 2023, the remaining amortization periods do not exceed 24 years for Alabama Power, 29 years for Georgia Power, 18 years for Mississippi Power, and four years for Southern Company Gas.
(j)Recorded as earned by employees and recovered as paid, generally within one year. Includes both vacation and banked holiday pay, if applicable.
(k)Represents certain deferred operations and maintenance costs associated with software and cloud computing projects. For Alabama Power, costs are amortized ratably over the life of the related software, which ranges up to 10 years (through 2034). See "Alabama Power – Software Accounting Order" herein for additional information. For Georgia Power, costs incurred through 2022 are being amortized over five years (through 2027) and the recovery period for costs incurred after 2022 will be determined in its next base rate case. For Mississippi Power, the recovery period will be determined in Mississippi Power's annual PEP filing process. For Southern Company Gas, costs are being amortized ratably over the life of the related software, which ranges up to 10 years (through 2034).
(l)Alabama Power: Effective January 1, 2023, balance is being amortized through Rate RSE over a five-year period ending in 2027.
Southern Company Gas: Represents amounts related to Nicor Gas' volume balancing adjustment rider expected to be recovered over a period of less than two years.
(m)See "Georgia Power – Storm Damage Recovery" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information. Mississippi Power's balance represents deferred storm costs associated with Hurricanes Ida and Zeta being recovered through PEP over a seven-year period through 2029.
(n)Nuclear outage costs are deferred to a regulatory asset when incurred and amortized over a subsequent period of 18 months for Alabama Power and up to 24 months for Georgia Power. See Note 5 for additional information.
(o)Recovered over the remaining lives of the original debt issuances at acquisition, which range up to 15 years at December 31, 2023.
(p)Represents deferred costs of certain repairs at Atlanta Gas Light being amortized over 20 years.
(q)Represents the difference between Mississippi Power's revenue requirement for Plant Daniel Units 3 and 4 under purchase accounting and operating lease accounting. At December 31, 2023, consists of the $17 million retail portion being amortized through 2039 over the remaining life of the related property and the $8 million wholesale portion being amortized through 2035.
(r)At December 31, 2023, includes $9 million of regulatory assets (wholesale) expected to be fully amortized by 2035 and $2 million of regulatory liabilities (retail) expected to be fully amortized by 2024.
(s)Comprised of numerous immaterial components with remaining amortization periods at December 31, 2023 generally not exceeding 20 years for Alabama Power, 10 years for Georgia Power, 14 years for Mississippi Power, and 15 years for Southern Company Gas.
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(t)Utilized as related expenses are incurred. See "Alabama Power – Rate NDR" and " – Reliability Reserve Accounting Order," "Georgia Power – Storm Damage Recovery," and "Mississippi Power – System Restoration Rider" and " – Reliability Reserve Accounting Order" herein and Note 1 under "Storm Damage and Reliability Reserves" for additional information.
(u)Primarily includes approximately $15 million and $62 million at December 31, 2023 and 2022, respectively, for Alabama Power and $119 million at December 31, 2022 for Georgia Power as a result of each company exceeding its allowed retail return range. Georgia Power's balances also include immaterial amounts related to refunds for transmission service customers. See "Alabama Power – Rate RSE" and "Georgia Power – Rate Plans" herein for additional information.
(v)Comprised of numerous immaterial components with remaining amortization periods at December 31, 2023 generally not exceeding 11 years for Alabama Power, nine years for Georgia Power, four years for Mississippi Power, and 20 years for Southern Company Gas.
(w)Generally not earning a return as they are excluded from rate base or are offset in rate base by a corresponding asset or liability.
Alabama Power
Alabama Power's revenues from regulated retail operations are collected through various rate mechanisms subject to the oversight of the Alabama PSC. The CompanyAlabama Power currently recovers its costs from the regulated retail business primarily through Rate RSE, Rate CNP, Rate ECR, and Rate NDR. In addition, the Alabama PSC issues accounting orders to address current events impacting Alabama Power.
Renewable Generation Certificate
Through the Company. See Note 1issuance of a Renewable Generation Certificate (RGC), Alabama Power is authorized by the Alabama PSC to procure renewable capacity and energy and to market the financial statementsrelated energy and Note 3environmental attributes to customers and other third parties. On April 4, 2023, the financial statementsAlabama PSC approved two new solar PPAs totaling 160 MWs. Upon approval of these PPAs, Alabama Power had procured solar capacity totaling approximately 490 MWs under "Retail Regulatory Matters" forthe RGC's original 500-MW limit.
On June 14, 2023, the Alabama PSC issued an order approving modifications to Alabama Power's RGC. The modifications authorized Alabama Power to procure an additional information regarding2,400 MWs of renewable capacity and energy by June 14, 2029 and to market the Company's rate mechanismsrelated energy and accounting orders.environmental attributes to customers and other third parties. The modifications also increased the size of allowable renewable projects from 80 MWs to 200 MWs and increased the annual approval limit from 160 MWs to 400 MWs.
Rate RSE
The Alabama PSC has adopted Rate RSE that provides for periodic annual adjustments based upon the Company'sAlabama Power's projected weighted cost ofcommon equity (WCE)return (WCER) compared to an allowable range. Rate RSE adjustments are based on forward-looking information for the applicable upcoming calendar year. Rate RSE adjustments for any two-year period, when averaged together, cannot exceed 4.0% and any annual adjustment is limited to 5.0%. IfWhen the Company's actual retail returnprojected WCER is aboveunder the allowed WCE range, there is an adjusting point of 5.98% and eligibility for a performance-based adder of seven basis points, or 0.07%, to the excess will be refundedWCER adjusting point if Alabama Power (i) has an "A" credit rating equivalent with at least one of the recognized rating agencies or (ii) is in the top one-third of a designated customer value benchmark survey.
Alabama Power continues to customers unless otherwise directedreduce growth in total debt by increasing equity, with corresponding reductions in debt issuances, thereby de-leveraging its capital structure. Alabama Power's goal is to achieve an equity ratio of approximately 55% by the end of 2025. At December 31, 2023 and 2022, Alabama PSC; however, therePower's equity ratio was approximately 52.3% and 52.2%, respectively.
Generally, during a year without a Rate RSE upward adjustment, if Alabama Power's actual WCER is between 6.15% and 7.65%, customers will receive 25% of the amount between 6.15% and 6.65%, 40% of the amount between 6.65% and 7.15%, and 75% of the amount between 7.15% and 7.65%. Customers will receive all amounts in excess of an actual WCER of 7.65%. During a year with a Rate RSE upward adjustment, if Alabama Power's actual WCER exceeds 6.15%, customers receive 50% of the amount between 6.15% and 6.90% and all amounts in excess of an actual WCER of 6.90%. Alabama Power's ability to retain a portion of the revenue that causes the actual WCER for a given year to exceed the allowed range positions Alabama Power to address the pressure on its credit quality, without increasing retail rates under Rate RSE in the near term. There is no provision for additional customer billings should the actual retail return fall below the WCEWCER range.
AtRetail rates under Rate RSE did not change for 2022 or 2023.
For the years ended December 31, 2016, the Company's retail return2021, 2022, and 2023, Alabama Power's WCER exceeded the allowed WCE range which resulted6.15%, resulting in the CompanyAlabama Power establishing a $73current regulatory liability of $181 million, $62 million, and $15 million, respectively, for Rate RSE refunds. In accordance with an Alabama PSC order issued in February 2022, Alabama Power applied $126 million of the 2021 refund liability.to reduce the Rate ECR under recovered balance and the remaining $55 million was refunded to customers through bill credits in July 2022. In accordance with an Alabama PSC order issued on February 14, 2017,7, 2023, Alabama Power refunded the Company applied the full2022 amount of the refund to reduce the under recovered balance of Rate CNP PPA as discussed further below.
Effectivecustomers through bill credits in January 2017, Rate RSE increased 4.48%, or $245August 2023. The $15 million annually. Atregulatory liability at December 31, 2017, the Company's actual retail return was within the allowed WCE range. 2023 will be refunded to customers through bill credits in April 2024.
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On December 1, 2017, the Company2023, Alabama Power made its required annual Rate RSE submission to the Alabama PSC of projected data for calendar year 2018.2024. Projected earnings were within the specified range; therefore, retail rates under Rate RSE remainedremain unchanged for 2018.2024.
Excess Accumulated Deferred Income Tax Accounting Order
In conjunctionDecember 2022, the Alabama PSC directed Alabama Power to accelerate the amortization of a regulatory liability associated with Rate RSE, the Company has an established retail tariff that provides for an adjustmentexcess federal accumulated deferred income taxes. Under this order, in 2023, approximately $304 million was returned to customer billingscustomers through bill credits to recognizeoffset the impact of the rate increase discussed under "Rate CNP Depreciation" herein.
On October 3, 2023, the Alabama PSC issued an order modifying its December 2022 order and authorizing Alabama Power to (i) flow back in 2023 approximately $24 million of certain federal excess accumulated deferred income taxes resulting from the Tax Cuts and Jobs Act of 2017 and (ii) make available any remaining balance of excess accumulated deferred income taxes at the end of 2023 for the benefit of customers in 2024 and/or 2025. At December 31, 2023, the remaining balance was $81 million, of which approximately $67 million and $14 million will flow back in 2024 and 2025, respectively, for the benefit of customers.
Rate CNP New Plant
Rate CNP New Plant allows for recovery of Alabama Power's retail costs associated with newly developed or acquired certificated generating facilities placed into retail service. No adjustments to Rate CNP New Plant occurred during the period January 2021 through October 2022.
In July 2022, the Alabama PSC approved a changeCCN authorizing Alabama Power to complete the acquisition of the Calhoun Generating Station. The transaction closed in September 2022 and, in October 2022, Alabama Power filed Rate CNP New Plant with the statutory income tax rate. AsAlabama PSC to recover the related costs. The filing reflected an increase in annual revenues of $34 million, or 0.6%, effective with November 2022 billings.
In 2020, the Alabama PSC approved a resultCCN authorizing Alabama Power to complete the acquisition of Tax Reform Legislation, the applicationCentral Alabama Generating Station, which occurred in August 2020. Through May 2023, Alabama Power recovered substantially all costs associated with the Central Alabama Generating Station through Rate RSE, offset by revenues from a power sales agreement. Beginning in July 2022, fuel costs associated with Central Alabama Generating Station are being recovered through Rate ECR. On March 24, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with the acquisition of this tariff would reducethe Central Alabama Generating Station. The filing reflected an annual increase in retail revenue byrevenues of $78 million, or 1.1%, effective with June 2023 billings. On May 24, 2023, the Central Alabama Generating Station was placed into retail service.
The Alabama PSC's 2020 CCN also authorized Alabama Power to construct an approximately $250720-MW combined cycle facility at Alabama Power's Plant Barry (Plant Barry Unit 8) and the recovery of estimated in-service costs. On November 1, 2023, the unit was placed in service. On December 1, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover the related costs. The filing reflected an annual increase in retail revenues of $91 million, over the remainder of 2018. The ultimate outcome of this matter cannot be determined at this time.or 1.4%, effective with January 2024 billings.
Rate CNP PPA
The Company's retail rates, approved by the Alabama PSC, provide for adjustments under Rate CNP to recognizePPA allows for the placingrecovery of new generating facilities into retail service. The Company may also recoverAlabama Power's retail costs associated with certificated PPAs under Rate CNP PPA. On March 7, 2017, the Alabama PSC issued a consent order that the Company leave in effect the currentPPAs. Revenues for Rate CNP PPA, factoras recorded on the financial statements, are adjusted for billings fordifferences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the period April 1, 2017 through March 31, 2018.billing factors will have no significant effect on Southern Company's or Alabama Power's revenues or net income but will affect annual cash flow. No adjustmentadjustments to Rate CNP PPA occurred during the period 2021 through 2023 and no adjustment is expected in 2018.
In accordance withfor 2024. At December 31, 2023 and 2022, Alabama Power had an accounting order issued on February 17, 2017 by the Alabama PSC, the Company eliminated the under recovered balance in Rate CNP PPA at December 31, 2016,balance of $103 million and $120 million, respectively, of which totaled approximately $142 million. As discussed herein under "Rate RSE,"$18 million and $18 million, respectively, is included in other regulatory assets, current and $85 million and $102 million, respectively, is included in other regulatory assets, deferred on the Company utilized the full amount of its $73 million Rate RSE refund liability to reduce the amount of the Rate CNP PPA under recovery and reclassified the remaining $69 million to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of the Company's next depreciation study, which is expected to occur within the next two to four years. The Company's current depreciation study became effective January 1, 2017.balance sheet.
Rate CNP Compliance
Rate CNP Compliance allows for the recovery of the Company'sAlabama Power's retail costs associated with laws, regulations, and other such mandates directed at the utility industry involving the environment, security, reliability, safety, sustainability, or similar considerations impacting the Company'sAlabama Power's facilities or operations. Rate CNP Compliance is based on forward-looking information and provides for the recovery of these costs pursuant to a factorfactors that isare calculated annually.and submitted to the Alabama PSC by December 1 with rates effective for the following calendar year. Compliance costs to be recovered include operations and maintenance expenses, depreciation, and a return on certain invested capital. Revenues for Rate CNP Compliance, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factorfactors will have no significant effect on theSouthern Company's or Alabama Power's revenues
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or net income, but will affect annual cash flow. Changes in Rate CNP Compliance-related operations and maintenance expenses and depreciation generally will have no effect on net income.
In accordance with an accounting order issued on February 17, 2017 byNovember 2021, December 2022, and December 2023, Alabama Power submitted calculations to the Alabama PSC associated with its cost of complying with governmental mandates for the Company reclassified $36 million of itsfollowing calendar year, as provided under Rate CNP Compliance. The 2021 filing reflected a projected under recovered balance in Rate CNP Compliance to a separate regulatory asset. The amortizationretail revenue requirement of the new regulatory
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Alabama Power Company 2017 Annual Report

asset through Rate RSE will begin concurrently with the effective date of the Company's next depreciation study, which is expected to occur within the next two to four years. The Company's current depreciation study became effective January 1, 2017.
Onapproximately $59 million. In December 5, 2017,2021, the Alabama PSC issued a consent order that Alabama Power leave the Company leave2021 Rate CNP Compliance factors in effect for 2018 the factors associated with the Company's compliance costs for the year 2017,2022, with any under-collectedprior year under collected amount for prior years deemed recovered before any current year amounts. Anyamounts are recovered and any remaining under recovered amounts associated with 2018 will berecovery reflected in the 20192022 filing. The 2022 filing reflected a $255 million, or 3.7%, annual increase effective with January 2023 billings, primarily due to updated depreciation rates. The 2023 filing reflected a $23 million, or 0.3%, annual decrease effective with January 2024 billings.
At December 31, 2023, Alabama Power had an under recovered Rate CNP Compliance balance of $33 million, of which $8 million is included in other regulatory assets, current and $25 million is included in other regulatory assets, deferred on the balances sheet, compared to an under recovered balance at December 31, 2022 of $47 million included in other regulatory assets, current on the balance sheet.
Rate ECRCNP Depreciation
The Company has established energy cost recoveryIn December 2022, the Alabama PSC approved Rate CNP Depreciation, which allows Alabama Power to recover changes in depreciation resulting from updates to certain depreciation rates, underexcluding any depreciation recovered through Rate CNP New Plant, Rate CNP Compliance, or costs associated with the Company'scapitalization of asset retirement costs. Rate ECR asCNP Depreciation resulted in an annual revenue increase of approximately $318 million, or 4.6%, effective with January 2023 billings. See "Excess Accumulated Deferred Income Tax Accounting Order" herein for information related to 2023 customer bill credits approved by the Alabama PSC. Rates are
Rate ECR
Rate ECR recovers Alabama Power's retail energy costs based on an estimate of future energy costs and the current over or under recovered balance. Revenues recognized under Rate ECR and recorded on the financial statements are adjusted for the difference in actual recoverable fuel costs and amounts billed in current regulated rates. The difference in the recoverable fuel costs and amounts billed givegives rise to the over or under recovered amounts recorded as regulatory assets or liabilities. The Company,Alabama Power, along with the Alabama PSC, continually monitors the over or under recovered cost balance to determine whether an adjustment to billing rates is required. Changes in the Rate ECR factor have no significant effect on theSouthern Company's or Alabama Power's net income but will impact the related operating cash flows. Currently, theThe Alabama PSC may approve billing rates under Rate ECR of up to 5.910 cents per KWH.
In accordanceThe Alabama PSC approved adjustments to Rate ECR from 1.960 cents per KWH to 2.557 cents per KWH, or approximately $310 million annually, effective with an accounting order issued on February 17, 2017 byAugust 2022 billings and from 2.557 cents per KWH to 3.510 cents per KWH, or approximately $500 million annually, effective with December 2022 billings. On November 9, 2023, the Alabama PSC the Company reclassified $36 million of its under recovered balance inapproved a decrease to Rate ECR to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of the Company's next depreciation study, which is expected to occur within the next two to four years. The Company's current depreciation study became effective January 1, 2017.
On December 5, 2017, the Alabama PSC issued a consent order that the Company leave in effect for 2018 the energy cost recovery rates which began in 2017. Therefore, the Rate ECR factor as of January 1, 2018 remained at 2.015from 3.510 cents per KWH.KWH to 3.270 cents per KWH, or approximately $126 million annually, effective with December 2023 billings. The rate will returnadjust to 5.910 cents per KWH in 2019,January 2025 absent a further order from the Alabama PSC.
At December 31, 2023 and 2022, Alabama Power's under recovered fuel costs totaled $246 million and $622 million, respectively, of which $246 million and $102 million, respectively, is included in regulatory assets – under recovered retail fuel clause revenues and $520 million of the December 31, 2022 balance is included in other regulatory assets, deferred on the balance sheets. These classifications are based on estimates, which include such factors as weather, generation availability, energy demand, and the price of energy. A change in any of these factors could have a significant impact on the timing of any recovery or return of fuel costs.
Software Accounting Order
The Alabama PSC authorizes Alabama Power to establish a regulatory asset for operations and maintenance costs associated with software implementation projects. The regulatory asset is amortized ratably over the life of the related software. At December 31, 2023 and 2022, the regulatory asset balance totaled $59 million and $46 million, respectively, and is included in other regulatory assets, deferred on the balance sheet.
Plant Greene County
Alabama Power jointly owns Plant Greene County with an affiliate, Mississippi Power. See Note 5 under "Joint Ownership Agreements" for additional information. In 2021, the Mississippi PSC concluded its review of Mississippi Power's 2021 IRP,
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which included a schedule to retire Mississippi Power's 40% ownership interest in Plant Greene County Units 1 and 2 in December 2025 and 2026, respectively, consistent with each unit's remaining useful life. Alabama Power and Mississippi Power have continued to evaluate operating conditions and business needs relevant to the anticipated retirement of Plant Greene County and now expect the units to remain in service beyond the previously indicated dates. The Plant Greene County unit retirements require the completion by Alabama Power of transmission and system reliability improvements, as well as agreement by Alabama Power. The ultimate outcome of this matter cannot be determined at this time. See "Mississippi Power – Integrated Resource Plan" herein for additional information.
Rate NDR
Based on an order from the Alabama PSC, the CompanyAlabama Power maintains a reserve for operations and maintenance expenses to cover the cost of damages from major storms to its transmission and distribution facilities. The order approves a separate monthly Rate NDR charge to customers consisting of two components. The first component is intended to establish and maintain a reserve balance for future storms and is an on-going part of customer billing. When the reserve balance falls below $50 million, a reserve establishment charge will be activated (and the on-going reserve maintenance charge concurrently suspended) until the reserve balance reaches $75 million.
The second component of the Rate NDR charge is intended to allow recovery of any existing deferred storm-related operations and maintenance costs and any future reserve deficits over a 24-month period.48-month period (24-month period prior to modifications approved by the Alabama PSC in July 2022). The Alabama PSC order gives Alabama Power authority to record a deficit balance in the NDR when costs of storm damage exceed any established reserve balance. The maximum total Rate NDR charge was limited to $10.00 per month per non-residential customer account and $5.00 per month per residential customer account through July 12, 2022. Subsequently, modifications approved by the Alabama PSC replaced the maximum total Rate NDR charge with a maximum charge to recover a deficit of $5 per month per non-residential customer account and $2.50 per month per residential customer account. Alabama Power has the authority, based on an order from the Alabama PSC, to accrue certain additional amounts as circumstances warrant, which can be used to offset storm charges. Alabama Power made an additional accrual of $65 million in 2021.
In December 2017,Alabama Power collected approximately $12 million, $14 million, and $6 million in 2023, 2022, and 2021, respectively, under Rate NDR. Beginning with August 2022 billings, the reserve maintenanceestablishment charge was suspended and the reserve establishmentmaintenance charge was activated as a result of the NDR balance falling below $50exceeding $75 million. The CompanyAlabama Power expects to collect approximately $16$12 million annually untilunder Rate NDR unless the reserve balance is restored to $75 million. The NDR balance atfalls below $50 million. At December 31, 20172023 and 2022, the NDR balance was $38 million.$76 million and $97 million, respectively, and is included in other regulatory liabilities, deferred on the balance sheets.
As revenue from the Rate NDR charge is recognized, an equal amount of operations and maintenance expenses related to the NDR will also be recognized. As a result, the Rate NDR charge will not have an effect on net income but will impact operating cash flows.
EnvironmentalReliability Reserve Accounting Order
Based on an order fromIn July 2022, the Alabama PSC approved an accounting order authorizing Alabama Power to create a reliability reserve separate from the Company is allowedNDR and transition the previous Rate NDR authority related to establish a regulatory asset to record the unrecovered investment costs, including the unrecovered plant asset balance and the unrecovered costs associated with site removal and closure associated with future unit retirements caused by environmental regulations. The regulatory asset will be amortized and recovered over the affected unit's remaining useful life, as established priorreliability expenditures to the decision regarding early retirement through Rate CNP Compliance. See "Environmental Matters – Environmental Lawsreliability reserve. Alabama Power may make accruals to the reliability reserve if the NDR balance exceeds $35 million. At December 31, 2023 and Regulations" herein for additional information regarding environmental regulations.
Income Tax Matters
Federal Tax Reform Legislation2022, Alabama Power accrued $52 million and $166 million, respectively, to the reserve.
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation, among other things, reduces the federal corporate income tax rate to 21%, retains normalization provisions for public utility property and existing renewable energy incentives, and repeals the corporate alternative minimum tax.
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Regulated utility businesses can continue deducting all business interest expense and are not eligible for bonus depreciation on capital assets acquired and placed in service after September 27, 2017. Projects with binding contracts before September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the Protecting Americans from Tax Hikes (PATH) Act.
In addition, under the Tax Reform Legislation, net operating losses (NOL) generated after December 31, 2017 can no longer be carried back to previous tax years but can be carried forward indefinitely, with utilization limited to 80% of taxable income in the subsequent tax year. The projected reduction of Southern Company's consolidated income tax liability resulting from the tax rate reduction also delays the expected utilization of existing tax credit carryforwards.
For the year ended December 31, 2017, implementation of the Tax Reform Legislation resulted in an estimated net tax expense of $3 million, a $271 million decrease in regulatory assets, and a $2.0 billion increase in regulatory liabilities, primarily due to the impact of the reduction of the corporate income tax rate on deferred tax assets and liabilities.
The Tax Reform Legislation is subject to further interpretation and guidance from the IRS, as well as each respective state's adoption. In addition, the regulatory treatment of certain impacts of the Tax Reform Legislation is subject to the discretion of the FERC and the Alabama PSC. On January 31, 2018, SCS, on behalf of the traditional electric operating companies (including the Company), filed with the FERC a reduction to the Company's open access transmission tariff charge for 2018 to reflect the revised federal corporate tax rate. See Note 3 to the financial statements under "Regulatory Matters – Rate RSE" for additional information.
See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Note 5 to the financial statements under "Federal Tax Reform Legislation" for additional information.
The ultimate outcome of these matters cannot be determined at this time.
Bonus Depreciation
Under the Tax Reform Legislation, projects with binding contracts prior to September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the PATH Act. The PATH Act allowed for 50% bonus depreciation for 2015 through 2017, 40% bonus depreciation for 2018, and 30% bonus depreciation for 2019 and certain long-lived assets placed in service in 2020. Based on provisional estimates, approximately $200 million of positive cash flows is expected to result from bonus depreciation for the 2017 tax year and approximately $90 million for the 2018 tax year. Should Southern Company have a NOL in 2018, all of these cash flows may not be fully realized in 2018. See Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
Other Matters
The Company is involved in various other matters being litigated and regulatory matters that could affect future earnings. In addition, the Company is subject to certain claims and legal actions arising in the ordinary course of business. The Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters.
The ultimate outcome of such pending or potential litigation or regulatory matters cannot be predicted at this time; however, for current proceedings not specifically reported herein or in Note 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements. See Note 3 to the financial statements for a discussion of various other contingencies, regulatory matters, and other matters being litigated which may affect future earnings potential.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Company prepares its financial statements in accordance with GAAP. Significant accounting policies are described in Note 1 to the financial statements. In the application of these policies, certain estimates are made that may have a material impact on the Company's results of operations and related disclosures. Different assumptions and measurements could produce estimates that
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are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed the following critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Utility Regulation
The Company is subject to retail regulation byJuly 11, 2023, the Alabama PSC and wholesale regulation byissued an order authorizing Alabama Power to expand the FERC. As a result, the Company applies accounting standards which require the financial statementsexisting authority of its reliability reserve to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral ofinclude certain production-related expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards has a further effect on the Company's financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the Company; therefore, the accounting estimates inherent in specific costs such as depreciation, AROs, and pension and other postretirement benefits have less of a direct impact on the Company's results of operations and financial condition than they would on a non-regulated company.
As reflected in Note 1 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact the amounts of such regulatory assets and liabilities and could adversely impact the Company's financial statements.
Federal Tax Reform Legislation
Following the enactment of Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Notes 3 and 5 to the financial statements under "Retail Regulatory Matters – Rate RSE" and "Current and Deferred Income Taxes," respectively, for additional information.
Asset Retirement Obligations
AROs are computed as the fair value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities.
The liability for AROs primarily relates to the decommissioning of the Company's nuclear facility, Plant Farley, and facilities that are subjectintended to the CCR Rule, principally ash ponds. In addition, the Company has retirement obligations related to various landfill sites, underground storage tanks, asbestos removal related to ongoing repair andmaintain reliability in between scheduled generating unit maintenance disposal of polychlorinated biphenyls in certain transformers, and disposal of sulfur hexafluoride gas in certain substation breakers. The Company also has identified retirement obligations related to certain transmission and distribution facilities, asbestos containing material within long-term assets not subject to ongoing repair and maintenance activities, and certain wireless communication towers. However, liabilities for the removal of these assets have not been recorded because the settlement timing for the retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.outages.
The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure in place. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" and "Nuclear Decommissioning" for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
On August 18, 2023, Alabama Power Company 2017 Annual Report

Given the significant judgment involved in estimating AROs, the Company considers the liabilities for AROs to be critical accounting estimates.
Pension and Other Postretirement Benefits
The Company's calculation of pension and other postretirement benefits expense is dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term return on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the Company believes that the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect its pension and other postretirement benefits costs and obligations.
Key elements in determining the Company's pension and other postretirement benefit expense are the expected long-term return on plan assets and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. The expected long-term return on pension and other postretirement benefit plan assets is based on the Company's investment strategy, historical experience, and expectations for long-term rates of return that consider external actuarial advice. The Company determines the long-term return on plan assets by applying the long-term rate of expected returns on various asset classes to the Company's target asset allocation. For purposes of determining its liability related to the pension and other postretirement benefit plans, the Company discounts the future related cash flows using a single-point discount rate developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. For 2015 and prior years, the Company computed the interest cost component of its net periodic pension and other postretirement benefit plan expense using the same single-point discount rate. Beginning in 2016, the Company adopted a full yield curve approach for calculating the interest cost component whereby the discount rate for each year is applied to the liability for that specific year. As a result, the interest cost component of net periodic pension and other postretirement benefit plan expense decreased by approximately $24 million in 2016.
A 25 basis point change in any significant assumption (discount rate, salaries, or long-term return on plan assets) would result in an $9 million or less change in total annual benefit expense and a $128 million or less change in projected obligations.
The Company recorded pension costs of $9 million, $11 million, and $48 million in 2017, 2016, and 2015, respectively. Postretirement benefit costs for the Company were $3 million, $4 million, and $5 million in 2017, 2016, and 2015, respectively. Such amounts are dependent on several factors including trust earnings and changes to the plans. A portion of pension and other postretirement benefit costs is capitalized based on construction-related labor charges. Pension and other postretirement benefit costs are a component of the regulated rates and generally do not have a long-term effect on net income.
See Note 2 to the financial statements for additional information regarding pension and other postretirement benefits.
Contingent Obligations
The Company is subject to a number of federal and state laws and regulations, as well as other factors and conditions that subject it to environmental, litigation, and other risks. See FUTURE EARNINGS POTENTIAL herein and Note 3 to the financial statements for more information regarding certain of these contingencies. The Company periodically evaluates its exposure to such risks and records reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the Company's results of operations, cash flows, or financial condition.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed separately from revenues under ASC 606. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to cellular towers, railcars, and a PPA where the Company is the lessee and outdoor lighting and to land where the Company is the lessor. The Company is currently analyzing pole attachment agreements and a lease determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
FINANCIAL CONDITION AND LIQUIDITY
Overview
The Company's financial condition remained stable at December 31, 2017. The Company's cash requirements primarily consist of funding ongoing operations, common stock dividends, capital expenditures, and debt maturities. Capital expenditures and other
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

investing activities include investments to meet projected long-term demand requirements, to maintain existing generation facilities, to comply with environmental regulations including adding environmental modifications to certain existing generating units, to expand and improve transmission and distribution facilities, and for restoration following major storms. Operating cash flows provide a substantial portion of the Company's cash needs. For the three-year period from 2018 through 2020, the Company's projected common stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows. The Company plans to finance future cash needs in excess of its operating cash flows primarily through external securities issuances, borrowings from financial institutions, or equity contributions from Southern Company. The Company plans to use commercial paper to manage seasonal variations in operating cash flows and for other working capital needs. The Company intends to continue to monitor its access to short-term and long-term capital markets as well as its bank credit arrangements to meet future capital and liquidity needs. See "Sources of Capital," "Financing Activities," and "Capital Requirements and Contractual Obligations" herein for additional information.
The Company's investments in the qualified pension plan and the nuclear decommissioning trust funds increased in value as of December 31, 2017 as compared to December 31, 2016. No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated during 2018. The Company's funding obligations for the nuclear decommissioning trust fund are based on the most recent site study, and the next study is expected to be conducted in 2018. See Notes 1 and 2 to the financial statements under "Nuclear Decommissioning" and "Pension Plans," respectively, for additional information.
Net cash provided from operating activities totaled $1.8 billion for 2017, a decrease of $112 million as compared to 2016. The decrease in cash provided from operating activities was primarily due to the timing of income tax payments in 2017 and the receipt of income tax refunds in 2016 as a result of bonus depreciation, partially offset by the voluntary contribution to the qualified pension plan in 2016. Net cash provided from operating activities totaled $1.9 billion for 2016, a decrease of $193 million as compared to 2015. The decrease in cash provided from operating activities was primarily due to the collection of fuel cost recovery revenues and the voluntary contribution to the qualified pension plan, partially offset by the timing of income tax payments and refunds associated with bonus depreciation.
Net cash used for investing activities totaled $1.9 billion for 2017, $1.4 billion for 2016, and $1.5 billion for 2015. These activities were primarily related to gross property additions for environmental, steam generation, distribution, and transmission assets.
Net cash provided from financing activities totaled $163 million in 2017 primarily due to issuances of long-term debt and additional capital contributions from Southern Company, partially offset by the payment of common stock dividends and maturities of long-term debt. Net cash used for financing activities totaled $285 million in 2016 primarily due to the payment of common stock dividends and a redemption of long-term debt, partially offset by issuances of long-term debt and additional capital contributions from Southern Company. Fluctuations in cash flow from financing activities vary from year to year based on capital needs and the maturity or redemption of securities.
Significant balance sheet changes for 2017 included increases of $1.3 billion in property, plant, and equipment primarily due to additions to distribution and transmission facilities and environmental and steam generation assets and $1.1 billion in long-term debt. Other significant changes included an increase of $2.0 billion in deferred credits related to income taxes and decreases of $1.9 billion in accumulated deferred income taxes primarily due to the change in tax rate resulting from Tax Reform Legislation and $0.6 billion in securities due within one year. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Note 5 to the financial statements for additional information.
The Company's ratio of common equity to total capitalization plus short-term debt was 46.3% and 46.2% at December 31, 2017 and 2016, respectively. See Note 6 to the financial statements for additional information.
Sources of Capital
The Company plans to obtain the funds to meet its future capital needs from sources similar to those used in the past, which were primarily from operating cash flows, external security issuances, borrowings from financial institutions, and equity contributions from Southern Company. However, the amount, type, and timing of any future financings, if needed, will depend upon prevailing market conditions, regulatory approval, and other factors.
Security issuances are subject to regulatory approval by the Alabama PSC. Additionally, with respect to the public offering of securities, the Company files registration statements with the SEC under the Securities Act of 1933, as amended. The amounts of securities authorized bynotified the Alabama PSC are continuously monitored and appropriate filings are madeof its intent to ensure flexibilityuse a portion of its reliability reserve balance in 2023. During the capital markets.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
fourth quarter 2023, Alabama Power Company 2017 Annual Report

The Company obtains financing separately without credit support from any affiliate. See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information. The Southern Company system does not maintain a centralized cash or money pool. Therefore, fundsused $75 million of the Company are not commingled with funds of any other company in the Southern Company system.
The Company's current liabilities sometimes exceed current assets because of long-term debt maturitiesreliability reserve for reliability-related transmission, distribution, and the periodic use of short-term debt as a funding source, as well as significant seasonal fluctuations in cash needs.generation expenses and nuclear production-related expenses.
At December 31, 2017, the Company had approximately $544 million of cash2023 and cash equivalents. Committed credit arrangements with banks at December 31, 2017 were as follows:
Expires     Expires Within One Year
2018 2020 2022 Total Unused Term Out No Term Out
(in millions) (in millions) (in millions)
$35
 $500
 $800
 $1,335
 $1,335
 $
 $35
See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
In May 2017 and September 2017, the Company amended its $8002022, Alabama Power's reliability reserve balance was $143 million and $500$166 million, multi-year credit arrangements, which, among other things, extended the maturity dates from 2020 to 2022 and 2018 to 2020, respectively, as reflected in the table above.
Most of these bank credit arrangements, as well as the Company's term loan arrangements, contain covenants that limit debt levels and contain cross-acceleration provisions to other indebtedness (including guarantee obligations) of the Company. Such cross-acceleration provisions to other indebtedness would trigger an event of default if the Company defaulted on indebtedness, the payment of which was then accelerated. At December 31, 2017, the Company was in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowings.
Subject to applicable market conditions, the Company expects to renew or replace its bank credit arrangements as needed, prior to expiration. In connection therewith, the Company may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
A portion of the unused credit with banks is allocated to provide liquidity support to the Company's pollution control revenue bonds and commercial paper programs. The amount of variable rate pollution control revenue bonds outstanding requiring liquidity support was $854 million as of December 31, 2017. In addition, at December 31, 2017, the Company had $120 million of fixed rate pollution control revenue bonds outstanding that were required to be remarketed within the next 12 months.
The Company also has substantial cash flow from operating activities and access to the capital markets, including a commercial paper program, to meet liquidity needs. The Company may meet short-term cash needs through its commercial paper program. The Company may also meet short-term cash needs through a Southern Company subsidiary organized to issue and sell commercial paper at the request and for the benefit of the Company and the other traditional electric operating companies. Proceeds from such issuances for the benefit of the Company are loaned directly to the Company. The obligations of each traditional electric operating company under these arrangements are several and there is no cross-affiliate credit support.
Details of short-term borrowings were as follows:
 Short-term Debt at the End of the Period 
Short-term Debt During the Period (*)
 Amount Outstanding Weighted Average Interest Rate Average
Amount Outstanding
 Weighted
Average
Interest
Rate
 Maximum
Amount
Outstanding
 (in millions)   (in millions)   (in millions)
December 31, 2017$3
 3.7% $25
 1.3% $223
December 31, 2016$
 % $16
 0.6% $200
December 31, 2015$
 % $14
 0.2% $100
(*)Average and maximum amounts are based upon daily balances during the 12-month periods ended December 31, 2017, 2016, and 2015.
The Company believes that the need for working capital can be adequately met by utilizing commercial paper programs, lines of credit, and operating cash flows.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

Financing Activities
In February 2017, the Company repaid at maturity $200 million aggregate principal amount of Series 2007A 5.55% Senior Notes.
In March 2017, the Company issued $550 million aggregate principal amount of Series 2017A 2.45% Senior Notes due March 30, 2022. The proceeds were used to repay the Company's short-term indebtedness and for general corporate purposes, including the Company's continuous construction program.
In August 2017, the Company repaid at maturity $36.1 million aggregate principal amount of Series 1993-A, 1993-B, and 1993-C Industrial Development Board of the City of Mobile, Alabama Pollution Control Revenue Refunding Bonds (Alabama Power Company Project).
In September 2017, the Company issued 10 million shares ($250 million aggregate stated capital) of 5.00% Class A Preferred Stock, Cumulative, Par Value $1 Per Share (Stated Capital $25 Per Share). The proceeds were used in October 2017 to redeem all 2 million shares ($50 million aggregate stated capital) of 6.50% Series Preference Stock, 6 million shares ($150 million aggregate stated capital) of 6.45% Series Preference Stock, and 1.52 million shares ($38 million aggregate stated capital) of 5.83% Class A Preferred Stock and for other general corporate purposes, including the Company's continuous construction program.
In October 2017, the Company repaid at maturity $325 million aggregate principal amount of Series Q 5.50% Senior Notes.
In November 2017, the Company issued $550 million aggregate principal amount of Series 2017B 3.70% Senior Notes due December 1, 2047. The proceeds were used for general corporate purposes, including the Company's continuous construction program.
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Company plans to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Credit Rating Risk
At December 31, 2017, the Company did not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change to BBB and/or Baa2 or below. These contracts are primarily for physical electricity purchases, fuel purchases, fuel transportation and storage, energy price risk management, and transmission.
The maximum potential collateral requirements under these contracts at December 31, 2017 were as follows:
Credit Ratings
Maximum Potential
Collateral
Requirements
 (in millions)
At BBB and/or Baa2$1
At BBB- and/or Baa3$2
Below BBB- and/or Baa3$323
Included in these amounts are certain agreements that could require collateral in the event that either the Company or Georgia Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Company to access capital markets and would be likely to impact the cost at which it does so.
On March 24, 2017, S&P revised its consolidated credit rating outlook for Southern Company and its subsidiaries (including the Company) from stable to negative.
On January 19, 2018, Moody's revised its rating outlook for the Company from stable to negative.
While it is unclear how the credit rating agencies and regulatory authorities may respond to the Tax Reform Legislation, certain financial metrics, such as the funds from operations to debt percentage, used by the credit rating agencies to assess Southern Company and its subsidiaries, including the Company, may be negatively impacted. Absent actions by Southern Company and its subsidiaries, including the Company, to mitigate the resulting impacts, which, among other alternatives, could include adjusting capital structure and/or monetizing regulatory assets, the Company's credit ratings could be negatively affected. See Note 3 to the financial statements under "Retail Regulatory Matters – Rate RSE" for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

Market Price Risk
Due to cost-based rate regulation and other various cost recovery mechanisms, the Company continues to have limited exposure to market volatility in interest rates, commodity fuel prices, and prices of electricity. To manage the volatility attributable to these exposures, the Company nets the exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis.
To mitigate future exposure to changes in interest rates, the Company may enter into derivatives designated as hedges. The weighted average interest rate on $1.1 billion of long-term variable interest rate exposure at December 31, 2017 was 2.3%. If the Company sustained a 100 basis point change in interest rates for all long-term variable interest rate exposure, the change would affect annualized interest expense by approximately $11 million at December 31, 2017. See Note 1 to the financial statements under "Financial Instruments" and Note 11 to the financial statements for additional information.
To mitigate residual risks relative to movements in electricity prices, the Company enters into physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market and financial hedge contracts for natural gas purchases. The Company continues to manage a retail fuel-hedging program implemented per the guidelines of the Alabama PSC. The Company had no material change in market risk exposure for the year ended December 31, 2017 when compared to the year ended December 31, 2016.
In addition, Rate ECR allows the recovery of specific costs associated with the sales of natural gas that become necessary due to operating considerations at the Company's electric generating facilities. Rate ECR also allows recovery of the cost of financial instruments used for hedging market price risk up to 75% of the budgeted annual amount of natural gas purchases. The Company may not engage in natural gas hedging activities that extend beyond a rolling 42-month window. Also, the premiums paid for natural gas financial options may not exceed 5% of the Company's natural gas budget for that year.
The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. For the years ended December 31, the changes in fair value of energy-related derivative contracts, the majority of which are composed of regulatory hedges, were as follows:
 
2017
Changes
 
2016
Changes
 Fair Value
 (in millions)
Contracts outstanding at the beginning of the period, assets (liabilities), net$12
 $(54)
Contracts realized or settled(1) 39
Current period changes(*)
(17) 27
Contracts outstanding at the end of the period, assets (liabilities), net$(6) $12
(*)Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
The net hedge volumes of energy-related derivative contracts, for the years ended December 31 were as follows:
 2017 2016
 mmBtu Volume
 (in millions)
Commodity – Natural gas swaps64
 68
Commodity – Natural gas options5
 6
Total hedge volume69
 74
The weighted average swap contract cost above market prices was approximately $0.08 per mmBtu as of December 31, 2017 and below market prices was approximately $0.14 per mmBtu as of December 31, 2016. The change in option fair value is primarily attributable to the volatility of the market and the underlying change in the natural gas price. Substantially all of the natural gas hedge gains and losses are recovered through the Company's retail energy cost recovery clause.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

At December 31, 2017 and 2016, substantially all of the Company's energy-related derivative contracts were designated as regulatory hedges and were related to the Company's fuel-hedging program. Therefore, gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as they are recovered through the energy cost recovery clause. Certain other gains and losses on energy-related derivatives, designated as cash flow hedges, are initially deferred in OCI before being recognized in income in the same period as the hedged transaction. Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred and were not material for any year presented.
The Company uses over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. See Note 10 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts, which are primarily Level 2 of the fair value hierarchy, at December 31, 2017 were as follows:
   Fair Value Measurements
   December 31, 2017
 Total Maturity
 Fair Value  Year 1  Years 2&3
 (in millions)
Level 1$
 $
 $
Level 26
 4
 2
Level 3
 
 
Fair value of contracts outstanding at end of period$6
 $4
 $2
The Company is exposed to market price risk in the event of nonperformance by counterparties to energy-related and interest rate derivative contracts. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P, or with counterparties who have posted collateral to cover potential credit exposure. Therefore, the Company does not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 11 to the financial statements.
Capital Requirements and Contractual Obligations
The construction program of the Company is currently estimated to total $2.2 billion for 2018, $1.6 billion for 2019, $1.6 billion for 2020, $1.7 billion for 2021, and $1.4 billion for 2022. The construction program includes capital expenditures related to contractual purchase commitments for nuclear fuel and capital expenditures covered under long-term service agreements. Estimated capital expenditures to comply with environmental laws and regulations included in these amounts are $581 million for 2018, $110 million for 2019, $163 million for 2020, $258 million for 2021, and $268 million for 2022. These estimated expenditures do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" and "– Global Climate Issues" herein for additional information.
The Company also anticipates costs associated with closure in place and monitoring of ash ponds in accordance with the CCR Rule, which are reflected in the Company's ARO liabilities. These costs, which could change as the Company continues to refine its assumptions underlying the cost estimates and evaluate the method and timing of compliance activities, are estimated to be $0.3 million for 2018, $111 million for 2019, $90 million for 2020, $94 million for 2021, and $96 million for 2022. See Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information. Costs associated with the CCR Rule are expected to be recovered through Rate CNP Compliance.
The construction program is subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; changes in environmental laws and regulations; the outcome of any legal challenges to the environmental rules; changes in generating plants, including unit retirements and replacements and adding or changing fuel sources at existing generating units, to meet regulatory requirements; changes in the expected environmental compliance program; changes in FERC rules and regulations; Alabama PSC approvals; changes in legislation; the cost and efficiency of construction labor, equipment, and materials; project scope and design changes; storm impacts; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures will be fully recovered.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

As a result of NRC requirements, the Company has external trust funds for nuclear decommissioning costs; however, the Company currently has no additional funding requirements. For additional information, see Note 1 to the financial statements under "Nuclear Decommissioning."
In addition, as discussed in Note 2 to the financial statements, the Company provides postretirement benefits to substantially all employees and funds trusts to the extent required by the Alabama PSC and the FERC.
Other funding requirements related to obligations associated with scheduled maturities of long-term debt, as well as the related interest, derivative obligations, pension and other postretirement benefit plans, preferred stock dividends, leases, and other purchase commitments are detailed in the contractual obligations table that follows. See Notes 1, 2, 6, 7, and 11 to the financial statements for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

Contractual Obligations
Contractual obligations at December 31, 2017 were as follows:
 2018 2019- 2020 2021- 2022 After 2022 Total
 (in millions)
Long-term debt(a) —
         
Principal$
 $450
 $1,060
 $6,176
 $7,686
Interest304
 598
 561
 4,408
 5,871
Preferred stock dividends(b)
15
 29
 29
 
 73
Financial derivative obligations(c)
6
 4
 
 
 10
Operating leases(d)
21
 40
 24
 20
 105
Capital Lease1
 1
 1
 2
 5
Purchase commitments —         
Capital(e)
2,053
 2,972
 2,914
 
 7,939
Fuel(f)
974
 1,197
 459
 238
 2,868
Purchased power(g)
78
 171
 186
 606
 1,041
Other(h)
47
 73
 59
 313
 492
Pension and other postretirement benefit plans(i)
19
 36
 
 
 55
Total$3,518
 $5,571
 $5,293
 $11,763
 $26,145
(a)All amounts are reflected based on final maturity dates. The Company plans to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit. Variable rate interest obligations are estimated based on rates as of December 31, 2017, as reflected in the statements of capitalization. Fixed rates include, where applicable, the effects of interest rate derivatives employed to manage interest rate risk. Long-term debt excludes capital lease amounts (shown separately).
(b)Preferred stock does not mature; therefore, amounts are provided for the next five years only.
(c)Includes derivative liabilities related to cash flow hedges of forecasted debt, as well as energy-related derivatives. For additional information, see Notes 1 and 11 to the financial statements.
(d)Excludes PPAs that are accounted for as leases and are included in purchased power.
(e)The Company provides estimated capital expenditures for a five-year period, including capital expenditures associated with environmental regulations. These amounts exclude contractual purchase commitments for nuclear fuel and capital expenditures covered under long-term service agreements which are reflected in "Fuel" and "Other," respectively. At December 31, 2017, purchase commitments were outstanding in connection with the construction program. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" herein for additional information.
(f)Includes commitments to purchase coal, nuclear fuel, and natural gas, as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery. Amounts reflected for natural gas purchase commitments have been estimated based on the New York Mercantile Exchange future prices at December 31, 2017.
(g)Estimated minimum long-term obligations for various long-term commitments for the purchase of capacity and energy.
(h)Includes long-term service agreements and contracts for the procurement of limestone. Long-term service agreements include price escalation based on inflation indices.
(i)The Company forecasts contributions to the pension and other postretirement benefit plans over a three-year period. The Company anticipates no mandatory contributions to the qualified pension plan during the next three years. Amounts presented represent estimated benefit payments for the nonqualified pension plans, estimated non-trust benefit payments for the other postretirement benefit plans, and estimated contributions to the other postretirement benefit plan trusts, all of which will be made from the Company's corporate assets. See Note 2 to the financial statements for additional information related to the pension and other postretirement benefit plans, including estimated benefit payments. Certain benefit payments will be made through the related benefit plans. Other benefit payments will be made from the Company's corporate assets.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

Cautionary Statement Regarding Forward-Looking Statements
The Company's 2017 Annual Report contains forward-looking statements. Forward-looking statements include, among other things, statements concerning regulated rates, customer and sales growth, economic conditions, fuel and environmental cost recovery and other rate actions, current and proposed environmental regulations and related compliance plans and estimated expenditures, pending or potential litigation matters, access to sources of capital, projections for the qualified pension plan, postretirement benefit plans, and nuclear decommissioning trust fund contributions, financing activities, filings with state and federal regulatory authorities, impacts of the Tax Reform Legislation, federal income tax benefits, estimated sales and purchases under power sale and purchase agreements, and estimated construction and other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:
the impact of recent and future federal and state regulatory changes, including environmental laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which the Company is subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulations and IRS interpretations, actions that may be taken in response by regulatory authorities, and its impact, if any, on the credit ratings of the Company;
current and future litigation or regulatory investigations, proceedings, or inquiries;
the effects, extent, and timing of the entry of additional competition in the markets in which the Company operates;
variations in demand for electricity, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures, including from the development and deployment of alternative energy sources such as self-generation and distributed generation technologies, and any potential economic impacts resulting from federal fiscal decisions;
available sources and costs of fuels;
effects of inflation;
the ability to control costs and avoid cost overruns during the development and construction of facilities, to construct facilities in accordance with the requirements of permits and licenses, and to satisfy any environmental performance standards;
investment performance of the Company's employee and retiree benefit plans and nuclear decommissioning trust funds;
advances in technology;
state and federal rate regulations and the impact of pending and future rate cases and negotiations, including rate actions relating to fuel and other cost recovery mechanisms;
the inherent risks involved in operating nuclear generating facilities, including environmental, health, regulatory, natural disaster, terrorism, and financial risks;
the ability to successfully operate generating, transmission, and distribution facilities and the successful performance of necessary corporate functions;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, which cannot be assured to be completed or beneficial to the Company;
the ability of counterparties of the Company to make payments as and when due and to perform as required;
the ability to obtain new short- and long-term contracts with wholesale customers;
the direct or indirect effect on the Company's business resulting from cyber intrusion or physical attack and the threat of physical attacks;
interest rate fluctuations and financial market conditions and the results of financing efforts;
changes in the Company's credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general;
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Alabama Power Company 2017 Annual Report

the ability of the Company to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;
catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events such as influenzas, or other similar occurrences;
the direct or indirect effects on the Company's business resulting from incidents affecting the U.S. electric grid or operation of generating resources;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by the Company from time to time with the SEC.
The Company expressly disclaims any obligation to update any forward-looking statements.
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STATEMENTS OF INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Alabama Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Revenues:     
Retail revenues$5,458
 $5,322
 $5,234
Wholesale revenues, non-affiliates276
 283
 241
Wholesale revenues, affiliates97
 69
 84
Other revenues208
 215
 209
Total operating revenues6,039
 5,889
 5,768
Operating Expenses:     
Fuel1,225
 1,297
 1,342
Purchased power, non-affiliates170
 166
 171
Purchased power, affiliates158
 168
 180
Other operations and maintenance1,652
 1,510
 1,501
Depreciation and amortization736
 703
 643
Taxes other than income taxes384
 380
 368
Total operating expenses4,325
 4,224
 4,205
Operating Income1,714
 1,665
 1,563
Other Income and (Expense):     
Allowance for equity funds used during construction39
 28
 60
Interest expense, net of amounts capitalized(305) (302) (274)
Other income (expense), net(14) (21) (32)
Total other income and (expense)(280) (295) (246)
Earnings Before Income Taxes1,434
 1,370
 1,317
Income taxes568
 531
 506
Net Income866
 839
 811
Dividends on Preferred and Preference Stock18
 17
 26
Net Income After Dividends on Preferred and Preference Stock$848
 $822
 $785
The accompanying notes are an integral part of these financial statements.

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STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Alabama Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Net Income$866
 $839
 $811
Other comprehensive income (loss):     
Qualifying hedges:     
Changes in fair value, net of tax of $(1), $(1), and $(3), respectively1
 (2) (5)
Reclassification adjustment for amounts included in net income,
net of tax of $2, $2, and $1, respectively
3
 4
 2
Total other comprehensive income (loss)4
 2
 (3)
Comprehensive Income$870
 $841
 $808
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2017, 2016, and 2015
Alabama Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Activities:     
Net income$866
 $839
 $811
Adjustments to reconcile net income
to net cash provided from operating activities —
     
Depreciation and amortization, total888
 844
 780
Deferred income taxes409
 407
 388
Allowance for equity funds used during construction(39) (28) (60)
Pension and postretirement funding(2) (133) 
Other, net(14) (102) 15
Changes in certain current assets and liabilities —     
-Receivables(168) 94
 (160)
-Other current assets(16) 1
 40
-Accounts payable71
 73
 3
-Accrued taxes(84) 93
 138
-Retail fuel cost over recovery(76) (162) 191
-Other current liabilities2
 23
 (4)
Net cash provided from operating activities1,837
 1,949
 2,142
Investing Activities:     
Property additions(1,882) (1,272) (1,367)
Nuclear decommissioning trust fund purchases(237) (352) (439)
Nuclear decommissioning trust fund sales237
 351
 438
Cost of removal net of salvage(112) (94) (71)
Change in construction payables161
 (37) (15)
Other investing activities(43) (34) (34)
Net cash used for investing activities(1,876) (1,438) (1,488)
Financing Activities:     
Increase in notes payable, net3
 
 
Proceeds —     
Senior notes1,100
 400
 975
Preferred stock250
 
 
Pollution control revenue bonds
 
 80
Other long-term debt
 45
 
Capital contributions from parent company361
 260
 22
Redemptions and repurchases —     
Senior notes(525) (200) (650)
Preferred and preference stock(238) 
 (412)
Pollution control revenue bonds(36) 
 (134)
Payment of common stock dividends(714) (765) (571)
Other financing activities(38) (25) (43)
Net cash provided from (used for) financing activities163
 (285) (733)
Net Change in Cash and Cash Equivalents124
 226
 (79)
Cash and Cash Equivalents at Beginning of Year420
 194
 273
Cash and Cash Equivalents at End of Year$544
 $420
 $194
Supplemental Cash Flow Information:     
Cash paid (received) during the period for —     
Interest (net of $15, $11, and $22 capitalized, respectively)$285
 $277
 $250
Income taxes (net of refunds)236
 (108) 121
Noncash transactions — Accrued property additions at year-end245
 84
 121
The accompanying notes are an integral part of these financial statements.
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BALANCE SHEETS
At December 31, 2017 and 2016
Alabama Power Company 2017 Annual Report
Assets2017
 2016
 (in millions)
Current Assets:   
Cash and cash equivalents$544
 $420
Receivables —   
Customer accounts receivable355
 348
Unbilled revenues162
 146
Affiliated43
 40
Other accounts and notes receivable55
 27
Accumulated provision for uncollectible accounts(9) (10)
Fossil fuel stock184
 205
Materials and supplies458
 435
Other regulatory assets, current124
 149
Other current assets90
 45
Total current assets2,006
 1,805
Property, Plant, and Equipment:   
In service27,326
 26,031
Less: Accumulated provision for depreciation9,563
 9,112
Plant in service, net of depreciation17,763
 16,919
Nuclear fuel, at amortized cost339
 336
Construction work in progress908
 491
Total property, plant, and equipment19,010
 17,746
Other Property and Investments:   
Equity investments in unconsolidated subsidiaries67
 66
Nuclear decommissioning trusts, at fair value903
 792
Miscellaneous property and investments124
 112
Total other property and investments1,094
 970
Deferred Charges and Other Assets:   
Deferred charges related to income taxes239
 525
Deferred under recovered regulatory clause revenues54
 150
Other regulatory assets, deferred1,272
 1,157
Other deferred charges and assets189
 163
Total deferred charges and other assets1,754
 1,995
Total Assets$23,864
 $22,516
The accompanying notes are an integral part of these financial statements.

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BALANCE SHEETS
At December 31, 2017 and 2016
Alabama Power Company 2017 Annual Report
Liabilities and Stockholder's Equity2017
 2016
 (in millions)
Current Liabilities:   
Securities due within one year$
 $561
Accounts payable —   
Affiliated327
 297
Other585
 433
Customer deposits92
 88
Accrued taxes —   
Accrued income taxes9
 45
Other accrued taxes45
 42
Accrued interest77
 78
Accrued compensation205
 193
Other regulatory liabilities, current1
 85
Other current liabilities59
 76
Total current liabilities1,400
 1,898
Long-Term Debt (See accompanying statements)
7,628
 6,535
Deferred Credits and Other Liabilities:   
Accumulated deferred income taxes2,760
 4,654
Deferred credits related to income taxes2,082
 65
Accumulated deferred ITCs112
 110
Employee benefit obligations304
 300
Asset retirement obligations1,702
 1,503
Other cost of removal obligations609
 684
Other regulatory liabilities, deferred84
 100
Other deferred credits and liabilities63
 63
Total deferred credits and other liabilities7,716
 7,479
Total Liabilities16,744
 15,912
Redeemable Preferred Stock (See accompanying statements)
291
 85
Preference Stock (See accompanying statements)

 196
Common Stockholder's Equity (See accompanying statements)
6,829
 6,323
Total Liabilities and Stockholder's Equity$23,864
 $22,516
Commitments and Contingent Matters (See notes)

 
The accompanying notes are an integral part of these financial statements.

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STATEMENTS OF CAPITALIZATION
At December 31, 2017 and 2016
Alabama Power Company 2017 Annual Report
 2017
 2016
 2017
 2016
 (in millions) (percent of total)
Long-Term Debt:       
Long-term debt payable to affiliated trusts —       
Variable rate (4.44% at 12/31/17) due 2042$206
 $206
    
Long-term notes payable —       
5.50% to 5.55% due 2017
 525
    
5.125% due 2019200
 200
    
3.375% due 2020250
 250
    
2.38% to 3.95% due 2021220
 220
    
2.45% to 5.875% due 2022750
 200
    
2.80% to 6.125% due 2023-20474,975
 4,425
    
Variable rates (2.55% to 2.786% at 12/31/17) due 202125
 25
    
Total long-term notes payable6,420
 5,845
    
Other long-term debt —       
Pollution control revenue bonds —       
1.625% to 1.85% due 2034207
 207
    
Variable rates (0.77% to 0.79% at 1/1/17) due 2017
 36
    
Variable rates (1.86% to 1.87% at 12/31/17) due 202165
 65
    
Variable rates (1.70% to 1.87% at 12/31/17) due 2024-2038788
 788
    
Total other long-term debt1,060
 1,096
    
Capitalized lease obligations4
 4
    
Unamortized debt premium (discount), net(11) (9)    
Unamortized debt issuance expense(51) (46)    
Total long-term debt (annual interest requirement — $305 million)7,628
 7,096
    
Less amount due within one year
 561
    
Long-term debt excluding amount due within one year7,628
 6,535
 51.7% 49.7%
Redeemable Preferred Stock:       
Cumulative redeemable preferred stock       
$100 par or stated value — 4.20% to 4.92%       
Authorized — 3,850,000 shares       
Outstanding — 475,115 shares48
 48
    
$1 par value —       
Authorized — 27,500,000 shares       
Outstanding — 2017: 5.00% — 10,000,000 shares: $25 stated value       
  — 2016: 5.83% — 1,520,000 shares: $25 stated value       
(annual dividend requirement — $15 million)243
 37
    
Total redeemable preferred stock291
 85
 2.0
 0.7
Preference Stock:       
$1 par value — 6.45% to 6.50%       
Authorized — 40,000,000 shares       
Outstanding — 2017: no shares       
 — 2016: 8,000,000 shares (non-cumulative): $25 stated value
 196
  1.5
Common Stockholder's Equity:       
Common stock, par value $40 per share —       
Authorized — 40,000,000 shares       
Outstanding — 30,537,500 shares1,222
 1,222
    
Paid-in capital2,986
 2,613
    
Retained earnings2,647
 2,518
    
Accumulated other comprehensive loss(26) (30)    
Total common stockholder's equity6,829
 6,323
 46.3
 48.1
Total Capitalization$14,748
 $13,139
 100.0% 100.0%
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2017, 2016, and 2015
Alabama Power Company 2017 Annual Report
 
Number of
Common
Shares
Issued
 
Common
Stock
 
Paid-In
Capital
 
Retained
Earnings
 
Accumulated
Other
Comprehensive
Income (Loss)
 Total
 (in millions)
Balance at December 31, 201431
 $1,222
 $2,304
 $2,255
 $(29) $5,752
Net income after dividends on preferred
and preference stock

 
 
 785
 
 785
Capital contributions from parent company
 
 37
 
 
 37
Other comprehensive income (loss)
 
 
 
 (3) (3)
Cash dividends on common stock
 
 
 (571) 
 (571)
Other
 
 
 (8) 
 (8)
Balance at December 31, 201531
 1,222
 2,341
 2,461
 (32) 5,992
Net income after dividends on preferred
and preference stock

 
 
 822
 
 822
Capital contributions from parent company
 
 272
 
 
 272
Other comprehensive income (loss)
 
 
 
 2
 2
Cash dividends on common stock
 
 
 (765) 
 (765)
Balance at December 31, 201631
 1,222
 2,613
 2,518
 (30) 6,323
Net income after dividends on preferred
and preference stock

 
 
 848
 
 848
Capital contributions from parent company
 
 373
 
 
 373
Other comprehensive income (loss)
 
 
 
 4
 4
Cash dividends on common stock
 
 
 (714) 
 (714)
Other
 
 
 (5) 
 (5)
Balance at December 31, 201731
 $1,222
 $2,986
 $2,647
 $(26) $6,829
The accompanying notes are an integral part of these financial statements.

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NOTES TO FINANCIAL STATEMENTS
Alabama Power Company 2017 Annual Report




Index to the Notes to Financial Statements

NotePage
1
2
3
4
5
6
7
8
9
10
11
12

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NOTES (continued)
Alabama Power Company 2017 Annual Report

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
Alabama Power Company (the Company) is a wholly-owned subsidiary of Southern Company, which is the parent company of the Company and three other traditional electric operating companies, Southern Power, Southern Company Gas (as of July 1, 2016), SCS, Southern Linc, Southern Company Holdings, Inc. (Southern Holdings), Southern Nuclear, PowerSecure, Inc. (PowerSecure) (as of May 9, 2016), and other direct and indirect subsidiaries. The traditional electric operating companies – the Company, Georgia Power, Gulf Power, and Mississippi Power – are vertically integrated utilities providing electric service in four Southeastern states. The Company provides electric service to retail and wholesale customers within its traditional service territory located in the State of Alabama in addition to wholesale customers in the Southeast. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through utilities in seven states and is involved in several other complementary businesses including gas marketing services, wholesale gas services, and gas midstream operations. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary, primarily for Southern Company's investments in leveraged leases and for other electric services. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants, including the Company's Plant Farley. PowerSecure is a provider of products and services in the areas of distributed generation, energy efficiency, and utility infrastructure.
The equity method is used for subsidiaries in which the Company has significant influence but does not control and for variable interest entities (VIEs) where the Company has an equity investment, but is not the primary beneficiary.
The Company is subject to regulation by the FERC and the Alabama PSC. As such, the Company's financial statements reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by its regulatory commissions. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed separately from revenues under ASC 606. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
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NOTES (continued)
Alabama Power Company 2017 Annual Report

Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to cellular towers, railcars, and a PPA where the Company is the lessee and outdoor lighting and to land where the Company is the lessor. The Company is currently analyzing pole attachment agreements and a lease determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). ASU 2016-09 changes the accounting for income taxes and the cash flow presentation for share-based payment award transactions effective for fiscal years beginning after December 15, 2016. The new guidance requires all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation to be recognized as income tax expense or benefit in the income statement. Previously, the Company recognized any excess tax benefits and deficiencies related to the exercise and vesting of stock compensation as additional paid-in capital. In addition, the new guidance requires excess tax benefits for share-based payments to be included in net cash provided from operating activities rather than net cash provided from financing activities on the statement of cash flows. The Company elected to adopt the guidance in 2016 and reflect the related adjustments as of January 1, 2016. Prior year's data presented in the financial statements has not been adjusted. The Company also elected to recognize forfeitures as they occur. The new guidance did not have a material impact on the results of operations, financial position, or cash flows of the Company. See Notes 5 and 8 for disclosures impacted by ASU 2016-09.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
Affiliate Transactions
The Company has an agreement with SCS under which the following services are rendered to the Company at direct or allocated cost: general and design engineering, operations, purchasing, accounting, finance and treasury, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, and other services with respect to business and operations, construction management, and power pool transactions. Costs for these services amounted to $479 million, $460 million, and $438 million during 2017, 2016, and 2015, respectively. Cost allocation methodologies used by SCS prior to the repeal of the Public Utility Holding Company Act of 1935,
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Alabama Power Company 2017 Annual Report

as amended, were approved by the SEC. Subsequently, additional cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies. See Note 7 under "Operating Leases" for information on leases of cellular tower space for the Company's digital wireless communications equipment.
The Company has an agreement with Southern Nuclear under which the following nuclear-related services are rendered to the Company at cost: general executive and advisory services, general operations, management and technical services, administrative services including procurement, accounting, employee relations, systems and procedures services, strategic planning and budgeting services, and other services with respect to business and operations. Costs for these services amounted to $248 million, $249 million, and $243 million during 2017, 2016, and 2015, respectively.
The Company jointly owns Plant Greene County with Mississippi Power. The Company has an agreement with Mississippi Power under which the Company operates Plant Greene County, and Mississippi Power reimburses the Company for its proportionate share of non-fuel expenses, which totaled $9 million in 2017, $13 million in 2016, and $11 million in 2015. Mississippi Power also reimbursed the Company for any direct fuel purchases delivered from one of the Company's transfer facilities. There were no such fuel purchases in 2017 and 2016 and $8 million in 2015. See Note 4 for additional information.
The Company has an agreement with Gulf Power under which the Company made transmission system upgrades to ensure firm delivery of energy under a non-affiliate PPA from a combined cycle plant located in Autauga County, Alabama. Under a related tariff, the Company received $11 million in 2017, $12 million in 2016, and $14 million in 2015 and expects to recover a total of approximately $61 million from 2018 through 2023 from Gulf Power.
In September 2016, Southern Company Gas acquired a 50% equity interest in Southern Natural Gas Company, L.L.C. (SNG). Prior to completion of the acquisition, SCS, as agent for the Company, had entered into a long-term interstate natural gas transportation agreement with SNG. The interstate transportation service provided to the Company by SNG pursuant to this agreement is governed by the terms and conditions of SNG's natural gas tariff and is subject to FERC regulation. Transportation costs under this agreement were approximately $9 million in 2017 and $2 million for the period subsequent to Southern Company Gas' investment in SNG through December 31, 2016.
The Company has agreements with PowerSecure for services related to utility infrastructure construction, distributed energy, and energy efficiency projects. Costs for these services amounted to approximately $11 million for 2017 and were immaterial for 2016.
The Company provides incidental services to and receives such services from other Southern Company subsidiaries which are generally minor in duration and amount. Except as described herein, the Company neither provided nor received any material services to or from affiliates in 2017, 2016, or 2015.
Also, see Note 4 for information regarding the Company's ownership in a PPA and a gas pipeline ownership agreement with SEGCO.
The traditional electric operating companies, including the Company and Southern Power, may jointly enter into various types of wholesale energy, natural gas, and certain other contracts, either directly or through SCS as agent. Each participating company may be jointly and severally liable for the obligations incurred under these agreements. See Note 7 under "Fuel and Purchased Power Agreements" for additional information.
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Alabama Power Company 2017 Annual Report

Regulatory Assets and Liabilities
The Company is subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process.
Regulatory assets and (liabilities) reflected in the balance sheets at December 31 relate to:
 2017 2016 Note
 (in millions)  
Retiree benefit plans$946
 $947
 (i,j)
Deferred income tax charges240
 526
 (a,k,n)
Regulatory clauses142
 
 (m)
Vacation pay70
 69
 (c,j)
Loss on reacquired debt62
 68
 (b)
Nuclear outage56
 70
 (d)
Remaining net book value of retired assets54
 69
 (l)
Under/(over) recovered regulatory clause revenues53
 76
 (d)
Other regulatory assets51
 50
 (f)
Fuel-hedging losses7
 1
 (e,j)
Deferred income tax credits(2,082) (65) (a,n)
Other cost of removal obligations(609) (684) (a)
Natural disaster reserve(38) (69) (h)
Asset retirement obligations(33) 12
 (a)
Other regulatory liabilities(7) (23) (e,g)
Total regulatory assets (liabilities), net$(1,088) $1,047
  
Note: The recovery and amortization periods for these regulatory assets and (liabilities) are as follows:
(a)Asset retirement and removal assets and liabilities are recorded, deferred income tax assets are recovered, and deferred income tax credits are amortized over the related property lives, which may range up to 50 years. Asset retirement and other cost of removal assets and liabilities will be settled and trued up following completion of the related activities.
(b)Recovered over the remaining life of the original issue, which may range up to 50 years.
(c)Recorded as earned by employees and recovered as paid, generally within one year. This includes both vacation and banked holiday pay.
(d)Recorded and recovered or amortized as approved or accepted by the Alabama PSC over periods not exceeding 10 years. See Note 3 under "Retail Regulatory Matters" for additional information.
(e)Fuel-hedging assets and liabilities are recorded over the life of the underlying hedged purchase contracts, which generally do not exceed three and a half years. Upon final settlement, actual costs incurred are recovered through the energy cost recovery clause.
(f)Comprised of components including generation site selection/evaluation costs, PPA capacity (to be recovered over the next 12 months), and other miscellaneous assets. Recorded as accepted by the Alabama PSC. Capitalized upon initialization of related construction projects, if applicable.
(g)Comprised of components including mine reclamation and remediation liabilities and fuel-hedging gains. Recorded as accepted by the Alabama PSC. Mine reclamation and remediation liabilities will be settled following completion of the related activities.
(h)Utilized as storm restoration and potential reliability-related expenses are incurred, as approved by the Alabama PSC.
(i)Recovered and amortized over the average remaining service period which may range up to 15 years. See Note 2 for additional information.
(j)Not earning a return as offset in rate base by a corresponding asset or liability.
(k)Included in the deferred income tax charges are $13 million for 2017 and $16 million for 2016 for the retiree Medicare drug subsidy, which is recovered and amortized, as approved by the Alabama PSC, over the average remaining service period which may range up to 15 years.
(l)Recorded and amortized as approved by the Alabama PSC for a period up to 11 years.
(m)Established per an order from the Alabama PSC issued on February 17, 2017 and will be amortized concurrently with the effective date of the Company's next depreciation study. See Note 3 under "Retail Regulatory Matters – Rate RSE" for additional information.
(n)As a result of the Tax Reform Legislation, these accounts include certain deferred income tax assets and liabilities not subject to normalization. The recovery and amortization of these amounts will be established consistent with guidance provided by the Alabama PSC. See Note 5 for additional information.
In the event that a portion of the Company's operations is no longer subject to applicable accounting rules for rate regulation, the Company would be required to write off to income or reclassify to accumulated OCI related regulatory assets and liabilities that
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Alabama Power Company 2017 Annual Report

are not specifically recoverable through regulated rates. In addition, the Company would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 3 under "Retail Regulatory Matters" for additional information.
Revenues
Wholesale capacity revenues from PPAs are recognized either on a levelized basis over the appropriate contract period or the amount billable under the contract terms. Energy and other revenues are recognized as services are provided. Unbilled revenues related to retail sales are accrued at the end of each fiscal period. Electric rates for the Company include provisions to adjust billings for fluctuations in fuel costs, fuel hedging, the energy component of purchased power costs, and certain other costs. Revenues are adjusted for differences between these actual costs and amounts billed in current regulated rates. Under or over recovered regulatory clause revenues are recorded in the balance sheets and are recovered or returned to customers through adjustments to the billing factors. The Company and the Alabama PSC continuously monitor the under/over recovered balances. The Company files for revised rates as required or when management deems appropriate, depending on the rate. See Note 3 under "Retail Regulatory Matters – Rate ECR" and "Retail Regulatory Matters – Rate CNP Compliance" for additional information.
The Company has a diversified base of customers. No single customer or industry comprises 10% or more of revenues. For all periods presented, uncollectible accounts averaged less than 1% of revenues.
Fuel Costs
Fuel costs are expensed as the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. Fuel expense also includes the amortization of the cost of nuclear fuel.
Income and Other Taxes
The Company uses the liability method of accounting for deferred income taxes and provides deferred income taxes for all significant income tax temporary differences. Federal ITCs utilized are deferred and amortized to income over the average life of the related property. Taxes that are collected from customers on behalf of governmental agencies to be remitted to these agencies are presented net on the statements of income.
The Company recognizes tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 5 under "Unrecognized Tax Benefits" for additional information.
Property, Plant, and Equipment
Property, plant, and equipment is stated at original cost less any regulatory disallowances and impairments. Original cost includes: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and cost of equity funds used during construction.
The Company's property, plant, and equipment in service consisted of the following at December 31:
 2017 2016
 (in millions)
Generation$14,213
 $13,551
Transmission4,119
 3,921
Distribution7,034
 6,707
General1,948
 1,840
Plant acquisition adjustment12
 12
Total plant in service$27,326
 $26,031
The cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed with the exception of nuclear refueling costs, which are recorded in accordance with specific Alabama PSC orders.
Nuclear Outage Accounting Order
In accordance with an Alabama PSC order, nuclear outage operations and maintenance expenses for the two units at Plant Farley are deferred to a regulatory asset when the charges actually occur and are then amortized over a subsequent 18-month period with
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the fall outage costs amortization beginning in January of the following year and the spring outage costs amortization beginning in July of the same year.
Depreciation and Amortization
Depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates, which approximated 2.9% in 2017, 3% in 2016, and 2.9% in 2015. Depreciation studies are conducted periodically to update the composite rates and the information is provided to the Alabama PSC and approved by the FERC. When property subject to composite depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the plant are retired when the related property unit is retired.
In 2016, the Company submitted an updated depreciation study to the FERC and received authorization to use the recommended rates beginning January 2017. The study was also provided to the Alabama PSC.
Asset Retirement Obligations and Other Costs of Removal
AROs are computed as the present value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. The Company has received accounting guidance from the Alabama PSC allowing the continued accrual of other future retirement costs for long-lived assets that the Company does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as a regulatory liability.
The liability for AROs primarily relates to the decommissioning of the Company's nuclear facility, Plant Farley, and facilities that are subject to the Disposal of Coal Combustion Residuals from Electric Utilities final rule published by the EPA in 2015 (CCR Rule), principally ash ponds. In addition, the Company has retirement obligations related to various landfill sites, underground storage tanks, asbestos removal related to ongoing repair and maintenance, disposal of polychlorinated biphenyls in certain transformers, and disposal of sulfur hexafluoride gas in certain substation breakers. The Company also has identified retirement obligations related to certain transmission and distribution facilities, asbestos containing material within long-term assets not subject to ongoing repair and maintenance activities, and certain wireless communication towers. However, liabilities for the removal of these assets have not been recorded because the settlement timing for the retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO. The Company will continue to recognize in the statements of income allowed removal costs in accordance with its regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability, as ordered by the Alabama PSC, and are reflected in the balance sheets. See "Nuclear Decommissioning" herein for additional information on amounts included in rates.
Details of the AROs included in the balance sheets are as follows:
 2017  2016 
 (in millions) 
Balance at beginning of year$1,533
  $1,448
 
Liabilities incurred
  5
 
Liabilities settled(26)  (25) 
Accretion77
  73
 
Cash flow revisions125
  32
 
Balance at end of year$1,709
  $1,533
 
The increase in liabilities incurred and cash flow revisions in 2017 is primarily due to updated cost estimates related to the closure of ash ponds and landfills. The increase in 2016 is primarily related to changes in ash pond closure strategy.
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The cost estimates for AROs related to the CCR Rule are based on information as of December 31, 2017 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure in place. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary.
Nuclear Decommissioning
The NRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. The Company has external trust funds (Funds) to comply with the NRC's regulations. Use of the Funds is restricted to nuclear decommissioning activities. The Funds are managed and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and the Alabama PSC, as well as the IRS. While the Company is allowed to prescribe an overall investment policy to the Funds' managers, the Company and its affiliates are not allowed to engage in the day-to-day management of the Funds or to mandate individual investment decisions. Day-to-day management of the investments in the Funds is delegated to unrelated third party managers with oversight by the management of the Company. The Funds' managers are authorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the return on the Funds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities.
The Company records the investment securities held in the Funds at fair value, as disclosed in Note 10, as management believes that fair value best represents the nature of the Funds. Gains and losses, whether realized or unrealized, are recorded in the regulatory liability for AROs in the balance sheets and are not included in net income or OCI. Fair value adjustments and realized gains and losses are determined on a specific identification basis.
At December 31, 2017, investment securities in the Funds totaled $902 million, consisting of equity securities of $644 million, debt securities of $223 million, and $35 million of other securities. At December 31, 2016, investment securities in the Funds totaled $790 million, consisting of equity securities of $552 million, debt securities of $208 million, and $30 million of other securities. These amounts exclude receivables related to investment income and pending investment sales and payables related to pending investment purchases.
Sales of the securities held in the Funds resulted in cash proceeds of $237 million, $351 million, and $438 million in 2017, 2016, and 2015, respectively, all of which were reinvested. For 2017, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $125 million, which included $98 million related to unrealized gains on securities held in the Funds at December 31, 2017. For 2016, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $76 million, which included $34 million related to unrealized gains on securities held in the Funds at December 31, 2016. For 2015, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $8 million, which included $57 million related to unrealized losses on securities held in the Funds at December 31, 2015. While the investment securities held in the Funds are reported as trading securities, the Funds continue to be managed with a long-term focus. Accordingly, all purchases and sales within the Funds are presented separately in the statements of cash flows as investing cash flows, consistent with the nature of the securities and purpose for which the securities were acquired.
Amounts previously recorded in internal reserves are being transferred into the Funds through 2040 as approved by the Alabama PSC. The NRC's minimum external funding requirements are based on a generic estimate of the cost to decommission only the radioactive portions of a nuclear unit based on the size and type of reactor. The Company has filed a plan with the NRC designed to ensure that, over time, the deposits and earnings of the Funds will provide the minimum funding amounts prescribed by the NRC.
At December 31, the accumulated provisions for decommissioning were as follows:
 2017 2016
 (in millions)
External trust funds$902
 $790
Internal reserves18
 19
Total$920
 $809
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Site study cost is the estimate to decommission a facility as of the site study year. The estimated costs of decommissioning as of December 31, 2017 based on the most current study performed in 2013 for Plant Farley are as follows:
Decommissioning periods: 
Beginning year2037
Completion year2076
 (in millions)
Site study costs: 
Radiated structures$1,362
Non-radiated structures80
Total site study costs$1,442
The decommissioning cost estimates are based on prompt dismantlement and removal of the plant from service. The actual decommissioning costs may vary from the above estimates because of changes in the assumed date of decommissioning, changes in NRC requirements, or changes in the assumptions used in making these estimates.
For ratemaking purposes, the Company's decommissioning costs are based on the site study. Significant assumptions used to determine these costs for ratemaking were an inflation rate of 4.5% and a trust earnings rate of 7.0%. The next site study is expected to be completed in 2018.
Amounts previously contributed to the Funds are currently projected to be adequate to meet the decommissioning obligations. The Company will continue to provide site-specific estimates of the decommissioning costs and related projections of funds in the external trust to the Alabama PSC and, if necessary, would seek the Alabama PSC's approval to address any changes in a manner consistent with NRC and other applicable requirements.
Allowance for Funds Used During Construction
The Company records AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the plant through a higher rate base and higher depreciation. The equity component of AFUDC is not included in calculating taxable income. All current construction costs are included in retail rates. The AFUDC composite rate as of December 31 was 8.3% in 2017, 8.4% in 2016, and 8.7% in 2015. AFUDC, net of income taxes, as a percentage of net income after dividends on preferred and preference stock was 5.7% in 2017, 4.2% in 2016, and 9.3% in 2015.
Impairment of Long-Lived Assets and Intangibles
The Company evaluates long-lived assets for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance or an estimate of undiscounted future cash flows attributable to the assets, as compared with the carrying value of the assets. If an impairment has occurred, the amount of the impairment recognized is determined by either the amount of regulatory disallowance or by estimating the fair value of the assets and recording a loss if the carrying value is greater than the fair value. For assets identified as held for sale, the carrying value is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change.
Cash and Cash Equivalents
For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
Materials and Supplies
Generally, materials and supplies include the average cost of transmission, distribution, and generating plant materials. Materials are charged to inventory when purchased and then expensed or capitalized to plant, as appropriate, at weighted average cost when installed.
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Fuel Inventory
Fuel inventory includes the average cost of coal, natural gas, oil, transportation, and emissions allowances. Fuel is recorded to inventory when purchased and then expensed, at weighted average cost, as used and recovered by the Company through energy cost recovery rates approved by the Alabama PSC. Emissions allowances granted by the EPA are included in inventory at zero cost.
Financial Instruments
The Company uses derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, and electricity purchases and sales. All derivative financial instruments are recognized as either assets or liabilities on the balance sheets (included in "Other") and are measured at fair value. See Note 10 for additional information regarding fair value. Substantially all of the Company's bulk energy purchases and sales contracts that meet the definition of a derivative are excluded from fair value accounting requirements because they qualify for the "normal" scope exception, and are accounted for under the accrual method. Derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the Alabama PSC-approved fuel-hedging program result in the deferral of related gains and losses in OCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Any ineffectiveness arising from cash flow hedges is recognized currently in net income. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recorded on a net basis in the statements of income. Cash flows from derivatives are classified on the statement of cash flows in the same category as the hedged item. See Note 11 for additional information regarding derivatives.
The Company offsets fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a netting arrangement. Additionally, the Company had no outstanding collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2017.
The Company is exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Company has established controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk.
Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income, changes in the fair value of qualifying cash flow hedges, and reclassifications for amounts included in net income.
Variable Interest Entities
The primary beneficiary of a VIE is required to consolidate the VIE when it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE.
The Company has established a wholly-owned trust to issue preferred securities. See Note 6 under "Long-Term Debt Payable to an Affiliated Trust" for additional information. However, the Company is not considered the primary beneficiary of the trust. Therefore, the investment in the trust is reflected as other investments, and the related loan from the trust is reflected as long-term debt in the balance sheets.
2. RETIREMENT BENEFITS
The Company has a defined benefit, trusteed, pension plan covering substantially all employees. This qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2018. The Company also provides certain defined benefit pension plans for a selected group of management and highly compensated employees. Benefits under these non-qualified pension plans are funded on a cash basis. In addition, the Company provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The Company funds its other postretirement trusts to the extent required by the Alabama PSC and the FERC. For the year ending December 31, 2018, no other postretirement trusts contributions are expected.
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Actuarial Assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below.
Assumptions used to determine net periodic costs:2017 2016 2015
Pension plans     
Discount rate – benefit obligations4.44% 4.67% 4.18%
Discount rate – interest costs3.76
 3.90
 4.18
Discount rate – service costs4.85
 5.07
 4.49
Expected long-term return on plan assets7.95
 8.20
 8.20
Annual salary increase4.46
 4.46
 3.59
Other postretirement benefit plans     
Discount rate – benefit obligations4.27% 4.51% 4.04%
Discount rate – interest costs3.58
 3.69
 4.04
Discount rate – service costs4.70
 4.96
 4.40
Expected long-term return on plan assets6.83
 6.83
 7.17
Annual salary increase4.46
 4.46
 3.59
Assumptions used to determine benefit obligations:2017 2016
Pension plans   
Discount rate3.81% 4.44%
Annual salary increase4.46
 4.46
Other postretirement benefit plans   
Discount rate3.71% 4.27%
Annual salary increase4.46
 4.46
The Company estimates the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of eight different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio.
An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO as of December 31, 2017 were as follows:
 Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached
Pre-656.50% 4.50% 2026
Post-65 medical5.00
 4.50
 2026
Post-65 prescription10.00
 4.50
 2026
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An annual increase or decrease in the assumed medical care cost trend rate of 1% would affect the APBO and the service and interest cost components at December 31, 2017 as follows:
 
1 Percent
Increase
 
1 Percent
Decrease
 (in millions)
Benefit obligation$30
 $26
Service and interest costs1
 1
Pension Plans
The total accumulated benefit obligation for the pension plans was $2.7 billion at December 31, 2017 and $2.4 billion at December 31, 2016. Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$2,663
 $2,506
Service cost63
 57
Interest cost98
 95
Benefits paid(120) (109)
Actuarial (gain) loss294
 114
Balance at end of year2,998
 2,663
Change in plan assets   
Fair value of plan assets at beginning of year2,517
 2,279
Actual return (loss) on plan assets427
 206
Employer contributions12
 141
Benefits paid(120) (109)
Fair value of plan assets at end of year2,836
 2,517
Accrued liability$(162) $(146)
At December 31, 2017, the projected benefit obligations for the qualified and non-qualified pension plans were $2.9 billion and $126 million, respectively. All pension plan assets are related to the qualified pension plan.
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's pension plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$890
 $870
Other current liabilities(12) (12)
Employee benefit obligations(150) (134)
Presented below are the amounts included in regulatory assets at December 31, 2017 and 2016 related to the defined benefit pension plans that had not yet been recognized in net periodic pension cost along with the estimated amortization of such amounts for 2018.
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Alabama Power Company 2017 Annual Report

 2017 2016 
Estimated
Amortization
in 2018
 (in millions)
Prior service cost$8
 $10
 $1
Net (gain) loss882
 860
 54
Regulatory assets$890
 $870
  
The changes in the balance of regulatory assets related to the defined benefit pension plans for the years ended December 31, 2017 and 2016 are presented in the following table:
 2017 2016
 (in millions)
Regulatory assets:   
Beginning balance$870
 $822
Net (gain) loss64
 84
Change in prior service costs
 7
Reclassification adjustments:   
Amortization of prior service costs(2) (3)
Amortization of net gain (loss)(42) (40)
Total reclassification adjustments(44) (43)
Total change20
 48
Ending balance$890
 $870
Components of net periodic pension cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$63
 $57
 $59
Interest cost98
 95
 106
Expected return on plan assets(196) (184) (178)
Recognized net (gain) loss42
 40
 55
Net amortization2
 3
 6
Net periodic pension cost$9
 $11
 $48
Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Company has elected to amortize changes in the market value of all plan assets over five years rather than recognize the changes immediately. As a result, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets.
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Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2017, estimated benefit payments were as follows:
 
Benefit
Payments
 (in millions)
2018$129
2019134
2020139
2021143
2022148
2023 to 2027807
Other Postretirement Benefits
Changes in the APBO and in the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$501
 $505
Service cost6
 5
Interest cost17
 18
Benefits paid(29) (28)
Actuarial (gain) loss20
 (1)
Retiree drug subsidy2
 2
Balance at end of year517
 501
Change in plan assets   
Fair value of plan assets at beginning of year367
 363
Actual return (loss) on plan assets60
 23
Employer contributions6
 7
Benefits paid(27) (26)
Fair value of plan assets at end of year406
 367
Accrued liability$(111) $(134)
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's other postretirement benefit plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$63
 $86
Other regulatory liabilities, deferred(7) (10)
Employee benefit obligations(111) (134)
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Presented below are the amounts included in net regulatory assets (liabilities) at December 31, 2017 and 2016 related to the other postretirement benefit plans that had not yet been recognized in net periodic other postretirement benefit cost along with the estimated amortization of such amounts for 2018.
 2017 2016 
Estimated
Amortization
in 2018
 (in millions)
Prior service cost$11
 $15
 $4
Net (gain) loss45
 61
 1
Net regulatory assets$56
 $76
  
The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2017 and 2016 are presented in the following table:
 2017 2016
 (in millions)
Net regulatory assets (liabilities):   
Beginning balance$76
 $82
Net (gain) loss(15) 
Reclassification adjustments:   
Amortization of prior service costs(4) (4)
Amortization of net gain (loss)(1) (2)
Total reclassification adjustments(5) (6)
Total change(20) (6)
Ending balance$56
 $76
Components of the other postretirement benefit plans' net periodic cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$6
 $5
 $6
Interest cost17
 18
 20
Expected return on plan assets(25) (25) (26)
Net amortization5
 6
 5
Net periodic postretirement benefit cost$3
 $4
 $5
Future benefit payments, including prescription drug benefits, reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans. Estimated benefit payments are reduced by drug subsidy receipts expected as a result of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 as follows:
 
Benefit
Payments
 
Subsidy
Receipts
 Total
 (in millions)
2018$31
 $(2) $29
201932
 (2) 30
202033
 (3) 30
202134
 (3) 31
202235
 (3) 32
2023 to 2027173
 (14) 159
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Alabama Power Company 2017 Annual Report

Benefit Plan Assets
Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code of 1986, as amended. The Company's investment policies for both the pension plan and the other postretirement benefit plans cover a diversified mix of assets, including equity and fixed income securities, real estate, and private equity. Derivative instruments are used primarily to gain efficient exposure to the various asset classes and as hedging tools. The Company minimizes the risk of large losses primarily through diversification but also monitors and manages other aspects of risk.
The composition of the Company's pension plan and other postretirement benefit plan assets as of December 31, 2017 and 2016, along with the targeted mix of assets for each plan, is presented below:
 Target 2017 2016
Pension plan assets:     
Domestic equity26% 31% 29%
International equity25
 25
 22
Fixed income23
 24
 29
Special situations3
 1
 2
Real estate investments14
 13
 13
Private equity9
 6
 5
Total100% 100% 100%
Other postretirement benefit plan assets:     
Domestic equity42% 44% 44%
International equity22
 22
 20
Domestic fixed income28
 28
 29
Special situations1
 
 1
Real estate investments4
 4
 4
Private equity3
 2
 2
Total100% 100% 100%
The investment strategy for plan assets related to the Company's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Company employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.
Investment Strategies
Detailed below is a description of the investment strategies for each major asset category for the pension and other postretirement benefit plans disclosed above:
Domestic equity. A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.
International equity. A mix of growth stocks and value stocks with both developed and emerging market exposure, managed both actively and through passive index approaches.
Fixed income. A mix of domestic and international bonds.
Trust-owned life insurance (TOLI). Investments of the Company's taxable trusts aimed at minimizing the impact of taxes on the portfolio.
Special situations. Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies as well as investments in promising new strategies of a longer-term nature.
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Alabama Power Company 2017 Annual Report

Real estate investments. Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities.
Private equity. Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.
Benefit Plan Asset Fair Values
Following are the fair value measurements for the pension plan and the other postretirement benefit plan assets as of December 31, 2017 and 2016. The fair values presented are prepared in accordance with GAAP. For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate.
Valuation methods of the primary fair value measurements disclosed in the following tables are as follows:
Domestic and international equity.Investments in equity securities such as common stocks, American depositary receipts, and real estate investment trusts that trade on a public exchange are classified as Level 1 investments and are valued at the closing price in the active market. Equity investments with unpublished prices (i.e. pooled funds) are valued as Level 2, when the underlying holdings used to value the investment are comprised of Level 1 or Level 2 equity securities.
Fixed income.Investments in fixed income securities are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
TOLI. Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate account. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities.
Real estate investments, private equity, and special situations investments.Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.
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Alabama Power Company 2017 Annual Report

The fair values of pension plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 
Quoted Prices
in Active Markets for Identical Assets
 Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$572
 $276
 $
 $
 $848
International equity(*)
370
 333
 
 
 703
Fixed income:         
U.S. Treasury, government, and agency bonds
 200
 
 
 200
Mortgage- and asset-backed securities
 2
 
 
 2
Corporate bonds
 286
 
 
 286
Pooled funds
 155
 
 
 155
Cash equivalents and other51
 3
 
 
 54
Real estate investments111
 
 
 283
 394
Special situations
 
 
 43
 43
Private equity
 
 
 159
 159
Total$1,104
 $1,255
 $
 $485
 $2,844
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
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Alabama Power Company 2017 Annual Report

 Fair Value Measurements Using  
 
Quoted Prices
in Active Markets for Identical Assets
 Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$477
 $220
 $
 $
 $697
International equity(*)
292
 264
 
 
 556
Fixed income:         
U.S. Treasury, government, and agency bonds
 140
 
 
 140
Mortgage- and asset-backed securities
 3
 
 
 3
Corporate bonds
 235
 
 
 235
Pooled funds
 124
 
 
 124
Cash equivalents and other236
 1
 
 
 237
Real estate investments74
 
 
 274
 348
Special situations
 
 
 43
 43
Private equity
 
 
 130
 130
Total$1,079
 $987
 $
 $447
 $2,513
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
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Alabama Power Company 2017 Annual Report

The fair values of other postretirement benefit plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$52
 $12
 $
 $
 $64
International equity(*)
16
 14
 
 
 30
Fixed income:         
U.S. Treasury, government, and agency bonds
 11
 
 
 11
Corporate bonds
 12
 
 
 12
Pooled funds
 7
 
 
 7
Cash equivalents and other2
 
 
 
 2
Trust-owned life insurance
 253
 
 
 253
Real estate investments5
 
 
 12
 17
Special situations
 
 
 2
 2
Private equity
 
 
 7
 7
Total$75
 $309
 $
 $21
 $405
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
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Alabama Power Company 2017 Annual Report

 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$51
 $10
 $
 $
 $61
International equity(*)
13
 12
 
 
 25
Fixed income:         
U.S. Treasury, government, and agency bonds
 7
 
 
 7
Corporate bonds
 10
 
 
 10
Pooled funds
 5
 
 
 5
Cash equivalents and other14
 
 
 
 14
Trust-owned life insurance
 220
 
 
 220
Real estate investments4
 
 
 12
 16
Special situations
 
 
 2
 2
Private equity
 
 
 6
 6
Total$82
 $264
 $
 $20
 $366
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Employee Savings Plan
The Company also sponsors a 401(k) defined contribution plan covering substantially all employees. The Company matches a portion of the first 6% of employee base salary contributions. The maximum Company match is 5.1% of an employee's base salary. Total matching contributions made to the plan for 2017, 2016, and 2015 were $23 million, $23 million, and $22 million, respectively.
3. CONTINGENCIES AND REGULATORY MATTERS
General Litigation Matters
The Company is subject to certain claims and legal actions arising in the ordinary course of business. In addition, the Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters. The ultimate outcome of such pending or potential litigation against the Company cannot be predicted at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements.
Environmental Matters
Environmental Remediation
The Company must comply with environmental laws and regulations that cover the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Company could incur substantial costs to clean up affected sites. The Company conducts studies to determine the extent of any required cleanup and has recognized in its financial statements the estimated costs to clean up known sites. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The Company may be liable for some or all required cleanup costs for additional sites that may require
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Alabama Power Company 2017 Annual Report

environmental remediation. The Company recognizes a liability for environmental remediation costs only when it determines a loss is probable and reasonably estimable.
Nuclear Fuel Disposal Costs
Acting through the DOE and pursuant to the Nuclear Waste Policy Act of 1982, the U.S. government entered into a contract with the Company that requires the DOE to dispose of spent nuclear fuel and high level radioactive waste generated at Plant Farley beginning no later than January 31, 1998. The DOE has yet to commence the performance of its contractual and statutory obligation to dispose of spent nuclear fuel. Consequently, the Company has pursued and continues to pursue legal remedies against the U.S. government for its partial breach of contract.
In 2014, the Court of Federal Claims entered a judgment in favor of the Company in its spent nuclear fuel lawsuit seeking damages for the period from January 1, 2005 through December 31, 2010. In 2015, the Company recovered approximately $26 million, which was applied to reduce the cost of service for the benefit of customers.
In 2014, the Company filed a lawsuit against the U.S. government for the costs of continuing to store spent nuclear fuel at Plant Farley for the period from January 1, 2011 through December 31, 2013. The damage period was subsequently extended to December 31, 2014. On October 10, 2017, the Company filed an additional lawsuit against the U.S. government in the Court of Federal Claims for the costs of continuing to store spent nuclear fuel at Plant Farley for the period from January 1, 2015 through December 31, 2017. Damages will continue to accumulate until the issue is resolved or storage is provided. No amounts have been recognized in the financial statements as of December 31, 2017 for any potential recoveries from the pending lawsuits. The final outcome of these matters cannot be determined at this time. However, the Company expects to credit any recovery back for the benefit of customers in accordance with direction from the Alabama PSC and, therefore, no material impact on the Company's net income is expected.
At Plant Farley, on-site dry spent fuel storage facilities are operational and can be expanded to accommodate spent fuel through the expected life of the plant.
FERC Matters
The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies (including the Company) and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' (including the Company's) and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies (including the Company) and Southern Power filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies (including the Company) and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for the traditional electric operating companies' (including the Company's) and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies (including the Company) and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' (including the Company's) and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.
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Alabama Power Company 2017 Annual Report

On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' (including the Company's) and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies (including the Company) and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
The ultimate outcome of these matters cannot be determined at this time.
Retail Regulatory Matters
Rate RSE
The Alabama PSC has adopted Rate RSE that provides for periodic annual adjustments based upon the Company's projected weighted cost of equity (WCE) compared to an allowable range. Rate RSE adjustments are based on forward-looking information for the applicable upcoming calendar year. Retail rates remain unchanged when the WCE ranges between 5.75% and 6.21% with an adjusting point of 5.98% and eligibility for a performance-based adder of seven basis points, or 0.07%, to the WCE adjusting point if the Company (i) has an "A" credit rating equivalent with at least one of the recognized rating agencies or (ii) is in the top one-third of a designated customer value benchmark survey. Rate RSE adjustments for any two-year period, when averaged together, cannot exceed 4.0% and any annual adjustment is limited to 5.0%. If the Company's actual retail return is above the allowed WCE range, the excess will be refunded to customers unless otherwise directed by the Alabama PSC; however, there is no provision for additional customer billings should the actual retail return fall below the WCE range.
At December 31, 2016, the Company's retail return exceeded the allowed WCE range which resulted in the Company establishing a $73 million Rate RSE refund liability. In accordance with an Alabama PSC order issued on February 14, 2017, the Company applied the full amount of the refund to reduce the under recovered balance of Rate CNP PPA as discussed further below.
Effective in January 2017, Rate RSE increased 4.48%, or $245 million annually. At December 31, 2017, the Company's actual retail return was within the allowed WCE range. On December 1, 2017, the Company made its required annual Rate RSE submission to the Alabama PSC of projected data for calendar year 2018. Projected earnings were within the specified range; therefore, retail rates under Rate RSE remained unchanged for 2018.
In conjunction with Rate RSE, the Company has an established retail tariff that provides for an adjustment to customer billings to recognize the impact of a change in the statutory income tax rate. As a result of Tax Reform Legislation, the application of this tariff would reduce annual retail revenue by approximately $250 million over the remainder of 2018. The ultimate outcome of this matter cannot be determined at this time.
Rate CNP PPA
The Company's retail rates, approved by the Alabama PSC, provide for adjustments under Rate CNP to recognize the placing of new generating facilities into retail service. The Company may also recover retail costs associated with certificated PPAs under Rate CNP PPA. On March 7, 2017, the Alabama PSC issued a consent order that the Company leave in effect the current Rate CNP PPA factor for billings for the period April 1, 2017 through March 31, 2018. No adjustment to Rate CNP PPA is expected in 2018. As of December 31, 2017 and 2016, the Company had an under recovered Rate CNP PPA balance of $12 million and $142 million, respectively, which is included in deferred under recovered regulatory clause revenues in the balance sheet.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, the Company eliminated the under recovered balance in Rate CNP PPA at December 31, 2016, which totaled approximately $142 million. As discussed herein under "Rate RSE," the Company utilized the full amount of its $73 million Rate RSE refund liability to reduce the amount of the Rate CNP PPA under recovery and reclassified the remaining $69 million to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of the Company's next depreciation study, which is expected to occur within the next two to four years. The Company's current depreciation study became effective January 1, 2017.
Rate CNP Compliance
Rate CNP Compliance allows for the recovery of the Company's retail costs associated with laws, regulations, and other such mandates directed at the utility industry involving the environment, security, reliability, safety, sustainability, or similar considerations impacting the Company's facilities or operations. Rate CNP Compliance is based on forward-looking information
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Alabama Power Company 2017 Annual Report

and provides for the recovery of these costs pursuant to a factor that is calculated annually. Compliance costs to be recovered include operations and maintenance expenses, depreciation, and a return on certain invested capital. Revenues for Rate CNP Compliance, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor will have no significant effect on the Company's revenues or net income, but will affect annual cash flow. Changes in Rate CNP Compliance-related operations and maintenance expenses and depreciation generally will have no effect on net income.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, the Company reclassified $36 million of its under recovered balance in Rate CNP Compliance to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of the Company's next depreciation study, which is expected to occur within the next two to four years. The Company's current depreciation study became effective January 1, 2017.
On December 5, 2017, the Alabama PSC issued a consent order that the Company leave in effect for 2018 the factors associated with the Company's compliance costs for the year 2017, with any under-collected amount for prior years deemed recovered before any current year amounts. Any under recovered amounts associated with 2018 will be reflected in the 2019 filing. As of December 31, 2017 and 2016, the Company had a deferred under recovered regulatory clause revenues balance of $17 million and $9 million, respectively.
Rate ECR
The Company has established energy cost recovery rates under the Company's Rate ECR as approved by the Alabama PSC. Rates are based on an estimate of future energy costs and the current over or under recovered balance. Revenues recognized under Rate ECR and recorded on the financial statements are adjusted for the difference in actual recoverable fuel costs and amounts billed in current regulated rates. The difference in the recoverable fuel costs and amounts billed give rise to the over or under recovered amounts recorded as regulatory assets or liabilities. The Company, along with the Alabama PSC, continually monitors the over or under recovered cost balance to determine whether an adjustment to billing rates is required. Changes in the Rate ECR factor have no significant effect on the Company's net income, but will impact operating cash flows. Currently, the Alabama PSC may approve billing rates under Rate ECR of up to 5.910 cents per KWH.
In accordance with an accounting order issued on February 17, 2017 by the Alabama PSC, the Company reclassified $36 million of its under recovered balance in Rate ECR to a separate regulatory asset. The amortization of the new regulatory asset through Rate RSE will begin concurrently with the effective date of the Company's next depreciation study, which is expected to occur within the next two to four years. The Company's current depreciation study became effective January 1, 2017.
On December 5, 2017, the Alabama PSC issued a consent order that the Company leave in effect for 2018 the energy cost recovery rates which began in 2017. Therefore, the Rate ECR factor as of January 1, 2018 remained at 2.015 cents per KWH. The rate will return to 5.910 cents per KWH in 2019, absent a further order from the Alabama PSC.
At December 31, 2017, the Company's under recovered fuel costs totaled $25 million, which is included in deferred under recovered regulatory clause revenues. At December 31, 2016, the Company had an over recovered fuel balance of $76 million, which was included in other regulatory liabilities, current. These classifications are based on estimates, which include such factors as weather, generation availability, energy demand, and the price of energy. A change in any of these factors could have a material impactdeferred on the timing of any recovery or return of fuel costs.
Rate NDR
Based on an order from the Alabama PSC, the Company maintains a reserve for operations and maintenance expenses to cover the cost of damages from major storms to its transmission and distribution facilities. The order approves a separate monthly Rate NDR charge to customers consisting of two components. The first component is intended to establish and maintain a reserve balance for future storms and is an on-going part of customer billing. When the reserve balance falls below $50 million, a reserve establishment charge will be activated (and the on-going reserve maintenance charge concurrently suspended) until the reserve balance reaches $75 million. The second component of the Rate NDR charge is intended to allow recovery of any existing deferred storm-related operations and maintenance costs and any future reserve deficits over a 24-month period. The Alabama PSC order gives the Company authority to record a deficit balance in the NDR when costs of storm damage exceed any established reserve balance. Absent further Alabama PSC approval, the maximum total Rate NDR charge consisting of both components is $10 per month per non-residential customer account and $5 per month per residential customer account. The Company has the authority, based on an order from the Alabama PSC, to accrue certain additional amounts as circumstances warrant. The order allows for reliability-related expenditures to be charged against the additional accruals when the NDR balance exceeds $75 million. The Company may designate a portion of the NDR to reliability-related expenditures as a part of an annual budget process for the following year or during the current year for identified unbudgeted reliability-related expenditures that aresheets.
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Alabama Power Company 2017 Annual Report

incurred. Accruals that have not been designated can be used to offset storm charges. Additional accruals to the NDR will enhance the Company's ability to deal with the financial effects of future natural disasters, promote system reliability, and offset costs retail customers would otherwise bear. No such accruals were recorded or designated in any period presented.
In December 2017, the reserve maintenance charge was suspended and the reserve establishment charge was activated as a result of the NDR balance falling below $50 million. The Company expects to collect approximately $16 million annually until the reserve balance is restored to $75 million. The NDR balance at December 31, 2017 was $38 million.
As revenue from the Rate NDR charge is recognized, an equal amount of operations and maintenance expenses related to the NDR will also be recognized. As a result, the Rate NDR charge will not have an effect on net income but will impact operating cash flows.
Environmental Accounting Order
Based on an order from the Alabama PSC the Company(Environmental Accounting Order), Alabama Power is allowedauthorized to establish a regulatory asset to record the unrecovered investment costs, including the unrecovered plant asset balance and the unrecovered costs associated with site removal and closure associated with future unit retirements caused by environmental regulations. The
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regulatory asset will beis amortized and recovered over the affected unit's remaining useful life, as established prior to the decision regarding early retirement, through Rate CNP Compliance.
The Company retired Plant Gorgas Units 6 and 7 (200 MWs) andWith the completion of the Calhoun Generating Station acquisition, Alabama Power expected to retire Plant Barry Unit 3 (225 MWs)5 in 2015. Additionally, the Company ceased using coal atlate 2023 or early 2024, subject to certain operating conditions. In September 2022, Alabama Power reclassified approximately $600 million for Plant Barry Units 1Unit 5 from plant in service, net of depreciation to other utility plant, net and 2 (250 MWs) in 2015, but such units remain availablewill continue to depreciate the asset according to the original depreciation rates. Alabama Power has continued to evaluate operating conditions relevant to the expected retirement of Plant Barry Unit 5 and now expects to retire the unit on or before December 31, 2028. At retirement, Alabama Power will reclassify the remaining net investment costs of the unit to a limited basis with natural gas as the fuel source. In April 2016, the Company also ceased using coal at Plant Greene County Units 1 and 2 (300 MWs representing the Company's ownership interest) and began operating Units 1 and 2 solely on natural gas in June 2016 and July 2016, respectively.
In accordance with this accounting order from the Alabama PSC, the Company transferred the unrecovered plantregulatory asset balances to regulatory assets at their respective retirement dates. These regulatory assets are being amortized andbe recovered through Rate CNP Compliance over the units'unit's remaining useful lives,life, as established prior to the decision for retirement; therefore, these decisions associated with coal operations had no significant impact on the Company's financial statements.
4. JOINT OWNERSHIP AGREEMENTS
The Company and Georgia Power own equally all of the outstanding capital stock of SEGCO, which owns electric generating units with a total rated capacity of 1,020 MWs, as well as associated transmission facilities. SEGCO uses natural gas as the primary fuel source for 1,000 MWs of its generating capacity. The capacity of these units is sold equally to the Company and Georgia Power under a power contract. The Company and Georgia Power make payments sufficient to provide for the operating expenses, taxes, interest expense, and ROE. The Company's share of purchased power totaled $76 million in 2017, $55 million in 2016, and $76 million in 2015 and is included in "Purchased power from affiliates" in the statements of income. The Company accounts for SEGCO using the equity method.
In addition, the Company has guaranteed unconditionally the obligation of SEGCO under an installment sale agreement for the purchase of certain pollution control facilities at SEGCO's generating units, pursuant to which $25 million principal amount of pollution control revenue bonds are outstanding. The Company has guaranteed $100 million principal amount of unsecured senior notes issued by SEGCO for general corporate purposes. These senior notes mature on December 1, 2018. Georgia Power has agreed to reimburse the Company for the pro rata portion of such obligations corresponding to its then proportionate ownership of stock of SEGCO if the Company is called upon to make such payment under its guarantee.
At December 31, 2017, the capitalization of SEGCO consisted of $95 million of equity and $125 million of long-term debt on which the annual interest requirement is $4 million. In addition, SEGCO had short-term debt outstanding of $14 million. SEGCO paid $24 million of dividends in 2017 and 2016 compared to an immaterial amount in 2015, of which one-half of each was paid to the Company. In addition, the Company recognizes 50% of SEGCO's net income.
The Company, which owns and operates a generating unit adjacent to the SEGCO generating units, has a joint ownership agreement with SEGCO for the ownership of an associated gas pipeline. The Company owns 14% of the pipeline with the remaining 86% owned by SEGCO.
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In addition to the Company's ownership of SEGCO and joint ownership of an associated gas pipeline, the Company's percentage ownership and investment in jointly-owned generating plants at December 31, 2017 were as follows:
FacilityTotal MW Capacity Company Ownership  Plant in Service Accumulated Depreciation Construction Work in Progress
      (in millions)
Greene County500
 60.00%
(1) 
 $172
 $65
 $2
Plant Miller          
Units 1 and 21,320
 91.84%
(2) 
 1,717
 619
 54
(1)Jointly owned with an affiliate, Mississippi Power.
(2)Jointly owned with PowerSouth Energy Cooperative, Inc.
The Company has contracted to operate and maintain its jointly-owned facilities as agent for their co-owners. The Company's proportionate share of its plant operating expenses is included in operating expenses in the statements of income and the Company is responsible for providing its own financing.
5. INCOME TAXES
On behalf of the Company, Southern Company files a consolidated federal income tax return and various combined and separate state income tax returns. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.
Federal Tax Reform Legislation
Following the enactment of Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time.retire, through Rate CNP Compliance. See Note 3 under "Retail Regulatory Matters – Rate RSE" for additional information.
Current and Deferred Income Taxes
Details of income tax provisions are as follows:
 2017 2016 2015
 (in millions)
Federal —     
Current$136
 $103
 $110
Deferred336
 339
 320
 472
 442
 430
State —     
Current23
 20
 8
Deferred73
 69
 68
 96
 89
 76
Total$568
 $531
 $506
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The tax effects of temporary differences between the carrying amounts of assets and liabilities in the financial statements and their respective tax bases, which give rise to deferred tax assets and liabilities, are as follows:
 2017 2016
 (in millions)
Deferred tax liabilities —   
Accelerated depreciation$2,336
 $4,307
Property basis differences398
 456
Premium on reacquired debt16
 26
Employee benefit obligations162
 201
Regulatory assets associated with employee benefit obligations260
 393
Asset retirement obligations220
 289
Regulatory assets associated with asset retirement obligations249
 347
Other147
 179
Total3,788
 6,198
Deferred tax assets —   
Federal effect of state deferred taxes143
 266
Unbilled fuel revenue22
 36
Storm reserve5
 21
Employee benefit obligations286
 427
Other comprehensive losses10
 19
Asset retirement obligations469
 636
Other93
 139
Total1,028
 1,544
Accumulated deferred income taxes, net$2,760
 $4,654
The implementation of Tax Reform Legislation significantly reduced accumulated deferred income taxes, partially offset by bonus depreciation provisions in the 2015 Protecting Americans from Tax Hikes Act. Tax Reform Legislation also significantly reduced tax-related regulatory assets and increased tax-related regulatory liabilities.
At December 31, 2017, the tax-related regulatory assets to be recovered from customers were $240 million. These assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest.
At December 31, 2017, the tax-related regulatory liabilities to be credited to customers were $2.1 billion. These liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and to unamortized ITCs.
In accordance with regulatory requirements, deferred federal ITCs are amortized over the average life of the related property with such amortization normally applied as a credit to reduce depreciation in the statements of income. Credits amortized in this manner amounted to $7 million in 2017 and $8 million annually in 2016 and 2015. At December 31, 2017, the Company had federal ITC carryforwards which are expected to result in $9 million of federal income tax benefits. The federal ITC carryforwards begin expiring in 2038 but are expected to be fully utilized by 2027. The ultimate outcome of these matters cannot be determined at this time.
Tax Credit Carryforwards
The Company had state credit carryforwards for the state of Alabama of approximately $4 million, which begin expiring in 2023 but are expected to be fully utilized.
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Effective Tax Rate
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
 2017 2016 2015
Federal statutory rate35.0% 35.0% 35.0%
State income tax, net of federal deduction4.4 4.2 3.8
Non-deductible book depreciation0.9 1.0 1.2
AFUDC equity(1.0) (0.7) (1.6)
Tax Reform Legislation0.3  
Other (0.7) 
Effective income tax rate39.6% 38.8% 38.4%
In March 2016, the FASB issued ASU 2016-09, which changed the accounting for income taxes for share-based payment award transactions. Entities are required to recognize all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation as income tax expense or benefit in the income statement. The adoption of ASU 2016-09 did not have a material impact on the Company's overall effective tax rate. See Note 1 under "Recently Issued Accounting Standards" for additional information.
Unrecognized Tax Benefits
The Company has no material unrecognized tax benefits for the periods presented. The Company classifies interest on tax uncertainties as interest expense. Accrued interest for unrecognized tax benefits was immaterial and the Company did not accrue any penalties on uncertain tax positions.
It is reasonably possible that the amount of the unrecognized tax benefits could change within 12 months. The settlement of federal and state audits could impact the balances. At this time, an estimate of the range of reasonably possible outcomes cannot be determined.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2016. Southern Company is a participant in the Compliance Assurance Process of the IRS. The audits for the Company's state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2011.
6. FINANCING
Long-Term Debt Payable to an Affiliated Trust
The Company has formed a wholly-owned trust subsidiary for the purpose of issuing preferred securities. The proceeds of the related equity investments and preferred security sales were loaned back to the Company through the issuance of junior subordinated notes totaling $206 million outstanding as of December 31, 2017 and 2016, which constitute substantially all of the assets of this trust and are reflected in the balance sheets as long-term debt payable. The Company considers that the mechanisms and obligations relating to the preferred securities issued for its benefit, taken together, constitute a full and unconditional guarantee by it of the trust's payment obligations with respect to these securities. At December 31, 2017 and 2016, trust preferred securities of $200 million were outstanding. See Note 1 under "Variable Interest Entities" for additional information on the accounting treatment for this trust and the related securities.
Securities Due Within One Year
At December 31, 2017, the Company had no securities due within one year. At December 31, 2016, the Company had $561 million of senior notes and pollution control revenue bonds due within one year.
Maturities through 2022 applicable to total long-term debt are as follows: $200 million in 2019; $250 million in 2020; $310 million in 2021; and $750 million in 2022. There are no scheduled maturities in 2018.
Bank Term Loans
At both December 31, 2017 and 2016, the Company had $45 million of outstanding bank term loan agreements, which are reflected in the statements of capitalization as long-term debt.
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These bank loans have covenants that limit debt levels to 65% of total capitalization, as defined in the agreements. For purposes of calculating these covenants, any long-term notes payable to affiliated trusts are excluded from debt but included in capitalization. At December 31, 2017, the Company was in compliance with its debt limits.
Pollution Control Revenue Bonds
Pollution control revenue bond obligations represent loans to the Company from public authorities of funds or installment purchases of pollution control and solid waste disposal facilities financed by funds derived from sales by public authorities of revenue bonds. The Company is required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. The Company incurred no obligations related to the issuance of pollution control revenue bonds in 2017.
In August 2017, the Company repaid at maturity $36.1 million aggregate principal amount of Series 1993-A, 1993-B, and 1993-C Industrial Development Board of the City of Mobile, Alabama Pollution Control Revenue Refunding Bonds (Alabama Power Company Project).
The Company had $1.06 billion and $1.10 billion of tax-exempt pollution control revenue bond obligations outstanding at December 31, 2017 and 2016, respectively, including pollution control revenue bonds classified as due within one year.
Senior Notes
In March 2017, the Company issued $550 million aggregate principal amount of Series 2017A 2.45% Senior Notes due March 30, 2022. The proceeds were used to repay the Company's short-term indebtedness and for general corporate purposes, including the Company's continuous construction program.
In November 2017, the Company issued $550 million aggregate principal amount of Series 2017B 3.70% Senior Notes due December 1, 2047. The proceeds were used for general corporate purposes, including the Company's continuous construction program.
At December 31, 2017 and 2016, the Company had $6.4 billion and $5.8 billion of senior notes outstanding, respectively, including senior notes classified as due within one year. At December 31, 2017 and 2016, the Company did not have any outstanding secured debt.
Redeemable Preferred and Preference Stock
The Company currently has preferred stock, Class A preferred stock, and common stock outstanding. The Company also has authorized preference stock, none of which is outstanding. The Company's preferred stock and Class A preferred stock, without preference between classes, rank senior to the Company's common stock with respect to payment of dividends and voluntary and involuntary dissolution. The preferred stock and Class A preferred stock of the Company contain a feature that allows the holders to elect a majority of the Company's board of directors if preferred dividends are not paid for four consecutive quarters. Because such a potential redemption-triggering event is not solely within the control of the Company, the preferred stock and Class A preferred stock is presented as "Redeemable Preferred Stock" in a manner consistent with temporary equity under applicable accounting standards.
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Alabama Power Company 2017 Annual Report

The Company's preferred stock is subject to redemption at a price equal to the par value plus a premium. The Company's Class A preferred stock is subject to redemption at a price equal to the stated capital. All series of the Company's preferred stock currently are subject to redemption at the option of the Company. The Class A preferred stock is subject to redemption on or after October 1, 2022, or following the occurrence of a rating agency event. Information for each outstanding series is in the table below:
Preferred/Preference StockPar Value/Stated Capital Per Share
Shares Outstanding
Redemption Price Per Share
4.92% Preferred Stock$100
80,000

$103.23
4.72% Preferred Stock$100
50,000

$102.18
4.64% Preferred Stock$100
60,000

$103.14
4.60% Preferred Stock$100
100,000

$104.20
4.52% Preferred Stock$100
50,000

$102.93
4.20% Preferred Stock$100
135,115

$105.00
5.00% Class A Preferred Stock$25
10,000,000

Stated Capital(*)
(*)Prior to October 1, 2022: $25.50; on or after October 1, 2022: Stated Capital
In September 2017, the Company issued 10 million shares ($250 million aggregate stated capital) of 5.00% Class A Preferred Stock, Cumulative, Par Value $1 Per Share (Stated Capital 25 Per Share). The proceeds were used in October 2017 to redeem all 2 million shares ($50 million aggregate stated capital) of 6.50% Series Preference Stock, 6 million shares ($150 million aggregate stated capital) of 6.45% Series Preference Stock, and 1.52 million shares ($38 million aggregate stated capital) of 5.83% Class A Preferred Stock and for other general corporate purposes, including the Company's continuous construction program.
There were no changes for the year ended December 31, 2016 in redeemable preferred stock or preference stock of the Company.
Dividend Restrictions
The Company can only pay dividends to Southern Company out of retained earnings or paid-in-capital.
Bank Credit Arrangements
At December 31, 2017, committed credit arrangements with banks were as follows:
Expires     Expires Within One Year
2018 2020 2022 Total Unused Term Out No Term Out
(in millions)  (in millions) (in millions)
$35
 $500
 $800
 $1,335
 $1,335
 $
 $35
Most of the bank credit arrangements require payment of a commitment fee based on the unused portion of the commitments or the maintenance of compensating balances with the banks. Commitment fees average less than 1/4 of 1% for the Company. Compensating balances are not legally restricted from withdrawal.
Subject to applicable market conditions, the Company expects to renew or replace its bank credit agreements as needed, prior to expiration. In connection therewith, the Company may extend the maturity date and/or increase or decrease the lending commitments thereunder.
Most of the Company's bank credit arrangements contain covenants that limit the Company's debt level to 65% of total capitalization, as defined in the arrangements. For purposes of calculating these covenants, any long-term notes payable to affiliated trusts are excluded from debt but included in capitalization. At December 31, 2017, the Company was in compliance with the debt limit covenants.
A portion of the unused credit with banks is allocated to provide liquidity support to the Company's pollution control revenue bonds and commercial paper programs. The amount of variable rate pollution control revenue bonds outstanding requiring liquidity support was $854 million as of December 31, 2017. In addition, at December 31, 2017, the Company had $120 million of fixed rate pollution control revenue bonds outstanding that were required to be remarketed within the next 12 months.
The Company borrows through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above. The Company may also make short-term borrowings through various other arrangements with
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Alabama Power Company 2017 Annual Report

banks. At December 31, 2017, the Company had $3 million in short-term debt outstanding and none at December 31, 2016. At December 31, 2017, the Company had regulatory approval to have outstanding up to $2.0 billion of short-term borrowings.
7. COMMITMENTS
Fuel and Purchased Power Agreements
To supply a portion of the fuel requirements of its generating plants, the Company has entered into various long-term commitments for the procurement and delivery of fossil and nuclear fuel which are not recognized on the balance sheets. In 2017, 2016, and 2015, the Company incurred fuel expense of $1.2 billion, $1.3 billion, and $1.3 billion, respectively, the majority of which was purchased under long-term commitments. The Company expects that a substantial amount of its future fuel needs will continue to be purchased under long-term commitments.
In addition, the Company has entered into various long-term commitments for the purchase of capacity and electricity, some of which are accounted for as operating leases. Total capacity expense under PPAs accounted for as operating leases was $41 million, $42 million, and $38 million for 2017, 2016, and 2015, respectively. Total estimated minimum long-term obligations at December 31, 2017 were as follows:
 
Operating
Lease
PPAs
 (in millions)
2018$41
201943
202044
202146
202247
2023 and thereafter
Total commitments$221
SCS may enter into various types of wholesale energy and natural gas contracts acting as an agent for the Company and all of the other traditional electric operating companies and Southern Power. Under these agreements, each of the traditional electric operating companies and Southern Power may be jointly and severally liable. Accordingly, Southern Company has entered into keep-well agreements with the Company and each of the other traditional electric operating companies to ensure the Company will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of Southern Power as a contracting party under these agreements.
Operating Leases
The Company has entered into operating leases with Southern Linc and third parties for the use of cellular tower space. Substantially all of these agreements have initial terms ranging from five to 10 years and renewal options of up to 20 years. The Company has entered into rental agreements for towers, coal railcars, vehicles, and other equipment with various terms and expiration dates. Total rent expense under these agreements was $25 million in 2017, $18 million in 2016, and $19 million in 2015. Of these amounts, $11 million, $14 million, and $13 million for 2017, 2016, and 2015, respectively, relate to the railcar leases and was recovered through the Company's Rate ECR. The Company includes any step rents, fixed escalations, and lease concessions in its computation of minimum lease payments.
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As of December 31, 2017, estimated minimum lease payments under operating leases were as follows:
 
Minimum Lease Payments(a)
 
Affiliate Operating Leases(b)
 Railcars Vehicles & Other Total
   (in millions)    
2018$8
 $7
 $6
 $21
201910
 7
 5
 22
20208
 7
 3
 18
20217
 6
 1
 14
20225
 5
 
 10
2023 and thereafter16
 4
 
 20
Total$54
 $36
 $15
 $105
(a)Minimum lease payments have not been reduced by minimum sublease rentals of $3 million in the future.
(b)Includes operating leases for cellular tower space.
In addition to the above rental commitments payments, the Company has potential obligations upon expiration of certain railcar leases with respect to the residual value of the leased property. These leases have terms expiring through 2023 with maximum obligations under these leases of $12 million in 2023. There are no obligations under these leases through 2022. At the termination of the leases, the lessee may either exercise its purchase option, or the property can be sold to a third party. The Company expects that the fair market value of the leased property would substantially reduce or eliminate the Company's payments under the residual value obligations.
Guarantees
The Company has guaranteed the obligation of SEGCO for $25 million of pollution control revenue bonds issued in 2001, which mature in June 2019, and also $100 million of senior notes issued in 2013, which mature in December 2018. Georgia Power has agreed to reimburse the Company for the pro rata portion of such obligations corresponding to Georgia Power's then proportionate ownership of SEGCO's stock if the Company is called upon to make such payment under its guarantee. See Note 4 for additional information.
8. STOCK COMPENSATION
Stock-Based Compensation
Stock-based compensation primarily in the form of Southern Company performance share units and restricted stock units may be granted through the Omnibus Incentive Compensation Plan to a large segment of the Company's employees ranging from line management to executives. In 2015 and 2016, stock-based compensation consisted exclusively of performance share units. Beginning in 2017, stock-based compensation granted to employees includes restricted stock units in addition to performance share units. Prior to 2015, stock-based compensation also included stock options. As of December 31, 2017, there were 793 current and former employees participating in the stock option, performance share unit, and restricted stock unit programs.
Performance Share Units
Performance share units granted to employees vest at the end of a three-year performance period. All unvested performance share units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of performance share units granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company issues performance share units with performance goals based on three performance goals to employees. These include performance share units with performance goals based on the total shareholder return (TSR) for Southern Company common stock during the three-year performance period as compared to a group of industry peers, performance share units with performance goals based on Southern Company's cumulative earnings per share (EPS) over the performance period, and performance share units with performance goals based on Southern Company's equity-weighted ROE over the performance period.
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Alabama Power Company 2017 Annual Report

In 2015 and 2016, the EPS-based and ROE-based awards each represented 25% of the total target grant date fair value of the performance share unit awards granted. The remaining 50% of the total target grant date fair value consisted of TSR-based awards. Beginning in 2017, the total target grant date fair value of the stock compensation awards granted was comprised 20% each of EPS-based awards and ROE-based awards and 30% each of TSR-based awards and restricted stock units.
The fair value of TSR-based performance share unit awards is determined as of the grant date using a Monte Carlo simulation model to estimate the TSR of Southern Company's common stock among the industry peers over the performance period. The Company recognizes compensation expense on a straight-line basis over the three-year performance period without remeasurement.
The fair values of the EPS-based awards and the ROE-based awards are based on the closing stock price of Southern Company common stock on the date of the grant. Compensation expense for the EPS-based and ROE-based awards is generally recognized ratably over the three-year performance period initially assuming a 100% payout at the end of the performance period. Employees become immediately vested in the TSR-based performance share units, along with the EPS-based and ROE-based awards, upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. The expected payout related to the EPS-based and ROE-based awards is reevaluated annually with expense recognized to date increased or decreased based on the number of shares currently expected to be issued. Unlike the TSR-based awards, the compensation expense ultimately recognized for the EPS-based awards and the ROE-based awards will be based on the actual number of shares issued at the end of the performance period.
For the years ended December 31, 2017, 2016, and 2015, employees of the Company were granted performance share units of 135,502, 249,065, and 214,709, respectively. The weighted average grant-date fair value of TSR-based performance share units granted during 2017, 2016, and 2015, determined using a Monte Carlo simulation model to estimate the TSR of Southern Company's stock among the industry peers over the performance period, was $49.07, $45.15, and $46.42, respectively. The weighted average grant-date fair value of both EPS-based and ROE-based performance share units granted during 2017, 2016, and 2015 was $49.21, $48.86, and $47.78, respectively.
For the years ended December 31, 2017, 2016, and 2015, total compensation cost for performance share units recognized in income was $9 million, $15 million, and $13 million, respectively, with the related tax benefit also recognized in income of $4 million, $6 million, and $5 million, respectively. The compensation cost related to the grant of Southern Company performance share units to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. As of December 31, 2017, $2 million of total unrecognized compensation cost related to performance share award units will be recognized over a weighted-average period of approximately 21 months.
Restricted Stock Units
Beginning in 2017, stock-based compensation granted to employees included restricted stock units in addition to performance share units. One-third of the restricted stock units granted to employees vest each year throughout a three-year service period. All unvested restricted stock units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the vesting period.
The fair value of restricted stock units is based on the closing stock price of Southern Company common stock on the date of the grant. Since one-third of the restricted stock units vest each year throughout a three-year service period, compensation expense for restricted stock unit awards is generally recognized over the corresponding one-, two-, or three-year period. Employees become immediately vested in the restricted stock units upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility.
For the year ended December 31, 2017, employees of the Company were granted 58,001 restricted stock units. The weighted average grant-date fair value of restricted stock units granted during 2017 was $49.21.
For the year ended December 31, 2017, total compensation cost for restricted stock units recognized in income was $3 million with the related tax benefit also recognized in income of $1 million. As of December 31, 2017, total unrecognized compensation cost related to restricted stock units was immaterial.
Stock Options
In 2015, Southern Company discontinued the granting of stock options. Stock options expire no later than 10 years after the grant date and the latest possible exercise will occur no later than November 2024.
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Alabama Power Company 2017 Annual Report

The compensation cost related to the grant of Southern Company stock options to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. Compensation cost and related tax benefits recognized in the Company's financial statements were not material for any year presented. As of December 31, 2017, all compensation cost related to stock option awards has been recognized.
The total intrinsic value of options exercised during the years ended December 31, 2017, 2016, and 2015 was $12 million, $21 million, and $8 million, respectively. No cash proceeds are received by the Company upon the exercise of stock options. The actual tax benefit realized by the Company for the tax deductions from stock option exercises totaled $5 million, $8 million, and $3 million for the years ended December 31, 2017, 2016, and 2015, respectively. Prior to the adoption of ASU 2016-09 in 2016, the excess tax benefits related to the exercise of stock options were recognized in the Company's financial statements with a credit to equity. Upon the adoption of ASU 2016-09, beginning in 2016, all tax benefits related to the exercise of stock options are recognized in income. As of December 31, 2017, the aggregate intrinsic value for the options outstanding and exercisable was $17 million.
9. NUCLEAR INSURANCE
Under the Price-Anderson Amendments Act (Act), the Company maintains agreements of indemnity with the NRC that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at Plant Farley. The Act provides funds up to $13.4 billion for public liability claims that could arise from a single nuclear incident. Plant Farley is insured against this liability to a maximum of $450 million by American Nuclear Insurers (ANI), with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. The Company could be assessed up to $127 million per incident for each licensed reactor it operates but not more than an aggregate of $19 million per incident to be paid in a calendar year for each reactor. Such maximum assessment, excluding any applicable state premium taxes, for the Company is $255 million per incident but not more than an aggregate of $38 million to be paid for each incident in any one year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years. The next scheduled adjustment is due no later than September 10, 2018.
The Company is a member of Nuclear Electric Insurance Limited (NEIL), a mutual insurer established to provide property damage insurance in an amount up to $1.5 billion for members' operating nuclear generating facilities. Additionally, the Company has NEIL policies that currently provide decontamination, excess property insurance, and premature decommissioning coverage up to $1.25 billion for nuclear losses and policies providing coverage up to $750 million for non-nuclear losses in excess of the $1.5 billion primary coverage.
NEIL also covers the additional costs that would be incurred in obtaining replacement power during a prolonged accidental outage at a member's nuclear plant. Members can purchase this coverage, subject to a deductible waiting period of up to 26 weeks, with a maximum per occurrence per unit limit of $490 million. After the deductible period, weekly indemnity payments would be received until either the unit is operational or until the limit is exhausted. The Company purchases limits based on the projected full cost of replacement power and has elected a 12-week deductible waiting period.
Under each of the NEIL policies, members are subject to assessments each year if losses exceed the accumulated funds available to the insurer. The maximum annual assessments for the Company as of December 31, 2017 under the NEIL policies would be $55 million.
Claims resulting from terrorist acts are covered under both the ANI and NEIL policies (subject to normal policy limits). The aggregate, however, that NEIL will pay for all claims resulting from terrorist acts in any 12-month period is $3.2 billion plus such additional amounts NEIL can recover through reinsurance, indemnity, or other sources.
For all on-site property damage insurance policies for commercial nuclear power plants, the NRC requires that the proceeds of such policies shall be dedicated first for the sole purpose of placing the reactor in a safe and stable condition after an accident. Any remaining proceeds are to be applied next toward the costs of decontamination and debris removal operations ordered by the NRC, and any further remaining proceeds are to be paid either to the Company or to its debt trustees as may be appropriate under the policies and applicable trust indentures. In the event of a loss, the amount of insurance available might not be adequate to cover property damage and other expenses incurred. Uninsured losses and other expenses, to the extent not recovered from customers, would be borne by the Company and could have a material effect on the Company's financial condition and results of operations.
All retrospective assessments, whether generated for liability, property, or replacement power, may be subject to applicable state premium taxes.
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NOTES (continued)
Alabama Power Company 2017 Annual Report

10. FAIR VALUE MEASUREMENTS
Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement.
Level 1 consists of observable market data in an active market for identical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.
Level 3 consists of unobservable market data. The input may reflect the assumptions of the Company of what a market participant would use in pricing an asset or liability. If there is little available market data, then the Company's own assumptions are the best available information.
In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the level in the fair value hierarchy in which the fair value measurement is reported.
As of December 31, 2017, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Energy-related derivatives$
 $4
 $
 $
 $4
Nuclear decommissioning trusts:(*)
         
Domestic equity442
 81
 
 
 523
Foreign equity62
 59
 
 
 121
U.S. Treasury and government agency securities
 24
 
 
 24
Corporate bonds21
 160
 
 
 181
Mortgage and asset backed securities
 18
 
 
 18
Private equity
 
 
 29
 29
Other6
 
 
 
 6
Cash equivalents349
 
 
 
 349
Total$880
 $346
 $
 $29
 $1,255
Liabilities:         
Energy-related derivatives$
 $10
 $
 $
 $10
(*)Excludes receivables related to investment income, pending investment sales, and payables related to pending investment purchases. See Note 1 under "Nuclear Decommissioning" for additional information.
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NOTES (continued)
Alabama Power Company 2017 Annual Report

As of December 31, 2016, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Energy-related derivatives$
 $20
 $
 $
 $20
Nuclear decommissioning trusts:(*)


 

 

   

Domestic equity385
 72
 
 
 457
Foreign equity48
 47
 
 
 95
U.S. Treasury and government agency securities
 21
 
 
 21
Corporate bonds22
 146
 
 
 168
Mortgage and asset backed securities
 19
 
 
 19
Private equity
 
 
 20
 20
Other
 10
 
 
 10
Cash equivalents262
 
 
 
 262
Total$717
 $335
 $
 $20
 $1,072
Liabilities:         
Energy-related derivatives$
 $9
 $
 $
 $9
(*)Excludes receivables related to investment income, pending investment sales, and payables related to pending investment purchases. See Note 1 under "Nuclear Decommissioning" for additional information.
Valuation Methodologies
The energy-related derivatives primarily consist of over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The interest rate derivatives are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 11 for additional information on how these derivatives are used.
The NRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. For fair value measurements of the investments within the nuclear decommissioning trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. See Note 1 under "Nuclear Decommissioning" for additional information. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available.
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NOTES (continued)
Alabama Power Company 2017 Annual Report

As of December 31, 2017 and 2016, the fair value measurements of private equity investments held in the nuclear decommissioning trusts that are calculated at net asset value per share (or its equivalent) as a practical expedient, as well as the nature and risks of those investments, were as follows:
 
Fair
Value
 
Unfunded
Commitments
 Redemption Frequency 
Redemption
Notice Period
 (in millions)    
As of December 31, 2017$29
 $21
 Not Applicable Not Applicable
As of December 31, 2016$20
 $25
 
Not
Applicable
 Not Applicable
Private equity funds include a fund-of-funds that invests in high quality private equity funds across several market sectors, funds that invest in real estate assets, and a fund that acquires companies to create resale value. Private equity funds do not have redemption rights. Distributions from these funds will be received as the underlying investments in the funds are liquidated. Liquidations of these investments are expected to occur at various times over the next 10 years.
As of December 31, 2017 and 2016, other financial instruments for which the carrying amount did not equal fair value were as follows:
 
Carrying
Amount
 
Fair
Value
 (in millions)
Long-term debt, including securities due within one year:   
2017$7,625
 $8,305
2016$7,092
 $7,544
The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on the current rates available to the Company.
11. DERIVATIVES
The Company is exposed to market risks, including commodity price risk and interest rate risk. To manage the volatility attributable to these exposures, the Company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 10 for additional information. In the statements of cash flows, the cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities.
Energy-Related Derivatives
The Company enters into energy-related derivatives to hedge exposures to electricity, gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the Company has limited exposure to market volatility in energy-related commodity prices. The Company manages fuel-hedging programs, implemented per the guidelines of the Alabama PSC, through the use of financial derivative contracts, which is expected to continue to mitigate price volatility.
Energy-related derivative contracts are accounted for under one of two methods:
Regulatory Hedges – Energy-related derivative contracts which are designated as regulatory hedges relate primarily to the Company's fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through the energy cost recovery clause.
Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred.
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NOTES (continued)
Alabama Power Company 2017 Annual Report

Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric industry. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.
At December 31, 2017, the net volume of energy-related derivative contracts for natural gas positions totaled 69 million mmBtu for the Company, with the longest hedge date of 2020 over which it is hedging its exposure to the variability in future cash flows for forecasted transactions.
In addition to the volume discussed above, the Company enters into physical natural gas supply contracts that provide the option to sell back excess gas due to operational constraints. The expected volume of natural gas subject to such a feature is 5 million mmBtu.
Interest Rate Derivatives
The Company may also enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or losses is recorded in OCI and is reclassified into earnings at the same time the hedged transactions affect earnings. The derivatives employed as hedging instruments are structured to minimize ineffectiveness, which is recorded directly to earnings.
At December 31, 2017, there were no interest rate derivatives outstanding.
The estimated pre-tax losses related to interest rate derivatives that will be reclassified from accumulated OCI to interest expense for the 12-month period ending December 31, 2018 are $6 million. The Company has deferred gains and losses that are expected to be amortized into earnings through 2035.
Derivative Financial Statement Presentation and Amounts
The Company enters into energy-related and interest rate derivative contracts that may contain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.
At December 31, 2017 and 2016, the fair value of energy-related derivatives was reflected on the balance sheets as follows:
 20172016
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
 (in millions)
Derivatives designated as hedging instruments for regulatory purposes    
Energy-related derivatives:    
Other current assets/Other current liabilities$2
$6
$13
$5
Other deferred charges and assets/Other deferred credits and liabilities2
4
7
4
Total derivatives designated as hedging instruments for regulatory purposes$4
$10
$20
$9
Gross amounts recognized$4
$10
$20
$9
Gross amounts offset$(4)$(4)$(8)$(8)
Net amounts recognized in the Balance Sheets$
$6
$12
$1
Energy-related derivatives not designated as hedging instruments were immaterial on the balance sheets for 2017 and 2016.
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NOTES (continued)
Alabama Power Company 2017 Annual Report

At December 31, 2017 and 2016, the pre-tax effect of unrealized derivative gains (losses) arising from energy-related derivatives designated as regulatory hedging instruments and deferred were as follows:
 Unrealized Losses Unrealized Gains
Derivative Category
Balance Sheet
Location
2017 2016 
Balance Sheet
Location
2017 2016
  (in millions)  (in millions)
Energy-related derivatives:Other regulatory assets, current$(4) $(1) Other regulatory liabilities, current$1
 $8
 Other regulatory assets, deferred(3) 
 Other regulatory liabilities, deferred
 4
Total energy-related derivative gains (losses) $(7) $(1)  $1
 $12
For the years ended December 31, 2017, 2016, and 2015, the pre-tax effect of interest rate derivatives designated as cash flow hedging instruments on the statements of income was as follows:
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) Recognized in
OCI on Derivative
(Effective Portion)
 Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
  Amount
Derivative Category2017 2016 2015 
Statements of Income
Location
2017 2016 2015
 (in millions)  (in millions)
Interest rate derivatives$
 $(3) $(7) Interest expense, net of amounts capitalized$(6) $(6) $(3)
There was no material ineffectiveness recorded in earnings for any period presented.
The pre-tax effect of energy-related derivatives not designated as hedging instruments on the statements of income was not material for any year presented.
Contingent Features
The Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain affiliated companies.
At December 31, 2017, the fair value of derivative liabilities with contingent features was $1 million. However, because of joint and several liability features underlying these derivatives, the maximum potential collateral requirements arising from the credit-risk related contingent features, at a rating below BBB- and/or Baa3, were $12 million, and include certain agreements that could require collateral in the event that one or more Southern Company system power pool participants has a credit rating change to below investment grade.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. If collateral is required, fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty.
The Company maintains accounts with certain regional transmission organizations to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, the Company may be required to post collateral. At December 31, 2017, the Company's collateral posted in these accounts was not material.
The Company is exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Company has also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk. Therefore, the Company does not anticipate a material adverse effect on the financial statements as a result of counterparty nonperformance.
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NOTES (continued)
Alabama Power Company 2017 Annual Report

12. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Summarized quarterly financial information for 2017 and 2016 is as follows:
Quarter Ended
Operating
Revenues
 
Operating
Income
 Net Income After Dividends on Preferred and Preference Stock
 (in millions)
March 2017$1,382
 $376
 $174
June 20171,484
 454
 230
September 20171,740
 616
 325
December 20171,433
 268
 119
      
March 2016$1,331
 $333
 $156
June 20161,444
 430
 213
September 20161,785
 650
 351
December 20161,329
 252
 102
The Company's business is influenced by seasonal weather conditions.

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SELECTED FINANCIAL AND OPERATING DATA 2013-2017
Alabama Power Company 2017 Annual Report
 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions)$6,039
 $5,889
 $5,768
 $5,942
 $5,618
Net Income After Dividends
on Preferred and Preference Stock (in millions)
$848
 $822
 $785
 $761
 $712
Cash Dividends on Common Stock (in millions)$714
 $765
 $571
 $550
 $644
Return on Average Common Equity (percent)12.89
 13.34
 13.37
 13.52
 13.07
Total Assets (in millions)(a)(b)
$23,864
 $22,516
 $21,721
 $20,493
 $19,185
Gross Property Additions (in millions)$1,949
 $1,338
 $1,492
 $1,543
 $1,204
Capitalization (in millions):         
Common stock equity$6,829
 $6,323
 $5,992
 $5,752
 $5,502
Preference stock
 196
 196
 343
 343
Redeemable preferred stock291
 85
 85
 342
 342
Long-term debt(a)
7,628
 6,535
 6,654
 6,137
 6,195
Total (excluding amounts due within one year)$14,748
 $13,139
 $12,927
 $12,574
 $12,382
Capitalization Ratios (percent):         
Common stock equity46.3
 48.1
 46.4
 45.8
 44.4
Preference stock
 1.5
 1.5
 2.7
 2.8
Redeemable preferred stock2.0
 0.7
 0.7
 2.7
 2.7
Long-term debt(a)
51.7
 49.7
 51.4
 48.8
 50.1
Total (excluding amounts due within one year)100.0
 100.0
 100.0
 100.0
 100.0
Customers (year-end):         
Residential1,268,271
 1,262,752
 1,253,875
 1,247,061
 1,241,998
Commercial199,840
 199,146
 197,920
 197,082
 196,209
Industrial6,171
 6,090
 6,056
 6,032
 5,851
Other766
 762
 757
 753
 751
Total1,475,048
 1,468,750
 1,458,608
 1,450,928
 1,444,809
Employees (year-end)6,613
 6,805
 6,986
 6,935
 6,896
(a)A reclassification of debt issuance costs from Total Assets to Long-term debt of $40 million and $38 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(b)A reclassification of deferred tax assets from Total Assets of $20 million and $27 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.






















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SELECTED FINANCIAL AND OPERATING DATA 2013-2017 (continued)
Alabama Power Company 2017 Annual Report
 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions):
         
Residential$2,302
 $2,322
 $2,207
 $2,209
 $2,079
Commercial1,649
 1,627
 1,564
 1,533
 1,477
Industrial1,477
 1,416
 1,436
 1,480
 1,369
Other30
 (43) 27
 27
 27
Total retail5,458
 5,322
 5,234
 5,249
 4,952
Wholesale — non-affiliates276
 283
 241
 281
 248
Wholesale — affiliates97
 69
 84
 189
 212
Total revenues from sales of electricity5,831
 5,674
 5,559
 5,719
 5,412
Other revenues208
 215
 209
 223
 206
Total$6,039
 $5,889
 $5,768
 $5,942
 $5,618
Kilowatt-Hour Sales (in millions):
         
Residential17,219
 18,343
 18,082
 18,726
 17,920
Commercial13,606
 14,091
 14,102
 14,118
 13,892
Industrial22,687
 22,310
 23,380
 23,799
 22,904
Other198
 208
 201
 211
 211
Total retail53,710
 54,952
 55,765
 56,854
 54,927
Wholesale — non-affiliates5,415
 5,744
 3,567
 3,588
 3,711
Wholesale — affiliates4,166
 3,177
 4,515
 6,713
 7,672
Total63,291
 63,873
 63,847
 67,155
 66,310
Average Revenue Per Kilowatt-Hour (cents):
         
Residential13.37
 12.66
 12.21
 11.80
 11.60
Commercial12.12
 11.55
 11.09
 10.86
 10.63
Industrial6.51
 6.35
 6.14
 6.22
 5.98
Total retail10.16
 9.68
 9.39
 9.23
 9.02
Wholesale3.89
 3.95
 4.02
 4.56
 4.04
Total sales9.21
 8.88
 8.71
 8.52
 8.16
Residential Average Annual
Kilowatt-Hour Use Per Customer
13,601
 14,568
 14,454
 15,051
 14,451
Residential Average Annual
Revenue Per Customer
$1,819
 $1,844
 $1,764
 $1,775
 $1,676
Plant Nameplate Capacity
Ratings (year-end) (megawatts)
11,797
 11,797
 11,797
 12,222
 12,222
Maximum Peak-Hour Demand (megawatts):
         
Winter10,513
 10,282
 12,162
 11,761
 9,347
Summer10,711
 10,932
 11,292
 11,054
 10,692
Annual Load Factor (percent)
63.5
 63.5
 58.4
 61.4
 64.9
Plant Availability (percent):
         
Fossil-steam82.8
 83.0
 81.5
 82.5
 87.3
Nuclear97.6
 88.0
 92.1
 93.3
 90.7
Source of Energy Supply (percent):
         
Coal44.8
 47.1
 49.1
 49.0
 50.0
Nuclear22.2
 20.3
 21.3
 20.7
 20.3
Hydro5.4
 4.8
 5.6
 5.5
 8.1
Gas18.1
 17.1
 14.6
 15.4
 15.7
Purchased power —         
From non-affiliates4.6
 4.8
 4.4
 3.6
 2.9
From affiliates4.9
 5.9
 5.0
 5.8
 3.0
Total100.0
 100.0
 100.0
 100.0
 100.0

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GEORGIA POWER COMPANY
FINANCIAL SECTION

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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Georgia Power Company 2017 Annual Report
The management of Georgia Power Company (the Company) is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of the Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that the Company's internal control over financial reporting was effective as of December 31, 2017.

/s/ W. Paul Bowers
W. Paul Bowers
Chairman, President, and Chief Executive Officer

/s/ Xia Liu
Xia Liu
Executive Vice President, Chief Financial Officer, and Treasurer
February 20, 2018

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Georgia Power Company
Opinion on the Financial Statements
We have audited the accompanying balance sheets and statements of capitalization of Georgia Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, the related statements of income, comprehensive income, common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2017, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements (pages II-270 to II-321) present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018
We have served as the Company's auditor since 2002.
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DEFINITIONS
TermMeaning
2013 ARPAlternative Rate Plan approved by the Georgia PSC in 2013 for Georgia Power for the years 2014 through 2016 and subsequently extended through 2019
AFUDCAllowance for funds used during construction
Alabama PowerAlabama Power Company
AROAsset retirement obligation
ASCAccounting Standards Codification
ASUAccounting Standards Update
Bechtel                                                                Bechtel Power Corporation
CCRCoal combustion residuals
Clean Air ActClean Air Act Amendments of 1990
CO2
Carbon dioxide
Contractor Settlement AgreementThe December 31, 2015 agreement between Westinghouse and the Vogtle Owners resolving disputes between the Vogtle Owners and the EPC Contractor under the Vogtle 3 and 4 Agreement
CWIPConstruction work in progress
DOEU.S. Department of Energy
Eligible Project CostsCertain costs of construction relating to Plant Vogtle Units 3 and 4 that are eligible for financing under the loan guarantee program established under Title XVII of the Energy Policy Act of 2005
EPAU.S. Environmental Protection Agency
EPC ContractorWestinghouse and its affiliate, WECTEC Global Project Services Inc.; the former engineering, procurement, and construction contractor for Plant Vogtle Units 3 and 4
FASBFinancial Accounting Standards Board
FERCFederal Energy Regulatory Commission
FFBFederal Financing Bank
GAAPU.S. generally accepted accounting principles
Gulf PowerGulf Power Company
Interim Assessment AgreementAgreement entered into by the Vogtle Owners and the EPC Contractor to allow construction to continue after the EPC Contractor's bankruptcy filing
IRSInternal Revenue Service
ITCInvestment tax credit
KWHKilowatt-hour
LIBORLondon Interbank Offered Rate
Loan Guarantee AgreementLoan guarantee agreement entered into by Georgia Power with the DOE in 2014, under which the proceeds of borrowings may be used to reimburse Georgia Power for Eligible Project Costs incurred in connection with its construction of Plant Vogtle Units 3 and 4
LTSALong-term service agreement
Mississippi PowerMississippi Power Company
mmBtuMillion British thermal units
Moody'sMoody's Investors Service, Inc.
MWMegawatt
NCCRNuclear Construction Cost Recovery
NOX
Nitrogen oxide
NRCU.S. Nuclear Regulatory Commission
OCIOther comprehensive income
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DEFINITIONS
(continued)
TermMeaning
power poolThe operating arrangement whereby the integrated generating resources of the traditional electric operating companies and Southern Power (excluding subsidiaries) are subject to joint commitment and dispatch in order to serve their combined load obligations
PPAPower purchase agreement
PSCPublic Service Commission
PTCProduction tax credit
ROEReturn on equity
S&PS&P Global Ratings, a division of S&P Global Inc.
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECU.S. Securities and Exchange Commission
SEGCOSouthern Electric Generating Company
SO2
Sulfur dioxide
Southern CompanyThe Southern Company
Southern Company GasSouthern Company Gas and its subsidiaries
Southern Company systemSouthern Company, the traditional electric operating companies, Southern Power, Southern Company Gas (as of July 1, 2016), SEGCO, Southern Nuclear, SCS, Southern Linc, PowerSecure, Inc. (as of May 9, 2016), and other subsidiaries
Southern LincSouthern Communications Services, Inc.
Southern NuclearSouthern Nuclear Operating Company, Inc.
Southern PowerSouthern Power Company and its subsidiaries
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
ToshibaToshiba Corporation, parent company of Westinghouse
Toshiba GuaranteeCertain payment obligations of the EPC Contractor guaranteed by Toshiba
traditional electric operating companiesAlabama Power, Georgia Power Company, Gulf Power, and Mississippi Power
VCMVogtle Construction Monitoring
Vogtle 3 and 4 AgreementAgreement entered into with the EPC Contractor in 2008 by Georgia Power, acting for itself and as agent for the Vogtle Owners, pursuant to which the EPC Contractor agreed to design, engineer, procure, construct, and test Plant Vogtle Units 3 and 4
Vogtle OwnersGeorgia Power, Oglethorpe Power Corporation, the Municipal Electric Authority of Georgia, and the City of Dalton, Georgia, an incorporated municipality in the State of Georgia acting by and through its Board of Water, Light, and Sinking Fund Commissioners
Vogtle Services AgreementThe June 9, 2017 services agreement between the Vogtle Owners and the EPC Contractor, as amended and restated on July 20, 2017, for the EPC Contractor to transition construction management of Plant Vogtle Units 3 and 4 to Southern Nuclear and to provide ongoing design, engineering, and procurement services to Southern Nuclear
WestinghouseWestinghouse Electric Company LLC
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MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Georgia Power Company 2017 Annual Report
OVERVIEW
Business Activities
Georgia Power Company (the Company) operates as a vertically integrated utility providing electric service to retail customers within its traditional service territory located within the State of Georgia and to wholesale customers in the Southeast.
Many factors affect the opportunities, challenges, and risks of the Company's business of providing electric service. These factors include the ability to maintain a constructive regulatory environment, to maintain and grow energy sales, and to effectively manage and secure timely recovery of costs. These costs include those related to projected long-term demand growth, stringent environmental standards, reliability, fuel, capital expenditures, and restoration following major storms. The Company has various regulatory mechanisms that operate to address cost recovery. Effectively operating pursuant to these regulatory mechanisms and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the Company for the foreseeable future. The Company is required to file a base rate case with the Georgia PSC by July 1, 2019.
The Company continues to focus on several key performance indicators, including, but not limited to, customer satisfaction, plant availability, system reliability, the execution of major construction projects, and net income. The Company's financial success is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. Management uses customer satisfaction surveys to evaluate the Company's results and generally targets the top quartile of these surveys in measuring performance.
See RESULTS OF OPERATIONS herein for information on the Company's financial performance.
Nuclear Construction
In 2009, the Georgia PSC certified construction of Plant Vogtle Units 3 and 4. In 2012, the NRC issued the related combined construction and operating licenses, which allowed full construction of the two AP1000 nuclear units (with electric generating capacity of approximately 1,100 MWs each) and related facilities to begin. Until March 2017, construction on Plant Vogtle Units 3 and 4 continued under the Vogtle 3 and 4 Agreement, which was a substantially fixed price agreement. On March 29, 2017, the EPC Contractor filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code.
In connection with the EPC Contractor's bankruptcy filing, the Company, acting for itself and as agent for the Vogtle Owners, entered into the Interim Assessment Agreement with the EPC Contractor to allow construction to continue. The Interim Assessment Agreement expired on July 27, 2017 when the Vogtle Services Agreement became effective. In August 2017, following completion of comprehensive cost to complete and cancellation cost assessments, the Company filed its seventeenth VCM report with the Georgia PSC, which included a recommendation to continue construction of Plant Vogtle Units 3 and 4, with Southern Nuclear serving as project manager and Bechtel serving as the primary construction contractor. On December 21, 2017, the Georgia PSC approved the Company's recommendation to continue construction.
The Company expects Plant Vogtle Units 3 and 4 to be placed in service by November 2021 and November 2022, respectively. The Company's revised capital cost forecast for its 45.7% proportionate share of Plant Vogtle Units 3 and 4 is $8.8 billion ($7.3 billion after reflecting the impact of payments received under a settlement agreement regarding the Toshiba Guarantee (Guarantee Settlement Agreement) and certain refunds to customers ordered by the Georgia PSC (Customer Refunds)). The Company's CWIP balance for Plant Vogtle Units 3 and 4 was $3.3 billion at December 31, 2017, which is net of the Guarantee Settlement Agreement payments less the Customer Refunds. The Company estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Nuclear Construction" herein for additional information on Plant Vogtle Units 3 and 4.
Earnings
The Company's 2017 net income after dividends on preferred and preference stock was $1.4 billion, representing a $84 million, or 6.3%, increase over the previous year. The increase was due primarily to lower non-fuel operations and maintenance expenses, primarily as a result of cost containment and modernization initiatives, partially offset by lower revenues resulting from milder weather and lower customer usage as compared to 2016.
The Company's 2016 net income after dividends on preferred and preference stock was $1.3 billion, representing a $70 million, or 5.6%, increase over the previous year. The increase was due primarily to an increase in base retail revenues effective January 1,
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

2016, as authorized by the Georgia PSC, the 2015 correction of a customer billing error, and higher retail revenues in the third quarter 2016 due to warmer weather as compared to the corresponding period in 2015, partially offset by an expected refund to retail customers as a result of the Company's retail ROE exceeding the retail ROE range allowed under the 2013 ARP during 2016. Higher non-fuel operating expenses also partially offset the revenue increase.
See Note 1 to the financial statements under "General" and FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Rate Plans" herein for additional information related to the 2015 error correction and the refund to retail customers, respectively.
RESULTS OF OPERATIONS
A condensed income statement for the Company follows:
 Amount 
Increase (Decrease)
from Prior Year
 2017 2017 2016
 (in millions)
Operating revenues$8,310
 $(73) $57
Fuel1,671
 (136) (226)
Purchased power1,038
 159
 15
Other operations and maintenance1,653
 (307) 116
Depreciation and amortization895
 40
 9
Taxes other than income taxes409
 4
 14
Total operating expenses5,666
 (240) (72)
Operating income2,644
 167
 129
Interest expense, net of amounts capitalized419
 31
 25
Other income (expense), net33
 (5) (23)
Income taxes830
 50
 11
Net income1,428
 81
 70
Dividends on preferred and preference stock14
 (3) 
Net income after dividends on preferred and preference stock$1,414
 $84
 $70
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

Operating Revenues
Operating revenues for 2017 were $8.3 billion, reflecting a $73 million decrease from 2016. Details of operating revenues were as follows:
 Amount
 2017 2016
 (in millions)
Retail — prior year$7,772
 $7,727
Estimated change resulting from —   
Rates and pricing114
 154
Sales decline(33) (10)
Weather(166) 113
Fuel cost recovery51
 (212)
Retail — current year7,738
 7,772
Wholesale revenues —   
Non-affiliates163
 175
Affiliates26
 42
Total wholesale revenues189
 217
Other operating revenues383
 394
Total operating revenues$8,310
 $8,383
Percent change(0.9)% 0.7%
Retail revenues of $7.7 billion in 2017 decreased $34 million, or 0.4%, compared to 2016. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing was primarily due to an increase in revenues related to the recovery of Plant Vogtle Units 3 and 4 construction financing costs under the NCCR tariff.
Retail revenues of $7.8 billion in 2016 increased $45 million, or 0.6%, compared to 2015. The significant factors driving this change are shown in the preceding table. The increase in rates and pricing was primarily due to increases in base tariffs approved under the 2013 ARP and the NCCR tariff, all effective January 1, 2016, and the 2015 correction of a customer billing error. The increase was partially offset by an adjustment for an expected refund to retail customers as a result of the Company's retail ROE exceeding the retail ROE range allowed under the 2013 ARP during 2016.
See Note 1 to the financial statements under "General" for additional information on the customer billing error correction and Note 3 to the financial statements under "Retail Regulatory Matters – Rate Plans" and " – Nuclear Construction" for additional information on the rate changes. Also see "Energy Sales" below for a discussion of changes in the volume of energy sold, including changes related to sales decline and weather.
Electric rates include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these fuel cost recovery provisions, fuel revenues generally equal fuel expenses and do not affect net income. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Fuel Cost Recovery""Rate CNP New Plant" herein for additional information.
Wholesale revenues from power sales to non-affiliated utilities were as follows:
 2017 2016 2015
 (in millions)
Capacity and other$67
 $72
 $108
Energy96
 103
 107
Total non-affiliated$163
 $175
 $215
Wholesale capacity revenues from PPAs are recognized eitherIn December 2022, in conjunction with Alabama Power's compliance plan for the EPA's final steam electric ELG reconsideration rule, Plant Barry Unit 4 ceased using coal and began operating solely on a levelized basis over the appropriate contract period or the amounts billable under the contract terms and provide for recovery of fixed costs and a return on investment. Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of the Company's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not have a significant impact on net income. Short-term opportunity sales are made at market-based rates that generally provide a margin above the Company's variable cost of energy.
Wholesale revenues from non-affiliated sales decreased $12 million, or 6.9%, in 2017 as compared to 2016 and decreased $40 million, or 18.6%, in 2016 as compared to 2015. The decrease in 2017 was related to decreases of $5 million in capacity revenues and $7 million in energy revenues. The decrease in 2016 was related to decreases of $36 million in capacity revenues and $4 million in energy revenues. The decreases in capacity revenues reflect the expiration of wholesale contracts in the first and second quarters of 2016. The decrease in capacity revenues in 2016 also reflects the retirement of 14 coal-fired generating units since March 31, 2015 asnatural gas. As a result, of the Company's environmental compliance strategy. The decrease in energy revenues in 2017 was primarily due to lower demand and the effects of the expired contracts. The decrease in energy revenues in 2016 was primarily due to lower fuel prices. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Air Quality" herein for additional information regarding the Company's environmental compliance strategy.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the Intercompany Interchange Contract (IIC), as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost. In 2017, wholesale revenues from sales to affiliates decreased $16approximately $42 million as compared to 2016 due to a 42.8% decrease in KWH sales as a result of the lower market cost of available energy compared to the cost of Company-owned generation. In 2016, wholesale revenues from sales to affiliates increased $22 million as compared to 2015 due to a 153.5% increase in KWH sales as a result of the lower cost of Company-owned generation compared to the market cost of available energy, partially offset by lower coal and natural gas prices.
Other operating revenues decreased $11 million, or 2.8%, in 2017 from the prior year primarily due to a $15 million decrease in open access transmission tariff revenues, primarily as a result of the expiration of long-term transmission services contracts, and a $14 million adjustment in 2016 for customer temporary facilities services revenues, partially offset by a $13 million increase in outdoor lighting sales revenues due to increased sales in new and replacement markets, primarily attributable to LED conversions.
Other operating revenues increased $30 million, or 8.2%, in 2016 from the prior year primarily due to a $14 million increase related to customer temporary facilities services revenues and a $12 million increase in outdoor lighting revenues due to increased sales in new and replacement markets, primarily attributable to LED conversions.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2017 and the percent change from the prior year were as follows:
 
Total
KWHs
 
Total KWH
Percent Change
 
Weather-Adjusted
Percent Change
 2017 2017 2016 2017 2016
 (in billions)        
Residential26.1
 (5.2)% 3.5 % (0.2)% 1.0 %
Commercial32.2
 (2.4) 0.7
 (0.9) (1.0)
Industrial23.5
 (1.0) (0.2) (0.1) (0.9)
Other0.6
 (4.2) (3.5) (4.0) (3.5)
Total retail82.4
 (2.9) 1.3
 (0.4)% (0.4)%
Wholesale         
Non-affiliates3.3
 (4.0) (2.5)    
Affiliates0.8
 (42.8) 153.5
    
Total wholesale4.1
 (15.3) 18.8
    
Total energy sales86.5
 (3.6)% 2.1 %    
Changes in retail energy sales are generally the result of changes in electricity usage by customers, changes in weather, and changes in the number of customers.
In 2017, KWH sales for the residential class decreased 5.2% compared to 2016 primarily due to milder weather in 2017. Weather-adjusted residential KWH sales decreased by 0.2% primarily due to a decline in average customer usage resulting from an
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

increase in multi-family housing and energy saving initiatives, partially offset by customer growth. Weather-adjusted commercial KWH sales decreased by 0.9% primarily due to a decline in average customer usage resulting from an increase in electronic commerce transactions and energy saving initiatives, partially offset by customer growth. Weather-adjusted industrial KWH sales were essentially flat primarily due to decreased demand in the chemicals and paper sectors, offset by increased demand in the textile, non-manufacturing, and rubber sectors. Additionally, Hurricane Irma negatively impacted customer usage for all customer classes for the period.
In 2016, KWH sales for the residential class increased 3.5% compared to 2015 primarily due to warmer weather in the third quarter 2016 as compared to the corresponding period in 2015 and increased customer growth, partially offset by decreased customer usage. Weather-adjusted residential KWH sales increased by 1.0% primarily due to an increase of approximately 28,000 residential customers since December 31, 2015, partially offset by a decline in customer usage primarily resulting from an increase in multi-family housing and efficiency improvements in residential appliances and lighting. Weather-adjusted commercial KWH sales decreased by 1.0% primarily due to a decline in average customer usage resulting from an increase in electronic commerce transactions and energy saving initiatives, partially offset by an increase of approximately 2,600 commercial customers since December 31, 2015. Weather-adjusted industrial KWH sales decreased 0.9% primarily due to decreased demand in the pipeline, primary metals, stone, clay, and glass, and textile sectors, partially offset by increased demand in the non-manufacturing sector.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for the Company. The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, the Company purchases a portion of its electricity needs from the wholesale market.
Details of the Company's generation and purchased power were as follows:
 2017 2016 2015
Total generation (in billions of KWHs)
63.2
 68.4
 65.9
Total purchased power (in billions of KWHs)
26.9
 24.8
 25.6
Sources of generation (percent) —
     
Gas41
 38
 39
Coal32
 36
 34
Nuclear25
 24
 25
Hydro2
 2
 2
Cost of fuel, generated (in cents per net KWH) 
     
Gas2.68
 2.36
 2.47
Coal3.17
 3.28
 4.55
Nuclear0.83
 0.85
 0.78
Average cost of fuel, generated (in cents per net KWH)
2.36
 2.33
 2.77
Average cost of purchased power (in cents per net KWH)(*)
4.62
 4.53
 4.33
(*) Average cost of purchased power includes fuel purchased by the Company for tolling agreements where power is generated by the provider.
Fuel and purchased power expenses were $2.7 billion in 2017, an increase of $23 million, or 0.9%, compared to 2016. The increase was primarily due to an $84 million increase in the average cost of fuel and purchased power primarily related to higher natural gas prices, partially offset by a net decrease of $61 million related to the volume of KWHs generated and purchased primarily due to milder weather, resulting in lower customer demand.
Fuel and purchased power expenses were $2.7 billion in 2016, a decrease of $211 million, or 7.3%, compared to 2015. The decrease was primarily due to a $285 million net decrease in the average cost of fuel and purchased power due to lower coal and natural gas prices, partially offset by a $74 million net increase in the volume of KWHs generated and purchased to meet customer demand.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

Fuel and purchased power energy transactions do not have a significant impact on earnings since these fuel expenses are generally offset by fuel revenues through the Company's fuel cost recovery mechanism. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Fuel Cost Recovery" herein for additional information.
Fuel
Fuel expense was $1.7 billion in 2017, a decrease of $136 million, or 7.5%, compared to 2016. The decrease was primarily due to a decrease of 7.7% in the volume of KWHs generated largely due to milder weather, resulting in lower customer demand, partially offset by an increase of 13.6% in the average cost of natural gas per KWH generated. Fuel expense was $1.8 billion in 2016, a decrease of $226 million, or 11.1%, compared to 2015. The decrease was primarily due to a decrease of 18.6% in the average cost of coal and natural gas per KWH generated, partially offset by an increase of 10.0% in the volume of KWHs generated by coal.
Purchased Power - Non-Affiliates
Purchased power expense from non-affiliates was $416 million in 2017, an increase of $55 million, or 15.2%, compared to 2016. The increase was primarily due to a 13.4% increase in the volume of KWHs purchased primarily due to unplanned outages at Company-owned generating units. Purchased power expense from non-affiliates was $361 million in 2016, an increase of $72 million, or 24.9%, compared to 2015. The increase was primarily due to a 36.8% increase in the volume of KWHs purchased to meet customer demand, partially offset by a 12.5% decrease in the average cost per KWH purchased due to lower natural gas prices.
Energy purchases from non-affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
Purchased Power - Affiliates
Purchased power expense from affiliates was $622 million in 2017, an increase of $104 million, or 20.1%, compared to 2016. The increase was primarily due to a 7.0% increase in the volume of KWHs purchased to support Southern Company system transmission reliability and as a result of unplanned outages at Company-owned generating units and a 1.8% increase in the average cost per KWH purchased primarily resulting from higher natural gas prices. Purchased power expense from affiliates was $518 million in 2016, a decrease of $57 million, or 9.9%, compared to 2015. The decrease was primarily due to an 11.9% decrease in the volume of KWHs purchased due to the lower market cost of available energy as compared to Southern Company system resources, partially offset by a 6.2% increase in the average cost per KWH purchased.
Energy purchases from affiliates will vary depending on the demand and the availability and cost of generating resources at each company within the Southern Company system. These purchases are made in accordance with the IIC or other contractual agreements, all as approved by the FERC.
Other Operations and Maintenance Expenses
In 2017, other operations and maintenance expenses decreased $307 million, or 15.7%, compared to 2016. The decrease was primarily due to cost containment and modernization activities implemented in the third quarter 2016 that contributed to decreases of $85 million in generation maintenance costs, $49 million in employee benefits, $46 million in transmission and distribution overhead line maintenance, and $22 million in customer accounts and sales costs. Other factors include a $40 million increase in gains from sales of assets, a $19 million decrease in scheduled generation outage costs, and a $15 million decrease in customer assistance expenses, primarily in demand-side management costs related to the timing of new programs.
In 2016, other operations and maintenance expenses increased $116 million, or 6.3%, compared to 2015. The increase was primarily due to a $37 million decrease in gains from sales of assets, a $36 million charge in connection with cost containment activities, a $30 million increase in overhead line maintenance, a $15 million increase in hydro and gas generation maintenance, a $10 million increase in customer accounts, service, and sales costs, and a $7 million increase in material costs related to higher generation volumes. The increase was partially offset by a decrease of $36 million in pension costs.
See FUTURE EARNINGS POTENTIAL – "Other Matters" herein and Note 2 to the financial statements for additional information related to the cost containment and modernization activities and pension costs, respectively.
Depreciation and Amortization
Depreciation and amortization increased $40 million, or 4.7%, in 2017 compared to 2016. The increase was primarily due to a $33 million increase related to additional plant in service, and a $14 million decrease in amortizationnet of regulatory liabilities
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

related to other cost of removal obligations that expired in December 2016, partially offset by a $9 million decrease in depreciation related to generating unit retirements in 2016 and amortization of regulatory assets related to certain cancelled environmental and fuel conversion projects that expired in December 2016.
Depreciation and amortization increased $9 million, or 1.1%, in 2016 compared to 2015. The increase was primarily duereclassified to a $34 million increase related to additional plant in service and a $9 million increase in other cost of removal, partially offset by an $18 million decrease related to amortization of certain nuclear construction financing costs that was completed in December 2015 and a decrease of $16 million related to unit retirements.
See Note 1 to the financial statements under "Depreciation and Amortization" for additional information.
Taxes Other Than Income Taxes
In 2017, taxes other than income taxes increased $4 million, or 1.0%, compared to 2016. In 2016, taxes other than income taxes increased $14 million, or 3.6%, compared to 2015 primarily due to increases of $7 million in property taxes as a result of an increase in the assessed value of property and $4 million in payroll taxes.
Interest Expense, Net of Amounts Capitalized
In 2017, interest expense, net of amounts capitalized increased $31 million, or 8.0%, compared to the prior year primarily due to an increase in outstanding borrowings.
In 2016, interest expense, net of amounts capitalized increased $25 million, or 6.9%, compared to the prior year. The increase was primarily due to a $34 million increase in interest due to additional long-term borrowings from the FFB and higher interest rates on obligations for pollution control revenue bonds remarketed in 2015, partially offset by an increase of $4 million in AFUDC debt.
Other Income (Expense), Net
In 2017, other income (expense), net decreased $5 million compared to the prior year primarily due to a $10 million increase in donations and an $8 million decrease in AFUDC equity resulting from higher short-term borrowings, partially offset by a $7 million increase in third party infrastructure services revenue and a $6 million increase in wholesale operating fee revenue associated with contractual targets.
In 2016, other income (expense), net decreased $23 million compared to the prior year primarily due to decreases of $8 million in customer contributions in aid of construction, $6 million in wholesale operating fee revenue associated with contractual targets, and $4 million in gains on purchases of state tax credits.
Income Taxes
Income taxes increased $50 million, or 6.4%, in 2017 compared to the prior year primarily due to higher pre-tax earnings, partially offset by an adjustment related to Tax Reform Legislation. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Note 5 to the financial statements for additional information.
Income taxes increased $11 million, or 1.4%, in 2016 compared to the prior year primarily due to higher pre-tax earnings, partially offset by decreases in non-deductible book depreciation and increased state investment tax credits.
Dividends on Preferred and Preference Stock
Dividends on preferred and preference stock decreased $3 million, or 17.6%, in 2017 compared to the prior year due to the redemption in October 2017 of all outstanding shares of the Company's preferred and preference stock. See Note 6 to the financial statements under "Outstanding Classes of Capital Stock" for additional information.
Effects of Inflation
The Company is subject to rate regulation that is generally based on the recovery of historical and projected costs. The effects of inflation can create an economic loss since the recovery of costs could be in dollars that have less purchasing power. Any adverse effect of inflation on the Company's results of operations has not been substantial in recent years.
FUTURE EARNINGS POTENTIAL
General
The Company operates as a vertically integrated utility providing electric service to retail customers within its traditional service territory located in the State of Georgia and to wholesale customers in the Southeast. Prices for electricity provided by the
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Company to retail customers are set by the Georgia PSC under cost-based regulatory principles. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Retail rates and earnings are reviewed and may be adjusted periodically within certain limitations. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 3 to the financial statements under "Retail Regulatory Matters" for additional information about regulatory matters.
The results of operations for the past three years are not necessarily indicative of future earnings potential. The level of the Company's future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Company's business of providing electric service. These factors include the Company's ability to maintain a constructive regulatory environment that continues to allow for the timely recovery of prudently-incurred costs during a time of increasing costs and limited projected demand growth over the next several years. Plant Vogtle Units 3 and 4 construction and rate recovery are also major factors. Future earnings will be driven primarily by customer growth. Earnings will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies, increasing volumes of electronic commerce transactions, and higher multi-family home construction, all of which could contribute to a net reduction in customer usage. Earnings are subject to a variety of other factors. These factors include weather, competition, new energy contracts with other utilities, energy conservation practiced by customers, the use of alternative energy sources by customers, the price of electricity, the price elasticity of demand, and the rate of economic growth or decline in the Company's service territory. Demand for electricity is primarily driven by the pace of economic growth that may be affected by changes in regional and global economic conditions, which may impact future earnings.
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018, which, among other things, reduces the federal corporate income tax rate to 21% and changes rates of depreciation and the business interest deduction. See "Income Tax MattersFederal Tax Reform Legislation" and FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Notes 3 and 5 to the financial statements under "Retail Regulatory Matters – Rate Plans" and "Current and Deferred Income Taxes," respectively, for additional information.
Environmental Matters
The Company's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, and protection of other natural resources. The Company maintains a comprehensive environmental compliance strategy to assess upcoming requirements and compliance costs associated with these environmental laws and regulations. The costs, including capital expenditures and operations and maintenance costs, required to comply with environmental laws and regulations may impact future unit retirement and replacement decisions, results of operations, cash flows, and financial condition. Compliance costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, and adding or changing fuel sources for certain existing units, as well as related upgrades to the transmission system. A major portion of these compliance costs are expectedasset to be recovered through existing ratemaking provisions. The ultimate impact ofRate CNP Compliance through 2034, the environmental laws and regulations discussed below will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, and the outcome of pending and/or future legal challenges.unit's remaining useful life.
New or revised environmental laws and regulations could affect many areas of the Company's operations. The impact of any such changes cannot be determined at this time. Environmental compliance costs could affect earnings if such costs cannot continue to be fully recovered in rates on a timely basis. The Company's Environmental Compliance Cost Recovery (ECCR) tariff allows for the recovery of capital and operations and maintenance costs related to environmental controls mandated by state and federal regulations. Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity, which could negatively affect results of operations, cash flows, and financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affect their demand for electricity.
Through 2017, the Company has invested approximately $5.5 billion in environmental capital retrofit projects to comply with environmental requirements, with annual totals of approximately $0.3 billion, $0.2 billion, and $0.3 billion for 2017, 2016, and 2015, respectively. Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, the Company's current compliance strategy estimates capital expenditures of $1.2 billion from 2018 through 2022, with annual totals of approximately $0.5 billion, $0.1 billion, $0.2 billion, $0.2 billion, and $0.2 billion for 2018, 2019, 2020, 2021, and 2022, respectively. These estimates do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See "Global Climate Issues" herein for additional information. The Company also anticipates expenditures associated with ash pond closure and ground water monitoring under the Disposal of Coal Combustion Residuals from Electric Utilities rule (CCR Rule), which are reflected in the Company's ARO liabilities. See FINANCIAL
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CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
Environmental Laws and Regulations
Air Quality
The EPA has set National Ambient Air Quality Standards (NAAQS) for six air pollutants (carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and SO2), which it reviews and revises periodically. Revisions to these standards can require additional emission controls, improvements in control efficiency, or fuel changes which can result in increased compliance and operational costs. NAAQS requirements can also adversely affect the siting of new facilities. In 2015, the EPA published a more stringent eight-hour ozone NAAQS. The EPA plans to complete designations for this rule by no later than April 30, 2018 and intends to designate an eight-county area within metropolitan Atlanta as nonattainment. No other areas within the Company's service territory have been or are anticipated to be designated nonattainment under the 2015 ozone NAAQS. In 2010, the EPA revised the NAAQS for SO2, establishing a new one-hour standard, and is completing designations in multiple phases. The EPA has issued several rounds of area designations and no areas in the vicinity of Company-owned SO2 sources have been designated nonattainment under the 2010 one-hour SO2 NAAQS. However, final eight-hour ozone and SO2 one-hour designations for certain areas are still pending and, if other areas are designated as nonattainment in the future, increased compliance costs could result.
In 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) and its NOX annual, NOX seasonal, and SO2 annual programs. CSAPR is an emissions trading program that addresses the impacts of the interstate transport of SO2 and NOX emissions from fossil fuel-fired power plants located in upwind states in the eastern half of the U.S. on air quality in downwind states. The Company has fossil fuel-fired generation subject to these requirements. In October 2016, the EPA published a final rule that revised the CSAPR seasonal NOX program, establishing more stringent NOX emissions budgets in Alabama. Georgia's seasonal NOX budget remains unchanged. Increases in either future fossil fuel-fired generation or the cost of CSAPR allowances could have a negative financial impact on results of operations for the Company.
The EPA finalized regional haze regulations in 2005 and 2017. These regulations require states, tribal governments, and various federal agencies to develop and implement plans to reduce pollutants that impair visibility and demonstrate reasonable progress toward the goal of restoring natural visibility conditions in certain areas, including national parks and wilderness areas. States must submit a revised state implementation plan (SIP) to the EPA by July 31, 2021, demonstrating reasonable progress towards achieving visibility improvement goals. State implementation of reasonable progress could require further reductions in SO2 or NOX emissions, which could result in increased compliance costs.
In 2015, the EPA published a final rule requiring certain states (including Georgia and Alabama) to revise or remove the provisions of their SIPs regulating excess emissions at industrial facilities, including electric generating facilities, during periods of startup, shut-down, or malfunction (SSM). The state excess emission rules provide necessary operational flexibility to affected units during periods of SSM and, if removed, could affect unit availability and result in increased operations and maintenance costs for the Company. The EPA has not yet responded to the SIP revisions proposed by the State of Georgia.
Water Quality
In 2014, the EPA finalized requirements under Section 316(b) of the Clean Water Act (CWA) to regulate cooling water intake structures at existing power plants and manufacturing facilities in order to minimize their effects on fish and other aquatic life. The regulation requires plant-specific studies to determine applicable measures to protect organisms that either get caught on the intake screens (impingement) or are drawn into the cooling system (entrainment). The ultimate impact of this rule will depend on the outcome of these plant-specific studies and any additional protective measures required to be incorporated into each plant's National Pollutant Discharge Elimination System (NPDES) permit based on site-specific factors.
In 2015, the EPA finalized the steam electric effluent limitations guidelines (ELG) rule that set national standards for wastewater discharges from steam electric generating units. The rule prohibits effluent discharges of certain wastestreams and imposes stringent arsenic, mercury, selenium, and nitrate/nitrite limits on scrubber wastewater discharges. The revised technology-based limits and compliance dates may require extensive modifications to existing ash and wastewater management systems or the installation and operation of new ash and wastewater management systems. Compliance with the ELG rule is expected to require capital expenditures and increased operational costs primarily affecting the Company's coal-fired electric generation. Compliance applicability dates range from November 1, 2018 to December 31, 2023 with state environmental agencies incorporating specific applicability dates in the NPDES permitting process based on information provided for each waste stream. The EPA has committed to a new rulemaking that could potentially revise the limitations and applicability dates of the ELG rule. The EPA expects to finalize this rulemaking in 2020.
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In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) jointly published a final rule that revised the regulatory definition of waters of the United States (WOTUS) for all CWA programs. The rule significantly expanded the scope of federal jurisdiction over waterbodies (such as rivers, streams, and canals), which could impact new generation projects and permitting and reporting requirements associated with the installation, expansion, and maintenance of transmission and distribution projects. On July 27, 2017, the EPA and the Corps proposed to rescind the 2015 WOTUS rule. The WOTUS rule has been stayed by the U.S. Court of Appeals for the Sixth Circuit since late 2015, but on January 22, 2018, the U.S. Supreme Court determined that federal district courts have jurisdiction over the pending challenges to the rule. On February 6, 2018, the EPA and the Corps published a final rule delaying implementation of the 2015 WOTUS rule to 2020.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (CCR units) at active generating power plants. The CCR Rule requires CCR units to be evaluated against a set of performance criteria and potentially closed if minimum criteria are not met. Closure of existing CCR units could require installation of equipment and infrastructure to manage CCR in accordance with the rule. The EPA has announced plans to reconsider certain portions of the CCR Rule by no later than December 2019, which could result in changes to deadlines and corrective action requirements.
The EPA's reconsideration of the CCR Rule is due in part to a legislative development that impacts the potential oversight role of state agencies. Under the Water Infrastructure Improvements for the Nation Act, which became law in 2016, states are allowed to establish permit programs for implementing the CCR Rule. The Georgia Department of Natural Resources has incorporated the requirements of the CCR Rule into its solid waste regulations, which established additional requirements for all of the Company's CCR units, and has requested that the EPA approve its state permitting program.
Based on cost estimates for closure and monitoring of ash ponds pursuant to the CCR Rule, the Company recorded an update to the AROs for each CCR unit in 2015. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information regarding the Company's AROs as of December 31, 2017.
Environmental Remediation
The Company must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Company may also incur substantial costs to clean up affected sites. The Company conducts studies to determine the extent of any required cleanup and has recognized the estimated costs to clean up known impacted sites in its financial statements. Amounts for cleanup and ongoing monitoring costs were not material for any year presented. The Company may be liable for some or all required cleanup costs for additional sites that may require environmental remediation. See Notes 1 and 3 to the financial statements under "Environmental Remediation Recovery" and "Environmental Matters – Environmental Remediation," respectively, for additional information.
Global Climate Issues
In 2015, the EPA published final rules limiting CO2 emissions from new, modified, and reconstructed fossil fuel-fired electric generating units and guidelines for states to develop plans to meet EPA-mandated CO2 emission performance standards for existing units (known as the Clean Power Plan or CPP). In February 2016, the U.S. Supreme Court granted a stay of the CPP, which will remain in effect through the resolution of litigation in the U.S. Court of Appeals for the District of Columbia challenging the legality of the CPP and any review by the U.S. Supreme Court. On March 28, 2017, the U.S. President signed an executive order directing agencies to review actions that potentially burden the development or use of domestically produced energy resources, including review of the CPP and other CO2 emissions rules. On October 10, 2017, the EPA published a proposed rule to repeal the CPP and, on December 28, 2017, published an advanced notice of proposed rulemaking regarding a CPP replacement rule.
In 2015, parties to the United Nations Framework Convention on Climate Change, including the United States, adopted the Paris Agreement, which established a non-binding universal framework for addressing greenhouse gas (GHG) emissions based on nationally determined contributions. On June 1, 2017, the U.S. President announced that the United States would withdraw from the Paris Agreement and begin renegotiating its terms. The ultimate impact of this agreement or any renegotiated agreement depends on its implementation by participating countries.
The EPA's GHG reporting rule requires annual reporting of GHG emissions expressed in terms of metric tons of CO2 equivalent emissions for a company's operational control of facilities. Based on ownership or financial control of facilities, the Company's
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2016 GHG emissions were approximately 33 million metric tons of CO2 equivalent. The preliminary estimate of the Company's 2017 GHG emissions on the same basis is approximately 30 million metric tons of CO2 equivalent.
FERC Matters
The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies (including the Company) and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' (including the Company's) and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies (including the Company) and Southern Power filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies (including the Company) and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for the traditional electric operating companies' (including the Company's) and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies (including the Company) and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' (including the Company's) and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.
On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' (including the Company's) and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies (including the Company) and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
The ultimate outcome of these matters cannot be determined at this time.
Retail Regulatory Matters
The Company's revenues from regulated retail operations are collected through various rate mechanisms subject to the oversight of the Georgia PSC. The Company currentlyGeorgia Power recovers its costs from the regulated retail business through the 2013 ARP, which includes traditional base tariff rates,tariffs, Demand-Side Management (DSM) tariffs, the ECCR tariffs,tariff, and Municipal Franchise Fee (MFF) tariffs. These tariffs were set under the 2019 ARP for the years 2020 through 2022 and under the 2022 ARP for the years 2023 through 2025 as described herein. In addition, financing costs on certified project costs related to the construction of Plant Vogtle Units 3 and 4 are being collected through the NCCR tariff and fuel costs are collected through a separate fuel cost recovery tariff.
See Note 3 to the financial statements under "Retail"Nuclear Construction Regulatory Matters" herein for information regarding the approved recovery through retail base rates of certain costs related to Plant Vogtle Unit 3 and the common facilities shared between Plant Vogtle Units 3 and 4 (Common Facilities) that became effective August 1, 2023 based on the in-service date of July 31, 2023 for Unit 3, as well as the base rate adjustments that will occur the first day of the month after Unit 4 achieves commercial operation. Financing costs on certified construction costs of Plant Vogtle Units 3 and 4 that are not included in rate base are being collected through Georgia Power's NCCR tariff. When the base rate adjustments occur following commercial operation of Unit 4, the NCCR tariff will cease to be collected and financing costs will be included in Georgia Power's general retail revenue requirements. See "Nuclear Construction" herein for additional information.information on Plant Vogtle Units 3 and 4.
Rate Plans
2022 ARP
In December 2022, the Georgia PSC voted to approve the 2022 ARP, under which Georgia Power increased its rates on January 1, 2023. On JanuaryNovember 16, 2018,2023, the Georgia PSC approved the Company's saletariff adjustments effective January 1, 2024. Details of its natural gas lateral pipeline serving Plant McDonough Units 4 through 6 to Southern Natural Gas, L.L.C. (SNG) at net book value. Pursuant to this approval, legal transfer of the lateral pipeline is expected to occurtariff adjustments are provided in the fourth quarter 2018following table:
Tariff20232024
(in millions)
Traditional base$194 $275 
ECCR(21)(99)
DSM37 10 
MFF
Total$216 $191 
Under the 2022 ARP, Georgia Power will adjust traditional base, ECCR, DSM, and payment of $142 million is expectedMFF rates effective January 1, 2025, with the incremental revenue requirements related to occur in the first quarter 2020. Completion of this sale is contingent on certain conditionsDSM tariffs and CCR AROs subject to updates through annual compliance filings to be satisfied by SNG that include, among other things, expansion of the existing lateral pipeline. Southern Company Gas, an affiliate of the Company, owns a 50% equity interest in SNG. The ultimate outcome of this matter cannot be determinedmade at this time; however, no material impact on the Company's financial statements is expected.
Rate Plans
Pursuantleast 90 days prior to the terms and conditions of a settlement agreement related to Southern Company's acquisition of Southern Company Gas approved byeffective date.
In the Georgia PSC in April 2016, the 2013 ARP will continue in effect until December 31, 2019, and the Company will be required to file its next base rate case by July 1, 2019. Furthermore, through December 31, 2019, the Company and Atlanta
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Gas Light Company each will retain their respective merger savings, net of transition costs, as defined in the settlement agreement; through December 31, 2022 such net merger savings applicable to each will be shared on a 60/40 basis with their respective customers; thereafter, all merger savings will be retained by customers. See Note 3 to the financial statements under "Retail Regulatory Matters – Rate Plans" for additional information regarding the 2013 ARP.
In accordance with the 2013 ARP, the Georgia PSC approved increases to tariffs effectiverecovery through the ECCR tariff of estimated CCR ARO compliance costs for 2023, 2024, and 2025 over four-year periods beginning January 1 2016 as follows: (1) traditional base tariff rates by approximately $49 million; (2) ECCR tariff by approximately $75 million; (3) DSM tariffs by approximately $3 million;of each respective year, with recovery of construction contingency beginning in the year following actual expenditures, resulting in $60 million and (4) MFF tariff by approximately $13$20 million reductions in the related amortization expense for a total increase2024 and 2023, respectively. Compliance costs incurred were $300 million in base revenues2023 and are expected to be $305 million and $330 million in 2024 and 2025, respectively. The CCR ARO costs are expected to be revised for actual expenditures and updated estimates through future annual compliance filings.
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Table of approximately $140 million. There were no changesContentsIndex to these tariffs in 2017.Financial Statements
Under
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Further, under the 20132022 ARP, the Company'sGeorgia Power's retail ROE is set at 10.95%10.50% and earnings areits equity ratio is set at 56%. Earnings will be evaluated against a retail ROE range of 10.00%9.50% to 12.00%11.90%. Two-thirds of anyAny retail earnings above 12.00%11.90% will be shared, with 40% being applied to reduce regulatory assets, 40% directly refunded to customers, withand the remaining one-third20% retained by the Company.Georgia Power. There will be no recovery of any earnings shortfall below 10.00%9.50% on an actual basis. However, if at any time during the term of the 2022 ARP, Georgia Power projects that its retail earnings will be below 9.50% for any calendar year, it may petition the Georgia PSC for implementation of the Interim Cost Recovery (ICR) tariff to adjust Georgia Power's retail rates to achieve a 9.50% ROE. The Georgia PSC would have 90 days to rule on Georgia Power's request. The ICR tariff would expire at the earlier of January 1, 2026 or the end of the calendar year in which the ICR tariff becomes effective. In 2015,lieu of requesting implementation of an ICR tariff, or if the Company'sGeorgia PSC chooses not to implement the ICR tariff, Georgia Power may file a full rate case. In 2023, Georgia Power's retail ROE was within the allowed retail ROE range.
Except as provided above, Georgia Power will not file for a general base rate increase while the 2022 ARP is in effect. Georgia Power is required to file a general base rate case by July 1, 2025, in response to which the Georgia PSC would be expected to determine whether the 2022 ARP should be continued, modified, or discontinued.
2019 ARP
The Georgia PSC approved the following tariff adjustments under the 2019 ARP effective January 1 2022:
Tariff2022
(in millions)
Traditional base$192 
ECCR(12)
DSM(25)
MFF
Total$157 
In the 2019 ARP, the Georgia PSC approved recovery through the ECCR tariff of the estimated under recovered balance of CCR ARO compliance costs. Under the 2019 ARP, the under recovered balance at December 31, 2019 and compliance costs for 2020 were recovered over the three-year period ended December 31, 2022. Recovery of estimated compliance costs for 2021 and 2022 are being recovered over four-year periods beginning January 1 of each respective year, as authorized under the 2019 ARP and modified under the 2022 ARP, with recovery of construction contingency beginning in the year following actual expenditure. The CCR ARO costs recovered through the ECCR tariff are revised for actual expenditures and updated estimates through annual compliance filings, which resulted in an approximate $10 million increase effective January 1, 2022 in the related cost recovery.
Georgia Power's retail ROE under the 2019 ARP was set at 10.50% and earnings were evaluated against a retail ROE range of 9.50% to 12.00%. Any retail earnings above 12.00% were shared, with 40% applied to reduce regulatory assets, 40% directly refunded to customers, and the remaining 20% retained by Georgia Power. In 2020, Georgia Power's retail ROE was within the allowed retail ROE range. In 2016, the Company's2021, Georgia Power's retail ROE exceeded 12.00%, and Georgia Power reduced regulatory assets by approximately $5 million and accrued approximately $5 million which was refunded to customers in 2022. In 2022, Georgia Power's retail ROE exceeded 12.00%, and Georgia Power reduced regulatory assets by $117 million and refunded $117 million to customers through bill credits in the Company will refund to retail customers approximately $44 million in 2018,first quarter 2023.
Integrated Resource Plans
In July 2022, the Georgia PSC approved Georgia Power's 2022 IRP, as approvedmodified by a stipulated agreement among Georgia Power, the staff of the Georgia PSC, and certain intervenors and as further modified by the Georgia PSC. In the 2022 IRP decision, the Georgia PSC on January 16, 2018. In 2017,approved, among other things, the Company's retail ROE was within the allowed retail ROE range,certification of six PPAs (including five affiliate PPAs with Southern Power that are subject to review and approval by the FERC) with capacities of 1,567 MWs beginning in 2024, 380 MWs beginning in 2025, and 228 MWs beginning in 2028, procured through RFPs authorized in the 2019 IRP. See Note 9 for additional information.
On October 27, 2023, Georgia PSC.Power filed an updated IRP (2023 IRP Update) with the Georgia PSC, which sets forth a plan to support the recent increase in the state of Georgia's projected energy needs since the 2022 IRP. In the 2023 IRP Update, Georgia Power requested the following:
Authority to develop, own, and operate up to 1,400 MWs from three simple cycle combustion turbines at Plant Yates.
Certification of an affiliate PPA with Mississippi Power for 750 MWs, which began January 1, 2024 and will continue through December 2028.
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Certification of a non-affiliate PPA for 230 MWs starting the month after conclusion of the 2023 IRP Update proceeding continuing through December 2028.
Authority to develop, own, and operate up to 1,000 MWs of battery energy storage system facilities, including storage systems collocated with existing and new Georgia Power-owned solar facilities.
Approval of transmission projects necessary to support the generation resources requested in the 2023 IRP Update.
The 2023 IRP Update assumes a retirement date at the end of 2035 for Plant Bowen Units 1 and 2 (1,400 MWs). Georgia Power expects to make a formal recommendation in the 2025 IRP on the retirement or continued operations for Plant Bowen Units 1 and 2, as well as evaluate extending the operation of Plant Scherer Unit 3 (614 MWs based on 75% ownership) and Plant Gaston Units 1 through 4 (500 MWs based on 50% ownership through SEGCO) beyond the retirement dates in 2028 that were approved in the 2022 IRP. See Note 7 under "SEGCO" for additional information.
Georgia Power expects the Georgia PSC to render a final decision on the 2023 IRP Update on April 16, 2024.
On January 19, 2018,12, 2024, Georgia Power entered into an Agreement for Engineering, Procurement, and Construction with Mitsubishi Power Americas, Inc. and Black & Veatch Construction, Inc. to construct three 442-MW simple cycle combustion turbine units at Plant Yates (Plant Yates Units 8, 9, and 10), which are expected to be placed in service in the Georgia PSC issued an order onfourth quarter 2026, the Tax Reform Legislation, which was amended on February 16, 2018 (Tax Order). In accordance withsecond quarter 2027, and the Tax Order, the Company is required to submit its analysis of the Tax Reform Legislation and related recommendations to address the related impacts on the Company's cost of service and annual revenue requirements by March 6, 2018. third quarter 2027, respectively.
The ultimate outcome of this matterthese matters cannot be determined at this time.
Integrated Resource Plan
See "Environmental Matters" herein for additional information regarding proposedIn August 2022, Restore Chattooga Gorge Coalition (RCG) filed a petition in the Superior Court of Fulton County, Georgia against Georgia Power and final EPA rules and regulations, including revisions to ELG for steam electric power plants and additional regulations of CCR and CO2.
In July 2016, the Georgia PSC approved the Company's triennial Integrated Resource Plan (2016 IRP) including the decertification and retirement ofPSC. The petition challenged Georgia Power's plan to expend $115 million to modernize Plant Mitchell Units 3, 4A, and 4B (217 MWs) and Plant Kraft Unit 1 (17 MWs)Tugalo (a hydro facility), as well asapproved in the decertification2019 IRP, and sought judicial review of the Intercession City unit (143 MWs total capacity). In August 2016,Georgia PSC's order in the Plant Mitchell and Plant Kraft units were retired2022 IRP proceeding with respect to the denial of RCG's challenge to the modernization plan. On October 23, 2023, the court granted Georgia Power's and the Company sold its 33% ownership interest inGeorgia PSC's motions to dismiss the Intercession City unit to Duke Energy Florida, LLC.
Additionally, the Georgia PSC approved the Company's environmental compliance strategy and related expenditures proposed in the 2016 IRP, including measures taken to comply with existing government-imposed environmental mandates, subject to limits on expenditures for Plant McIntosh Unit 1 and Plant Hammond Units 1 through 4.
The Georgia PSC approved the reclassification of the remaining net book value of Plant Mitchell Unit 3 and costs associated with materials and supplies remaining at the unit retirement date to a regulatory asset. Recovery of the unit's net book value will continue through December 31, 2019, as provided in the 2013 ARP. The timing of the recovery of the remaining balance of the unit's net book value as of December 31, 2019 and costs associated with materials and supplies remaining at the unit retirement date was deferred for consideration in the Company's 2019 base rate case.
The Georgia PSC also approved the Renewable Energy Development Initiative (REDI) to procure an additional 1,200 MWs of renewable resources primarily utilizing market-based prices established through a competitive bidding process with expected in-service dates between 2018 and 2021. Additionally, 200 MWs of self-build capacity for use by the Company was approved, as well as consideration for no more than 200 MWs of capacity as part of a renewable commercial and industrial program.
In 2017, the Company filed for and received certification for 510 MWs of REDI utility-scale PPAs for solar generation resources, which are expected to be in operation by the end of 2019. The Company also filed for and received approval to develop several solar generation projects to fulfill the approved self-build capacity.
In the 2016 IRP, the Georgia PSC also approved recovery of costs up to $99 million through June 30, 2019 to preserve nuclear generation as an option at a future generation site in Stewart County, Georgia. On March 7, 2017, the Georgia PSC approved the Company's decision to suspend work at the site due to changing economics, including lower load forecasts and fuel costs. The timing of recovery for costs incurred of approximately $50 millionRCG petition. This matter is expected to be determined by the Georgia PSC in a future rate case.now concluded.
Fuel Cost Recovery
The CompanyGeorgia Power has established fuel cost recovery rates approved by the Georgia PSC. In 2015,During the second half of 2021, the price of natural gas rose significantly and resulted in an under recovered fuel balance exceeding $200 million. Therefore, in November 2021, the Georgia PSC voted to approve Georgia Power's interim fuel rider, which increased fuel rates by 15%, or approximately $252 million annually, effective January 1, 2022.
During 2022, Georgia Power's under recovered fuel balance continued to increase significantly due to higher fuel and purchased power costs. On May 16, 2023, the Georgia PSC approved a stipulation agreement between Georgia Power and the Company's request to lower annual billings by approximately $350 million effective January 1, 2016. In May 2016,staff of the Georgia PSC approved the Company's request to further lowerincrease annual fuel billings under an interim fuel rider by 54%, or approximately $313 million
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$1.1 billion,effective June 1, 2016, which expired on December 31, 2017.2023. The increase includes a three-year recovery period for $2.2 billion of Georgia PSC will review the Company's cumulative over orPower's under recovered fuel balance no later than September 1, 2018 and evaluateat May 31, 2023. Under the need to file a fuel case unless the Company deems it necessary to file a fuel case at an earlier time. The Company continues to beapproved stipulation agreement, Georgia Power is allowed to adjust its fuel cost recovery rates under an interim fuel rider prior to the next fuel case, subject to a maximum 40% cumulative change, if theits under or over recovered fuel balance accumulated since May 31, 2023 exceeds $200 million. Georgia Power is scheduled to file its next fuel case no later than February 28, 2026.
Georgia Power's under recovered fuel balance exceeds $200 million.totaled $1.9 billion at December 31, 2023, of which $694 million is included in under recovered fuel clause revenues and under recovered retail fuel clause revenues on Southern Company's and Georgia Power's balance sheets, respectively, and $1.2 billion is included in deferred under recovered retail fuel clause revenues on Southern Company's and Georgia Power's balance sheets. The under recovered fuel balance totaled $2.1 billion at December 31, 2022 and is included in deferred under recovered retail fuel clause revenues on Southern Company's and Georgia Power's balance sheets.
The Company'sGeorgia Power's fuel cost recovery mechanism includes costs associated with a natural gas hedging program, as revised and approved by the Georgia PSC, allowing the use of an array of derivative instruments within a 48-month36-month time horizon.
Fuel cost recovery revenues as recorded on the financial statements are adjusted for differences in actual recoverable fuel costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor will not have a significant effect on theSouthern Company's or Georgia Power's revenues or net income but will affect cash flow.
Storm Damage Recovery
The Company is accruing $30 million annually through December 31, 2019, as provided in the 2013 ARP, for incremental operating and maintenance costs of damage from major storms to its transmission and distribution facilities. Hurricanes Irma and Matthew caused significant damage to the Company's transmission and distribution facilities during September 2017 and October 2016, respectively. The incremental restoration costs related to these hurricanes deferred in the regulatory asset for storm damage totaled approximately $260 million. At December 31, 2017, the total balance in the regulatory asset related to storm damage was $333 million. The rate of storm damage cost recovery is expected to be adjusted as part of the Company's next base rate case required to be filed by July 1, 2019. As a result of this regulatory treatment, costs related to storms are not expected to have a material impact on the Company's financial statements. See Note 1 to the financial statements under "Storm Damage Recovery" for additional information regarding the Company's storm damage reserve.
Nuclear Construction
Vogtle 3 and 4 Agreement and EPC Contractor Bankruptcy
In 2008, the Company, acting for itself and as agent for the Vogtle Owners, entered into the Vogtle 3 and 4 Agreement. Under the terms of the Vogtle 3 and 4 Agreement, the Vogtle Owners agreed to pay a purchase price subject to certain price escalations and adjustments, including fixed escalation amounts and index-based adjustments, as well as adjustments for change orders, and performance bonuses for early completion and unit performance. Under the Toshiba Guarantee, Toshiba guaranteed certain payment obligations of the EPC Contractor, including any liability of the EPC Contractor for abandonment of work. In the first quarter 2016, Westinghouse delivered to the Vogtle Owners a total of $920 million of letters of credit from financial institutions (Westinghouse Letters of Credit) to secure a portion of the EPC Contractor's potential obligations under the Vogtle 3 and 4 Agreement.
Subsequent to the EPC Contractor bankruptcy filing, a number of subcontractors to the EPC Contractor alleged non-payment by the EPC Contractor for amounts owed for work performed on Plant Vogtle Units 3 and 4. The Company, acting for itself and as agent for the Vogtle Owners, has taken actions to remove liens filed by these subcontractors through the posting of surety bonds. Related to such liens, certain subcontractors have filed, and additional subcontractors may file, actions against the EPC Contractor and the Vogtle Owners to preserve their payment rights with respect to such claims. All amounts associated with the removal of subcontractor liens and other EPC Contractor pre-petition accounts payable have been paid or accrued as of December 31, 2017.
On June 9, 2017, the Company and the other Vogtle Owners and Toshiba entered into the Guarantee Settlement Agreement. Pursuant to the Guarantee Settlement Agreement, Toshiba acknowledged the amount of its obligation was $3.68 billion (Guarantee Obligations), of which the Company's proportionate share was approximately $1.7 billion. The Guarantee Settlement Agreement provided for a schedule of payments for the Guarantee Obligations beginning in October 2017 and continuing through January 2021. Toshiba made the first three payments as scheduled. On December 8, 2017, the Company, the other Vogtle Owners, certain affiliates of the Municipal Electric Authority of Georgia (MEAG Power), and Toshiba entered into Amendment No. 1 to the Guarantee Settlement Agreement (Guarantee Settlement Agreement Amendment). The Guarantee Settlement Agreement Amendment provided that Toshiba's remaining payment obligations under the Guarantee Settlement Agreement were due and payable in full on December 15, 2017, which Toshiba satisfied on December 14, 2017. Pursuant to the Guarantee Settlement Agreement Amendment, Toshiba was deemed to be the owner of certain pre-petition bankruptcy claims of the Company, the other Vogtle Owners, and certain affiliates of MEAG Power against Westinghouse, and the Company and the other Vogtle Owners surrendered the Westinghouse Letters of Credit.
Additionally, on June 9, 2017, the Company, acting for itself and as agent for the other Vogtle Owners, and the EPC Contractor entered into the Vogtle Services Agreement, which was amended and restated on July 20, 2017. On July 20, 2017, the bankruptcy court approved the EPC Contractor's motion seeking authorization to (i) enter into the Vogtle Services Agreement, (ii) assume and
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assign to the Vogtle Owners certain project-related contracts, (iii) join the Vogtle Owners as counterparties to certain assumed project-related contracts, and (iv) reject the Vogtle 3 and 4 Agreement. The Vogtle Services Agreement, and the EPC Contractor's rejection of the Vogtle 3 and 4 Agreement, became effective upon approval by the DOE on July 27, 2017. The Vogtle Services Agreement will continue until the start-up and testing of Plant Vogtle Units 3 and 4 are complete and electricity is generated and sold from both units. The Vogtle Services Agreement is terminable by the Vogtle Owners upon 30 days' written notice.
Effective October 23, 2017, the Company, acting for itself and as agent for the other Vogtle Owners, entered into a construction completion agreement with Bechtel, whereby Bechtel will serve as the primary contractor for the remaining construction activities for Plant Vogtle Units 3 and 4 (Bechtel Agreement). Facility design and engineering remains the responsibility of the EPC Contractor under the Vogtle Services Agreement. The Bechtel Agreement is a cost reimbursable plus fee arrangement, whereby Bechtel will be reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Vogtle Owner is severally (not jointly) liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The Vogtle Owners may terminate the Bechtel Agreement at any time for their convenience, provided that the Vogtle Owners will be required to pay amounts related to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs, and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Vogtle Owner suspensions of work, certain breaches of the Bechtel Agreement by the Vogtle Owners, Vogtle Owner insolvency, and certain other events. Pursuant to the Loan Guarantee Agreement between the Company and the DOE, the Company is required to obtain the DOE's approval of the Bechtel Agreement prior to obtaining any further advances under the Loan Guarantee Agreement.
On November 2, 2017, the Vogtle Owners entered into an amendment to their joint ownership agreements for Plant Vogtle Units 3 and 4 (as amended, Vogtle Joint Ownership Agreements) to provide for, among other conditions, additional Vogtle Owner approval requirements. Pursuant to the Vogtle Joint Ownership Agreements, the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 must vote to continue construction if certain adverse events occur, including (i) the bankruptcy of Toshiba; (ii) termination or rejection in bankruptcy of certain agreements, including the Vogtle Services Agreement or the Bechtel Agreement; (iii) the Georgia PSC or the Company determines that any of the Company's costs relating to the construction of Plant Vogtle Units 3 and 4 will not be recovered in retail rates because such costs are deemed unreasonable or imprudent; or (iv) an increase in the construction budget contained in the seventeenth VCM report of more than $1 billion or extension of the project schedule contained in the seventeenth VCM report of more than one year. In addition, pursuant to the Vogtle Joint Ownership Agreements, the required approval of holders of ownership interests in Plant Vogtle Units 3 and 4 is at least (i) 90% for a change of the primary construction contractor and (ii) 67% for material amendments to the Vogtle Services Agreement or agreements with Southern Nuclear or the primary construction contractor, including the Bechtel Agreement. The Vogtle Joint Ownership Agreements also confirm that the Vogtle Owners' sole recourse against the Company or Southern Nuclear for any action or inaction in connection with their performance as agent for the Vogtle Owners is limited to removal of the Company and/or Southern Nuclear as agent, except in cases of willful misconduct.
Regulatory Matters
In 2009, the Georgia PSC voted to certify construction of Plant Vogtle Units 3 and 4 with a certified capital cost of $4.418 billion. In addition, in 2009 the Georgia PSC approved inclusion of the Plant Vogtle Units 3 and 4 related CWIP accounts in rate base, and the State of Georgia enacted the Georgia Nuclear Energy Financing Act, which allows the Company to recover financing costs for nuclear construction projects certified by the Georgia PSC. Financing costs are recovered on all applicable certified costs through annual adjustments to the NCCR tariff up to the certified capital cost of $4.418 billion. As of December 31, 2017, the Company had recovered approximately $1.6 billion of financing costs. On January 30, 2018, the Company filed to decrease the NCCR tariff by approximately $50 million, effective April 1, 2018, pending Georgia PSC approval. The decrease reflects the payments received under the Guarantee Settlement Agreement, the Customer Refunds ordered by the Georgia PSC aggregating approximately $188 million, and the estimated effects of Tax Reform Legislation. The Customer Refunds were recognized as a regulatory liability as of December 31, 2017 and will be paid in three installments of $25 to each retail customer no later than the third quarter 2018.
The Company is required to file semi-annual VCM reports with the Georgia PSC by February 28 and August 31 each year. In October 2013, in connection with the eighth VCM report, the Georgia PSC approved a stipulation (2013 Stipulation) between the Company and the staff of the Georgia PSC to waive the requirement to amend the Plant Vogtle Units 3 and 4 certificate in accordance with the 2009 certification order until the completion of Plant Vogtle Unit 3, or earlier if deemed appropriate by the Georgia PSC and the Company.
On December 20, 2016, the Georgia PSC voted to approve a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with the fifteenth VCM report. On December 21, 2017, the Georgia PSC voted to approve
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(and issued its related order on January 11, 2018) certain recommendations made by the Company in the seventeenth VCM report and modifying the Vogtle Cost Settlement Agreement. The Vogtle Cost Settlement Agreement, as modified by the January 11, 2018 order, resolved the following regulatory matters related to Plant Vogtle Units 3 and 4: (i) none of the $3.3 billion of costs incurred through December 31, 2015 and reflected in the fourteenth VCM report should be disallowed from rate base on the basis of imprudence; (ii) the Contractor Settlement Agreement was reasonable and prudent and none of the amounts paid pursuant to the Contractor Settlement Agreement should be disallowed from rate base on the basis of imprudence; (iii) (a) capital costs incurred up to $5.680 billion would be presumed to be reasonable and prudent with the burden of proof on any party challenging such costs, (b) the Company would have the burden to show that any capital costs above $5.680 billion were prudent, and (c) a revised capital cost forecast of $7.3 billion (after reflecting the impact of payments received under the Guarantee Settlement Agreement and Customer Refunds) is found reasonable; (iv) construction of Plant Vogtle Units 3 and 4 should be completed, with Southern Nuclear serving as project manager and Bechtel as primary contractor; (v) approved and deemed reasonable the Company's revised schedule placing Plant Vogtle Units 3 and 4 in service in November 2021 and November 2022, respectively; (vi) confirmed that the revised cost forecast does not represent a cost cap and that prudence decisions on cost recovery will be made at a later date, consistent with applicable Georgia law; (vii) reduced the ROE used to calculate the NCCR tariff (a) from 10.95% (the ROE rate setting point authorized by the Georgia PSC in the 2013 ARP) to 10.00% effective January 1, 2016, (b) from 10.00% to 8.30%, effective January 1, 2020, and (c) from 8.30% to 5.30%, effective January 1, 2021 (provided that the ROE in no case will be less than the Company's average cost of long-term debt); (viii) reduced the ROE used for AFUDC equity for Plant Vogtle Units 3 and 4 from 10.00% to the Company's average cost of long-term debt, effective January 1, 2018; and (ix) agreed that upon Unit 3 reaching commercial operation, retail base rates would be adjusted to include carrying costs on those capital costs deemed prudent in the Vogtle Cost Settlement Agreement. The January 11, 2018 order also stated that if Plant Vogtle Units 3 and 4 are not commercially operational by June 1, 2021 and June 1, 2022, respectively, the ROE used to calculate the NCCR tariff will be further reduced by 10 basis points each month (but not lower than the Company's average cost of long-term debt) until the respective unit is commercially operational. The ROE reductions negatively impacted earnings by approximately $20 million in 2016 and $25 million in 2017 and are estimated to have negative earnings impacts of approximately $120 million in 2018 and an aggregate of $585 million from 2019 to 2022. In its January 11, 2018 order, the Georgia PSC stated if other certain conditions and assumptions upon which the Company's seventeenth VCM report are based do not materialize, both the Company and the Georgia PSC reserve the right to reconsider the decision to continue construction.
On February 12, 2018, Georgia Interfaith Power & Light, Inc. and Partnership for Southern Equity, Inc. filed a petition appealing the Georgia PSC's January 11, 2018 order with the Fulton County Superior Court. The Company believes the appeal has no merit; however, an adverse outcome in this appeal could have a material impact on the Company's results of operations, financial condition, and liquidity.
The IRS allocated PTCs to each of Plant Vogtle Units 3 and 4, which originally required the applicable unit to be placed in service before 2021. Under the Bipartisan Budget Act of 2018, Plant Vogtle Units 3 and 4 continue to qualify for PTCs. The nominal value of the Company's portion of the PTCs is approximately $500 million per unit.
In its January 11, 2018 order, the Georgia PSC also approved $542 million of capital costs incurred during the seventeenth VCM reporting period (January 1, 2017 to June 30, 2017). The Georgia PSC has approved seventeen VCM reports covering the periods through June 30, 2017, including total construction capital costs incurred through that date of $4.4 billion. The Company expects to file its eighteenth VCM report on February 28, 2018 requesting approval of approximately $450 million of construction capital costs (before payments received under the Guarantee Settlement Agreement and the Customer Refunds) incurred from July 1, 2017 through December 31, 2017. The Company's CWIP balance for Plant Vogtle Units 3 and 4 was approximately $4.8 billion as of December 31, 2017, or $3.3 billion net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.
The ultimate outcome of these matters cannot be determined at this time.
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Cost and Schedule
The Company's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4 with in service dates of November 2021 and November 2022, respectively, is as follows:
 (in billions)
Project capital cost forecast$7.3
Net investment as of December 31, 2017(3.4)
Remaining estimate to complete$3.9
Note: Excludes financing costs capitalized through AFUDC and is net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.
The Company estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
As construction continues, challenges with management of contractors, subcontractors, and vendors, labor productivity and availability, fabrication, delivery, assembly, and installation of plant systems, structures, and components (some of which are based on new technology and have not yet operated in the global nuclear industry at this scale), or other issues could arise and change the projected schedule and estimated cost.
There have been technical and procedural challenges to the construction and licensing of Plant Vogtle Units 3 and 4 at the federal and state level and additional challenges may arise. Processes are in place that are designed to assure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the NRC that occur throughout construction. As a result of such compliance processes, certain license amendment requests have been filed and approved or are pending before the NRC. Various design and other licensing-based compliance matters, including the timely resolution of Inspections, Tests, Analyses, and Acceptance Criteria and the related approvals by the NRC, may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time.
Other Matters
As of December 31, 2017, the Company had borrowed $2.6 billion related to Plant Vogtle Units 3 and 4 costs through the Loan Guarantee Agreement and a multi-advance credit facility among the Company, the DOE, and the FFB, which provides for borrowings of up to $3.46 billion, subject to the satisfaction of certain conditions. On September 28, 2017, the DOE issued a conditional commitment to the Company for up to approximately $1.67 billion in additional guaranteed loans under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extension approved by the DOE. Final approval and issuance of these additional loan guarantees by the DOE cannot be assured and are subject to the negotiation of definitive agreements, completion of due diligence by the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions. See Note 6 to the financial statements under "DOE Loan Guarantee Borrowings" for additional information, including applicable covenants, events of default, mandatory prepayment events, and conditions to borrowing.
The ultimate outcome of these matters cannot be determined at this time.
Income Tax Matters
Federal Tax Reform Legislation
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation, among other things, reduces the federal corporate income tax rate to 21%, retains normalization provisions for public utility property and existing renewable energy incentives, and repeals the corporate alternative minimum tax.
Regulated utility businesses can continue deducting all business interest expense and are not eligible for bonus depreciation on capital assets acquired and placed in service after September 27, 2017. Projects with binding contracts before September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the Protecting Americans from Tax Hikes (PATH) Act.
In addition, under the Tax Reform Legislation, net operating losses (NOLs) generated after December 31, 2017 can no longer be carried back to previous tax years but can be carried forward indefinitely, with utilization limited to 80% of taxable income of the
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subsequent tax year. The projected reduction of Southern Company's consolidated income tax liability resulting from the tax rate reduction also delays the expected utilization of existing tax credit carryforwards.
For the year ended December 31, 2017, implementation of the Tax Reform Legislation resulted in an estimated net tax benefit of $8 million, a $150 million decrease in regulatory assets, and a $3.1 billion increase in regulatory liabilities, primarily due to the impact of the reduction of the corporate income tax rate on deferred tax assets and liabilities.
The Tax Reform Legislation is subject to further interpretation and guidance from the IRS, as well as each respective state's adoption. In addition, the regulatory treatment of certain impacts of the Tax Reform Legislation is subject to the discretion of the FERC and the Georgia PSC. On January 31, 2018, SCS, on behalf of the traditional electric operating companies (including the Company), filed with the FERC a reduction to the Company's open access transmission tariff charge for 2018 to reflect the revised federal corporate tax rate. See Note 3 to the financial statements under "Regulatory Matters" for additional information regarding the Company's rate filing to reflect the impacts of the Tax Reform Legislation.
See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
The ultimate outcome of these matters cannot be determined at this time.
Bonus Depreciation
Under the Tax Reform Legislation, projects with binding contracts prior to September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the PATH Act. The PATH Act allowed for 50% bonus depreciation for 2015 through 2017, 40% bonus depreciation for 2018, and 30% bonus depreciation for 2019 and certain long-lived assets placed in service in 2020. Based on provisional estimates, bonus depreciation is expected to result in positive cash flows of approximately $270 million for the 2017 tax year and approximately $120 million for the 2018 tax year. Should Southern Company have a NOL in 2018, all of these cash flows may not be fully realized in 2018. See Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
Other Matters
The Company is involved in various other matters being litigated and regulatory matters that could affect future earnings. In addition, the Company is subject to certain claims and legal actions arising in the ordinary course of business. The Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements, such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters.
The ultimate outcome of such pending or potential litigation or regulatory matters cannot be predicted at this time; however, for current proceedings not specifically reported herein or in Note 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements. See Note 3 to the financial statements for a discussion of various other contingencies, regulatory matters, and other matters being litigated which may affect future earnings potential.
The Company regularly reviews its business to transform and modernize. Primarily in response to changing customer expectations and payment patterns, including electronic payments and alternative payment locations, and ongoing efforts to increase overall operating efficiencies, in 2017, the Company initiated the closure of its remaining payment offices and an employee attrition plan affecting approximately 300 positions. Charges associated with these activities did not have a material impact on the Company's results of operations, financial position, or cash flows. The efficiencies gained are expected to place downward pressure on operating costs in 2018.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Company prepares its financial statements in accordance with GAAP. Significant accounting policies are described in Note 1 to the financial statements. In the application of these policies, certain estimates are made that may have a material impact on the Company's results of operations and related disclosures. Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed the following critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
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Utility Regulation
The Company is subject to retail regulation by the Georgia PSC and wholesale regulation by the FERC. These regulatory agencies set the rates the Company is permitted to charge customers based on allowable costs. As a result, the Company applies accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards has a further effect on the Company's financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the Company; therefore, the accounting estimates inherent in specific costs such as depreciation, AROs, and pension and other postretirement benefits have less of a direct impact on the Company's results of operations and financial condition than they would on a non-regulated company.
As reflected in Note 1 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact the amounts of such regulatory assets and liabilities and could adversely impact the Company's financial statements.
Federal Tax Reform Legislation
Following the enactment of Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Notes 3 and 5 to the financial statements under "Retail Regulatory Matters – Rate Plans" and "Current and Deferred Income Taxes," respectively, for additional information.
Asset Retirement Obligations
AROs are computed as the fair value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities.
The liability for AROs primarily relates to the decommissioning of the Company's nuclear facilities, which include the Company's ownership interests in Plant Hatch and Plant Vogtle Units 1 and 2, and facilities that are subject to the CCR Rule, principally ash ponds. In addition, the Company has retirement obligations related to various landfill sites, underground storage tanks, and asbestos removal. The Company also has identified retirement obligations related to certain transmission and distribution facilities, including the disposal of polychlorinated biphenyls in certain transformers; leasehold improvements; equipment on customer property; and property associated with the Company's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for the retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.
The Company previously recorded AROs as a result of state requirements in Georgia which closely align with the requirements of the CCR Rule discussed above. The cost estimates are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" and "Nuclear Decommissioning" for additional information.
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Given the significant judgment involved in estimating AROs, the Company considers the liabilities for AROs to be critical accounting estimates.
Pension and Other Postretirement Benefits
The Company's calculation of pension and other postretirement benefits expense is dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term return on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the Company believes that the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect its pension and other postretirement benefits costs and obligations.
Key elements in determining the Company's pension and other postretirement benefit expense are the expected long-term return on plan assets and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. The expected long-term return on pension and other postretirement benefit plan assets is based on the Company's investment strategy, historical experience, and expectations for long-term rates of return that consider external actuarial advice. The Company determines the long-term return on plan assets by applying the long-term rate of expected returns on various asset classes to the Company's target asset allocation. For purposes of determining its liability related to the pension and other postretirement benefit plans, the Company discounts the future related cash flows using a single-point discount rate for each plan developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. For 2015 and prior years, the Company computed the interest cost component of its net periodic pension and other postretirement benefit plan expense using the same single-point discount rate. Beginning in 2016, the Company adopted a full yield curve approach for calculating the interest cost component whereby the discount rate for each year is applied to the liability for that specific year. As a result, the interest cost component of net periodic pension and other postretirement benefit plan expense decreased by approximately $35 million in 2016.
A 25 basis point change in any significant assumption (discount rate, salaries, or long-term return on plan assets) would result in an $11 million or less change in total annual benefit expense and a $172 million or less change in projected obligations.
See Note 2 to the financial statements for additional information regarding pension and other postretirement benefits.
Contingent Obligations
The Company is subject to a number of federal and state laws and regulations, as well as other factors and conditions that subject it to environmental, litigation, and other risks. See FUTURE EARNINGS POTENTIAL herein and Note 3 to the financial statements for more information regarding certain of these contingencies. The Company periodically evaluates its exposure to such risks and records reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the Company's results of operations, cash flows, or financial condition.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed separately from revenues under ASC 606. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
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Georgia Power Company 2017 Annual Report

The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to PPAs and cellular towers where the Company is the lessee and to outdoor lighting where the Company is the lessor. The Company is currently analyzing pole attachment agreements, and a lease determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
FINANCIAL CONDITION AND LIQUIDITY
Overview
The Company's financial condition remained stable at December 31, 2017. The Company's cash requirements primarily consist of funding ongoing operations, common stock dividends, capital expenditures, and debt maturities. Capital expenditures and other investing activities include investments to build new generation facilities, including Plant Vogtle Units 3 and 4, to maintain existing generation facilities, to comply with environmental regulations including adding environmental modifications to existing generating units, to expand and improve transmission and distribution facilities, and for restoration following major storms. Operating cash flows provide a substantial portion of the Company's cash needs. For the three-year period from 2018 through 2020, the Company's projected common stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows. The Company plans to finance future cash needs in excess of its operating cash flows primarily through
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

external securities issuances, equity contributions from Southern Company, borrowings from financial institutions, and borrowings through the FFB. The Company plans to use commercial paper to manage seasonal variations in operating cash flows and for other working capital needs. The Company intends to continue to monitor its access to short-term and long-term capital markets as well as bank credit arrangements to meet future capital and liquidity needs. See "Sources of Capital," "Financing Activities," and "Capital Requirements and Contractual Obligations" herein for additional information.
The Company's investments in the qualified pension plan and nuclear decommissioning trust funds increased in value as of December 31, 2017 as compared to December 31, 2016. No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated during 2018. The Company also funded approximately $5 million to its nuclear decommissioning trust funds in 2017. See "Contractual Obligations" herein and Notes 1 and 2 to the financial statements under "Nuclear Decommissioning" and "Pension Plans," respectively, for additional information.
Net cash provided from operating activities totaled $1.9 billion in 2017, a decrease of $513 million from 2016, primarily due to the timing of vendor payments and increases in under-recovered fuel costs and prepaid federal income taxes, partially offset by a decrease in voluntary contributions to the qualified pension plan. Net cash provided from operating activities totaled $2.4 billion in 2016, a decrease of $92 million from 2015, primarily due to the voluntary contribution to the qualified pension plan in 2016, partially offset by the timing of vendor payments. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Note 5 to the financial statements for additional information regarding federal income taxes.
Net cash used for investing activities totaled $0.9 billion, $2.3 billion, and $1.9 billion in 2017, 2016, and 2015, respectively, due to gross property additions primarily related to installation of equipment to comply with environmental standards; construction of generation, transmission, and distribution facilities including Plant Vogtle Units 3 and 4, partially offset in 2017 by $1.7 billion in payments received under the Guarantee Settlement Agreement; and purchases of nuclear fuel. The majority of funds needed for gross property additions for the last several years has been provided from operating activities, capital contributions from Southern Company, and the issuance of debt. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Nuclear Construction" herein for additional information on the Guarantee Settlement Agreement and construction of Plant Vogtle Units 3 and 4.
Net cash used for financing activities totaled $151 million, $142 million, and $530 million for 2017, 2016, and 2015, respectively. The increase in cash used in 2017 compared to 2016 was primarily due to a decrease in notes payable, a decrease in borrowings from the FFB for construction of Plant Vogtle Units 3 and 4, and the redemption of all outstanding shares of the Company's preferred and preference stock, partially offset by higher issuances of senior notes and junior subordinated notes and a decrease in maturities of senior notes. The decrease in cash used in 2016 compared to 2015 was primarily due to higher capital contributions from Southern Company, a decrease in redemptions and maturities of senior notes, and an increase in short-term debt, partially offset by higher common stock dividends and a decrease in borrowings from the FFB for construction of Plant Vogtle Units 3 and 4. Fluctuations in cash flow from financing activities vary from year to year based on capital needs and the maturity or redemption of securities.
Significant balance sheet changes in 2017 included an increase of $3.1 billion in deferred credits related to income taxes and a decrease of $2.8 billion in accumulated deferred income taxes primarily resulting from the impacts of Tax Reform Legislation; an increase in property, plant, and equipment of $2.0 billion to comply with environmental standards and the construction of generation, transmission, and distribution facilities, partially offset by payments received under the Guarantee Settlement Agreement of $1.7 billion, net of joint owner portion; and an increase of $1.2 billion in long-term debt primarily due to issuances of senior notes and junior subordinated notes. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Note 5 to the financial statements for additional information on Tax Reform Legislation and Note 3 to the financial statements under "Retail Regulatory Matters – Nuclear Construction" for additional information on the Guarantee Settlement Agreement.
The Company's ratio of common equity to total capitalization plus short-term debt was 49.7% at December 31, 2017 and 50.0% at December 31, 2016. See Note 6 to the financial statements for additional information.
Sources of Capital
The Company plans to obtain the funds required for construction and other purposes from sources similar to those used in the past, which were primarily from operating cash flows, external security issuances, borrowings from financial institutions, equity contributions from Southern Company, and borrowings from the FFB. However, the amount, type, and timing of any future financings, if needed, will depend upon regulatory approvals, prevailing market conditions, and other factors.
In 2014, the Company entered into the Loan Guarantee Agreement with the DOE, under which the proceeds of borrowings may be used to reimburse the Company for Eligible Project Costs incurred in connection with its construction of Plant Vogtle Units 3
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

and 4. Under the Loan Guarantee Agreement, the DOE agreed to guarantee borrowings of up to $3.46 billion (not to exceed 70% of Eligible Project Costs) to be made by the Company under a multi-advance credit facility (FFB Credit Facility) among the Company, the DOE, and the FFB. As of December 31, 2017, the Company had borrowed $2.6 billion under the FFB Credit Facility. On July 27, 2017, the Company entered into an amendment to the Loan Guarantee Agreement, which provides that further advances are conditioned upon the DOE's approval of any agreements entered into in replacement of the Vogtle 3 and 4 Agreement and satisfaction of certain other conditions.
On September 28, 2017, the DOE issued a conditional commitment to the Company for up to approximately $1.67 billion of additional guaranteed loans under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extension approved by the DOE. Final approval and issuance of these additional loan guarantees by the DOE cannot be assured and are subject to the negotiation of definitive agreements, completion of due diligence by the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions. See Note 6 to the financial statements under "DOE Loan Guarantee Borrowings" for additional information regarding the Loan Guarantee Agreement, including applicable covenants, events of default, mandatory prepayment events, and additional conditions to borrowing. Also see Note 3 to the financial statements under "Retail Regulatory Matters – Nuclear Construction" for additional information regarding Plant Vogtle Units 3 and 4.
The issuance of long-term securities by the Company is subject to the approval of the Georgia PSC. In addition, the issuance of short-term debt securities by the Company is subject to regulatory approval by the FERC. Additionally, with respect to the public offering of securities, the Company files registration statements with the SEC under the Securities Act of 1933, as amended. The amounts of securities authorized by the Georgia PSC and the FERC are continuously monitored and appropriate filings are made to ensure flexibility in the capital markets.
The Company obtains financing separately without credit support from any affiliate. See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information. The Southern Company system does not maintain a centralized cash or money pool. Therefore, funds of the Company are not commingled with funds of any other company in the Southern Company system.
At December 31, 2017, the Company's current liabilities exceeded current assets by $521 million. The Company's current liabilities frequently exceed current assets because of scheduled maturities of long-term debt and the periodic use of short-term debt as a funding source, as well as significant seasonal fluctuations in cash needs.
The Company intends to utilize operating cash flows, external security issuances, borrowings from financial institutions, equity contributions from Southern Company, and borrowings from the FFB to fund its short-term capital needs. The Company has substantial cash flow from operating activities and access to the capital markets and financial institutions to meet short-term liquidity needs.
At December 31, 2017, the Company had approximately $852 million of cash and cash equivalents. A committed credit arrangement with banks at December 31, 2017 was $1.75 billion of which $1.73 billion was unused. In May 2017, the Company amended its multi-year credit arrangement which, among other things, extended the maturity date from 2020 to 2022.
This bank credit arrangement, as well as the Company's term loan arrangements, contains a covenant that limits debt levels and contains a cross-acceleration provision to other indebtedness (including guarantee obligations) of the Company. Such cross-acceleration provision to other indebtedness would trigger an event of default if the Company defaulted on indebtedness, the payment of which was then accelerated. At December 31, 2017, the Company was in compliance with this covenant. This bank credit arrangement does not contain a material adverse change clause at the time of borrowing.
Subject to applicable market conditions, the Company expects to renew or replace this credit arrangement, as needed, prior to expiration. In connection therewith, the Company may extend the maturity date and/or increase or decrease the lending commitments thereunder.
See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
A portion of the unused credit with banks is allocated to provide liquidity support to the Company's pollution control revenue bonds and commercial paper program. The amount of variable rate pollution control revenue bonds outstanding requiring liquidity support as of December 31, 2017 was $550 million as compared to $868 million at December 31, 2016. In addition, at December 31, 2017, the Company had $469 million of pollution control revenue bonds outstanding that were required to be remarketed within the next 12 months.
The Company may also meet short-term cash needs through a Southern Company subsidiary organized to issue and sell commercial paper at the request and for the benefit of the Company and the other traditional electric operating companies. Proceeds from such issuances for the benefit of the Company are loaned directly to the Company. The obligations of each
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

traditional electric operating company under these arrangements are several and there is no cross-affiliate credit support. Short-term borrowings are included in notes payable in the balance sheets.
Details of short-term borrowings were as follows:

Short-term Debt at the End of the Period
Short-term Debt During the Period (*)

Amount Outstanding
Weighted Average Interest Rate
Average Amount Outstanding
Weighted Average Interest Rate
Maximum Amount Outstanding

(in millions)


(in millions)


(in millions)
December 31, 2017:








Commercial paper$

%
$135

1.3%
$760
Short-term bank debt150

2.2%
292

2.0%
800
Total$150

2.2%
$427

1.8%


December 31, 2016:











Commercial paper$392

1.1%
$87

0.8%
$443
December 31, 2015:











Commercial paper$158

0.6%
$234

0.3%
$678
Short-term bank debt

%
62

0.8%
250
Total$158

0.6%
$296

0.4%


(*)Average and maximum amounts are based upon daily balances during the 12-month periods ended December 31, 2017, 2016, and 2015.
The Company believes the need for working capital can be adequately met by utilizing the commercial paper program, lines of credit, short-term bank notes, and operating cash flows.
Financing Activities
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Company plans to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Senior Notes
In March 2017, the Company issued $450 million aggregate principal amount of Series 2017A 2.00% Senior Notes due March 30, 2020 and $400 million aggregate principal amount of Series 2017B 3.25% Senior Notes due March 30, 2027. The proceeds were used to repay a portion of the Company's short-term indebtedness and for general corporate purposes, including the Company's continuous construction program.
In June 2017, the Company repaid at maturity $450 million aggregate principal amount of Series 2007B 5.70% Senior Notes.
In August 2017, the Company issued $500 million aggregate principal amount of Series 2017C 2.00% Senior Notes due September 8, 2020. The proceeds were used to repay the Company's $50 million short-term floating rate bank loan due December 1, 2017 and outstanding commercial paper borrowings and for general corporate purposes.
Junior Subordinated Notes
In September 2017, the Company issued $270 million aggregate principal amount of Series 2017A 5.00% Junior Subordinated Notes due October 1, 2077. The proceeds were used to redeem all 1.8 million shares ($45 million aggregate liquidation amount) of the Company's 6.125% Series Class A Preferred Stock and 2.25 million shares ($225 million aggregate liquidation amount) of the Company's 6.50% Series 2007A Preference Stock.
Pollution Control Revenue Bonds
In April 2017, the Company purchased and held $27 million aggregate principal amount of Development Authority of Burke County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Vogtle Project), Fifth Series 1995. In October 2017, the Company remarketed these bonds to the public.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

In August 2017, the Company purchased and held $38 million aggregate principal amount of Development Authority of Bartow County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Bowen Project), First Series 1997. In October 2017, the Company remarketed these bonds to the public.
Other
In June 2017, the Company entered into three floating rate bank loans in aggregate principal amounts of $50 million, $150 million, and $100 million, with maturity dates of December 1, 2017, May 31, 2018, and June 28, 2018, respectively, bearing interest based on one-month LIBOR. Also in June 2017, the Company borrowed $500 million pursuant to a short-term uncommitted bank credit arrangement, which bears interest at a rate agreed upon by the Company and the bank from time to time and is payable on no less than 30 days' demand by the bank. The proceeds from these bank loans were used to repay a portion of the Company's existing indebtedness and for working capital and other general corporate purposes, including the Company's continuous construction program.
In August 2017, the Company repaid $250 million of the $500 million aggregate principal amount outstanding pursuant to its uncommitted bank credit arrangement. Also in August 2017, the Company amended its $100 million floating rate bank loan to extend the maturity date from June 28, 2018 to October 26, 2018.
In December 2017, the Company repaid the remaining $250 million aggregate principal amount outstanding pursuant to its uncommitted bank credit arrangement.
Subsequent to December 31, 2017, the Company repaid its outstanding $150 million and $100 million floating rate bank loans due May 31, 2018 and October 26, 2018, respectively.
Credit Rating Risk
At December 31, 2017, the Company did not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change to BBB- and/or Baa3 or below. These contracts are for physical electricity purchases and sales, fuel purchases, fuel transportation and storage, energy price risk management, transmission, interest rate management, and construction of new generation at Plant Vogtle Units 3 and 4.
The maximum potential collateral requirements under these contracts at December 31, 2017 were as follows:
Credit Ratings
Maximum
Potential
Collateral
Requirements
 (in millions)
At BBB- and/or Baa3$87
Below BBB- and/or Baa3$1,055
Included in these amounts are certain agreements that could require collateral in the event that the Company or Alabama Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Company to access capital markets and would be likely to impact the cost at which it does so.
On March 20, 2017, Moody's revised its rating outlook for the Company from stable to negative.
On March 24, 2017, S&P revised its consolidated credit rating outlook for Southern Company and its subsidiaries (including the Company) from stable to negative.
On March 30, 2017, Fitch placed the ratings of the Company on rating watch negative.
While it is unclear how the credit rating agencies, the FERC, and the Georgia PSC may respond to the Tax Reform Legislation, certain financial metrics, such as the funds from operations to debt percentage, used by the credit rating agencies to assess Southern Company and its subsidiaries, including the Company, may be negatively impacted. Absent actions by Southern Company and its subsidiaries, including the Company, to mitigate the resulting impacts, which, among other alternatives, could include adjusting capital structure and/or monetizing regulatory assets, the Company's credit ratings could be negatively affected. See Note 3 to the financial statements under "Retail Regulatory Matters – Rate Plans" for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

Market Price Risk
Due to cost-based rate regulation and other various cost recovery mechanisms, the Company continues to have limited exposure to market volatility in interest rates, commodity fuel prices, and prices of electricity. To manage the volatility attributable to these exposures, the Company nets the exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis.
To mitigate future exposure to changes in interest rates, the Company may enter into derivatives designated as hedges. The weighted average interest rate on $1.9 billion of long-term variable interest rate exposure at December 31, 2017 was 2.66%. If the Company sustained a 100 basis point change in interest rates for all long-term variable interest rate exposure, the change would affect annualized interest expense by approximately $19 million at December 31, 2017. See Note 1 to the financial statements under "Financial Instruments" and Note 11 to the financial statements for additional information.
To mitigate residual risks relative to movements in electricity prices, the Company enters into physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market and, to a lesser extent, financial hedge contracts for natural gas purchases. The Company continues to manage a fuel-hedging program implemented per the guidelines of the Georgia PSC. The Company had no material change in market risk exposure for the year ended December 31, 2017 when compared to the December 31, 2016 reporting period.
The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. For the years ended December 31, the changes in fair value of energy-related derivative contracts, the majority of which are composed of regulatory hedges, were as follows:
 
2017
Changes
 
2016
Changes
 Fair Value
 (in millions)
Contracts outstanding at the beginning of the period, assets (liabilities), net$36
 $(13)
Contracts realized or settled:   
Swaps realized or settled(13) (2)
Options realized or settled(1) 11
Current period changes(*):
   
Swaps(28) 31
Options(7) 9
Contracts outstanding at the end of the period, assets (liabilities), net$(13) $36
(*)Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
The net hedge volumes of energy-related derivative contracts for the years ended December 31 were as follows:
 2017 2016
 mmBtu Volume
 (in millions)
Commodity – Natural gas swaps146
 128
Commodity – Natural gas options17
 27
Total hedge volume163
 155
The weighted average swap contract cost above market prices was approximately $0.08 per mmBtu as of December 31, 2017. The weighted average swap contract cost below market prices was approximately $0.23 per mmBtu as of December 31, 2016. The change in option fair value is primarily attributable to the volatility of the market and the underlying change in the natural gas price. All natural gas hedge gains and losses are recovered through the Company's fuel cost recovery mechanism.
At December 31, 2017 and 2016, substantially all of the Company's energy-related derivative contracts were designated as regulatory hedges and were related to the Company's fuel-hedging program, which had a time horizon up to 48 months. Hedging
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as they are recovered through the fuel cost recovery mechanism. Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred and were not material for any year presented.
The Company uses over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. See Note 10 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts, which are all Level 2 of the fair value hierarchy, at December 31, 2017 were as follows:
 
Fair Value Measurements
December 31, 2017
 Total Maturity
 Fair Value Year 1 Years 2&3 
 (in millions)
Level 1$
 $
 $
Level 2(13) (7) (6)
Level 3
 
 
Fair value of contracts outstanding at end of period$(13) $(7) $(6)
The Company is exposed to market price risk in the event of nonperformance by counterparties to the energy-related and interest rate derivative contracts. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. Therefore, the Company does not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 11 to the financial statements.
Capital Requirements and Contractual Obligations
The construction program of the Company is currently estimated to total $3.3 billion for 2018, $3.2 billion for 2019, $2.7 billion for 2020, $2.4 billion for 2021, and $2.2 billion for 2022. These amounts include expenditures of approximately $1.2 billion, $1.0 billion, $0.9 billion, $0.7 billion, and $0.4 billion for the construction of Plant Vogtle Units 3 and 4 in 2018, 2019, 2020, 2021, and 2022, respectively. These amounts also include capital expenditures related to contractual purchase commitments for nuclear fuel and capital expenditures covered under LTSAs. Estimated capital expenditures to comply with environmental laws and regulations included in these amounts are $0.5 billion, $0.1 billion, $0.2 billion, $0.2 billion, and $0.2 billion for 2018, 2019, 2020, 2021, and 2022, respectively. These estimated expenditures do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" and "– Global Climate Issues" herein for additional information.
The Company also anticipates costs associated with closure and monitoring of ash ponds in accordance with the CCR Rule, which are reflected in the Company's ARO liabilities. These costs, which could change as the Company continues to refine its assumptions underlying the cost estimates and evaluate the method and timing of compliance activities, are estimated to be $0.2 billion per year for 2018 through 2020 and $0.3 billion per year for 2021 and 2022. See Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
The construction program is subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; changes in environmental laws and regulations; the outcome of any legal challenges to environmental rules; changes in generating plants, including unit retirements and replacements and adding or changing fuel sources at existing generating units, to meet regulatory requirements; changes in FERC rules and regulations; Georgia PSC approvals; changes in the expected environmental compliance program; changes in legislation; the cost and efficiency of construction labor, equipment, and materials; project scope and design changes; storm impacts; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures will be fully recovered. The construction program also includes Plant Vogtle Units 3 and 4, which may be subject to revised cost estimates during construction. The ability to control costs and avoid cost overruns during the development, construction, and operation of new facilities is subject to a number of factors, including, but not limited to, changes in labor costs and productivity, adverse weather conditions, shortages and inconsistent quality of equipment, materials, and labor, contractor or supplier delay, non-performance under construction, operating, or other agreements, operational readiness, including specialized operator
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

training and required site safety programs, unforeseen engineering or design problems, start-up activities (including major equipment failure and system integration), and/or operational performance. See Note 3 to the financial statements under "Retail Regulatory Matters – Nuclear Construction" for information regarding additional factors that may impact construction expenditures.
As a result of requirements by the NRC, the Company has established external trust funds for nuclear decommissioning costs. For additional information, see Note 1 to the financial statements under "Nuclear Decommissioning."
In addition, as discussed in Note 2 to the financial statements, the Company provides postretirement benefits to substantially all employees and funds trusts to the extent required by the Georgia PSC and the FERC.
Other funding requirements related to obligations associated with scheduled maturities of long-term debt, as well as the related interest, derivative obligations, leases, other purchase commitments, and trusts are detailed in the contractual obligations table that follows. See Notes 1, 2, 6, 7, and 11 to the financial statements for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

Contractual Obligations
Contractual obligations at December 31, 2017 were as follows:
 2018 2019- 2020 2021- 2022 
After
2022
 Total
 (in millions)
Long-term debt(a) —
         
Principal$850
 $1,494
 $879
 $8,693
 $11,916
Interest419
 760
 688
 5,786
 7,653
Financial derivative obligations(b)
10
 10
 
 
 20
Operating leases(c)
24
 42
 31
 44
 141
Capital leases(c)
9
 16
 
 
 25
Purchase commitments —         
Capital(d)
3,080
 5,508
 4,006
 
 12,594
Fuel(e)
1,238
 1,245
 818
 5,075
 8,376
Purchased power(f)
318
 545
 549
 2,352
 3,764
Other(g)
50
 198
 70
 297
 615
Trusts —         
Nuclear decommissioning(h)
5
 11
 11
 94
 121
Pension and other postretirement benefit plans(i)
47
 87
     134
Total$6,050
 $9,916
 $7,052
 $22,341
 $45,359
(a)All amounts are reflected based on final maturity dates except for amounts related to FFB borrowings. As it relates to the FFB borrowings, the final maturity date is February 20, 2044; however, principal amortization is reflected beginning in 2020. See Note 6 to the financial statements under "DOE Loan Guarantee Borrowings" for additional information. The Company plans to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit. Variable rate interest obligations are estimated based on rates as of December 31, 2017, as reflected in the statements of capitalization. Fixed rates include, where applicable, the effects of interest rate derivatives employed to manage interest rate risk. Long-term debt excludes capital lease amounts (shown separately).
(b)See Notes 1 and 11 to the financial statements.
(c)Excludes PPAs that are accounted for as leases and included in "Purchased power." See Note 7 to the financial statements under "Operating Leases" for additional information.
(d)The Company provides estimated capital expenditures for a five-year period, including capital expenditures associated with environmental regulations. These amounts exclude contractual purchase commitments for nuclear fuel and capital expenditures covered under LTSAs which are reflected in "Fuel" and "Other," respectively. At December 31, 2017, significant purchase commitments were outstanding in connection with the construction program. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" and "Retail Regulatory Matters – Nuclear Construction" herein for additional information.
(e)Includes commitments to purchase coal, nuclear fuel, and natural gas, as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery. Amounts reflected for natural gas purchase commitments have been estimated based on the New York Mercantile Exchange future prices at December 31, 2017.
(f)Estimated minimum long-term obligations for various PPA purchases from gas-fired, biomass, and wind-powered facilities.
(g)Includes LTSAs and contracts for the procurement of limestone. LTSAs include price escalation based on inflation indices.
(h)
Projections of nuclear decommissioning trust fund contributions for Plant Hatch and Plant Vogtle Units 1 and 2 are based on the 2013 ARP. See Note 1 to the financial statements under "Nuclear Decommissioning" for additional information.
(i)The Company forecasts contributions to the pension and other postretirement benefit plans over a three-year period. The Company anticipates no mandatory contributions to the qualified pension plan during the next three years. Amounts presented represent estimated benefit payments for the nonqualified pension plans, estimated non-trust benefit payments for the other postretirement benefit plans, and estimated contributions to the other postretirement benefit plan trusts, all of which will be made from the Company's corporate assets. See Note 2 to the financial statements for additional information related to the pension and other postretirement benefit plans, including estimated benefit payments. Certain benefit payments will be made through the related benefit plans. Other benefit payments will be made from the Company's corporate assets.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

Cautionary Statement Regarding Forward-Looking Statements
The Company's 2017 Annual Report contains forward-looking statements. Forward-looking statements include, among other things, statements concerning regulated rates, customer and sales growth, economic conditions, fuel and environmental cost recovery and other rate actions, current and proposed environmental regulations and related compliance plans and estimated expenditures, pending or potential litigation matters, access to sources of capital, projections for the qualified pension plan, postretirement benefit plans, and nuclear decommissioning trust fund contributions, financing activities, completion dates of construction projects, filings with state and federal regulatory authorities, impacts of the Tax Reform Legislation, federal income tax benefits, estimated sales and purchases under power sale and purchase agreements, and estimated construction and other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:
the impact of recent and future federal and state regulatory changes, including environmental laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which the Company is subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulations and IRS interpretations, actions that may be taken in response by regulatory authorities, and its impact, if any, on the credit ratings of the Company;
current and future litigation or regulatory investigations, proceedings, or inquiries;
the effects, extent, and timing of the entry of additional competition in the markets in which the Company operates;
variations in demand for electricity, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures, including from the development and deployment of alternative energy sources such as self-generation and distributed generation technologies, and any potential economic impacts resulting from federal fiscal decisions;
available sources and costs of fuels;
effects of inflation;
the ability to control costs and avoid cost overruns during the development, construction, and operation of facilities, which include the development and construction of generating facilities with designs that have not been previously constructed, including changes in labor costs and productivity, adverse weather conditions, shortages and inconsistent quality of equipment, materials, and labor, contractor or supplier delay, non-performance under construction, operating, or other agreements, operational readiness, including specialized operator training and required site safety programs, unforeseen engineering or design problems, start-up activities (including major equipment failure and system integration), and/or operational performance;
the ability to construct facilities in accordance with the requirements of permits and licenses (including satisfaction of NRC requirements), to satisfy any environmental performance standards and the requirements of tax credits and other incentives, and to integrate facilities into the Southern Company system upon completion of construction;
investment performance of the Company's employee and retiree benefit plans and nuclear decommissioning trust funds;
advances in technology;
state and federal rate regulations and the impact of pending and future rate cases and negotiations, including rate cases related to fuel and other cost recovery mechanisms;
the ability to successfully operate generating, transmission, and distribution facilities and the successful performance of necessary corporate functions;
legal proceedings and regulatory approvals and actions related to Plant Vogtle Units 3 and 4, including Georgia PSC approvals and NRC actions;
the inherent risks involved in operating and constructing nuclear generating facilities, including environmental, health, regulatory, natural disaster, terrorism, and financial risks;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, which cannot be assured to be completed or beneficial to the Company;
the ability of counterparties of the Company to make payments as and when due and to perform as required;
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Georgia Power Company 2017 Annual Report

the ability to obtain new short- and long-term contracts with wholesale customers;
the direct or indirect effect on the Company's business resulting from cyber intrusion or physical attack and the threat of physical attacks;
interest rate fluctuations and financial market conditions and the results of financing efforts;
changes in the Company's credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general, as well as potential impacts on the benefits of the DOE loan guarantees;
the ability of the Company to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;
catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events such as influenzas, or other similar occurrences;
the direct or indirect effects on the Company's business resulting from incidents affecting the U.S. electric grid or operation of generating resources;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by the Company from time to time with the SEC.
The Company expressly disclaims any obligation to update any forward-looking statements.
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STATEMENTS OF INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Georgia Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Revenues:     
Retail revenues$7,738
 $7,772
 $7,727
Wholesale revenues, non-affiliates163
 175
 215
Wholesale revenues, affiliates26
 42
 20
Other revenues383
 394
 364
Total operating revenues8,310
 8,383
 8,326
Operating Expenses:     
Fuel1,671
 1,807
 2,033
Purchased power, non-affiliates416
 361
 289
Purchased power, affiliates622
 518
 575
Other operations and maintenance1,653
 1,960
 1,844
Depreciation and amortization895
 855
 846
Taxes other than income taxes409
 405
 391
Total operating expenses5,666
 5,906
 5,978
Operating Income2,644
 2,477
 2,348
Other Income and (Expense):     
Interest expense, net of amounts capitalized(419) (388) (363)
Other income (expense), net33
 38
 61
Total other income and (expense)(386) (350) (302)
Earnings Before Income Taxes2,258
 2,127
 2,046
Income taxes830
 780
 769
Net Income1,428
 1,347
 1,277
Dividends on Preferred and Preference Stock14
 17
 17
Net Income After Dividends on Preferred and Preference Stock$1,414
 $1,330
 $1,260
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Georgia Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Net Income$1,428
 $1,347
 $1,277
Other comprehensive income (loss):     
Qualifying hedges:     
Changes in fair value, net of tax of $-, $-, and $(6),
respectively

 
 (9)
Reclassification adjustment for amounts included in net income,
net of tax of $1, $2, and $1, respectively
3
 2
 2
Total other comprehensive income (loss)3
 2
 (7)
Comprehensive Income$1,431
 $1,349
 $1,270
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2017, 2016, and 2015
Georgia Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Activities:     
Net income$1,428
 $1,347
 $1,277
Adjustments to reconcile net income
to net cash provided from operating activities —
     
Depreciation and amortization, total1,100
 1,063
 1,029
Deferred income taxes458
 383
 173
Retail fuel cost over recovery — long-term
 
 106
Pension, postretirement, and other employee benefits(68) (33) 40
Pension and postretirement funding
 (287) (7)
Settlement of asset retirement obligations(120) (123) (29)
Other deferred charges — affiliated
 (111) 
Other, net(83) (25) (70)
Changes in certain current assets and liabilities —     
-Receivables(256) 60
 187
-Fossil fuel stock(16) 104
 37
-Prepaid income taxes(168) 
 89
-Other current assets(28) (38) (62)
-Accounts payable(219) (42) (259)
-Accrued taxes1
 131
 25
-Retail fuel cost over recovery(84) (32) 10
-Other current liabilities(33) 28
 (29)
Net cash provided from operating activities1,912
 2,425
 2,517
Investing Activities:     
Property additions(2,704) (2,223) (2,091)
Proceeds pursuant to the Toshiba Guarantee, net of joint owner portion
              
1,682
 
 
Nuclear decommissioning trust fund purchases(574) (808) (985)
Nuclear decommissioning trust fund sales568
 803
 980
Cost of removal, net of salvage(100) (83) (71)
Change in construction payables, net of joint owner portion223
 (35) 217
Payments pursuant to LTSAs(64) (34) (66)
Sale of property96
 10
 70
Other investing activities(39) 23
 2
Net cash used for investing activities(912) (2,347) (1,944)
Financing Activities:     
Increase (decrease) in notes payable, net(391) 234
 2
Proceeds —     
Senior notes1,350
 650
 500
FFB loan
 425
 1,000
Pollution control revenue bonds issuances and remarketings65
 
 409
Capital contributions from parent company431
 594
 62
Short-term borrowings700
 
 250
Other long-term debt370
 
 
Redemptions and repurchases —     
Senior notes(450) (700) (1,175)
Preferred and preference stock(270) 
 
Pollution control revenue bonds(65) (4) (268)
Short-term borrowings(550) 
 (250)
Payment of common stock dividends(1,281) (1,305) (1,034)
Other financing activities(60) (36) (26)
Net cash used for financing activities(151) (142) (530)
Net Change in Cash and Cash Equivalents849
 (64) 43
Cash and Cash Equivalents at Beginning of Year3
 67
 24
Cash and Cash Equivalents at End of Year$852
 $3
 $67
Supplemental Cash Flow Information:     
Cash paid during the period for —     
Interest (net of $23, $20, and $16 capitalized, respectively)$386
 $375
 $353
Income taxes (net of refunds)496
 170
 506
Noncash transactions —     
Accrued property additions at year-end550
 336
 387
Capital lease obligation
 
 149
The accompanying notes are an integral part of these financial statements.
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BALANCE SHEETS
At December 31, 2017 and 2016
Georgia Power Company 2017 Annual Report
Assets2017
 2016
 (in millions)
Current Assets:   
Cash and cash equivalents$852
 $3
Receivables —   
Customer accounts receivable708
 523
Unbilled revenues255
 224
Joint owner accounts receivable262
 57
Affiliated24
 18
Other accounts and notes receivable76
 81
Accumulated provision for uncollectible accounts(3) (3)
Fossil fuel stock314
 298
Materials and supplies504
 479
Prepaid expenses216
 105
Other regulatory assets, current205
 193
Other current assets15
 38
Total current assets3,428
 2,016
Property, Plant, and Equipment:   
In service34,861
 33,841
Less: Accumulated provision for depreciation11,704
 11,317
Plant in service, net of depreciation23,157
 22,524
Nuclear fuel, at amortized cost544
 569
Construction work in progress4,613
 4,939
Total property, plant, and equipment28,314
 28,032
Other Property and Investments:   
Equity investments in unconsolidated subsidiaries53
 60
Nuclear decommissioning trusts, at fair value929
 814
Miscellaneous property and investments59
 46
Total other property and investments1,041
 920
Deferred Charges and Other Assets:   
Deferred charges related to income taxes516
 676
Other regulatory assets, deferred2,932
 2,774
Other deferred charges and assets548
 417
Total deferred charges and other assets3,996
 3,867
Total Assets$36,779
 $34,835
The accompanying notes are an integral part of these financial statements.

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BALANCE SHEETS
At December 31, 2017 and 2016
Georgia Power Company 2017 Annual Report
Liabilities and Stockholder's Equity2017
 2016
 (in millions)
Current Liabilities:   
Securities due within one year$857
 $460
Notes payable150
 391
Accounts payable —   
Affiliated493
 438
Other834
 589
Customer deposits270
 265
Accrued taxes —   
Accrued income taxes
 17
Other accrued taxes344
 390
Accrued interest123
 106
Accrued compensation219
 224
Asset retirement obligations, current270
 299
Other regulatory liabilities, current191
 31
Over recovered fuel clause revenues, current
 84
Other current liabilities198
 182
Total current liabilities3,949
 3,476
Long-Term Debt (See accompanying statements)
11,073
 10,225
Deferred Credits and Other Liabilities:   
Accumulated deferred income taxes3,175
 6,000
Deferred credits related to income taxes3,248
 121
Accumulated deferred ITCs248
 256
Employee benefit obligations659
 703
Asset retirement obligations, deferred2,368
 2,233
Other deferred credits and liabilities128
 199
Total deferred credits and other liabilities9,826
 9,512
Total Liabilities24,848
 23,213
Preferred Stock (See accompanying statements)

 45
Preference Stock (See accompanying statements)

 221
Common Stockholder's Equity (See accompanying statements)
11,931
 11,356
Total Liabilities and Stockholder's Equity$36,779
 $34,835
Commitments and Contingent Matters (See notes)

 
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF CAPITALIZATION
At December 31, 2017 and 2016
Georgia Power Company 2017 Annual Report
 2017
 2016
 2017
 2016
 (in millions) (percent of total)
Long-Term Debt:       
Long-term notes payable —       
5.70% due 2017$
 $450
    
1.95% to 5.40% due 2018747
 748
    
4.25% due 2019499
 500
    
2.00% due 2020950
 
    
2.40% due 2021325
 325
    
2.85% due 2022400
 400
    
3.25% to 5.95% due 2023-20434,175
 3,775
    
Variable rate (2.29% at 12/31/17) due 2018100
 
    
Total long-term notes payable7,196
 6,198
    
Other long-term debt —       
Pollution control revenue bonds —       
2.35% due 202253
 53
    
1.38% to 4.00% due 2025-2049940
 900
    
Variable rate (1.84% at 12/31/17) due 202213
 13
    
Variable rates (1.59% to 1.88% at 12/31/17) due 2026-2053815
 854
    
FFB loans —       
2.57% to 3.86% due 202044
 44
    
2.57% to 3.86% due 202144
 44
    
2.57% to 3.86% due 202244
 44
    
2.57% to 3.86% due 2023-20442,493
 2,493
    
Junior subordinated note (5.00%) due 2077270
 
    
Total other long-term debt4,716
 4,445
    
Capitalized lease obligations154
 169
    
Unamortized debt premium (discount), net(12) (10)    
Unamortized debt issuance expense(124) (117)    
Total long-term debt (annual interest requirement — $437 million)11,930
 10,685
    
Less amount due within one year857
 460
    
Long-term debt excluding amount due within one year11,073
 10,225
 48.1% 46.8%
Preferred and Preference Stock:       
Non-cumulative preferred stock       
$25 par value — 6.125%       
Authorized — 50,000,000 shares       
Outstanding — 2017: no shares       
                     — 2016: 1,800,000 shares
 45
    
Non-cumulative preference stock       
$100 par value — 6.50%       
Authorized — 15,000,000 shares       
Outstanding — 2017: no shares       
                     — 2016: 2,250,000 shares
 221
    
Total preferred and preference stock
 266
 
 1.2
Common Stockholder's Equity:       
Common stock, without par value —       
Authorized — 20,000,000 shares       
Outstanding — 9,261,500 shares398
 398
    
Paid-in capital7,328
 6,885
    
Retained earnings4,215
 4,086
    
Accumulated other comprehensive loss(10) (13)    
Total common stockholder's equity11,931
 11,356
 51.9
 52.0
Total Capitalization$23,004
 $21,847
 100.0% 100.0%
The accompanying notes are an integral part of these financial statements.
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STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2017, 2016, and 2015
Georgia Power Company 2017 Annual Report
 Number of Common Shares Issued Common Stock Paid-In Capital Retained Earnings Accumulated Other Comprehensive Income (Loss) Total
 (in millions)
Balance at December 31, 20149
 $398
 $6,196
 $3,835
 $(8) $10,421
Net income after dividends on preferred
and preference stock

 
 
 1,260
 
 1,260
Capital contributions from parent company
 
 79
 
 
 79
Other comprehensive income (loss)
 
 
 
 (7) (7)
Cash dividends on common stock
 
 
 (1,034) 
 (1,034)
Balance at December 31, 20159
 398
 6,275
 4,061
 (15) 10,719
Net income after dividends on preferred
and preference stock

 
 
 1,330
 
 1,330
Capital contributions from parent company
 
 610
 
 
 610
Other comprehensive income (loss)
 
 
 
 2
 2
Cash dividends on common stock
 
 
 (1,305) 
 (1,305)
Balance at December 31, 20169
 398
 6,885
 4,086
 (13) 11,356
Net income after dividends on preferred
and preference stock

 
 
 1,414
 
 1,414
Capital contributions from parent company
 
 443
 
 
 443
Other comprehensive income (loss)
 
 
 
 3
 3
Cash dividends on common stock
 
 
 (1,281) 
 (1,281)
Other
 
 
 (4) 
 (4)
Balance at December 31, 20179
 $398
 $7,328
 $4,215
 $(10) $11,931
The accompanying notes are an integral part of these financial statements.
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NOTES TO FINANCIAL STATEMENTS
Georgia Power Company 2017 Annual Report




Index to the Notes to Financial Statements

NotePage
1
2
3
4
5
6
7
8
9
10
11
12

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NOTES (continued)
Georgia Power Company 2017 Annual Report

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
Georgia Power Company (the Company) is a wholly-owned subsidiary of Southern Company, which is the parent company of the Company and three other traditional electric operating companies, as well as Southern Power, Southern Company Gas (as of July 1, 2016), SCS, Southern Linc, Southern Company Holdings, Inc. (Southern Holdings), Southern Nuclear, PowerSecure, Inc. (PowerSecure) (as of May 9, 2016), and other direct and indirect subsidiaries. The traditional electric operating companies – the Company, Alabama Power, Gulf Power, and Mississippi Power – are vertically integrated utilities providing electric service in four Southeastern states. The Company provides electric service to retail customers within its traditional service territory located within the State of Georgia and to wholesale customers in the Southeast. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through utilities in seven states and is involved in several other complementary businesses including gas marketing services, wholesale gas services, and gas midstream operations. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary, primarily for Southern Company's investments in leveraged leases and for other electric services. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants, including the Company's Plant Hatch and Plant Vogtle Units 1 and 2, and is managing construction of Plant Vogtle Units 3 and 4. PowerSecure is a provider of products and services in the areas of distributed generation, energy efficiency, and utility infrastructure.
The equity method is used for subsidiaries in which the Company has significant influence but does not control.
The Company is subject to regulation by the FERC and the Georgia PSC. As such, the Company's financial statements reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by its regulatory commissions. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation.
In 2015, the Company identified an error affecting the billing to a small number of large commercial and industrial customers under a rate plan allowing for variable demand-driven pricing from January 1, 2013 to June 30, 2015. In the second quarter 2015, the Company recorded an out of period adjustment of approximately $75 million to decrease retail revenues, resulting in a decrease to net income of approximately $47 million. The Company evaluated the effects of this error on the interim and annual periods that included the billing error. Based on an analysis of qualitative and quantitative factors, the Company determined the error was not material to any affected period and, therefore, an amendment of previously filed financial statements was not required.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed separately from revenues under ASC 606. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under
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NOTES (continued)
Georgia Power Company 2017 Annual Report

the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to PPAs and cellular towers where the Company is the lessee and to outdoor lighting where the Company is the lessor. The Company is currently analyzing pole attachment agreements, and a lease determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). ASU 2016-09 changes the accounting for income taxes and the cash flow presentation for share-based payment award transactions effective for fiscal years beginning after December 15, 2016. The new guidance requires all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation to be recognized as income tax expense or benefit in the income statement. Previously, the Company recognized any excess tax benefits and deficiencies related to the exercise and vesting of stock compensation as additional paid-in capital. In addition, the new guidance requires excess tax benefits for share-based payments to be included in net cash provided from operating activities rather than net cash provided from financing activities on the statement of cash flows. The Company elected to adopt the guidance in 2016 and reflect the related adjustments as of January 1, 2016. Prior year's data presented in the financial statements has not been adjusted. The Company also elected to recognize forfeitures as they occur. The new guidance did not have a material impact on the results of operations, financial position, or cash flows of the Company. See Notes 5 and 8 for disclosures impacted by ASU 2016-09.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
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Affiliate Transactions
The Company has an agreement with SCS under which the following services are rendered to the Company at direct or allocated cost: general and design engineering, operations, purchasing, accounting, finance and treasury, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, and other services with respect to business and operations, construction management, and power pool transactions. Costs for these services amounted to $625 million, $606 million, and $585 million in 2017, 2016, and 2015, respectively. Cost allocation methodologies used by SCS prior to the repeal of the Public Utility Holding Company Act of 1935, as amended, were approved by the SEC. Subsequently, additional cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies. See Note 7 under "Operating Leases" for information on leases of cellular tower space for the Company's digital wireless communications equipment.
The Company has an agreement with Southern Nuclear under which the following nuclear-related services are rendered to the Company at cost: general executive and advisory services; general operations, management, and technical services; administrative services including procurement, accounting, employee relations, systems, and procedures services; strategic planning and budgeting services; and other services with respect to business, operations, and construction management. Costs for these services amounted to $675 million, $666 million, and $681 million in 2017, 2016, and 2015, respectively. See Note 3 under "Retail Regulatory Matters – Nuclear Construction" for additional information.
The Company has entered into several PPAs with Southern Power for capacity and energy. Expenses associated with these PPAs were $235 million, $265 million, and $179 million in 2017, 2016, and 2015, respectively. See Note 6 under "Capital Leases" and Note 7 under "Fuel and Purchased Power Agreements" for additional information.
The Company has a joint ownership agreement with Gulf Power under which Gulf Power owns a 25% portion of Plant Scherer Unit 3. Under this agreement, the Company operates Plant Scherer Unit 3 and Gulf Power reimburses the Company for its 25% proportionate share of the related non-fuel expenses, which were $11 million, $8 million, and $12 million in 2017, 2016, and 2015, respectively. See Note 4 for additional information.
In 2014, prior to Southern Company's acquisition of PowerSecure on May 9, 2016, the Company entered into agreements with PowerSecure to build solar power generation facilities at two U.S. Army bases, as approved by the Georgia PSC. In October 2016, the two facilities began commercial operation. Payments of $119 million made by the Company to PowerSecure under the agreements since 2014 are included in utility plant in service at December 31, 2017.
On September 1, 2016, Southern Company Gas acquired a 50% equity interest in Southern Natural Gas Company, L.L.C. (SNG). Prior to completion of the acquisition, SCS, as agent for the Company, had entered into a long-term interstate natural gas transportation agreement with SNG. The interstate transportation service provided to the Company by SNG pursuant to this agreement is governed by the terms and conditions of SNG's natural gas tariff and is subject to FERC regulation. Transportation costs under this agreement were $102 million in 2017 and $35 million for the period subsequent to Southern Company Gas' investment in SNG through December 31, 2016.
Prior to Southern Company's acquisition of Southern Company Gas, SCS, as agent for the Company, had agreements with certain subsidiaries of Southern Company Gas to purchase natural gas. Natural gas purchases made by the Company from Southern Company Gas' subsidiaries were $22 million in 2017 and $10 million for the period subsequent to Southern Company's acquisition of Southern Company Gas through December 31, 2016.
The Company provides incidental services to and receives such services from other Southern Company subsidiaries which are generally minor in duration and amount. Except as described herein, the Company neither provided nor received any material services to or from affiliates in 2017, 2016, or 2015.
The traditional electric operating companies, including the Company, and Southern Power may jointly enter into various types of wholesale energy, natural gas, and certain other contracts, either directly or through SCS as agent. Each participating company may be jointly and severally liable for the obligations incurred under these agreements. See Note 7 under "Fuel and Purchased Power Agreements" for additional information.
Regulatory Assets and Liabilities
The Company is subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process.
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Regulatory assets and (liabilities) reflected in the balance sheets at December 31 relate to:
 2017 2016 Note
 (in millions)  
Retiree benefit plans$1,313
 $1,348
 (a, k)
Asset retirement obligations945
 893
 (b, k)
Deferred income tax charges521
 681
 (b, c, k)
Storm damage reserves333
 206
 (d)
Remaining net book value of retired assets146
 166
 (e)
Loss on reacquired debt127
 137
 (f, k)
Other regulatory assets119
 97
 (g)
Vacation pay91
 91
 (h, k)
Other cost of removal obligations40
 3
 (b)
Cancelled construction projects36
 44
 (i)
Deferred income tax credits(3,248) (121) (b, c)
Other regulatory liabilities(191) (39) (j, k)
Total regulatory assets (liabilities), net$232
 $3,506
  
Note: The recovery and amortization periods for these regulatory assets and (liabilities) are as follows:
(a)Recovered and amortized over the average remaining service period which may range up to 14 years. See Note 2 for additional information.
(b)Asset retirement and other cost of removal obligations and deferred income tax assets are recovered and deferred income tax liabilities are amortized over the related property lives, which may range up to 65 years. Asset retirement and removal liabilities will be settled and trued up following completion of the related activities. Included in the deferred income tax assets is $21 million for the retiree Medicare drug subsidy, which is recovered and amortized, as approved by the Georgia PSC, through 2022.
(c)As a result of Tax Reform Legislation, these balances include $145 million of deferred income tax assets related to CWIP for Plant Vogtle Units 3 and 4 and $626 million of deferred income tax liabilities, neither of which are subject to normalization. The recovery and amortization of these amounts will be determined by the Georgia PSC. See Note 3 under "Retail Regulatory Matters – Rate Plans" and Note 5 for additional information.
(d)Previous under-recovery as of December 2013 is recorded and recovered or amortized as approved by the Georgia PSC through 2019. Amortization of $319 million related to the under-recovery from January 2014 through December 2017 is expected to be determined by the Georgia PSC in the 2019 base rate case. See Note 3 under "Retail Regulatory Matters – Storm Damage Recovery" for additional information.
(e)Amortized as approved by the Georgia PSC over periods not exceeding 10 years or through 2024. The net book value of Plant Mitchell Unit 3 at December 31, 2017 was $10 million, which will continue to be amortized through December 31, 2019 as provided in the 2013 ARP. Amortization of the remaining net book value of Plant Mitchell Unit 3 at December 31, 2019, which is expected to be approximately $4 million, and $31 million related to obsolete inventories of certain retired units is expected to be determined by the Georgia PSC in the 2019 base rate case. See Note 3 under "Retail Regulatory Matters – Integrated Resource Plan" for additional information.
(f)Recovered over either the remaining life of the original issue or, if refinanced, over the remaining life of the new issue, which currently does not exceed 35 years.
(g)Comprised of several components including deferred nuclear outages, environmental remediation, building lease, demand-side management tariff under-recovery, and fuel-hedging losses. Deferred nuclear outages are recorded and recovered or amortized over the outage cycles of each nuclear unit, which does not exceed 24 months. The building lease is recorded and recovered or amortized as approved by the Georgia PSC through 2020. The amortization of environmental remediation and demand-side management tariff under-recovery of $54 million at December 31, 2017 is expected to be determined by the Georgia PSC in the 2019 base rate case. Fuel-hedging losses are recovered through the Company's fuel cost recovery mechanism upon final settlement.
(h)Recorded as earned by employees and recovered as paid, generally within one year. This includes both vacation and banked holiday pay.
(i)Costs associated with construction of environmental controls that will not be completed as a result of unit retirements are being amortized as approved by the Georgia PSC over periods not exceeding nine years or through 2022.
(j)Comprised of certain customer refunds and fuel-hedging gains. As ordered by the Georgia PSC on January 11, 2018, approximately $188 million of the proceeds pursuant to the Toshiba Guarantee will be refunded to customers in 2018. Fuel-hedging gains are refunded through the Company's fuel cost recovery mechanism upon final settlement. See Note 3 under "Nuclear Construction" for additional information on the customer refunds related to the Toshiba Guarantee.
(k)Generally not earning a return as they are excluded from rate base or are offset in rate base by a corresponding asset or liability.
In the event that a portion of the Company's operations is no longer subject to applicable accounting rules for rate regulation, the Company would be required to write off to income or reclassify to accumulated OCI related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the Company would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 3 under "Retail Regulatory Matters" for additional information.
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Revenues
Wholesale capacity revenues from PPAs are recognized either on a levelized basis over the appropriate contract period or the amount billable under the contract terms. Energy and other revenues are recognized as services are provided. Unbilled revenues related to retail sales are accrued at the end of each fiscal period. Electric rates for the Company include provisions to adjust billings for fluctuations in fuel costs, the energy component of purchased power costs, and certain other costs. Revenues are adjusted for differences between the actual recoverable costs and amounts billed in current regulated rates.
The Company has a diversified base of customers. No single customer or industry comprises 10% or more of revenues. For all periods presented, uncollectible accounts averaged less than 1% of revenues.
Fuel Costs
Fuel costs are expensed as the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. Fuel expense also includes the amortization of the cost of nuclear fuel.
Income and Other Taxes
The Company uses the liability method of accounting for deferred income taxes and provides deferred income taxes for all significant income tax temporary differences. Taxes that are collected from customers on behalf of governmental agencies to be remitted to these agencies are presented net on the statements of income.
Federal ITCs utilized are deferred and, upon utilization, amortized to income as a credit to reduce depreciation over the average life of the related property. The Company had $87 million in federal ITCs at December 31, 2017 that will expire by 2037. State ITCs are recognized in the period in which the credits are generated. The Company had state investment and other tax credit carryforwards totaling $495 million at December 31, 2017, which will expire between 2019 and 2028 and are expected to be fully utilized by 2026.
The Company recognizes tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 5 under "Unrecognized Tax Benefits" for additional information.
Property, Plant, and Equipment
Property, plant, and equipment is stated at original cost less any regulatory disallowances and impairments. Original cost includes: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the cost of equity and debt funds used during construction.
The Company's property, plant, and equipment in service consisted of the following at December 31:
 2017 2016
 (in millions)
Generation$17,038
 $16,668
Transmission5,947
 5,779
Distribution9,978
 9,553
General1,870
 1,813
Plant acquisition adjustment28
 28
Total plant in service$34,861
 $33,841
The cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed with the exception of certain generating plant maintenance costs. As mandated by the Georgia PSC, the Company defers and amortizes nuclear refueling outage costs over the unit's operating cycle. The refueling cycles are 18 and 24 months for Plant Vogtle Units 1 and 2 and Plant Hatch Units 1 and 2, respectively.
Depreciation and Amortization
Depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates, which approximated 2.7% in 2017, 2.8% in 2016, and 2.7% in 2015. Depreciation studies are conducted periodically to update the composite rates that are approved by the Georgia PSC and the FERC. When property subject to depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from
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the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the plant are retired when the related property unit is retired.
Under the terms of the 2013 ARP, the Company amortized approximately $14 million annually from 2014 through 2016 of its remaining regulatory liability related to other cost of removal obligations.
Asset Retirement Obligations and Other Costs of Removal
AROs are computed as the present value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. The Company has received accounting guidance from the Georgia PSC allowing the continued accrual and recovery of other retirement costs for long-lived assets that the Company does not have a legal obligation to retire. Accordingly, amounts to be recovered are reflected in the balance sheets as a regulatory asset and any accumulated removal costs for future obligations are reflected in the balance sheets as a regulatory liability.
The ARO liability primarily relates to the Company's ash ponds, landfills, and gypsum cells that are subject to the Disposal of Coal Combustion Residuals from Electric Utilities final rule published by the EPA in 2015 (CCR Rule). In addition, the Company has retirement obligations related to decommissioning of the Company's nuclear facilities, which include the Company's ownership interests in Plant Hatch and Plant Vogtle Units 1 and 2, underground storage tanks, and asbestos removal. The Company also has identified retirement obligations related to certain transmission and distribution facilities, including the disposal of polychlorinated biphenyls in certain transformers; leasehold improvements; equipment on customer property; and property associated with the Company's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for the retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO. The Company will continue to recognize in the statements of income allowed removal costs in accordance with its regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability in the balance sheets as ordered by the Georgia PSC. See "Nuclear Decommissioning" herein for additional information on amounts included in rates.
Details of the AROs included in the balance sheets are as follows:
 2017 2016
 (in millions)
Balance at beginning of year$2,532
 $1,916
Liabilities incurred4
 
Liabilities settled(120) (123)
Accretion89
 77
Cash flow revisions133
 662
Balance at end of year$2,638
 $2,532
In 2017 and 2016, the increases in cash flow revisions are primarily related to changes to the Company's closure strategy for ash ponds, landfills, and gypsum cells and the increases in liabilities settled are primarily related to ash pond closure activity.
The cost estimates for AROs related to the CCR Rule are based on information as of December 31, 2017 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary.
Nuclear Decommissioning
The NRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. The Company has external trust funds (Funds) to comply with the NRC's regulations. Use of the Funds is restricted to nuclear decommissioning activities. The Funds are managed and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and the Georgia PSC, as well as the IRS. While the Company is allowed to prescribe an overall investment policy to the Funds' managers, the Company and its affiliates are not
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allowed to engage in the day-to-day management of the Funds or to mandate individual investment decisions. Day-to-day management of the investments in the Funds is delegated to unrelated third party managers with oversight by the management of the Company. The Funds' managers are authorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the return on the Funds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities.
The Company records the investment securities held in the Funds at fair value, as disclosed in Note 10, as management believes that fair value best represents the nature of the Funds. Gains and losses, whether realized or unrealized, are recorded in the regulatory liability for AROs in the balance sheets and are not included in net income or OCI. Fair value adjustments and realized gains and losses are determined on a specific identification basis.
The Funds participate in a securities lending program through the managers of the Funds. Under this program, the Funds' investment securities are loaned to institutional investors for a fee. Securities loaned are fully collateralized by cash, letters of credit, and/or securities issued or guaranteed by the U.S. government or its agencies or instrumentalities. As of December 31, 2017 and 2016, approximately $76 million and $56 million, respectively, of the fair market value of the Funds' securities were on loan and pledged to creditors under the Funds' managers' securities lending program. The fair value of the collateral received was approximately $77 million and $58 million at December 31, 2017 and 2016, respectively, and can only be sold by the borrower upon the return of the loaned securities. The collateral received is treated as a non-cash item in the statements of cash flows.
At December 31, 2017, investment securities in the Funds totaled $929 million, consisting of equity securities of $415 million, debt securities of $502 million, and $12 million of other securities. At December 31, 2016, investment securities in the Funds totaled $814 million, consisting of equity securities of $326 million, debt securities of $477 million, and $11 million of other securities. These amounts include the investment securities pledged to creditors and collateral received, and exclude receivables related to investment income and pending investment sales and payables related to pending investment purchases and the securities lending program.
Sales of the securities held in the Funds resulted in cash proceeds of $568 million, $803 million, and $980 million in 2017, 2016, and 2015, respectively, all of which were reinvested. For 2017, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $108 million, which included $83 million related to unrealized gains on securities held in the Funds at December 31, 2017. For 2016, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $38 million, which included $14 million related to unrealized losses on securities held in the Funds at December 31, 2016. For 2015, fair value increases, including reinvested interest and dividends and excluding the Funds' expenses, were $3 million, which included $26 million related to unrealized gains and losses on securities held in the Funds at December 31, 2015. While the investment securities held in the Funds are reported as trading securities, the Funds continue to be managed with a long-term focus. Accordingly, all purchases and sales within the Funds are presented separately in the statements of cash flows as investing cash flows, consistent with the nature of the securities and purpose for which the securities were acquired.
The NRC's minimum external funding requirements are based on a generic estimate of the cost to decommission only the radioactive portions of a nuclear unit based on the size and type of reactor. The Company has filed plans with the NRC designed to ensure that, over time, the deposits and earnings of the Funds will provide the minimum funding amounts prescribed by the NRC.
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Site study cost is the estimate to decommission a specific facility as of the site study year. The decommissioning cost estimates are based on prompt dismantlement and removal of the plant from service. The actual decommissioning costs may vary from these estimates because of changes in the assumed date of decommissioning, changes in NRC requirements, or changes in the assumptions used in making these estimates. The estimated costs of decommissioning are based on the most current study performed in 2015. The site study costs and external trust funds for decommissioning as of December 31, 2017 based on the Company's ownership interests were as follows:
 Plant Hatch 
Plant Vogtle
Units 1 and 2
Decommissioning periods:   
Beginning year2034
 2047
Completion year2075
 2079
 (in millions)
Site study costs: 
Radiated structures$678
 $568
Spent fuel management160
 147
Non-radiated structures64
 89
Total site study costs$902
 $804
External trust funds$583
 $346
For ratemaking purposes, the Company's decommissioning costs are based on the NRC generic estimate to decommission the radioactive portion of the facilities and the site study estimate for spent fuel management as of 2012. Under the 2013 ARP, the Georgia PSC approved annual decommissioning cost for ratemaking of $4 million and $2 million for Plant Hatch and Plant Vogtle Units 1 and 2, respectively. Significant assumptions used to determine the costs for ratemaking include an estimated inflation rate of 2.4% and an estimated trust earnings rate of 4.4%. The Company expects the Georgia PSC to review and adjust, if necessary, the amounts collected in rates for nuclear decommissioning costs in the Company's 2019 base rate case.
Allowance for Funds Used During Construction
The Company records AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the plant through a higher rate base and higher depreciation. The equity component of AFUDC is not included in calculating taxable income. For the years 2017, 2016, and 2015, the average AFUDC rates were 5.6%, 6.9%, and 6.5%, respectively, and AFUDC capitalized was $63 million, $68 million, and $56 million, respectively. AFUDC, net of income taxes, as a percentage of net income after dividends on preferred and preference stock was 3.8%, 4.6%, and 3.9% for 2017, 2016, and 2015, respectively. See Note 3 under "Retail Regulatory Matters – Nuclear Construction" for additional information on the inclusion of construction costs related to Plant Vogtle Units 3 and 4 in rate base effective January 1, 2011.
Impairment of Long-Lived Assets and Intangibles
The Company evaluates long-lived assets for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance or an estimate of undiscounted future cash flows attributable to the assets, as compared with the carrying value of the assets. If an impairment has occurred, the amount of the impairment recognized is determined by either the amount of regulatory disallowance or by estimating the fair value of the assets and recording a loss if the carrying value is greater than the fair value. For assets identified as held for sale, the carrying value is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change.
Storm Damage Recovery
The CompanyGeorgia Power defers and recovers certain costs related to damages from major storms as mandated by the Georgia PSC. Beginning January 1, 2014, the Company is accruing $30During 2021 and 2022, Georgia Power recovered $213 million annually under the 2013 ARP that2019 ARP. Beginning January 1, 2023, Georgia Power is recoverable through base rates. As ofrecovering $31 million annually under the 2022 ARP. At December 31, 2017 and December 31, 2016, the balance in the regulatory asset related to2022, Georgia Power's storm damage reserve balance was $333 million and $206 million, respectively, with approximately $30 million included in other regulatory assets, current for both years and approximately $303 million and $176 million included in other regulatory assets, deferred, respectively. The annual recovery amount is expected to be reviewed by the Georgia PSC and adjusted in future regulatory proceedings. As a result of this
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regulatory treatment, costs related to storms are generally not expected to have a material impact on the Company's earnings. See Note 3 under "Retail Regulatory Matters – Storm Damage Recovery" for additional information.
Environmental Remediation Recovery
The Company maintains a reserve for environmental remediation as mandated by the Georgia PSC. In 2013, the Georgia PSC approved the 2013 ARP including the recovery of approximately $2 million annually through the environmental compliance cost recovery (ECCR) tariff. The Company recognizes a liability for environmental remediation costs only when it determines a loss is probable and reasonably estimable and reduces the reserve as expenditures are incurred. Any difference between the liabilities accrued and cost recovered through rates is deferred as a regulatory asset or liability. The annual recovery amount is expected to be reviewed by the Georgia PSC and adjusted in future regulatory proceedings. As a result of this regulatory treatment, environmental remediation liabilities generally are not expected to have a material impact on the Company's earnings. As of December 31, 2017, the balance of the environmental remediation liability was $22$83 million and is included in other current liabilities. Asregulatory liabilities, deferred on Southern Company's balance sheet and other deferred credits and liabilities on Georgia Power's balance sheet. During 2023, significant storms caused damage to Georgia Power's
II-144

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transmission and distribution facilities. The incremental restoration costs related to these storms exceeded the storm damage reserve and were deferred in the regulatory asset for storm damage. At December 31, 2017, the2023, Georgia Power's regulatory asset balance related to storm damage was $54 million, of under recovered environmental remediation costs was $49which $31 million with approximately $2 millionis included in other regulatory assets, current and approximately $47$23 million included as other regulatory assets, deferred. As of December 31, 2016, the balance of the environmental remediation liability was $17 million and is included in other current liabilities. As of December 31, 2016, the balance of under recovered environmental remediation costs was $35 million, with approximately $2 million included in other regulatory assets, current and approximately $33 million included as other regulatory assets, deferred. See Note 3 under "Environmental Matters – Environmental Remediation" for additional information.
Cash and Cash Equivalents
For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
Materials and Supplies
Generally, materials and supplies include the average cost of transmission, distribution, and generating plant materials. Materials are charged to inventory when purchased and then expensed or capitalized to plant, as appropriate, at weighted average cost when installed.
Fuel Inventory
Fuel inventory includes the average cost of coal, natural gas, and oil, as well as transportation and emissions allowances. Fuel is recorded to inventory when purchased and then expensed, at weighted average cost, as used and recovered by the Company through fuel cost recovery rates approved by the Georgia PSC. Emissions allowances granted by the EPA are included in inventory at zero cost.
Financial Instruments
The Company uses derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, and electricity purchases and sales. All derivative financial instruments are recognized as either assets or liabilitiesdeferred on the balance sheets (included in "Other") and are measured at fair value. See Note 10 for additional information regarding fair value. Substantially all of the Company's bulk energy purchases and sales contracts that meet the definition of a derivative are excluded from fair value accounting requirements because they qualify for the "normal" scope exception, and are accounted for under the accrual method. Derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the Georgia PSC-approved fuel-hedging program result in the deferral of related gains and losses in OCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Any ineffectiveness arising from cash flow hedges is recognized currently in net income. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recorded on a net basis in the statements of income. Cash flows from derivatives are classified on the statements of cash flows in the same category as the hedged item. See Note 11 for additional information regarding derivatives.
The Company offsets fair value amounts recognized for multiple derivative instruments executed with the same counterparty under netting arrangements. Additionally, the Company had no outstanding collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2017.
The Company is exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Company has established controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk.
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Georgia Power Company 2017 Annual Report

Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income, changes in the fair value of qualifying cash flow hedges, and reclassifications for amounts included in net income.
2. RETIREMENT BENEFITS
The Company has a defined benefit, trusteed, pension plan covering substantially all employees. This qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2018. The Company also provides certain defined benefit pension plans for a selected group of management and highly compensated employees. Benefits under these non-qualified pension plans are funded on a cash basis. In addition, the Company provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The Company funds its other postretirement trusts to the extent required by the Georgia PSC and the FERC. For the year ending December 31, 2018, no other postretirement trust contributions are expected.
Actuarial Assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below.
Assumptions used to determine net periodic costs:2017 2016 2015
Pension plans     
Discount rate – benefit obligations4.40% 4.65% 4.18%
Discount rate – interest costs3.72
 3.86
 4.18
Discount rate – service costs4.83
 5.03
 4.49
Expected long-term return on plan assets7.95
 8.20
 8.20
Annual salary increase4.46
 4.46
 3.59
Other postretirement benefit plans     
Discount rate – benefit obligations4.23% 4.49% 4.03%
Discount rate – interest costs3.55
 3.67
 4.03
Discount rate – service costs4.63
 4.88
 4.39
Expected long-term return on plan assets6.79
 6.27
 6.48
Annual salary increase4.46
 4.46
 3.59
Assumptions used to determine benefit obligations:2017
2016
Pension plans


Discount rate3.79%
4.40%
Annual salary increase4.46

4.46
Other postretirement benefit plans


Discount rate3.68%
4.23%
Annual salary increase4.46

4.46
The Company estimates the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of eight different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio.
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An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO as of December 31, 2017 were as follows:
 Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached
Pre-656.50% 4.50% 2026
Post-65 medical5.00
 4.50
 2026
Post-65 prescription10.00
 4.50
 2026
An annual increase or decrease in the assumed medical care cost trend rate of 1% would affect the APBO and the service and interest cost components at December 31, 2017 as follows:
 
1 Percent
Increase
 
1 Percent
Decrease
 (in millions)
Benefit obligation$59
 $50
Service and interest costs2
 2
Pension Plans
The total accumulated benefit obligation for the pension plans was $3.8 billion at December 31, 2017 and $3.5 billion at December 31, 2016. Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$3,800
 $3,615
Service cost74
 70
Interest cost138
 136
Benefits paid(187) (164)
Actuarial (gain) loss363
 143
Balance at end of year4,188
 3,800
Change in plan assets   
Fair value of plan assets at beginning of year3,621
 3,196
Actual return (loss) on plan assets610
 288
Employer contributions14
 301
Benefits paid(187) (164)
Fair value of plan assets at end of year4,058
 3,621
Accrued liability$(130) $(179)
At December 31, 2017, the projected benefit obligations for the qualified and non-qualified pension plans were $4.0 billion and $153 million, respectively. All pension plan assets are related to the qualified pension plan.
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Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's pension plans consist of the following:
 2017 2016
 (in millions)
Prepaid pension costs$23
 $
Other regulatory assets, deferred1,105
 1,129
Other current liabilities(15) (14)
Employee benefit obligations(138) (165)
Presented below are the amounts included in regulatory assets at December 31, 2017 and 2016 related to the defined benefit pension plans that had not yet been recognized in net periodic pension cost along with the estimated amortization of such amounts for 2018.
 2017 2016 
Estimated
Amortization
in 2018
 (in millions)
Prior service cost$14
 $17
 $2
Net (gain) loss1,091
 1,112
 69
Regulatory assets$1,105
 $1,129
  
The changes in the balance of regulatory assets related to the defined benefit pension plans for the years ended December 31, 2017 and 2016 are presented in the following table:
 2017 2016
 (in millions)
Regulatory assets:   
Beginning balance$1,129
 $1,076
Net (gain) loss36
 99
Change in prior service costs
 14
Reclassification adjustments:   
Amortization of prior service costs(3) (5)
Amortization of net gain (loss)(57) (55)
Total reclassification adjustments(60) (60)
Total change(24) 53
Ending balance$1,105
 $1,129
Components of net periodic pension cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$74
 $70
 $73
Interest cost138
 136
 154
Expected return on plan assets(283) (258) (251)
Recognized net (gain) loss57
 55
 76
Net amortization3
 5
 9
Net periodic pension cost$(11) $8
 $61
Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Company has elected to amortize changes in the
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Georgia Power Company 2017 Annual Report

market value of all plan assets over five years rather than recognize the changes immediately. As a result, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets.
Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2017, estimated benefit payments were as follows:
 
Benefit
Payments
 (in millions)
2018$196
2019201
2020207
2021210
2022216
2023 to 20271,156
Other Postretirement Benefits
Changes in the APBO and in the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$847
 $854
Service cost7
 6
Interest cost29
 30
Benefits paid(51) (45)
Actuarial (gain) loss28
 (1)
Retiree drug subsidy3
 3
Balance at end of year863
 847
Change in plan assets   
Fair value of plan assets at beginning of year354
 358
Actual return (loss) on plan assets54
 21
Employer contributions26
 17
Benefits paid(48) (42)
Fair value of plan assets at end of year386
 354
Accrued liability$(477) $(493)
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's other postretirement benefit plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$202
 $213
Employee benefit obligations(477) (493)
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Presented below are the amounts included in regulatory assets at December 31, 2017 and 2016 related to the other postretirement benefit plans that had not yet been recognized in net periodic other postretirement benefit cost along with the estimated amortization of such amounts for 2018.
 2017 2016 
Estimated
Amortization
in 2018
 (in millions)
Prior service cost$5
 $6
 $1
Net (gain) loss197
 207
 9
Regulatory assets$202
 $213
  
The changes in the balance of regulatory assets related to the other postretirement benefit plans for the plan years ended December 31, 2017 and 2016 are presented in the following table:
 2017 2016
 (in millions)
Regulatory assets:   
Beginning balance$213
 $223
Net (gain) loss(2) 
Reclassification adjustments:   
Amortization of prior service costs(1) (1)
Amortization of net gain (loss)(8) (9)
Total reclassification adjustments(9) (10)
Total change(11) (10)
Ending balance$202
 $213
Components of the other postretirement benefit plans' net periodic cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$7
 $6
 $7
Interest cost29
 30
 34
Expected return on plan assets(25) (22) (24)
Net amortization9
 10
 11
Net periodic postretirement benefit cost$20
 $24
 $28
Future benefit payments, including prescription drug benefits, reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans. Estimated benefit payments are reduced by drug subsidy receipts expected as a result of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 as follows:
 
Benefit
Payments
 
Subsidy
Receipts
 Total
 (in millions)
2018$55
 $(3) $52
201955
 (3) 52
202056
 (3) 53
202157
 (4) 53
202258
 (4) 54
2023 to 2027288
 (21) 267
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Benefit Plan Assets
Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code of 1986, as amended. The Company's investment policies for both the pension plan and the other postretirement benefit plans cover a diversified mix of assets, including equity and fixed income securities, real estate, and private equity. Derivative instruments are used primarily to gain efficient exposure to the various asset classes and as hedging tools. The Company minimizes the risk of large losses primarily through diversification but also monitors and manages other aspects of risk.
The composition of the Company's pension plan and other postretirement benefit plan assets as of December 31, 2017 and 2016, along with the targeted mix of assets for each plan, is presented below:
 Target 2017 2016
Pension plan assets:     
Domestic equity26% 31% 29%
International equity25
 25
 22
Fixed income23
 24
 29
Special situations3
 1
 2
Real estate investments14
 13
 13
Private equity9
 6
 5
Total100% 100% 100%
Other postretirement benefit plan assets:     
Domestic equity36% 38% 35%
International equity24
 24
 24
Domestic fixed income33
 31
 35
Special situations1
 1
 1
Real estate investments4
 4
 4
Private equity2
 2
 1
Total100% 100% 100%
The investment strategy for plan assets related to the Company's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Company employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.
Investment Strategies
Detailed below is a description of the investment strategies for each major asset category for the pension and other postretirement benefit plans disclosed above:
Domestic equity. A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.
International equity. A mix of growth stocks and value stocks with both developed and emerging market exposure, managed both actively and through passive index approaches.
Fixed income. A mix of domestic and international bonds.
Trust-owned life insurance (TOLI). Investments of the Company's taxable trusts aimed at minimizing the impact of taxes on the portfolio.
Special situations. Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies as well as investments in promising new strategies of a longer-term nature.
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Real estate investments. Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities.
Private equity. Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.
Benefit Plan Asset Fair Values
Following are the fair value measurements for the pension plan and the other postretirement benefit plan assets as of December 31, 2017 and 2016. The fair values presented are prepared in accordance with GAAP. For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate.
Valuation methods of the primary fair value measurements disclosed in the following tables are as follows:
Domestic and international equity.Investments in equity securities such as common stocks, American depositary receipts, and real estate investment trusts that trade on a public exchange are classified as Level 1 investments and are valued at the closing price in the active market. Equity investments with unpublished prices (i.e. pooled funds) are valued as Level 2, when the underlying holdings used to value the investment are comprised of Level 1 or Level 2 equity securities.
Fixed income.Investments in fixed income securities are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
TOLI. Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate account. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities.
Real estate investments, private equity, and special situations investments.Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.
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The fair values of pension plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1)��(Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$819
 $394
 $
 $
 $1,213
International equity(*)
529
 477
 
 
 1,006
Fixed income:         
U.S. Treasury, government, and agency bonds
 286
 
 
 286
Mortgage- and asset-backed securities
 3
 
 
 3
Corporate bonds
 409
 
 
 409
Pooled funds
 221
 
 
 221
Cash equivalents and other74
 4
 
 
 78
Real estate investments160
 
 
 404
 564
Special situations
 
 
 61
 61
Private equity
 
 
 228
 228
Total$1,582
 $1,794
 $
 $693
 $4,069
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
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 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$686
 $317
 $
 $
 $1,003
International equity(*)
420
 380
 
 
 800
Fixed income:         
U.S. Treasury, government, and agency bonds
 201
 
 
 201
Mortgage- and asset-backed securities
 4
 
 
 4
Corporate bonds
 338
 
 
 338
Pooled funds
 179
 
 
 179
Cash equivalents and other340
 1
 
 
 341
Real estate investments106
 
 
 394
 500
Special situations
 
 
 61
 61
Private equity
 
 
 188
 188
Total$1,552
 $1,420
 $
 $643
 $3,615
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
The fair values of other postretirement benefit plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$53
 $11
 $
 $
 $64
International equity(*)
14
 46
 
 
 60
Fixed income:         
U.S. Treasury, government, and agency bonds
 6
 
 
 6
Corporate bonds
 11
 
 
 11
Pooled funds
 41
 
 
 41
Cash equivalents and other4
 
 
 
 4
Trust-owned life insurance
 173
 
 
 173
Real estate investments6
 
 
 11
 17
Special situations
 
 
 2
 2
Private equity
 
 
 6
 6
Total$77
 $288
 $
 $19
 $384
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
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 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$45
 $9
 $
 $
 $54
International equity(*)
11
 37
 
 
 48
Fixed income:         
U.S. Treasury, government, and agency  bonds
 5
 
 
 5
Corporate bonds
 9
 
 
 9
Pooled funds
 38
 
 
 38
Cash equivalents and other15
 
 
 
 15
Trust-owned life insurance
 162
 
 
 162
Real estate investments3
 
 
 11
 14
Special situations
 
 
 2
 2
Private equity
 
 
 5
 5
Total$74
 $260
 $
 $18
 $352
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Employee Savings Plan
The Company also sponsors a 401(k) defined contribution plan covering substantially all employees. The Company matches a portion of the first 6% of employee base salary contributions. The maximum Company match is 5.1% of an employee's base salary. Total matching contributions made to the plan for 2017, 2016, and 2015 were $26 million, $27 million, and $26 million, respectively.
3. CONTINGENCIES AND REGULATORY MATTERS
General Litigation Matters
In 2011, plaintiffs filed a putative class action against the Company in the Superior Court of Fulton County, Georgia alleging that the Company's collection in rates of municipal franchise fees (all of which are remitted to municipalities) exceeded the amounts allowed in orders of the Georgia PSC and alleging certain state tort law claims. In November 2016, the Georgia Court of Appeals reversed the trial court's previous dismissal of the case and remanded the case to the trial court for further proceedings. The Company filed a petition for writ of certiorari with the Georgia Supreme Court, which was granted on August 28, 2017. A decision from the Georgia Supreme Court is expected in late 2018. The Company believes the plaintiffs' claims have no merit and intends to vigorously defend itself in this matter. The ultimate outcome of this matter cannot be determined at this time.
The Company is also subject to certain claims and legal actions arising in the ordinary course of business. In addition, the Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters. The ultimate outcome of such pending or potential litigation against the Company cannot be predicted at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements.
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Environmental Matters
Environmental Remediation
The Company must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Company may also incur substantial costs to clean up affected sites. See Note 1 under "Environmental Remediation Recovery" for additional information.
The Company recognizes a liability for environmental remediation costs only when it determines a loss is probable and reasonably estimable. The Company's environmental remediation liability as of December 31, 2017 and 2016 was $22 million and $17 million, respectively. The Company has been designated or identified as a potentially responsible party at sites governed by the Georgia Hazardous Site Response Act and/or by the federal Comprehensive Environmental Response, Compensation, and Liability Act, and assessment and potential cleanup of such sites is expected.
The ultimate outcome of these matters cannot be determined at this time; however, as a result of the Company's regulatory treatment for environmental remediation expenses described in Note 1 under "Environmental Remediation Recovery," these matters are not expected to have a material impact on the Company's financial statements.
Nuclear Fuel Disposal Costs
Acting through the DOE and pursuant to the Nuclear Waste Policy Act of 1982, the U.S. government entered into contracts with the Company that require the DOE to dispose of spent nuclear fuel and high level radioactive waste generated at Plant Hatch and Plant Vogtle Units 1 and 2 beginning no later than January 31, 1998. The DOE has yet to commence the performance of its contractual and statutory obligation to dispose of spent nuclear fuel. Consequently, the Company pursued and continues to pursue legal remedies against the U.S. government for its partial breach of contract.
In 2014, the Court of Federal Claims entered a judgment in favor of the Company in its spent nuclear fuel lawsuit seeking damages for the period from January 1, 2005 through December 31, 2010. In 2015, the Company recovered approximately $18 million, based on its ownership interests, which was credited to accounts where the original costs were charged, and used to reduce rate base, fuel, and cost of service for the benefit of customers.
In 2014, the Company filed lawsuits against the U.S. government for the costs of continuing to store spent nuclear fuel at Plant Hatch and Plant Vogtle Units 1 and 2 for the period from January 1, 2011 through December 31, 2013. The damage period was subsequently extended to December 31, 2014. On October 10, 2017, the Company filed additional lawsuits against the U.S. government in the Court of Federal Claims for the costs of continuing to store spent nuclear fuel at Plant Hatch and Plant Vogtle Units 1 and 2 for the period from January 1, 2015 through December 31, 2017. Damages will continue to accumulate until the issue is resolved or storage is provided. No amounts have been recognized in the financial statements as of December 31, 2017 for any potential recoveries from the pending lawsuits. The final outcome of these matters cannot be determined at this time. However, the Company expects to credit any recovery back for the benefit of customers in accordance with direction from the Georgia PSC and, therefore, no material impact on the Company's net income is expected.
On-site dry spent fuel storage facilities are operational at Plant Vogtle Units 1 and 2 and Plant Hatch. Facilities can be expanded to accommodate spent fuel through the expected life of each plant.
FERC Matters
The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies (including the Company) and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' (including the Company's) and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies (including the Company) and Southern Power filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies (including the Company) and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for
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the traditional electric operating companies' (including the Company's) and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies (including the Company) and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' (including the Company's) and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.
On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' (including the Company's) and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies (including the Company) and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
The ultimate outcome of these matters cannot be determined at this time.
Retail Regulatory Matters
Rate Plans
Pursuant to the terms and conditions of a settlement agreement related to Southern Company's acquisition of Southern Company Gas approved by theand Georgia PSC in April 2016, the 2013 ARP will continue in effect until December 31, 2019, and the Company will be required to file its next base rate case by July 1, 2019. Furthermore, through December 31, 2019, the Company and Atlanta Gas Light Company each will retain their respective merger savings, net of transition costs, as defined in the settlement agreement; through December 31, 2022, such net merger savings applicable to each will be shared on a 60/40 basis with their respective customers; thereafter, all merger savings will be retained by customers.
In accordance with the 2013 ARP, the Georgia PSC approved increases to tariffs effective January 1, 2016 as follows: (1) traditional base tariff rates by approximately $49 million; (2) ECCR tariff by approximately $75 million; (3) Demand-Side Management tariffs by approximately $3 million; and (4) Municipal Franchise Fee tariff by approximately $13 million, for a total increase in base revenues of approximately $140 million. There were no changes to these tariffs in 2017.
Under the 2013 ARP, the Company's retail ROE is set at 10.95% and earnings are evaluated against a retail ROE range of 10.00% to 12.00%. Two-thirds of any earnings above 12.00% will be directly refunded to customers, with the remaining one-third retained by the Company. There will be no recovery of any earnings shortfall below 10.00% on an actual basis. In 2015, the Company's retail ROE was within the allowed retail ROE range. In 2016, the Company's retail ROE exceeded 12.00%, and the Company will refund to retail customers approximately $44 million in 2018, as approved by the Georgia PSC on January 16, 2018. In 2017, the Company's retail ROE was within the allowed retail ROE range, subject to review and approval by the Georgia PSC.
On January 19, 2018, the Georgia PSC issued an order on the Tax Reform Legislation, which was amended on February 16, 2018 (Tax Order). In accordance with the Tax Order, the Company is required to submit its analysis of the Tax Reform Legislation and related recommendations to address the related impacts on the Company's cost of service and annual revenue requirements by March 6, 2018. The ultimate outcome of this matter cannot be determined at this time.
Integrated Resource Plan
In July 2016, the Georgia PSC approved the Company's triennial Integrated Resource Plan (2016 IRP) including the decertification and retirement of Plant Mitchell Units 3, 4A, and 4B (217 MWs) and Plant Kraft Unit 1 (17 MWs), as well as the decertification of the Intercession City unit (143 MWs total capacity). In August 2016, the Plant Mitchell and Plant Kraft units were retired and the Company sold its 33% ownership interest in the Intercession City unit to Duke Energy Florida, LLC.
Additionally, the Georgia PSC approved the Company's environmental compliance strategy and related expenditures proposed in the 2016 IRP, including measures taken to comply with existing government-imposed environmental mandates, subject to limits on expenditures for Plant McIntosh Unit 1 and Plant Hammond Units 1 through 4.
The Georgia PSC approved the reclassification of the remaining net book value of Plant Mitchell Unit 3 and costs associated with materials and supplies remaining at the unit retirement date to a regulatory asset. Recovery of the unit's net book value will continue through December 31, 2019, as provided in the 2013 ARP. The timing of the recovery of the remainingPower's balance of the unit's net book value as of December 31, 2019 and costs associated with materials and supplies remaining at the unit retirement date was deferred for consideration in the Company's 2019 base rate case.
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The Georgia PSC also approved the Renewable Energy Development Initiative (REDI) to procure an additional 1,200 MWs of renewable resources primarily utilizing market-based prices established through a competitive bidding process with expected in-service dates between 2018 and 2021. Additionally, 200 MWs of self-build capacity for use by the Company was approved, as well as consideration for no more than 200 MWs of capacity as part of a renewable commercial and industrial program.
In 2017, the Company filed for and received certification for 510 MWs of REDI utility-scale PPAs for solar generation resources, which are expected to be in operation by the end of 2019. The Company also filed for and received approval to develop several solar generation projects to fulfill the approved self-build capacity.
In the 2016 IRP, the Georgia PSC also approved recovery of costs up to $99 million through June 30, 2019 to preserve nuclear generation as an option at a future generation site in Stewart County, Georgia. On March 7, 2017, the Georgia PSC approved the Company's decision to suspend work at the site due to changing economics, including lower load forecasts and fuel costs. The timing of recovery for costs incurred of approximately $50 million is expected to be determined by the Georgia PSC in a future rate case.
Fuel Cost Recovery
The Company has established fuel cost recovery rates approved by the Georgia PSC. In 2015, the Georgia PSC approved the Company's request to lower annual billings by approximately $350 million effective January 1, 2016. In May 2016, the Georgia PSC approved the Company's request to further lower annual billings under an interim fuel rider by approximately $313 million effective June 1, 2016, which expired on December 31, 2017. The Georgia PSC will review the Company's cumulative over or under recovered fuel balance no later than September 1, 2018 and evaluate the need to file a fuel case unless the Company deems it necessary to file a fuel case at an earlier time. The Company continues to be allowed to adjust its fuel cost recovery rates under an interim fuel rider prior to the next fuel case if the under recovered fuel balance exceeds $200 million.
The Company's fuel cost recovery mechanism includes costs associated with a natural gas hedging program, as revised and approved by the Georgia PSC, allowing the use of an array of derivative instruments within a 48-month time horizon.
The Company's under recovered fuel balance totaled $165 million at December 31, 2017 and is included in current assets. At December 31, 2016, the Company's over recovered fuel balance totaled $84 million and is included in over recovered fuel clause revenues, current.
Fuel cost recovery revenues as recorded on the financial statements are adjusted for differences in actual recoverable fuel costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor will not have a significant effect on the Company's revenues or net income, but will affect cash flow.
Storm Damage Recovery
The Company is accruing $30 million annually through December 31, 2019, as provided in the 2013 ARP, for incremental operating and maintenance costs of damage from major storms to its transmission and distribution facilities. Hurricanes Irma and Matthew caused significant damage to the Company's transmission and distribution facilities during September 2017 and October 2016, respectively. The incremental restoration costs related to these hurricanes deferred in the regulatory asset for storm damage totaled approximately $260 million. At December 31, 2017, the total balance in the regulatory asset related to storm damage was $333 million.sheets. The rate of storm damage cost recovery is expected to be adjusted in future regulatory proceedings as part of the Company's next base rate case required to be filed by July 1, 2019.necessary. As a result of this regulatory treatment, costs related to storms are not expected to have a material impact on Southern Company's or Georgia Power's net income but do impact the Company's financial statements.related operating cash flows. See Note 1 under "Storm Damage Recovery"and Reliability Reserves" for additional information regarding the Company's storm damage reserve.information.
Nuclear Construction
Project Status
In 2009, the Georgia PSC certified construction of Plant Vogtle Units 3 and 4.4, in which Georgia Power holds a 45.7% ownership interest. In 2012, the NRC issued the related combined construction and operating licenses, which allowed full construction of the two AP1000 nuclear units (with electric generating capacity of approximately 1,100 MWs each) and related facilities to begin. Until March 2017, construction on Plant Vogtle Units 3 and 4 continued under the Vogtle 3 and 4 Agreement, which was a substantially fixed price agreement. On March 29, 2017, the EPC Contractor filed for bankruptcy protection under Chapter 11 of the U.S. Bankruptcy Code.
In connection with the EPC Contractor's bankruptcy filing the Company, acting for itself and as agent for the Vogtle Owners, entered into the Interim Assessment Agreement with the EPC Contractor to allow construction to continue. The Interim Assessment Agreement expired on July 27,in March 2017, when the Vogtle Services Agreement became effective. In August 2017, following completion of comprehensive cost to complete and cancellation cost assessments, the Company filed its seventeenth
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VCM report with the Georgia PSC, which included a recommendation to continue construction of Plant Vogtle Units 3 and 4, with Southern Nuclear serving as project manager and Bechtel serving as the primary construction contractor. On December 21, 2017, the Georgia PSC approved the Company's recommendation to continue construction.
The Company expects Plant Vogtle Units 3 and 4 to be placed in service by November 2021 and November 2022, respectively. The Company's revised capital cost forecast for its 45.7% proportionate share of Plant Vogtle Units 3 and 4 is $8.8 billion ($7.3 billion after reflecting the impact of payments received under the Guarantee Settlement Agreement and the Customer Refunds, each as defined herein). The Company's CWIP balance for Plant Vogtle Units 3 and 4 was $3.3 billion at December 31, 2017, which is net of the Guarantee Settlement Agreement payments less the Customer Refunds. The Company estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
Vogtle 3 and 4 Agreement and EPC Contractor Bankruptcy
In 2008, the Company, acting for itself and as agent for the Vogtle Owners, entered into the Vogtle 3 and 4 Agreement. Under the terms of the Vogtle 3 and 4 Agreement, the Vogtle Owners agreed to pay a purchase price subject to certain price escalations and adjustments, including fixed escalation amounts and index-based adjustments, as well as adjustments for change orders, and performance bonuses for early completion and unit performance. Under the Toshiba Guarantee, Toshiba guaranteed certain payment obligations of the EPC Contractor, including any liability of the EPC Contractor for abandonment of work. In the first quarter 2016, Westinghouse delivered to the Vogtle Owners a total of $920 million of letters of credit from financial institutions (Westinghouse Letters of Credit) to secure a portion of the EPC Contractor's potential obligations under the Vogtle 3 and 4 Agreement.
Subsequent to the EPC Contractor bankruptcy filing, a number of subcontractors to the EPC Contractor alleged non-payment by the EPC Contractor for amounts owed for work performed on Plant Vogtle Units 3 and 4. The Company, acting for itself and as agent for the Vogtle Owners, has taken actions to remove liens filed by these subcontractors through the posting of surety bonds. Related to such liens, certain subcontractors have filed, and additional subcontractors may file, actions against the EPC Contractor and the Vogtle Owners to preserve their payment rights with respect to such claims. All amounts associated with the removal of subcontractor liens and other EPC Contractor pre-petition accounts payable have been paid or accrued as of December 31, 2017.
On June 9, 2017, the Company and the other Vogtle Owners and Toshiba entered into a settlement agreement regarding the Toshiba Guarantee (Guarantee Settlement Agreement). Pursuant to the Guarantee Settlement Agreement, Toshiba acknowledged the amount of its obligation was $3.68 billion (Guarantee Obligations), of which the Company's proportionate share was approximately $1.7 billion. The Guarantee Settlement Agreement provided for a schedule of payments for the Guarantee Obligations beginning in October 2017 and continuing through January 2021. Toshiba made the first three payments as scheduled. On December 8, 2017, the Company, the other Vogtle Owners, certain affiliates of the Municipal Electric Authority of Georgia (MEAG Power), and Toshiba entered into Amendment No. 1 to the Guarantee Settlement Agreement (Guarantee Settlement Agreement Amendment). The Guarantee Settlement Agreement Amendment provided that Toshiba's remaining payment obligations under the Guarantee Settlement Agreement were due and payable in full on December 15, 2017, which Toshiba satisfied on December 14, 2017. Pursuant to the Guarantee Settlement Agreement Amendment, Toshiba was deemed to be the owner of certain pre-petition bankruptcy claims of the Company, the other Vogtle Owners, and certain affiliates of MEAG Power against Westinghouse, and the Company and the other Vogtle Owners surrendered the Westinghouse Letters of Credit.
Additionally, on June 9, 2017, the Company, acting for itself and as agent for the other Vogtle Owners, entered into several transitional arrangements to allow construction to continue. In July 2017, Georgia Power, acting for itself and as agent for the EPC Contractorother Vogtle Owners, entered into the Vogtle Services Agreement, which was amendedwhereby Westinghouse provides facility design and restatedengineering services, procurement and technical support, and staff augmentation on July 20, 2017. On July 20, 2017, the bankruptcy court approved the EPC Contractor's motion seeking authorization to (i) enter into the Vogtle Services Agreement, (ii) assumea time and assign to the Vogtle Owners certain project-related contracts, (iii) join the Vogtle Owners as counterparties to certain assumed project-related contracts, and (iv) reject the Vogtle 3 and 4 Agreement.materials cost basis. The Vogtle Services Agreement and the EPC Contractor's rejection of the Vogtle 3 and 4 Agreement, became effective upon approval by the DOE on July 27, 2017. The Vogtle Services Agreementprovides that it will continue until the start-up and testing of Plant Vogtle Units 3 and 4 are complete and electricity is generated and sold from both units. The Vogtle Services Agreement is terminable by the Vogtle Owners upon 30 days' written notice.
EffectiveIn October 23, 2017, the Company,Georgia Power, acting for itself and as agent for the other Vogtle Owners, entered into a construction completion agreement with Bechtel, whereby Bechtel will serve asexecuted the primary contractor for the remaining construction activities for Plant Vogtle Units 3 and 4 (Bechtel Agreement). Facility design and engineering remains the responsibility of the EPC Contractor under the Vogtle Services Agreement. The Bechtel Agreement, is a cost reimbursable plus fee arrangement, wherebyunder which Bechtel will beis reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Vogtle Owner is severally (not jointly) liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The
See Note 8 under "Long-term Debt – DOE Loan Guarantee Borrowings" for information on the Amended and Restated Loan Guarantee Agreement, including applicable covenants, events of default, and mandatory prepayment events.
Cost and Schedule
Georgia Power's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4, including contingency, through the second quarter 2024 is as follows:
(in millions)
Base project capital cost forecast(a)(b)
$10,717 
Construction contingency estimate36 
Total project capital cost forecast(a)(b)
10,753 
Net investment at December 31, 2023(b)
(10,564)
Remaining estimate to complete$189
(a)Includes approximately $610 million of costs that are not shared with the other Vogtle Owners, may terminateincluding $33 million of construction monitoring costs, and approximately $567 million of incremental costs under the cost-sharing provisions of the joint ownership agreements described below. Excludes financing costs expected to be capitalized through AFUDC of approximately $440 million, of which $417 million had been accrued through December 31, 2023.
(b)Net of $1.7 billion received from Toshiba under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds.
Georgia Power estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.53 billion, of which $3.50 billion had been incurred through December 31, 2023.
Georgia Power placed Unit 3 in service on July 31, 2023. As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts for Unit 4 on a regular basis to incorporate current information available, particularly in the areas of start-up testing and related test results and engineering support. As of December 31, 2023, based on completion of construction work and the assessment of start-up and pre-operational testing remaining, Southern Nuclear has an estimated $36 million for construction contingency remaining in the estimate to complete. This contingency is projected to be allocated in the future to address any further Unit 4 schedule extensions or remediation of other issues discovered during start-up testing.
Hot functional testing for Unit 4 was completed on May 1, 2023. On July 20, 2023, Southern Nuclear announced that all Unit 4 ITAACs had been submitted to the NRC, and, on July 28, 2023, the NRC published its 103(g) finding that the accepted criteria in the combined license for Unit 4 had been met, which allowed nuclear fuel to be loaded and start-up testing to begin. Fuel load for
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Unit 4 was completed on August 19, 2023. On October 6, 2023, Georgia Power Company 2017 Annual Report
announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified a motor fault in one of four reactor coolant pumps (RCPs). This RCP was replaced with an on-site spare RCP from inventory.

On February 1, 2024, Georgia Power announced that during start-up and pre-operational testing for Unit 4, Southern Nuclear identified, and has remediated, vibrations associated with certain piping within the cooling system. Considering the remaining pre-operational testing, Unit 4 is projected to be placed in service during the second quarter 2024. On February 14, 2024, Unit 4 achieved self-sustaining nuclear fission, commonly referred to as initial criticality.
the Bechtel Agreement at any time for their convenience, providedWith Unit 3's four RCPs operating as designed, Southern Nuclear believes that the Vogtle Ownersmotor fault on this single Unit 4 RCP is an isolated event. However, any findings related to the root cause of the motor fault on the single Unit 4 RCP could require engineering changes or remediation related to the other seven Unit 3 and Unit 4 RCPs. The projected schedule for Unit 4 significantly depends on the progression of start-up and pre-operational testing, which may be impacted by equipment or other operational failures. As Unit 4 progresses further through testing, ongoing and potential future challenges may also include the management of contractors and vendors; the availability of materials and parts, and/or related cost escalation; the availability of supervisory and technical support resources; and the timeframe and duration of pre-operational testing. New challenges also may continue to arise as Unit 4 moves further into testing and start-up, which may result in required engineering changes or remediation related to plant systems, structures, or components (some of which are based on new technology that only within the last several years began initial operation in the global nuclear industry at this scale). These challenges may result in further schedule delays and/or cost increases.
With the receipt of the NRC's 103(g) findings for Units 3 and 4 in August 2022 and July 2023, respectively, the site is subject to the NRC's operating reactor oversight process and must meet applicable technical and operational requirements contained in its operating license. Various design and other licensing-based compliance matters may result in additional license amendment requests or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the Unit 4 project schedule that could result in increased costs.
The ultimate outcome of these matters cannot be determined at this time. However, any extension of the in-service date beyond June 2024 for Unit 4, including the joint owner cost sharing impacts described below, is estimated to result in additional base capital costs for Georgia Power of up to $25 million per month as well as any additional related construction, support resources, or testing costs. Pursuant to the regulatory orders discussed below, any further changes to the capital cost forecast will not be recoverable through regulated rates and will be required to pay amounts relatedbe charged to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs, and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Vogtleincome. Such charges could be material.
Joint Owner suspensions of work, certain breaches of the Bechtel Agreement by the Vogtle Owners, Vogtle Owner insolvency, and certain other events. Pursuant to the Loan Guarantee Agreement between the Company and the DOE, the Company is required to obtain the DOE's approval of the Bechtel Agreement prior to obtaining any further advances under the Loan Guarantee Agreement.Contracts
OnIn November 2, 2017, the Vogtle Owners entered into an amendment to their joint ownership agreements for Plant Vogtle Units 3 and 4 (as amended, Vogtle Joint Ownership Agreements) to provide for, among other conditions, additional Vogtle Owner approval requirements. PursuantEffective in August 2018, the Vogtle Owners further amended the joint ownership agreements to clarify and provide procedures for certain provisions of the joint ownership agreements related to adverse events that require the vote of the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 to continue construction (as amended, and together with the November 2017 amendment, the Vogtle Joint Ownership Agreements). The Vogtle Joint Ownership Agreements also confirm that the Vogtle Owners' sole recourse against Georgia Power or Southern Nuclear for any action or inaction in connection with their performance as agent for the Vogtle Owners is limited to removal of Georgia Power and/or Southern Nuclear as agent, except in cases of willful misconduct.
Amendments to the Vogtle Joint Ownership Agreements
In connection with a September 2018 vote by the Vogtle Owners to continue construction, Georgia Power entered into (i) a binding term sheet (Vogtle Owner Term Sheet) with the other Vogtle Owners and MEAG Power's wholly-owned subsidiaries MEAG Power SPVJ, LLC (MEAG SPVJ), MEAG Power SPVM, LLC (MEAG SPVM), and MEAG Power SPVP, LLC (MEAG SPVP) to take certain actions which partially mitigate potential financial exposure for the other Vogtle Owners, including additional amendments to the Vogtle Joint Ownership Agreements and the purchase of PTCs from the other Vogtle Owners at pre-established prices, and (ii) a term sheet (MEAG Term Sheet) with MEAG Power and MEAG SPVJ to provide up to $300 million of funding with respect to MEAG SPVJ's ownership interest in Plant Vogtle Units 3 and 4 under certain circumstances. In January 2019, Georgia Power, MEAG Power, and MEAG SPVJ entered into an agreement to implement the provisions of the MEAG Term Sheet. In February 2019, Georgia Power, the other Vogtle Owners, and MEAG Power's wholly-owned subsidiaries MEAG SPVJ, MEAG SPVM, and MEAG SPVP entered into certain amendments to the Vogtle Joint Ownership Agreements to implement the provisions of the Vogtle Owner Term Sheet (Global Amendments).
Pursuant to the Global Amendments: (i) each Vogtle Owner paid its proportionate share of qualifying construction costs for Plant Vogtle Units 3 and 4 based on its ownership percentage up to the estimated cost at completion (EAC) for Plant Vogtle Units 3 and 4, of which Georgia Power's share is $8.4 billion (VCM 19 Forecast Amount), plus $800 million; (ii) Georgia Power was
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responsible for 55.7% of actual qualifying construction costs between $800 million and $1.6 billion over the VCM 19 Forecast Amount (resulting in $80 million of potential additional costs to Georgia Power), with the remaining Vogtle Owners responsible for 44.3% of such costs pro rata in accordance with their respective ownership interests; and (iii) Georgia Power was responsible for 65.7% of qualifying construction costs between $1.6 billion and $2.1 billion over the VCM 19 Forecast Amount (resulting in a further $100 million of potential additional costs to Georgia Power), with the remaining Vogtle Owners responsible for 34.3% of such costs pro rata in accordance with their respective ownership interests. The Global Amendments provide that if the EAC was revised and exceeded the VCM 19 Forecast Amount by more than $2.1 billion, each of the other Vogtle Owners had a one-time option at the time the project budget cost forecast was so revised to tender a portion of its ownership interest to Georgia Power in exchange for Georgia Power's agreement to pay 100% of such Vogtle Owner's remaining share of total construction costs in excess of the VCM 19 Forecast Amount plus $2.1 billion.
In addition, pursuant to the Global Amendments, the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 must vote to continue construction if certain adverse events (Project Adverse Events) occur, including, among other events: (i) the bankruptcy of Toshiba; (ii) the termination or rejection in bankruptcy of certain agreements, including the Vogtle Services Agreement, the Bechtel Agreement, or the Bechtel Agreement;agency agreement with Southern Nuclear; (iii) Georgia Power's public announcement of its intention not to submit for rate recovery any portion of its investment in Plant Vogtle Units 3 and 4 or the Georgia PSC or the Company determines that any of the Company'sGeorgia Power's costs relating to the construction of Plant Vogtle Units 3 and 4 will not be recovered in retail rates, because suchexcluding any additional amounts paid by Georgia Power on behalf of the other Vogtle Owners pursuant to the Global Amendments described above and the first 6% of costs during any six-month VCM reporting period that are deemed unreasonabledisallowed by the Georgia PSC for recovery, or imprudent; orfor which Georgia Power elects not to seek cost recovery, through retail rates; and (iv) an increase in the construction budget contained inincremental extension of one year or more from the seventeenth VCM report estimated in-service dates of moreNovember 2021 and November 2022 for Units 3 and 4, respectively. The schedule extension announced in February 2022 triggered the requirement for a vote to continue construction and all the Vogtle Owners voted to continue construction. The filing of Georgia Power's prudency application with the Georgia PSC, which included Georgia Power's public announcement of its intention not to submit for rate recovery an amount that is greater than $1 billion or extensionthe first 6% of costs during any six-month VCM reporting period, triggered the requirement for a vote to continue construction and all the Vogtle Owners voted to continue construction. See additional information on Georgia Power's prudency application filing below.
In September 2022, Georgia Power and MEAG Power reached an agreement to resolve a dispute regarding the cost-sharing and tender provisions of the Global Amendments. Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project schedule contained incapital cost forecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the seventeenth VCM report of more than one year.current project capital cost forecast, with no further adjustment for force majeure costs. In addition, pursuantMEAG Power agreed to vote to continue construction upon occurrence of a Project Adverse Event unless the commercial operation date of either of Plant Vogtle Joint Ownership Agreements,Unit 3 or Unit 4 is not projected to occur by December 31, 2025.
On October 5, 2023 and October 17, 2023, Georgia Power reached agreements with OPC and Dalton, respectively, to resolve its respective dispute with each of OPC and Dalton regarding the required approvalcost-sharing and tender provisions of holdersthe Global Amendments. Under the terms of the agreements with OPC and Dalton, among other items, (i) each of OPC and Dalton retracted its exercise of the tender option and will retain its full ownership interestsinterest in Plant Vogtle Units 3 and 4, is at least (i) 90%(ii) Georgia Power made payments immediately after execution of the agreements of $308 million and $17 million to OPC and Dalton, respectively, representing payment for a changeportion of each of OPC's and Dalton's costs of construction for Plant Vogtle Units 3 and 4 previously incurred, (iii) Georgia Power will pay a portion of each of OPC's and Dalton's further costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will be in an aggregate amount of approximately $105 million and $6 million for OPC and Dalton, respectively, based on the current project capital cost forecast, and (iv) Georgia Power will pay 66% of each of OPC's and Dalton's costs of construction with respect to any amounts above the current project capital cost forecast, with no further adjustment for force majeure costs.
Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing provisions of the primary construction contractor and (ii) 67% for material amendments to the Vogtle Services Agreement or agreements with Southern Nuclear or the primary construction contractor,Global Amendments, including the Bechtel Agreement. settlement with MEAG Power. Based on the current project capital cost forecast and the settlements with OPC and Dalton described above, Georgia Power recorded a pre-tax charge to income of approximately $160 million ($120 million after tax) in the third quarter 2023. These charges are included in the total project capital cost forecast and will not be recovered from retail customers.
The ultimate impact of these matters on the project capital cost forecast for Plant Vogtle Joint Ownership Agreements also confirm that the Vogtle Owners' sole recourse against the Company or Southern Nuclear for any action or inaction in connection with their performance as agent for the Vogtle Owners is limitedUnits 3 and 4 cannot be determined at this time.
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Regulatory Matters
In 2009, the Georgia PSC voted to certify construction of Plant Vogtle Units 3 and 4 with a certified capital cost of $4.418 billion. In addition, in 2009 the Georgia PSC approved inclusion of the Plant Vogtle Units 3 and 4 related CWIP accounts in rate base, and the State of Georgia enacted the Georgia Nuclear Energy Financing Act, which allows the CompanyGeorgia Power to recover financing costs for nuclear construction projects certified by the Georgia PSC.Plant Vogtle Units 3 and 4. Financing costs are recovered on all applicable certified costs through annual adjustments to the NCCR tariff up to the certified capital cost of $4.418 billion. As ofAt December 31, 2017, the Company2023, Georgia Power had recovered approximately $1.6$3.0 billion of financing costs. On January 30, 2018,Financing costs related to capital costs above $4.418 billion up to $7.562 billion approved for recovery as described below are being recognized through AFUDC and will be recovered through retail rates over the Company filedlife of Plant Vogtle Units 3 and 4; however, Georgia Power is not recording AFUDC related to decreaseany capital costs in excess of $7.562 billion. In December 2022, the Georgia PSC approved Georgia Power's filing to increase the NCCR tariff by approximately $50$36 million annually, effective AprilJanuary 1, 2018, pending2023. On November 1, 2023, Georgia PSC approval.Power filed a request to continue for 2024 the NCCR tariff that was effective during 2023. The decrease reflects the payments received under the Guarantee Settlement Agreement, refunds to customers ordered by the Georgia PSC aggregating approximately $188 million (Customer Refunds), and the estimated effects of Tax Reform Legislation. The Customer Refunds were recognized as a regulatory liability as of December 31, 2017 and will be paid in three installments of $25 to each retail customer no later than the third quarter 2018.
The Company is required to file semi-annual VCM reports with the Georgia PSC by February 28 and August 31 each year. In October 2013, in connection with the eighth VCM report, the Georgia PSC approved a stipulation (2013 Stipulation) between the Company and the staff of the Georgia PSC to waiveaccepted the requirement to amend the Plant Vogtle Units 3proposal and 4 certificate in accordance with the 2009 certification order until the completion of Plant Vogtle Unit 3, or earlier if deemed appropriate byno further approval from the Georgia PSC was required. See additional information below on AFUDC and the Company.NCCR tariff following commercial operation of Unit 4.
On December 20,In 2016, the Georgia PSC voted to approve a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with the fifteenth VCM report. On December 21, 2017,In January 2018, the Georgia PSC voted to approve (and issued its relatedan order on January 11, 2018) certain recommendations made by the Company in theapproving Georgia Power's seventeenth VCM report and modifyingmodified the Vogtle Cost Settlement Agreement. The Vogtle Cost Settlement Agreement, as modified by the January 11, 2018 order, resolved the followingcertain regulatory matters related to Plant Vogtle Units 3 and 4:4 including, but not limited to: (i) none of the $3.3 billion of costs incurred through December 31, 2015 and reflected in the fourteenth VCM report should be disallowed from rate base on the basis of imprudence; (ii) the Contractor Settlement Agreement was reasonable and prudent and none of the amounts paid pursuant to the Contractor Settlement Agreement should be disallowed from rate base on the basis of imprudence; (iii) (a) capital costs incurred up to $5.680 billion would be presumed to be reasonable and prudent with the burden of proof on any party challenging such costs, (b) the Company would have the burden to show that any capital costs above $5.680 billion were prudent, and (c) a revised capital cost forecast of $7.3 billion (after reflecting the impact of payments received under the Guarantee Settlement Agreement and Customer Refunds) isrelated customer refunds) was found reasonable; (iv) construction of Plant Vogtle Units 3 and 4 should be completed, with Southern Nuclear serving as project manager and Bechtel as primary contractor; (v) approved and deemed reasonable the Company's revised schedule placing Plant Vogtle Units 3 and 4 in service in November 2021 and November 2022, respectively;
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NOTES (continued)
Georgia Power Company 2017 Annual Report

(vi)(ii) confirmed that the revised cost forecast does not represent a cost cap and that prudence decisionsproceeding on cost recovery will be made at a later date,would occur following Unit 4 fuel load, consistent with applicable Georgia law; (vii)(iii) reduced the ROE used to calculate the NCCR tariff (a) from 10.95% (the ROE rate setting point authorized by the Georgia PSC in the 2013 ARP)at that time) to 10.00% effective January 1, 2016, (b) from 10.00% to 8.30%, effective January 1, 2020, and (c) from 8.30% to 5.30%, effective January 1, 2021 (provided that the ROE in no case will be less than the Company'sGeorgia Power's average cost of long-term debt); (viii)and (iv) reduced the ROE used for AFUDC equity for Plant Vogtle Units 3 and 4 from 10.00% to the Company'sGeorgia Power's average cost of long-term debt, effective January 1, 2018; and (ix) agreed that upon Unit 3 reaching commercial operation, retail base rates would be adjusted to include carrying costs on those capital costs deemed prudent in the Vogtle Cost Settlement Agreement. 2018.
The January 11, 2018 order also stated that if Plant Vogtle Units 3 and 4 are not commercially operational by June 1, 2021 and June 1, 2022, respectively, the ROE used to calculate the NCCR tariff will be further reduced by 10 basis points each month (but not lower than the Company'sGeorgia Power's average cost of long-term debt) until the respective unitUnit is commercially operational. The ROE reductions negatively impacted earnings by approximately $20$310 million, $300 million, and $270 million in 20162023, 2022, and $25 million in 20172021, respectively, and are estimated to have a negative earnings impactsimpact of approximately $120$90 million in 2018 and an aggregate of $585 million from 2019 to 2022. 2024.
In its January 11, 2018 order,2021, the Georgia PSC stated if other certain conditions and assumptions uponapproved an order under which the Company's seventeenth VCM report are based do not materialize, both the CompanyGeorgia Power would include in rate base an allocation of $2.1 billion to Plant Vogtle Unit 3 and the Georgia PSC reserveCommon Facilities from the right to reconsider the decision to continue construction.
On February 12, 2018, Georgia Interfaith Power & Light, Inc. and Partnership for Southern Equity, Inc. filed a petition appealing the Georgia PSC's January 11, 2018 order with the Fulton County Superior Court. The Company believes the appeal has no merit; however, an adverse outcome in this appeal could have a material impact on the Company's results of operations, financial condition, and liquidity.
The IRS allocated PTCs to each$3.6 billion of Plant Vogtle Units 3 and 4 which originally requiredcosts previously deemed prudent by the applicable unitGeorgia PSC and would recover the related depreciation expense through retail base rates effective the month after Unit 3 is placed in service. In compliance with the Georgia PSC order, Georgia Power increased annual retail base rates by $318 million effective August 1, 2023 based on the in-service date of July 31, 2023 for Unit 3. The related increase in annual retail base rates included recovery of all projected operations and maintenance expenses for Unit 3 and the Common Facilities and other related costs of operation, partially offset by the related PTCs. Financing costs (debt and equity) on the remaining portion of the total Unit 3 and the Common Facilities construction costs continue to be recovered through the NCCR tariff or deferred. Georgia Power is deferring as a regulatory asset the debt component of financing costs ($14 million at December 31, 2023) as well as the remaining depreciation expense ($17 million at December 31, 2023) until Unit 4 costs are placed in service before 2021. Underretail base rates. The equity component of financing costs ($23 million at December 31, 2023) represents an unrecognized ratemaking amount that is not reflected on Georgia Power's balance sheets. This amount will be recognized in Georgia Power's income statements in the Bipartisan Budget Act of 2018,periods it is billable to customers.
On August 19, 2023, fuel load for Unit 4 was completed, and, on August 30, 2023, Georgia Power filed an application to adjust rates to include reasonable and prudent Plant Vogtle Units 3 and 4 continue to qualify for PTCs. The nominal value of the Company's portion of the PTCs is approximately $500 million per unit.
In its January 11, 2018 order,costs (Application). On December 19, 2023, the Georgia PSC voted to approve the Application as modified by the related stipulated agreement (Prudency Stipulation) among Georgia Power, the staff of the Georgia PSC, and certain intervenors.
While recognizing the Prudency Stipulation, the Application provided the necessary support to justify the reasonableness, prudence, and recovery of $8.826 billion in total construction and capital costs, $1.07 billion in associated retail rate base items, and the operating costs related to the full operation and output of Plant Vogtle Units 3 and 4. Under the terms of the approved Prudency Stipulation, Georgia Power will recover $7.562 billion in total construction and capital costs and associated retail rate base items of $1.02 billion, which includes AFUDC financing costs above $4.418 billion (the Georgia PSC-certified amount) up to $7.562 billion. Georgia Power will also approved $542recover projected operations and maintenance expenses, depreciation expense, nuclear decommissioning accruals, and property taxes, net of projected PTCs. After considering construction and capital costs already in
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retail base rates of $2.1 billion and $362 million of associated retail rate base items (approved by the Georgia PSC in 2021) and upon achieving commercial operation of Unit 4, Georgia Power will include in retail rate base the remaining $5.462 billion of construction and capital costs incurred duringas well as $656 million of associated retail rate base items.
When the seventeenth VCM reporting period (January 1, 2017rate adjustment occurs, Georgia Power's NCCR tariff will cease to June 30, 2017). Thebe collected and financing costs will be included in Georgia Power's general retail revenue requirements. Further, as included in the approved Prudency Stipulation, if commercial operation for Unit 4 is not achieved by March 31, 2024, Georgia Power's ROE used to determine the NCCR tariff and calculate AFUDC will be reduced to zero, which will result in an estimated negative impact to earnings of approximately $30 million per month until the month following the date commercial operation for Unit 4 is achieved. As of each Unit's respective first refueling outage, if the respective Unit's performance has materially deviated from expected performance, the Georgia PSC has approved seventeen VCM reports coveringmay order Georgia Power to credit customers for operations and maintenance expenses or disallow costs associated with the periods through June 30, 2017, including totalrepair or replacement of any system, structure, or component found to have caused the material deviation in performance if proven to be the result of imprudent engineering, construction, capital costs incurred through that dateprocurement, testing, or start-up.
Annual retail base revenues will increase approximately $729 million and the average retail base rates will be adjusted by approximately 5% (net of $4.4 billion. the elimination of the NCCR tariff described above) effective the first day of the month after Unit 4 achieves commercial operation.
The Company expects to file its eighteenth VCM report on February 28, 2018 requesting approval of approximately $450 million of construction capital costs (before payments received under the Guarantee Settlement AgreementApplication and the Customer Refunds) incurred from July 1, 2017 through December 31, 2017. The Company's CWIP balancePrudency Stipulation resolves all issues for determination by the Georgia PSC regarding the reasonableness, prudence, and cost recovery for the remaining Plant Vogtle Units 3 and 4 construction and capital costs not already in retail base rates.
As a result of the Georgia PSC's approval of the Prudency Stipulation, Georgia Power recorded a pre-tax credit to income of approximately $228 million ($170 million after tax) in the fourth quarter 2023 to recognize CWIP costs previously charged to income, which are now recoverable through retail rates. Associated AFUDC on these costs was approximately $4.8 billion as of December 31, 2017, or $3.3 billion net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.also recognized.
The ultimate outcome of these matters cannot be determined at this time.
Cost
Mississippi Power
Mississippi Power's rates and Schedule
The Company's approximate proportionate sharecharges for service to retail customers are subject to the regulatory oversight of the remaining estimated capitalMississippi PSC. Mississippi Power's rates are a combination of base rates and several separate cost recovery clauses for specific categories of costs. These separate cost recovery clauses address such items as fuel and purchased power, ad valorem taxes, property damage, and the costs of compliance with environmental laws and regulations. Costs not addressed through one of the specific cost recovery clauses are expected to complete Plant Vogtle Units 3be recovered through Mississippi Power's base rates.
Performance Evaluation Plan
Mississippi Power's retail base rates generally are set under the PEP, a rate plan approved by the Mississippi PSC. In recognition that Mississippi Power's long-term financial success is dependent upon how well it satisfies its customers' needs, PEP includes performance indicators that directly tie customer service indicators to Mississippi Power's allowed ROE. PEP measures Mississippi Power's performance on a 10-point scale as a weighted average of results in three areas: average customer price, as compared to prices of other regional utilities (weighted at 40%); service reliability, measured in percentage of time customers had electric service (40%); and 4 withcustomer satisfaction, measured in service datesa survey of Novemberresidential customers (20%). Typically, two PEP filings are made for each calendar year: the PEP projected filing in March of the current year and the PEP lookback filing in March of the subsequent year. The annual PEP projected filings utilize a historic test year adjusted for "known and measurable" changes and discounted cash flow and regression formulas to determine base ROE. The PEP lookback filing reflects the actual revenue requirement.
In June 2021 and NovemberJune 2022, the Mississippi PSC approved Mississippi Power's annual retail PEP filings, resulting in annual increases in revenues of approximately $16 million, or 1.8%, and $18 million, or 1.9%, respectively, is as follows:
 (in billions)
Project capital cost forecast$7.3
Net investment as of December 31, 2017(3.4)
Remaining estimate to complete$3.9
Note: Excludes financing costs capitalized through AFUDC and is net of payments received under the Guarantee Settlement Agreement and the Customer Refunds.
The Company estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.1 billion, of which $1.6 billion had been incurred through December 31, 2017.
As construction continues, challenges with management of contractors, subcontractors, and vendors, labor productivity and availability, fabrication, delivery, assembly, and installation of plant systems, structures, and components (some of which are based on new technology and have not yet operated in the global nuclear industry at this scale), or other issues could arise and change the projected schedule and estimated cost.
There have been technical and procedural challenges to the construction and licensing of Plant Vogtle Units 3 and 4 at the federal and state level and additional challenges may arise. Processes are in place that are designed to assure complianceeffective with the requirements specifiedfirst billing cycle of April 2021 and April 2022, respectively. On June 13, 2023, the Mississippi PSC approved Mississippi Power's annual retail PEP filing for 2023 indicating no change in retail rates.
Integrated Resource Plan
In 2020, the Westinghouse Design Control DocumentMississippi PSC issued an order requiring Mississippi Power to incorporate into its 2021 IRP a schedule of early or anticipated retirement of 950 MWs of fossil-steam generation by year-end 2027 to reduce the excess reserve margin Mississippi Power anticipated at that time. The order stated that Mississippi Power will be allowed to defer any retirement-related costs as regulatory assets for future recovery.
In 2021, the Mississippi PSC concluded its review of Mississippi Power's 2021 IRP. The 2021 IRP included a schedule to retire Plant Watson Unit 4 (268 MWs) and the combined constructionMississippi Power's 40% ownership interest in Plant Greene County Units 1 and operating licenses, including inspections by Southern Nuclear and the NRC that occur throughout construction. As a result of such compliance2 (103
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MWs each) in December 2023, 2025, and 2026, respectively, consistent with each unit's remaining useful life in the most recent approved depreciation studies. In addition, the schedule reflected the early retirement of Mississippi Power's 50% undivided ownership interest in Plant Daniel Units 1 and 2 (502 MWs) by the end of 2027. The Plant Greene County unit retirements require the completion by Alabama Power of transmission and system reliability improvements, as well as agreement by Alabama Power.
The remaining net book value of Plant Daniel Units 1 and 2 was approximately $489 million at December 31, 2023 and Mississippi Power is continuing to depreciate these units using the current approved rates. Mississippi Power expects to reclassify the net book value remaining at retirement to a regulatory asset to be amortized over a period to be determined by the Mississippi PSC in future proceedings, consistent with the 2020 order. The Plant Watson and Greene County units are expected to be fully depreciated upon retirement. See Note 3 under "Other Matters – Mississippi Power" for additional information on Plant Daniel Units 1 and 2.
In October 2023, Mississippi Power signed an affiliate PPA with Georgia Power Company 2017 Annual Report

processes, certain license amendment requests have been filedfor 750 MWs of capacity, which began January 1, 2024 and approved or are pending beforewill continue through December 2028. In order to fulfill this PPA and serve the NRC. Various designinterests of customers, Mississippi Power now expects electric generating units identified in its 2021 IRP to remain in service beyond the previously indicated dates. Mississippi Power is expected to file its next IRP in April 2024 in accordance with the rules and other licensing-based compliance matters, includingorders of the timely resolution of Inspections, Tests, Analyses, and Acceptance Criteria and the related approvals by the NRC, may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the project schedule that could result in increased costs.Mississippi PSC.
The ultimate outcome of these matters cannot be determined at this time.
Other MattersEnvironmental Compliance Overview Plan
AsIn accordance with a 2011 accounting order from the Mississippi PSC, Mississippi Power has the authority to defer in a regulatory asset for future recovery all plant retirement- or partial retirement-related costs resulting from environmental regulations.
In June 2021, April 2022, and April 2023, the Mississippi PSC approved Mississippi Power's annual ECO Plan filings, resulting in a decrease in revenues of December 31, 2017,approximately $9 million annually effective with the Company had borrowed $2.6 billion related to Plant Vogtle Units 3 and 4 costs throughfirst billing cycle of July 2021, an increase in revenues of approximately $1 million annually effective with the Loan Guarantee Agreementfirst billing cycle of May 2022, and a multi-advance credit facility among$3 million annual increase in revenues effective with the Company, the DOE, and the FFB, which provides for borrowingsfirst billing cycle of up to $3.46 billion, subjectMay 2023, respectively.
On February 12, 2024, Mississippi Power submitted its annual ECO Plan filing to the satisfactionMississippi PSC, which requested a $9 million annual increase in revenues. The ultimate outcome of certain conditions. On September 28, 2017, the DOE issued a conditional commitmentthis matter cannot be determined at this time.
Fuel Cost Recovery
Mississippi Power annually establishes, and is required to file for an adjustment to, the Company for up to approximately $1.67 billion in additional guaranteed loans under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extensionretail fuel cost recovery factor that is approved by the DOE. FinalMississippi PSC. The Mississippi PSC approved increases of $2 million and $43 million effective in February 2021 and 2022, respectively. In November 2022, Mississippi Power filed a request with the Mississippi PSC to increase retail fuel revenues by $25 million annually effective with the first billing cycle of February 2023 and an additional $25 million annually effective with the first billing cycle of June 2023. On January 10, 2023, the Mississippi PSC voted to defer approval of the filing. Mississippi Power is allowed to maintain current billing rates and issuancecontinue accruing its weighted-average cost of capital on any under or over fuel recovery balance. On February 6, 2024, the Mississippi PSC approved Mississippi Power's request to increase retail fuel revenues by $18 million annually effective with the first billing cycle of March 2024. The approved filing included the deferral of approximately $61 million of under recovered fuel costs as of October 2023, which is expected to be included in Mississippi Power's next fuel filing. Mississippi Power will continue to accrue its weighted-average cost of capital on any under or over fuel recovery balance.
At December 31, 2023, Mississippi Power had $50 million of deferred under recovered retail fuel clause revenues and $27 million of over recovered retail fuel clause revenues primarily associated with its fuel-hedging program on its balance sheet. At December 31, 2022, under recovered retail fuel costs of approximately $1 million were included in other customer accounts receivable on Mississippi Power's balance sheet. See Note 1 under "Fuel Costs" for additional information.
Mississippi Power has wholesale MRA and Market Based (MB) fuel cost recovery factors. Effective with the first billing cycles for January 2022, 2023, and 2024, annual revenues under the wholesale MRA fuel rate increased $11 million and $22 million and decreased $4 million, respectively. The wholesale MB fuel rate did not change materially in any period presented. At December 31, 2023 and 2022, wholesale fuel costs were over recovered $5 million and under recovered $6 million, respectively.
Mississippi Power's operating revenues are adjusted for differences in actual recoverable fuel cost and amounts billed in accordance with the currently approved cost recovery rate. Accordingly, changes in the billing factor should have no significant effect on Mississippi Power's revenues or net income but will affect operating cash flows.
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Ad Valorem Tax Adjustment
Mississippi Power annually establishes an ad valorem tax adjustment factor that is approved by the Mississippi PSC. Effective with the first billing cycle of May 2021, July 2022, and June 2023, the Mississippi PSC approved changes in annual revenues collected through the ad valorem tax adjustment factor resulting in a $28 million increase, a $5 million increase, and a $7 million decrease, respectively. The 2021 increase included approximately $19 million of ad valorem taxes previously recovered through PEP in accordance with a 2019 rate case settlement agreement.
System Restoration Rider
Mississippi Power carries insurance for the cost of certain types of damage to generation plants and general property. However, Mississippi Power is self-insured for the cost of storm, fire, and other uninsured casualty damage to its property, including transmission and distribution facilities. As permitted by the Mississippi PSC and the FERC, Mississippi Power accrues for the cost of such damage through an annual expense accrual which is credited to regulatory liability accounts for the retail and wholesale jurisdictions. The cost of repairing actual damage resulting from such events that individually exceed $50,000 is charged to the reserve. Every year, the Mississippi PSC, the MPUS, and Mississippi Power agree on SRR revenue level(s).
Mississippi Power's net retail SRR accrual, which includes carrying costs and previously included amortization of related excess deferred income tax benefits, was $11.7 million in 2023, $6.9 million in 2022, and $(1.8) million in 2021. At December 31, 2023 and 2022, the retail property damage reserve balance was $45 million and $37 million, respectively.
In 2021, the Mississippi PSC approved Mississippi Power's annual SRR filing, which requested an increase in retail revenues of approximately $9 million annually effective with the first billing cycle of March 2022. On April 4, 2023, the Mississippi PSC approved Mississippi Power's annual SRR filing, which indicated no change in retail rates. Mississippi Power's minimum annual SRR accrual was increased from $8.3 million to $11.7 million. In the event the expected annual charges exceed the annual accrual or the target balance has been met, Mississippi Power and the Mississippi PSC will determine the appropriate change to the annual accrual. Additionally, if PEP earnings are above a certain threshold, Mississippi Power has the ability to apply any required PEP refund as an additional accrual to the property damage reserve in lieu of customer refunds.
On February 1, 2024, Mississippi Power submitted its annual SRR filing to the Mississippi PSC, which indicated no change in retail rates. The filing includes a request to increase the minimum annual SRR accrual from $11.7 million to $12.6 million.
Reliability Reserve Accounting Order
In December 2022, the Mississippi PSC approved an accounting order authorizing Mississippi Power to create a reliability reserve for the purpose of deferring generation, transmission, and distribution reliability-related expenditures for use in a future year. Mississippi Power may make accruals to the reliability reserve each year after meeting with the MPUS and Mississippi PSC staff. Mississippi Power will provide annually, through its capital plan, energy delivery plan, or PEP filing, any amounts to be charged against the reliability reserve during the current year. During 2023 and 2022, Mississippi Power accrued $11 million and $25 million, respectively, to the reliability reserve. At December 31, 2023 and 2022, the reliability reserve balance was $36 million and $25 million, respectively.
Municipal and Rural Associations Tariff
Mississippi Power provides wholesale electric service to Cooperative Energy, East Mississippi Electric Power Association, and the City of Collins, all located in southeastern Mississippi, under a long-term, cost-based, FERC-regulated MRA tariff.
In 2017, Mississippi Power and Cooperative Energy executed, and the FERC accepted, a Shared Service Agreement (SSA), as part of the MRA tariff, under which Mississippi Power and Cooperative Energy share in providing electricity to the Cooperative Energy delivery points under the tariff. In August 2022, the FERC accepted an amended SSA between Mississippi Power and Cooperative Energy, effective July 1, 2022, under which Cooperative Energy will continue to decrease its use of Mississippi Power's generation services under the MRA tariff up to 2.5% annually through 2035. At December 31, 2023, Mississippi Power is serving approximately 390 MWs of Cooperative Energy's annual demand. Beginning in 2036, Cooperative Energy will provide 100% of its electricity requirements at the MRA delivery points under the tariff. Neither party has the option to cancel the amended SSA.
On October 27, 2023, the FERC approved a settlement agreement filed by Mississippi Power and Cooperative Energy on July 31, 2023 related to Mississippi Power's July 2022 request for a $23 million increase in annual wholesale base revenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and a refund to customers of approximately $6 million primarily related to the difference between the approved rates and interim rates.
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Southern Company Gas
Utility Regulation and Rate Design
The natural gas distribution utilities are subject to regulation and oversight by their respective state regulatory agencies. Rates charged to customers vary according to customer class (residential, commercial, or industrial) and rate jurisdiction. These agencies approve rates designed to provide the opportunity to generate revenues to recover all prudently-incurred costs, including a return on rate base sufficient to pay interest on debt and provide a reasonable ROE.
As a result of operating in a deregulated environment, Atlanta Gas Light earns revenue by charging rates to its customers based primarily on monthly fixed charges that are set by the Georgia PSC and adjusted periodically. The Marketers add these fixed charges when billing their respective customers. This mechanism, called a straight-fixed-variable rate design, minimizes the seasonality of Atlanta Gas Light's revenues since the monthly fixed charge is not volumetric or directly weather dependent.
With the exception of Atlanta Gas Light, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are largely a function of weather conditions and price levels for natural gas. Specifically, customer demand substantially increases during the Heating Season when natural gas is used for heating purposes. Southern Company Gas has various mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit exposure to weather changes within typical ranges in these utilities' respective service territories.
In addition to natural gas cost recovery mechanisms, other cost recovery mechanisms and regulatory riders, which vary by utility, allow recovery of certain costs, such as those related to infrastructure replacement programs as well as environmental remediation, energy efficiency plans, and bad debts. In traditional rate designs, utilities recover a significant portion of the fixed customer service and pipeline infrastructure costs based on assumed natural gas volumes used by customers. With the exception of Chattanooga Gas, the natural gas distribution utilities have decoupled regulatory mechanisms that Southern Company Gas believes encourage conservation by separating the recoverable amount of these fixed costs from the amounts of natural gas used by customers. See "Rate Proceedings" herein for additional loan guaranteesinformation. Also see "Infrastructure Replacement Programs and Capital Projects" herein for additional information regarding infrastructure replacement programs at certain of the natural gas distribution utilities.
The following table provides regulatory information for Southern Company Gas' natural gas distribution utilities:
Nicor GasAtlanta Gas LightVirginia Natural GasChattanooga Gas
Authorized ROE at December 31, 20239.51%10.25%9.70%9.80%
Weather normalization mechanisms(a)
üü
Decoupled, including straight-fixed-variable rates(b)
üüü
Regulatory infrastructure program rate(c)
üüüü
Bad debt rider(d)
üüü
Energy efficiency plan(e)
üü
Annual base rate adjustment mechanism(f)
üü
Year of last base rate case decision2023201920232018
(a)Designed to help stabilize operating results by allowing recovery of costs in the DOE cannot be assuredevent of unseasonal weather, but are not direct offsets to the potential impacts on earnings of weather and customer consumption.
(b)Allows for recovery of fixed customer service costs separately from assumed natural gas volumes used by customers and provides a benchmark level of revenue for recovery.
(c)See "Infrastructure Replacement Programs and Capital Projects" herein for additional information. Chattanooga Gas' pipeline replacement program costs are recovered through its annual base rate review mechanism.
(d)The recovery (refund) of bad debt expense over (under) an established benchmark expense. The gas portion of bad debt expense is recovered through purchased gas adjustment mechanisms. Nicor Gas also has a rider to recover the non-gas portion of bad debt expense.
(e)Recovery of costs associated with plans to achieve specified energy savings goals.
(f)Regulatory mechanism allowing annual adjustments to base rates up or down based on authorized ROE and/or ROE range.
Infrastructure Replacement Programs and Capital Projects
In addition to capital expenditures recovered through base rates by each of the natural gas distribution utilities, Nicor Gas and Virginia Natural Gas have separate rate riders that provide timely recovery of capital expenditures for specific infrastructure replacement programs and Atlanta Gas Light has a separate rate rider that provides for the timely recovery of capital expenditures for a specific reinforcement capital program. Total capital expenditures incurred during 2023 for all gas distribution operations were $1.6 billion.
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The following table and discussions provide updates on the infrastructure replacement programs and capital projects at the natural gas distribution utilities at December 31, 2023. These programs are risk-based and designed to update and replace cast iron, bare steel, and mid-vintage plastic materials or expand Southern Company Gas' distribution systems to improve reliability and meet operational flexibility and growth.
UtilityProgramRecoveryCapital Expenditures in 2023Capital Expenditures Since Project InceptionPipe
Installed Since
Project Inception
Scope of
Program
Program DurationLast
Year of Program
(in millions)(miles)(miles)(years)
Nicor Gas
Investing in Illinois Qualifying Infrastructure Plant(*)
Rider$365 $3,228 1,367 1,367 92023
Virginia Natural GasSAVERider75 486 567 695 132024
Atlanta Gas LightSystem Reinforcement RiderRider104 180 20 N/A32024
Chattanooga GasPipeline Replacement ProgramRate Base16 15 73 72027
Total$553 $3,910 1,969 2,135 
(*)Included replacement of pipes, compressors, and transmission mains along with other improvements such as new meters. This program ended November 30, 2023 with all expenditures placed in service. Recovery of program costs is described under "Nicor Gas" herein.
Nicor Gas
Illinois legislation allows Nicor Gas to provide more widespread safety and reliability enhancements to its distribution system through 2023 and stipulates that rate increases to customers as a result of any infrastructure investments shall not exceed a cumulative annual average of 4.0% or, in any given year, 5.5% of base rate revenues. In 2014, the Illinois Commission approved the nine-year regulatory infrastructure program, Investing in Illinois, which concluded in 2023 and is subject to annual review, as discussed further below. In accordance with orders from the Illinois Commission, Nicor Gas recovers program costs incurred through a separate rider and base rates. See "Rate Proceedings – Nicor Gas" herein for additional information.
On June 15, 2023, the Illinois Commission concluded its review of the Qualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the second quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an $8 million reduction to revenues and $30 million in estimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a rehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
The following table provides a summary of QIP capital investments during the nine-year program:
Year Status of QIP Annual Review ProceedingCapital InvestmentsDisallowedMonth of Disallowance
(in millions)
2015 – 2018Complete$1,246 $— 
2019
Complete(a)
415 32 June 2023
2020Filed March 2021402 (b)
2021Filed March 2022392 (b)
2022Filed March 2023408 (b)(a)(c)November 2023
2023To be filed by March 20, 2024365 (b)25 (a)(c)November 2023
$3,228 $63 
(a)Appealed to the Illinois Appellate Court.
(b)Capital investments are subject to the negotiation of definitive agreements, completion of due diligence byrequired QIP annual review proceeding; years 2020 through 2022 are pending with the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions.Illinois Commission.
(c)Disallowed in Nicor Gas' 2023 general base rate case proceeding. See Note 6 under "DOE Loan Guarantee Borrowings""Rate Proceedings – Nicor Gas" herein for additional information including applicable covenants, eventsregarding the Illinois Commission's disallowance of default, mandatory prepayment events, and conditionscertain capital investments.
Any further cost disallowances by the Illinois Commission in the pending cases could be material to borrowing.
the financial statements of Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time.
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Virginia Natural Gas
The SAVE program, an accelerated infrastructure replacement program, allows Virginia Natural Gas to continue replacing aging pipeline infrastructure through 2024. The program includes authorized annual investments of $60 million in 2021 and $70 million in each year from 2022 through 2024, with a total potential variance of up to $5 million allowed for the program, for a maximum total investment over the six-year term (2019 through 2024) of $365 million.
On February 9, 2024, Virginia Natural Gas filed with the Virginia Commission a request to extend the existing SAVE program through 2029. The request includes investments of $70 million in each year from 2025 through 2029, with a potential variance of up to $5 million allowed for the program, for a maximum total investment over the five-year extension (2025 through 2029) of $355 million. Virginia Natural Gas expects the Virginia Commission to issue a final order on this matter in the second quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
The SAVE program is subject to annual review by the Virginia Commission. In accordance with the base rate case approved by the Virginia Commission in 2023, Virginia Natural Gas is recovering program costs incurred prior to January 1, 2023 through base rates. Program costs incurred subsequent to January 1, 2023 are currently being recovered through a separate rider and are subject to future base rate case proceedings. See "Rate Proceedings – Virginia Natural Gas" herein for additional information.
Atlanta Gas Light
In 2019, the Georgia PSC approved the continuation of GRAM as part of Atlanta Gas Light's 2019 rate case order. Various infrastructure programs previously authorized by the Georgia PSC, including the Integrated Vintage Plastic Replacement Program to replace aging plastic pipe and the Integrated System Reinforcement Program to upgrade Atlanta Gas Light's distribution system and LNG facilities in Georgia, continue under GRAM and the recovery of and return on the infrastructure program investments are included in annual base rate adjustments. The amounts to be recovered through rates related to allowed, but not incurred, costs have been quantified as an unrecognized ratemaking amount that is not reflected on the balance sheets. These allowed costs are primarily the equity return on the capital investment under the infrastructure programs in place prior to GRAM and are being recovered through GRAM and base rates until the earlier of the full recovery of such amounts or December 31, 2025. The under recovered balance at December 31, 2023 was $44 million, including $23 million of unrecognized equity return, and is expected to be recovered by December 31, 2025. The Georgia PSC reviews Atlanta Gas Light's performance annually under GRAM. See "Unrecognized Ratemaking Amounts" herein for additional information.
Atlanta Gas Light and the staff of the Georgia PSC previously agreed to a variation of the Integrated Customer Growth Program to extend pipeline facilities to serve customers in areas without pipeline access and create new economic development opportunities in Georgia. A separate tariff provides recovery of up to $15 million annually for strategic economic development projects approved by the Georgia PSC.
See "Rate Proceedings – Atlanta Gas Light" herein for additional information regarding the Georgia PSC's 2021 approval of Atlanta Gas Light's GRAM filing and Integrated Capacity and Delivery Plan. The Georgia PSC also approved a new System Reinforcement Rider for authorized large pressure improvement and system reliability projects, which is expected to recover related capital investments totaling $286 million for the years 2022 through 2024, of which $104 million and $76 million was incurred in 2023 and 2022, respectively.
Chattanooga Gas
In 2021, the Tennessee Public Utilities Commission approved Chattanooga Gas' pipeline replacement program to replace approximately 73 miles of distribution main over a seven-year period. The estimated total cost of the program is $118 million, which will be recovered through Chattanooga Gas' annual base rate review mechanism.
Natural Gas Cost Recovery
With the exception of Atlanta Gas Light, the natural gas distribution utilities are authorized by the relevant regulatory agencies in the states in which they serve to use natural gas cost recovery mechanisms that adjust rates to reflect changes in the wholesale cost of natural gas and ensure recovery of all costs prudently incurred in purchasing natural gas for customers. The natural gas distribution utilities defer or accrue the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred natural gas costs are reflected as regulatory assets and accrued natural gas costs are reflected as regulatory liabilities. Natural gas costs generally do not have a significant effect on Southern Company's or Southern Company Gas' net income, but could have a significant effect on cash flows. Since Atlanta Gas Light does not sell natural gas directly to its end-use customers, it does not utilize a traditional natural gas cost recovery mechanism. However, Atlanta Gas Light does maintain natural gas inventory for the Marketers in Georgia and recovers the cost through recovery mechanisms approved by the Georgia PSC. At December 31, 2023, the over recovered balance was $214 million, which was included in
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natural gas cost over recovery on Southern Company's and Southern Company Gas' balance sheets. At December 31, 2022, the under recovered balance was $108 million, which was included in natural gas cost under recovery on Southern Company's and Southern Company Gas' balance sheets.
Rate Proceedings
Nicor Gas
In 2021, the Illinois Commission approved a $240 million annual base rate increase, which became effective November 24, 2021. The base rate increase included $94 million related to the recovery of program costs under the Investing in Illinois program and was based on a ROE of 9.75% and an equity ratio of 54.5%.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and an equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to be completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the fourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be postponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. See "Infrastructure Replacement Programs and Capital Projects – Nicor Gas" herein for additional information regarding the Illinois Commission's disallowance of certain capital investments. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined in the Illinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to the Illinois Commission's rate case ruling. The ultimate outcome of this matter cannot be determined at this time.
Atlanta Gas Light
The Georgia PSC evaluates Atlanta Gas Light's earnings against a ROE range of 10.05% to 10.45%, with disposition of any earnings above 10.45% to be determined by the Georgia PSC. Additionally, the Georgia PSC allows inclusion in base rates of the recovery of and return on the infrastructure program investments, including, but not limited to, GRAM adjustments. GRAM filing rate adjustments are based on an authorized ROE of 10.25%. GRAM adjustments for 2021 could not exceed 5% of 2020 base rates. The 5% limitation does not set a precedent in any future rate proceedings by Atlanta Gas Light.
In April 2021, Atlanta Gas Light filed its Integrated Capacity and Delivery Plan (i-CDP) with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2022 through 2031), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected capital investments totaling approximately $0.5 billion to $0.6 billion annually.
In November 2021, the Georgia PSC approved a stipulation agreement between Atlanta Gas Light and the staff of the Georgia PSC, under which, for the years 2022 through 2024, Atlanta Gas Light will incrementally reduce its combined GRAM and System Reinforcement Rider request by 10% through Atlanta Gas Light's GRAM mechanism, which resulted in a reduction of $5 million for 2022, $7 million for 2023, and $9 million for 2024. The stipulation agreement also provided for $1.7 billion of total capital investment for the years 2022 through 2024.
In November 2021, December 2022, and December 2023, the Georgia PSC approved Atlanta Gas Light's annual GRAM filings, which resulted in an annual rate increase of $43 million effective January 1, 2022, an annual rate increase of $53 million effective January 1, 2023, and an annual rate increase of $53 million effective January 1, 2024, respectively.
On February 1, 2024, Atlanta Gas Light filed its triennial i-CDP with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2025 through 2034), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected capital investments totaling approximately
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$0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order on this matter in the third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Virginia Natural Gas
In 2021, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' 2020 general rate case filing, which allowed for a $43 million increase in annual base rate revenues, including $14 million related to the recovery of investments under the SAVE program, based on a ROE of 9.5% and an equity ratio of 51.9%. Interim rates became effective as of November 1, 2020, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $50 million. Refunds to customers related to the difference between the approved rates effective October 1, 2021 and the interim rates were completed during the fourth quarter 2021.
On August 28, 2023, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for a $48 million increase in annual base rate revenues based on a ROE of 9.70% and an equity ratio of 49.06%. Interim rates became effective as of January 1, 2023, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $69 million. Refunds to customers related to the difference between the approved rates effective September 1, 2023 and the interim rates were completed during the fourth quarter 2023.
Unrecognized Ratemaking Amounts
The following table illustrates Southern Company Gas' authorized ratemaking amounts that are not recognized on its balance sheets. These amounts are primarily comprised of an allowed equity rate of return on assets associated with certain regulatory infrastructure programs. These amounts will be recognized as revenues in Southern Company Gas' financial statements in the periods they are billable to customers, the majority of which will be recovered by 2025.
December 31, 2023December 31, 2022
(in millions)
Atlanta Gas Light$23 $35 
Virginia Natural Gas10 10 
Chattanooga Gas7 
Nicor Gas3 
Total$43 $50 
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3. CONTINGENCIES, COMMITMENTS, AND GUARANTEES
General Litigation Matters
The Registrants are involved in various matters being litigated and regulatory matters. The ultimate outcome of such pending or potential litigation or regulatory matters against each Registrant and any subsidiaries cannot be determined at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on such Registrant's financial statements.
The Registrants intend to dispute the allegations raised in and vigorously defend against the pending legal challenges discussed below; however, the ultimate outcome of these matters cannot be determined at this time.
Southern Company and Mississippi Power
In 2010, the DOE, through a cooperative agreement with SCS, agreed to fund $270 million of the Kemper County energy facility through the grants awarded to the project by the DOE under the Clean Coal Power Initiative Round 2. In 2016, additional DOE grants in the amount of $137 million were awarded to the Kemper County energy facility. In 2018, Mississippi Power filed with the DOE its request for property closeout certification under the contract related to the $387 million of total grants received. In 2020, Mississippi Power and Southern Company executed an agreement with the DOE completing Mississippi Power's request, which enabled Mississippi Power to proceed with full dismantlement of the abandoned gasifier-related assets and site restoration activities. In connection with the DOE closeout discussions, in 2019, the Civil Division of the Department of Justice informed Southern Company and Mississippi Power of a civil investigation related to the DOE grants. On August 4, 2023, the U.S. District Court for the Northern District of Georgia unsealed a civil action in which defendants Southern Company, SCS, and Mississippi Power are alleged to have violated certain provisions of the False Claims Act by fraudulently inducing the DOE to disburse funds pursuant to the grants. The federal government declined to intervene in the action. On October 30, 2023, the plaintiff, a former SCS employee, filed an amended complaint, again alleging certain violations of the False Claims Act. The plaintiff seeks to recover all damages incurred personally and on behalf of the government caused by the defendants' alleged violations, as well as treble damages and attorneys' fees, among other relief. The ultimate outcome of this matter cannot be determined at this time; however, an adverse outcome could have a material impact on Southern Company's and Mississippi Power's financial statements.
Alabama Power
In September 2022, Mobile Baykeeper filed a citizen suit in the U.S. District Court for the Southern District of Alabama alleging that Alabama Power's plan to close the Plant Barry ash pond utilizing a closure-in-place methodology violates the Resource Conservation and Recovery Act (RCRA) and regulations governing CCR. Among other relief requested, Mobile Baykeeper sought a declaratory judgment that the RCRA and regulations governing CCR were being violated, preliminary and injunctive relief to prevent implementation of Alabama Power's closure plan and the development of a closure plan that satisfies regulations governing CCR requirements. In December 2022, Alabama Power filed a motion to dismiss the case. On January 4, 2024, the lawsuit was dismissed without prejudice by the U.S. District Court judge. On February 1, 2024, the plaintiff filed a motion to reconsider.
On January 31, 2023, the EPA issued a Notice of Potential Violations associated with Alabama Power's plan to close the Plant Barry ash pond. Alabama Power has affirmed to the EPA its position that it is in compliance with CCR requirements. The ultimate outcome of this matter cannot be determined at this time but could have a material impact on Alabama Power's ARO estimates and cash flows.
See Note 6 for a discussion of Alabama Power's ARO liabilities.
Georgia Power
In July 2020, a group of individual plaintiffs filed a complaint, which was amended in December 2022, in the Superior Court of Fulton County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer has impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages, a medical monitoring fund, and injunctive relief. In December 2022, the Superior Court of Fulton County, Georgia granted Georgia Power's motion to transfer the case to the Superior Court of Monroe County, Georgia. On May 9, 2023, the Superior Court of Monroe County, Georgia denied Georgia Power's motion to dismiss the case for lack of subject matter jurisdiction. On July 27, 2023, the Superior Court of Monroe County, Georgia denied the remaining motions to dismiss certain claims and plaintiffs that Georgia Power filed at the outset of the case.
In October 2021, February 2022, and January 2023, a total of eight additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that releases from Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs sought an unspecified amount of monetary damages
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including punitive damages. After Georgia Power removed these cases to the U.S. District Court for the Middle District of Georgia, the plaintiffs voluntarily dismissed their complaints without prejudice in November 2022 and January 2023. On May 12, 2023, the plaintiffs in the cases originally filed in October 2021, February 2022, and January 2023 refiled their eight complaints in the Superior Court of Monroe County, Georgia. Also on May 12, 2023, a new complaint was filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries. The plaintiff seeks an unspecified amount of monetary damages, including punitive damages. On May 18, 2023, Georgia Power removed all of these cases to the U.S. District Court for the Middle District of Georgia. The plaintiffs are requesting the court remand the cases back to the Superior Court of Monroe County, Georgia.
The amount of possible loss, if any, from these matters cannot be estimated at this time.
Mississippi Power
In 2018, Ray C. Turnage and 10 other individual plaintiffs filed a putative class action complaint against Mississippi Power and the three then-serving members of the Mississippi PSC in the U.S. District Court for the Southern District of Mississippi, which was amended in March 2019 to include four additional plaintiffs. Mississippi Power received Mississippi PSC approval in 2013 to charge a mirror CWIP rate premised upon including in its rate base pre-construction and construction costs for the Kemper IGCC prior to placing the Kemper IGCC into service. The Mississippi Supreme Court reversed that approval and ordered Mississippi Power to refund the amounts paid by customers under the previously-approved mirror CWIP rate. The plaintiffs allege that the initial approval process, and the amount approved, were improper and make claims for gross negligence, reckless conduct, and intentional wrongdoing. They also allege that Mississippi Power underpaid customers by up to $23.5 million in the refund process by applying an incorrect interest rate. The plaintiffs seek to recover, on behalf of themselves and their putative class, actual damages, punitive damages, pre-judgment interest, post-judgment interest, attorney's fees, and costs. The district court dismissed the amended complaint; however, in March 2020, the plaintiffs filed a motion seeking to name the new members of the Mississippi PSC, the Mississippi Development Authority, and Southern Company as additional defendants and add a cause of action against all defendants based on a dormant commerce clause theory under the U.S. Constitution. In July 2020, the plaintiffs filed a motion for leave to file a third amended complaint, which included the same federal claims as the proposed second amended complaint, as well as several additional state law claims based on the allegation that Mississippi Power failed to disclose the annual percentage rate of interest applicable to refunds. In November 2020, the district court denied each of the plaintiffs' pending motions and entered final judgment in favor of Mississippi Power. In January 2021, the district court denied further motions by the plaintiffs to vacate the judgment and to file a revised second amended complaint. In February 2021, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fifth Circuit. In March 2022, the U.S. Court of Appeals for the Fifth Circuit issued an opinion affirming the dismissal of the claims against the Mississippi PSC defendants but reversing the dismissal of the claims against Mississippi Power. In May 2022, the U.S. Court of Appeals for the Fifth Circuit denied a petition by Mississippi Power for a rehearing en banc and remanded the case to the U.S. District Court for the Southern District of Mississippi for further proceedings. In June 2022, Mississippi Power filed with the trial court a motion to dismiss the complaint with prejudice, which was granted on March 15, 2023. On March 28, 2023, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fifth Circuit. On December 14, 2023, the U.S. Court of Appeals for the Fifth Circuit affirmed the district court's order dismissing the plaintiffs' complaint against Mississippi Power. On December 28, 2023, the plaintiffs filed a petition for panel rehearing, which was denied on January 10, 2024. The plaintiffs have until April 9, 2024 to file a petition for writ of certiorari with the U.S. Supreme Court. The ultimate outcome of this matter cannot be determined at this time.
Southern Power
In July 2021, Southern Power and certain of its subsidiaries filed an arbitration demand with the American Arbitration Association against First Solar Electric, LLC (First Solar) for defective design of actuators on trackers and inverters installed by First Solar under the engineering, procurement, and construction agreements associated with five solar projects owned by Southern Power and partners and managed by Southern Power. In February 2023, arbitration hearings concluded. In July 2023, an interim award of approximately $36 million was entered in favor of Southern Power and was subsequently received in September 2023. The interim award included $18 million representing recovery of losses associated with replacement costs, penalty payments, and lost revenues previously incurred. This recovery is reflected in Southern Power's 2023 statement of income as an $11 million reduction to other operations and maintenance expense and a $7 million increase in other revenues, with $6 million allocated through noncontrolling interests to Southern Power's partners. The remaining $18 million in award proceeds received in excess of the losses incurred is recognized on the balance sheet at December 31, 2023 as restricted cash and a liability to fund future replacement costs. In November 2023, the final award was issued and Southern Power filed for confirmation of the final award in the Delaware Court of Chancery. In December 2023, First Solar filed a motion to dismiss the confirmation and, in February 2024, filed a petition to vacate the arbitration award in the Supreme Court of New York County, New York. The ultimate outcome of this matter cannot be determined at this time.
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Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and the natural gas distribution utilities conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in the financial statements. A liability for environmental remediation costs is recognized only when a loss is determined to be probable and reasonably estimable and is reduced as expenditures are incurred. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia have each received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. Any difference between the liabilities accrued and costs recovered through rates is deferred as a regulatory asset or liability. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies.
Georgia Power has been designated or identified as a potentially responsible party at sites governed by the Georgia Hazardous Site Response Act and/or by the federal Comprehensive Environmental Response, Compensation, and Liability Act, and assessment and potential cleanup of such sites is expected. For 2023, 2022, and 2021, Georgia Power recovered approximately $5 million, $12 million, and $12 million, respectively, through the ECCR tariff for environmental remediation.
Southern Company Gas is subject to environmental remediation liabilities associated with 40 former manufactured gas plant sites in four different states. Southern Company Gas' accrued environmental remediation liability at December 31, 2023 and 2022 was based on the estimated cost of environmental investigation and remediation associated with these sites.
At December 31, 2023 and 2022, the environmental remediation liability and the balance of under recovered environmental remediation costs were reflected in the balance sheets of Southern Company, Georgia Power, and Southern Company Gas as shown in the table below. Alabama Power and Mississippi Power did not have environmental remediation liabilities at December 31, 2023 or 2022.
Southern CompanyGeorgia
Power
Southern Company Gas
(in millions)
December 31, 2023:
Environmental remediation liability:
Other current liabilities$44 $14 $30 
Accrued environmental remediation192 — 192 
Under recovered environmental remediation costs:
Other regulatory assets, current$45 $$40 
Other regulatory assets, deferred210 15 195 
December 31, 2022:
Environmental remediation liability:
Other current liabilities$65 $15 $49 
Accrued environmental remediation207 — 207 
Under recovered environmental remediation costs:
Other regulatory assets, current$59 $$54 
Other regulatory assets, deferred235 20 215 
The ultimate outcome of these matters cannot be determined at this time; however, as a result of the regulatory treatment for environmental remediation expenses described above, the final disposition of these matters is not expected to have a material impact on the financial statements of the applicable Registrants.
Nuclear Fuel Disposal Costs
Acting through the DOE and pursuant to the Nuclear Waste Policy Act of 1982, the U.S. government entered into contracts with Alabama Power and Georgia Power that required the DOE to take title to and dispose of spent nuclear fuel generated at Plants Farley, Hatch, and Vogtle Units 1 and 2 beginning no later than January 31, 1998. The DOE has yet to commence performance of
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its contractual and statutory obligation to dispose of spent nuclear fuel. Consequently, Alabama Power and Georgia Power pursued and continue to pursue legal remedies against the U.S. government for its partial breach of contract.
In 2014, Alabama Power and Georgia Power filed their third round of lawsuits against the U.S. government in the Court of Federal Claims, seeking damages for the costs of continuing to store spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 for the period from January 1, 2011 through December 31, 2013. The damage period was subsequently extended to December 31, 2014. In 2019, the Court of Federal Claims granted Alabama Power's and Georgia Power's motion for summary judgment on damages not disputed by the U.S. government, awarding those undisputed damages to Alabama Power and Georgia Power. However, those undisputed damages are not collectible until the court enters final judgment on the remaining damages.
In 2017, Alabama Power and Georgia Power filed their fourth round of lawsuits against the U.S. government in the Court of Federal Claims, seeking damages for the costs of continuing to store spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 for the period from January 1, 2015 through December 31, 2017. In 2020, Alabama Power and Georgia Power filed amended complaints in those fourth-round lawsuits adding damages incurred from January 1, 2018 to December 31, 2019 to the claim period.
The outstanding claims for the period January 1, 2011 through December 31, 2019 total $106 million and $128 million for Alabama Power and Georgia Power (based on its ownership interests), respectively. Damages will continue to accumulate until the issue is resolved, the U.S. government disposes of Alabama Power's and Georgia Power's spent nuclear fuel pursuant to its contractual obligations, or alternative storage is otherwise provided. No amounts have been recognized in the financial statements as of December 31, 2023 for any potential recoveries from the pending lawsuits.
The final outcome of these matters cannot be determined at this time. However, Alabama Power and Georgia Power expect to credit any recoveries for the benefit of customers in accordance with direction from their respective PSC; therefore, no material impact on Southern Company's, Alabama Power's, or Georgia Power's net income is expected.
On-site dry spent fuel storage facilities are operational at all three plants and can be expanded to accommodate spent fuel through the expected life of each plant.
Nuclear Insurance
Under the Price-Anderson Amendments Act (Act), Alabama Power and Georgia Power maintain agreements of indemnity with the NRC that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at the companies' nuclear power plants. The Act provides funds up to $16.2 billion for public liability claims that could arise from a single nuclear incident. Each nuclear plant is insured against this liability to a maximum of $450 million by American Nuclear Insurers (ANI), with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. A company could be assessed up to $166 million per incident for each licensed reactor it operates but not more than an aggregate of $25 million per incident to be paid in a calendar year for each reactor. Such maximum assessment, excluding any applicable state premium taxes, for Alabama Power and Georgia Power, based on its ownership and buyback interests in all licensed reactors, is $332 million and $473 million, respectively, per incident, but not more than an aggregate of $49 million and $71 million, respectively, to be paid for each incident in any one year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years. The next scheduled adjustment is due no later than November 1, 2028. See Note 5 under "Joint Ownership Agreements" for additional information on joint ownership agreements.
Alabama Power and Georgia Power are members of Nuclear Electric Insurance Limited (NEIL), a mutual insurer established to provide property damage insurance in an amount up to $1.5 billion for members' operating nuclear generating facilities. Additionally, both companies have NEIL policies that currently provide decontamination, excess property insurance, and premature decommissioning coverage up to $1.25 billion for nuclear losses and policies providing coverage up to $750 million for non-nuclear losses in excess of the $1.5 billion primary coverage.
NEIL also covers the additional costs that would be incurred in obtaining replacement power during a prolonged accidental outage at a member's nuclear plant. Members can purchase this coverage, subject to a deductible waiting period of up to 26 weeks, with a maximum per occurrence per unit limit of $490 million. After the deductible period, weekly indemnity payments would be received until either the unit is operational or until the limit is exhausted. Alabama Power and Georgia Power each purchase limits based on the projected full cost of replacement power, subject to ownership limitations, and have each elected a 12-week deductible waiting period for each nuclear plant.
A builders' risk property insurance policy has been purchased from NEIL for the construction of Plant Vogtle Unit 4. JOINT OWNERSHIP AGREEMENTSThis policy provides the Vogtle Owners up to $2.75 billion for accidental property damage occurring during construction.
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Under each of the NEIL policies, members are subject to assessments each year if losses exceed the accumulated funds available to the insurer. The maximum annual assessments for Alabama Power and Georgia Power as of December 31, 2023 under the NEIL policies would be $54 million and $89 million, respectively.
Claims resulting from terrorist acts and cyber events are covered under both the ANI and NEIL policies (subject to normal policy limits). The maximum aggregate that NEIL will pay for all claims resulting from terrorist acts and cyber events in any 12-month period is $3.2 billion each, plus such additional amounts NEIL can recover through reinsurance, indemnity, or other sources.
For all on-site property damage insurance policies for commercial nuclear power plants, the NRC requires that the proceeds of such policies shall be dedicated first for the sole purpose of placing the reactor in a safe and stable condition after an accident. Any remaining proceeds are to be applied next toward the costs of decontamination and debris removal operations ordered by the NRC, and any further remaining proceeds are to be paid either to the applicable company or to its debt trustees as may be appropriate under the policies and applicable trust indentures. In the event of a loss, the amount of insurance available might not be adequate to cover property damage and other expenses incurred. Uninsured losses and other expenses, to the extent not recovered from customers, would be borne by Alabama Power or Georgia Power, as applicable, and could have a material effect on Southern Company's, Alabama Power's, and Georgia Power's financial condition and results of operations.
All retrospective assessments, whether generated for liability, property, or replacement power, may be subject to applicable state premium taxes.
Other Matters
Traditional Electric Operating Companies
In April 2019, Bellsouth Telecommunications d/b/a AT&T Alabama (AT&T) filed a complaint against Alabama Power with the FCC alleging that the pole rental rate AT&T is required to pay pursuant to the parties' joint use agreement is unjust and unreasonable under federal law. The complaint sought a new rate and approximately $87 million in refunds of alleged overpayments for the preceding six years. In August 2019, the FCC stayed the case in favor of arbitration, which AT&T has not pursued. The joint use agreement remains in effect. The ultimate outcome of this matter cannot be determined at this time, but an adverse outcome could have a material impact on the financial statements of Southern Company and Alabama Power. Georgia Power own equally alland Mississippi Power have joint use agreements with other AT&T affiliates.
Mississippi Power
Kemper County Energy Facility
In 2021, 2022, and 2023, Mississippi Power recorded charges to income associated with abandonment and related closure costs and ongoing period costs, net of salvage proceeds, for the mine and gasifier-related assets at the Kemper County energy facility. These charges, including related tax impacts, totaled $11 million pre-tax ($8 million after tax) in 2021, $15 million pre-tax ($12 million after tax) in 2022, and $17 million pre-tax ($12 million after tax) in 2023. The pre-tax charges are included in other operations and maintenance expenses on the statements of income.
Dismantlement of the outstanding capital stockabandoned gasifier-related assets and site restoration activities are expected to be completed by 2026. Additional pre-tax period costs associated with dismantlement and site restoration activities, including related costs for compliance and safety, ARO accretion, and property taxes, net of SEGCO, whichsalvage, are estimated to total approximately $15 million annually through 2025.
Mississippi Power owns the lignite mine located around the Kemper County energy facility site. As a result of the abandonment of the Kemper IGCC, final mine reclamation began in 2018 and was substantially completed in 2020, with monitoring expected to continue through 2028.
As the mining permit holder, Liberty Fuels Company, LLC, a wholly-owned subsidiary of The North American Coal Corporation, has a legal obligation to perform mine reclamation and Mississippi Power has a contractual obligation to fund all reclamation activities. See Note 6 for additional information.
See "General Litigation Matters –Southern Company and Mississippi Power" herein for information regarding litigation associated with the Kemper County energy facility.
Plant Daniel
In conjunction with Southern Company's 2019 sale of Gulf Power, NextEra Energy held back $75 million of the purchase price pending Mississippi Power and NextEra Energy negotiating a mutually acceptable revised operating agreement for Plant Daniel. In July 2022, the co-owners executed a revised operating agreement and Southern Company subsequently received the remaining $75 million of the purchase price. The dispatch procedures in the revised operating agreement for the two jointly-owned coal units
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at Plant Daniel resulted in Mississippi Power designating one of the two units as primary and the other as secondary in lieu of each company separately owning 100% of a single generating unit. Mississippi Power did not exercise an option to purchase its co-owner's ownership interest for $1 on January 15, 2024. The revised operating agreement did not have a material impact on Mississippi Power's financial statements. See Note 2 under "Mississippi Power – Integrated Resource Plan" for additional information on Plant Daniel.
Commitments
To supply a portion of the fuel requirements of the Southern Company system's electric generating units withplants, the Southern Company system has entered into various long-term commitments not recognized on the balance sheets for the procurement and delivery of fossil fuel and, for Alabama Power and Georgia Power, nuclear fuel. The majority of the Registrants' fuel expense for the periods presented was purchased under long-term commitments. Each Registrant expects that a total rated capacity of 1,020 MWs, as well as associated transmission facilities. SEGCO uses natural gas as the primary fuel source for 1,000 MWssubstantial amount of its generating capacity.future fuel needs will continue to be purchased under long-term commitments.
Georgia Power has commitments, in the form of capacity purchases, regarding a portion of a 5% interest in the original cost of Plant Vogtle Units 1 and 2 owned by MEAG Power that are in effect until the later of the retirement of the plant or the latest stated maturity date of MEAG Power's bonds issued to finance such ownership interest. The payments for capacity are required whether or not any capacity is available. Portions of the capacity payments made to MEAG Power for its Plant Vogtle Units 1 and 2 investment relate to costs in excess of Georgia Power's allowed investment for ratemaking purposes. The present value of these units is sold equally toportions at the Company and Alabama Power under a power contract. The Company and Alabama Power make payments sufficient to provide fortime of the operating expenses, taxes, interest expense, and an ROE. The Company's sharedisallowance was written off. Generally, the cost of purchased power totaled $78 million in 2017, $57 million in 2016, and $78 million in 2015 andsuch capacity is included in purchased power affiliatesin Southern Company's statements of income and in purchased power, non-affiliates in Georgia Power's statements of income. Georgia Power's capacity payments related to this commitment totaled $3 million, $4 million, and $6 million in 2023, 2022, and 2021, respectively. At December 31, 2023, Georgia Power's estimated long-term obligations related to this commitment totaled $39 million, consisting of $4 million annually for 2024 and 2025, $2 million annually for 2026 through 2028, and $25 million thereafter.
See Note 9 for information regarding PPAs accounted for as leases.
Southern Company Gas has commitments for pipeline charges, storage capacity, and gas supply, including charges recoverable through natural gas cost recovery mechanisms or, alternatively, billed to marketers selling retail natural gas. Gas supply commitments include amounts for gas commodity purchases associated with Nicor Gas and SouthStar of 38 million mmBtu at floating gas prices calculated using forward natural gas prices at December 31, 2023 and valued at $98 million. Southern Company Gas provides guarantees to certain gas suppliers for certain of its subsidiaries in support of payment obligations. Southern Company Gas' expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets at December 31, 2023 were as follows:
Pipeline Charges, Storage Capacity, and Gas Supply
(in millions)
2024$587 
2025432 
2026231 
2027148 
2028103 
Thereafter785 
Total$2,286 
Guarantees
SCS may enter into various types of wholesale energy and natural gas contracts acting as an agent for the traditional electric operating companies and Southern Power. Under these agreements, each of the traditional electric operating companies and Southern Power may be jointly and severally liable. Accordingly, Southern Company has entered into keep-well agreements with each of the traditional electric operating companies to ensure they will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of Southern Power as a contracting party under these agreements.
Alabama Power has guaranteed a $100 million principal amount long-term bank loan SEGCO entered into in 2018 and subsequently extended and amended. Georgia Power has agreed to reimburse Alabama Power for the portion of such obligation corresponding to Georgia Power's proportionate ownership of SEGCO's stock if Alabama Power is called upon to make such payment under its guarantee. At December 31, 2023, the capitalization of SEGCO consisted of $69 million of equity and $100
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million of long-term debt that matures in November 2024, on which the annual interest requirement is derived from a variable rate index. SEGCO had no short-term debt outstanding at December 31, 2023. See Note 7 under "SEGCO" for additional information.
As discussed in Note 9, Alabama Power and Georgia Power have entered into certain residual value guarantees related to railcar leases.
4. REVENUE FROM CONTRACTS WITH CUSTOMERS
The Registrants generate revenues from a variety of sources, some of which are not accounted for as revenue from contracts with customers, such as leases, derivatives, and certain cost recovery mechanisms. See Note 1 under "Revenues" for additional information on the revenue policies of the Registrants. See Notes 9 and 14 for additional information on revenue accounted for under lease and derivative accounting guidance, respectively.
The following table disaggregates revenue from contracts with customers for the periods presented:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Operating revenues
Retail electric revenues
Residential$7,309 $2,904 $4,105 $300 $ $ 
Commercial5,860 1,928 3,624 308   
Industrial3,613 1,721 1,558 334   
Other112 12 91 9   
Total retail electric revenues16,894 6,565 9,378 951   
Natural gas distribution revenues
Residential1,981     1,981 
Commercial505     505 
Transportation1,184     1,184 
Industrial45     45 
Other324     324 
Total natural gas distribution revenues4,039     4,039 
Wholesale electric revenues
PPA energy revenues1,107 234 87 20 790  
PPA capacity revenues624 156 51 45 376  
Non-PPA revenues250 65 35 407 409  
Total wholesale electric revenues1,981 455 173 472 1,575  
Other natural gas revenues
Gas marketing services528     528 
Other natural gas revenues31     31 
Total natural gas revenues559     559 
Other revenues1,355 213 578 39 55  
Total revenue from contracts with customers24,828 7,233 10,129 1,462 1,630 4,598 
Other revenue sources(a)
425 (183)(11)12 559 104 
Total operating revenues$25,253 $7,050 $10,118 $1,474 $2,189 $4,702 
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Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2022
Operating revenues
Retail electric revenues
Residential$6,604 $2,638 $3,664 $302 $— $— 
Commercial5,369 1,685 3,385 299 — — 
Industrial3,764 1,507 1,921 336 — — 
Other102 14 79 — — 
Total retail electric revenues15,839 5,844 9,049 946 — — 
Natural gas distribution revenues
Residential2,843 — — — — 2,843 
Commercial763 — — — — 763 
Transportation1,186 — — — — 1,186 
Industrial84 — — — — 84 
Other342 — — — — 342 
Total natural gas distribution revenues5,218 — — — — 5,218 
Wholesale electric revenues
PPA energy revenues2,274 489 130 16 1,673 — 
PPA capacity revenues596 194 47 356 — 
Non-PPA revenues250 200 30 690 740 — 
Total wholesale electric revenues3,120 883 207 710 2,769 — 
Other natural gas revenues
Gas marketing services636 — — — — 636 
Other natural gas revenues51 — — — — 51 
Total other natural gas revenues687 — — — — 687 
Other revenues1,077 194 446 47 36 — 
Total revenue from contracts with customers25,941 6,921 9,702 1,703 2,805 5,905 
Other revenue sources(a)
3,338 896 1,882 (9)564 57 
Total operating revenues$29,279 $7,817 $11,584 $1,694 $3,369 $5,962 
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Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2021
Operating revenues
Retail electric revenues
Residential$6,207 $2,467 $3,471 $269 $— $— 
Commercial4,877 1,600 3,010 267 — — 
Industrial3,067 1,386 1,391 290 — — 
Other93 17 68 — — 
Total retail electric revenues14,244 5,470 7,940 834 — — 
Natural gas distribution revenues
Residential1,799 — — — — 1,799 
Commercial470 — — — — 470 
Transportation1,038 — — — — 1,038 
Industrial49 — — — — 49 
Other269 — — — — 269 
Total natural gas distribution revenues3,625 — — — — 3,625 
Wholesale electric revenues
PPA energy revenues1,122 184 95 11 854 — 
PPA capacity revenues493 115 55 323 — 
Non-PPA revenues236 170 21 401 398 — 
Total wholesale electric revenues1,851 469 171 417 1,575 — 
Other natural gas revenues
Wholesale gas services2,168 — — — — 2,168 
Gas marketing services464 — — — — 464 
Other natural gas revenues36 — — — — 36 
Total other natural gas revenues2,668 — — — — 2,668 
Other revenues1,075 202 452 31 30 — 
Total revenue from contracts with customers23,463 6,141 8,563 1,282 1,605 6,293 
Other revenue sources(a)
3,349 272 697 40 611 1,786 
Other adjustments(b)
(3,699)— — — — (3,699)
Total operating revenues$23,113 $6,413 $9,260 $1,322 $2,216 $4,380 
(a)Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues (including those related to fuel costs) that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies.
(b)Other adjustments relate to the cost of Southern Company Gas' energy and risk management activities. Wholesale gas services revenues are presented net of the related costs of those activities on the statement of income. See Notes 15 and 16 under "Southern Company Gas" for information on the sale of Sequent and components of wholesale gas services' operating revenues, respectively.
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Contract Balances
The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at December 31, 2023 and 2022:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Accounts Receivable
At December 31, 2023$2,820 $821 $1,011 $90 $122 $684 
At December 31, 20223,123 696 922 92 237 1,107 
Contract Assets
At December 31, 2023$271 $$121 $— $— $56 
At December 31, 2022156 89 — — — 
Contract Liabilities
At December 31, 2023$116 $— $$— $$— 
At December 31, 202245 — — 
Contract assets for Georgia Power primarily relate to retail customer fixed bill programs, where the payment is contingent upon Georgia Power's continued performance and the customer's continued participation in the program over a one-year contract term, and unregulated service agreements, where payment is contingent on project completion. Contract liabilities for Georgia Power primarily relate to cash collections recognized in advance of revenue for unregulated service agreements. Southern Company Gas' contract assets relate to work performed on an energy efficiency enhancement and upgrade contract with the U.S. General Services Administration. Southern Company Gas receives cash advances from a third-party financial institution to fund work performed, of which approximately $59 million had been received at December 31, 2023. These advances have been accounted for as long-term debt on the balance sheets. See Note 1 under "Affiliate Transactions" for additional information regarding the construction contract. At December 31, 2023 and 2022, Southern Company's unregulated distributed generation business had contract assets of $91 million and $65 million, respectively, and contract liabilities of $115 million and $32 million, respectively, for outstanding performance obligations.
Revenues recognized in 2023 and 2022, which were included in contract liabilities at December 31, 2023 and 2022, respectively, were $36 million annually for Southern Company and immaterial for the other Registrants. Contract liabilities are primarily classified as current on the balance sheets as the corresponding revenues are generally expected to be recognized within one year.
Remaining Performance Obligations
The Subsidiary Registrants may enter into long-term contracts with customers in which revenues are recognized as performance obligations are satisfied over the contract term. For the traditional electric operating companies and Southern Power, these contracts primarily relate to PPAs whereby electricity and generation capacity are provided to a customer. The revenue recognized for the delivery of electricity is variable; however, certain PPAs include a fixed payment for fixed generation capacity over the term of the contract. For Southern Company Gas, these contracts primarily relate to the U.S. General Services Administration contract described above. Southern Company's unregulated distributed generation business also has partially satisfied performance obligations related to certain fixed price contracts. Revenues from contracts with customers related to these performance obligations remaining at December 31, 2023 are expected to be recognized as follows:
20242025202620272028Thereafter
(in millions)
Southern Company$940 $552 $338 $332 $323 $2,045 
Alabama Power23 — — — — 
Georgia Power73 41 14 15 15 
Mississippi Power60 63 66 69 73 — 
Southern Power379 301 299 306 297 2,041 
Southern Company Gas26 — — — — — 
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5. PROPERTY, PLANT, AND EQUIPMENT
Property, plant, and equipment is stated at original cost or fair value at acquisition, as appropriate, less any regulatory disallowances and impairments. Original cost may include: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and/or cost of equity funds used during construction.
The Registrants' property, plant, and equipment in service consisted of the following at December 31, 2023 and 2022:
At December 31, 2023:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Electric utilities:
Generation$57,325 $16,584 $22,587 $2,909 $14,649 $ 
Transmission15,561 6,152 8,402 966   
Distribution26,482 9,775 15,380 1,327   
General/other6,305 2,918 3,001 321 41  
Electric utilities' plant in service105,673 35,429 49,370 5,523 14,690  
Southern Company Gas:
Natural gas transportation and distribution17,798     17,798 
Storage facilities1,565     1,565 
Other1,477     1,477 
Southern Company Gas plant in service20,840     20,840 
Other plant in service1,915      
Total plant in service$128,428 $35,429 $49,370 $5,523 $14,690 $20,840 
At December 31, 2022:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Electric utilities:
Generation$51,756 $15,920 $17,755 $2,826 $14,619 $— 
Transmission14,201 5,658 7,576 927 — — 
Distribution24,200 9,154 13,819 1,228 — — 
General/other5,806 2,740 2,729 273 39 — 
Electric utilities' plant in service95,963 33,472 41,879 5,254 14,658 — 
Southern Company Gas:
Natural gas transportation and distribution16,810 — — — — 16,810 
Storage facilities1,553 — — — — 1,553 
Other1,360 — — — — 1,360 
Southern Company Gas plant in service19,723 — — — — 19,723 
Other plant in service1,843 — — — — — 
Total plant in service$117,529 $33,472 $41,879 $5,254 $14,658 $19,723 
The cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed with the exception of nuclear refueling costs and certain maintenance costs including those described below.
In accordance with orders from their respective state PSCs, Alabama Power and Georgia Power defer nuclear refueling outage operations and maintenance expenses to a regulatory asset when the charges are incurred. Alabama Power amortizes the costs over a subsequent 18-month period with Plant Farley's fall outage cost amortization beginning in January of the following year and spring outage cost amortization beginning in July of the same year. Georgia Power amortizes its costs over each unit's
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operating cycle, or 18 months for Plant Vogtle Units 1, 2, and 3 and 24 months for Plant Hatch Units 1 and 2. Georgia Power's amortization period begins the month the refueling outage starts.
A portion of Mississippi Power's railway track maintenance costs is charged to fuel stock and recovered through Mississippi Power's fuel clause.
The portion of Southern Company Gas' non-working gas used to maintain the structural integrity of natural gas storage facilities that is considered to be non-recoverable is depreciated, while the recoverable or retained portion is not depreciated.
See Note 9 for information on finance lease right-of-use (ROU) assets, net, which are included in property, plant, and equipment.
The Registrants have deferred certain implementation costs related to cloud hosting arrangements. At December 31, 2023 and 2022, deferred cloud implementation costs, net of amortization, which are generally included in other deferred charges and assets on the Registrants' balance sheets, are as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred cloud implementation costs, net:
At December 31, 2023$325 $85 $99 $13 $15 $43 
At December 31, 2022345 81 108 14 18 54 
Once a hosted software is placed into service, the related deferred costs are amortized on a straight-line basis over the remaining expected hosting arrangement term, including any renewal options that are reasonably certain of exercise. The amortization is reflected with the associated cloud hosting fees, which are generally reflected in other operations and maintenance expenses on the Registrants' statements of income. In 2023, amortization of deferred cloud implementation costs recognized was $46 million for Southern Company, $11 million for Alabama Power, $19 million for Georgia Power, $8 million for Southern Company Gas, and immaterial for the other Registrants. In 2022, amortization of deferred cloud implementation costs recognized was $29 million for Southern Company, $8 million for Alabama Power, $12 million for Georgia Power, and immaterial for the other Registrants. In 2021, amortization from deferred cloud implementation costs recognized was immaterial for all Registrants.
See Note 2 under "Regulatory Assets and Liabilities" and "Alabama Power – Software Accounting Order" for information on deferrals of certain other operations and maintenance costs associated with software and cloud computing projects by the traditional electric operating companies and natural gas distribution utilities, as authorized by their respective state PSCs or applicable state regulatory agencies.
Depreciation and Amortization
The traditional electric operating companies' and Southern Company Gas' depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates. The approximate rates for 2023, 2022, and 2021 are as follows:
202320222021
Alabama Power4.1 %2.7 %2.7 %
Georgia Power3.8 %3.3 %3.3 %
Mississippi Power3.4 %3.4 %3.6 %
Southern Company Gas2.7 %2.7 %2.8 %
Depreciation studies are conducted periodically to update the composite rates. These studies are filed with the respective state PSC and/or other applicable state and federal regulatory agencies for the traditional electric operating companies and the natural gas distribution utilities. Effective January 1, 2023, Alabama Power's and Georgia Power's depreciation rates were revised. See Note 2 for additional information.
When property, plant, and equipment subject to composite depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the asset are retired when the related property unit is retired.
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At December 31, 2023 and 2022, accumulated depreciation for Southern Company and Southern Company Gas consisted of utility plant in service totaling $36.6 billion and $34.3 billion, respectively, for Southern Company and $5.3 billion and $5.1 billion, respectively, for Southern Company Gas, as well as other plant in service totaling $1.1 billion and $1.0 billion, respectively, for Southern Company and $210 million and $184 million, respectively, for Southern Company Gas. Other plant in service includes the non-utility assets of Southern Company Gas, as well as, for Southern Company, certain other non-utility subsidiaries. Depreciation of the original cost of other plant in service is provided primarily on a straight-line basis over estimated useful lives. Useful lives for Southern Company Gas's non-utility assets range from five to 12 years for transportation equipment, 30 to 75 years for storage facilities, and up to 75 years for other assets. Useful lives for the assets of Southern Company's other non-utility subsidiaries range up to 30 years.
Southern Power
Southern Power applies component depreciation, where depreciation is computed principally by the straight-line method over the estimated useful life of the asset. Certain of Southern Power's generation assets related to natural gas-fired facilities are depreciated on a units-of-production basis, using hours or starts, to better match outage and maintenance costs to the usage of, and revenues from, these assets. The primary assets in Southern Power's property, plant, and equipment are generating facilities, which generally have estimated useful lives as follows:
Southern Power Generating FacilityUseful life
Natural gasUp to 50 years
SolarUp to 35 years
WindUp to 35 years
When Southern Power's depreciable property, plant, and equipment is retired, or otherwise disposed of in the normal course of business, the applicable cost and accumulated depreciation is removed and a gain or loss is recognized in the statements of income. Southern Power reviews its estimated useful lives and salvage values on an ongoing basis. The Company accounts for SEGCO usingresults of these reviews could result in changes which could have a material impact on Southern Power's net income.
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Joint Ownership Agreements
At December 31, 2023, the equity method. See Note 7 under "Guarantees" for additional information.Registrants' percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation were as follows:
The Company
Facility (Type)Percent
Ownership
Plant in ServiceAccumulated
Depreciation
CWIP
(in millions)
Alabama Power
Greene County (natural gas) Units 1 and 260.0 %(a)$191 $113 $
Plant Miller (coal) Units 1 and 291.8 (b)2,156 778 40 
Georgia Power
Plant Hatch (nuclear) Units 1 and 250.1 %(c)$1,446 $659 $70 
Plant Vogtle (nuclear) Units 1 and 245.7 (c)3,664 2,331 62 
Plant Vogtle (nuclear) Units 3 and 445.7 (c)(d)4,613 19 3,232 
Plant Scherer (coal) Units 1 and 28.4 (c)287 123 
Plant Scherer (coal) Unit 375.0 (c)1,310 639 10 
Rocky Mountain (pumped storage)25.4 (e)181 153 — 
Mississippi Power
Greene County (natural gas) Units 1 and 240.0 %(a)$125 $80 $— 
Plant Daniel (coal) Units 1 and 250.0 (f)805 281 
Southern Company Gas
Dalton Pipeline (natural gas pipeline)50.0 %(g)$271 $27 $— 
(a)Jointly owned by Alabama Power and Mississippi Power and operated and maintained by Alabama Power.
(b)Jointly owned with PowerSouth and operated and maintained by Alabama Power.
(c)Georgia Power owns undivided interests in Plants Vogtle, Hatch, Wansley,Vogtle, and Scherer in varying amounts jointly with one or more of the following entities: Oglethorpe Power Corporation (OPC),OPC, MEAG Power, the City of Dalton, FP&L, and JEA. Georgia acting by and through its Board of Water, Light, and Sinking Fund Commissioners, doing business as Dalton Utilities, Florida Power & Light Company, Jacksonville Electric Authority, and Gulf Power. Under these agreements, the Company has been contracted to operate and maintain the plants as agent for the co-owners and is jointly and severally liable for third party claims related to these plants. In addition, the Company jointly owns the Rocky Mountain pumped storage hydroelectric plant
(d)Unit 4 remains under construction. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
(e)Jointly owned with OPC, which is the operator of the plant.
(f)Jointly owned by FP&L and Mississippi Power. In August 2016,accordance with the Company sold its 33% ownership interest inoperating agreement, Mississippi Power acts as FP&L's agent with respect to the Intercession City combustion turbine unit to Duke Energy Florida, LLC.operation and maintenance of these units. See Note 3 under "Other Matters – Mississippi Power – Plant Daniel" for additional information.
At December 31, 2017(g)Jointly owned with The Williams Companies, Inc., the Company's percentageDalton Pipeline is a 115-mile natural gas pipeline that serves as an extension of the Transcontinental Gas Pipe Line Company, LLC pipeline system into northwest Georgia. Southern Company Gas leases its 50% undivided ownership for approximately $26 million annually through 2042. The lessee is responsible for maintaining the pipeline during the lease term and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation with the above entities were as follows:
Facility (Type)Company Ownership Plant in Service Accumulated Depreciation CWIP
   (in millions)
Plant Vogtle (nuclear)       
Units 1 and 245.7% $3,564
 $2,141
 $70
Plant Hatch (nuclear)50.1
 1,321
 595
 87
Plant Wansley (coal)53.5
 1,053
 335
 72
Plant Scherer (coal)       
Units 1 and 28.4
 261
 93
 8
Unit 375.0
 1,232
 468
 26
Rocky Mountain (pumped storage)25.4
 182
 132
 
for providing service to transportation customers under its FERC-regulated tariff.
The Company'sRegistrants' proportionate share of its planttheir jointly-owned facility operating expenses is included in the corresponding operating expenses in the statements of income and the Companyeach Registrant is responsible for providing its own financing.
Assets Subject to Lien
Mississippi Power provides retail service to its largest retail customer, Chevron Products Company (Chevron), at its refinery in Pascagoula, Mississippi through at least 2038 in accordance with agreements approved by the Mississippi PSC. The agreements grant Chevron a security interest in the co-generation assets located at the refinery and owned by Mississippi Power, with a lease receivable balance of $147 million at December 31, 2023, that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the three rating agencies. See Note 9 under "Lessor" for additional information.
See Note 8 under "Long-term Debt" for information regarding debt secured by certain assets of Georgia Power and Southern Company Gas.
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6. ASSET RETIREMENT OBLIGATIONS
AROs are computed as the present value of the estimated costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. Each traditional electric operating company and natural gas distribution utility has received accounting guidance from its state PSC or applicable state regulatory agency allowing the continued accrual or recovery of other retirement costs for long-lived assets that it does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as regulatory liabilities and amounts to be recovered are reflected in the balance sheets as regulatory assets.
The ARO liabilities for the traditional electric operating companies primarily relate to facilities that are subject to the CCR Rule and the related state rules, principally ash ponds. In addition, Alabama Power and Georgia Power Company 2017 Annual Report

The Company also owns 45.7%have retirement obligations related to the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 31 through 3). See "Nuclear Decommissioning" herein for additional information. Other significant AROs include various landfill sites and 4,asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power. The ARO liability for Southern Power primarily relates to its solar and wind facilities, which are currently under constructionlocated on long-term land leases requiring the restoration of land at the end of the lease.
The traditional electric operating companies and hadSouthern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company system's rail lines and natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for certain retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these retirement obligations will be recognized when sufficient information becomes available to support a CWIPreasonable estimation of the ARO.
Southern Company and the traditional electric operating companies will continue to recognize in their respective statements of income allowed removal costs in accordance with regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability in the balance sheets as ordered by the various state PSCs.
Details of $3.3 billionthe AROs included in the balance sheets are as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi Power
Southern Power(*)
(in millions)
Balance at December 31, 2021$11,687 $4,334 $6,824 $190 $131 
Liabilities incurred36 — 35 — — 
Liabilities settled(455)(205)(212)(20)— 
Accretion expense406 158 231 
Cash flow revisions(834)— (844)
Balance at December 31, 2022$10,840 $4,287 $6,034 $179 $144 
Liabilities incurred90  90   
Liabilities settled(617)(270)(304)(18) 
Accretion expense403 156 230 5 6 
Cash flow revisions(399)(15)(385)2  
Balance at December 31, 2023$10,317 $4,158 $5,665 $168 $150 
(*)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.
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In December 2022, Georgia Power recorded a net decrease of approximately $780 million to its AROs related to the CCR Rule and the related state rule resulting from changes in estimates, including lower future inflation rates, higher discount rates, and timing of closure activities, as well as a change in closure methodology for one ash pond as approved in Georgia Power's 2022 IRP.
Following initial criticality for Plant Vogtle Unit 3 on March 6, 2023, Georgia Power recorded AROs of approximately $90 million. Subsequent to December 31, 2017.2023, Plant Vogtle Unit 4 achieved initial criticality, which will result in Georgia Power recording AROs of approximately $118 million during the first quarter 2024. See Note 32 under "Retail Regulatory Matters"Georgia Power – Nuclear Construction" for additional information.
5. INCOME TAXES
On behalfIn September 2023 and November 2023, Georgia Power recorded net decreases of the Company, Southern Company files a consolidated federal income tax returnapproximately $175 million and various combined and separate state income tax returns. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.
Federal Tax Reform Legislation
Following the enactment of Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up$210 million, respectively, to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Dueits AROs related to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of Tax Reform Legislation on deferred income tax assets and liabilitiesCCR Rule and the related state rule resulting from changes in estimates, including lower future inflation rates and the timing of closure activities.
In June 2023, Alabama Power completed an updated decommissioning cost site study for Plant Farley. The estimated cost of decommissioning based on the study resulted in a decrease in Alabama Power's ARO liability of approximately $15 million. See "Nuclear Decommissioning" herein for additional information.
The cost estimates for AROs related to the disposal of CCR are based on information at December 31, 2023 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule and the related state rules. The traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to these assumptions becomes available. Some of these updates have been, and future updates may be, material. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory assetsagencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and liabilitiesfinancial condition for Southern Company and the traditional electric operating companies could be materially impacted. The ultimate outcome of these matters cannot be determined at this time. See Note 3 under "Retail Regulatory"General Litigation Matters – Rate Plans"Alabama Power" for additional information.
CurrentNuclear Decommissioning
The NRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. Alabama Power and Deferred Income TaxesGeorgia Power have external trust funds (Funds) to comply with the NRC's regulations. Use of the Funds is restricted to nuclear decommissioning activities. The Funds are managed and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and state PSCs, as well as the IRS. While Alabama Power and Georgia Power are allowed to prescribe an overall investment policy to the Funds' managers, neither Southern Company nor its subsidiaries or affiliates are allowed to engage in the day-to-day management of the Funds or to mandate individual investment decisions. Day-to-day management of the investments in the Funds is delegated to unrelated third-party managers with oversight by the management of Alabama Power and Georgia Power. The Funds' managers are authorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the return on the Funds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities.
DetailsAlabama Power and Georgia Power record the investment securities held in the Funds at fair value, as disclosed in Note 13, as management believes that fair value best represents the nature of the Funds. Gains and losses, whether realized or unrealized, are recorded in the regulatory liability for AROs in the balance sheets and are not included in net income tax provisionsor OCI. Fair value adjustments and realized gains and losses are as follows:determined on a specific identification basis.
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 2017 2016 2015
 (in millions)
Federal –     
Current$256
 $391
 $515
Deferred504
 319
 176
 760
 710
 691
State –     
Current116
 6
 81
Deferred(46) 64
 (3)
 70
 70
 78
Total$830
 $780
 $769

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Georgia Power Company 2017 Annual Report

The tax effects of temporary differences between the carrying amounts of assets and liabilitiesInvestment securities in the financial statementsFunds for December 31, 2023 and their respective tax bases, which give rise to deferred tax assets and liabilities, are2022 were as follows:
Southern CompanyAlabama
Power
Georgia
Power
(in millions)
At December 31, 2023:
Equity securities$1,288 $796 $492 
Debt securities895 277 618 
Other securities239 186 53 
Total investment securities in the Funds$2,422 $1,259 $1,163 
At December 31, 2022:
Equity securities$1,095 $690 $405 
Debt securities838 267 571 
Other securities210 168 42 
Total investment securities in the Funds(*)
$2,143 $1,125 $1,018 
 2017 2016
 (in millions)
Deferred tax liabilities –   
Accelerated depreciation$3,540
 $5,266
Property basis differences
 957
Employee benefit obligations287
 428
Premium on reacquired debt34
 56
Regulatory assets –   
Storm damage reserves89
 83
Employee benefit obligations348
 546
Asset retirement obligations501
 726
Retired assets30
 55
Asset retirement obligations132
 182
Other100
 83
Total5,061
 8,382
Deferred tax assets –   
Federal effect of state deferred taxes72
 173
Employee benefit obligations423
 661
Property basis differences92
 105
Other deferred costs69
 100
State investment tax credit carryforward318
 201
Federal tax credit carryforward97
 84
Unbilled fuel revenue26
 47
Regulatory liabilities associated with asset retirement obligations5
 33
Asset retirement obligations631
 908
Regulatory liability associated with Tax Reform Legislation (not subject to normalization)123
 
Other30
 70
Total1,886
 2,382
Accumulated deferred income taxes$3,175
 $6,000
(*)For Southern Company and Georgia Power, these amounts include investment securities pledged to creditors and collateral received and excludes payables related to a securities lending program Georgia Power's Funds previously participated in through the managers of the Funds. Under this program, Georgia Power's Funds' investment securities were loaned to institutional investors for a fee. Securities loaned were fully collateralized by cash, letters of credit, and/or securities issued or guaranteed by the U.S. government or its agencies or instrumentalities. At December 31, 2022, approximately $35 million of the fair market value of Georgia Power's Funds' securities were on loan and pledged to creditors under the Funds' managers' securities lending program. At December 31, 2022, the fair value of the collateral received was approximately $36 million and could only be sold by the borrower upon the return of the loaned securities. The collateral received was treated as a non-cash item in the statements of cash flows.
These amounts exclude receivables related to investment income and pending investment sales and payables related to pending investment purchases.
The implementation of Tax Reform Legislation significantly reduced accumulated deferred income taxes, partially offset by bonus depreciation provisionsfair value increases (decreases) of the Protecting Americans from Tax Hikes Act. Tax Reform Legislation also reduced tax-related regulatory assetsFunds, including unrealized gains (losses) and significantly increased tax-related regulatory liabilities.reinvested interest and dividends and excluding the Funds' expenses, for 2023, 2022, and 2021 are shown in the table below.
Southern CompanyAlabama
Power
Georgia
Power
(in millions)
Fair value increases (decreases)
2023$281 $157 $124 
2022(360)(171)(189)
2021274 200 74 
Unrealized gains (losses)
At December 31, 2023$241 $119 $122 
At December 31, 2022(391)(204)(187)
At December 31, 2021(27)(30)
The investment securities held in the Funds continue to be managed with a long-term focus. Accordingly, all purchases and sales within the Funds are presented separately in the statements of cash flows as investing cash flows, consistent with the nature of the securities and purpose for which the securities were acquired.
For Alabama Power, approximately $13 million and $14 million at December 31, 2023 and 2022, respectively, previously recorded in internal reserves is being transferred into the Funds through 2040 as approved by the Alabama PSC.
The NRC's minimum external funding requirements are based on a generic estimate of the cost to decommission only the radioactive portions of a nuclear unit based on the size and type of reactor. Alabama Power and Georgia Power have filed plans with the NRC designed to ensure that, over time, the deposits and earnings of the Funds will provide the minimum funding amounts prescribed by the NRC.
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At December 31, 2017, tax-related regulatory assets2023 and 2022, the accumulated provisions for the external decommissioning trust funds were as follows:
20232022
(in millions)
Alabama Power
Plant Farley$1,259 $1,125 
Georgia Power
Plant Hatch$705 $628 
Plant Vogtle Units 1 and 2434 382 
Plant Vogtle Units 3 and 424 
Total$1,163 $1,018 
Site study cost is the estimate to decommission a specific facility as of the site study year. The decommissioning cost estimates are based on removal of the plant from service and prompt dismantlement. The actual decommissioning costs may vary from these estimates because of changes in the assumed date of decommissioning, changes in NRC requirements, or changes in the assumptions used in making these estimates. The estimated costs of decommissioning at December 31, 2023 based on the most current studies were as follows:
Alabama PowerGeorgia Power
Plant
Farley
Plant
 Hatch(*)
Plant Vogtle
 Units 1 and 2(*)
Plant Vogtle
 Unit 3(*)
Most current study year2023202120212020
Decommissioning periods:
Beginning year2037203420472063
Completion year2087207520792074
(in millions)
Site study costs:
Radiated structures$1,402 $771 $628 $284 
Spent fuel management513 186 170 30 
Non-radiated structures133 61 85 33 
Total site study costs$2,048 $1,018 $883 $347 
(*)Based on Georgia Power's ownership interests.
For ratemaking purposes, Alabama Power's decommissioning costs are based on the site study and Georgia Power's decommissioning costs are based on the NRC generic estimate to decommission the radioactive portion of the facilities and the site study estimate for spent fuel management. Significant assumptions used to determine these costs for ratemaking were an estimated inflation rate of 4.5% for Plant Farley, 2.5% for Plants Hatch and Vogtle Units 1 and 2, and 2.4% for Plant Vogtle Unit 3 and an estimated trust earnings rate of 7.0% for Plant Farley, 4.5% for Plants Hatch and Vogtle Units 1 and 2, and 4.4% for Plant Vogtle Unit 3.
Amounts previously contributed to the Funds for Plant Farley are currently projected to be recovered from customers were $521 million. These assetsadequate to meet the decommissioning obligations. Alabama Power's site-specific estimates of decommissioning costs for Plant Farley are primarily attributable to tax benefits flowed through to customers in prior years and deferred taxes previously recognized at rates lower than the current enacted tax law.
At December 31, 2017, tax-related regulatory liabilitiesupdated every five years. The next site study for Alabama Power is expected to be creditedcompleted in 2028. Projections of funds are reviewed with the Alabama PSC to customers were $3.2 billion. Theseensure that, over time, the deposits and earnings of the Funds will provide adequate funding to cover the site-specific costs. If necessary, Alabama Power would seek the Alabama PSC's approval to address any changes in a manner consistent with NRC and other applicable requirements.
Under the 2019 ARP, Georgia Power's annual decommissioning cost for ratemaking in 2021 and 2022 was a total of $4 million for Plant Hatch and Plant Vogtle Units 1 and 2. Effective January 1, 2023, as approved in the 2022 ARP, there is no annual decommissioning cost for ratemaking for Plant Hatch and Plant Vogtle Units 1 and 2. Any funding amount required by the NRC during the period covered by the 2022 ARP will be deferred to a regulatory asset and recovery is expected to be determined in Georgia Power's next base rate case. See Note 2 under "Georgia Power – Rate Plans – 2022 ARP" for additional information. Effective August 1, 2023, as approved under the Plant Vogtle Unit 3 and Common Facilities rate proceeding, Georgia Power's
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annual decommissioning cost for ratemaking is $8 million for Plant Vogtle Unit 3. See Note 2 under "Georgia Power – Nuclear Construction – Regulatory Matters" for additional information.
7. CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS
The Registrants may hold ownership interests in a number of business ventures with varying ownership structures. Partnership interests and other variable interests are evaluated to determine if each entity is a VIE. If a venture is a VIE for which a Registrant is the primary beneficiary, the assets, liabilities, and results of operations of the entity are primarily attributableconsolidated. The Registrants reassess the conclusion as to deferred taxes previously recognized at rates higher thanwhether an entity is a VIE upon certain occurrences, which are deemed reconsideration events.
For entities that are not determined to be VIEs, the current enacted tax law.
In accordance with regulatory requirements, federal ITCs are deferred and, upon utilization, amortizedRegistrants evaluate whether they have control or significant influence over the average lifeinvestee to determine the appropriate consolidation and presentation. Generally, entities under the control of a Registrant are consolidated, and entities over which a Registrant can exert significant influence, but which a Registrant does not control, are accounted for under the related property with such amortization normally applied as a credit to reduce depreciationequity method of accounting.
Investments accounted for under the equity method are recorded within equity investments in unconsolidated subsidiaries in the balance sheets and, for Southern Company and Southern Company Gas, the equity income is recorded within earnings from equity method investments in the statements of income. Credits amortized in this manner amounted to $10 million in each of 2017, 2016,See "SEGCO" and 2015. State investment tax credits are recognized in the period in which the credits are generated and totaled $50 million in 2017, $42 million in 2016, and $33 million in 2015. "Southern Company Gas" herein for additional information.
Southern Company
At December 31, 2017,2023 and 2022, Southern Holdings had equity method investments totaling $126 million and $112 million, respectively, primarily related to investments in venture capital funds focused on energy and utility investments. Earnings from these investments were immaterial for all periods presented.
SEGCO
Alabama Power and Georgia Power own equally all of the outstanding capital stock of SEGCO, which owns electric generating units at Plant Gaston with a total rated capacity of 1,020 MWs, as well as associated transmission facilities. Retirement of SEGCO's generating units is currently expected to occur by December 31, 2028. However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. See Note 2 under "Georgia Power – Integrated Resource Plans" for additional information. Alabama Power and Georgia Power account for SEGCO using the equity method; Southern Company had $87consolidates SEGCO. The capacity of these units is sold equally to Alabama Power and Georgia Power. Alabama Power and Georgia Power make payments sufficient to provide for the operating expenses, taxes, interest expense, and a ROE. The share of purchased power included in purchased power, affiliates in the statements of income totaled $112 million in federal ITC carryforwards that will expire by 2037 and $3182023, $124 million in state ITC carryforwards2022, and $75 million in 2021 for Alabama Power and $115 million in 2023, $127 million in 2022, and $77 million in 2021 for Georgia Power.
SEGCO paid dividends of $25 million in 2023, $14 million in 2022, and $14 million in 2021, one half of which were paid to each of Alabama Power and Georgia Power. In addition, Alabama Power and Georgia Power each recognize 50% of SEGCO's net income.
Alabama Power, which owns and operates a generating unit adjacent to the SEGCO generating units, has a joint ownership agreement with SEGCO for the ownership of an associated gas pipeline. Alabama Power owns 14% of the pipeline with the remaining 86% owned by SEGCO.
See Note 3 under "Guarantees" for additional information regarding guarantees of Alabama Power and Georgia Power related to SEGCO.
Southern Power
Variable Interest Entities
Southern Power has certain subsidiaries that will expire between 2020are determined to be VIEs. Southern Power is considered the primary beneficiary of these VIEs because it controls the most significant activities of the VIEs, including operating and 2028.maintaining the respective assets, and has the obligation to absorb expected losses of these VIEs to the extent of its equity interests.
SP Solar and SP Wind
SP Solar is owned by Southern Power and a limited partner. A wholly-owned subsidiary of Southern Power is the general partner and holds a 1% ownership interest, and another wholly-owned subsidiary of Southern Power owns a 66% ownership interest. The limited partner holds the remaining 33% noncontrolling interest. SP Solar qualifies as a VIE since the arrangement is structured as a limited partnership and the 33% limited partner does not have substantive kick-out rights against the general partner.
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Georgia Power Company 2017 Annual Report

Effective Tax Rate
A reconciliationAt December 31, 2023 and 2022, SP Solar had total assets of $5.6 billion and $5.9 billion, respectively, total liabilities of $0.4 billion, and noncontrolling interests of $1.0 billion and $1.1 billion, respectively. Cash distributions from SP Solar are allocated 67% to Southern Power and 33% to the limited partner in accordance with their partnership interest percentage. Under the terms of the federal statutory income tax ratelimited partnership agreement, distributions without limited partner consent are limited to available cash and SP Solar is obligated to distribute all such available cash to its partners each quarter. Available cash includes all cash generated in the quarter subject to the effective incomemaintenance of appropriate operating reserves.
SP Wind is owned by Southern Power and three financial investors. A wholly-owned subsidiary of Southern Power owns 100% of the Class B membership interests and the three financial investors own 100% of the Class A membership interests. SP Wind qualifies as a VIE since the structure of the arrangement is similar to a limited partnership and the Class A members do not have substantive kick-out rights against Southern Power.
At December 31, 2023 and 2022, SP Wind had total assets of $2.1 billion and $2.2 billion, respectively, total liabilities of $187 million and $169 million, respectively, and noncontrolling interests of $38 million and $39 million, respectively. Under the terms of the limited liability agreement, distributions without Class A member consent are limited to available cash and SP Wind is obligated to distribute all such available cash to its members each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves. Cash distributions from SP Wind are generally allocated 60% to Southern Power and 40% to the three financial investors in accordance with the limited liability agreement.
Southern Power consolidates both SP Solar and SP Wind, as the primary beneficiary, since it controls the most significant activities of each entity, including operating and maintaining their assets. Certain transfers and sales of the assets in the VIEs are subject to partner consent and the liabilities are non-recourse to the general credit of Southern Power. Liabilities consist of customary working capital items and do not include any long-term debt.
Other Variable Interest Entities
Southern Power has other consolidated VIEs that relate to certain subsidiaries that have either sold noncontrolling interests to tax rate is as follows:equity investors or acquired less than a 100% interest from facility developers. These entities are considered VIEs because the arrangements are structured similar to a limited partnership and the noncontrolling members do not have substantive kick-out rights.
 2017 2016 2015
Federal statutory rate35.0 % 35.0 % 35.0 %
State income tax, net of federal deduction2.0
 2.1
 2.5
Non-deductible book depreciation0.7
 0.8
 1.2
AFUDC equity(0.6) (0.8) (0.7)
Tax Reform Legislation(0.4) 
 
Other
 (0.4) (0.4)
Effective income tax rate36.7 % 36.7 % 37.6 %
In March 2016,At December 31, 2023 and 2022, the FASB issued ASU 2016-09, which changedother VIEs had total assets of $1.7 billion and $1.8 billion, respectively, total liabilities of $0.2 billion, and noncontrolling interests of $0.8 billion. Under the accounting for income taxes for share-based payment award transactions. Entitiesterms of the partnership agreements, distributions of all available cash are required to recognize all excess tax benefitseach month or quarter and deficiencies related to the exercise or vesting of stock compensation as income tax expense or benefitadditional distributions require partner consent.
Equity Method Investments
During 2023 and 2022, Southern Power sold its remaining equity method investments in the income statement. The adoption of ASU 2016-09 did not have a material impact on the Company's overall effective tax rate. See Note 1 under "Recently Issued Accounting Standards" for additional information.
Unrecognized Tax Benefits
The Company had no material unrecognized tax benefits as of December 31, 2017wind projects and no material changes in unrecognized tax benefits for any year presented.
The Company classifies interest on tax uncertainties as interest expense; however, the Company did not have any accrued interest or penalties for unrecognized tax benefits for any year presented.
It is reasonably possible that the amount of the unrecognized tax benefits could change within 12 months. The settlement of federal and state audits could impact the balances significantly. At this time, an estimate of the range of reasonably possible outcomes cannot be determined.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2016. Southern Company is a participant in the Compliance Assurance Process of the IRS. The audits for the Company's state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2011.
6. FINANCING
Securities Due Within One Year
A summary of scheduled maturities of securities due within one year at December 31 was as follows:
 2017 2016
 (in millions)
Senior notes$750
 $450
Capital leases11
 10
Other long-term debt


100
 
Unamortized debt issuance expense(1) 
Total$860
 $460
Maturities through 2022 applicable to total long-term debt are as follows: $861 million in 2018; $513 million in 2019; $1.0 billion in 2020; $375 million in 2021; and $518 million in 2022.
Bank Term Loans
In June 2017, the Company entered into three floating rate bank loans in aggregate principal amounts ofreceived proceeds totaling $50 million $150and $38 million, and $100 million, with maturity dates of December 1, 2017, May 31, 2018, and June 28, 2018, respectively, bearing interest based on one-month LIBOR. Also in June 2017, the Company borrowed $500 million pursuant to an uncommitted bank credit arrangement, which bears interest at a rate agreed upon by the Company and the bank from time to time and is payable on no less than 30 days' demand by the bank. The proceedsrespectively. Earnings (loss) from these bank loansinvestments, including the gains associated with the sales, were used to repay a portion of the Company'simmaterial for all periods presented.
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Georgia Power Company 2017 Annual Report

Southern Company Gas
existing indebtednessEquity Method Investments
The carrying amounts of Southern Company Gas' equity method investments at December 31, 2023 and 2022 and related earnings (loss) from those investments for working capitalthe years ended December 31, 2023, 2022, and other general corporate purposes,2021 were as follows:
Investment BalanceDecember 31, 2023December 31, 2022
(in millions)
SNG$1,202 $1,243 
Other33 33 
Total$1,235 $1,276 
Earnings (Loss) from Equity Method Investments202320222021
(in millions)
SNG$139 $146 $127 
PennEast Pipeline(*)
 — (81)
Other1 
Total$140 $148 $50 
(*)For 2021, includes pre-tax impairment charges totaling $84 million. See "PennEast Pipeline Project" herein for additional information, including the Company's continuous construction program.September 2021 cancellation of the project.
PennEast Pipeline Project
In August 2017,2014, Southern Company Gas entered into a partnership in which it holds a 20% ownership interest in the PennEast Pipeline, an interstate pipeline company formed to develop and operate an approximate 118-mile natural gas pipeline between New Jersey and Pennsylvania. In 2019, an appellate court ruled that the PennEast Pipeline does not have federal eminent domain authority over lands in which a state has property rights interests. In June 2021, the U.S. Supreme Court ruled in favor of PennEast Pipeline following a review of the appellate court decision. Southern Company repaid $250Gas assesses its equity method investments for impairment whenever events or changes in circumstances indicate that the investment may be impaired. Following the U.S. Supreme Court ruling, during the second quarter 2021, Southern Company Gas management reassessed the project construction timing, including the anticipated timing for receipt of a FERC certificate and all remaining state and local permits, as well as potential challenges thereto, and performed an impairment analysis. The outcome of the analysis resulted in a pre-tax impairment charge of $82 million ($58 million after tax). In September 2021, PennEast Pipeline announced that further development of the project was no longer supported, and, as a result, all further development of the project ceased. During the third quarter 2021, Southern Company Gas recorded an additional pre-tax charge of $2 million ($2 million after tax) related to its share of the project level impairment, as well as $7 million of additional tax expense, resulting in total pre-tax charges of $84 million ($67 million after tax) during 2021 related to the $500 million aggregate principal amount outstanding pursuantproject.
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At
COMBINED NOTES TO FINANCIAL STATEMENTS

8. FINANCING
Long-term Debt
Details of long-term debt at December 31, 2017,2023 and 2022 are provided in the Company hadfollowing table:
At December 31, 2023Balance Outstanding at
December 31,
MaturityWeighted Average
Interest Rate
20232022
(in millions)
Southern Company
Senior notes(a)
2024-20734.16%$40,235 $35,683 
Junior subordinated notes2024-20814.33%8,333 8,836 
FFB loans(b)
2024-20442.88%4,788 4,874 
Revenue bonds(c)
2024-20633.77%3,400 2,844 
First mortgage bonds(d)
2025-20633.64%2,500 2,275 
Medium-term notes2026-20277.03%84 84 
Other long-term debt2024-20455.44%234 167 
Finance lease obligations(e)
298 314 
Unamortized fair value adjustment302 330 
Unamortized debt premium (discount), net(198)(193)
Unamortized debt issuance expenses(290)(273)
Total long-term debt59,686 54,941 
Less: Amount due within one year2,476 4,285 
Total long-term debt excluding amount due within one year$57,210 $50,656 
Alabama Power
Senior notes2025-20733.95%$9,875 $9,675 
Revenue bonds(c)
2024-20633.94%1,321 995 
Other long-term debt2026-20307.04%75 45 
Finance lease obligations(e)
Unamortized debt premium (discount), net(20)(18)
Unamortized debt issuance expenses(73)(72)
Total long-term debt11,183 10,630 
Less: Amount due within one year223 301 
Total long-term debt excluding amount due within one year$10,960 $10,329 
Georgia Power
Senior notes2024-20524.34%$9,575 $7,925 
Junior subordinated notes20775.00%270 270 
FFB loans(b)
2024-20442.88%4,788 4,874 
Revenue bonds(c)
2025-20623.64%1,968 1,738 
Finance lease obligations(e)
240 238 
Unamortized debt premium (discount), net(19)(18)
Unamortized debt issuance expenses(122)(117)
Total long-term debt16,700 14,910 
Less: Amount due within one year502 901 
Total long-term debt excluding amount due within one year$16,198 $14,009 
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At December 31, 2023Balance Outstanding at
December 31,
MaturityWeighted Average
Interest Rate
20232022
(in millions)
Mississippi Power
Senior notes2024-20514.27%$1,525 $1,425 
Revenue bonds(c)
2025-20524.08%111 111 
Finance lease obligations(e)
16 17 
Unamortized debt premium (discount), net
Unamortized debt issuance expenses(9)(10)
Total long-term debt1,644 1,545 
Less: Amount due within one year201 
Total long-term debt excluding amount due within one year$1,443 $1,544 
Southern Power
Senior notes(a)
2025-20464.05%$2,728 $2,998 
Unamortized debt premium (discount), net(4)(5)
Unamortized debt issuance expenses(13)(14)
Total long-term debt2,711 2,979 
Less: Amount due within one year— 290 
Total long-term debt excluding amount due within one year$2,711 $2,689 
Southern Company Gas
Senior notes2025-20514.36%$4,930 $4,769 
First mortgage bonds(d)
2025-20633.64%2,500 2,275 
Medium-term notes2026-20277.03%84 84 
Other long-term debt2024-20453.81%59 22 
Unamortized fair value adjustment302 330 
Unamortized debt premium (discount), net(8)(8)
Unamortized debt issuance expenses(34)(30)
Total long-term debt7,833 7,442 
Less: Amount due within one year— 400 
Total long-term debt excluding amount due within one year$7,833 $7,042 
(a)Includes a totalfair value gain (loss) of $250$(12) million in bank term loans outstanding. Subsequent toand $(31) million at December 31, 2017,2023 and 2022, respectively, related to Southern Power's foreign currency hedge on its euro-denominated senior notes.
(b)Secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the Company repaid its outstanding $150 millionunits, the related real property, and $100 million floating rate bank loans due May 31, 2018 and October 26, 2018, respectively. At December 31, 2016, the Company had no bank term loans outstanding.
The outstanding bank loans as of December 31, 2017 had covenants that limited debt levels to 65% of total capitalization, as definedany nuclear fuel loaded in the agreements. For purposes of these definitions, debt excludes certain hybrid securities. At December 31, 2017,reactor core) and (ii) Georgia Power's rights and obligations under the Company was in compliance with its debt limits.
Senior Notes
In March 2017, the Company issued $450 million aggregate principal amount of Series 2017A 2.00% Senior Notes due March 30, 2020contracts relating to Plant Vogtle Units 3 and $400 million aggregate principal amount of Series 2017B 3.25% Senior Notes due March 30, 2027. The proceeds were used to repay a portion of the Company's short-term indebtedness and for general corporate purposes, including the Company's continuous construction program.
In August 2017, the Company issued $500 million aggregate principal amount of Series 2017C 2.00% Senior Notes due September 8, 2020. The proceeds were used to repay the Company's $50 million floating rate bank loan due December 1, 2017 and outstanding commercial paper borrowings and for general corporate purposes.
At December 31, 2017 and 2016, the Company had $7.1 billion and $6.2 billion of senior notes outstanding, respectively, which included senior notes due within one year. These senior notes are effectively subordinated to all secured debt of the Company, which aggregated $2.8 billion at both December 31, 2017 and 2016. As of December 31, 2017, the Company's secured debt included borrowings of $2.6 billion guaranteed by the DOE and capital lease obligations of $154 million. As of December 31, 2016, the Company's secured debt included borrowings of $2.6 billion guaranteed by the DOE and capital lease obligations of $169 million.4. See Note 7 and "DOE Loan Guarantee Borrowings" herein for additional information.
Pollution Control (c)Revenue Bonds
Pollution control revenue bond obligations represent loans to the Companytraditional electric operating companies from public authorities of funds derived from sales by such authorities of revenue bonds issued to finance pollution control and solid waste disposal and wastewater facilities. In some cases, the revenue bond obligations represent obligations under installment sales agreements with respect to facilities constructed with the proceeds of revenue bonds issued by public authorities. The Company istraditional electric operating companies are required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. The amountProceeds from certain issuances are restricted until qualifying expenditures are incurred.
(d)Secured by substantially all of tax-exempt pollution control revenue bond obligations outstanding at both December 31, 2017Nicor Gas' properties.
(e)Secured by the underlying lease ROU asset. See Note 9 for additional information.
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Maturities of long-term debt for the next five years are as follows:
Southern Company(a)
Alabama Power(b)
Georgia
Power(c)
Mississippi Power
Southern Power(d)
Southern Company
Gas
(in millions)
2024$2,480 $223 $503 $201 $— $— 
20254,124 251 849 12 500 300 
20263,791 46 448 66 964 530 
20272,075 551 512 10 — 154 
20282,612 107 864 357 — 150 
(a)See notes (b) and 2016 was $1.8 billion.(c) below.
In April 2017, the Company purchased and held $27 million aggregate principal amount of Development Authority of Burke County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Vogtle Project), Fifth Series 1995. In October 2017, the Company remarketed these bonds to the public.
In August 2017, the Company purchased and held $38 million aggregate principal amount of Development Authority of Bartow County (Georgia) Pollution Control Revenue Bonds (Georgia Power Company Plant Bowen Project), First Series 1997. In October 2017, the Company remarketed these bonds to the public.
Junior Subordinated Notes
At December 31, 2017, the Company had a total of $270 million of junior subordinated notes outstanding. At December 31, 2016, the Company had no junior subordinated notes outstanding.
In September 2017, the Company issued $270(b)Alabama Power's 2024 maturities include $200 million aggregate principal amount of Series 2017A 5.00% Junior Subordinated2023A Floating Rate Senior Notes due October 1, 2077. The proceeds were used to redeem all outstanding sharesMay 15, 2073 that are repayable at the option of the Company's preferredholders at certain dates beginning in 2024. As a result, the senior notes are classified as securities due within one year on the balance sheets of Southern Company and preference stock.Alabama Power at December 31, 2023.
(c)Amounts include principal amortization related to the FFB borrowings; however, the final maturity date is February 20, 2044. See "Outstanding Classes of Capital Stock""DOE Loan Guarantee Borrowings" herein for additional information.
(d)Southern Power's 2026 maturities include $564 million of euro-denominated debt at the U.S. dollar denominated hedge settlement amount.
DOE Loan Guarantee Borrowings
Pursuant to the loan guarantee program established under Title XVII of the Energy Policy Act of 2005 (Title XVII Loan Guarantee Program), the CompanyGeorgia Power and the DOE entered into a loan guarantee agreement in 2014 and the Amended and Restated Loan Guarantee Agreement in 2014, under which2019. Under the Amended and Restated Loan Guarantee Agreement, the DOE agreed to guarantee the obligations of the CompanyGeorgia Power under a note purchase agreement (FFB Note Purchase Agreement) among the DOE, the Company, and the FFB and a related promissory note (FFB Promissory Note). TheCredit Facilities. Under the FFB Note Purchase Agreement and

NOTES (continued)
Credit Facilities, Georgia Power Company 2017 Annual Report

the FFB Promissory Note provide for a multi-advance term loan facility (FFB Credit Facility), under which the Company maywas authorized to make term loan borrowings through the FFB.
On July 27, 2017, the Company entered intoFFB in an amendmentamount up to the Loan Guarantee Agreement (LGA Amendment) in connection with the DOE's consent to the Company's entry into the Vogtle Services Agreement and the related intellectual property licenses (IP Licenses).
Under the terms of the Loan Guarantee Agreement, upon termination of the Vogtle 3 and 4 Agreement, further advances are conditioned upon the DOE's approval of any agreements entered into in replacement of the Vogtle 3 and 4 Agreement. Under the terms of the LGA Amendment, the Company will not request any advances unless and until certain conditions are satisfied, including (i) receipt of the DOE's approval of the Bechtel Agreement (together with the Vogtle Services Agreement and the IP Licenses, the Replacement EPC Arrangements) and (ii) the Company's entry into a further amendment to the Loan Guarantee Agreement with the DOE to reflect the Replacement EPC Arrangements.
Proceeds of advances made under the FFB Credit Facility are used to reimburse the Company for Eligible Project Costs. Aggregateapproximately $5.130 billion, provided that total aggregate borrowings under the FFB Credit Facility mayFacilities could not exceed the lesser70% of (i) 70% of Eligible Project Costs orminus (ii) approximately $3.46 billion.$1.492 billion (reflecting the amounts received by Georgia Power under the Guarantee Settlement Agreement less the related customer refunds).
On September 28, 2017,In 2021, Georgia Power made the DOE issued a conditional commitment tofinal borrowings under the Company for up to approximately $1.67FFB Credit Facilities and no further borrowings are permitted. During 2023, Georgia Power made principal amortization payments of $86 million under the FFB Credit Facilities. At December 31, 2023 and 2022, Georgia Power had $4.8 billion and $4.9 billion of additional guaranteed loansborrowings outstanding under the Loan Guarantee Agreement. This conditional commitment expires on June 30, 2018, subject to any further extension approved by the DOE. Final approval and issuance of these additional loan guarantees by the DOE cannot be assured and are subject to the negotiation of definitive agreements, completion of due diligence by the DOE, receipt of any necessary regulatory approvals, and satisfaction of other conditions.FFB Credit Facilities, respectively.
All borrowings under the FFB Credit FacilityFacilities are full recourse to the Company,Georgia Power, and the CompanyGeorgia Power is obligated to reimburse the DOE for any payments the DOE is required to make to the FFB under theits guarantee. The Company'sGeorgia Power's reimbursement obligations to the DOE are full recourse and secured by a first priority lien on (i) the Company's 45.7%Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units, under construction, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) the Company'sGeorgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. There are no restrictions on the Company'sGeorgia Power's ability to grant liens on other property.
In addition to the conditions described above, future advances are subject to satisfaction of customary conditions, as well as certification of compliance with the requirements of the Title XVII Loan Guarantee Program, including accuracy of project-related representations and warranties, delivery of updated project-related information, and evidence of compliance with the prevailing wage requirements of the Davis-Bacon Act of 1931, as amended, and certification from the DOE's consulting engineer that proceeds of the advances are used to reimburse Eligible Project Costs.
Upon satisfaction of all conditions described above, advances may be requested under the FFB Credit Facility on a quarterly basis through 2020. The final maturity date for each advance under the FFB Credit FacilityFacilities is February 20, 2044. Interest is payable quarterly and principal payments will begin on February 20,began in 2020. BorrowingsEach borrowing under the FFB Credit Facility will bearFacilities bears interest at a fixed rate equal to the applicable U.S. Treasury rate at the time of the borrowing plus a spread equal to 0.375%.
At both December 31, 2017Under the Amended and 2016, the Company had $2.6 billion of borrowings outstanding under the FFB Credit Facility.
Under theRestated Loan Guarantee Agreement, the CompanyGeorgia Power is subject to customary borrower affirmative and negative covenants and events of default. In addition, the CompanyGeorgia Power is subject to project-related reporting requirements and other project-specific covenants and events of default.
In the event certain mandatory prepayment events occur, the FFB's commitment to make further advances under the FFB Credit Facility will terminate and the CompanyGeorgia Power will be required to prepay the outstanding principal amount of all borrowings under the FFB Credit FacilityFacilities over a period of five years (with level principal amortization). Among other things, these mandatory prepayment events include (i) the termination of the Vogtle Services Agreement or rejection of the Vogtle Services Agreement in any Westinghouse bankruptcy if the CompanyGeorgia Power does not maintain access to intellectual property rights under the IP Licenses;related intellectual property licenses; (ii) a decisiontermination of the Bechtel Agreement by the Company not to continue construction of Plant Vogtle Units 3 and 4; (iii)Bechtel or in connection with a cancellation of Plant Vogtle Units 3 and 4, unless the Vogtle Owners enter into a replacement agreement; (iii) cancellation of Plant Vogtle Unit 4 by the Georgia PSC or by Georgia Power; (iv) failure of the Company if authorized byholders of 90% of the Georgia PSC;ownership interests in Plant Vogtle Units 3 and (iv)4 to vote to continue construction following certain schedule extensions; (v) cost disallowances by the Georgia PSC that could have a material adverse effect on completion of Plant Vogtle Units 3 andUnit 4 or the Company'sGeorgia Power's ability to repay the outstanding borrowings under the FFB Credit Facility. Facilities; or (vi) loss of or failure to receive necessary regulatory approvals.
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Under certain circumstances, insurance proceeds and any proceeds from an event of taking must be applied to immediately prepay outstanding borrowings under the FFB Credit Facility. In addition, if the Company discontinues construction of Plant Vogtle Units 3 and 4, the Company would be obligated to immediately repay a portion of the outstanding borrowings under the FFB Credit Facility to the extent such outstanding borrowings exceed 70% of Eligible Project Costs, net of the proceeds received by the Company under the Guarantee Settlement Agreement. The CompanyFacilities. Georgia Power also may

NOTES (continued)
Georgia Power Company 2017 Annual Report

voluntarily prepay outstanding borrowings under the FFB Credit Facility.Facilities. Under the FFB Credit Facility,Facilities, any prepayment (whether mandatory or optional) will be made with a make-whole premium or discount, as applicable.
In connection with any cancellation of Plant Vogtle Units 3 andUnit 4, that results in a mandatory prepayment event, the DOE may elect to continue construction of Plant Vogtle Units 3 andUnit 4. In such an event, the DOE will have the right to assume the Company'sGeorgia Power's rights and obligations under the principal agreements relating to Plant Vogtle Units 3 and 4 and to acquire all or a portion of the Company'sGeorgia Power's ownership interest in Plant Vogtle Units 3 and 4.
See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
Secured Debt
Each of Southern Company's subsidiaries is organized as a legal entity, separate and apart from Southern Company and its other subsidiaries. There are no agreements or other arrangements among the Southern Company system companies under which the assets of one company have been pledged or otherwise made available to satisfy obligations of Southern Company or any of its other subsidiaries.
As discussed under "Long-term Debt" herein, the Registrants had secured debt outstanding at December 31, 2023 and 2022. Each Registrant's senior notes, junior subordinated notes, revenue bond obligations, bank term loans, credit facility borrowings, and notes payable are effectively subordinated to all secured debt of each respective Registrant.
Equity Units
In May 2022, Southern Company remarketed $862.5 million aggregate principal amount of its Series 2019A Remarketable Junior Subordinated Notes due August 1, 2024 (2019A RSNs) and $862.5 million aggregate principal amount of its Series 2019B Remarketable Junior Subordinated Notes due August 1, 2027 (2019B RSNs), pursuant to the terms of its 2019 Series A Equity Units (Equity Units). In connection with the remarketing, the interest rates on the 2019A RSNs and the 2019B RSNs were reset to 4.475% and 5.113%, respectively, payable on a semi-annual basis. In August 2022, the proceeds were ultimately used to settle the purchase contracts entered into as part of the Equity Units and Southern Company issued approximately 25.2 million shares of common stock and received proceeds of $1.725 billion. At December 31, 2023 and 2022, the 2019A RSNs and the 2019B RSNs are included on Southern Company's consolidated balance sheets in long-term debt or, as applicable, securities due within one year.
Convertible Senior Notes
In February 2023, Southern Company issued $1.5 billion aggregate principal amount of Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes). In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option.
Interest on the Series 2023A Convertible Senior Notes is payable semiannually, which began on June 15, 2023. The Series 2023A Convertible Senior Notes will mature on December 15, 2025, unless earlier converted or repurchased, but are not redeemable at the option of Southern Company. The Series 2023A Convertible Senior Notes are direct, unsecured, and unsubordinated obligations of Southern Company, ranking equally with all of Southern Company's other unsecured and unsubordinated indebtedness from time to time outstanding, and are effectively subordinated to all secured indebtedness of Southern Company.
Holders may convert their Series 2023A Convertible Senior Notes at their option prior to the close of business on the business day preceding September 15, 2025, but only under the following circumstances:
during any calendar quarter (and only during such calendar quarter), if the last reported sale price of Southern Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day as determined by Southern Company;
during the five business day period after any 10 consecutive trading day period (Measurement Period) in which the trading price per $1,000 principal amount of Series 2023A Convertible Senior Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the common stock and the conversion rate on each such trading day; or
upon the occurrence of certain corporate events specified in the indenture governing the Series 2023A Convertible Senior Notes.
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On or after September 15, 2025, a holder may convert all or any portion of its Series 2023A Convertible Senior Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions.
Southern Company will settle conversions of the Series 2023A Convertible Senior Notes by paying cash up to the aggregate principal amount of the Series 2023A Convertible Senior Notes to be converted and paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at Southern Company's election, in respect of the remainder, if any, of Southern Company's conversion obligation in excess of the aggregate principal amount of the Series 2023A Convertible Senior Notes being converted. The Series 2023A Convertible Senior Notes are initially convertible at a rate of 11.8818 shares of common stock per $1,000 principal amount converted, which is approximately equal to $84.16 per share of common stock. The conversion rate will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), Southern Company will, in certain circumstances, increase the conversion rate by a number of additional shares of common stock for conversions in connection with the make-whole fundamental change.
Upon the occurrence of a fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), holders of the Series 2023A Convertible Senior Notes may require Southern Company to purchase all or a portion of their Series 2023A Convertible Senior Notes, in principal amounts equal to $1,000 or an integral multiple thereof, for cash at a price equal to 100% of the principal amount of the Series 2023A Convertible Senior Notes to be purchased plus any accrued and unpaid interest.
Bank Credit Arrangements
At December 31, 2023, committed credit arrangements with banks were as follows:
Expires
Company2024202520262028TotalUnused
Expires within
One Year
(in millions)
Southern Company parent(a)
$150 $— $— $1,850 $2,000 $1,998 $150 
Alabama Power— — 650 700 1,350 1,350 — 
Georgia Power— — — 1,750 1,750 1,726 — 
Mississippi Power— 125 150 — 275 275 — 
Southern Power(a)(b)
— — — 600 600 589 — 
Southern Company Gas(c)
100 — — 1,500 1,600 1,598 100 
SEGCO30 — — — 30 30 30 
Southern Company$280 $125 $800 $6,400 $7,605 $7,566 $280 
(a)Arrangement expiring in 2028 represents a $2.45 billion combined arrangement for Southern Company and Southern Power as borrowers. Pursuant to the combined facility, the allocations between Southern Company and Southern Power may be adjusted.
(b)Does not include Southern Power Company's $75 million and $100 million continuing letter of credit facilities for standby letters of credit, expiring in 2025 and 2026, respectively, of which $8 million and $7 million, respectively, was unused at December 31, 2023. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities.
(c)Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, Leaseswhich is the borrower of $800 million of the credit arrangement expiring in 2028. Southern Company Gas' committed credit arrangement expiring in 2028 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangement expiring in 2028, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower under a $100 million credit arrangement expiring in 2024. See "Structural Considerations" herein for additional information.
Assets acquired underThe bank credit arrangements require payment of commitment fees based on the unused portion of the commitments. Commitment fees average less than 1/4 of 1% for the Registrants and Nicor Gas. Subject to applicable market conditions, Southern Company and its subsidiaries expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, Southern Company and its subsidiaries may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
These bank credit arrangements, as well as the term loan arrangements of the Registrants, Nicor Gas, and SEGCO, contain covenants that limit debt levels and contain cross-acceleration provisions to other indebtedness (including guarantee obligations) that are restricted only to the indebtedness of the individual company. The cross-acceleration provisions to other indebtedness would trigger an event of default if the applicable borrower defaulted on indebtedness, the payment of which was then
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accelerated. Southern Company's, certain of Mississippi Power's, Southern Company Gas', and Nicor Gas' credit arrangements contain covenants that limit debt levels to 70% of total capitalization, as defined in the agreements, and the other subsidiaries' bank credit arrangements contain covenants that limit debt levels to 65% of total capitalization, as defined in the agreements. For purposes of these definitions, debt excludes junior subordinated notes and, in certain arrangements, other hybrid securities. Additionally, for Southern Company and Southern Power, for purposes of these definitions, debt excludes any project debt incurred by certain subsidiaries of Southern Power to the extent such debt is non-recourse to Southern Power and capitalization excludes the capital leasesstock or other equity attributable to such subsidiaries. At December 31, 2023, the Registrants, Nicor Gas, and SEGCO were in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowings.
A portion of the unused credit with banks is allocated to provide liquidity support to certain revenue bonds of the traditional electric operating companies and the commercial paper programs of the Registrants, Nicor Gas, and SEGCO. At December 31, 2023, outstanding variable rate demand revenue bonds of the traditional electric operating companies with allocated liquidity support totaled approximately $1.7 billion (comprised of approximately $818 million at Alabama Power, $819 million at Georgia Power, and $69 million at Mississippi Power). In addition, at December 31, 2023, Georgia Power had approximately $325 million of fixed rate revenue bonds outstanding that are recorded inrequired to be remarketed within the next 12 months. The variable rate demand revenue bonds and fixed rate revenue bonds required to be remarketed within the next 12 months are classified as long-term debt on the balance sheets as utility plant in service, and the related obligations are classified asa result of available long-term debt. committed credit.
At both December 31, 20172023 and 2016, the Company2022, Southern Power had a capital lease asset for its corporate headquarters building$106 million of $61 million, with accumulated depreciation at December 31, 2017 and 2016 of $39 million and $33 million, respectively. At December 31, 2017 and 2016, the capitalized lease obligation was $22 million and $28 million, respectively, with an annual interest rate of 7.9%. For ratemaking purposes, the Georgia PSC has allowed the lease payments in cost of service with no return on the capital lease asset. The difference between the depreciation and the lease payments allowed for ratemaking purposes is recovered as operating expenses as ordered by the Georgia PSC. The annual operating expense incurred for this capital lease was not material for any year presented.
At December 31, 2017 and 2016, the Company had capital lease assetscash collateral posted related to two PPAs withPPA requirements, which is included in other deferred charges and assets on Southern PowerPower's consolidated balance sheets.
Notes Payable
The Registrants, Nicor Gas, and SEGCO make short-term borrowings primarily through commercial paper programs that have the liquidity support of $144 millionthe committed bank credit arrangements described above under "Bank Credit Arrangements." Southern Power's subsidiaries are not parties or obligors to its commercial paper program. Southern Company Gas maintains commercial paper programs at Southern Company Gas Capital and $149 million, respectively, with accumulated amortization at December 31, 2017 and 2016Nicor Gas. Nicor Gas' commercial paper program supports working capital needs at Nicor Gas as Nicor Gas is not permitted to make money pool loans to affiliates. All of $29 million and $19 million, respectively. At December 31, 2017 and 2016, the related capitalized lease obligations were $132 million and $141 million, respectively. The annual interest rates rangeSouthern Company Gas' other subsidiaries benefit from 10% to 12% for these two capital lease PPAs. For ratemaking purposes, the Georgia PSC has included the capital lease asset amortization in cost of service and the interest in the Company's cost of debt.Southern Company Gas Capital's commercial paper program. See Note 1 under "Affiliate Transactions" and Note 7 under "Fuel and Purchased Power Agreements""Structural Considerations" herein for additional information.
Assets SubjectIn addition, Southern Company and certain of its subsidiaries have entered into various bank term loan agreements. Unless otherwise stated, the proceeds of these loans were used to Lienrepay existing indebtedness and for general corporate purposes, including working capital and, for the subsidiaries, their continuous construction programs.
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Commercial paper and short-term bank term loans are included in notes payable in the balance sheets. Details of short-term borrowings for the applicable Registrants were as follows:
Notes Payable at December 31, 2023Notes Payable at December 31, 2022
Amount
Outstanding
Weighted Average
Interest Rate
Amount
Outstanding
Weighted Average
Interest Rate
(in millions)(in millions)
Southern Company
Commercial paper$1,794 5.6 %$809 4.7 %
Short-term bank debt520 6.4 %1,800 5.0 %
Total$2,314 5.7 %$2,609 4.9 %
Alabama Power
Commercial paper$40 5.5 %$— — %
Georgia Power
Commercial paper$809 5.6 %$— — %
Short-term bank debt520 6.4 %1,600 5.0 %
Total$1,329 5.9 %$1,600 5.0 %
Southern Power
Commercial paper$138 5.5 %$225 4.7 %
Southern Company Gas
Commercial paper:
Southern Company Gas Capital$23 5.5 %$285 4.8 %
Nicor Gas392 5.5 %283 4.6 %
Short-term bank debt:
Nicor Gas  %200 4.9 %
Total$415 5.5 %$768 4.7 %
See "DOE Loan Guarantee Borrowings" above"Bank Credit Arrangements" herein for information regarding certain borrowings of the Companyon bank term loan covenants that are secured by a first priority lien on (i) the Company's 45.7% undivided ownership interest in Plant Vogtle Units 3limit debt levels and 4 (primarily the units under construction, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) the Company's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4.cross-acceleration or cross-default provisions.
See "Capital Leases" above for information regarding certain assets held under capital leases.
Outstanding ClassesMunicipal and Rural Associations Tariff
Mississippi Power provides wholesale electric service to Cooperative Energy, East Mississippi Electric Power Association, and the City of Capital StockCollins, all located in southeastern Mississippi, under a long-term, cost-based, FERC-regulated MRA tariff.
The Company currently has preferred stock, Class A preferred stock, preference stock,In 2017, Mississippi Power and common stock authorized. The Company has sharesCooperative Energy executed, and the FERC accepted, a Shared Service Agreement (SSA), as part of the MRA tariff, under which Mississippi Power and Cooperative Energy share in providing electricity to the Cooperative Energy delivery points under the tariff. In August 2022, the FERC accepted an amended SSA between Mississippi Power and Cooperative Energy, effective July 1, 2022, under which Cooperative Energy will continue to decrease its common stock outstanding. In October 2017,use of Mississippi Power's generation services under the Company redeemed all 1.8 million shares ($45 million aggregate liquidation amount) of its 6.125% Series Class A Preferred Stock and 2.25 millionshares ($225 millionaggregate liquidation amount) of its 6.50% Series 2007A Preference Stock. No shares of preferred stock, Class A preferred stock, or preference stock were outstanding at December 31, 2017.
Dividend Restrictions
The Company can only pay dividendsMRA tariff up to Southern Company out of retained earnings or paid-in-capital.
Bank Credit Arrangements
2.5% annually through 2035. At December 31, 2017,2023, Mississippi Power is serving approximately 390 MWs of Cooperative Energy's annual demand. Beginning in 2036, Cooperative Energy will provide 100% of its electricity requirements at the Company hadMRA delivery points under the tariff. Neither party has the option to cancel the amended SSA.
On October 27, 2023, the FERC approved a $1.75 billion committed credit arrangement with banks,settlement agreement filed by Mississippi Power and Cooperative Energy on July 31, 2023 related to Mississippi Power's July 2022 request for a $23 million increase in annual wholesale base revenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and a refund to customers of which $1.73 billion was unused. In May 2017,approximately $6 million primarily related to the Company amended its multi-year credit arrangement which, among other things, extendeddifference between the maturity date from 2020 to 2022.
This bank credit arrangement requires payment of commitment fees based on the unused portion of the commitments. Commitment fees average less than 1/4 of 1% for the Company.
This bank credit arrangement contains a covenant that limits the Company's debt levels to 65% of total capitalization, as defined in the agreement. For purposes of this definition, debt excludes certain hybrid securities. At December 31, 2017, the Company was in compliance with the debt limit covenant.
Subject to applicable market conditions, the Company expects to renew this bank credit arrangement, as needed, prior to expiration. In connection therewith, the Company may extend the maturity date and/or increase or decrease the lending commitments thereunder.approved rates and interim rates.
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Georgia Power Company 2017 Annual Report

Southern Company Gas
AUtility Regulation and Rate Design
The natural gas distribution utilities are subject to regulation and oversight by their respective state regulatory agencies. Rates charged to customers vary according to customer class (residential, commercial, or industrial) and rate jurisdiction. These agencies approve rates designed to provide the opportunity to generate revenues to recover all prudently-incurred costs, including a return on rate base sufficient to pay interest on debt and provide a reasonable ROE.
As a result of operating in a deregulated environment, Atlanta Gas Light earns revenue by charging rates to its customers based primarily on monthly fixed charges that are set by the Georgia PSC and adjusted periodically. The Marketers add these fixed charges when billing their respective customers. This mechanism, called a straight-fixed-variable rate design, minimizes the seasonality of Atlanta Gas Light's revenues since the monthly fixed charge is not volumetric or directly weather dependent.
With the exception of Atlanta Gas Light, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are largely a function of weather conditions and price levels for natural gas. Specifically, customer demand substantially increases during the Heating Season when natural gas is used for heating purposes. Southern Company Gas has various mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit exposure to weather changes within typical ranges in these utilities' respective service territories.
In addition to natural gas cost recovery mechanisms, other cost recovery mechanisms and regulatory riders, which vary by utility, allow recovery of certain costs, such as those related to infrastructure replacement programs as well as environmental remediation, energy efficiency plans, and bad debts. In traditional rate designs, utilities recover a significant portion of the $1.73 billion unused credit with banks is allocatedfixed customer service and pipeline infrastructure costs based on assumed natural gas volumes used by customers. With the exception of Chattanooga Gas, the natural gas distribution utilities have decoupled regulatory mechanisms that Southern Company Gas believes encourage conservation by separating the recoverable amount of these fixed costs from the amounts of natural gas used by customers. See "Rate Proceedings" herein for additional information. Also see "Infrastructure Replacement Programs and Capital Projects" herein for additional information regarding infrastructure replacement programs at certain of the natural gas distribution utilities.
The following table provides regulatory information for Southern Company Gas' natural gas distribution utilities:
Nicor GasAtlanta Gas LightVirginia Natural GasChattanooga Gas
Authorized ROE at December 31, 20239.51%10.25%9.70%9.80%
Weather normalization mechanisms(a)
üü
Decoupled, including straight-fixed-variable rates(b)
üüü
Regulatory infrastructure program rate(c)
üüüü
Bad debt rider(d)
üüü
Energy efficiency plan(e)
üü
Annual base rate adjustment mechanism(f)
üü
Year of last base rate case decision2023201920232018
(a)Designed to provide liquidity supporthelp stabilize operating results by allowing recovery of costs in the event of unseasonal weather, but are not direct offsets to the Company's pollution controlpotential impacts on earnings of weather and customer consumption.
(b)Allows for recovery of fixed customer service costs separately from assumed natural gas volumes used by customers and provides a benchmark level of revenue bondsfor recovery.
(c)See "Infrastructure Replacement Programs and commercial paperCapital Projects" herein for additional information. Chattanooga Gas' pipeline replacement program costs are recovered through its annual base rate review mechanism.
(d)The recovery (refund) of bad debt expense over (under) an established benchmark expense. The gas portion of bad debt expense is recovered through purchased gas adjustment mechanisms. Nicor Gas also has a rider to recover the non-gas portion of bad debt expense.
(e)Recovery of costs associated with plans to achieve specified energy savings goals.
(f)Regulatory mechanism allowing annual adjustments to base rates up or down based on authorized ROE and/or ROE range.
Infrastructure Replacement Programs and Capital Projects
In addition to capital expenditures recovered through base rates by each of the natural gas distribution utilities, Nicor Gas and Virginia Natural Gas have separate rate riders that provide timely recovery of capital expenditures for specific infrastructure replacement programs and Atlanta Gas Light has a separate rate rider that provides for the timely recovery of capital expenditures for a specific reinforcement capital program. Total capital expenditures incurred during 2023 for all gas distribution operations were $1.6 billion.
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The amount of variable rate pollution control revenue bonds outstanding requiring liquidity support as of December 31, 2017 was $550 million as compared to $868 millionfollowing table and discussions provide updates on the infrastructure replacement programs and capital projects at the natural gas distribution utilities at December 31, 2016.2023. These programs are risk-based and designed to update and replace cast iron, bare steel, and mid-vintage plastic materials or expand Southern Company Gas' distribution systems to improve reliability and meet operational flexibility and growth.
UtilityProgramRecoveryCapital Expenditures in 2023Capital Expenditures Since Project InceptionPipe
Installed Since
Project Inception
Scope of
Program
Program DurationLast
Year of Program
(in millions)(miles)(miles)(years)
Nicor Gas
Investing in Illinois Qualifying Infrastructure Plant(*)
Rider$365 $3,228 1,367 1,367 92023
Virginia Natural GasSAVERider75 486 567 695 132024
Atlanta Gas LightSystem Reinforcement RiderRider104 180 20 N/A32024
Chattanooga GasPipeline Replacement ProgramRate Base16 15 73 72027
Total$553 $3,910 1,969 2,135 
(*)Included replacement of pipes, compressors, and transmission mains along with other improvements such as new meters. This program ended November 30, 2023 with all expenditures placed in service. Recovery of program costs is described under "Nicor Gas" herein.
Nicor Gas
Illinois legislation allows Nicor Gas to provide more widespread safety and reliability enhancements to its distribution system through 2023 and stipulates that rate increases to customers as a result of any infrastructure investments shall not exceed a cumulative annual average of 4.0% or, in any given year, 5.5% of base rate revenues. In addition,2014, the Illinois Commission approved the nine-year regulatory infrastructure program, Investing in Illinois, which concluded in 2023 and is subject to annual review, as discussed further below. In accordance with orders from the Illinois Commission, Nicor Gas recovers program costs incurred through a separate rider and base rates. See "Rate Proceedings – Nicor Gas" herein for additional information.
On June 15, 2023, the Illinois Commission concluded its review of the Qualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the second quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an $8 million reduction to revenues and $30 million in estimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a rehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
The following table provides a summary of QIP capital investments during the nine-year program:
Year Status of QIP Annual Review ProceedingCapital InvestmentsDisallowedMonth of Disallowance
(in millions)
2015 – 2018Complete$1,246 $— 
2019
Complete(a)
415 32 June 2023
2020Filed March 2021402 (b)
2021Filed March 2022392 (b)
2022Filed March 2023408 (b)(a)(c)November 2023
2023To be filed by March 20, 2024365 (b)25 (a)(c)November 2023
$3,228 $63 
(a)Appealed to the Illinois Appellate Court.
(b)Capital investments are subject to the required QIP annual review proceeding; years 2020 through 2022 are pending with the Illinois Commission.
(c)Disallowed in Nicor Gas' 2023 general base rate case proceeding. See "Rate Proceedings – Nicor Gas" herein for additional information regarding the Illinois Commission's disallowance of certain capital investments.
Any further cost disallowances by the Illinois Commission in the pending cases could be material to the financial statements of Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time.
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Virginia Natural Gas
The SAVE program, an accelerated infrastructure replacement program, allows Virginia Natural Gas to continue replacing aging pipeline infrastructure through 2024. The program includes authorized annual investments of $60 million in 2021 and $70 million in each year from 2022 through 2024, with a total potential variance of up to $5 million allowed for the program, for a maximum total investment over the six-year term (2019 through 2024) of $365 million.
On February 9, 2024, Virginia Natural Gas filed with the Virginia Commission a request to extend the existing SAVE program through 2029. The request includes investments of $70 million in each year from 2025 through 2029, with a potential variance of up to $5 million allowed for the program, for a maximum total investment over the five-year extension (2025 through 2029) of $355 million. Virginia Natural Gas expects the Virginia Commission to issue a final order on this matter in the second quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
The SAVE program is subject to annual review by the Virginia Commission. In accordance with the base rate case approved by the Virginia Commission in 2023, Virginia Natural Gas is recovering program costs incurred prior to January 1, 2023 through base rates. Program costs incurred subsequent to January 1, 2023 are currently being recovered through a separate rider and are subject to future base rate case proceedings. See "Rate Proceedings – Virginia Natural Gas" herein for additional information.
Atlanta Gas Light
In 2019, the Georgia PSC approved the continuation of GRAM as part of Atlanta Gas Light's 2019 rate case order. Various infrastructure programs previously authorized by the Georgia PSC, including the Integrated Vintage Plastic Replacement Program to replace aging plastic pipe and the Integrated System Reinforcement Program to upgrade Atlanta Gas Light's distribution system and LNG facilities in Georgia, continue under GRAM and the recovery of and return on the infrastructure program investments are included in annual base rate adjustments. The amounts to be recovered through rates related to allowed, but not incurred, costs have been quantified as an unrecognized ratemaking amount that is not reflected on the balance sheets. These allowed costs are primarily the equity return on the capital investment under the infrastructure programs in place prior to GRAM and are being recovered through GRAM and base rates until the earlier of the full recovery of such amounts or December 31, 2025. The under recovered balance at December 31, 2017, the Company had $4692023 was $44 million, including $23 million of pollution control revenue bonds outstanding that were requiredunrecognized equity return, and is expected to be remarketed withinrecovered by December 31, 2025. The Georgia PSC reviews Atlanta Gas Light's performance annually under GRAM. See "Unrecognized Ratemaking Amounts" herein for additional information.
Atlanta Gas Light and the staff of the Georgia PSC previously agreed to a variation of the Integrated Customer Growth Program to extend pipeline facilities to serve customers in areas without pipeline access and create new economic development opportunities in Georgia. A separate tariff provides recovery of up to $15 million annually for strategic economic development projects approved by the Georgia PSC.
See "Rate Proceedings – Atlanta Gas Light" herein for additional information regarding the Georgia PSC's 2021 approval of Atlanta Gas Light's GRAM filing and Integrated Capacity and Delivery Plan. The Georgia PSC also approved a new System Reinforcement Rider for authorized large pressure improvement and system reliability projects, which is expected to recover related capital investments totaling $286 million for the years 2022 through 2024, of which $104 million and $76 million was incurred in 2023 and 2022, respectively.
Chattanooga Gas
In 2021, the Tennessee Public Utilities Commission approved Chattanooga Gas' pipeline replacement program to replace approximately 73 miles of distribution main over a seven-year period. The estimated total cost of the program is $118 million, which will be recovered through Chattanooga Gas' annual base rate review mechanism.
Natural Gas Cost Recovery
With the exception of Atlanta Gas Light, the natural gas distribution utilities are authorized by the relevant regulatory agencies in the states in which they serve to use natural gas cost recovery mechanisms that adjust rates to reflect changes in the wholesale cost of natural gas and ensure recovery of all costs prudently incurred in purchasing natural gas for customers. The natural gas distribution utilities defer or accrue the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred natural gas costs are reflected as regulatory assets and accrued natural gas costs are reflected as regulatory liabilities. Natural gas costs generally do not have a significant effect on Southern Company's or Southern Company Gas' net income, but could have a significant effect on cash flows. Since Atlanta Gas Light does not sell natural gas directly to its end-use customers, it does not utilize a traditional natural gas cost recovery mechanism. However, Atlanta Gas Light does maintain natural gas inventory for the Marketers in Georgia and recovers the cost through recovery mechanisms approved by the Georgia PSC. At December 31, 2023, the over recovered balance was $214 million, which was included in
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natural gas cost over recovery on Southern Company's and Southern Company Gas' balance sheets. At December 31, 2022, the under recovered balance was $108 million, which was included in natural gas cost under recovery on Southern Company's and Southern Company Gas' balance sheets.
Rate Proceedings
Nicor Gas
In 2021, the Illinois Commission approved a $240 million annual base rate increase, which became effective November 24, 2021. The base rate increase included $94 million related to the recovery of program costs under the Investing in Illinois program and was based on a ROE of 9.75% and an equity ratio of 54.5%.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and an equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to be completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the fourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be postponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. See "Infrastructure Replacement Programs and Capital Projects – Nicor Gas" herein for additional information regarding the Illinois Commission's disallowance of certain capital investments. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined in the Illinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to the Illinois Commission's rate case ruling. The ultimate outcome of this matter cannot be determined at this time.
Atlanta Gas Light
The Georgia PSC evaluates Atlanta Gas Light's earnings against a ROE range of 10.05% to 10.45%, with disposition of any earnings above 10.45% to be determined by the Georgia PSC. Additionally, the Georgia PSC allows inclusion in base rates of the recovery of and return on the infrastructure program investments, including, but not limited to, GRAM adjustments. GRAM filing rate adjustments are based on an authorized ROE of 10.25%. GRAM adjustments for 2021 could not exceed 5% of 2020 base rates. The 5% limitation does not set a precedent in any future rate proceedings by Atlanta Gas Light.
In April 2021, Atlanta Gas Light filed its Integrated Capacity and Delivery Plan (i-CDP) with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the next 12 months.10 years (2022 through 2031), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected capital investments totaling approximately $0.5 billion to $0.6 billion annually.
In November 2021, the Georgia PSC approved a stipulation agreement between Atlanta Gas Light and the staff of the Georgia PSC, under which, for the years 2022 through 2024, Atlanta Gas Light will incrementally reduce its combined GRAM and System Reinforcement Rider request by 10% through Atlanta Gas Light's GRAM mechanism, which resulted in a reduction of $5 million for 2022, $7 million for 2023, and $9 million for 2024. The stipulation agreement also provided for $1.7 billion of total capital investment for the years 2022 through 2024.
In November 2021, December 2022, and December 2023, the Georgia PSC approved Atlanta Gas Light's annual GRAM filings, which resulted in an annual rate increase of $43 million effective January 1, 2022, an annual rate increase of $53 million effective January 1, 2023, and an annual rate increase of $53 million effective January 1, 2024, respectively.
On February 1, 2024, Atlanta Gas Light filed its triennial i-CDP with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2025 through 2034), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected capital investments totaling approximately
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$0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order on this matter in the third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Virginia Natural Gas
In 2021, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' 2020 general rate case filing, which allowed for a $43 million increase in annual base rate revenues, including $14 million related to the recovery of investments under the SAVE program, based on a ROE of 9.5% and an equity ratio of 51.9%. Interim rates became effective as of November 1, 2020, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $50 million. Refunds to customers related to the difference between the approved rates effective October 1, 2021 and the interim rates were completed during the fourth quarter 2021.
On August 28, 2023, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for a $48 million increase in annual base rate revenues based on a ROE of 9.70% and an equity ratio of 49.06%. Interim rates became effective as of January 1, 2023, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $69 million. Refunds to customers related to the difference between the approved rates effective September 1, 2023 and the interim rates were completed during the fourth quarter 2023.
Unrecognized Ratemaking Amounts
The following table illustrates Southern Company makes short-term borrowings primarily through a commercial paper programGas' authorized ratemaking amounts that has the liquidity support of the Company's committed bank credit arrangement described above. Commercial paper is included in notes payable in the balance sheets.
Details of short-term borrowings outstanding were as follows:
 Short-term Debt at the End of the Period
 Amount Outstanding Weighted Average Interest Rate
 (in millions)  
December 31, 2017:   
Short-term bank debt$150
 2.2%
December 31, 2016:   
Commercial paper$392
 1.1%
7. COMMITMENTS
Fuel and Purchased Power Agreements
To supply a portion of the fuel requirements of its generating plants, the Company has entered into various long-term commitments for the procurement and delivery of fossil and nuclear fuel which are not recognized on theits balance sheets. In 2017, 2016, and 2015,These amounts are primarily comprised of an allowed equity rate of return on assets associated with certain regulatory infrastructure programs. These amounts will be recognized as revenues in Southern Company Gas' financial statements in the Company incurred fuel expense of $1.7 billion, $1.8 billion, and $2.0 billion, respectively,periods they are billable to customers, the majority of which was purchasedwill be recovered by 2025.
December 31, 2023December 31, 2022
(in millions)
Atlanta Gas Light$23 $35 
Virginia Natural Gas10 10 
Chattanooga Gas7 
Nicor Gas3 
Total$43 $50 
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3. CONTINGENCIES, COMMITMENTS, AND GUARANTEES
General Litigation Matters
The Registrants are involved in various matters being litigated and regulatory matters. The ultimate outcome of such pending or potential litigation or regulatory matters against each Registrant and any subsidiaries cannot be determined at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on such Registrant's financial statements.
The Registrants intend to dispute the allegations raised in and vigorously defend against the pending legal challenges discussed below; however, the ultimate outcome of these matters cannot be determined at this time.
Southern Company and Mississippi Power
In 2010, the DOE, through a cooperative agreement with SCS, agreed to fund $270 million of the Kemper County energy facility through the grants awarded to the project by the DOE under long-term commitments. The Company expects that a substantialthe Clean Coal Power Initiative Round 2. In 2016, additional DOE grants in the amount of $137 million were awarded to the Kemper County energy facility. In 2018, Mississippi Power filed with the DOE its request for property closeout certification under the contract related to the $387 million of total grants received. In 2020, Mississippi Power and Southern Company executed an agreement with the DOE completing Mississippi Power's request, which enabled Mississippi Power to proceed with full dismantlement of the abandoned gasifier-related assets and site restoration activities. In connection with the DOE closeout discussions, in 2019, the Civil Division of the Department of Justice informed Southern Company and Mississippi Power of a civil investigation related to the DOE grants. On August 4, 2023, the U.S. District Court for the Northern District of Georgia unsealed a civil action in which defendants Southern Company, SCS, and Mississippi Power are alleged to have violated certain provisions of the False Claims Act by fraudulently inducing the DOE to disburse funds pursuant to the grants. The federal government declined to intervene in the action. On October 30, 2023, the plaintiff, a former SCS employee, filed an amended complaint, again alleging certain violations of the False Claims Act. The plaintiff seeks to recover all damages incurred personally and on behalf of the government caused by the defendants' alleged violations, as well as treble damages and attorneys' fees, among other relief. The ultimate outcome of this matter cannot be determined at this time; however, an adverse outcome could have a material impact on Southern Company's and Mississippi Power's financial statements.
Alabama Power
In September 2022, Mobile Baykeeper filed a citizen suit in the U.S. District Court for the Southern District of Alabama alleging that Alabama Power's plan to close the Plant Barry ash pond utilizing a closure-in-place methodology violates the Resource Conservation and Recovery Act (RCRA) and regulations governing CCR. Among other relief requested, Mobile Baykeeper sought a declaratory judgment that the RCRA and regulations governing CCR were being violated, preliminary and injunctive relief to prevent implementation of Alabama Power's closure plan and the development of a closure plan that satisfies regulations governing CCR requirements. In December 2022, Alabama Power filed a motion to dismiss the case. On January 4, 2024, the lawsuit was dismissed without prejudice by the U.S. District Court judge. On February 1, 2024, the plaintiff filed a motion to reconsider.
On January 31, 2023, the EPA issued a Notice of Potential Violations associated with Alabama Power's plan to close the Plant Barry ash pond. Alabama Power has affirmed to the EPA its position that it is in compliance with CCR requirements. The ultimate outcome of this matter cannot be determined at this time but could have a material impact on Alabama Power's ARO estimates and cash flows.
See Note 6 for a discussion of Alabama Power's ARO liabilities.
Georgia Power
In July 2020, a group of individual plaintiffs filed a complaint, which was amended in December 2022, in the Superior Court of Fulton County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer has impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages, a medical monitoring fund, and injunctive relief. In December 2022, the Superior Court of Fulton County, Georgia granted Georgia Power's motion to transfer the case to the Superior Court of Monroe County, Georgia. On May 9, 2023, the Superior Court of Monroe County, Georgia denied Georgia Power's motion to dismiss the case for lack of subject matter jurisdiction. On July 27, 2023, the Superior Court of Monroe County, Georgia denied the remaining motions to dismiss certain claims and plaintiffs that Georgia Power filed at the outset of the case.
In October 2021, February 2022, and January 2023, a total of eight additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that releases from Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs sought an unspecified amount of monetary damages
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including punitive damages. After Georgia Power removed these cases to the U.S. District Court for the Middle District of Georgia, the plaintiffs voluntarily dismissed their complaints without prejudice in November 2022 and January 2023. On May 12, 2023, the plaintiffs in the cases originally filed in October 2021, February 2022, and January 2023 refiled their eight complaints in the Superior Court of Monroe County, Georgia. Also on May 12, 2023, a new complaint was filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries. The plaintiff seeks an unspecified amount of monetary damages, including punitive damages. On May 18, 2023, Georgia Power removed all of these cases to the U.S. District Court for the Middle District of Georgia. The plaintiffs are requesting the court remand the cases back to the Superior Court of Monroe County, Georgia.
The amount of possible loss, if any, from these matters cannot be estimated at this time.
Mississippi Power
In 2018, Ray C. Turnage and 10 other individual plaintiffs filed a putative class action complaint against Mississippi Power and the three then-serving members of the Mississippi PSC in the U.S. District Court for the Southern District of Mississippi, which was amended in March 2019 to include four additional plaintiffs. Mississippi Power received Mississippi PSC approval in 2013 to charge a mirror CWIP rate premised upon including in its rate base pre-construction and construction costs for the Kemper IGCC prior to placing the Kemper IGCC into service. The Mississippi Supreme Court reversed that approval and ordered Mississippi Power to refund the amounts paid by customers under the previously-approved mirror CWIP rate. The plaintiffs allege that the initial approval process, and the amount approved, were improper and make claims for gross negligence, reckless conduct, and intentional wrongdoing. They also allege that Mississippi Power underpaid customers by up to $23.5 million in the refund process by applying an incorrect interest rate. The plaintiffs seek to recover, on behalf of themselves and their putative class, actual damages, punitive damages, pre-judgment interest, post-judgment interest, attorney's fees, and costs. The district court dismissed the amended complaint; however, in March 2020, the plaintiffs filed a motion seeking to name the new members of the Mississippi PSC, the Mississippi Development Authority, and Southern Company as additional defendants and add a cause of action against all defendants based on a dormant commerce clause theory under the U.S. Constitution. In July 2020, the plaintiffs filed a motion for leave to file a third amended complaint, which included the same federal claims as the proposed second amended complaint, as well as several additional state law claims based on the allegation that Mississippi Power failed to disclose the annual percentage rate of interest applicable to refunds. In November 2020, the district court denied each of the plaintiffs' pending motions and entered final judgment in favor of Mississippi Power. In January 2021, the district court denied further motions by the plaintiffs to vacate the judgment and to file a revised second amended complaint. In February 2021, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fifth Circuit. In March 2022, the U.S. Court of Appeals for the Fifth Circuit issued an opinion affirming the dismissal of the claims against the Mississippi PSC defendants but reversing the dismissal of the claims against Mississippi Power. In May 2022, the U.S. Court of Appeals for the Fifth Circuit denied a petition by Mississippi Power for a rehearing en banc and remanded the case to the U.S. District Court for the Southern District of Mississippi for further proceedings. In June 2022, Mississippi Power filed with the trial court a motion to dismiss the complaint with prejudice, which was granted on March 15, 2023. On March 28, 2023, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fifth Circuit. On December 14, 2023, the U.S. Court of Appeals for the Fifth Circuit affirmed the district court's order dismissing the plaintiffs' complaint against Mississippi Power. On December 28, 2023, the plaintiffs filed a petition for panel rehearing, which was denied on January 10, 2024. The plaintiffs have until April 9, 2024 to file a petition for writ of certiorari with the U.S. Supreme Court. The ultimate outcome of this matter cannot be determined at this time.
Southern Power
In July 2021, Southern Power and certain of its subsidiaries filed an arbitration demand with the American Arbitration Association against First Solar Electric, LLC (First Solar) for defective design of actuators on trackers and inverters installed by First Solar under the engineering, procurement, and construction agreements associated with five solar projects owned by Southern Power and partners and managed by Southern Power. In February 2023, arbitration hearings concluded. In July 2023, an interim award of approximately $36 million was entered in favor of Southern Power and was subsequently received in September 2023. The interim award included $18 million representing recovery of losses associated with replacement costs, penalty payments, and lost revenues previously incurred. This recovery is reflected in Southern Power's 2023 statement of income as an $11 million reduction to other operations and maintenance expense and a $7 million increase in other revenues, with $6 million allocated through noncontrolling interests to Southern Power's partners. The remaining $18 million in award proceeds received in excess of the losses incurred is recognized on the balance sheet at December 31, 2023 as restricted cash and a liability to fund future fuel needs will continuereplacement costs. In November 2023, the final award was issued and Southern Power filed for confirmation of the final award in the Delaware Court of Chancery. In December 2023, First Solar filed a motion to dismiss the confirmation and, in February 2024, filed a petition to vacate the arbitration award in the Supreme Court of New York County, New York. The ultimate outcome of this matter cannot be determined at this time.
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Environmental Remediation
The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and the natural gas distribution utilities conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in the financial statements. A liability for environmental remediation costs is recognized only when a loss is determined to be purchasedprobable and reasonably estimable and is reduced as expenditures are incurred. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia have each received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. Any difference between the liabilities accrued and costs recovered through rates is deferred as a regulatory asset or liability. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies.
Georgia Power has been designated or identified as a potentially responsible party at sites governed by the Georgia Hazardous Site Response Act and/or by the federal Comprehensive Environmental Response, Compensation, and Liability Act, and assessment and potential cleanup of such sites is expected. For 2023, 2022, and 2021, Georgia Power recovered approximately $5 million, $12 million, and $12 million, respectively, through the ECCR tariff for environmental remediation.
Southern Company Gas is subject to environmental remediation liabilities associated with 40 former manufactured gas plant sites in four different states. Southern Company Gas' accrued environmental remediation liability at December 31, 2023 and 2022 was based on the estimated cost of environmental investigation and remediation associated with these sites.
At December 31, 2023 and 2022, the environmental remediation liability and the balance of under long-term commitments.
The Company has commitments regarding a portion of a 5% interestrecovered environmental remediation costs were reflected in the original costbalance sheets of PlantSouthern Company, Georgia Power, and Southern Company Gas as shown in the table below. Alabama Power and Mississippi Power did not have environmental remediation liabilities at December 31, 2023 or 2022.
Southern CompanyGeorgia
Power
Southern Company Gas
(in millions)
December 31, 2023:
Environmental remediation liability:
Other current liabilities$44 $14 $30 
Accrued environmental remediation192 — 192 
Under recovered environmental remediation costs:
Other regulatory assets, current$45 $$40 
Other regulatory assets, deferred210 15 195 
December 31, 2022:
Environmental remediation liability:
Other current liabilities$65 $15 $49 
Accrued environmental remediation207 — 207 
Under recovered environmental remediation costs:
Other regulatory assets, current$59 $$54 
Other regulatory assets, deferred235 20 215 
The ultimate outcome of these matters cannot be determined at this time; however, as a result of the regulatory treatment for environmental remediation expenses described above, the final disposition of these matters is not expected to have a material impact on the financial statements of the applicable Registrants.
Nuclear Fuel Disposal Costs
Acting through the DOE and pursuant to the Nuclear Waste Policy Act of 1982, the U.S. government entered into contracts with Alabama Power and Georgia Power that required the DOE to take title to and dispose of spent nuclear fuel generated at Plants Farley, Hatch, and Vogtle Units 1 and 2 owned by MEAGbeginning no later than January 31, 1998. The DOE has yet to commence performance of
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its contractual and statutory obligation to dispose of spent nuclear fuel. Consequently, Alabama Power that areand Georgia Power pursued and continue to pursue legal remedies against the U.S. government for its partial breach of contract.
In 2014, Alabama Power and Georgia Power filed their third round of lawsuits against the U.S. government in effect until the latterCourt of Federal Claims, seeking damages for the retirementcosts of the plant or the latest stated maturity date of MEAG Power's bonds issuedcontinuing to finance such ownership interest. The payments for capacity are required whether or not any capacity is available. The energy cost is a function of each unit's variable operating costs. Portions of the capacity payments relate to costs in excess of MEAG Power's Plantstore spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 allowed investment for ratemaking purposes.the period from January 1, 2011 through December 31, 2013. The present valuedamage period was subsequently extended to December 31, 2014. In 2019, the Court of these portions atFederal Claims granted Alabama Power's and Georgia Power's motion for summary judgment on damages not disputed by the timeU.S. government, awarding those undisputed damages to Alabama Power and Georgia Power. However, those undisputed damages are not collectible until the court enters final judgment on the remaining damages.
In 2017, Alabama Power and Georgia Power filed their fourth round of lawsuits against the disallowance was written off. Generally, the cost of such capacity and energy is included in purchased power, non-affiliatesU.S. government in the statementsCourt of income. Capacity payments totaled $9 million, $11Federal Claims, seeking damages for the costs of continuing to store spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 for the period from January 1, 2015 through December 31, 2017. In 2020, Alabama Power and Georgia Power filed amended complaints in those fourth-round lawsuits adding damages incurred from January 1, 2018 to December 31, 2019 to the claim period.
The outstanding claims for the period January 1, 2011 through December 31, 2019 total $106 million and $10$128 million in 2017, 2016, for Alabama Power and 2015, respectively.

NOTES (continued)
Georgia Power Company 2017 Annual Report

The Company has also entered into various long-term PPAs, some of which are accounted for as capital or operating leases. Total capacity expense under PPAs accounted for as operating leases was $199 million, $217 million, and $203 million for 2017, 2016, and 2015, respectively. Contingent rent expense under energy-only solar PPAs of $73 million, $39 million, and $8 million for 2017, 2016, and 2015, respectively, was recognized as services were performed. Estimated total long-term obligations at December 31, 2017 were as follows:
 Affiliate Capital Leases Affiliate Operating Leases 
Non-Affiliate
Operating
Leases
 
Vogtle
Units 1 and 2
Capacity
Payments
 Total
 (in millions)
2018$23
 $62
 $127
 $7
 $219
201923
 63
 128
 6
 220
202023
 65
 124
 4
 216
202124
 66
 125
 5
 220
202224
 67
 126
 4
 221
2023 and thereafter182
 412
 773
 38
 1,405
Total$299
 $735
 $1,403
 $64
 $2,501
Less: amounts representing executory costs(a)
45
        
Net minimum lease payments254
        
Less: amounts representing interest(b)
120
        
Present value of net minimum lease payments$134
        
(a)
Executory costs such as taxes, maintenance, and insurance (including the estimated profit thereon) are estimated and included in total minimum lease payments.
(b)Calculated using an adjusted incremental borrowing rate to reduce the present value of the net minimum lease payments to fair value.
SCS may enter into various types of wholesale energy and natural gas contracts acting as an agent for the Company and all of the other traditional electric operating companies and Southern Power. Under these agreements, each of the traditional electric operating companies and Southern Power may be jointly and severally liable. Accordingly, Southern Company has entered into keep-well agreements with the Company and each of the other traditional electric operating companies to ensure the Company will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of Southern Power as a contracting party under these agreements.
Operating Leases
The Company has entered into operating leases with Southern Linc and third parties for the use of cellular tower space. Substantially all of these agreements have initial terms ranging from five to 10 years and renewal options of up to 20 years. The Company has also entered into rental agreements for facilities, railcars, and other equipment with various terms and expiration dates. Total rent expense was $31 million, $28 million, and $29 million for 2017, 2016, and 2015(based on its ownership interests), respectively. The Company includes any step rents, fixed escalations,Damages will continue to accumulate until the issue is resolved, the U.S. government disposes of Alabama Power's and lease concessionsGeorgia Power's spent nuclear fuel pursuant to its contractual obligations, or alternative storage is otherwise provided. No amounts have been recognized in its computation of minimum lease payments.

NOTES (continued)
Georgia Power Company 2017 Annual Report

Asthe financial statements as of December 31, 2017, estimated minimum lease payments under operating leases were as follows:2023 for any potential recoveries from the pending lawsuits.
 Minimum Lease Payments
 
Affiliate Operating Leases(a)
 
Non-Affiliate Operating Leases (b)
 Total
 (in millions)
2018$10
 $14
 $24
201911
 11
 22
202011
 9
 20
20219
 8
 17
20228
 6
 14
2023 and thereafter33
 11
 44
Total$82
 $59
 $141
(a)Includes operating leases for cellular tower space.
(b)Includes operating leases for cellular tower space, facilities, railcars, and other equipment.
Railcar minimum lease payments are disclosed at 100% of railcar lease obligations; however, a portionThe final outcome of these obligations is shared with the joint owners of Plants Scherer and Wansley. A majority of the rental expenses related to the railcar leases are recoverable through the fuel cost recovery clause as ordered by the Georgia PSC and the remaining portion is recovered through base rates.
In addition to the above rental commitments, the Company has obligations upon expiration of certain railcar leases with respect to the residual value of the leased property. These leases have terms expiring through 2024 with maximum obligations under these leases of $32 million. At the termination of the leases, the Company may either renew the lease, exercise its purchase option, or the property canmatters cannot be sold to a third party. The Company expects that the fair market value of the leased property would reduce the Company's payments under the residual value obligations.
Guarantees
determined at this time. However, Alabama Power has guaranteed the obligations of SEGCO for $25 million of pollution control revenue bonds issued in 2001, which mature in June 2019, and also $100 million of senior notes issued in 2013, which mature in December 2018. The Company has agreedGeorgia Power expect to reimburse Alabama Powercredit any recoveries for the pro rata portionbenefit of such obligations corresponding to the Company's then proportionate ownership of SEGCO's stock if Alabama Power is called upon to make such payment under its guarantee. See Note 4 for additional information.
In addition,customers in 2013, the Company entered into an agreement that requires the Company to guarantee certain payments of a gas supplier for Plant McIntosh for a period up to 15 years. The guarantee is expected to be terminated if certain events occur within one year of the initial gas deliveries in 2018. In the event the gas supplier defaults on payments, the maximum potential exposure under the guarantee is approximately $43 million.
As discussed earlier in this Note under "Operating Leases," the Company has entered into certain residual value guarantees related to railcar leases.
8. STOCK COMPENSATION
Stock-Based Compensation
Stock-based compensation primarily in the form of Southern Company performance share units and restricted stock units may be granted through the Omnibus Incentive Compensation Plan to a large segment of the Company's employees rangingaccordance with direction from line management to executives. In 2015 and 2016, stock-based compensation consisted exclusively of performance share units. Beginning in 2017, stock-based compensation granted to employees includes restricted stock units in addition to performance share units. Prior to 2015, stock-based compensation also included stock options. As of December 31, 2017, there were 895 current and former employees participating in the stock option, performance share unit, and restricted stock unit programs.

NOTES (continued)
Georgia Power Company 2017 Annual Report

Performance Share Units
Performance share units granted to employees vest at the end of a three-year performance period. All unvested performance share units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of performance share units granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company issues performance share units with performance goals based on three performance goals to employees. These include performance share units with performance goals based on the total shareholder return (TSR) for Southern Company common stock during the three-year performance period as compared to a group of industry peers, performance share units with performance goals basedtheir respective PSC; therefore, no material impact on Southern Company's, cumulative earnings per share (EPS) overAlabama Power's, or Georgia Power's net income is expected.
On-site dry spent fuel storage facilities are operational at all three plants and can be expanded to accommodate spent fuel through the performance period, and performance share units with performance goals based on Southern Company's equity-weighted ROE over the performance period.expected life of each plant.
In 2015 and 2016, the EPS-based and ROE-based awards each represented 25% of the total target grant date fair value of the performance share unit awards granted. The remaining 50% of the total target grant date fair value consisted of TSR-based awards. Beginning in 2017, the total target grant date fair value of the stock compensation awards granted was comprised 20% each of EPS-based awards and ROE-based awards and 30% each of TSR-based awards and restricted stock units.
The fair value of TSR-based performance share unit awards is determined as of the grant date using a Monte Carlo simulation model to estimate the TSR of Southern Company's common stock among the industry peers over the performance period. The Company recognizes compensation expense on a straight-line basis over the three-year performance period without remeasurement.
The fair values of the EPS-based awards and the ROE-based awards are based on the closing stock price of Southern Company common stock on the date of the grant. Compensation expense for the EPS-based and ROE-based awards is generally recognized ratably over the three-year performance period initially assuming a 100% payout at the end of the performance period. Employees become immediately vested in the TSR-based performance share units, along with the EPS-based and ROE-based awards, upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. The expected payout related to the EPS-based and ROE-based awards is reevaluated annually with expense recognized to date increased or decreased based on the number of shares currently expected to be issued. Unlike the TSR-based awards, the compensation expense ultimately recognized for the EPS-based awards and the ROE-based awards will be based on the actual number of shares issued at the end of the performance period.
For the years ended December 31, 2017, 2016, and 2015, employees of the Company were granted performance share units of 138,102, 261,434, and 236,804, respectively. The weighted average grant-date fair value of TSR-based performance share units granted during 2017, 2016, and 2015, determined using a Monte Carlo simulation model to estimate the TSR of Southern Company's stock among the industry peers over the performance period, was $49.27, $45.17, and $46.41, respectively. The weighted average grant-date fair value of both EPS-based and ROE-based performance share units granted during 2017, 2016, and 2015 was $49.22, $48.84, and $47.78, respectively.
For the years ended December 31, 2017, 2016, and 2015, total compensation cost for performance share units recognized in income was $10 million, $15 million, and $15 million, respectively, with the related tax benefit also recognized in income of $4 million, $6 million, and $6 million, respectively. The compensation cost related to the grant of Southern Company performance share units to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. As of December 31, 2017, $3 million of total unrecognized compensation cost related to performance share award units will be recognized over a weighted-average period of approximately 21 months.
Restricted Stock Units
Beginning in 2017, stock-based compensation granted to employees included restricted stock units in addition to performance share units. One-third of the restricted stock units granted to employees vest each year throughout a three-year service period. All unvested restricted stock units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the vesting period.
The fair value of restricted stock units is based on the closing stock price of Southern Company common stock on the date of the grant. Since one-third of the restricted stock units vest each year throughout a three-year service period, compensation expense for restricted stock unit awards is generally recognized over the corresponding one-, two-, or three-year period. Employees

NOTES (continued)
Georgia Power Company 2017 Annual Report

become immediately vested in the restricted stock units upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility.
For the year ended December 31, 2017, employees of the Company were granted 59,218 restricted stock units. The weighted average grant-date fair value of restricted stock units granted during 2017 was $49.22.
For the year ended December 31, 2017, total compensation cost for restricted stock units recognized in income was $3 million with the related tax benefit also recognized in income of $1 million. As of December 31, 2017, $1 million of total unrecognized compensation cost related to restricted stock units will be recognized over a weighted-average period of approximately 13 months.
Stock Options
In 2015, Southern Company discontinued the granting of stock options. Stock options expire no later than 10 years after the grant date and the latest possible exercise will occur no later than November 2024.
The compensation cost related to the grant of Southern Company stock options to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. Compensation cost and related tax benefits recognized in the Company's financial statements were not material for any year presented. As of December 31, 2017, all compensation cost related to stock option awards has been recognized.
The total intrinsic value of options exercised during the years ended December 31, 2017, 2016, and 2015 was $13 million, $18 million, and $9 million, respectively. No cash proceeds are received by the Company upon the exercise of stock options. The actual tax benefit realized by the Company for the tax deductions from stock option exercises totaled $5 million, $7 million, and $4 million for the years ended December 31, 2017, 2016, and 2015, respectively. Prior to the adoption of ASU 2016-09 in 2016, the excess tax benefits related to the exercise of stock options were recognized in the Company's financial statements with a credit to equity. Upon the adoption of ASU 2016-09, beginning in 2016, all tax benefits related to the exercise of stock options are recognized in income. As of December 31, 2017, the aggregate intrinsic value for the options outstanding and exercisable was $30 million.
9. NUCLEAR INSURANCENuclear Insurance
Under the Price-Anderson Amendments Act (Act), the Company maintainsAlabama Power and Georgia Power maintain agreements of indemnity with the NRC that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at Plant Hatch and Plant Vogtle Units 1 and 2.the companies' nuclear power plants. The Act provides funds up to $13.4$16.2 billion for public liability claims that could arise from a single nuclear incident. Each nuclear plant is insured against this liability to a maximum of $450 million by American Nuclear Insurers (ANI), with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. The CompanyA company could be assessed up to $127$166 million per incident for each licensed reactor it operates but not more than an aggregate of $19$25 million per incident to be paid in a calendar year for each reactor. Such maximum assessment, excluding any applicable state premium taxes, for the Company,Alabama Power and Georgia Power, based on its ownership and buyback interests in all licensed reactors, is $247$332 million and $473 million, respectively, per incident, but not more than an aggregate of $37$49 million and $71 million, respectively, to be paid for each incident in any one year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years. The next scheduled adjustment is due no later than September 10, 2018.November 1, 2028. See Note 45 under "Joint Ownership Agreements" for additional information on joint ownership agreements.
The Company is a memberAlabama Power and Georgia Power are members of Nuclear Electric Insurance Limited (NEIL), a mutual insurer established to provide property damage insurance in an amount up to $1.5 billion for members' operating nuclear generating facilities. Additionally, the Company hasboth companies have NEIL policies that currently provide decontamination, excess property insurance, and premature decommissioning coverage up to $1.25 billion for nuclear losses and policies providing coverage up to $750 million for non-nuclear losses in excess of the $1.5 billion primary coverage.
NEIL also covers the additional costs that would be incurred in obtaining replacement power during a prolonged accidental outage at a member's nuclear plant. Members can purchase this coverage, subject to a deductible waiting period of up to 26 weeks, with a maximum per occurrence per unit limit of $490 million. After the deductible period, weekly indemnity payments would be received until either the unit is operational or until the limit is exhausted. The Company purchasesAlabama Power and Georgia Power each purchase limits based on the projected full cost of replacement power, subject to ownership limitations, and hashave each elected a 12-week deductible waiting period for each facility.nuclear plant.
A builders' risk property insurance policy has been purchased from NEIL for the construction of Plant Vogtle Units 3 andUnit 4. This policy provides the Vogtle Owners up to $2.75 billion for accidental property damage occurring during construction.
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Georgia Power Company 2017 Annual Report

Under each of the NEIL policies, members are subject to assessments each year if losses exceed the accumulated funds available to the insurer. The maximum annual assessments for the CompanyAlabama Power and Georgia Power as of December 31, 20172023 under the NEIL policies would be $81 million.$54 million and $89 million, respectively.
Claims resulting from terrorist acts and cyber events are covered under both the ANI and NEIL policies (subject to normal policy limits). The maximum aggregate however, that NEIL will pay for all claims resulting from terrorist acts and cyber events in any 12-month period is $3.2 billion each, plus such additional amounts NEIL can recover through reinsurance, indemnity, or other sources.
For all on-site property damage insurance policies for commercial nuclear power plants, the NRC requires that the proceeds of such policies shall be dedicated first for the sole purpose of placing the reactor in a safe and stable condition after an accident. Any remaining proceeds are to be applied next toward the costs of decontamination and debris removal operations ordered by the NRC, and any further remaining proceeds are to be paid either to the Companyapplicable company or to its debt trustees as may be appropriate under the policies and applicable trust indentures. In the event of a loss, the amount of insurance available might not be adequate to cover property damage and other expenses incurred. Uninsured losses and other expenses, to the extent not recovered from customers, would be borne by the CompanyAlabama Power or Georgia Power, as applicable, and could have a material effect on theSouthern Company's, Alabama Power's, and Georgia Power's financial condition and results of operations.
All retrospective assessments, whether generated for liability, property, or replacement power, may be subject to applicable state premium taxes.
10. FAIR VALUE MEASUREMENTSOther Matters
Fair value measurementsTraditional Electric Operating Companies
In April 2019, Bellsouth Telecommunications d/b/a AT&T Alabama (AT&T) filed a complaint against Alabama Power with the FCC alleging that the pole rental rate AT&T is required to pay pursuant to the parties' joint use agreement is unjust and unreasonable under federal law. The complaint sought a new rate and approximately $87 million in refunds of alleged overpayments for the preceding six years. In August 2019, the FCC stayed the case in favor of arbitration, which AT&T has not pursued. The joint use agreement remains in effect. The ultimate outcome of this matter cannot be determined at this time, but an adverse outcome could have a material impact on the financial statements of Southern Company and Alabama Power. Georgia Power and Mississippi Power have joint use agreements with other AT&T affiliates.
Mississippi Power
Kemper County Energy Facility
In 2021, 2022, and 2023, Mississippi Power recorded charges to income associated with abandonment and related closure costs and ongoing period costs, net of salvage proceeds, for the mine and gasifier-related assets at the Kemper County energy facility. These charges, including related tax impacts, totaled $11 million pre-tax ($8 million after tax) in 2021, $15 million pre-tax ($12 million after tax) in 2022, and $17 million pre-tax ($12 million after tax) in 2023. The pre-tax charges are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement.
Level 1 consists of observable market data in an active market for identical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.other operations and maintenance expenses on the statements of income.
Level 3 consists of unobservable market data. The input may reflect the assumptionsDismantlement of the abandoned gasifier-related assets and site restoration activities are expected to be completed by 2026. Additional pre-tax period costs associated with dismantlement and site restoration activities, including related costs for compliance and safety, ARO accretion, and property taxes, net of salvage, are estimated to total approximately $15 million annually through 2025.
Mississippi Power owns the lignite mine located around the Kemper County energy facility site. As a result of the abandonment of the Kemper IGCC, final mine reclamation began in 2018 and was substantially completed in 2020, with monitoring expected to continue through 2028.
As the mining permit holder, Liberty Fuels Company, LLC, a wholly-owned subsidiary of whatThe North American Coal Corporation, has a market participant would use in pricing an asset or liability. If there is little available market data, then the Company's own assumptions are the best availablelegal obligation to perform mine reclamation and Mississippi Power has a contractual obligation to fund all reclamation activities. See Note 6 for additional information.
See "General Litigation Matters –Southern Company and Mississippi Power" herein for information regarding litigation associated with the Kemper County energy facility.
Plant Daniel
In conjunction with Southern Company's 2019 sale of Gulf Power, NextEra Energy held back $75 million of the casepurchase price pending Mississippi Power and NextEra Energy negotiating a mutually acceptable revised operating agreement for Plant Daniel. In July 2022, the co-owners executed a revised operating agreement and Southern Company subsequently received the remaining $75 million of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the levelpurchase price. The dispatch procedures in the fair value hierarchy in whichrevised operating agreement for the fair value measurement is reported.two jointly-owned coal units
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Georgia Power Company 2017 Annual Report

As of December 31, 2017, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated levelPlant Daniel resulted in Mississippi Power designating one of the fair value hierarchy, weretwo units as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) Total
 (in millions)
Assets:       
Energy-related derivatives$
 $6
 $
 $6
Nuclear decommissioning trusts:(*)
       
Domestic equity248
 1
 
 249
Foreign equity
 166
 
 166
U.S. Treasury and government agency securities
 227
 
 227
Municipal bonds
 68
 
 68
Corporate bonds
 155
 
 155
Mortgage and asset backed securities
 40
 
 40
Other12
 12
 
 24
Cash equivalents690
 
 
 690
Total$950
 $675
 $
 $1,625
Liabilities:       
Energy-related derivatives$
 $19
 $
 $19
Interest rate derivatives
 5
 
 5
Total$
 $24
 $
 $24
(*)Includes the investment securities pledged to creditors and collateral received, and excludes receivables related to investment income, pending investment sales, currencies, and payables related to pending investment purchases and the securities lending program.primary and the other as secondary in lieu of each company separately owning 100% of a single generating unit. Mississippi Power did not exercise an option to purchase its co-owner's ownership interest for $1 on January 15, 2024. The revised operating agreement did not have a material impact on Mississippi Power's financial statements. See Note 1 under "Nuclear Decommissioning" for additional information.

NOTES (continued)
Georgia Power Company 2017 Annual Report

As of December 31, 2016, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) Total
 (in millions)
Assets:       
Energy-related derivatives$
 $44
 $
 $44
Interest rate derivatives
 2
 
 2
Nuclear decommissioning trusts:(*)
       
Domestic equity204
 1
 
 205
Foreign equity
 121


 121
U.S. Treasury and government agency securities
 71
 
 71
Municipal bonds
 73
 
 73
Corporate bonds
 164
 
 164
Mortgage and asset backed securities
 164
 
 164
Other11
 5
 
 16
Total$215
 $645
 $
 $860
Liabilities:       
Energy-related derivatives$
 $8
 $
 $8
Interest rate derivatives
 3
 
 3
Total$
 $11
 $
 $11
(*)Includes the investment securities pledged to creditors and collateral received, and excludes receivables related to investment income, pending investment sales, currencies, and payables related to pending investment purchases and the securities lending program. See Note 1 under "Nuclear Decommissioning" for additional information.
Valuation Methodologies
The energy-related derivatives primarily consist of over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The interest rate derivatives are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 11"Mississippi Power – Integrated Resource Plan" for additional information on how these derivatives are used.Plant Daniel.
The NRC requires licensees of commissioned nuclear power reactors to establish
Commitments
To supply a plan for providing reasonable assurance of funds for future decommissioning. For fair value measurements of the investments within the nuclear decommissioning trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available. See Note 1 under "Nuclear Decommissioning" for additional information.

NOTES (continued)
Georgia Power Company 2017 Annual Report

As of December 31, 2017 and 2016, other financial instruments for which the carrying amount did not equal fair value were as follows:
 
Carrying
Amount
 
Fair
Value
 (in millions)
Long-term debt, including securities due within one year:   
2017$11,777
 $12,531
2016$10,516
 $11,034
The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on current rates available to the Company.
11. DERIVATIVES
The Company is exposed to market risks, primarily commodity price risk and interest rate risk. To manage the volatility attributable to these exposures, the Company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 10 for additional information. In the statements of cash flows, the cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities.
Energy-Related Derivatives
The Company enters into energy-related derivatives to hedge exposures to electricity, gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the Company has limited exposure to market volatility in energy-related commodity prices. The Company manages a fuel-hedging program through the use of financial derivative contracts, which is expected to continue to mitigate price volatility. At December 31, 2017 and 2016, substantially all of the Company's energy-related derivative contracts were designated as regulatory hedges and were related to the Company's fuel-hedging program. Effective January 1, 2016, the Georgia PSC approved changes to the Company's hedging program allowing it to use an array of derivative instruments within a 48-month time horizon.
Energy-related derivative contracts are accounted for under one of two methods:
Regulatory Hedges – Energy-related derivative contracts which are designated as regulatory hedges relate primarily to the Company's fuel-hedging program, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through the fuel cost recovery mechanism.
Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred.
Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric industry. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.
At December 31, 2017, the net volume of energy-related derivative contracts for natural gas positions totaled 163 million mmBtu, all of which expire by 2021, which is the longest hedge date.
In addition to the volume discussed above, the Company enters into physical natural gas supply contracts that provide the option to sell back excess gas due to operational constraints. The expected volume of natural gas subject to such a feature is 10 million mmBtu for the Company.
Interest Rate Derivatives
The Company may also enter into interest rate derivatives to hedge exposure to changes in interest rates. The derivatives employed as hedging instruments are structured to minimize ineffectiveness. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or

NOTES (continued)
Georgia Powerthe Southern Company 2017 Annual Report

losses is recorded in OCI and is reclassifiedsystem's electric generating plants, the Southern Company system has entered into earnings at the same time the hedged transactions affect earnings, with any ineffectiveness recorded directly to earnings. At December 31, 2017, there were no cash flow hedges outstanding. Derivatives related to fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains and losses and the hedged items' fair value gains and losses attributable to interest rate risk are both recorded directly to earnings, providing an offset, with any differences representing ineffectiveness.
At December 31, 2017, the following interest rate derivatives were outstanding:
 Notional
Amount
 Interest
Rate
Received
 Weighted Average Interest
Rate Paid
 Hedge
Maturity
Date
 Fair Value
Gain (Loss)
December 31,
2017
 (in millions)       (in millions)
Fair Value Hedges of Existing Debt         
 $250
 5.40% 3-month LIBOR + 4.02% June 2018 $
 500
 1.95% 3-month LIBOR + 0.76% December 2018 (3)
 200
 4.25% 3-month LIBOR + 2.46% December 2019 (1)
Total$950
       $(4)
The estimated pre-tax gains (losses) related to interest rate derivatives that will be reclassified from accumulated OCI to interest expense for the 12-month period ending December 31, 2018 total $(4) million. Deferred gains and losses related to interest rate derivative settlements of cash flow hedges are expected to be amortized into earnings through 2037.
Derivative Financial Statement Presentation and Amounts
The Company enters into energy-related and interest rate derivative contracts that may contain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.

NOTES (continued)
Georgia Power Company 2017 Annual Report

At December 31, 2017 and 2016, the fair value of energy-related derivatives and interest rate derivatives was reflected in the balance sheets as follows:
 2017 2016
Derivative Category and Balance Sheet LocationAssetsLiabilities AssetsLiabilities
 (in millions)
Derivatives designated as hedging instruments for regulatory purposes     
Energy-related derivatives:     
Other current assets/Other current liabilities$2
$(9) $30
$1
Other deferred charges and assets/Other deferred credits and liabilities4
(10) 14
7
Total derivatives designated as hedging instruments for regulatory purposes$6
$(19) $44
$8
Derivatives designated as hedging instruments in cash flow and fair value hedges     
Interest rate derivatives:     
Other current assets/Other current liabilities$
$(4) $2
$
Other deferred charges and assets/Other deferred credits and liabilities
(1) 
3
Total derivatives designated as hedging instruments in cash flow and fair value hedges$
$(5) $2
$3
Gross amounts recognized$6
$(24) $46
$11
Gross amounts offset$(6)$6
 $(8)$(8)
Net amounts recognized in the Balance Sheets$
$(18) $38
$3
Energy-related derivativesvarious long-term commitments not designated as hedging instruments were immaterialrecognized on the balance sheets for 2017the procurement and 2016.delivery of fossil fuel and, for Alabama Power and Georgia Power, nuclear fuel. The majority of the Registrants' fuel expense for the periods presented was purchased under long-term commitments. Each Registrant expects that a substantial amount of its future fuel needs will continue to be purchased under long-term commitments.
At December 31, 2017Georgia Power has commitments, in the form of capacity purchases, regarding a portion of a 5% interest in the original cost of Plant Vogtle Units 1 and 2016,2 owned by MEAG Power that are in effect until the pre-tax effectslater of unrealized derivative gains (losses) arising from energy-related derivatives designated as regulatory hedging instrumentsthe retirement of the plant or the latest stated maturity date of MEAG Power's bonds issued to finance such ownership interest. The payments for capacity are required whether or not any capacity is available. Portions of the capacity payments made to MEAG Power for its Plant Vogtle Units 1 and deferred were as follows:
 Unrealized Losses Unrealized Gains
Derivative CategoryBalance Sheet Location2017 2016 Balance Sheet Location2017 2016
  (in millions)  (in millions)
Energy-related derivatives:Other regulatory assets, current$(7) $
 Other regulatory liabilities, current$
 $29
 Other regulatory assets, deferred(6) 
 Other deferred credits and liabilities
 7
Total energy-related derivative gains (losses) $(13) $
  $
 $36
For2 investment relate to costs in excess of Georgia Power's allowed investment for ratemaking purposes. The present value of these portions at the years ended December 31, 2017, 2016, and 2015,time of the pre-tax effectsdisallowance was written off. Generally, the cost of interest rate derivatives designated as cash flow hedging instruments on thesuch capacity is included in purchased power in Southern Company's statements of income and in purchased power, non-affiliates in Georgia Power's statements of income. Georgia Power's capacity payments related to this commitment totaled $3 million, $4 million, and $6 million in 2023, 2022, and 2021, respectively. At December 31, 2023, Georgia Power's estimated long-term obligations related to this commitment totaled $39 million, consisting of $4 million annually for 2024 and 2025, $2 million annually for 2026 through 2028, and $25 million thereafter.
See Note 9 for information regarding PPAs accounted for as leases.
Southern Company Gas has commitments for pipeline charges, storage capacity, and gas supply, including charges recoverable through natural gas cost recovery mechanisms or, alternatively, billed to marketers selling retail natural gas. Gas supply commitments include amounts for gas commodity purchases associated with Nicor Gas and SouthStar of 38 million mmBtu at floating gas prices calculated using forward natural gas prices at December 31, 2023 and valued at $98 million. Southern Company Gas provides guarantees to certain gas suppliers for certain of its subsidiaries in support of payment obligations. Southern Company Gas' expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets at December 31, 2023 were as follows:
Pipeline Charges, Storage Capacity, and Gas Supply
(in millions)
2024$587 
2025432 
2026231 
2027148 
2028103 
Thereafter785 
Total$2,286 
Guarantees
Derivatives in Cash Flow Hedging RelationshipsGain (Loss) Recognized in OCI on Derivative (Effective Portion) Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
        Amount
Derivative Category2017 2016 2015 Statements of Income Location2017 2016 2015
 (in millions)  (in millions)
Interest rate derivatives$1
 $
 $(15) Interest expense, net of amounts capitalized$(4) $(4) $(3)
SCS may enter into various types of wholesale energy and natural gas contracts acting as an agent for the traditional electric operating companies and Southern Power. Under these agreements, each of the traditional electric operating companies and Southern Power may be jointly and severally liable. Accordingly, Southern Company has entered into keep-well agreements with each of the traditional electric operating companies to ensure they will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of Southern Power as a contracting party under these agreements.
Alabama Power has guaranteed a $100 million principal amount long-term bank loan SEGCO entered into in 2018 and subsequently extended and amended. Georgia Power has agreed to reimburse Alabama Power for the portion of such obligation corresponding to Georgia Power's proportionate ownership of SEGCO's stock if Alabama Power is called upon to make such payment under its guarantee. At December 31, 2023, the capitalization of SEGCO consisted of $69 million of equity and $100
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million of long-term debt that matures in November 2024, on which the annual interest requirement is derived from a variable rate index. SEGCO had no short-term debt outstanding at December 31, 2023. See Note 7 under "SEGCO" for additional information.
As discussed in Note 9, Alabama Power and Georgia Power Company 2017 Annual Report
have entered into certain residual value guarantees related to railcar leases.

For the years ended December 31, 2017, 2016,4. REVENUE FROM CONTRACTS WITH CUSTOMERS
The Registrants generate revenues from a variety of sources, some of which are not accounted for as revenue from contracts with customers, such as leases, derivatives, and 2015, the pre-tax effects of interest rate derivatives designated as fair value hedging instrumentscertain cost recovery mechanisms. See Note 1 under "Revenues" for additional information on the statementsrevenue policies of income were immaterialthe Registrants. See Notes 9 and 14 for additional information on a gross basisrevenue accounted for under lease and derivative accounting guidance, respectively.
The following table disaggregates revenue from contracts with customers for the Company. Furthermore, the pre-tax effect of interest rate derivatives designated as fair value hedging instruments on the Company's statements of income were offset by changes to the carrying value of long-term debt. The gains and losses related to interest rate derivative settlements of fair value hedges are recorded directly to earnings.periods presented:
There was no ineffectiveness recorded in earnings for any period presented. The pre-tax effect of energy-related derivatives not designated as hedging instruments on the statements of income was immaterial for all years presented.
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Operating revenues
Retail electric revenues
Residential$7,309 $2,904 $4,105 $300 $ $ 
Commercial5,860 1,928 3,624 308   
Industrial3,613 1,721 1,558 334   
Other112 12 91 9   
Total retail electric revenues16,894 6,565 9,378 951   
Natural gas distribution revenues
Residential1,981     1,981 
Commercial505     505 
Transportation1,184     1,184 
Industrial45     45 
Other324     324 
Total natural gas distribution revenues4,039     4,039 
Wholesale electric revenues
PPA energy revenues1,107 234 87 20 790  
PPA capacity revenues624 156 51 45 376  
Non-PPA revenues250 65 35 407 409  
Total wholesale electric revenues1,981 455 173 472 1,575  
Other natural gas revenues
Gas marketing services528     528 
Other natural gas revenues31     31 
Total natural gas revenues559     559 
Other revenues1,355 213 578 39 55  
Total revenue from contracts with customers24,828 7,233 10,129 1,462 1,630 4,598 
Other revenue sources(a)
425 (183)(11)12 559 104 
Total operating revenues$25,253 $7,050 $10,118 $1,474 $2,189 $4,702 
Contingent Features
The Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain affiliated companies. At December 31, 2017, the Company had no collateral posted with derivative counterparties to satisfy these arrangements.
At December 31, 2017, the fair value of derivative liabilities with contingent features was $2 million. However, because of joint and several liability features underlying these derivatives, the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were $12 million, and include certain agreements that could require collateral in the event that one or more Southern Company system power pool participants has a credit rating change to below investment grade.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. If collateral is required, fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty.
The Company is exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Company has also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk. Therefore, the Company does not anticipate a material adverse effect on the financial statements as a result of counterparty nonperformance.
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Georgia Power Company 2017 Annual Report

12. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Summarized quarterly financial information for 2017 and 2016 is as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2022
Operating revenues
Retail electric revenues
Residential$6,604 $2,638 $3,664 $302 $— $— 
Commercial5,369 1,685 3,385 299 — — 
Industrial3,764 1,507 1,921 336 — — 
Other102 14 79 — — 
Total retail electric revenues15,839 5,844 9,049 946 — — 
Natural gas distribution revenues
Residential2,843 — — — — 2,843 
Commercial763 — — — — 763 
Transportation1,186 — — — — 1,186 
Industrial84 — — — — 84 
Other342 — — — — 342 
Total natural gas distribution revenues5,218 — — — — 5,218 
Wholesale electric revenues
PPA energy revenues2,274 489 130 16 1,673 — 
PPA capacity revenues596 194 47 356 — 
Non-PPA revenues250 200 30 690 740 — 
Total wholesale electric revenues3,120 883 207 710 2,769 — 
Other natural gas revenues
Gas marketing services636 — — — — 636 
Other natural gas revenues51 — — — — 51 
Total other natural gas revenues687 — — — — 687 
Other revenues1,077 194 446 47 36 — 
Total revenue from contracts with customers25,941 6,921 9,702 1,703 2,805 5,905 
Other revenue sources(a)
3,338 896 1,882 (9)564 57 
Total operating revenues$29,279 $7,817 $11,584 $1,694 $3,369 $5,962 
II-164
Quarter EndedOperating Revenues Operating Income Net Income After Dividends on Preferred and Preference Stock
 (in millions)
March 2017$1,832
 $501
 $260
June 20172,048
 639
 347
September 20172,546
 1,034
 580
December 20171,884
 470
 227

     
March 2016$1,872
 $509
 $269
June 20162,051
 656
 349
September 20162,698
 1,054
 599
December 20161,762
 258
 113
The Company's business is influenced by seasonal weather conditions.

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Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2021
Operating revenues
Retail electric revenues
Residential$6,207 $2,467 $3,471 $269 $— $— 
Commercial4,877 1,600 3,010 267 — — 
Industrial3,067 1,386 1,391 290 — — 
Other93 17 68 — — 
Total retail electric revenues14,244 5,470 7,940 834 — — 
Natural gas distribution revenues
Residential1,799 — — — — 1,799 
Commercial470 — — — — 470 
Transportation1,038 — — — — 1,038 
Industrial49 — — — — 49 
Other269 — — — — 269 
Total natural gas distribution revenues3,625 — — — — 3,625 
Wholesale electric revenues
PPA energy revenues1,122 184 95 11 854 — 
PPA capacity revenues493 115 55 323 — 
Non-PPA revenues236 170 21 401 398 — 
Total wholesale electric revenues1,851 469 171 417 1,575 — 
Other natural gas revenues
Wholesale gas services2,168 — — — — 2,168 
Gas marketing services464 — — — — 464 
Other natural gas revenues36 — — — — 36 
Total other natural gas revenues2,668 — — — — 2,668 
Other revenues1,075 202 452 31 30 — 
Total revenue from contracts with customers23,463 6,141 8,563 1,282 1,605 6,293 
Other revenue sources(a)
3,349 272 697 40 611 1,786 
Other adjustments(b)
(3,699)— — — — (3,699)
Total operating revenues$23,113 $6,413 $9,260 $1,322 $2,216 $4,380 
SELECTED FINANCIAL AND OPERATING DATA 2013-2017(a)Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues (including those related to fuel costs) that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies.
Georgia Power(b)Other adjustments relate to the cost of Southern Company 2017 Annual ReportGas' energy and risk management activities. Wholesale gas services revenues are presented net of the related costs of those activities on the statement of income. See Notes 15 and 16 under "Southern Company Gas" for information on the sale of Sequent and components of wholesale gas services' operating revenues, respectively.
 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions)$8,310
 $8,383
 $8,326
 $8,988
 $8,274
Net Income After Dividends
on Preferred and Preference Stock (in millions)
$1,414
 $1,330
 $1,260
 $1,225
 $1,174
Cash Dividends on Common Stock (in millions)$1,281
 $1,305
 $1,034
 $954
 $907
Return on Average Common Equity (percent)12.15
 12.05
 11.92
 12.24
 12.45
Total Assets (in millions)(a)(b)
$36,779
 $34,835
 $32,865
 $30,872
 $28,776
Gross Property Additions (in millions)$1,080
 $2,314
 $2,332
 $2,146
 $1,906
Capitalization (in millions):         
Common stock equity$11,931
 $11,356
 $10,719
 $10,421
 $9,591
Preferred and preference stock
 266
 266
 266
 266
Long-term debt(a)
11,073
 10,225
 9,616
 8,563
 8,571
Total (excluding amounts due within one year)$23,004
 $21,847
 $20,601
 $19,250
 $18,428
Capitalization Ratios (percent):         
Common stock equity51.9
 52.0
 52.0
 54.1
 52.0
Preferred and preference stock
 1.2
 1.3
 1.4
 1.4
Long-term debt(a)
48.1
 46.8
 46.7
 44.5
 46.6
Total (excluding amounts due within one year)100.0
 100.0
 100.0
 100.0
 100.0
Customers (year-end):         
Residential2,185,782
 2,155,945
 2,127,658
 2,102,673
 2,080,358
Commercial(c)
308,939
 305,488
 302,891
 300,186
 297,493
Industrial(c)
10,644
 10,537
 10,429
 10,192
 10,063
Other9,766
 9,585
 9,261
 9,003
 8,623
Total2,515,131
 2,481,555
 2,450,239
 2,422,054
 2,396,537
Employees (year-end)6,986
 7,527
 7,989
 7,909
 7,886
II-165
(a)A reclassification of debt issuance costs from Total Assets to Long-term debt of $124 million and $62 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(b)A reclassification of deferred tax assets from Total Assets of $34 million and $68 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(c)A reclassification of customers from commercial to industrial is reflected for years 2013-2015 to be consistent with the rate structure approved by the Georgia PSC. The impact to operating revenues, kilowatt-hour sales, and average revenue per kilowatt-hour by class is not material.


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Contract Balances
SELECTED FINANCIAL AND OPERATING DATA 2013-2017 (continued)The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at December 31, 2023 and 2022:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Accounts Receivable
At December 31, 2023$2,820 $821 $1,011 $90 $122 $684 
At December 31, 20223,123 696 922 92 237 1,107 
Contract Assets
At December 31, 2023$271 $$121 $— $— $56 
At December 31, 2022156 89 — — — 
Contract Liabilities
At December 31, 2023$116 $— $$— $$— 
At December 31, 202245 — — 
Contract assets for Georgia Power primarily relate to retail customer fixed bill programs, where the payment is contingent upon Georgia Power's continued performance and the customer's continued participation in the program over a one-year contract term, and unregulated service agreements, where payment is contingent on project completion. Contract liabilities for Georgia Power primarily relate to cash collections recognized in advance of revenue for unregulated service agreements. Southern Company 2017 Annual ReportGas' contract assets relate to work performed on an energy efficiency enhancement and upgrade contract with the U.S. General Services Administration. Southern Company Gas receives cash advances from a third-party financial institution to fund work performed, of which approximately $59 million had been received at December 31, 2023. These advances have been accounted for as long-term debt on the balance sheets. See Note 1 under "Affiliate Transactions" for additional information regarding the construction contract. At December 31, 2023 and 2022, Southern Company's unregulated distributed generation business had contract assets of $91 million and $65 million, respectively, and contract liabilities of $115 million and $32 million, respectively, for outstanding performance obligations.
Revenues recognized in 2023 and 2022, which were included in contract liabilities at December 31, 2023 and 2022, respectively, were $36 million annually for Southern Company and immaterial for the other Registrants. Contract liabilities are primarily classified as current on the balance sheets as the corresponding revenues are generally expected to be recognized within one year.
Remaining Performance Obligations
The Subsidiary Registrants may enter into long-term contracts with customers in which revenues are recognized as performance obligations are satisfied over the contract term. For the traditional electric operating companies and Southern Power, these contracts primarily relate to PPAs whereby electricity and generation capacity are provided to a customer. The revenue recognized for the delivery of electricity is variable; however, certain PPAs include a fixed payment for fixed generation capacity over the term of the contract. For Southern Company Gas, these contracts primarily relate to the U.S. General Services Administration contract described above. Southern Company's unregulated distributed generation business also has partially satisfied performance obligations related to certain fixed price contracts. Revenues from contracts with customers related to these performance obligations remaining at December 31, 2023 are expected to be recognized as follows:
20242025202620272028Thereafter
(in millions)
Southern Company$940 $552 $338 $332 $323 $2,045 
Alabama Power23 — — — — 
Georgia Power73 41 14 15 15 
Mississippi Power60 63 66 69 73 — 
Southern Power379 301 299 306 297 2,041 
Southern Company Gas26 — — — — — 
II-166
 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions):         
Residential$3,236
 $3,318
 $3,240
 $3,350
 $3,058
Commercial3,092
 3,077
 3,094
 3,271
 3,077
Industrial1,321
 1,291
 1,305
 1,525
 1,391
Other89
 86
 88
 94
 94
Total retail7,738
 7,772
 7,727
 8,240
 7,620
Wholesale — non-affiliates163
 175
 215
 335
 281
Wholesale — affiliates26
 42
 20
 42
 20
Total revenues from sales of electricity7,927
 7,989
 7,962
 8,617
 7,921
Other revenues383
 394
 364
 371
 353
Total$8,310
 $8,383
 $8,326
 $8,988
 $8,274
Kilowatt-Hour Sales (in millions):         
Residential26,144
 27,585
 26,649
 27,132
 25,479
Commercial32,155
 32,932
 32,719
 32,426
 31,984
Industrial23,518
 23,746
 23,805
 23,549
 23,087
Other584
 610
 632
 633
 630
Total retail82,401
 84,873
 83,805
 83,740
 81,180
Wholesale — non-affiliates3,277
 3,415
 3,501
 4,323
 3,029
Wholesale — affiliates800
 1,398
 552
 1,117
 496
Total86,478
 89,686
 87,858
 89,180
 84,705
Average Revenue Per Kilowatt-Hour (cents):         
Residential12.38
 12.03
 12.16
 12.35
 12.00
Commercial9.62
 9.34
 9.46
 10.09
 9.62
Industrial5.62
 5.44
 5.48
 6.48
 6.03
Total retail9.39
 9.16
 9.22
 9.84
 9.39
Wholesale4.64
 4.51
 5.80
 6.93
 8.54
Total sales9.17
 8.91
 9.06
 9.66
 9.35
Residential Average Annual
Kilowatt-Hour Use Per Customer
12,028
 12,864
 12,582
 12,969
 12,293
Residential Average Annual
Revenue Per Customer
$1,489
 $1,557
 $1,529
 $1,605
 $1,475
Plant Nameplate Capacity
Ratings (year-end) (megawatts)
15,274
 15,274
 15,455
 17,593
 17,586
Maximum Peak-Hour Demand (megawatts):         
Winter13,894
 14,527
 15,735
 16,308
 12,767
Summer16,002
 16,244
 16,104
 15,777
 15,228
Annual Load Factor (percent)61.1
 61.9
 61.9
 61.2
 63.5
Plant Availability (percent):         
Fossil-steam85.0
 87.4
 85.6
 86.3
 87.1
Nuclear93.5
 95.6
 94.1
 90.8
 91.8
Source of Energy Supply (percent):         
Oil and gas28.6
 28.2
 28.3
 26.3
 29.6
Coal22.4
 26.4
 24.5
 30.9
 26.4
Nuclear17.8
 17.6
 17.6
 16.7
 17.7
Hydro1.0
 1.1
 1.6
 1.3
 2.0
Other0.3
 
 
 
 
Purchased power —         
From non-affiliates7.8
 6.7
 5.0
 3.8
 3.3
From affiliates22.1
 20.0
 23.0
 21.0
 21.0
Total100.0
 100.0
 100.0
 100.0
 100.0


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5. PROPERTY, PLANT, AND EQUIPMENT
GULF POWER COMPANY
FINANCIAL SECTION


MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Gulf Power Company 2017 Annual Reportproperty; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and/or cost of equity funds used during construction.
The management of Gulf Power Company (the Company) is responsible for establishingRegistrants' property, plant, and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as definedequipment in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectivesservice consisted of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of the Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that the Company's internal control over financial reporting was effective as offollowing at December 31, 2017.2023 and 2022:

At December 31, 2023:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Electric utilities:
Generation$57,325 $16,584 $22,587 $2,909 $14,649 $ 
Transmission15,561 6,152 8,402 966   
Distribution26,482 9,775 15,380 1,327   
General/other6,305 2,918 3,001 321 41  
Electric utilities' plant in service105,673 35,429 49,370 5,523 14,690  
Southern Company Gas:
Natural gas transportation and distribution17,798     17,798 
Storage facilities1,565     1,565 
Other1,477     1,477 
Southern Company Gas plant in service20,840     20,840 
Other plant in service1,915      
Total plant in service$128,428 $35,429 $49,370 $5,523 $14,690 $20,840 
/s/ S. W. Connally, Jr.
S. W. Connally, Jr.
Chairman, President, and Chief Executive Officer

/s/ Robin B. Boren
Robin B. Boren
Vice President, Chief Financial Officer, and Treasurer
February 20, 2018


REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Gulf Power Company
Opinion on the Financial Statements
We have audited the accompanying balance sheets and statements of capitalization of Gulf Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, the related statements of income, comprehensive income, common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2017, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements (pages II-353 to II-391) present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018
We have served as the Company's auditor since 2002.

DEFINITIONS
TermMeaning
AFUDCAllowance for funds used during construction
Alabama PowerAlabama Power Company
AROAsset retirement obligation
ASCAccounting Standards Codification
ASUAccounting Standards Update
CCRCoal combustion residuals
Clean Air ActClean Air Act Amendments of 1990
CO2
Carbon dioxide
EPAU.S. Environmental Protection Agency
FASBFinancial Accounting Standards Board
FERCFederal Energy Regulatory Commission
GAAPU.S. generally accepted accounting principles
Georgia PowerGeorgia Power Company
IRSInternal Revenue Service
ITCInvestment tax credit
KWHKilowatt-hour
Mississippi PowerMississippi Power Company
mmBtuMillion British thermal units
Moody'sMoody's Investors Service, Inc.
MWMegawatt
NOX
Nitrogen oxide
OCIOther comprehensive income
power poolThe operating arrangement whereby the integrated generating resources of the traditional electric operating companies and Southern Power (excluding subsidiaries) are subject to joint commitment and dispatch in order to serve their combined load obligations
PPAPower purchase agreement
PSCPublic Service Commission
ROEReturn on equity
S&PS&P Global Ratings, a division of S&P Global Inc.
scrubberFlue gas desulfurization system
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECU.S. Securities and Exchange Commission
SO2
Sulfur dioxide
Southern CompanyThe Southern Company
Southern Company GasSouthern Company Gas and its subsidiaries
Southern Company systemSouthern Company, the traditional electric operating companies, Southern Power, Southern Company Gas (as of July 1, 2016), Southern Electric Generating Company, Southern Nuclear, SCS, Southern Linc, PowerSecure, Inc. (as of May 9, 2016), and other subsidiaries
Southern LincSouthern Communications Services, Inc.
Southern NuclearSouthern Nuclear Operating Company, Inc.
Southern PowerSouthern Power Company and its subsidiaries
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
traditional electric operating companiesAlabama Power, Georgia Power, Gulf Power Company, and Mississippi Power

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Gulf Power Company 2017 Annual Report
OVERVIEW
Business Activities
Gulf Power Company (the Company) operates as a vertically integrated utility providing electric service to retail customers within its traditional service territory located in northwest Florida and to wholesale customers in the Southeast.
Many factors affect the opportunities, challenges, and risks of the Company's business of providing electric service. These factors include the ability to maintain a constructive regulatory environment, to maintain and grow energy sales and customers, and to effectively manage and secure timely recovery of costs. These costs include those related to projected long-term demand growth, stringent environmental standards, reliability, restoration following major storms, fuel, and capital expenditures. The Company has various regulatory mechanisms that operate to address cost recovery. Effectively operating pursuant to these regulatory mechanisms and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the Company for the foreseeable future.
On April 4, 2017, the Florida PSC approved a settlement agreement (2017 Rate Case Settlement Agreement) among the Company and three intervenors with respect to the Company's request in 2016 to increase retail base rates. Among the terms of the 2017 Rate Case Settlement Agreement, the Company increased rates effective with the first billing cycle in July 2017 to provide an annual overall net customer impact of approximately $54.3 million. The net customer impact consisted of a $62.0 million increase in annual base revenues, less an annual purchased power capacity cost recovery clause credit for certain wholesale revenues of approximately $8 million through December 2019. In addition, the Company continued its authorized retail ROE midpoint (10.25%) and range (9.25% to 11.25%), is deemed to have a maximum equity ratio of 52.5% for all retail regulatory purposes, and implemented new dismantlement accruals effective July 1, 2017. The Company also began amortizing the regulatory asset associated with the investment balances remaining after the retirement of Plant Smith Units 1 and 2 (357 MWs) over 15 years effective January 1, 2018 and implemented new depreciation rates effective January 1, 2018. The 2017 Rate Case Settlement Agreement also resulted in a $32.5 million write-down of the Company's ownership of Plant Scherer Unit 3 (205 MWs), which was recorded in the first quarter 2017. The remaining issues related to the inclusion of the Company's investment in Plant Scherer Unit 3 in retail rates have been resolved as a result of the 2017 Rate Case Settlement Agreement, including recoverability of certain costs associated with the ongoing ownership and operation of the unit through the environmental cost recovery clause.
At December 31, 2022:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Electric utilities:
Generation$51,756 $15,920 $17,755 $2,826 $14,619 $— 
Transmission14,201 5,658 7,576 927 — — 
Distribution24,200 9,154 13,819 1,228 — — 
General/other5,806 2,740 2,729 273 39 — 
Electric utilities' plant in service95,963 33,472 41,879 5,254 14,658 — 
Southern Company Gas:
Natural gas transportation and distribution16,810 — — — — 16,810 
Storage facilities1,553 — — — — 1,553 
Other1,360 — — — — 1,360 
Southern Company Gas plant in service19,723 — — — — 19,723 
Other plant in service1,843 — — — — — 
Total plant in service$117,529 $33,472 $41,879 $5,254 $14,658 $19,723 
The 2017 Rate Case Settlement Agreement set forth a process for addressing the revenue requirement effectscost of the Tax Reform Legislation through a prospective changereplacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to the Company's base rates. Under the terms of the 2017 Rate Case Settlement Agreement, by March 1, 2018, the Company must identify the revenue requirements impacts and defer them to a regulatory asset or regulatory liability to be considered for prospective application in a change to base rates in a limited scope proceeding before the Florida PSC. In lieu of this approach, on February 14, 2018, the parties to the 2017 Rate Case Settlement Agreement filed a new stipulation and settlement agreement (2018 Tax Reform Settlement Agreement) with the Florida PSC. If approved, the 2018 Tax Reform Settlement Agreement will result in annual reductions of $18.2 million to the Company's base rates and $15.6 million to the Company's environmental cost recovery rates effective beginning the first calendar month following approval.
The 2018 Tax Reform Settlement Agreement also provides for a one-time refund of $69.4 million for the retail portion of unprotected (not subject to normalization) deferred tax liabilities through the Company's fuel cost recovery rate over the remainder of 2018. In addition, a limited scope proceeding to address the flow back of protected deferred tax liabilities will be initiated by May 1, 2018 and the Company will record a regulatory liability for the related 2018 amounts eligible to be returned to customers consistent with IRS normalization principles. Unless otherwise agreed to by the parties to the 2018 Tax Reform Settlement Agreement, amounts recorded in this regulatory liability will be refunded to retail customers in 2019 through the Company's fuel cost recovery rate.
If the 2018 Tax Reform Settlement Agreement is approved, the 2017 Rate Case Settlement Agreement will be amended to increase the Company's maximum equity ratio from 52.5% to 53.5% for regulatory purposes.
The ultimate outcome of these matters cannot be determined at this time.
On October 25, 2017, the Florida PSC approved the Company's 2018 annual cost recovery clause factors to provide for a net annual revenue increase of $63 million. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Cost Recovery Clauses" herein for additional information.
The Company continues to focus on several key performance indicators including, but not limited to, customer satisfaction, plant availability, system reliability, and net income after dividends on preference stock. The Company's financial success is directly

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. Management uses customer satisfaction surveys to evaluate the Company's results and generally targets the top quartile of these surveys in measuring performance.
See RESULTS OF OPERATIONS herein for information on the Company's financial performance.
Earnings
The Company's 2017 net income after dividends on preference stock was $135 million, representing a $4 million, or 3.1%, increase over the previous year. The increase was primarily due to higher retail base revenues and lower depreciation, partially offset by a write-down of $32.5 million ($20 million after tax) of the Company's ownership of Plant Scherer Unit 3 resulting from the 2017 Rate Case Settlement Agreement and by higherother operations and maintenance expenses as compared toincurred or performed with the corresponding period in 2016.exception of nuclear refueling costs and certain maintenance costs including those described below.
In 2016, the net income after dividends on preference stock was $131 million, representing a $17 million, or 11.5%, decrease over the previous year. The decrease was primarily due to lower wholesale revenuesaccordance with orders from their respective state PSCs, Alabama Power and higher depreciation, partially offset by higher retail revenues and lowerGeorgia Power defer nuclear refueling outage operations and maintenance expenses as compared to a regulatory asset when the correspondingcharges are incurred. Alabama Power amortizes the costs over a subsequent 18-month period with Plant Farley's fall outage cost amortization beginning in 2015.
RESULTS OF OPERATIONS
A condensed statementJanuary of income follows:the following year and spring outage cost amortization beginning in July of the same year. Georgia Power amortizes its costs over each unit's
II-167
 Amount 
Increase (Decrease)
from Prior Year
 2017 2017 2016
 (in millions)
Operating revenues$1,516
 $31
 $2
Fuel427
 (5) (13)
Purchased power155
 13
 7
Other operations and maintenance359
 23
 (18)
Depreciation and amortization137
 (35) 31
Taxes other than income taxes116
 (4) 2
Loss on Plant Scherer Unit 333
 33
 
Total operating expenses1,227
 25
 9
Operating income289
 6
 (7)
Total other income and (expense)(60) (8) (11)
Income taxes90
 (1) (1)
Net income139
 (1) (17)
Dividends on preference stock4
 (5) 
Net income after dividends on preference stock$135
 $4
 $(17)

Table of ContentsIndex to Financial Statements


MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)COMBINED NOTES TO FINANCIAL STATEMENTS
Gulf Power Company 2017 Annual Report

operating cycle, or 18 months for Plant Vogtle Units 1, 2, and 3 and 24 months for Plant Hatch Units 1 and 2. Georgia Power's amortization period begins the month the refueling outage starts.
Operating RevenuesA portion of Mississippi Power's railway track maintenance costs is charged to fuel stock and recovered through Mississippi Power's fuel clause.
Operating revenuesThe portion of Southern Company Gas' non-working gas used to maintain the structural integrity of natural gas storage facilities that is considered to be non-recoverable is depreciated, while the recoverable or retained portion is not depreciated.
See Note 9 for 2017 were $1.52 billion, reflecting an increaseinformation on finance lease right-of-use (ROU) assets, net, which are included in property, plant, and equipment.
The Registrants have deferred certain implementation costs related to cloud hosting arrangements. At December 31, 2023 and 2022, deferred cloud implementation costs, net of $31 million from 2016. Details of operating revenues wereamortization, which are generally included in other deferred charges and assets on the Registrants' balance sheets, are as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred cloud implementation costs, net:
At December 31, 2023$325 $85 $99 $13 $15 $43 
At December 31, 2022345 81 108 14 18 54 
 Amount
 2017 2016
 (in millions)
Retail — prior year$1,281
 $1,249
Estimated change resulting from –   
Rates and pricing40
 30
Sales growth2
 
Weather(11) 1
Fuel and other cost recovery(31) 1
Retail — current year1,281
 1,281
Wholesale revenues –   
Non-affiliates57
 61
Affiliates108
 75
Total wholesale revenues165
 136
Other operating revenues70
 68
Total operating revenues$1,516
 $1,485
Percent change2.1% N/M
N/M - Not meaningful
In 2017, retail revenues remained flat when compared to 2016 primarily due to an increase in retail base revenues effectiveOnce a hosted software is placed into service, the related deferred costs are amortized on a straight-line basis over the remaining expected hosting arrangement term, including any renewal options that are reasonably certain of exercise. The amortization is reflected with the first billing cycle in July 2017, offset by decreases in fuel and purchased power capacity clause revenues and the impact of milder weather. In 2016, retail revenues increased $32 million, or 2.6%, when compared to 2015 primarily as a result of an increase in the Company's environmental cost recovery clause revenues, partially offset by a decrease in the energy conservation clause revenues. See "Energy Sales" below for a discussion of changes in the volume of energy sold, including changes related to sales growth and weather.
In 2017, revenues associated with changes in rates and pricing increased primarily due to an increase in retail base rates effective with the first billing cycle in July 2017. In 2016, revenues associated with changes in rates and pricing increased primarily due to an increase in the environmental cost recovery clause as a result of additional rate base investment related to environmental compliance equipment placed in service at the end of 2015 as well as portions of the Company's ownership in Plant Scherer Unit 3 that were rededicated to retail service in 2016. Annually, the Company petitions the Florida PSC for recovery of projected environmental and energy conservation costs, including any true-up amount from prior periods, and approved rates are implemented each January. The recovery provisions include related expenses and a return on average net investment.
Fuel and other cost recovery provisions include fuel expenses, the energy component of purchased power costs, purchased power capacity costs, the difference between projected and actual costs and revenues related to energy conservation and environmental compliance, and a credit for certain wholesale revenues as a result of the 2017 Rate Case Settlement Agreement. Annually, the Company petitions the Florida PSC for recovery of projected fuel and purchased power costs, including any true-up amount from prior periods, and approved rates are implemented each January. The recovery provisions generally equal the related expenses and have no material effect on earnings.
See Note 1 to the financial statements under "Revenues" and Note 3 to the financial statements under "Retail Regulatory Matters" for additional information regarding the Company's retail base rate cases, cost recovery clauses, and related rate changes.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Wholesale revenues from power sales to non-affiliated utilities were as follows:
 2017 2016 2015
 (in millions)
Capacity and other$25
 $30
 $67
Energy32
 31
 40
Total non-affiliated$57
 $61
 $107
Wholesale revenues from sales to non-affiliates consist of long-term sales agreements to other utilities in Florida and Georgia and short-term opportunity sales. Capacity revenues from long-term sales agreements represent the greatest contribution to net income. The energy is generally sold at variable cost. Short-term opportunity sales are made at market-based rates that generally provide a margin above the Company's variable cost of energy. Wholesale energy revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of the Company's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation.
In 2017, wholesale revenues from sales to non-affiliates decreased $4 million, or 6.6%, as compared to the prior year primarily due to a 16.0% decrease in capacity revenues resulting from the expiration of a Plant Scherer Unit 3 long-term sales agreement in 2016. In 2016, wholesale revenues from sales to non-affiliates decreased $46 million, or 43.0%, as compared to the prior year primarily due to a 55.3% decrease in capacity revenues resulting from the expiration of Plant Scherer Unit 3 long-term sales agreements in December 2015 and May 2016.
Wholesale revenues from sales to affiliated companies will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the Intercompany Interchange Contract (IIC), as approved by the FERC. These transactions do not have a significant impact on earnings since the revenue related to these energy sales generally offsets the cost of energy sold. In 2017, wholesale revenues from sales to affiliates increased $33 million, or 44.0%, as compared to the prior year primarily due to a 39.6% increase in KWH sales to affiliates due to the dispatch of the Company's lower cost generation resources to serve system territorial load. In 2016, wholesale revenues from sales to affiliates increased $17 million, or 29.3%, as compared to the prior year primarily due to a 46.1% increase in KWH sales to affiliates due to lower planned unit outages for the Company's generation resources and a 7.9% increase in the price of energy sold to affiliates due to more sales during peak load hours.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2017 and the percent change from the prior year were as follows:
 
Total
KWHs
 
Total KWH
Percent Change
 
Weather-Adjusted
Percent Change
 2017 2017 2016 2017 2016
 (in millions)
        
Residential5,229
 (2.4)% (0.1)% 1.3 % (0.2)%
Commercial3,814
 (1.4) (0.7) 
 (1.5)
Industrial1,740
 (5.0) 1.8
 (5.0) 1.8
Other26
 4.5
 (0.8) 4.5
 (0.8)
Total retail10,809
 (2.5) 
 (0.2)% (0.3)%
Wholesale         
Non-affiliates749
 (0.1) (27.8)    
Affiliates3,887
 39.6
 46.1
    
Total wholesale4,636
 31.2
 20.0
    
Total energy sales15,445
 5.7 % 4.2 %    
Changes in retail energy salescloud hosting fees, which are generally the result of changesreflected in electricity usage by customers, changes in weather, and changes in the number of customers. Retail energy sales decreased 2.5% in 2017 compared to the prior year primarily due to milder weather in the first half of the year, partially offset by customer growth. Weather-adjusted residential KWH sales increased

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

primarily due to customer growth. Weather-adjusted commercial KWH sales remained flat as a result of lower customer usage primarily resulting from efficiency improvements in appliances and lighting, offset by customer growth. Industrial KWH sales decreased in 2017 compared to 2016 primarily due to changes in customers' operations and energy efficiency improvements.
Residential and commercial KWH sales decreased in 2016 compared to 2015 due to declining use per customer primarily resulting from energy efficiency improvements, partially offset by customer growth and warmer weather during the third quarter. Industrial KWH sales increased in 2016 compared to 2015 primarily due to decreased customer co-generation, partially offset by changes in customers' operations.
See "Operating Revenues" above for a discussion of significant changes in wholesale sales to non-affiliates and affiliated companies.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for the Company. The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel, and the availability of generating units. Additionally, the Company purchases a portion of its electricity needs from the wholesale market.
Details of the Company's generation and purchased power were as follows:
 2017 2016 2015
Total generation (in millions of KWHs)
9,310
 8,259
 8,629
Total purchased power (in millions of KWHs)
5,991
 6,973
 5,976
Sources of generation (percent) –
     
Coal54
 57
 57
Gas46
 43
 43
Cost of fuel, generated (in cents per net KWH) –
     
Coal3.14
 3.68
 3.88
Gas3.55
 4.17
 4.22
Average cost of fuel, generated (in cents per net KWH)
3.32
 3.89
 4.03
Average cost of purchased power (in cents per net KWH)(*)
4.55
 3.63
 3.89
(*)Average cost of purchased power includes fuel purchased by the Company for tolling agreements where power is generated by the provider.
In 2017, total fuel and purchased power expenses were $582 million, an increase of $8 million, or 1.4%, from the prior year costs. The increase was primarily the result of a $6 million net increase due to a higher volume of KWHs generated and purchased and a $2 million net increase due to a higher average cost of fuel and purchased power.
In 2016, total fuel and purchased power expenses were $574 million, a decrease of $6 million, or 1.0%, from the prior year costs. The decrease was primarily the result of a $30 million decrease due to a lower average cost of fuel and purchased power, largely offset by a $24 million increase due to a higher volume of KWHs generated and purchased.
Fuel and purchased power transactions do not have a significant impact on earnings since energy and capacity expenses are generally offset by energy and capacity revenues through the Company's fuel and purchased power capacity cost recovery clauses and long-term wholesale contracts. See Note 3 to the financial statements under "Retail Regulatory Matters – Cost Recovery Clauses – Retail Fuel Cost Recovery" and " – Purchased Power Capacity Recovery" for additional information.
Fuel
Fuel expense was $427 million in 2017, a decrease of $5 million, or 1.2%, from the prior year costs. The decrease was primarily due to a 14.7% decrease in the average cost of fuel per KWH generated due to lower coal and natural gas prices, partially offset by a 12.7% higher volume of KWHs generated due to the dispatch of the Company's lower cost generation resources to serve system territorial load. In 2016, fuel expense was $432 million, a decrease of $13 million, or 2.9%, from the prior year costs. The decrease was primarily due to a 3.5% decrease in the average cost of fuel per KWH generated due to lower coal and natural gas prices and a 4.3% lower volume of KWHs generated due to an increase in KWHs purchased from lower-cost gas-fired PPA resources.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Purchased Power
Purchased power expense was $155 million in 2017, an increase of $13 million, or 9.2%, from the prior year. The increase was primarily due to a 25.3% increase in the average cost per KWH purchased, partially offset by a 14.1% decrease in the volume of KWHs purchased. In 2016, purchased power expense was $142 million, an increase of $7 million, or 5.2%, from the prior year. The increase was primarily due to a 16.7% increase in the volume of KWHs purchased, partially offset by a 6.7% decrease in the average cost per KWH purchased resulting from lower energy costs from gas-fired resources.
Energy purchases from non-affiliates and affiliates will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Affiliate purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
In 2017, other operations and maintenance expenses increased $23on the Registrants' statements of income. In 2023, amortization of deferred cloud implementation costs recognized was $46 million or 6.8%, compared tofor Southern Company, $11 million for Alabama Power, $19 million for Georgia Power, $8 million for Southern Company Gas, and immaterial for the prior year primarily due to increasesother Registrants. In 2022, amortization of $7deferred cloud implementation costs recognized was $29 million in environmental compliance expenses, $6for Southern Company, $8 million in rate case expensefor Alabama Power, $12 million for Georgia Power, and immaterial for the other Registrants. In 2021, amortization related to the 2017 Rate Case Settlement Agreement, $6 million in routinefrom deferred cloud implementation costs recognized was immaterial for all Registrants.
See Note 2 under "Regulatory Assets and planned maintenance at generation facilities,Liabilities" and $3 million in energy services expenses. In 2016,"Alabama Power – Software Accounting Order" for information on deferrals of certain other operations and maintenance expenses decreased $18 million, or 5.1%, compared to the prior year primarily due to decreases of $7 million in marketing incentive programs and $6 million in routine and planned maintenance expenses at generation facilities. Also contributing to the decrease was $4 million in rate case expense amortization recorded in 2015 and a $3 million reduction in employee compensation and benefits expenses including pension costs.
Expenses from energy services and marketing incentive programs did not have a significant impact on earnings since they were generally offset by associated revenues. Rate case expenses were amortized as authorized in the 2017 Rate Case Settlement Agreement and a settlement agreement approved by the Florida PSC in 2013 (2013 Rate Case Settlement Agreement). See Note 3 to the financial statements under "Retail Regulatory Matters – Base Rate Cases" and " – Cost Recovery Clauses" and Note 2 to the financial statements for additional information related to rate case expenses and environmental compliance costs and pension costs, respectively.
Depreciation and Amortization
Depreciation and amortization decreased $35 million, or 20.3%, in 2017 compared to the prior year. The decrease was primarily due to the reduction in depreciation of $34.0 million recorded in 2017, as authorized in the 2013 Rate Case Settlement Agreement. In 2016, depreciation and amortization increased $31 million, or 22.0%, compared to the prior year. The increase was primarily due to a reduction in depreciation of $20.1 million recorded in 2015, as authorized in the 2013 Rate Case Settlement Agreement, and an increase of $9 million primarily attributable to property additions to utility plant. See Note 3 to the financial statements under "Retail Regulatory Matters – Retail Base Rate Cases" for additional information.
Total Other Income and (Expense)
In 2017, total other income and (expense) decreased $8 million, or 15.4%, compared to the prior year primarily due to a $5 million increase in donations and a $3 million increase in interest expense, net of amounts capitalized. The increase in interest expense was primarily due to deferred returns on transmission projects in 2016, which reduced interest expense and were recorded as a regulatory asset, as authorized in the 2013 Rate Case Settlement Agreement. In 2016, total other income and (expense) decreased $11 million, or 26.8%, primarily due to a decrease of $13 million in AFUDC equity related to environmental control projects at generating facilities and transmission projects placed in service in 2015, partially offset by a $2 million decrease in interest expense, net of amounts capitalized, primarily due to the redemption of debt. See Note 1 to the financial statements under "Allowance for Funds Used During Construction" for additional information.
Dividends on Preference Stock
Dividends on preference stock decreased $5 million, or 55.6%, in 2017 compared to the prior year due to the redemption of all preference stock in June 2017. See FINANCIAL CONDITION AND LIQUIDITY – "Financing Activities" herein for additional information.
Effects of Inflation
The Company is subject to rate regulation that is generally based on the recovery of historical and projected costs. The effects of inflation can create an economic loss since the recovery of costs could be in dollars that have less purchasing power. Any adverse effect of inflation on the Company's results of operations has not been substantial in recent years.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

FUTURE EARNINGS POTENTIAL
General
The Company operates as a vertically integrated utility providing electric service to retail customers within its traditional service territory located in northwest Florida and to wholesale customers in the Southeast. Prices for electricity provided by the Company to retail customers are set by the Florida PSC under cost-based regulatory principles. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. Retail rates and earnings are reviewed and may be adjusted periodically within certain limitations. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein and Note 3 to the financial statements under "Retail Regulatory Matters" for additional information about regulatory matters.
The results of operations for the past three years are not necessarily indicative of future earnings potential. The level of the Company's future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Company's business of providing electric service. These factors include the Company's ability to maintain a constructive regulatory environment that continues to allow for the timely recovery of prudently-incurred costs during a time of increasing costs and limited projected demand growth over the next several years. Future earnings will be driven primarily by customer growth. Earnings will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies due to changes in the minimum allowable equipment efficiencies along with the continuation of changes in customer behavior, both of which could contribute to a net reduction in customer usage. Earnings are subject to a variety of other factors. These factors include weather, competition, energy conservation practiced by customers, the use of alternative energy sources by customers, the price of electricity, the price elasticity of demand, and the rate of economic growth or decline in the Company's service territory. Demand for electricity is primarily driven by the pace of economic growth that may be affected by changes in regional and global economic conditions, which may impact future earnings.
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018, which among other things, reduces the federal corporate income tax rate to 21% and changes rates of depreciation and the business interest deduction. See "Income Tax MattersFederal Tax Reform Legislation" and FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Notes 3 and 5 to the financial statements for additional information.
Environmental Matters
The Company's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, and protection of other natural resources. The Company maintains a comprehensive environmental compliance strategy to assess upcoming requirements and compliance costs associated with these environmental lawssoftware and regulations. The costs, including capital expenditures and operations and maintenance costs, required to comply with environmental laws and regulations may impact future unit retirement and replacement decisions, results of operations, cash flows, and financial condition. Compliance costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, and adding or changing fuel sources for certain existing units, as well as related upgrades to the transmission system. A major portion of these compliance costs are expected to be recovered through existing ratemaking provisions. The ultimate impact of the environmental laws and regulations discussed below will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, and the outcome of pending and/or future legal challenges.
New or revised environmental laws and regulations could affect many areas of the Company's operations. The impact of any such changes cannot be determined at this time. Environmental compliance costs could affect earnings if such costs cannot continue to be fully recovered in rates on a timely basis or through long-term wholesale agreements. The State of Florida has statutory provisions that allow a utility to petition the Florida PSC for recovery of prudent environmental compliance costs that are not being recovered through base rates or any other recovery mechanism. The Company's current long-term wholesale agreements contain provisions that permit charging the customer with costs incurred as a result of changes in environmental laws and regulations. Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity, which could negatively affect results of operations, cash flows, and financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affect their demand for electricity. See "Other Matters" herein and Note 3 to the financial statements under "Retail Regulatory Matters – Cost Recovery Clauses – Environmental Cost Recovery" for additional information, including a discussion on the State of Florida's statutory provisions on environmental cost recovery.
Through 2017, the Company has invested approximately $2.0 billion in environmental capital retrofitcloud computing projects to comply with environmental requirements, with annual totals of approximately $30 million, $28 million, and $116 million for 2017, 2016, and 2015, respectively. Although the timing, requirements, and estimated costs could change as environmental laws and regulations

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, the Company's current compliance strategy estimates capital expenditures of $279 million from 2018 through 2022, with annual totals of approximately $65 million, $57 million, $83 million, $58 million, and $16 million for 2018, 2019, 2020, 2021, and 2022, respectively. These estimates do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See "Global Climate Issues" herein for additional information. The Company also anticipates expenditures associated with ash pond closure and ground water monitoring under the Disposal of Coal Combustion Residuals from Electric Utilities rule (CCR Rule), which are reflected in the Company's ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
Environmental Laws and Regulations
Air Quality
The EPA has set National Ambient Air Quality Standards (NAAQS) for six air pollutants (carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and SO2), which it reviews and revises periodically. Revisions to these standards can require additional emission controls, improvements in control efficiency, or fuel changes which can result in increased compliance and operational costs. NAAQS requirements can also adversely affect the siting of new facilities. In 2015, the EPA published a more stringent eight-hour ozone NAAQS. The EPA plans to complete designations for this rule by no later than April 30, 2018. No areas within the Company's service territory have been or are anticipated to be designated nonattainment under the 2015 ozone NAAQS. In 2010, the EPA revised the NAAQS for SO2, establishing a new one-hour standard, and is completing designations in multiple phases. The EPA has issued several rounds of area designations and no areas in the vicinity of Company-owned SO2 sources have been designated nonattainment under the 2010 one-hour SO2 NAAQS. However, final eight-hour ozone and SO2 one-hour designations for certain areas are still pending and, if other areas are designated as nonattainment in the future, increased compliance costs could result.
In 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) and its NOX annual, NOX seasonal, and SO2 annual programs. CSAPR is an emissions trading program that addresses the impacts of the interstate transport of SO2 and NOX emissions from fossil fuel-fired power plants located in upwind states in the eastern half of the U.S. on air quality in downwind states. The Company has fossil fuel-fired generation subject to these requirements. In October 2016, the EPA published a final rule that revised the CSAPR seasonal NOX program, which completely removed Florida from all CSAPR programs, left the Georgia seasonal NOX budget unchanged, and established more stringent NOX emissions budgets in Mississippi. The outcome of ongoing CSAPR litigation could have an impact on the State of Mississippi's allowance allocations under the CSAPR seasonal NOX program. Increases in either future fossil fuel-fired generation or the cost of CSAPR allowances could have a negative financial impact on results of operations for the Company.
The EPA finalized regional haze regulations in 2005 and 2017. These regulations require states, tribal governments, and various federal agencies to develop and implement plans to reduce pollutants that impair visibility and demonstrate reasonable progress toward the goal of restoring natural visibility conditions in certain areas, including national parks and wilderness areas. States must submit a revised state implementation plan (SIP) to the EPA by July 31, 2021, demonstrating reasonable progress towards achieving visibility improvement goals. State implementation of reasonable progress could require further reductions in SO2 or NOX emissions, which could result in increased compliance costs.
In 2015, the EPA published a final rule requiring certain states (including Florida, Georgia, and Mississippi) to revise or remove the provisions of their SIPs regulating excess emissions at industrial facilities, including electric generating facilities, during periods of startup, shut-down, or malfunction (SSM). The state excess emission rules provide necessary operational flexibility to affected units during periods of SSM and, if removed, could affect unit availability and result in increased operations and maintenance costs for the Company. The EPA has not yet responded to the SIP revisions proposed by states where the Company's generating units are located.
Water Quality
In 2014, the EPA finalized requirements under Section 316(b) of the Clean Water Act (CWA) to regulate cooling water intake structures at existing power plants and manufacturing facilities in order to minimize their effects on fish and other aquatic life. The regulation requires plant-specific studies to determine applicable measures to protect organisms that either get caught on the intake screens (impingement) or are drawn into the cooling system (entrainment). The ultimate impact of this rule will depend on the outcome of these plant-specific studies and any additional protective measures required to be incorporated into each plant's National Pollutant Discharge Elimination System (NPDES) permit based on site-specific factors.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

In 2015, the EPA finalized the steam electric effluent limitations guidelines (ELG) rule that set national standards for wastewater discharges from steam electric generating units. The rule prohibits effluent discharges of certain wastestreams and imposes stringent arsenic, mercury, selenium, and nitrate/nitrite limits on scrubber wastewater discharges. The revised technology-based limits and compliance dates may require extensive modifications to existing ash and wastewater management systems or the installation and operation of new ash and wastewater management systems. Compliance with the ELG rule is expected to require capital expenditures and increased operational costs primarily affecting the Company's coal-fired electric generation. Compliance applicability dates range from November 1, 2018 to December 31, 2023 with state environmental agencies incorporating specific applicability dates in the NPDES permitting process based on information provided for each waste stream. The EPA has committed to a new rulemaking that could potentially revise the limitations and applicability dates of the ELG rule. The EPA expects to finalize this rulemaking in 2020.
In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) jointly published a final rule that revised the regulatory definition of waters of the United States (WOTUS) for all CWA programs. The rule significantly expanded the scope of federal jurisdiction over waterbodies (such as rivers, streams, and canals), which could impact new generation projects and permitting and reporting requirements associated with the installation, expansion, and maintenance of transmission and distribution projects. On July 27, 2017, the EPA and the Corps proposed to rescind the 2015 WOTUS rule. The WOTUS rule has been stayed by the U.S. Court of Appeals for the Sixth Circuit since late 2015, but on January 22, 2018, the U.S. Supreme Court determined that federal district courts have jurisdiction over the pending challenges to the rule. On February 6, 2018, the EPA and the Corps published a final rule delaying implementation of the 2015 WOTUS rule to 2020.
In addition, numeric nutrient water quality standards promulgated by the State of Florida to limit the amount of nitrogen and phosphorous allowed in state waters are in effect for the State's streams and estuaries. The impact of these standards will depend on further regulatory action in connection with their site-specific implementation through the State of Florida's NPDES permitting program and Total Maximum Daily Load restoration program and cannot be determined at this time.
Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (CCR units) at active generating power plants. The CCR Rule requires CCR units to be evaluated against a set of performance criteria and potentially closed if minimum criteria are not met. Closure of existing CCR units could require installation of equipment and infrastructure to manage CCR in accordance with the rule. The EPA has announced plans to reconsider certain portions of the CCR Rule by no later than December 2019, which could result in changes to deadlines and corrective action requirements.
The EPA's reconsideration of the CCR Rule is due in part to a legislative development that impacts the potential oversight role of state agencies. Under the Water Infrastructure Improvements for the Nation Act, which became law in 2016, states are allowed to establish permit programs for implementing the CCR Rule.
Based on cost estimates for closure and monitoring of ash ponds pursuant to the CCR Rule, and the closure of an ash pond at Plant Scholz, the Company recorded AROs for each CCR unit in 2015. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary. The estimated costs associated with closure of the ash ponds at Plant Scholz and Plant Smith for 2018 have been approved for recovery through the environmental cost recovery clause. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information regarding the Company's AROs as of December 31, 2017.
Environmental Remediation
The Company must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Company could incur substantial costs to clean up affected sites. The Company conducts studies to determine the extent of any required cleanup and has recognized the estimated costs to clean up known affected sites in its financial statements. Included in this amount are costs associated with remediation of the Company's substation sites. These projects have been approved by the Florida PSC for recovery through the environmental cost recovery clause; therefore, these liabilities have no impact to the Company's net income. The Company may be liable for some or all required cleanup costs for additional sites that may require environmental remediation. See Note 3 to the financial statements under "Environmental Matters – Environmental Remediation" for additional information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Global Climate Issues
In 2015, the EPA published final rules limiting CO2 emissions from new, modified, and reconstructed fossil fuel-fired electric generating units and guidelines for states to develop plans to meet EPA-mandated CO2 emission performance standards for existing units (known as the Clean Power Plan or CPP). In February 2016, the U.S. Supreme Court granted a stay of the CPP, which will remain in effect through the resolution of litigation in the U.S. Court of Appeals for the District of Columbia challenging the legality of the CPP and any review by the U.S. Supreme Court. On March 28, 2017, the U.S. President signed an executive order directing agencies to review actions that potentially burden the development or use of domestically produced energy resources, including review of the CPP and other CO2 emissions rules. On October 10, 2017, the EPA published a proposed rule to repeal the CPP and, on December 28, 2017, published an advanced notice of proposed rulemaking regarding a CPP replacement rule.
In 2015, parties to the United Nations Framework Convention on Climate Change, including the United States, adopted the Paris Agreement, which established a non-binding universal framework for addressing greenhouse gas (GHG) emissions based on nationally determined contributions. On June 1, 2017, the U.S. President announced that the United States would withdraw from the Paris Agreement and begin renegotiating its terms. The ultimate impact of this agreement or any renegotiated agreement depends on its implementation by participating countries.
The EPA's GHG reporting rule requires annual reporting of GHG emissions expressed in terms of metric tons of CO2 equivalent emissions for a company's operational control of facilities. Based on ownership or financial control of facilities, the Company's 2016 GHG emissions were approximately 8 million metric tons of CO2 equivalent. The preliminary estimate of the Company's 2017 GHG emissions on the same basis is approximately 7 million metric tons of CO2 equivalent.
FERC Matters
The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies (including the Company) and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' (including the Company's) and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and natural gas distribution utilities, as authorized by their respective state PSCs or applicable state regulatory agencies.
Depreciation and Amortization
The traditional electric operating companies' and Southern Company Gas' depreciation of the original cost of utility plant in some adjacent areas.service is provided primarily by using composite straight-line rates. The FERC directedapproximate rates for 2023, 2022, and 2021 are as follows:
202320222021
Alabama Power4.1 %2.7 %2.7 %
Georgia Power3.8 %3.3 %3.3 %
Mississippi Power3.4 %3.4 %3.6 %
Southern Company Gas2.7 %2.7 %2.8 %
Depreciation studies are conducted periodically to update the composite rates. These studies are filed with the respective state PSC and/or other applicable state and federal regulatory agencies for the traditional electric operating companies (includingand the Company)natural gas distribution utilities. Effective January 1, 2023, Alabama Power's and Southern PowerGeorgia Power's depreciation rates were revised. See Note 2 for additional information.
When property, plant, and equipment subject to show why market-based rate authority should not be revokedcomposite depreciation is retired or otherwise disposed of in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies (including the Company) and Southern Power filed a request for rehearing and filed their responsenormal course of business, its original cost, together with the FERCcost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in 2015.
In December 2016, the traditional electric operating companies (including the Company) and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outsideoriginal cost of the energy auction, finding that all of these changes would provide adequate alternative mitigation forasset are retired when the traditional electric operating companies' (including the Company's) and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies (including the Company) and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' (including the Company's) and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.related property unit is retired.
On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' (including the Company's) and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies (including the Company) and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
The ultimate outcome of these matters cannot be determined at this time.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)COMBINED NOTES TO FINANCIAL STATEMENTS
Gulf Power Company 2017 Annual Report

Retail Regulatory Matters
The Company's ratesAt December 31, 2023 and charges2022, accumulated depreciation for service to retail customers are subject to the regulatory oversight of the Florida PSC. The Company's rates are a combination of base rates and several separate cost recovery clauses for specific categories of costs. These separate cost recovery clauses address such items as fuel and purchased energy costs, purchased power capacity costs, energy conservation and demand side management programs, and the costs of compliance with environmental laws and regulations. Costs not addressed through one of the specific cost recovery clauses are recovered through the Company's base rates. See Note 3 to the financial statements under "Retail Regulatory Matters" for additional information.
Retail Base Rate Cases
In the 2013 Rate Case Settlement Agreement, the Florida PSC authorized the Company to reduce depreciation and record a regulatory asset up to $62.5 million from January 2014 through June 2017. In any given month, such depreciation reduction was not to exceed the amount necessary for the retail ROE, as reported to the Florida PSC monthly, to reach the midpoint of the authorized retail ROE range then in effect. For 2014 and 2015, the Company recognized reductions in depreciation of $8.4 million and $20.1 million, respectively. No net reduction in depreciation was recorded in 2016. In 2017, the Company recognized the remaining $34.0 million reduction in depreciation.
On April 4, 2017, the Florida PSC approved the 2017 Rate Case Settlement Agreement among theSouthern Company and three intervenors with respect to the Company's request in 2016 to increase retail base rates. Among the terms of the 2017 Rate Case Settlement Agreement, theSouthern Company increased rates effective with the first billing cycle in July 2017 to provide an annual overall net customer impact of approximately $54.3 million. The net customer impactGas consisted of a $62.0 million increase in annual base revenues, less an annual purchased power capacity cost recovery clause credit for certain wholesale revenues of approximately $8 million through December 2019. In addition, the Company continued its authorized retail ROE midpoint (10.25%) and range (9.25% to 11.25%), is deemed to have a maximum equity ratio of 52.5% for all retail regulatory purposes, and implemented new dismantlement accruals effective July 1, 2017. The Company also began amortizing the regulatory asset associated with the investment balances remaining after the retirement of Plant Smith Units 1 and 2 over 15 years effective January 1, 2018 and implemented new depreciation rates effective January 1, 2018. The 2017 Rate Case Settlement Agreement also resulted in a $32.5 million write-down of the Company's ownership of Plant Scherer Unit 3, which was recorded in the first quarter 2017. The remaining issues related to the inclusion of the Company's investment in Plant Scherer Unit 3 in retail rates have been resolved as a result of the 2017 Rate Case Settlement Agreement, including recoverability of certain costs associated with the ongoing ownership and operation of the unit through the environmental cost recovery clause.
The 2017 Rate Case Settlement Agreement set forth a process for addressing the revenue requirement effects of the Tax Reform Legislation through a prospective change to the Company's base rates. Under the terms of the 2017 Rate Case Settlement Agreement, by March 1, 2018, the Company must identify the revenue requirements impacts and defer them to a regulatory asset or regulatory liability to be considered for prospective application in a change to base rates in a limited scope proceeding before the Florida PSC. In lieu of this approach, on February 14, 2018, the parties to the 2017 Rate Case Settlement Agreement filed the 2018 Tax Reform Settlement Agreement with the Florida PSC. If approved, the 2018 Tax Reform Settlement Agreement will result in annual reductions of $18.2 million to the Company's base rates and $15.6 million to the Company's environmental cost recovery rates effective beginning the first calendar month following approval.
The 2018 Tax Reform Settlement Agreement also provides for a one-time refund of $69.4 million for the retail portion of unprotected (not subject to normalization) deferred tax liabilities through the Company's fuel cost recovery rate over the remainder of 2018. In addition, a limited scope proceeding to address the flow back of protected deferred tax liabilities will be initiated by May 1, 2018 and the Company will record a regulatory liability for the related 2018 amounts eligible to be returned to customers consistent with IRS normalization principles. Unless otherwise agreed to by the parties to the 2018 Tax Reform Settlement Agreement, amounts recorded in this regulatory liability will be refunded to retail customers in 2019 through the Company's fuel cost recovery rate.
If the 2018 Tax Reform Settlement Agreement is approved, the 2017 Rate Case Settlement Agreement will be amended to increase the Company's maximum equity ratio from 52.5% to 53.5% for regulatory purposes.
The ultimate outcome of these matters cannot be determined at this time.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Cost Recovery Clauses
As discussed previously, the 2017 Rate Case Settlement Agreement resolved the remaining issues related to the Company's inclusion of certain costs associated with the ongoing ownership and operation of Plant Scherer Unit 3 in the environmental cost recovery clause and no adjustment to the environmental cost recovery clause rate approved by the Florida PSC in November 2016 was made.
On October 25, 2017, the Florida PSC approved the Company's annual clause rate request for its fuel, purchased power capacity, environmental, and energy conservation cost recovery factors for 2018. The net effect of the approved changes is a $63 million increase in annual revenues effective in January 2018, the majority of which will be offset by related expense increases.
Revenues for all cost recovery clauses, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor for fuel and purchased power will have no significant effect on the Company's revenues or net income, but will affect annual cash flow. The recovery provisions for environmental compliance and energy conservation include related expenses and a return on net average investment. See Note 1 to the financial statements under "Revenues" for additional information.
Income Tax Matters
Federal Tax Reform Legislation
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation, among other things, reduces the federal corporate income tax rate to 21%, retains normalization provisions for public utility property and existing renewable energy incentives, and repeals the corporate alternative minimum tax.
Regulated utility businesses can continue deducting all business interest expense and are not eligible for bonus depreciation on capital assets acquired and placedplant in service after September 27, 2017. Projects with binding contracts before September 28, 2017totaling $36.6 billion and placed in service after September 27, 2017 remain eligible$34.3 billion, respectively, for bonus depreciation under the Protecting Americans from Tax Hikes (PATH) Act.
In addition, under the Tax Reform Legislation, net operating losses (NOLs) generated after December 31, 2017 can no longer be carried back to previous tax years but can be carried forward indefinitely, with utilization limited to 80% of taxable income in the subsequent tax year.
For the year ended December 31, 2017, implementation of the Tax Reform Legislation resulted in a $25 million decrease in regulatory assetsSouthern Company and a $456 million increase in regulatory liabilities, primarily due to the impact of the reduction of the corporate income tax rate on deferred tax assets$5.3 billion and liabilities.
The Tax Reform Legislation is subject to further interpretation and guidance from the IRS,$5.1 billion, respectively, for Southern Company Gas, as well as each respective state's adoption. In addition,other plant in service totaling $1.1 billion and $1.0 billion, respectively, for Southern Company and $210 million and $184 million, respectively, for Southern Company Gas. Other plant in service includes the regulatory treatmentnon-utility assets of Southern Company Gas, as well as, for Southern Company, certain impactsother non-utility subsidiaries. Depreciation of the Tax Reform Legislationoriginal cost of other plant in service is subjectprovided primarily on a straight-line basis over estimated useful lives. Useful lives for Southern Company Gas's non-utility assets range from five to 12 years for transportation equipment, 30 to 75 years for storage facilities, and up to 75 years for other assets. Useful lives for the assets of Southern Company's other non-utility subsidiaries range up to 30 years.
Southern Power
Southern Power applies component depreciation, where depreciation is computed principally by the straight-line method over the estimated useful life of the asset. Certain of Southern Power's generation assets related to natural gas-fired facilities are depreciated on a units-of-production basis, using hours or starts, to better match outage and maintenance costs to the discretionusage of, and revenues from, these assets. The primary assets in Southern Power's property, plant, and equipment are generating facilities, which generally have estimated useful lives as follows:
Southern Power Generating FacilityUseful life
Natural gasUp to 50 years
SolarUp to 35 years
WindUp to 35 years
When Southern Power's depreciable property, plant, and equipment is retired, or otherwise disposed of in the Florida PSCnormal course of business, the applicable cost and accumulated depreciation is removed and a gain or loss is recognized in the FERC. On January 31, 2018, SCS,statements of income. Southern Power reviews its estimated useful lives and salvage values on behalf of the traditional electric operating companies (including the Company), filed with the FERC a reduction to the Company's open access transmission tariff charge for 2018 to reflect the revised federal corporate tax rate. See Note 3 to the financial statements under "Regulatory Matters" for additional information regarding the Company's rate filing to reflect the impacts of the Tax Reform Legislation.
See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
an ongoing basis. The ultimate outcomeresults of these matters cannot be determined at this time.
Bonus Depreciation
Under the Tax Reform Legislation, projects with binding contracts prior to September 28, 2017 and placedreviews could result in service after September 27, 2017 remain eligible for bonus depreciation under the PATH Act. The PATH Act allowed for 50% bonus depreciation for 2015 through 2017, 40% bonus depreciation for 2018, and 30% bonus depreciation for 2019 and certain long-lived assets placed in service in 2020. Based on provisional estimates, approximately $20 million of positive cash flows is expected to result from bonus depreciation for the 2017 tax year and approximately $10 million for the 2018 tax year. Should Southern Company have a NOL in 2018, all of these cash flows may not be fully realized in 2018. See Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
Other Matters
As a result of the cost to comply with environmental regulations imposed by the EPA, the Company retired its coal-fired generation at Plant Smith Units 1 and 2 in March 2016. In August 2016, the Florida PSC approved the Company's request to

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

reclassify the remaining net book value of Plant Smith Units 1 and 2 and the remaining materials and supplies associated with these units as of the retirement date, totaling approximately $63 million, to a regulatory asset. The Company began amortizing the investment balances over 15 years effective January 1, 2018 in accordance with the 2017 Rate Case Settlement Agreement.
The Company is involved in various other matters being litigated and regulatory matters thatchanges which could affect future earnings. In addition, the Company is subject to certain claims and legal actions arising in the ordinary course of business. The Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements, such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters. The ultimate outcome of such pending or potential litigation or regulatory matters cannot be predicted at this time; however, for current proceedings not specifically reported herein or in Note 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements. See Note 3 to the financial statements for a discussion of various other contingencies, regulatory matters, and other matters being litigated which may affect future earnings potential.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Company prepares its financial statements in accordance with GAAP. Significant accounting policies are described in Note 1 to the financial statements. In the application of these policies, certain estimates are made that may have a material impact on the Company's results of operations and related disclosures. Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed the following critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Utility Regulation
The Company is subject to retail regulation by the Florida PSC. The Florida PSC sets the rates the Company is permitted to charge customers based on allowable costs. The Company is also subject to cost-based regulation by the FERC with respect to wholesale transmission rates. As a result, the Company applies accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards has a further effect on the Company's financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the Company; therefore, the accounting estimates inherent in specific costs such as depreciation, AROs, and pension and other postretirement benefits have less of a direct impact on the Company's results of operations and financial condition than they would on a non-regulated company.
As reflected in Note 1 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact the amounts of such regulatory assets and liabilities and could adversely impact the Company's financial statements.Power's net income.
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Gulf Power Company 2017 Annual Report

Joint Ownership Agreements
Federal Tax Reform LegislationAt December 31, 2023, the Registrants' percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation were as follows:
Following the enactment
Facility (Type)Percent
Ownership
Plant in ServiceAccumulated
Depreciation
CWIP
(in millions)
Alabama Power
Greene County (natural gas) Units 1 and 260.0 %(a)$191 $113 $
Plant Miller (coal) Units 1 and 291.8 (b)2,156 778 40 
Georgia Power
Plant Hatch (nuclear) Units 1 and 250.1 %(c)$1,446 $659 $70 
Plant Vogtle (nuclear) Units 1 and 245.7 (c)3,664 2,331 62 
Plant Vogtle (nuclear) Units 3 and 445.7 (c)(d)4,613 19 3,232 
Plant Scherer (coal) Units 1 and 28.4 (c)287 123 
Plant Scherer (coal) Unit 375.0 (c)1,310 639 10 
Rocky Mountain (pumped storage)25.4 (e)181 153 — 
Mississippi Power
Greene County (natural gas) Units 1 and 240.0 %(a)$125 $80 $— 
Plant Daniel (coal) Units 1 and 250.0 (f)805 281 
Southern Company Gas
Dalton Pipeline (natural gas pipeline)50.0 %(g)$271 $27 $— 
(a)Jointly owned by Alabama Power and Mississippi Power and operated and maintained by Alabama Power.
(b)Jointly owned with PowerSouth and operated and maintained by Alabama Power.
(c)Georgia Power owns undivided interests in Plants Hatch, Vogtle, and Scherer in varying amounts jointly with one or more of the Tax Reform Legislation,following entities: OPC, MEAG Power, Dalton, FP&L, and JEA. Georgia Power has been contracted to operate and maintain the SEC staff issued Staff Accounting Bulletin 118plants as agent for the co-owners and is jointly and severally liable for third party claims related to these plants.
(d)Unit 4 remains under construction. See Note 2 under "Georgia Power"Income Tax Accounting ImplicationsNuclear Construction" for additional information.
(e)Jointly owned with OPC, which is the operator of the Tax Cutsplant.
(f)Jointly owned by FP&L and Jobs Act" (SAB 118)Mississippi Power. In accordance with the operating agreement, Mississippi Power acts as FP&L's agent with respect to the operation and maintenance of these units. See Note 3 under "Other Matters – Mississippi Power – Plant Daniel" for additional information.
(g)Jointly owned with The Williams Companies, Inc., which provides forthe Dalton Pipeline is a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects115-mile natural gas pipeline that serves as an extension of the legislation. DueTranscontinental Gas Pipe Line Company, LLC pipeline system into northwest Georgia. Southern Company Gas leases its 50% undivided ownership for approximately $26 million annually through 2042. The lessee is responsible for maintaining the pipeline during the lease term and for providing service to transportation customers under its FERC-regulated tariff.
The Registrants' proportionate share of their jointly-owned facility operating expenses is included in the complexcorresponding operating expenses in the statements of income and comprehensive natureeach Registrant is responsible for providing its own financing.
Assets Subject to Lien
Mississippi Power provides retail service to its largest retail customer, Chevron Products Company (Chevron), at its refinery in Pascagoula, Mississippi through at least 2038 in accordance with agreements approved by the Mississippi PSC. The agreements grant Chevron a security interest in the co-generation assets located at the refinery and owned by Mississippi Power, with a lease receivable balance of $147 million at December 31, 2023, that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the enacted tax law changes, and their applicationthree rating agencies. See Note 9 under GAAP, the Company considers all amounts recorded in the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of the Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Notes 3 and 5 to the financial statements under "Retail Regulatory Matters" and "Current and Deferred Income Taxes," respectively,"Lessor" for additional information.
Asset Retirement ObligationsSee Note 8 under "Long-term Debt" for information regarding debt secured by certain assets of Georgia Power and Southern Company Gas.
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Table of ContentsIndex to Financial Statements

COMBINED NOTES TO FINANCIAL STATEMENTS

6. ASSET RETIREMENT OBLIGATIONS
AROs are computed as the fairpresent value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. Each traditional electric operating company and natural gas distribution utility has received accounting guidance from its state PSC or applicable state regulatory agency allowing the continued accrual or recovery of other retirement costs for long-lived assets that it does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as regulatory liabilities and amounts to be recovered are reflected in the balance sheets as regulatory assets.
The liabilityARO liabilities for AROsthe traditional electric operating companies primarily relatesrelate to the Company's facilities that are subject to the CCR Rule and to the closure of anrelated state rules, principally ash pond at Plant Scholz.ponds. In addition, the Company hasAlabama Power and Georgia Power have retirement obligations related to combustion turbines at its Pea Ridge facility,the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 through 3). See "Nuclear Decommissioning" herein for additional information. Other significant AROs include various landfill sites a barge unloading dock,and asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power. The ARO liability for Southern Power primarily relates to its solar and wind facilities, which are located on long-term land leases requiring the restoration of land at the end of the lease.
The traditional electric operating companies and Southern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers. Thetransformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company also has identified retirement obligations related to certain transmissionsystem's rail lines and distribution facilities, certain wireless communication towers, and certain structures authorized by the U.S. Army Corps of Engineers.natural gas pipelines. However, liabilities for the removal of these assets have not been recorded because the settlement timing for thecertain retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROsretirement obligations will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.
The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure for those facilities impacted by the CCR Rule. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
Given the significant judgment involved in estimating AROs, the Company considers the liabilities for AROs to be critical accounting estimates.
Pension and Other Postretirement Benefits
The Company's calculation of pension and other postretirement benefits expense is dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term return on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the Company believes that the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect its pension and other postretirement benefits costs and obligations.
Key elements in determining the Company's pension and other postretirement benefit expense are the expected long-term return on plan assets and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. The expected long-term return on pension and other postretirement benefit plan assets is based on the Company's investment strategy, historical experience, and expectations for long-term rates of return that consider external actuarial advice. The Company determines the long-term return on plan assets by applying the long-term rate of expected returns on various asset classes to the Company's target asset allocation. For purposes of determining its liability related to the pension and other postretirement benefit plans, the Company discounts the future related cash flows using a single-point discount rate developed

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. For 2015 and prior years, the Company computed the interest cost component of its net periodic pension and other postretirement benefit plan expense using the same single-point discount rate. Beginning in 2016, the Company adopted a full yield curve approach for calculating the interest cost component whereby the discount rate for each year is applied to the liability for that specific year. As a result, the interest cost component of net periodic pension and other postretirement benefit plan expense decreased by approximately $4 million in 2016.
A 25 basis point change in any significant assumption (discount rate, salaries, or long-term return on plan assets) would result in a $2 million or less change in total annual benefit expense and a $25 million or less change in projected obligations.
See Note 2 to the financial statements for additional information regarding pension and other postretirement benefits.
Contingent Obligations
The Company is subject to a number of federal and state laws and regulations, as well as other factors and conditions that subject it to environmental, litigation, and other risks. See FUTURE EARNINGS POTENTIAL herein and Note 3 to the financial statements for more information regarding certain of these contingencies. The Company periodically evaluates its exposure to such risks and records reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the Company's results of operations, cash flows, or financial condition.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed separately from revenues under ASC 606. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to a PPA, cellular towers, and barges where the Company is the lessee and to outdoor lighting and power distribution equipment where the Company is the lessor. The Company is currently analyzing pole attachment agreements and a lease

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
FINANCIAL CONDITION AND LIQUIDITY
Overview
The Company's financial condition remained stable at December 31, 2017. The Company's cash requirements primarily consist of funding ongoing operations, common stock dividends, capital expenditures, and debt maturities. Capital expenditures and other investing activities include investments to meet projected long-term demand requirements, to maintain existing facilities, to comply with environmental regulations including adding environmental modifications to existing generating units, to expand and improve transmission and distribution facilities, and for restoration following major storms. Operating cash flows provide a substantial portion of the Company's cash needs. For the three-year period from 2018 through 2020, the Company's projected common stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows. The Company plans to finance future cash needs in excess of its operating cash flows primarily through external security issuances, equity contributions from Southern Company and borrowings from financial institutions. The Company plans to use commercial paper to manage seasonal variations in operating cash flows and for other working capital needs. The Company intends to continue to monitor its access to short-term and long-term capital markets as well as bank credit agreements to meet future capital and liquidity needs. See "Sources of Capital," "Financing Activities," and "Capital Requirements and Contractual Obligations" herein for additional information.
The Company's investments in the qualified pension plan increased in value as of December 31, 2017 as compared to December 31, 2016. No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated during 2018. See Note 2 to the financial statements under "Pension Plans" for additional information.
Net cash provided from operating activities totaled $356 million in 2017, a decrease of $23 million from 2016, primarily due to decreases in cash flows related to the timing of fossil fuel stock purchases and clause recovery, partially offset by increases related to voluntary contributions to the qualified pension plan in 2016. Net cash provided from operating activities totaled $379 million in 2016, a decrease of $81 million from 2015, primarily due to decreases in cash flows related to clause recovery and a voluntary contribution to the qualified pension plan, partially offset by the timing of fossil fuel stock purchases.
Net cash used for investing activities totaled $234 million, $180 million, and $281 million for 2017, 2016, and 2015, respectively. The changes in cash used for investing activities were primarily related to gross property additions for environmental, distribution, steam generation, and transmission assets. Funds for the Company's property additions were provided by operating activities, capital contributions, and other financing activities.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Net cash used for financing activities totaled $150 million in 2017 primarily due to the payment of short-term debt, the payment of common stock dividends, and the redemption of preferred stock, partially offset by the proceeds of the issuance of long-term debt and common stock. Net cash used for financing activities totaled $217 million in 2016 primarily due to the redemptions of long-term debt and the payment of common stock dividends, partially offset by an increase in notes payable. Net cash used for financing activities totaled $144 million in 2015 primarily due to the payment of common stock dividends and redemptions of long-term debt, partially offset by an increase in notes payable and proceeds from the issuance of common stock to Southern Company. Fluctuations in cash flow from financing activities vary from year to year based on capital needs and the maturity or redemption of securities.
Significant balance sheet changes in 2017 primarily reflect the financing activities described above. Other significant changes, which resulted from the Tax Reform Legislation, included an increase in deferred credits related to income taxes and a decrease in accumulated deferred income taxes. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Notes 3 and 5 to the financial statements under "Retail Regulatory Matters" and "Current and Deferred Income Taxes," respectively, for additional information and related proposed regulatory treatment.
The Company's ratio of common equity to total capitalization plus short-term debt, was 53.5% and 48.3% at December 31, 2017 and 2016, respectively. See Note 6 to the financial statements for additional information.
Sources of Capital
The Company plans to obtain the funds required to meet its future capital needs from sources similar to those used in the past, which were primarily from operating cash flows, external security issuances, borrowings from financial institutions, and equity contributions from Southern Company. However, the amount, type, and timing of any future financings, if needed, will depend upon regulatory approval, prevailing market conditions, and other factors.
The issuance of securities by the Company is subject to annual approval by the Florida PSC. Additionally, with respect to the public offering of securities, the Company files registration statements with the SEC under the Securities Act of 1933, as amended (1933 Act). The amounts of securities authorized by the Florida PSC, as well as the amounts registered under the 1933 Act, are continuously monitored and appropriate filings are made to ensure flexibility in the capital markets.
The Company obtains financing separately without credit support from any affiliate. See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information. The Southern Company system does not maintain a centralized cash or money pool. Therefore, funds of the Company are not commingled with funds of any other company in the Southern Company system.
The Company's current liabilities may exceed current assets because of scheduled maturities of long-term debt and the periodic use of short-term debt as a funding source, as well as significant seasonal fluctuations in cash needs.
The Company intends to utilize operating cash flows, external security issuances, and borrowings from financial institutions to fund its short-term capital needs. The Company has substantial cash flow from operating activities and access to the capital markets and financial institutions to meet short-term liquidity needs.
At December 31, 2017, the Company had approximately $28 million of cash and cash equivalents. Committed credit arrangements with banks at December 31, 2017 were as follows:
Expires     
Executable
Term Loans
 Expires Within One Year
201820192020 Total Unused 
One
Year
 
Two
Years
 Term Out No Term Out
(in millions) (in millions) (in millions) (in millions)
$30$25$225 $280 $280 $45 $— $20 $10
See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
In November 2017, the Company amended $195 million of its multi-year credit arrangements to extend the maturity dates from 2017 and 2018 to 2020.
Most of these bank credit arrangements contain covenants that limit debt levels and contain cross-acceleration provisions to other indebtedness (including guarantee obligations) of the Company. Such cross-acceleration provisions to other indebtedness would trigger an event of default if the Company defaulted on indebtedness, the payment of which was then accelerated. At December 31, 2017, the Company was in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowings.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Subject to applicable market conditions, the Company expects to renew or replace its bank credit arrangements, as needed, prior to expiration. In connection therewith, the Company may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
Most of the unused credit arrangements with banks are allocated to provide liquidity support to the Company's pollution control revenue bonds and commercial paper program. The amount of variable rate pollution control revenue bonds outstanding requiring liquidity support as of December 31, 2017 was approximately $82 million. In addition, at December 31, 2017, the Company had $75 million of fixed rate pollution control revenue bonds outstanding that were required to be remarketed within the next 12 months.
The Company may also meet short-term cash needs through a Southern Company subsidiary organized to issue and sell commercial paper at the request and for the benefit of the Company and the other traditional electric operating companies. Proceeds from such issuances for the benefit of the Company are loaned directly to the Company. The obligations of each traditional electric operating company under these arrangements are several and there is no cross-affiliate credit support. Short-term borrowings are included in notes payable on the balance sheets.
Details of short-term borrowings were as follows:
 Short-term Debt at the End of the Period 
Short-term Debt During the Period (*)
 Amount Outstanding Weighted Average Interest Rate Average Amount Outstanding Weighted Average Interest Rate Maximum Amount Outstanding
 (in millions)   (in millions)   (in millions)
December 31, 2017         
Commercial paper$45
 2.0% $20
 1.3% $168
Short-term bank debt
 % 38
 1.6% 100
Total$45
 2.0% $58
 1.5%  
December 31, 2016         
Commercial paper$168
 1.1% $53
 0.9% $168
Short-term bank debt100
 1.5% 64
 1.3% 100
Total$268
 1.2% $117
 1.1%  
December 31, 2015         
Commercial paper$142
 0.7% $101
 0.4% $175
Short-term bank debt
 % 10
 0.7% 40
Total$142
 0.7% $111
 0.4%  
(*)Average and maximum amounts are based upon daily balances during the year.
The Company believes the need for working capital can be adequately met by utilizing the commercial paper program, lines of credit, short-term bank term loans, and operating cash flows.
Financing Activities
In January 2017, the Company issued 1,750,000 shares of common stock to Southern Company and realized proceeds of $175 million. The proceeds were used for general corporate purposes, including the Company's continuous construction program.
In March 2017, the Company extended the maturity of a $100 million short-term floating rate bank loan bearing interest based on one-month LIBOR from April 2017 to October 2017 and subsequently repaid the loan in May 2017.
In May 2017, the Company issued $300 million aggregate principal amount of Series 2017A 3.30% Senior Notes due May 30, 2027. The proceeds, together with other funds, were used to repay at maturity $85 million aggregate principal amount of Series 2007A 5.90% Senior Notes due June 15, 2017; to repay outstanding commercial paper borrowings; to repay a $100 million short-term floating rate bank loan, as discussed above; and to redeem, in June 2017, 550,000 shares ($55 million aggregate liquidation amount) of 6.00% Series Preference Stock, 450,000 shares ($45 million aggregate liquidation amount) of Series 2007A 6.45% Preference Stock, and 500,000 shares ($50 million aggregate liquidation amount) of Series 2013A 5.60% Preference Stock.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

In addition to any financings that may be necessary to meet capital requirements, contractual obligations, and storm recovery, the Company plans to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Credit Rating Risk
At December 31, 2017, the Company did not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change to BBB- and/or Baa3 or below. These contracts are for physical electricity purchases and sales, fuel transportation and storage, and energy price risk management.
The maximum potential collateral requirements under these contracts at December 31, 2017 were as follows:
Credit Ratings
Maximum
Potential
Collateral
Requirements
 (in millions)
At BBB- and/or Baa3$167
Below BBB- and/or Baa3$562
Included in these amounts are certain agreements that could require collateral in the event that Alabama Power or Georgia Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Company to access capital markets and would be likely to impact the cost at which it does so.
On March 24, 2017, S&P revised its consolidated credit rating outlook for Southern Company and its subsidiaries (including the Company) from stable to negative.
While it is unclear how the credit rating agencies, the FERC, and the Florida PSC may respond to the Tax Reform Legislation, certain financial metrics, such as the funds from operations to debt percentage, used by the credit rating agencies to assess Southern Company and its subsidiaries, including the Company, may be negatively impacted. The Company intends to work with the Florida PSC, including working towards approval of the 2018 Tax Reform Settlement Agreement, to mitigate the adverse impacts, if any, to certain credit metrics. See Note 3 to the financial statements under "Retail Regulatory Matters" for additional information.
Market Price Risk
Due to cost-based rate regulation and other various cost recovery mechanisms, the Company continues to have limited exposure to market volatility in interest rates, commodity fuel prices, and prices of electricity. To manage the volatility attributable to these exposures, the Company nets the exposures, where possible, to take advantage of natural offsets and may enter into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis.
To mitigate future exposure to changes in interest rates, the Company may enter into derivatives which are designated as hedges. The weighted average interest rate on $82 million of outstanding variable rate long-term debt that has not been hedged at December 31, 2017 was 1.85%. If the Company sustained a 100 basis point change in interest rates for all variable rate long-term debt, the change would not materially affect annualized interest expense at December 31, 2017. See Note 1 to the financial statements under "Financial Instruments" and Note 10 to the financial statements for additional information.
To mitigate residual risks relative to movements in fuel and electricity prices, the Company enters into financial hedge contracts for natural gas purchases and physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market. The Company continues to manage a fuel-hedging program implemented per the guidelines of the Florida PSC and the actual cost of fuel is recovered through the retail fuel clause. The Florida PSC extended the moratorium on the Company's fuel-hedging program until January 1, 2021 in connection with the 2017 Rate Case Settlement Agreement. The moratorium does not have an impact on the recovery of existing hedges entered into under the previously-approved hedging program. The

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Company had no material change in market risk exposure for the year ended December 31, 2017 when compared to the year ended December 31, 2016.
The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. For the years ended December 31, the changes in fair value of energy-related derivative contracts, substantially all of which are composed of regulatory hedges, were as follows:
 
2017
Changes
 
2016
Changes
 Fair Value
 (in millions)
Contracts outstanding at the beginning of the period, assets (liabilities), net$(24) $(100)
Contracts realized or settled17
 49
Current period changes(*)
(14) 27
Contracts outstanding at the end of the period, assets (liabilities), net$(21) $(24)
(*)Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
The net hedge volumes of energy-related derivative contracts were 22 million mmBtu and 51 million mmBtu as of December 31, 2017 and December 31, 2016, respectively.
The weighted average swap contract cost above market prices was approximately $0.95 per mmBtu as of December 31, 2017 and $0.48 per mmBtu as of December 31, 2016. Natural gas settlements are recovered through the Company's fuel cost recovery clause.
At December 31, 2017 and 2016, substantially all of the Company's energy-related derivative contracts were designated as regulatory hedges and were related to the Company's fuel-hedging program. Therefore, gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as they are recovered through the fuel cost recovery clause. Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred and were not material for any year presented and the actual cost of fuel is recovered through the retail fuel clause.
The Company uses over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. See Note 9 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts, which are all Level 2 of the fair value hierarchy, at December 31, 2017 were as follows:
 
Fair Value Measurements
December 31, 2017
 Total Maturity
 Fair Value Year 1 Years 2&3 Years 4&5
 (in millions)
Level 1$
 $
 $
 $
Level 2(21) (14) (7) 
Level 3
 
 
 
Fair value of contracts outstanding at end of period$(21) $(14) $(7) $
The Company is exposed to market price risk in the event of nonperformance by counterparties to the energy-related derivative contracts. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P, or with counterparties who have posted collateral to cover potential credit exposure. Therefore, the Company does not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 10 to the financial statements.
Capital Requirements and Contractual Obligations
The construction program of the Company is currently estimated to total $304 million for 2018, $266 million for 2019, $358 million for 2020, $279 million for 2021, and $229 million for 2022. These amounts include capital expenditures related to contractual purchase commitments for capital expenditures covered under long-term service agreements. Estimated capital

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

expenditures to comply with environmental laws and regulations included in these amounts are $65 million, $57 million, $83 million, $58 million, and $16 million for 2018, 2019, 2020, 2021, and 2022, respectively. These estimated expenditures do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" and "– Global Climate Issues" herein for additional information.
The Company also anticipates costs associated with closure and monitoring of ash ponds at Plant Scholz and in accordance with the CCR Rule, which are reflected in the Company's ARO liabilities. These costs, which could change as the Company continues to refine its assumptions underlying the cost estimates and evaluate the method and timing of compliance activities, are estimated to be $35 million, $11 million, $12 million, $18 million, and $4 million for the years 2018, 2019, 2020, 2021, and 2022, respectively. See Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
The construction program is subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; storm impacts; changes in environmental laws and regulations; the outcome of any legal challenges to the environmental rules; changes in generating plants, including unit retirements and replacements and adding or changing fuel sources at existing generating units, to meet regulatory requirements; changes in the expected environmental compliance program; changes in FERC rules and regulations; Florida PSC approvals; changes in legislation; the cost and efficiency of construction labor, equipment, and materials; project scope and design changes; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures will be fully recovered.
In addition, as discussed in Note 2 to the financial statements, the Company provides postretirement benefits to substantially all employees and funds trusts to the extent required by the FERC and the Florida PSC.
Other funding requirements related to obligations associated with scheduled maturities of long-term debt, as well as the related interest, derivative obligations, leases, pension and post-retirement benefit plans, and other purchase commitments are detailed in the contractual obligations table that follows. See Notes 1, 2, 5, 6, 7, and 10 to the financial statements for additional information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Contractual Obligations
Contractual obligations at December 31, 2017 were as follows:
 2018 
2019-
2020
 
2021-
2022
 
After
2022
 Total
 (in millions)
Long-term debt(a) –
         
Principal$
 $175
 $141
 $983
 $1,299
Interest48
 95
 79
 554
 776
Financial derivative obligations(b)
14
 7
 
 
 21
Operating leases(c)
8
 4
 3
 4
 19
Purchase commitments –         
Capital(d)
304
 594
 508
 
 1,406
Fuel(e)
211
 247
 132
 44
 634
Purchased power(f)
129
 266
 275
 906
 1,576
Other(g)
16
 34
 36
 119
 205
Pension and other postretirement benefit plans(h)
5
 11
 
 
 16
Total$735
 $1,433
 $1,174
 $2,610
 $5,952
(a)All amounts are reflected based on final maturity dates. The Company plans to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit. Variable rate interest obligations are estimated based on rates as of December 31, 2017, as reflected in the statements of capitalization. Fixed rates include, where applicable, the effects of interest rate derivatives employed to manage interest rate risk.
(b)See Notes 1 and 10 to the financial statements for additional information.
(c)Excludes a PPA accounted for as a lease, which is included in "Purchased power."
(d)The Company provides estimated capital expenditures for a five-year period, including capital expenditures associated with environmental regulations. These amounts exclude capital expenditures covered under long-term service agreements, which are reflected in "Other." At December 31, 2017, significant purchase commitments were outstanding in connection with the construction program. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" for additional information.
(e)Includes commitments to purchase coal and natural gas, as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery. Amounts reflected for natural gas purchase commitments have been estimated based on the New York Mercantile Exchange future prices at December 31, 2017.
(f)The capacity and transmission related costs associated with PPAs are recovered through the purchased power capacity cost recovery clause. Energy costs associated with PPAs are recovered through the fuel cost recovery clause. See Notes 3 and 7 to the financial statements for additional information.
(g)Includes long-term service agreements and contracts for the procurement of limestone. Long-term service agreements include price escalation based on inflation indices. Limestone costs are recovered through the environmental cost recovery clause. See Note 3 to the financial statements for additional information.
(h)The Company forecasts contributions to the pension and other postretirement benefit plans over a three-year period. The Company anticipates no mandatory contributions to the qualified pension plan during the next three years. Amounts presented represent estimated benefit payments for the nonqualified pension plans, estimated non-trust benefit payments for the other postretirement benefit plans, and estimated contributions to the other postretirement benefit plan trusts, all of which will be made from the Company's corporate assets. See Note 2 to the financial statements for additional information related to the pension and other postretirement benefit plans, including estimated benefit payments. Certain benefit payments will be made through the related benefit plans. Other benefit payments will be made from the Company's corporate assets.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

Cautionary Statement Regarding Forward-Looking Statements
The Company's 2017 Annual Report contains forward-looking statements. Forward-looking statements include, among other things, statements concerning retail rates, customer and sales growth, economic conditions, fuel and environmental cost recovery and other rate actions, current and proposed environmental regulations and related compliance plans and estimated expenditures, pending or potential litigation matters, access to sources of capital, projections for the qualified pension plan and postretirement benefit plans contributions, financing activities, start and completion of construction projects, filings with state and federal regulatory authorities, impacts of the Tax Reform Legislation, federal income tax benefits, estimated sales and purchases under power sale and purchase agreements, and estimated construction and other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:
the impact of recent and future federal and state regulatory changes, including environmental laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which the Company is subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulations and IRS interpretations, actions that may be taken in response by regulatory authorities, and its impact, if any, on the credit ratings of the Company;
current and future litigation or regulatory investigations, proceedings, or inquiries;
the effects, extent, and timing of the entry of additional competition in the markets in which the Company operates;
variations in demand for electricity, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures, including from the development and deployment of alternative energy sources such as self-generation and distributed generation technologies, and any potential economic impacts resulting from federal fiscal decisions;
available sources and costs of fuels;
effects of inflation;
the ability to control costs and avoid cost overruns during the development and construction of facilities, to construct facilities in accordance with the requirements of permits and licenses, and to satisfy any environmental performance standards;
investment performance of the Company's employee and retiree benefit plans;
advances in technology;
state and federal rate regulations and the impact of pending and future rate cases and negotiations, including rate actions relating to fuel and other cost recovery mechanisms;
the ability to successfully operate generating, transmission, and distribution facilities and the successful performance of necessary corporate functions;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, which cannot be assured to be completed or beneficial to the Company;
the ability of counterparties of the Company to make payments as and when due and to perform as required;
the ability to obtain new short- and long-term contracts with wholesale customers;
the direct or indirect effect on the Company's business resulting from cyber intrusion or physical attack and the threat of physical attacks;
interest rate fluctuations and financial market conditions and the results of financing efforts;
changes in the Company's credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general;
the ability of the Company to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Gulf Power Company 2017 Annual Report

catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events such as influenzas, or other similar occurrences;
the direct or indirect effects on the Company's business resulting from incidents affecting the U.S. electric grid or operation of generating resources;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by the Company from time to time with the SEC.
The Company expressly disclaims any obligation to update any forward-looking statements.

STATEMENTS OF INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Gulf Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Revenues:     
Retail revenues$1,281
 $1,281
 $1,249
Wholesale revenues, non-affiliates57
 61
 107
Wholesale revenues, affiliates108
 75
 58
Other revenues70
 68
 69
Total operating revenues1,516
 1,485
 1,483
Operating Expenses:     
Fuel427
 432
 445
Purchased power155
 142
 135
Other operations and maintenance359
 336
 354
Depreciation and amortization137
 172
 141
Taxes other than income taxes116
 120
 118
Loss on Plant Scherer Unit 333
 
 
Total operating expenses1,227
 1,202
 1,193
Operating Income289
 283
 290
Other Income and (Expense):     
Interest expense, net of amounts capitalized(50) (47) (49)
Other income (expense), net(10) (5) 8
Total other income and (expense)(60) (52) (41)
Earnings Before Income Taxes229
 231
 249
Income taxes90
 91
 92
Net Income139
 140
 157
Dividends on Preference Stock4
 9
 9
Net Income After Dividends on Preference Stock$135
 $131
 $148
The accompanying notes are an integral part of these financial statements.

STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Gulf Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Net Income$139
 $140
 $157
Other comprehensive income (loss):     
Qualifying hedges:     
Changes in fair value, net of tax of $(1), $-, and $-, respectively(1) 1
 1
Total other comprehensive income (loss)(1) 1
 1
Comprehensive Income$138
 $141
 $158
The accompanying notes are an integral part of these financial statements.

STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2017, 2016, and 2015
Gulf Power Company 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Activities:     
Net income$139
 $140
 $157
Adjustments to reconcile net income
to net cash provided from operating activities —
     
Depreciation and amortization, total149
 179
 152
Deferred income taxes72
 57
 90
Pension and postretirement funding
 (48) 
Loss on Plant Scherer Unit 333
 
 
Other, net(3) (3) 4
Changes in certain current assets and liabilities —     
-Receivables(43) 15
 33
-Fossil fuel stock8
 37
 (6)
-Prepaid income taxes8
 (11) 32
-Other current assets(2) (1) (2)
-Accounts payable20
 5
 (22)
-Over recovered regulatory clause revenues(12) 1
 22
-Other current liabilities(13) 8
 
Net cash provided from operating activities356
 379
 460
Investing Activities:     
Property additions(202) (178) (235)
Cost of removal, net of salvage(21) (9) (10)
Change in construction payables(2) 13
 (28)
Other investing activities(9) (6) (8)
Net cash used for investing activities(234) (180) (281)
Financing Activities:     
Increase (decrease) in notes payable, net(223) 126
 32
Proceeds —     
Common stock issued to parent175
 
 20
Capital contributions from parent company2
 20
 4
Pollution control revenue bonds
 
 13
Senior notes300
 
 
Redemptions and repurchases —     
Preference stock(150) 
 
Senior notes(85) (235) (60)
Pollution control revenue bonds
 
 (13)
Payment of common stock dividends(165) (120) (130)
Other financing activities(4) (8) (10)
Net cash used for financing activities(150) (217) (144)
Net Change in Cash and Cash Equivalents(28) (18) 35
Cash and Cash Equivalents at Beginning of Year56
 74
 39
Cash and Cash Equivalents at End of Year$28
 $56
 $74
Supplemental Cash Flow Information:     
Cash paid (received) during the period for —     
Interest (net of $-, $-, and $6 capitalized, respectively)$46
 $53
 $52
Income taxes (net of refunds)12
 21
 (7)
Noncash transactions —     
Accrued property additions at year-end31
 33
 20
Other financing activities related to energy services(7) 
 
Receivables related to energy services7
 
 
The accompanying notes are an integral part of these financial statements.


BALANCE SHEETS
At December 31, 2017 and 2016
Gulf Power Company 2017 Annual Report
Assets2017
 2016
 (in millions)
Current Assets:   
Cash and cash equivalents$28
 $56
Receivables —   
Customer accounts receivable76
 72
Unbilled revenues67
 55
Under recovered regulatory clause revenues27
 17
Affiliated14
 17
Other accounts and notes receivable7
 6
Accumulated provision for uncollectible accounts(1) (1)
Fossil fuel stock63
 71
Materials and supplies57
 55
Other regulatory assets, current56
 44
Other current assets21
 30
Total current assets415
 422
Property, Plant, and Equipment:   
In service5,196
 5,140
Less: Accumulated provision for depreciation1,461
 1,382
Plant in service, net of depreciation3,735
 3,758
Construction work in progress91
 51
Total property, plant, and equipment3,826
 3,809
Deferred Charges and Other Assets:   
Deferred charges related to income taxes31
 58
Other regulatory assets, deferred502
 512
Other deferred charges and assets23
 21
Total deferred charges and other assets556
 591
Total Assets$4,797
 $4,822
The accompanying notes are an integral part of these financial statements.


BALANCE SHEETS
At December 31, 2017 and 2016
Gulf Power Company 2017 Annual Report
Liabilities and Stockholder's Equity2017
 2016
 (in millions)
Current Liabilities:   
Securities due within one year$
 $87
Notes payable45
 268
Accounts payable —   
Affiliated52
 59
Other75
 54
Customer deposits35
 35
Accrued taxes —   
Accrued income taxes1
 1
Other accrued taxes9
 19
Accrued interest9
 8
Accrued compensation39
 40
Deferred capacity expense, current22
 22
Other regulatory liabilities, current
 16
Asset retirement obligations, current37
 16
Other current liabilities27
 24
Total current liabilities351
 649
Long-Term Debt (See accompanying statements)
1,285
 987
Deferred Credits and Other Liabilities:   
Accumulated deferred income taxes537
 948
Deferred credits related to income taxes458
 2
Employee benefit obligations102
 96
Deferred capacity expense97
 119
Asset retirement obligations105
 120
Other cost of removal obligations221
 249
Other regulatory liabilities, deferred43
 45
Other deferred credits and liabilities67
 71
Total deferred credits and other liabilities1,630
 1,650
Total Liabilities3,266
 3,286
Preference Stock (See accompanying statements)

 147
Common Stockholder's Equity (See accompanying statements)
1,531
 1,389
Total Liabilities and Stockholder's Equity$4,797
 $4,822
Commitments and Contingent Matters (See notes)

 
The accompanying notes are an integral part of these financial statements.

STATEMENTS OF CAPITALIZATION
At December 31, 2017 and 2016
Gulf Power Company 2017 Annual Report
 2017
 2016
 2017
 2016
 (in millions) (percent of total)
Long-Term Debt:       
Long-term notes payable —       
2.93% to 5.90% due 2017$
 $87
    
4.75% due 2020175
 175
    
3.10% due 2022100
 100
    
3.30% to 5.10% due 2027-2044715
 415
    
Total long-term notes payable990
 777
    
Other long-term debt —       
Pollution control revenue bonds —       
2.10% due 202237
 37
    
1.15% to 4.45% due 2023-2049190
 190
    
Variable rate (1.83% at 12/31/17) due 20224
 4
    
Variable rates (1.85% to 1.88% at 12/31/17) due 2039-204278
 78
    
Total other long-term debt309
 309
    
Unamortized debt discount(5) (5)    
Unamortized debt issuance expense(9) (7)    
Total long-term debt (annual interest requirement — $48 million)1,285
 1,074
    
Less amount due within one year
 87
    
Long-term debt excluding amount due within one year1,285
 987
 45.6% 39.1%
Preferred and Preference Stock:       
Authorized — 20,000,000 shares — preferred stock       
— 10,000,000 shares — preference stock       
Outstanding — $100 par or stated value       
— 2017: no shares       
— 2016:       
— 6.00% preference stock — 550,000 shares (non-cumulative)
 54
    
— 6.45% preference stock — 450,000 shares (non-cumulative)
 44
    
— 5.60% preference stock — 500,000 shares (non-cumulative)
 49
    
Total preference stock
 147
 
 5.8
Common Stockholder's Equity:       
Common stock, without par value —       
Authorized — 20,000,000 shares       
Outstanding — 2017: 7,392,717 shares       
  — 2016: 5,642,717 shares678
 503
    
Paid-in capital594
 589
    
Retained earnings259
 296
    
Accumulated other comprehensive income
 1
    
Total common stockholder's equity1,531
 1,389
 54.4
 55.1
Total Capitalization$2,816
 $2,523
 100.0% 100.0%
The accompanying notes are an integral part of these financial statements.

STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2017, 2016, and 2015
Gulf Power Company 2017 Annual Report
 Number of Common Shares Issued Common Stock Paid-In Capital Retained Earnings Accumulated Other Comprehensive Income (Loss) Total
 (in millions)
Balance at December 31, 20145
 $483
 $560
 $267
 $(1) $1,309
Net income after dividends on
preference stock

 
 
 148
 
 148
Issuance of common stock1
 20
 
 
 
 20
Capital contributions from parent company
 
 7
 
 
 7
Other comprehensive income (loss)
 
 
 
 1
 1
Cash dividends on common stock
 
 
 (130) 
 (130)
Balance at December 31, 20156
 503
 567
 285
 
 1,355
Net income after dividends on
preference stock

 
 
 131
 
 131
Capital contributions from parent company
 
 22
 
 
 22
Other comprehensive income (loss)
 
 
 
 1
 1
Cash dividends on common stock
 
 
 (120) 
 (120)
Balance at December 31, 20166
 503
 589
 296
 1
 1,389
Net income after dividends on
preference stock

 
 
 135
 
 135
Issuance of common stock
 175
 
 
 
 175
Capital contributions from parent company
 
 5
 
 
 5
Other comprehensive income (loss)
 
 
 
 (1) (1)
Cash dividends on common stock
 
 
 (165) 
 (165)
Other
 
 
 (7) 
 (7)
Balance at December 31, 20176
 $678
 $594
 $259
 $
 $1,531
The accompanying notes are an integral part of these financial statements.


NOTES TO FINANCIAL STATEMENTS
Gulf Power Company 2017 Annual Report




Index to the Notes to Financial Statements



NOTES (continued)
Gulf Power Company 2017 Annual Report

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
Gulf Power Company (the Company) is a wholly-owned subsidiary of Southern Company, which is the parent company of the Company and three other traditional electric operating companies as well as Southern Power, Southern Company Gas (as of July 1, 2016), SCS, Southern Linc, Southern Company Holdings, Inc. (Southern Holdings), Southern Nuclear, PowerSecure (as of May 9, 2016), Inc. (PowerSecure), and other direct and indirect subsidiaries. The traditional electric operating companies – the Company, Alabama Power, Georgia Power, and Mississippi Power – are vertically integrated utilities providing electric service in four Southeastern states. The Company provides electric service to retail customers in northwest Florida and to wholesale customers in the Southeast. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through utilities in seven states and is involved in several other complementary businesses including gas marketing services, wholesale gas services, and gas midstream operations. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary, primarily for Southern Company's investments in leveraged leases and for other electric services. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants. PowerSecure is a provider of products and services in the areas of distributed generation, energy efficiency, and utility infrastructure.
The equity method is used for entities in which the Company has significant influence but does not control.
The Company is subject to regulation by the FERC and the Florida PSC. As such, the Company's financial statements reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by its regulatory commissions. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed separately from revenues under ASC 606. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition,

NOTES (continued)
Gulf Power Company 2017 Annual Report

measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to a PPA, cellular towers, and barges where the Company is the lessee and to outdoor lighting and power distribution equipment where the Company is the lessor. The Company is currently analyzing pole attachment agreements and a lease determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). ASU 2016-09 changes the accounting for income taxes and the cash flow presentation for share-based payment award transactions effective for fiscal years beginning after December 15, 2016. The new guidance requires all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation to be recognized as income tax expense or benefit in the income statement. Previously, the Company recognized any excess tax benefits and deficiencies related to the exercise and vesting of stock compensation as additional paid-in capital. In addition, the new guidance requires excess tax benefits for share-based payments to be included in net cash provided from operating activities rather than net cash provided from financing activities on the statement of cash flows. The Company elected to adopt the guidance in 2016 and reflect the related adjustments as of January 1, 2016. Prior year's data presented in the financial statements has not been adjusted. The Company also elected to recognize forfeitures as they occur. The new guidance did not have a material impact on the results of operations, financial position, or cash flows of the Company. See Notes 5 and 8 for disclosures impacted by ASU 2016-09.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
Affiliate Transactions
The Company has an agreement with SCS under which the following services are rendered to the Company at direct or allocated cost: general and design engineering, operations, purchasing, accounting, finance and treasury, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, and other services with respect to business and operations, construction management, and power pool transactions. Costs for these services amounted to $81 million, $80 million, and $81 million during 2017, 2016, and 2015, respectively. Cost allocation methodologies used by SCS prior to the repeal of the Public Utility Holding Company Act of 1935, as amended, were approved by the SEC. Subsequently, additional cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies.

NOTES (continued)
Gulf Power Company 2017 Annual Report

See Note 7 under "Operating Leases" for information on leases of cellular tower space for the Company's digital wireless communications equipment.
The Company has operating agreements with Georgia Power and Mississippi Power under which the Company owns a portion of Plant Scherer and Plant Daniel, respectively. Georgia Power operates Plant Scherer and Mississippi Power operates Plant Daniel. The Company reimbursed Georgia Power $11 million, $8 million, and $12 million and Mississippi Power $31 million, $26 million, and $27 million in 2017, 2016, and 2015, respectively, for its proportionate share of related expenses. See Note 4 and Note 7 under "Operating Leases" for additional information.
Total power purchased from affiliates through the power pool, included in purchased power in the statements of income, totaled $15 million, $16 million, and $35 million in 2017, 2016, and 2015, respectively.
The Company has an agreement with Alabama Power under which Alabama Power made transmission system upgrades to ensure firm delivery of energy under a non-affiliate PPA from a combined cycle plant located in Alabama. Payments by the Company to Alabama Power for the improvements were $11 million, $12 million, and $14 million in 2017, 2016, and 2015, respectively, and are expected to be approximately $10 million annually for 2018 through 2023, when the PPA expires. These costs have been approved for recovery by the Florida PSC through the Company's purchased power capacity cost recovery clause and by the FERC in the transmission facilities cost allocation tariff.
In 2016, the Company purchased a turbine rotor assembly from Southern Power for $6.8 million.
The Company provides incidental services to and receives such services from other Southern Company subsidiaries which are generally minor in duration and amount. Except as described herein, the Company neither provided nor received any material services to or from affiliates in 2017, 2016, or 2015.
The traditional electric operating companies, including the Company and Southern Power, may jointly enter into various types of wholesale energy, natural gas, and certain other contracts, either directly or through SCS, as agent. Each participating company may be jointly and severally liable for the obligations incurred under these agreements. See Note 7 under "Fuel and Purchased Power Agreements" for additional information.

NOTES (continued)
Gulf Power Company 2017 Annual Report

Regulatory Assets and Liabilities
The Company is subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process.
Regulatory assets and (liabilities) reflected in the balance sheets at December 31 relate to:
 2017
 2016
 Note
 (in millions)  
Retiree benefit plans, net$166
 $160
 (a,b)
PPA charges119
 141
 (b,c)
Closure of ash ponds80
 75
 (b,d)
Remaining book value of retired assets65
 66
 (e)
Environmental remediation52
 44
 (b,d)
Other regulatory assets, net36
 18
 (i)
Deferred income tax charges31
 56
 (f)
Deferred return on transmission upgrades25
 25
 (e)
Fuel-hedging assets, net21
 24
 (b,h)
Loss on reacquired debt17
 18
 (j)
Asset retirement obligations, net13
 7
 (b,f)
Regulatory asset, offset to other cost of removal
 29
 (e)
Deferred income tax credits(458) (2) (g)
Other cost of removal obligations(221) (278) (f)
Property damage reserve(40) (40) (e)
Over recovered regulatory clause revenues(11) (23) (k)
Total regulatory assets (liabilities), net$(105) $320
  
Note: The recovery and amortization periods for these regulatory assets and (liabilities) are as follows:
(a)Recovered and amortized over the average remaining service period, which may range up to 14 years. See Note 2 for additional information.
(b)Not earning a return as offset in rate base by a corresponding asset or liability.
(c)Recovered over the life of the PPA for periods up to six years.
(d)Recovered through the environmental cost recovery clause when the remediation or the work is performed.
(e)Recorded and recovered or amortized as approved by the Florida PSC.
(f)Asset retirement and removal assets and liabilities are recorded, and deferred income tax assets are recorded, recovered, and amortized, over the related property lives, which may range up to 65 years. Asset retirement and removal assets and liabilities will be settled and trued up following completion of the related activities.
(g)Deferred income tax liabilities are amortized over the related property lives, which may range up to 65 years. Includes the deferred tax liabilities as a result of the Tax Reform Legislation. Amortization of $71 million of the deferred tax liabilities at December 31, 2017 is expected to be determined by the Florida PSC at a later date. See Notes 3 and 5 for additional information.
(h)Fuel-hedging assets and liabilities are recorded over the life of the underlying hedged purchase contracts, which currently do not exceed four years. Upon final settlement, actual costs incurred are recovered through the fuel cost recovery clause.
(i)Comprised primarily of under recovered regulatory clause revenues. Other regulatory assets costs, with the exception of vacation pay, are recorded and recovered or amortized as approved by the Florida PSC. Vacation pay, including banked holiday pay, does not earn a return as offset in rate base by a corresponding liability; it is recorded as earned by employees and recovered as paid, generally within one year.
(j)Recovered over either the remaining life of the original issue or, if refinanced, over the life of the new issue, which may range up to 40 years.
(k)Recorded and recovered or amortized as approved by the Florida PSC, generally within one year.
In the event that a portion of the Company's operations is no longer subject to applicable accounting rules for rate regulation, the Company would be required to write off to income or reclassify to accumulated OCI related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the Company would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 3 under "Retail Regulatory Matters" for additional information.

NOTES (continued)
Gulf Power Company 2017 Annual Report

Revenues
Wholesale capacity revenues are generally recognized on a levelized basis over the appropriate contract period. Energy and other revenues are recognized as services are provided. Unbilled revenues related to retail sales are accrued at the end of each fiscal period. Electric rates for the Company include provisions to adjust billings for fluctuations in fuel costs, the energy component of purchased power costs, and certain other costs. The Company continuously monitors the over or under recovered fuel cost balance in light of the inherent variability in fuel costs. The Company is required to notify the Florida PSC if the projected fuel cost over or under recovery is expected to exceed 10% of the projected fuel revenue applicable for the period and indicate if an adjustment to the fuel cost recovery factor is being requested. The Company has similar retail cost recovery clauses for energy conservation costs, purchased power capacity costs, and environmental compliance costs. Revenues are adjusted for differences between these actual costs and amounts billed in current regulated rates. Under or over recovered regulatory clause revenues are recorded in the balance sheets and are recovered or returned to customers through adjustments to the billing factors. Annually, the Company petitions for recovery of projected costs including any true-up amounts from prior periods, and approved rates are implemented each January. See Note 3 under "Retail Regulatory Matters" for additional information.
The Company has a diversified base of customers. No single customer or industry comprises 10% or more of revenues. For all periods presented, uncollectible accounts averaged less than 1% of revenues.
Fuel Costs
Fuel costs are expensed as the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. Fuel expense and emissions allowance costs are recovered by the Company through the fuel cost recovery and environmental cost recovery rates, respectively, approved annually by the Florida PSC.
Income and Other Taxes
The Company uses the liability method of accounting for deferred income taxes and provides deferred income taxes for all significant income tax temporary differences. Federal ITCs utilized are deferred and amortized to income over the average life of the related property and state ITCs are recognized in the period in which the credit is claimed on the state income tax return. Taxes that are collected from customers on behalf of governmental agencies to be remitted to these agencies are presented net on the statements of income.
The Company recognizes tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 5 under "Unrecognized Tax Benefits" for additional information.
Property, Plant, and Equipment
Property, plant, and equipment is stated at original cost less any regulatory disallowances and impairments. Original cost includes: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and cost of equity funds used during construction.
The Company's property, plant, and equipment in service consisted of the following at December 31:
 2017 2016
 (in millions)
Generation$3,005
 $3,001
Transmission720
 706
Distribution1,282
 1,241
General188
 191
Plant acquisition adjustment1
 1
Total plant in service$5,196
 $5,140
The cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed.
Depreciation and Amortization
Depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates, which approximated 3.5% for all years presented. Depreciation studies are conducted periodically to update the composite rates. These studies are approved by the Florida PSC and the FERC. When property subject to depreciation is retired or otherwise disposed of

NOTES (continued)
Gulf Power Company 2017 Annual Report

in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the plant are retired when the related property unit is retired. As authorized in a settlement agreement approved by the Florida PSC in 2013 (2013 Rate Case Settlement Agreement), the Company was allowed to reduce depreciation and record a regulatory asset in an aggregate amount up to $62.5 million between January 2014 and June 2017. See Note 3 under "Retail Regulatory Matters – Retail Base Rate Cases" for additional information.
Asset Retirement Obligations and Other Costs of Removal
AROs are computed as the present value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. The Company has received an order from the Florida PSC allowing the continued accrual of other future retirement costs for long-lived assets that the Company does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as a regulatory liability.
The liability for AROs primarily relates to facilities that are subject to the Disposal of Coal Combustion Residuals from Electric Utilities final rule published by the EPA in 2015 (CCR Rule), principally ash ponds, and to the closure of an ash pond at Plant Scholz. In addition, the Company has retirement obligations related to combustion turbines at its Pea Ridge facility, various landfill sites, a barge unloading dock, asbestos removal, and disposal of polychlorinated biphenyls in certain transformers. The Company also has identified retirement obligations related to certain transmission and distribution facilities, certain wireless communication towers, and certain structures authorized by the U.S. Army Corps of Engineers. However, liabilities for the removal of these assets have not been recorded because the settlement timing for the retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO. The Company will continue to recognize in thetheir respective statements of income allowed removal costs in accordance with its regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability in the balance sheets as ordered by the Florida PSC, and are reflected in the balance sheets.various state PSCs.
Details of the AROs included onin the balance sheets are as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi Power
Southern Power(*)
(in millions)
Balance at December 31, 2021$11,687 $4,334 $6,824 $190 $131 
Liabilities incurred36 — 35 — — 
Liabilities settled(455)(205)(212)(20)— 
Accretion expense406 158 231 
Cash flow revisions(834)— (844)
Balance at December 31, 2022$10,840 $4,287 $6,034 $179 $144 
Liabilities incurred90  90   
Liabilities settled(617)(270)(304)(18) 
Accretion expense403 156 230 5 6 
Cash flow revisions(399)(15)(385)2  
Balance at December 31, 2023$10,317 $4,158 $5,665 $168 $150 
(*)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.
II-171

Table of ContentsIndex to Financial Statements

COMBINED NOTES TO FINANCIAL STATEMENTS

 2017 2016
 (in millions)
Balance at beginning of year$136
 $130
Liabilities incurred
 1
Liabilities settled(8) (1)
Accretion2
 4
Cash flow revisions12
 2
Balance at end of year$142
 $136
In December 2022, Georgia Power recorded a net decrease of approximately $780 million to its AROs related to the CCR Rule and the related state rule resulting from changes in estimates, including lower future inflation rates, higher discount rates, and timing of closure activities, as well as a change in closure methodology for one ash pond as approved in Georgia Power's 2022 IRP.
Following initial criticality for Plant Vogtle Unit 3 on March 6, 2023, Georgia Power recorded AROs of approximately $90 million. Subsequent to December 31, 2023, Plant Vogtle Unit 4 achieved initial criticality, which will result in Georgia Power recording AROs of approximately $118 million during the first quarter 2024. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
In September 2023 and November 2023, Georgia Power recorded net decreases of approximately $175 million and $210 million, respectively, to its AROs related to the CCR Rule and the related state rule resulting from changes in estimates, including lower future inflation rates and the timing of closure activities.
In June 2023, Alabama Power completed an updated decommissioning cost site study for Plant Farley. The estimated cost of decommissioning based on the study resulted in a decrease in Alabama Power's ARO liability of approximately $15 million. See "Nuclear Decommissioning" herein for additional information.
The cost estimates for AROs related to the disposal of CCR are based on information as ofat December 31, 20172023 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirementsand the related state rules. The traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for closureeach CCR unit as additional information related to these assumptions becomes available. Some of these updates have been, and future updates may be, material. The cost estimates for those facilities impacted by the CCR Rule. As further analysis is performedAlabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure details are developed,by removal for others. Additionally, the Company will continue to periodically update these cost estimates as necessary.
Allowance for Funds Used During Construction
The Company records AFUDC, which represents the estimated debtclosure designs and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the plant through a higher rate base and higher depreciation. The equity component of AFUDC is not included in calculating taxable income. The average annual AFUDC rate was 5.73% for all years presented. AFUDC, net of income taxes, as a percentage of net income after dividends on preference stock was 0.07%, 0.00%, and 10.8% for 2017, 2016, and 2015, respectively.

NOTES (continued)
Gulf Power Company 2017 Annual Report

Impairment of Long-Lived Assets and Intangibles
The Company evaluates long-lived assets for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance or an estimate of undiscounted future cash flows attributable to the assets, as compared with the carrying value of the assets. If an impairment has occurred, the amount of the impairment recognized is determined by either the amount of regulatory disallowance or by estimating the fair value of the assets and recording a loss if the carrying value is greater than the fair value. For assets identified as held for sale, the carrying value is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change.
Property Damage Reserve
The Company accrues for the cost of repairing damages from major storms and other uninsured property damages, including uninsured damages to transmission and distribution facilities, generation facilities, and other property. The costs of such damage are charged to the reserve. The Florida PSC approved annual accrual to the property damage reserve is $3.5 million, with a target level for the reserve between $48 million and $55 million. In accordance with a settlement agreement approved by the Florida PSC on April 4, 2017 (2017 Rate Case Settlement Agreement), the Company suspended further property damage reserve accruals effective April 2017. The Company may make discretionary accruals and is required to resume accruals of $3.5 million annually if the reserve falls below zero. The Company accrued total expenses of $3.5 million in each of 2017, 2016, and 2015. As of December 31, 2017 and 2016, the balanceplans in the Company's property damage reserve totaled approximately $40 million, which is included in other regulatory liabilities, deferred on the balance sheets.
When the property damage reserve is inadequate to cover the costStates of major storms, the Florida PSC can authorize a storm cost recovery surcharge to be applied to customer bills. As authorized in the 2017 Rate Case Settlement Agreement, the Company may initiate a storm surcharge to recover costs associated with any tropical systems named by the National Hurricane Center or other catastrophic storm events that reduce the property damage reserve in the aggregate by approximately $31 million (75% of the April 1, 2017 balance) or more. The storm surcharge would begin, on an interim basis, 60 days following the filing of a cost recovery petition, would be limited to $4.00/month for a 1,000 KWH residential customer unless the Company incurs in excess of $100 million in qualified storm recovery costs in a calendar year,Alabama and would replenish the property damage reserve to approximately $40 million. See Note 3 under "Retail Regulatory Matters – Retail Base Rate Cases" for additional details of the 2017 Rate Case Settlement Agreement.
Injuries and Damages Reserve
The Company is subject to claims and lawsuits arising in the ordinary course of business. As permitted by the Florida PSC, the Company accrues for the uninsured costs of injuries and damages by charges to income amounting to $1.6 million annually. The Florida PSC has also given the Company the flexibility to increase its annual accrual above $1.6 million to the extent the balance in the reserve does not exceed $2 million and to defer expense recognition of liabilities greater than the balance in the reserve. The cost of settling claims is charged to the reserve. The injuries and damages reserve had a balance of $2.1 million and $1.4 million at December 31, 2017, and 2016, respectively. For 2017, $1.6 million and $0.5 million are included in other current liabilities and other deferred credits and liabilities on the balance sheet, respectively. For 2016, the $1.4 million balance is included in other current liabilities on the balance sheet. There were no liabilities in excess of the reserve balance at December 31, 2017 or 2016.
Cash and Cash Equivalents
For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
Materials and Supplies
Generally, materials and supplies include the average cost of transmission, distribution, and generating plant materials. Materials are charged to inventory when purchased and then expensed or capitalized to plant, as appropriate, at weighted average cost when installed.
Fuel Inventory
Fuel inventory includes the average cost of oil, natural gas, coal, transportation, and emissions allowances. Fuel is recorded to inventory when purchased and then expensed, at weighted average cost, as used. Fuel expense and emissions allowance costs are

NOTES (continued)
Gulf Power Company 2017 Annual Report

recovered by the Company through the fuel cost recovery and environmental cost recovery rates, respectively, approved annually by the Florida PSC. Emissions allowances granted by the EPA are included in inventory at zero cost.
Financial Instruments
The Company uses derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, and electricity purchases and sales. All derivative financial instruments are recognized as either assets or liabilities on the balance sheets (included in "Other" or shown separately as "Risk Management Activities") and are measured at fair value. See Note 9 for additional information regarding fair value. Substantially all of the Company's bulk energy purchases and sales contracts that meet the definition of a derivative are excluded from fair value accounting requirements because they qualify for the "normal" scope exception, and are accounted for under the accrual method. Derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the Florida PSC approved fuel-hedging program result in the deferral of related gains and losses in OCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Any ineffectiveness arising from cash flow hedges is recognized currently in net income. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recorded on a net basis in the statements of income. Cash flows from derivatives are classified on the statement of cash flows in the same category as the hedged item. The Florida PSC extended the moratorium on the Company's fuel-hedging program until January 1, 2021 in connection with the 2017 Rate Case Settlement Agreement. The moratorium does not have an impact on the recovery of existing hedges entered into under the previously-approved hedging program. See Note 10 for additional information regarding derivatives.
The Company offsets fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a netting arrangement. Additionally, the Company had no outstanding collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2017.
The Company is exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Company has established controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk.
Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income, changes in the fair value of qualifying cash flow hedges, and reclassifications for amounts included in net income.
2. RETIREMENT BENEFITS
The Company has a defined benefit, trusteed, pension plan covering substantially all employees. This qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2018. The Company also provides certain defined benefit pension plans for a selected group of management and highly compensated employees. Benefits under these non-qualified pension plans are funded on a cash basis. In addition, the Company provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The Company funds its other postretirement trusts to the extent required by the FERC. For the year ending December 31, 2018, no other postretirement trust contributions are expected.
Actuarial Assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below.

NOTES (continued)
Gulf Power Company 2017 Annual Report

Assumptions used to determine net periodic costs:2017 2016 2015
Pension plans     
Discount rate – benefit obligations4.46% 4.71% 4.18%
Discount rate – interest costs3.82
 3.97
 4.18
Discount rate – service costs4.81
 5.04
 4.48
Expected long-term return on plan assets7.95
 8.20
 8.20
Annual salary increase4.46
 4.46
 3.59
Other postretirement benefit plans     
Discount rate – benefit obligations4.25% 4.51% 4.04%
Discount rate – interest costs3.56
 3.68
 4.04
Discount rate – service costs4.62
 4.88
 4.38
Expected long-term return on plan assets7.81
 8.05
 8.07
Annual salary increase4.46
 4.46
 3.59
Assumptions used to determine benefit obligations:2017
2016
Pension plans


Discount rate3.82%
4.46%
Annual salary increase4.46

4.46
Other postretirement benefit plans


Discount rate3.69%
4.25%
Annual salary increase4.46

4.46
The Company estimates the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of eight different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio.
An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO as of December 31, 2017 were as follows:
 Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached
Pre-656.50% 4.50% 2026
Post-65 medical5.00
 4.50
 2026
Post-65 prescription10.00
 4.50
 2026
An annual increase or decrease in the assumed medical care cost trend rate of 1% would affect the APBO and the service and interest cost components at December 31, 2017 as follows:
 
1 Percent
Increase
 
1 Percent
Decrease
 (in millions)
Benefit obligation$4
 $3
Service and interest costs
 

NOTES (continued)
Gulf Power Company 2017 Annual Report

Pension Plans
The total accumulated benefit obligation for the pension plans was $524 million at December 31, 2017 and $460 million at December 31, 2016. Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$517
 $480
Service cost13
 12
Interest cost19
 19
Benefits paid(20) (17)
Actuarial (gain) loss58
 23
Balance at end of year587
 517
Change in plan assets   
Fair value of plan assets at beginning of year491
 420
Actual return (loss) on plan assets81
 39
Employer contributions1
 49
Benefits paid(20) (17)
Fair value of plan assets at end of year553
 491
Accrued liability$(34) $(26)
At December 31, 2017, the projected benefit obligations for the qualified and non-qualified pension plans were $563 million and $25 million, respectively. All pension plan assets are related to the qualified pension plan.
Amounts recognized on the balance sheets at December 31, 2017 and 2016 related to the Company's pension plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$160
 $153
Other current liabilities(1) (1)
Employee benefit obligations(33) (25)
Presented below are the amounts included in regulatory assets at December 31, 2017 and 2016 related to the defined benefit pension plans that had not yet been recognized in net periodic pension cost along with the estimated amortization of such amounts for 2018.
 2017 2016 Estimated Amortization in 2018
 (in millions)
Prior service cost$2
 $3
 $
Net (gain) loss158
 150
 10
Regulatory assets$160
 $153
  

NOTES (continued)
Gulf Power Company 2017 Annual Report

The changes in the balance of regulatory assets related to the defined benefit pension plans for the years ended December 31, 2017 and 2016 are presented in the following table:

2017 2016

(in millions)
Regulatory assets:

 

Beginning balance$153
 $142
Net (gain) loss15
 16
Change in prior service costs
 2
Reclassification adjustments:
 
Amortization of prior service costs(1) (1)
Amortization of net gain (loss)(7) (6)
Total reclassification adjustments(8) (7)
Total change7
 11
Ending balance$160
 $153
Components of net periodic pension cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$13
 $12
 $12
Interest cost19
 19
 20
Expected return on plan assets(38) (34) (32)
Recognized net (gain) loss7
 6
 9
Net amortization1
 1
 1
Net periodic pension cost$2
 $4
 $10
Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Company has elected to amortize changes in the market value of all plan assets over five years rather than recognize the changes immediately. As a result, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets.
Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2017, estimated benefit payments were as follows:
 
Benefit
Payments
 (in millions)
2018$22
201923
202025
202126
202228
2023 to 2027155

NOTES (continued)
Gulf Power Company 2017 Annual Report

Other Postretirement Benefits
Changes in the APBO and in the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$83
 $81
Service cost1
 1
Interest cost3
 3
Benefits paid(5) (4)
Actuarial (gain) loss1
 2
Balance at end of year83
 83
Change in plan assets   
Fair value of plan assets at beginning of year18
 17
Actual return (loss) on plan assets3
 2
Employer contributions4
 3
Benefits paid(5) (4)
Fair value of plan assets at end of year20
 18
Accrued liability$(63) $(65)
Amounts recognized on the balance sheets at December 31, 2017 and 2016 related to the Company's other postretirement benefit plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$8
 $11
Other current liabilities(1) (1)
Other regulatory liabilities, deferred(2) (4)
Employee benefit obligations(62) (64)
Approximately $6 million and $7 million was included in net regulatory assets at December 31, 2017 and 2016, respectively, related to the net loss for the other postretirement benefit plans that had not yet been recognized in net periodic other postretirement benefit cost. The estimated amortization of such amounts for 2018 is immaterial.
The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2017 and 2016 are presented in the following table:

2017 2016

(in millions)
Net regulatory assets (liabilities):

 

Beginning balance$7
 $5
Net (gain) loss(1) 2
Ending balance$6
 $7

NOTES (continued)
Gulf Power Company 2017 Annual Report

Components of the other postretirement benefit plans' net periodic cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$1
 $1
 $1
Interest cost3
 3
 3
Expected return on plan assets(1) (1) (1)
Net periodic postretirement benefit cost$3
 $3
 $3
Future benefit payments, including prescription drug benefits, reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans. Estimated benefit payments are reduced by drug subsidy receipts expected as a result of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 as follows:
 
Benefit
Payments
 
Subsidy
Receipts
 Total
 (in millions)
2018$5
 $
 $5
20195
 
 5
20205
 
 5
20216
 (1) 5
20226
 (1) 5
2023 to 202728
 (2) 26
Benefit Plan Assets
Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code of 1986, as amended. The Company's investment policies for both the pension plan and the other postretirement benefit plans cover a diversified mix of assets, including equity and fixed income securities, real estate, and private equity. Derivative instruments are used primarily to gain efficient exposure to the various asset classes and as hedging tools. The Company minimizes the risk of large losses primarily through diversification but also monitors and manages other aspects of risk.

NOTES (continued)
Gulf Power Company 2017 Annual Report

The composition of the Company's pension plan and other postretirement benefit plan assets as of December 31, 2017 and 2016, along with the targeted mix of assets for each plan, is presented below:
 Target 2017 2016
Pension plan assets:     
Domestic equity26% 31% 29%
International equity25
 25
 22
Fixed income23
 24
 29
Special situations3
 1
 2
Real estate investments14
 13
 13
Private equity9
 6
 5
Total100% 100% 100%
Other postretirement benefit plan assets:     
Domestic equity25% 30% 28%
International equity24
 24
 21
Domestic fixed income25
 26
 31
Special situations3
 1
 2
Real estate investments14
 13
 13
Private equity9
 6
 5
Total100% 100% 100%
The investment strategy for plan assets related to the Company's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Company employs a formal rebalancing program. As additional risk management, external investment managers and service providersGeorgia are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrationsapproval by environmental regulatory agencies. Absent continued recovery of risk.
Investment Strategies
Detailed below is a description of the investment strategies for each major asset category for the pension and other postretirement benefit plans disclosed above:
Domestic equity. A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.
International equity. A mix of growth stocks and value stocks with both developed and emerging market exposure, managed both actively and through passive index approaches.
Fixed income. A mix of domestic and international bonds.
Special situations. Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies as well as investments in promising new strategies of a longer-term nature.
Real estate investments. Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities.
Private equity. Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.
Benefit Plan Asset Fair Values
Following are the fair value measurements for the pension plan and the other postretirement benefit plan assets as of December 31, 2017 and 2016. The fair values presented are prepared in accordance with GAAP. For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management

NOTES (continued)
Gulf Power Company 2017 Annual Report

relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate.
Valuation methods of the primary fair value measurements disclosed in the following tables are as follows:
Domestic and international equity.Investments in equity securities such as common stocks, American depositary receipts, and real estate investment trusts that trade on a public exchange are classified as Level 1 investments and are valued at the closing price in the active market. Equity investments with unpublished prices (i.e. pooled funds) are valued as Level 2, when the underlying holdings used to value the investment are comprised of Level 1 or Level 2 equity securities.
Fixed income.Investments in fixed income securities are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Real estate investments, private equity, and special situations investments.Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.
The fair values of pension plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$112
 $54
 $
 $
 $166
International equity(*)
72
 65
 
 
 137
Fixed income:         
U.S. Treasury, government, and agency bonds
 39
 
 
 39
Corporate bonds
 57
 
 
 57
Pooled funds
 30
 
 
 30
Cash equivalents and other10
 
 
 
 10
Real estate investments22
 
 
 55
 77
Special situations
 
 
 8
 8
Private equity
 
 
 31
 31
Total$216
 $245
 $
 $94
 $555
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.

NOTES (continued)
Gulf Power Company 2017 Annual Report

 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$93
 $43
 $
 $
 $136
International equity(*)
57
 52
 
 
 109
Fixed income:         
U.S. Treasury, government, and agency bonds
 27
 
 
 27
Mortgage- and asset-backed securities
 1
 
 
 1
Corporate bonds
 47
 
 
 47
Pooled funds
 24
 
 
 24
Cash equivalents and other46
 
 
 
 46
Real estate investments14
 
 
 53
 67
Special situations
 
 
 8
 8
Private equity
 
 
 25
 25
Total$210
 $194
 $
 $86
 $490
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
The fair values of other postretirement benefit plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$4
 $2
 $
 $
 $6
International equity(*)
2
 2
 
 
 4
Fixed income:         
U.S. Treasury, government, and agency bonds
 1
 
 
 1
Corporate bonds
 2
 
 
 2
Pooled funds
 1
 
 
 1
Cash equivalents and other1
 
 
 
 1
Real estate investments1
 
 
 2
 3
Private equity
 
 
 1
 1
Total$8
 $8
 $
 $3
 $19
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.

NOTES (continued)
Gulf Power Company 2017 Annual Report

 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$3
 $2
 $
 $
 $5
International equity(*)
2
 2
 
 
 4
Fixed income:         
U.S. Treasury, government, and agency bonds
 1
 
 
 1
Corporate bonds
 2
 
 
 2
Pooled funds
 1
 
 
 1
Cash equivalents and other2
 
 
 
 2
Real estate investments1
 
 
 2
 3
Private equity
 
 
 1
 1
Total$8
 $8
 $
 $3
 $19
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Employee Savings Plan
The Company also sponsors a 401(k) defined contribution plan covering substantially all employees. The Company matches a portion of the first 6% of employee base salary contributions. The maximum Company match is 5.1% of an employee's base salary. Total matching contributions made to the plan for 2017, 2016, and 2015 were $5 million, $5 million, and $4 million, respectively.
3. CONTINGENCIES AND REGULATORY MATTERS
General Litigation Matters
The Company is subject to certain claims and legal actions arising in the ordinary course of business. In addition, the Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of natural resources has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters. The ultimate outcome of such pending or potential litigation against the Company cannot be predicted at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements.
Environmental Matters
Environmental Remediation
The Company must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Company may also incur substantial costs to clean up affected sites. The Company received authority from the Florida PSC to recover approved environmental complianceARO costs through the environmental cost recovery clause. The Florida PSC reviews costsregulated rates, results of operations, cash flows, and adjusts rates up or down annually.
Thefinancial condition for Southern Company recognizes a liability for environmental remediation costs only when it determines a loss is probable and reasonably estimable. At December 31, 2017 and 2016, the Company's environmental remediation liability included estimated costs of environmental remediation projects of approximately $52 million and $44 million, respectively, of which approximately

NOTES (continued)
Gulf Power Company 2017 Annual Report

$5 million and $4 million, respectively, is included in under recovered regulatory clause revenues and other current liabilities and approximately $47 million and $40 million, respectively, is included in other regulatory assets, deferred and other deferred credits and liabilities. These estimated costs primarily relate to site closure criteria by the Florida Department of Environmental Protection (FDEP) for potential impacts to soil and groundwater from herbicide applications at the Company's substations. The schedule for completion of the remediation projects is subject to FDEP approval. The projects have been approved by the Florida PSC for recovery through the Company's environmental cost recovery clause; therefore, these liabilities have no impact on net income.
The final outcome of these matters cannot be determined at this time. However, the final disposition of these matters is not expected to have a material impact on the Company's financial statements.
FERC Matters
The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies (including the Company) and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' (including the Company's) and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show why market-based rate authority should notcould be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies (including the Company) and Southern Power filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies (including the Company) and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for the traditional electric operating companies' (including the Company's) and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies (including the Company) and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' (including the Company's) and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.
On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' (including the Company's) and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies (including the Company) and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
materially impacted. The ultimate outcome of these matters cannot be determined at this time. See Note 3 under "General Litigation Matters – Alabama Power" for additional information.
Retail Regulatory MattersNuclear Decommissioning
The Company's ratesNRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. Alabama Power and charges for serviceGeorgia Power have external trust funds (Funds) to retail customerscomply with the NRC's regulations. Use of the Funds is restricted to nuclear decommissioning activities. The Funds are subjectmanaged and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and state PSCs, as well as the IRS. While Alabama Power and Georgia Power are allowed to prescribe an overall investment policy to the regulatory oversightFunds' managers, neither Southern Company nor its subsidiaries or affiliates are allowed to engage in the day-to-day management of the Florida PSC. The Company's rates are a combination of base rates and several separate cost recovery clauses for specific categories of costs. These separate cost recovery clauses address such items as fuel and purchased energy costs, purchased power capacity costs, energy conservation and demand sideFunds or to mandate individual investment decisions. Day-to-day management programs, and the costs of compliance with environmental laws and regulations. Costs not addressed through one of the specific cost recovery clausesinvestments in the Funds is delegated to unrelated third-party managers with oversight by the management of Alabama Power and Georgia Power. The Funds' managers are recovered throughauthorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the Company's base rates.return on the Funds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities.
Retail Base Rate Cases
InAlabama Power and Georgia Power record the 2013 Rate Case Settlement Agreement,investment securities held in the Florida PSC authorizedFunds at fair value, as disclosed in Note 13, as management believes that fair value best represents the Company to reduce depreciation and record a regulatory asset up to $62.5 million from January 2014 through June 2017. In any given month, such depreciation reduction was not to exceed the amount necessary for the retail ROE, as reported to the Florida PSC monthly, to reach the midpointnature of the authorized retail ROE range thenFunds. Gains and losses, whether realized or unrealized, are recorded in effect. For 2014the regulatory liability for AROs in the balance sheets and 2015, the Company recognized reductionsare not included in depreciation of $8.4 millionnet income or OCI. Fair value adjustments and realized gains and losses are determined on a specific identification basis.
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Gulf Power Company 2017 Annual Report

Investment securities in the Funds for December 31, 2023 and 2022 were as follows:
Southern CompanyAlabama
Power
Georgia
Power
(in millions)
At December 31, 2023:
Equity securities$1,288 $796 $492 
Debt securities895 277 618 
Other securities239 186 53 
Total investment securities in the Funds$2,422 $1,259 $1,163 
At December 31, 2022:
Equity securities$1,095 $690 $405 
Debt securities838 267 571 
Other securities210 168 42 
Total investment securities in the Funds(*)
$2,143 $1,125 $1,018 
(*)For Southern Company and $20.1Georgia Power, these amounts include investment securities pledged to creditors and collateral received and excludes payables related to a securities lending program Georgia Power's Funds previously participated in through the managers of the Funds. Under this program, Georgia Power's Funds' investment securities were loaned to institutional investors for a fee. Securities loaned were fully collateralized by cash, letters of credit, and/or securities issued or guaranteed by the U.S. government or its agencies or instrumentalities. At December 31, 2022, approximately $35 million respectively. No net reductionof the fair market value of Georgia Power's Funds' securities were on loan and pledged to creditors under the Funds' managers' securities lending program. At December 31, 2022, the fair value of the collateral received was approximately $36 million and could only be sold by the borrower upon the return of the loaned securities. The collateral received was treated as a non-cash item in depreciation wasthe statements of cash flows.
These amounts exclude receivables related to investment income and pending investment sales and payables related to pending investment purchases.
The fair value increases (decreases) of the Funds, including unrealized gains (losses) and reinvested interest and dividends and excluding the Funds' expenses, for 2023, 2022, and 2021 are shown in the table below.
Southern CompanyAlabama
Power
Georgia
Power
(in millions)
Fair value increases (decreases)
2023$281 $157 $124 
2022(360)(171)(189)
2021274 200 74 
Unrealized gains (losses)
At December 31, 2023$241 $119 $122 
At December 31, 2022(391)(204)(187)
At December 31, 2021(27)(30)
The investment securities held in the Funds continue to be managed with a long-term focus. Accordingly, all purchases and sales within the Funds are presented separately in the statements of cash flows as investing cash flows, consistent with the nature of the securities and purpose for which the securities were acquired.
For Alabama Power, approximately $13 million and $14 million at December 31, 2023 and 2022, respectively, previously recorded in 2016. In 2017,internal reserves is being transferred into the Company recognizedFunds through 2040 as approved by the remaining $34.0 million reduction in depreciation.Alabama PSC.
On April 4, 2017, the Florida PSC approved the 2017 Rate Case Settlement Agreement among the Company and three intervenors with respect to the Company's request in 2016 to increase retail base rates. Among the termsThe NRC's minimum external funding requirements are based on a generic estimate of the 2017 Rate Case Settlement Agreement,cost to decommission only the Company increased rates effectiveradioactive portions of a nuclear unit based on the size and type of reactor. Alabama Power and Georgia Power have filed plans with the first billing cycleNRC designed to ensure that, over time, the deposits and earnings of the Funds will provide the minimum funding amounts prescribed by the NRC.
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At December 31, 2023 and 2022, the accumulated provisions for the external decommissioning trust funds were as follows:
20232022
(in millions)
Alabama Power
Plant Farley$1,259 $1,125 
Georgia Power
Plant Hatch$705 $628 
Plant Vogtle Units 1 and 2434 382 
Plant Vogtle Units 3 and 424 
Total$1,163 $1,018 
Site study cost is the estimate to decommission a specific facility as of the site study year. The decommissioning cost estimates are based on removal of the plant from service and prompt dismantlement. The actual decommissioning costs may vary from these estimates because of changes in July 2017the assumed date of decommissioning, changes in NRC requirements, or changes in the assumptions used in making these estimates. The estimated costs of decommissioning at December 31, 2023 based on the most current studies were as follows:
Alabama PowerGeorgia Power
Plant
Farley
Plant
 Hatch(*)
Plant Vogtle
 Units 1 and 2(*)
Plant Vogtle
 Unit 3(*)
Most current study year2023202120212020
Decommissioning periods:
Beginning year2037203420472063
Completion year2087207520792074
(in millions)
Site study costs:
Radiated structures$1,402 $771 $628 $284 
Spent fuel management513 186 170 30 
Non-radiated structures133 61 85 33 
Total site study costs$2,048 $1,018 $883 $347 
(*)Based on Georgia Power's ownership interests.
For ratemaking purposes, Alabama Power's decommissioning costs are based on the site study and Georgia Power's decommissioning costs are based on the NRC generic estimate to providedecommission the radioactive portion of the facilities and the site study estimate for spent fuel management. Significant assumptions used to determine these costs for ratemaking were an annual overall net customer impactestimated inflation rate of approximately $54.3 million. The net customer impact consisted of a $62.0 million increase in annual base revenues, less an annual purchased power capacity cost recovery clause credit4.5% for certain wholesale revenues of approximately $8 million through December 2019. In addition, the Company continued its authorized retail ROE midpoint (10.25%)Plant Farley, 2.5% for Plants Hatch and range (9.25% to 11.25%), is deemed to have a maximum equity ratio of 52.5% for all retail regulatory purposes, and implemented new dismantlement accruals effective July 1, 2017. The Company also began amortizing the regulatory asset associated with the investment balances remaining after the retirement of Plant SmithVogtle Units 1 and 2, (357 MWs)and 2.4% for Plant Vogtle Unit 3 and an estimated trust earnings rate of 7.0% for Plant Farley, 4.5% for Plants Hatch and Vogtle Units 1 and 2, and 4.4% for Plant Vogtle Unit 3.
Amounts previously contributed to the Funds for Plant Farley are currently projected to be adequate to meet the decommissioning obligations. Alabama Power's site-specific estimates of decommissioning costs for Plant Farley are updated every five years. The next site study for Alabama Power is expected to be completed in 2028. Projections of funds are reviewed with the Alabama PSC to ensure that, over 15 years effectivetime, the deposits and earnings of the Funds will provide adequate funding to cover the site-specific costs. If necessary, Alabama Power would seek the Alabama PSC's approval to address any changes in a manner consistent with NRC and other applicable requirements.
Under the 2019 ARP, Georgia Power's annual decommissioning cost for ratemaking in 2021 and 2022 was a total of $4 million for Plant Hatch and Plant Vogtle Units 1 and 2. Effective January 1, 20182023, as approved in the 2022 ARP, there is no annual decommissioning cost for ratemaking for Plant Hatch and implemented new depreciation rates effective JanuaryPlant Vogtle Units 1 2018. and 2. Any funding amount required by the NRC during the period covered by the 2022 ARP will be deferred to a regulatory asset and recovery is expected to be determined in Georgia Power's next base rate case. See Note 2 under "Georgia Power – Rate Plans – 2022 ARP" for additional information. Effective August 1, 2023, as approved under the Plant Vogtle Unit 3 and Common Facilities rate proceeding, Georgia Power's
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annual decommissioning cost for ratemaking is $8 million for Plant Vogtle Unit 3. See Note 2 under "Georgia Power – Nuclear Construction – Regulatory Matters" for additional information.
7. CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS
The 2017 Rate Case Settlement Agreement also resultedRegistrants may hold ownership interests in a $32.5 million write-downnumber of business ventures with varying ownership structures. Partnership interests and other variable interests are evaluated to determine if each entity is a VIE. If a venture is a VIE for which a Registrant is the primary beneficiary, the assets, liabilities, and results of operations of the Company'sentity are consolidated. The Registrants reassess the conclusion as to whether an entity is a VIE upon certain occurrences, which are deemed reconsideration events.
For entities that are not determined to be VIEs, the Registrants evaluate whether they have control or significant influence over the investee to determine the appropriate consolidation and presentation. Generally, entities under the control of a Registrant are consolidated, and entities over which a Registrant can exert significant influence, but which a Registrant does not control, are accounted for under the equity method of accounting.
Investments accounted for under the equity method are recorded within equity investments in unconsolidated subsidiaries in the balance sheets and, for Southern Company and Southern Company Gas, the equity income is recorded within earnings from equity method investments in the statements of income. See "SEGCO" and "Southern Company Gas" herein for additional information.
Southern Company
At December 31, 2023 and 2022, Southern Holdings had equity method investments totaling $126 million and $112 million, respectively, primarily related to investments in venture capital funds focused on energy and utility investments. Earnings from these investments were immaterial for all periods presented.
SEGCO
Alabama Power and Georgia Power own equally all of the outstanding capital stock of SEGCO, which owns electric generating units at Plant Gaston with a total rated capacity of 1,020 MWs, as well as associated transmission facilities. Retirement of SEGCO's generating units is currently expected to occur by December 31, 2028. However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. See Note 2 under "Georgia Power – Integrated Resource Plans" for additional information. Alabama Power and Georgia Power account for SEGCO using the equity method; Southern Company consolidates SEGCO. The capacity of these units is sold equally to Alabama Power and Georgia Power. Alabama Power and Georgia Power make payments sufficient to provide for the operating expenses, taxes, interest expense, and a ROE. The share of purchased power included in purchased power, affiliates in the statements of income totaled $112 million in 2023, $124 million in 2022, and $75 million in 2021 for Alabama Power and $115 million in 2023, $127 million in 2022, and $77 million in 2021 for Georgia Power.
SEGCO paid dividends of $25 million in 2023, $14 million in 2022, and $14 million in 2021, one half of which were paid to each of Alabama Power and Georgia Power. In addition, Alabama Power and Georgia Power each recognize 50% of SEGCO's net income.
Alabama Power, which owns and operates a generating unit adjacent to the SEGCO generating units, has a joint ownership agreement with SEGCO for the ownership of Plant Scherer Unitan associated gas pipeline. Alabama Power owns 14% of the pipeline with the remaining 86% owned by SEGCO.
See Note 3 (205 MWs), which was recorded in the first quarter 2017. The remaining issuesunder "Guarantees" for additional information regarding guarantees of Alabama Power and Georgia Power related to SEGCO.
Southern Power
Variable Interest Entities
Southern Power has certain subsidiaries that are determined to be VIEs. Southern Power is considered the inclusionprimary beneficiary of these VIEs because it controls the most significant activities of the Company's investment in Plant Scherer Unit 3 in retail rates have been resolvedVIEs, including operating and maintaining the respective assets, and has the obligation to absorb expected losses of these VIEs to the extent of its equity interests.
SP Solar and SP Wind
SP Solar is owned by Southern Power and a limited partner. A wholly-owned subsidiary of Southern Power is the general partner and holds a 1% ownership interest, and another wholly-owned subsidiary of Southern Power owns a 66% ownership interest. The limited partner holds the remaining 33% noncontrolling interest. SP Solar qualifies as a resultVIE since the arrangement is structured as a limited partnership and the 33% limited partner does not have substantive kick-out rights against the general partner.
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At December 31, 2023 and 2022, SP Solar had total assets of certain costs associated with the ongoing ownership$5.6 billion and operation$5.9 billion, respectively, total liabilities of the unit through the environmental cost recovery clause.
The 2017 Rate Case Settlement Agreement set forth a process for addressing the revenue requirement effects$0.4 billion, and noncontrolling interests of the Tax Reform Legislation through a prospective change$1.0 billion and $1.1 billion, respectively. Cash distributions from SP Solar are allocated 67% to Southern Power and 33% to the Company's base rates.limited partner in accordance with their partnership interest percentage. Under the terms of the 2017 Rate Case Settlement Agreement,limited partnership agreement, distributions without limited partner consent are limited to available cash and SP Solar is obligated to distribute all such available cash to its partners each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves.
SP Wind is owned by March 1, 2018,Southern Power and three financial investors. A wholly-owned subsidiary of Southern Power owns 100% of the Company must identifyClass B membership interests and the revenue requirements impacts and defer themthree financial investors own 100% of the Class A membership interests. SP Wind qualifies as a VIE since the structure of the arrangement is similar to a regulatory assetlimited partnership and the Class A members do not have substantive kick-out rights against Southern Power.
At December 31, 2023 and 2022, SP Wind had total assets of $2.1 billion and $2.2 billion, respectively, total liabilities of $187 million and $169 million, respectively, and noncontrolling interests of $38 million and $39 million, respectively. Under the terms of the limited liability agreement, distributions without Class A member consent are limited to available cash and SP Wind is obligated to distribute all such available cash to its members each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves. Cash distributions from SP Wind are generally allocated 60% to Southern Power and 40% to the three financial investors in accordance with the limited liability agreement.
Southern Power consolidates both SP Solar and SP Wind, as the primary beneficiary, since it controls the most significant activities of each entity, including operating and maintaining their assets. Certain transfers and sales of the assets in the VIEs are subject to partner consent and the liabilities are non-recourse to the general credit of Southern Power. Liabilities consist of customary working capital items and do not include any long-term debt.
Other Variable Interest Entities
Southern Power has other consolidated VIEs that relate to certain subsidiaries that have either sold noncontrolling interests to tax equity investors or regulatory liabilityacquired less than a 100% interest from facility developers. These entities are considered VIEs because the arrangements are structured similar to be considered for prospective application in a change to base rates in a limited scope proceeding before the Florida PSC. In lieu of this approach, on February 14, 2018, the parties to the 2017 Rate Case Settlement Agreement filed a new stipulation and settlement agreement (2018 Tax Reform Settlement Agreement) with the Florida PSC. If approved, the 2018 Tax Reform Settlement Agreement will result in annual reductions of $18.2 million to the Company's base rates and $15.6 million to the Company's environmental cost recovery rates effective beginning the first calendar month following approval.
The 2018 Tax Reform Settlement Agreement also provides for a one-time refund of $69.4 million for the retail portion of unprotected (not subject to normalization) deferred tax liabilities through the Company's fuel cost recovery rate over the remainder of 2018. In addition, a limited scope proceeding to address the flow back of protected deferred tax liabilities will be initiated by May 1, 2018partnership and the Company will record a regulatory liability fornoncontrolling members do not have substantive kick-out rights.
At December 31, 2023 and 2022, the related 2018 amounts eligible to be returned to customers consistent with IRS normalization principles. Unless otherwise agreed to byother VIEs had total assets of $1.7 billion and $1.8 billion, respectively, total liabilities of $0.2 billion, and noncontrolling interests of $0.8 billion. Under the parties toterms of the 2018 Tax Reform Settlement Agreement, amounts recordedpartnership agreements, distributions of all available cash are required each month or quarter and additional distributions require partner consent.
Equity Method Investments
During 2023 and 2022, Southern Power sold its remaining equity method investments in this regulatory liability will be refunded to retail customers in 2019 throughwind projects and received proceeds totaling $50 million and $38 million, respectively. Earnings (loss) from these investments, including the Company's fuel cost recovery rate.
If the 2018 Tax Reform Settlement Agreement is approved, the 2017 Rate Case Settlement Agreement will be amended to increase the Company's maximum equity ratio from 52.5% to 53.5% for regulatory purposes.
The ultimate outcome of these matters cannot be determined at this time.
Cost Recovery Clauses
As discussed previously, the 2017 Rate Case Settlement Agreement resolved the remaining issues related to the Company's inclusion of certain costsgains associated with the ongoing ownership and operation of Plant Scherer Unit 3 in the environmental cost recovery clause and no adjustment to the environmental cost recovery clause rate approved by the Florida PSC in November 2016 was made.
On October 25, 2017, the Florida PSC approved the Company's annual clause rate request for its fuel, purchased power capacity, environmental, and energy conservation cost recovery factors for 2018. The net effect of the approved changes is a $63 million increase in annual revenues effective in January 2018, the majority of which will be offset by related expense increases.
Revenuessales, were immaterial for all cost recovery clauses, as recorded on the financial statements, are adjusted for differences in actual recoverable costs and amounts billed in current regulated rates. Accordingly, changes in the billing factor for fuel and purchased power will have no significant effect on the Company's revenues or net income, but will affect annual cash flow. The recovery provisions for environmental compliance and energy conservation include related expenses and a return on net average investment.
Retail Fuel Cost Recovery
The Company has established fuel cost recovery rates as approved by the Florida PSC. If, at any time during the year, the projected year-end fuel cost over or under recovery balance exceeds 10% of the projected fuel revenue applicable for the period, the Company is required to notify the Florida PSC and indicate if an adjustment to the fuel cost recovery factor is being requested.periods presented.
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Southern Company Gas
AtEquity Method Investments
The carrying amounts of Southern Company Gas' equity method investments at December 31, 2017,2023 and 2022 and related earnings (loss) from those investments for the under recovered fuel balance was approximately $22 million, which is included in under recovered regulatory clause revenues on the balance sheet. Atyears ended December 31, 2016,2023, 2022, and 2021 were as follows:
Investment BalanceDecember 31, 2023December 31, 2022
(in millions)
SNG$1,202 $1,243 
Other33 33 
Total$1,235 $1,276 
Earnings (Loss) from Equity Method Investments202320222021
(in millions)
SNG$139 $146 $127 
PennEast Pipeline(*)
 — (81)
Other1 
Total$140 $148 $50 
(*)For 2021, includes pre-tax impairment charges totaling $84 million. See "PennEast Pipeline Project" herein for additional information, including the over recovered fuel balance was approximately $15 million, which is included in other regulatory liabilities, current on the balance sheet.
Purchased Power Capacity Recovery
The Company has established purchased power capacity cost recovery rates as approved by the Florida PSC. If the projected year-end purchased power capacity cost over or under recovery balance exceeds 10%September 2021 cancellation of the projected purchased power capacity revenue applicableproject.
PennEast Pipeline Project
In 2014, Southern Company Gas entered into a partnership in which it holds a 20% ownership interest in the PennEast Pipeline, an interstate pipeline company formed to develop and operate an approximate 118-mile natural gas pipeline between New Jersey and Pennsylvania. In 2019, an appellate court ruled that the PennEast Pipeline does not have federal eminent domain authority over lands in which a state has property rights interests. In June 2021, the U.S. Supreme Court ruled in favor of PennEast Pipeline following a review of the appellate court decision. Southern Company Gas assesses its equity method investments for impairment whenever events or changes in circumstances indicate that the period,investment may be impaired. Following the U.S. Supreme Court ruling, during the second quarter 2021, Southern Company is required to notifyGas management reassessed the Florida PSCproject construction timing, including the anticipated timing for receipt of a FERC certificate and indicate ifall remaining state and local permits, as well as potential challenges thereto, and performed an adjustment toimpairment analysis. The outcome of the purchased power capacity cost recovery factor is being requested.
At December 31, 2017,analysis resulted in a pre-tax impairment charge of $82 million ($58 million after tax). In September 2021, PennEast Pipeline announced that further development of the under recovered purchased power capacity balanceproject was $2 million, which is included in under recovered regulatory clause revenues on the balance sheet. At December 31, 2016, the balance was immaterial.
Environmental Cost Recovery
The Florida Legislature adopted legislation for an environmental cost recovery clause, which allows an electric utility to petition the Florida PSC for recovery of prudent environmental compliance costs that are not being recovered through base rates or any other recovery mechanism. Such environmental costs include operationsno longer supported, and, maintenance expenses, emissions allowance expense, depreciation, and a return on net average investment. This legislation also allows recovery of costs incurred as a result, of an agreement between the Company and the FDEP for the purpose of ensuring compliance with ozone ambient air quality standards adopted by the EPA.
Annually, the Company seeks recovery of projected costs including any true-up amounts from prior periods. At December 31, 2017 and 2016, the over recovered environmental balance of approximately $11 million and $8 million, respectively, along with the current portion of projected environmental expenditures, was included in under recovered regulatory clause revenues on the balance sheets.
Energy Conservation Cost Recovery
Every five years, the Florida PSC establishes new numeric conservation goals covering a 10-year period for utilities to reduce annual energy and seasonal peak demand using demand-side management (DSM) programs. After the goals are established, utilities develop plans and programs to meet the approved goals. The costs for these programs are recovered through rates established annually in the energy conservation cost recovery (ECCR) clause.
At December 31, 2017, the under recovered ECCR balance was immaterial. At December 31, 2016, the balance was approximately $4 million, which is included in under recovered regulatory clause revenues on the balance sheet.
Other Matters
As a resultall further development of the costproject ceased. During the third quarter 2021, Southern Company Gas recorded an additional pre-tax charge of $2 million ($2 million after tax) related to comply with environmental regulations imposed by the EPA, the Company retired its coal-fired generation at Plant Smith Units 1 and 2 in March 2016. In August 2016, the Florida PSC approved the Company's request to reclassify the remaining net book value of Plant Smith Units 1 and 2 and the remaining materials and supplies associated with these units asshare of the retirement date, totaling approximately $63project level impairment, as well as $7 million to a regulatory asset. The Company began amortizing the investment balances over 15 years effective January 1, 2018of additional tax expense, resulting in accordance with the 2017 Rate Case Settlement Agreement.
4. JOINT OWNERSHIP AGREEMENTS
The Company and Mississippi Power jointly own Plant Daniel Units 1 and 2, which together represent capacitytotal pre-tax charges of 1,000 MWs. Plant Daniel is a generating plant located in Jackson County, Mississippi. In accordance with the operating agreement, Mississippi Power acts as the Company's agent with respect$84 million ($67 million after tax) during 2021 related to the construction, operation, and maintenance of these units.
The Company and Georgia Power jointly own the 818-MW capacity Plant Scherer Unit 3. Plant Scherer is a generating plant located near Forsyth, Georgia. In accordance with the operating agreement, Georgia Power acts as the Company's agent with respect to the construction, operation, and maintenance of the unit.project.
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8. FINANCING
At December 31, 2017, the Company's percentage ownership and investment in these jointly-owned facilities were as follows:
 
Plant Scherer
Unit 3 (coal)
 Plant Daniel Units 1 & 2 (coal)
 (in millions)
Plant in service$374
  $696
Accumulated depreciation147
  225
Construction work in progress9
  4
Company ownership25%  50%
The Company's proportionate share of its plant operating expenses is included in the corresponding operating expenses in the statements of income and the Company is responsible for providing its own financing.
5. INCOME TAXES
On behalf of the Company, Southern Company files a consolidated federal income tax return and various combined and separate state income tax returns. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.
Federal Tax Reform Legislation
Following the enactment of the Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of the Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See Note 3 under "Retail Regulatory Matters" for additional information.
Current and Deferred Income TaxesLong-term Debt
Details of income tax provisionslong-term debt at December 31, 2023 and 2022 are as follows:provided in the following table:
At December 31, 2023Balance Outstanding at
December 31,
MaturityWeighted Average
Interest Rate
20232022
(in millions)
Southern Company
Senior notes(a)
2024-20734.16%$40,235 $35,683 
Junior subordinated notes2024-20814.33%8,333 8,836 
FFB loans(b)
2024-20442.88%4,788 4,874 
Revenue bonds(c)
2024-20633.77%3,400 2,844 
First mortgage bonds(d)
2025-20633.64%2,500 2,275 
Medium-term notes2026-20277.03%84 84 
Other long-term debt2024-20455.44%234 167 
Finance lease obligations(e)
298 314 
Unamortized fair value adjustment302 330 
Unamortized debt premium (discount), net(198)(193)
Unamortized debt issuance expenses(290)(273)
Total long-term debt59,686 54,941 
Less: Amount due within one year2,476 4,285 
Total long-term debt excluding amount due within one year$57,210 $50,656 
Alabama Power
Senior notes2025-20733.95%$9,875 $9,675 
Revenue bonds(c)
2024-20633.94%1,321 995 
Other long-term debt2026-20307.04%75 45 
Finance lease obligations(e)
Unamortized debt premium (discount), net(20)(18)
Unamortized debt issuance expenses(73)(72)
Total long-term debt11,183 10,630 
Less: Amount due within one year223 301 
Total long-term debt excluding amount due within one year$10,960 $10,329 
Georgia Power
Senior notes2024-20524.34%$9,575 $7,925 
Junior subordinated notes20775.00%270 270 
FFB loans(b)
2024-20442.88%4,788 4,874 
Revenue bonds(c)
2025-20623.64%1,968 1,738 
Finance lease obligations(e)
240 238 
Unamortized debt premium (discount), net(19)(18)
Unamortized debt issuance expenses(122)(117)
Total long-term debt16,700 14,910 
Less: Amount due within one year502 901 
Total long-term debt excluding amount due within one year$16,198 $14,009 
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 2017 2016 2015
 (in millions)
Federal -     
Current$19
 $34
 $(3)
Deferred58
 45
 80
 77
 79
 77
State -     
Current(1) 
 5
Deferred14
 12
 10
 13
 12
 15
Total$90
 $91
 $92

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Gulf Power Company 2017 Annual Report

At December 31, 2023Balance Outstanding at
December 31,
MaturityWeighted Average
Interest Rate
20232022
(in millions)
Mississippi Power
Senior notes2024-20514.27%$1,525 $1,425 
Revenue bonds(c)
2025-20524.08%111 111 
Finance lease obligations(e)
16 17 
Unamortized debt premium (discount), net
Unamortized debt issuance expenses(9)(10)
Total long-term debt1,644 1,545 
Less: Amount due within one year201 
Total long-term debt excluding amount due within one year$1,443 $1,544 
Southern Power
Senior notes(a)
2025-20464.05%$2,728 $2,998 
Unamortized debt premium (discount), net(4)(5)
Unamortized debt issuance expenses(13)(14)
Total long-term debt2,711 2,979 
Less: Amount due within one year— 290 
Total long-term debt excluding amount due within one year$2,711 $2,689 
Southern Company Gas
Senior notes2025-20514.36%$4,930 $4,769 
First mortgage bonds(d)
2025-20633.64%2,500 2,275 
Medium-term notes2026-20277.03%84 84 
Other long-term debt2024-20453.81%59 22 
Unamortized fair value adjustment302 330 
Unamortized debt premium (discount), net(8)(8)
Unamortized debt issuance expenses(34)(30)
Total long-term debt7,833 7,442 
Less: Amount due within one year— 400 
Total long-term debt excluding amount due within one year$7,833 $7,042 
The tax effects(a)Includes a fair value gain (loss) of temporary differences between$(12) million and $(31) million at December 31, 2023 and 2022, respectively, related to Southern Power's foreign currency hedge on its euro-denominated senior notes.
(b)Secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the carrying amounts of assetsunits, the related real property, and liabilitiesany nuclear fuel loaded in the financial statementsreactor core) and their respective tax bases, which give rise(ii) Georgia Power's rights and obligations under the principal contracts relating to deferred tax assetsPlant Vogtle Units 3 and liabilities, are as follows:
 2017 2016
 (in millions)
Deferred tax liabilities-   
Accelerated depreciation$552
 $834
Property basis differences105
 123
Pension and other employee benefits38
 58
Regulatory assets22
 45
Regulatory assets associated with employee benefit obligations44
 65
Regulatory assets associated with asset retirement obligations38
 55
Other13
 12
Total812
 1,192
Deferred tax assets-   
Federal effect of state deferred taxes25
 37
Postretirement benefits17
 26
Pension and other employee benefits49
 72
Property differences98
 1
Regulatory liability associated with Tax Reform Legislation (not subject to normalization)19
 
Property reserve10
 17
Asset retirement obligations38
 55
Alternative minimum tax carryforward7
 18
Other12
 18
Total275
 244
Accumulated deferred income taxes$537
 $948
The implementation of the Tax Reform Legislation significantly reduced accumulated deferred income taxes, partially offset by bonus depreciation provisions in the Protecting Americans from Tax Hikes Act. The Tax Reform Legislation also significantly reduced tax-related regulatory assets and increased tax-related regulatory liabilities.
At December 31, 2017, tax-related regulatory assets to be recovered from customers were $31 million. These assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest.
At December 31, 2017, the tax-related regulatory liabilities to be credited to customers were $458 million. These liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and unamortized ITCs.
Effective Tax Rate
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
 2017 2016 2015
Federal statutory rate35.0% 35.0% 35.0%
State income tax, net of federal deduction3.7 3.4 3.9
Non-deductible book depreciation0.2 0.6 0.5
Differences in prior years' deferred and current tax rates (0.1) (0.1)
AFUDC equity  (1.8)
Other, net0.5 0.6 (0.6)
Effective income tax rate39.4% 39.5% 36.9%

NOTES (continued)
Gulf Power Company 2017 Annual Report

In March 2016, the FASB issued ASU 2016-09, which changed the accounting for income taxes for share-based payment award transactions. Entities are required to recognize all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation as income tax expense or benefit in the income statement. The adoption of ASU 2016-09 did not have a material impact on the Company's overall effective tax rate.4. See Note 1 under "Recently Issued Accounting Standards""DOE Loan Guarantee Borrowings" herein for additional information.
Unrecognized Tax Benefits
The Company has no material unrecognized tax benefits for the periods presented. The Company classifies interest on tax uncertainties as interest expense. Accrued interest for unrecognized tax benefits was immaterial and the Company did not accrue any penalties on uncertain tax positions.
It is reasonably possible that the amount of the unrecognized tax benefits could change within 12 months. The settlement of federal and state audits could impact the balances, but an estimate of the range of reasonably possible outcomes cannot be determined at this time.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2016. Southern Company is a participant in the Compliance Assurance Process of the IRS. The audits for the Company's state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2011.
6. FINANCING
Securities Due Within One Year
At December 31, 2017, the Company had no long-term debt due within one year. At December 31, 2016, the Company had $87 million of long-term debt due within one year.
Maturities through 2022 applicable to total long-term debt include $175 million in 2020 and $141 million in 2022. There are no scheduled maturities in 2018, 2019, or 2021.
Bank Term Loans
At December 31, 2016, the Company had $100 million of bank term loans outstanding. In March 2017, the Company extended the maturity of its $100 million short-term floating rate bank loan bearing interest based on one-month LIBOR from April 2017 to October 2017 and subsequently repaid the loan in May 2017.
Senior Notes
At December 31, 2017 and 2016, the Company had a total of $990 million and $777 million of senior notes outstanding, respectively. These senior notes are effectively subordinate to all secured debt of the Company, which totaled approximately $41 million at both December 31, 2017 and 2016.
In May 2017, the Company issued $300 million aggregate principal amount of Series 2017A 3.30% Senior Notes due May 30, 2027. The proceeds, together with other funds, were used to repay at maturity $85 million aggregate principal amount of Series 2007A 5.90% Senior Notes due June 15, 2017, to repay outstanding commercial paper borrowings, to repay a $100 million short-term floating rate bank loan, and to redeem, in June 2017, all outstanding shares of preference stock. See "Bank Term Loans" and "Outstanding Classes of Capital Stock" herein for more information.
Pollution Control (c)Revenue Bonds
Pollution control revenue bond obligations represent loans to the Companytraditional electric operating companies from public authorities of funds derived from sales by such authorities of revenue bonds issued to finance pollution control and solid waste disposal and wastewater facilities. In some cases, the revenue bond obligations represent obligations under installment sales agreements with respect to facilities constructed with the proceeds of revenue bonds issued by public authorities. The Company istraditional electric operating companies are required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. The amountProceeds from certain issuances are restricted until qualifying expenditures are incurred.
(d)Secured by substantially all of tax-exempt pollution control revenue bond obligations outstanding at December 31, 2017 and 2016 was $309 million.Nicor Gas' properties.
Outstanding Classes of Capital Stock
The Company currently has preferred stock, Class A preferred stock, preference stock, and common stock authorized. The Company's preferred stock and Class A preferred stock, without preference between classes, would rank senior to(e)Secured by the Company's preference stock and common stock with respect to payment of dividends and voluntary or involuntary dissolution. No shares of preferred stock or Class A preferred stock were outstanding at December 31, 2017. The Company's preference stock would rank senior to the common stock with respect to the payment of dividends and voluntary or involuntary dissolution. No shares of preference stock were outstanding at December 31, 2017. In June 2017, the Company redeemed 550,000 shares ($55 millionunderlying lease ROU asset. See Note 9 for additional information.
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Maturities of long-term debt for the next five years are as follows:
aggregate liquidation amount) of 6.00% Series Preference Stock, 450,000 shares ($45
Southern Company(a)
Alabama Power(b)
Georgia
Power(c)
Mississippi Power
Southern Power(d)
Southern Company
Gas
(in millions)
2024$2,480 $223 $503 $201 $— $— 
20254,124 251 849 12 500 300 
20263,791 46 448 66 964 530 
20272,075 551 512 10 — 154 
20282,612 107 864 357 — 150 
(a)See notes (b) and (c) below.
(b)Alabama Power's 2024 maturities include $200 million aggregate liquidation amount)principal amount of Series 2007A 6.45% Preference Stock, and 500,000 shares ($50 million aggregate liquidation amount)2023A Floating Rate Senior Notes due May 15, 2073 that are repayable at the option of Series 2013A 5.60% Preference Stock.
In January 2017, the Company issued 1,750,000 sharesholders at certain dates beginning in 2024. As a result, the senior notes are classified as securities due within one year on the balance sheets of common stock to Southern Company and realized proceedsAlabama Power at December 31, 2023.
(c)Amounts include principal amortization related to the FFB borrowings; however, the final maturity date is February 20, 2044. See "DOE Loan Guarantee Borrowings" herein for additional information.
(d)Southern Power's 2026 maturities include $564 million of $175 million. The proceeds were usedeuro-denominated debt at the U.S. dollar denominated hedge settlement amount.
DOE Loan Guarantee Borrowings
Pursuant to the loan guarantee program established under Title XVII of the Energy Policy Act of 2005 (Title XVII Loan Guarantee Program), Georgia Power and the DOE entered into a loan guarantee agreement in 2014 and the Amended and Restated Loan Guarantee Agreement in 2019. Under the Amended and Restated Loan Guarantee Agreement, the DOE agreed to guarantee the obligations of Georgia Power under the FFB Credit Facilities. Under the FFB Credit Facilities, Georgia Power was authorized to make term loan borrowings through the FFB in an amount up to approximately $5.130 billion, provided that total aggregate borrowings under the FFB Credit Facilities could not exceed 70% of (i) Eligible Project Costs minus (ii) approximately $1.492 billion (reflecting the amounts received by Georgia Power under the Guarantee Settlement Agreement less the related customer refunds).
In 2021, Georgia Power made the final borrowings under the FFB Credit Facilities and no further borrowings are permitted. During 2023, Georgia Power made principal amortization payments of $86 million under the FFB Credit Facilities. At December 31, 2023 and 2022, Georgia Power had $4.8 billion and $4.9 billion of borrowings outstanding under the FFB Credit Facilities, respectively.
All borrowings under the FFB Credit Facilities are full recourse to Georgia Power, and Georgia Power is obligated to reimburse the DOE for general corporate purposes, includingany payments the Company's continuous construction program.
Dividend RestrictionsDOE is required to make to the FFB under its guarantee. Georgia Power's reimbursement obligations to the DOE are full recourse and secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. There are no restrictions on Georgia Power's ability to grant liens on other property.
The Company can only pay dividendsfinal maturity date for each advance under the FFB Credit Facilities is February 20, 2044. Interest is payable quarterly and principal payments began in 2020. Each borrowing under the FFB Credit Facilities bears interest at a fixed rate equal to Southern Company outthe applicable U.S. Treasury rate at the time of retained earnings or paid-in-capital.the borrowing plus a spread equal to 0.375%.
Assets SubjectUnder the Amended and Restated Loan Guarantee Agreement, Georgia Power is subject to Liencustomary borrower affirmative and negative covenants and events of default. In addition, Georgia Power is subject to project-related reporting requirements and other project-specific covenants and events of default.
The Company has granted a lien on its property at Plant Daniel in connection withIn the issuance of two series of pollution control revenue bonds with an aggregateevent certain mandatory prepayment events occur, Georgia Power will be required to prepay the outstanding principal amount of $41 millionall borrowings under the FFB Credit Facilities over a period of five years (with level principal amortization). Among other things, these mandatory prepayment events include (i) the termination of the Vogtle Services Agreement or rejection of the Vogtle Services Agreement in any Westinghouse bankruptcy if Georgia Power does not maintain access to intellectual property rights under the related intellectual property licenses; (ii) termination of the Bechtel Agreement by Bechtel or in connection with a cancellation of Plant Vogtle Units 3 and 4, unless the Vogtle Owners enter into a replacement agreement; (iii) cancellation of Plant Vogtle Unit 4 by the Georgia PSC or by Georgia Power; (iv) failure of the holders of 90% of the ownership interests in Plant Vogtle Units 3 and 4 to vote to continue construction following certain schedule extensions; (v) cost disallowances by the Georgia PSC that could have a material adverse effect on completion of Plant Vogtle Unit 4 or Georgia Power's ability to repay the outstanding borrowings under the FFB Credit Facilities; or (vi) loss of or failure to receive necessary regulatory approvals.
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Under certain circumstances, insurance proceeds and any proceeds from an event of taking must be applied to immediately prepay outstanding borrowings under the FFB Credit Facilities. Georgia Power also may voluntarily prepay outstanding borrowings under the FFB Credit Facilities. Under the FFB Credit Facilities, any prepayment (whether mandatory or optional) will be made with a make-whole premium or discount, as applicable.
In connection with any cancellation of December 31, 2017.Plant Vogtle Unit 4, the DOE may elect to continue construction of Plant Vogtle Unit 4. In such an event, the DOE will have the right to assume Georgia Power's rights and obligations under the principal agreements relating to Plant Vogtle Units 3 and 4 and to acquire all or a portion of Georgia Power's ownership interest in Plant Vogtle Units 3 and 4.
See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
Secured Debt
Each of Southern Company's subsidiaries is organized as a legal entity, separate and apart from Southern Company and its other subsidiaries. There are no agreements or other arrangements among the Southern Company system companies under which the assets of one company have been pledged or otherwise made available to satisfy obligations of Southern Company or any of its other subsidiaries.
As discussed under "Long-term Debt" herein, the Registrants had secured debt outstanding at December 31, 2023 and 2022. Each Registrant's senior notes, junior subordinated notes, revenue bond obligations, bank term loans, credit facility borrowings, and notes payable are effectively subordinated to all secured debt of each respective Registrant.
Equity Units
In May 2022, Southern Company remarketed $862.5 million aggregate principal amount of its Series 2019A Remarketable Junior Subordinated Notes due August 1, 2024 (2019A RSNs) and $862.5 million aggregate principal amount of its Series 2019B Remarketable Junior Subordinated Notes due August 1, 2027 (2019B RSNs), pursuant to the terms of its 2019 Series A Equity Units (Equity Units). In connection with the remarketing, the interest rates on the 2019A RSNs and the 2019B RSNs were reset to 4.475% and 5.113%, respectively, payable on a semi-annual basis. In August 2022, the proceeds were ultimately used to settle the purchase contracts entered into as part of the Equity Units and Southern Company issued approximately 25.2 million shares of common stock and received proceeds of $1.725 billion. At December 31, 2023 and 2022, the 2019A RSNs and the 2019B RSNs are included on Southern Company's consolidated balance sheets in long-term debt or, as applicable, securities due within one year.
Convertible Senior Notes
In February 2023, Southern Company issued $1.5 billion aggregate principal amount of Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes). In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option.
Interest on the Series 2023A Convertible Senior Notes is payable semiannually, which began on June 15, 2023. The Series 2023A Convertible Senior Notes will mature on December 15, 2025, unless earlier converted or repurchased, but are not redeemable at the option of Southern Company. The Series 2023A Convertible Senior Notes are direct, unsecured, and unsubordinated obligations of Southern Company, ranking equally with all of Southern Company's other unsecured and unsubordinated indebtedness from time to time outstanding, and are effectively subordinated to all secured indebtedness of Southern Company.
Holders may convert their Series 2023A Convertible Senior Notes at their option prior to the close of business on the business day preceding September 15, 2025, but only under the following circumstances:
during any calendar quarter (and only during such calendar quarter), if the last reported sale price of Southern Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day as determined by Southern Company;
during the five business day period after any 10 consecutive trading day period (Measurement Period) in which the trading price per $1,000 principal amount of Series 2023A Convertible Senior Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the common stock and the conversion rate on each such trading day; or
upon the occurrence of certain corporate events specified in the indenture governing the Series 2023A Convertible Senior Notes.
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On or after September 15, 2025, a holder may convert all or any portion of its Series 2023A Convertible Senior Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions.
Southern Company will settle conversions of the Series 2023A Convertible Senior Notes by paying cash up to the aggregate principal amount of the Series 2023A Convertible Senior Notes to be converted and paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at Southern Company's election, in respect of the remainder, if any, of Southern Company's conversion obligation in excess of the aggregate principal amount of the Series 2023A Convertible Senior Notes being converted. The Series 2023A Convertible Senior Notes are initially convertible at a rate of 11.8818 shares of common stock per $1,000 principal amount converted, which is approximately equal to $84.16 per share of common stock. The conversion rate will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), Southern Company will, in certain circumstances, increase the conversion rate by a number of additional shares of common stock for conversions in connection with the make-whole fundamental change.
Upon the occurrence of a fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), holders of the Series 2023A Convertible Senior Notes may require Southern Company to purchase all or a portion of their Series 2023A Convertible Senior Notes, in principal amounts equal to $1,000 or an integral multiple thereof, for cash at a price equal to 100% of the principal amount of the Series 2023A Convertible Senior Notes to be purchased plus any accrued and unpaid interest.
Bank Credit Arrangements
At December 31, 2017,2023, committed credit arrangements with banks were as follows:
Expires
Company2024202520262028TotalUnused
Expires within
One Year
(in millions)
Southern Company parent(a)
$150 $— $— $1,850 $2,000 $1,998 $150 
Alabama Power— — 650 700 1,350 1,350 — 
Georgia Power— — — 1,750 1,750 1,726 — 
Mississippi Power— 125 150 — 275 275 — 
Southern Power(a)(b)
— — — 600 600 589 — 
Southern Company Gas(c)
100 — — 1,500 1,600 1,598 100 
SEGCO30 — — — 30 30 30 
Southern Company$280 $125 $800 $6,400 $7,605 $7,566 $280 
Expires     
Executable
Term Loans
 Expires Within One Year
2018 2019 2020 Total Unused 
One
Year
 
Two
Years
 Term Out No Term Out
(in millions) (in millions) (in millions) (in millions)
$30
 $25
 $225
 $280
 $280
 $45
 $
 $20
 $10
(a)Arrangement expiring in 2028 represents a $2.45 billion combined arrangement for Southern Company and Southern Power as borrowers. Pursuant to the combined facility, the allocations between Southern Company and Southern Power may be adjusted.
In November 2017,(b)Does not include Southern Power Company's $75 million and $100 million continuing letter of credit facilities for standby letters of credit, expiring in 2025 and 2026, respectively, of which $8 million and $7 million, respectively, was unused at December 31, 2023. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities.
(c)Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company amended $195Gas Capital, which is the borrower of $800 million of itsthe credit arrangement expiring in 2028. Southern Company Gas' committed credit arrangement expiring in 2028 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangements to extendarrangement expiring in 2028, the maturity dates from 2017allocations between Southern Company Gas Capital and 2018 to 2020.Nicor Gas may be adjusted. Nicor Gas is also the borrower under a $100 million credit arrangement expiring in 2024. See "Structural Considerations" herein for additional information.
Most of theThe bank credit arrangements require payment of commitment fees based on the unused portion of the commitments. Commitment fees average less than 1/4 of 1% for the Company.
Registrants and Nicor Gas. Subject to applicable market conditions, theSouthern Company expectsand its subsidiaries expect to renew or replace itstheir bank credit arrangements as needed, prior to expiration. In connection therewith, theSouthern Company and its subsidiaries may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
MostThese bank credit arrangements, as well as the term loan arrangements of thesethe Registrants, Nicor Gas, and SEGCO, contain covenants that limit debt levels and contain cross-acceleration provisions to other indebtedness (including guarantee obligations) that are restricted only to the indebtedness of the individual company. The cross-acceleration provisions to other indebtedness would trigger an event of default if the applicable borrower defaulted on indebtedness, the payment of which was then
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accelerated. Southern Company's, certain of Mississippi Power's, Southern Company Gas', and Nicor Gas' credit arrangements contain covenants that limit debt levels to 70% of total capitalization, as defined in the agreements, and the other subsidiaries' bank credit arrangements contain covenants that limit the Company's debt levellevels to 65% of total capitalization, as defined in the arrangements.agreements. For purposes of these definitions, debt excludes junior subordinated notes and, in certain arrangements, other hybrid securities. Additionally, for Southern Company and Southern Power, for purposes of these definitions, debt excludes any project debt incurred by certain subsidiaries of Southern Power to the extent such debt is non-recourse to Southern Power and capitalization excludes the capital stock or other equity attributable to such subsidiaries. At December 31, 2017,2023, the Company wasRegistrants, Nicor Gas, and SEGCO were in compliance with theseall such covenants.
Most None of the $280 millionbank credit arrangements contain material adverse change clauses at the time of borrowings.
A portion of the unused credit arrangements with banks is allocated to provide liquidity support to the Company's pollution controlcertain revenue bonds of the traditional electric operating companies and the commercial paper program. The amountprograms of the Registrants, Nicor Gas, and SEGCO. At December 31, 2023, outstanding variable rate pollution controldemand revenue bonds outstanding requiringof the traditional electric operating companies with allocated liquidity support astotaled approximately $1.7 billion (comprised of December 31, 2017 was approximately $82 million.$818 million at Alabama Power, $819 million at Georgia Power, and $69 million at Mississippi Power). In addition, at December 31, 2017, the Company2023, Georgia Power had $75approximately $325 million of fixed rate pollution control revenue bonds outstanding that wereare required to be remarketed within the next 12 months. The variable rate demand revenue bonds and fixed rate revenue bonds required to be remarketed within the next 12 months are classified as long-term debt on the balance sheets as a result of available long-term committed credit.
ForAt both December 31, 2023 and 2022, Southern Power had $106 million of cash collateral posted related to PPA requirements, which is included in other deferred charges and assets on Southern Power's consolidated balance sheets.
Notes Payable
The Registrants, Nicor Gas, and SEGCO make short-term cash needs, the Company borrowsborrowings primarily through a commercial paper programprograms that hashave the liquidity support of the Company's committed bank credit arrangements described above. Theabove under "Bank Credit Arrangements." Southern Power's subsidiaries are not parties or obligors to its commercial paper program. Southern Company may also borrow throughGas maintains commercial paper programs at Southern Company Gas Capital and at Nicor Gas. Nicor Gas' commercial paper program supports working capital needs at Nicor Gas as Nicor Gas is not permitted to make money pool loans to affiliates. All of Southern Company Gas' other subsidiaries benefit from Southern Company Gas Capital's commercial paper program. See "Structural Considerations" herein for additional information.
In addition, Southern Company and certain of its subsidiaries have entered into various other arrangements with banks. bank term loan agreements. Unless otherwise stated, the proceeds of these loans were used to repay existing indebtedness and for general corporate purposes, including working capital and, for the subsidiaries, their continuous construction programs.
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Commercial paper and short-term bank term loans are included in notes payable onin the balance sheets.

NOTES (continued)
Gulf Power Company 2017 Annual Report

Details of short-term borrowings for the applicable Registrants were as follows:
 
Short-term Debt at the
End of the Period
 Amount Outstanding Weighted Average Interest Rate
 (in millions)  
December 31, 2017:   
  Commercial paper$45
 2.0%
December 31, 2016:   
  Commercial paper$168
 1.1%
Short-term bank debt100
 1.5%
Total$268
 1.2%
7. COMMITMENTS
Fuel and Purchased Power Agreements
To supply a portion of the fuel requirements of its generating plants, the Company has entered into various long-term commitments for the procurement and delivery of fossil fuel which are not recognized on the balance sheets. In 2017, 2016, and 2015, the Company incurred fuel expense of $427 million, $432 million, and $445 million, respectively, the majority of which was purchased under long-term commitments. The Company expects that a substantial amount of its future fuel needs will continue to be purchased under long-term commitments.
In addition, the Company has entered into various long-term commitments for the purchase of capacity, energy, and transmission, some of which are accounted for as operating leases. The energy-related costs associated with PPAs are recovered through the fuel cost recovery clause. The capacity and transmission-related costs associated with PPAs are recovered through the purchased power capacity cost recovery clause. Capacity expense under a PPA accounted for as an operating lease was $75 million each year for 2017, 2016, and 2015.
Estimated total minimum long-term commitments at December 31, 2017 were as follows:
 Operating Lease PPA
 (in millions)
2018$79
201979
202079
202179
202279
2023 and thereafter33
Total$428
SCS may enter into various types of wholesale energy and natural gas contracts acting as an agent for the Company and all of the other traditional electric operating companies and Southern Power. Under these agreements, each of the traditional electric operating companies and Southern Power may be jointly and severally liable. Accordingly, Southern Company has entered into keep-well agreements with the Company and each of the other traditional electric operating companies to ensure the Company will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of Southern Power as a contracting party under these agreements.
Operating Leases
In addition to the operating lease PPA discussed above, the Company has entered into operating leases with Southern Linc and other third parties for the use of cellular tower space. These agreements have initial terms ranging from five to 10 years and renewal options of up to five years. The Company also has other operating lease agreements with various terms and expiration dates. Total lease payments were $10 million, $9 million, and $14 million for 2017, 2016, and 2015, respectively. The Company includes any step rents, fixed escalations, and reasonably assured renewal periods in its computation of minimum lease payments.

NOTES (continued)
Gulf Power Company 2017 Annual Report

Estimated total minimum lease payments under these operating leases at December 31, 2017 were as follows:
 Minimum Lease Payments
 
Affiliate Operating Leases(a)
 
Non-Affiliate Operating Leases(b)
 Total
 (in millions)
2018$2
 $7
 $9
20191
 1
 2
20201
 1
 2
20211
 
 1
20221
 
 1
2023 and thereafter4
 1
 5
Total$10
 $10
 $20
(a)Includes operating leases for cellular tower space.
(b)Includes operating leases for barges, facilities, and other equipment.
The Company also has operating lease agreements for railcars, barges, and towboats for the transport of coal. The Company has the option to renew the leases at the end of the lease term. The Company's lease costs, charged to fuel inventory and recovered through the retail fuel cost recovery clause, were $7 million in 2017, $5 million in 2016, and $10 million in 2015. The Company's annual barge and towboat payments for 2018 are expected to be approximately $6 million.
8. STOCK COMPENSATION
Stock-Based Compensation
Stock-based compensation primarily in the form of Southern Company performance share units and restricted stock units may be granted through the Omnibus Incentive Compensation Plan to a large segment of the Company's employees ranging from line management to executives. In 2015 and 2016, stock-based compensation consisted exclusively of performance share units. Beginning in 2017, stock-based compensation granted to employees includes restricted stock units in addition to performance share units. Prior to 2015, stock-based compensation also included stock options. As of December 31, 2017, there were 168 current and former employees participating in the stock option, performance share unit, and restricted stock unit programs.
Performance Share Units
Performance share units granted to employees vest at the end of a three-year performance period. All unvested performance share units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of performance share units granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company issues performance share units with performance goals based on three performance goals to employees. These include performance share units with performance goals based on the total shareholder return (TSR) for Southern Company common stock during the three-year performance period as compared to a group of industry peers, performance share units with performance goals based on Southern Company's cumulative earnings per share (EPS) over the performance period, and performance share units with performance goals based on Southern Company's equity-weighted ROE over the performance period.
In 2015 and 2016, the EPS-based and ROE-based awards each represented 25% of the total target grant date fair value of the performance share unit awards granted. The remaining 50% of the total target grant date fair value consisted of TSR-based awards. Beginning in 2017, the total target grant date fair value of the stock compensation awards granted was comprised 20% each of EPS-based awards and ROE-based awards and 30% each of TSR-based awards and restricted stock units.
The fair value of TSR-based performance share unit awards is determined as of the grant date using a Monte Carlo simulation model to estimate the TSR of Southern Company's common stock among the industry peers over the performance period. The Company recognizes compensation expense on a straight-line basis over the three-year performance period without remeasurement.

NOTES (continued)
Gulf Power Company 2017 Annual Report

The fair values of the EPS-based awards and the ROE-based awards are based on the closing stock price of Southern Company common stock on the date of the grant. Compensation expense for the EPS-based and ROE-based awards is generally recognized ratably over the three-year performance period initially assuming a 100% payout at the end of the performance period. Employees become immediately vested in the TSR-based performance share units, along with the EPS-based and ROE-based awards, upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. The expected payout related to the EPS-based and ROE-based awards is reevaluated annually with expense recognized to date increased or decreased based on the number of shares currently expected to be issued. Unlike the TSR-based awards, the compensation expense ultimately recognized for the EPS-based awards and the ROE-based awards will be based on the actual number of shares issued at the end of the performance period.
For the years ended December 31, 2017, 2016, and 2015, employees of the Company were granted performance share units of 28,423, 57,333, and 48,962, respectively. The weighted average grant-date fair value of TSR-based performance share units granted during 2017, 2016, and 2015, determined using a Monte Carlo simulation model to estimate the TSR of Southern Company's stock among the industry peers over the performance period, was $47.30, $45.18, and $46.38, respectively. The weighted average grant-date fair value of both EPS-based and ROE-based performance share units granted during 2017, 2016, and 2015 was $49.18, $48.83, and $47.75, respectively.
For the years ended December 31, 2017, 2016, and 2015, total compensation cost for performance share units recognized in income and the related tax benefit also recognized in income was immaterial. The compensation cost related to the grant of Southern Company performance share units to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. As of December 31, 2017, total unrecognized compensation cost related to performance share award units was immaterial.
Restricted Stock Units
Beginning in 2017, stock-based compensation granted to employees included restricted stock units in addition to performance share units. One-third of the restricted stock units granted to employees vest each year throughout a three-year service period. All unvested restricted stock units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the vesting period.
The fair value of restricted stock units is based on the closing stock price of Southern Company common stock on the date of the grant. Since one-third of the restricted stock units vest each year throughout a three-year service period, compensation expense for restricted stock unit awards is generally recognized over the corresponding one-, two-, or three-year period. Employees become immediately vested in the restricted stock units upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility.
For the year ended December 31, 2017, employees of the Company were granted 15,736 restricted stock units. The weighted average grant-date fair value of restricted stock units granted during 2017 was $48.88.
For the year ended December 31, 2017, total compensation cost and the related tax benefit for restricted stock units recognized in income was immaterial. As of December 31, 2017, total unrecognized compensation cost related to restricted stock units was immaterial.
Stock Options
In 2015, Southern Company discontinued the granting of stock options. Stock options expire no later than 10 years after the grant date and the latest possible exercise will occur no later than November 2024.
The compensation cost related to the grant of Southern Company stock options to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. Compensation cost and related tax benefits recognized in the Company's financial statements were not material for any year presented. As of December 31, 2017, all compensation cost related to stock option awards has been recognized.
The total intrinsic value of options exercised during the years ended December 31, 2017, 2016, and 2015 was $2 million, $3 million, and $2 million, respectively. No cash proceeds are received by the Company upon the exercise of stock options. The actual tax benefit realized by the Company for the tax deductions from stock option exercises were immaterial for all years presented. Prior to the adoption of ASU 2016-09 in 2016, the excess tax benefits related to the exercise of stock options were recognized in the Company's financial statements with a credit to equity. Upon the adoption of ASU 2016-09, beginning in 2016,

NOTES (continued)
Gulf Power Company 2017 Annual Report

all tax benefits related to the exercise of stock options are recognized in income. As of December 31, 2017, the aggregate intrinsic value for the options outstanding and exercisable was $3 million.
9. FAIR VALUE MEASUREMENTS
Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement.
Level 1 consists of observable market data in an active market for identical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.
Level 3 consists of unobservable market data. The input may reflect the assumptions of the Company of what a market participant would use in pricing an asset or liability. If there is little available market data, then the Company's own assumptions are the best available information.
In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the level in the fair value hierarchy in which the fair value measurement is reported.
As of December 31, 2017, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) Total
 (in millions)
Assets:       
Cash equivalents$21
 $
 $
 $21
Liabilities:       
Energy-related derivatives$
 $21
 $
 $21
As of December 31, 2016, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets 
Significant
Other
Observable
Inputs
 
Significant
Unobservable
Inputs
  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) Total
 (in millions)
Assets:       
Energy-related derivatives$
 $5
 $
 $5
Cash equivalents20
 
 
 20
Total$20
 $5
 $
 $25
Liabilities:       
Energy-related derivatives$
 $29
 $
 $29
Valuation Methodologies
The energy-related derivatives primarily consist of over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter

NOTES (continued)
Gulf Power Company 2017 Annual Report

products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflect the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The interest rate derivatives are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 10 for additional information on how these derivatives are used.
As of December 31, 2017 and 2016, other financial instruments for which the carrying amount did not equal fair value were as follows:
 
Carrying
Amount
 
Fair
Value
 (in millions)
Long-term debt:   
2017$1,285
 $1,334
2016$1,074
 $1,097
The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on the current rates available to the Company.
10. DERIVATIVES
The Company is exposed to market risks, primarily commodity price risk and interest rate risk. To manage the volatility attributable to these exposures, the Company nets its exposures, where possible, to take advantage of natural offsets and may enter into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 9 for additional information. In the statements of cash flows, the cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities.
Energy-Related Derivatives
The Company enters into energy-related derivatives to hedge exposures to electricity, gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the Company has limited exposure to market volatility in energy-related commodity prices. The Company manages fuel-hedging programs, implemented per the guidelines of the Florida PSC, through the use of financial derivative contracts, which is expected to continue to mitigate price volatility. The Florida PSC approved a stipulation and agreement that prospectively imposed a moratorium on the Company's fuel-hedging program in October 2016 through December 31, 2017. In connection with the 2017 Rate Case Settlement Agreement, the Florida PSC extended the moratorium on the Company's fuel-hedging program until January 1, 2021. The moratorium does not have an impact on the recovery of existing hedges entered into under the previously-approved hedging program.
Energy-related derivative contracts are accounted for under one of three methods:
Regulatory Hedges — Energy-related derivative contracts which are designated as regulatory hedges relate primarily to the Company's fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through the fuel cost recovery clause.
Cash Flow Hedges — Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales) are initially deferred in OCI before being recognized in the statements of income in the same period as the hedged transactions are reflected in earnings.
Not Designated — Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred.
Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric industry. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.

NOTES (continued)
Gulf Power Company 2017 Annual Report

At December 31, 2017, the net volume of energy-related derivative contracts for natural gas positions totaled 22 million mmBtu for the Company, with the longest hedge date of 2020 over which it is hedging its exposure to the variability in future cash flows for forecasted transactions.
In addition to the volume discussed above, the Company enters into physical natural gas supply contracts that provide the option to sell back excess gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 3 million mmBtu for the Company.
Interest Rate Derivatives
The Company may also enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or losses is recorded in OCI and is reclassified into earnings at the same time the hedged transactions affect earnings. The derivatives employed as hedging instruments are structured to minimize ineffectiveness, which is recorded directly to earnings.
At December 31, 2017, there were no interest rate derivatives outstanding.
The estimated pre-tax losses related to interest rate derivatives that will be reclassified from accumulated OCI to interest expense for the 12-month period ending December 31, 2018 are immaterial. The Company has deferred gains and losses that are expected to be amortized into earnings through 2026.
Derivative Financial Statement Presentation and Amounts
The Company enters into energy-related and interest rate derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.
At December 31, 2017 and 2016, the fair value of energy-related derivatives was reflected on the balance sheets as follows:
 20172016
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
 (in millions)
Derivatives designated as hedging instruments for regulatory purposes    
Energy-related derivatives:    
Other current assets/Other current liabilities$
$14
$4
$12
Other deferred charges and assets/Other deferred credits and liabilities
7
1
17
Total derivatives designated as hedging instruments for regulatory purposes$
$21
$5
$29
Gross amounts recognized$
$21
$5
$29
Gross amounts offset$
$
$(4)$(4)
Net amounts recognized on the Balance Sheets$
$21
$1
$25
Energy-related derivatives not designated as hedging instruments were immaterial on the balance sheets for 2017 and 2016.

NOTES (continued)
Gulf Power Company 2017 Annual Report

At December 31, 2017 and 2016, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivatives designated as regulatory hedging instruments and deferred were as follows:
 Unrealized Losses Unrealized Gains
Derivative Category
Balance Sheet
Location
2017 2016 
Balance Sheet
Location
2017 2016
  (in millions)  (in millions)
Energy-related derivatives:(*)
Other regulatory assets, current$(14) $(9) Other regulatory liabilities, current$
 $1
 Other regulatory assets, deferred(7) (16) Other regulatory liabilities, deferred
 
Total energy-related derivative gains (losses) $(21) $(25)  $
 $1
(*)The unrealized gains and losses for derivative contracts subject to netting arrangements were presented net on the balance sheets.
For the years ended December 31, 2017, 2016, and 2015, the pre-tax effects of energy-related derivatives and interest rate derivatives designated as cash flow hedging instruments on the statements of income were immaterial and there was no material ineffectiveness recorded in earnings for any period presented.
For the years ended December 31, 2017, 2016, and 2015, the pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income were not material.
Contingent Features
The Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain affiliated companies. At December 31, 2017, the Company had no collateral posted with its derivative counterparties to satisfy these arrangements.
At December 31, 2017, the fair value of derivative liabilities with contingent features was immaterial. However, because of joint and several liability features underlying these derivatives, the maximum potential collateral requirements arising from the credit-risk related contingent features, at a rating below BBB- and /or Baa3, were $12 million, and include certain agreements that could require collateral in the event that one or more Southern Company system power pool participants has a credit rating change to below investment grade.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. If collateral is required, fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty.
The Company is exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Company has also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk. Therefore, the Company does not anticipate a material adverse effect on the financial statements as a result of counterparty nonperformance.

NOTES (continued)
Gulf Power Company 2017 Annual Report

11. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Summarized quarterly financial information for 2017 and 2016 is as follows:
Quarter Ended
Operating
Revenues
 
Operating
Income
 Net Income After Dividends on Preference Stock
 (in millions)
March 2017$350
 $46
 $18
June 2017357
 75
 35
September 2017437
 115
 63
December 2017372
 53
 19
      
March 2016$335
 $65
 $29
June 2016365
 74
 34
September 2016436
 90
 45
December 2016349
 54
 23
The Company's business is influenced by seasonal weather conditions.

SELECTED FINANCIAL AND OPERATING DATA 2013-2017
Gulf Power Company 2017 Annual Report

 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions)$1,516
 $1,485
 $1,483
 $1,590
 $1,440
Net Income After Dividends
on Preference Stock (in millions)
$135
 $131
 $148
 $140
 $124
Cash Dividends
on Common Stock (in millions)
$165
 $120
 $130
 $123
 $115
Return on Average Common Equity (percent)9.22
 9.52
 11.11
 11.02
 10.30
Total Assets (in millions)(a)(b)
$4,797
 $4,822
 $4,920
 $4,697
 $4,321
Gross Property Additions (in millions)$201
 $179
 $247
 $361
 $305
Capitalization (in millions):         
Common stock equity$1,531
 $1,389
 $1,355
 $1,309
 $1,235
Preference stock
 147
 147
 147
 147
Long-term debt(a)
1,285
 987
 1,193
 1,362
 1,150
Total (excluding amounts due within one year)$2,816
 $2,523
 $2,695
 $2,818
 $2,532
Capitalization Ratios (percent):         
Common stock equity54.4
 55.1
 50.3
 46.5
 48.8
Preference stock
 5.8
 5.4
 5.2
 5.8
Long-term debt(a)
45.6
 39.1
 44.3
 48.3
 45.4
Total (excluding amounts due within one year)100.0
 100.0
 100.0
 100.0
 100.0
Customers (year-end):         
Residential404,273
 398,501
 393,149
 388,292
 383,980
Commercial56,700
 56,091
 55,460
 54,892
 54,567
Industrial255
 254
 248
 260
 260
Other578
 569
 614
 603
 582
Total461,806
 455,415
 449,471
 444,047
 439,389
Employees (year-end)1,288
 1,352
 1,391
 1,384
 1,410
(a)A reclassification of debt issuance costs from Total Assets to Long-term debt of $8 million and $8 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(b)A reclassification of deferred tax assets from Total Assets of $3 million and $8 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.


SELECTED FINANCIAL AND OPERATING DATA 2013-2017 (continued)
Gulf Power Company 2017 Annual Report

 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions):         
Residential$720
 $714
 $698
 $700
 $632
Commercial412
 410
 403
 408
 395
Industrial144
 152
 144
 153
 139
Other5
 5
 4
 6
 4
Total retail1,281
 1,281
 1,249
 1,267
 1,170
Wholesale — non-affiliates57
 61
 107
 129
 109
Wholesale — affiliates108
 75
 58
 130
 100
Total revenues from sales of electricity1,446
 1,417
 1,414
 1,526
 1,379
Other revenues70
 68
 69
 64
 61
Total$1,516
 $1,485
 $1,483
 $1,590
 $1,440
Kilowatt-Hour Sales (in millions):         
Residential5,229
 5,358
 5,365
 5,362
 5,089
Commercial3,814
 3,869
 3,898
 3,838
 3,810
Industrial1,740
 1,830
 1,798
 1,849
 1,700
Other26
 25
 25
 26
 21
Total retail10,809
 11,082
 11,086
 11,075
 10,620
Wholesale — non-affiliates749
 751
 1,040
 1,670
 1,163
Wholesale — affiliates3,887
 2,784
 1,906
 3,284
 3,127
Total15,445
 14,617
 14,032
 16,029
 14,910
Average Revenue Per Kilowatt-Hour (cents):         
Residential13.77
 13.33
 13.01
 13.06
 12.43
Commercial10.80
 10.60
 10.34
 10.64
 10.37
Industrial8.28
 8.31
 8.01
 8.28
 8.15
Total retail11.85
 11.56
 11.27
 11.44
 11.02
Wholesale3.56
 3.85
 5.60
 5.23
 4.87
Total sales9.36
 9.69
 10.08
 9.52
 9.25
Residential Average Annual         
Kilowatt-Hour Use Per Customer13,015
 13,515
 13,705
 13,865
 13,301
Residential Average Annual         
Revenue Per Customer$1,792
 $1,801
 $1,783
 $1,811
 $1,653
Plant Nameplate Capacity         
Ratings (year-end) (megawatts)2,278
 2,278
 2,583
 2,663
 2,663
Maximum Peak-Hour Demand (megawatts):         
Winter2,202
 2,033
 2,488
 2,684
 1,729
Summer2,422
 2,503
 2,491
 2,424
 2,356
Annual Load Factor (percent)55.2
 54.7
 54.9
 51.1
 55.9
Plant Availability Fossil-Steam (percent)79.3
 81.0
 88.3
 89.4
 92.8
Source of Energy Supply (percent):         
Coal33.1
 31.0
 33.5
 44.5
 36.4
Gas27.8
 23.2
 25.6
 22.2
 23.0
Purchased power —         
From non-affiliates35.6
 41.1
 30.4
 28.9
 37.0
From affiliates3.5
 4.7
 10.5
 4.4
 3.6
Total100.0
 100.0
 100.0
 100.0
 100.0

MISSISSIPPI POWER COMPANY
FINANCIAL SECTION

MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Mississippi Power Company 2017 Annual Report
The management of Mississippi Power Company (the Company) is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of the Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that the Company's internal control over financial reporting was effective as of December 31, 2017.

/s/ Anthony L. Wilson
Anthony L. Wilson
Chairman, President, and Chief Executive Officer

/s/ Moses H. Feagin
Moses H. Feagin
Vice President, Chief Financial Officer, and Treasurer
February 20, 2018


REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholders and the Board of Directors of Mississippi Power Company
Opinion on the Financial Statements
We have audited the accompanying balance sheets and statements of capitalization of Mississippi Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, the related statements of operations, comprehensive income (loss), common stockholder's equity, and cash flows for each of the three years in the period ended December 31, 2017, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements (pages II-431 to II-477) present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018
We have served as the Company's auditor since 2002.


DEFINITIONS
TermMeaning
2012 MPSC CPCN OrderA detailed order issued by the Mississippi PSC in April 2012 confirming the CPCN originally approved by the Mississippi PSC in 2010 authorizing acquisition, construction, and operation of the Kemper County energy facility
AFUDCAllowance for funds used during construction
Alabama PowerAlabama Power Company
AROAsset retirement obligation
ASCAccounting Standards Codification
ASUAccounting Standards Update
CCRCoal combustion residuals
Clean Air ActClean Air Act Amendments of 1990
CO2
Carbon dioxide
Cooperative EnergyElectric cooperative in Mississippi
CPCNCertificate of public convenience and necessity
CWIPConstruction work in progress
DOEU.S. Department of Energy
ECMEnergy cost management clause
ECOEnvironmental compliance overview
EPAU.S. Environmental Protection Agency
FASBFinancial Accounting Standards Board
FERCFederal Energy Regulatory Commission
GAAPU.S. generally accepted accounting principles
Georgia PowerGeorgia Power Company
Gulf PowerGulf Power Company
IGCCIntegrated coal gasification combined cycle, the technology originally approved for Mississippi Power's Kemper County energy facility (Plant Ratcliffe)
IRSInternal Revenue Service
ITCInvestment tax credit
KWHKilowatt-hour
LIBORLondon Interbank Offered Rate
Mirror CWIPA regulatory liability used by Mississippi Power to record financing costs associated with construction of the Kemper County energy facility, which were subsequently refunded to customers
mmBtuMillion British thermal units
Moody'sMoody's Investors Service, Inc.
MPUSMississippi Public Utilities Staff
MRAMunicipal and Rural Associations
MWMegawatt
NOX
Nitrogen oxide
OCIOther comprehensive income
PEPPerformance evaluation plan
power poolThe operating arrangement whereby the integrated generating resources of the traditional electric operating companies and Southern Power (excluding subsidiaries) are subject to joint commitment and dispatch in order to serve their combined load obligations

DEFINITIONS
(continued)

TermMeaning
PPAPower purchase agreement
PSCPublic Service Commission
ROEReturn on equity
S&PS&P Global Ratings, a division of S&P Global Inc.
scrubberFlue gas desulfurization system
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECU.S. Securities and Exchange Commission
SO2
Sulfur dioxide
Southern CompanyThe Southern Company
Southern Company GasSouthern Company Gas and its subsidiaries
Southern Company systemSouthern Company, the traditional electric operating companies, Southern Power, Southern Company Gas (as of July 1, 2016), Southern Electric Generating Company, Southern Nuclear, SCS, Southern Linc, PowerSecure, Inc. (as of May 9, 2016), and other subsidiaries
Southern LincSouthern Communications Services, Inc.
Southern NuclearSouthern Nuclear Operating Company, Inc.
Southern PowerSouthern Power Company and its subsidiaries
SRRSystem Restoration Rider, a tariff for retail property damage reserve
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
traditional electric operating companiesAlabama Power, Georgia Power, Gulf Power, and Mississippi Power

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Mississippi Power Company 2017 Annual Report
OVERVIEW
Business Activities
Mississippi Power Company (the Company) operates as a vertically integrated utility providing electric service to retail customers within its traditional service territory located within the State of Mississippi and to wholesale customers in the Southeast.
Many factors affect the opportunities, challenges, and risks of the Company's business of providing electric service. These factors include the Company's ability to maintain and grow energy sales and to operate in a constructive regulatory environment that provides timely recovery of prudently-incurred costs. These costs include those related to reliability, fuel, and stringent environmental standards, as well as ongoing capital and operations and maintenance expenditures and restoration following major storms. Appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the Company for the foreseeable future.
The Kemper County energy facility was approved by the Mississippi PSC as an IGCC facility in the 2010 CPCN proceedings, subject to a construction cost cap of $2.88 billion, net of $245 million of grants awarded to the project by the DOE under the Clean Coal Power Initiative Round 2 (Initial DOE Grants) and excluding the cost of the lignite mine and equipment, the cost of the CO2 pipeline facilities, AFUDC, and certain general exceptions (Cost Cap Exceptions). The combined cycle and associated common facilities portions of the Kemper County energy facility were placed in service in August 2014. In December 2015, the Mississippi PSC issued an order (In-Service Asset Rate Order), authorizing rates that provided for the recovery of approximately $126 million annually related to the assets previously placed in service.
On June 21, 2017, the Mississippi PSC stated its intent to issue an order (which occurred on July 6, 2017) directing the Company to pursue a settlement under which the Kemper County energy facility would be operated as a natural gas plant, rather than an IGCC plant, and address all issues associated with the Kemper County energy facility (Kemper Settlement Order). The Kemper Settlement Order established a new docket for the purposes of pursuing a global settlement of the related costs (Kemper Settlement Docket).
On June 28, 2017, the Company notified the Mississippi PSC that it would begin a process to suspend operations and start-up activities on the gasifier portion of the Kemper County energy facility, given the uncertainty as to its future. At the time of project suspension, the total cost estimate for the Kemper County energy facility was approximately $7.38 billion, including approximately $5.95 billion of costs subject to the construction cost cap, and was net of the $137 million in additional grants from the DOE received on April 8, 2016 (Additional DOE Grants). In the aggregate, the Company had incurred charges of $3.07 billion ($1.89 billion after tax) as a result of changes in the cost estimate above the cost cap for the Kemper IGCC through May 31, 2017. Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, the Company recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine.
On February 6, 2018, the Mississippi PSC voted to approve a settlement agreement related to cost recovery for the Kemper County energy facility among the Company, the MPUS, and certain intervenors (Kemper Settlement Agreement). The Kemper Settlement Agreement provides for an annual revenue requirement of approximately $99.3 million for costs related to the Kemper County energy facility, which includes the impact of Tax Reform Legislation. The revenue requirement is based on (i) a fixed ROE for 2018 of 8.6%, excluding any performance adjustment, (ii) a ROE for 2019 calculated in accordance with PEP, excluding the performance adjustment, (iii) for future years, a performance-based ROE calculated pursuant to PEP, and (iv) amortization periods for the related regulatory assets and liabilities of eight years and six years, respectively. The revenue requirement also reflects a disallowance related to a portion of the Company's investment in the Kemper County energy facility requested for inclusion in rate base, which was recorded in the fourth quarter 2017 as an additional charge to income of approximately $78 million ($85 million net of accumulated depreciation of $7 million) pre-tax ($48 million after tax).
Under the Kemper Settlement Agreement, retail customer rates will reflect a reduction of approximately $26.8 million annually and include no recovery for costs associated with the gasifier portion of the Kemper County energy facility in 2018 or at any future date. On February 12, 2018, the Company made the required compliance filing with the Mississippi PSC. The Kemper Settlement Agreement also requires (i) the CPCN for the Kemper County energy facility to be modified to limit it to natural gas combined cycle operation and (ii) the Company to file a reserve margin plan with the Mississippi PSC by August 2018.
During the third and fourth quarters of 2017, the Company recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

the suspension period prior to conclusion of the Kemper Settlement Docket, as well as the charge associated with the Kemper Settlement Agreement. Additional pre-tax cancellation costs, including mine and plant closure and contract termination costs, currently estimated at approximately $50 million to $100 million (excluding salvage), are expected to be incurred in 2018. The Company has begun efforts to dispose of or abandon the mine and gasifier-related assets.
Total pre-tax charges to income related to the Kemper County energy facility were $3.4 billion ($2.4 billion after tax) for the year ended December 31, 2017. In the aggregate, since the Kemper County energy facility project started, the Company has incurred charges of $6.2 billion ($4.1 billion after tax) through December 31, 2017.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges.
For additional information, see FUTURE EARNINGS POTENTIAL – "Kemper County Energy Facility" and "Other Matters" herein.
The Company's financial statement presentation contemplates continuation of the Company as a going concern as a result of Southern Company's anticipated ongoing financial support of the Company. For additional information, see Note 6 to the financial statements under "Going Concern." In June 2017, Southern Company made equity contributions totaling $1.0 billion to the Company. The Company used a portion of the proceeds to (i) prepay $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan; (ii) repay $591 million of the outstanding principal amount of promissory notes to Southern Company; and (iii) repay $10 million of the outstanding principal amount of bank loans.
As of December 31, 2017, the Company's current liabilities exceeded current assets by approximately $911 million primarily due to a $900 million unsecured term loan that matures on March 31, 2018. The Company expects to refinance the unsecured term loan with external security issuances and/or borrowings from financial institutions or Southern Company. To fund the Company's capital needs over the next 12 months, the Company intends to utilize operating cash flows, external security issuances, lines of credit, bank term loans, equity contributions from Southern Company, and, to the extent necessary, loans from Southern Company.
The Company continues to focus on several key performance indicators. In recognition that the Company's long-term financial success is dependent upon how well it satisfies its customers' needs, the Company's retail base rate mechanism, PEP, includes performance indicators that directly tie customer service indicators to the Company's allowed ROE. PEP measures the Company's performance on a 10-point scale as a weighted average of results in three areas: average customer price, as compared to prices of other regional utilities (weighted at 40%); service reliability, measured in percentage of time customers had electric service (40%); and customer satisfaction, measured in a survey of residential customers (20%). The Company also focuses on broader measures of customer satisfaction, plant availability, system reliability, and net income after dividends on preferred stock.
On January 16, 2018, the Mississippi PSC approved the 2018 retail fuel cost recovery factor, effective February 2018 through January 2019, which resulted in a $39 million increase in annual revenues. On February 7, 2018, the Company filed its 2018 PEP forecast, requesting an increase in annual base revenues of $26 million. On February 14, 2018, the Company submitted its 2018 ECO filing, requesting an increase in annual retail revenue of $17 million. The PEP and ECO filings include the effects of Tax Reform Legislation. Rulings from the Mississippi PSC on the PEP and ECO filings are expected in the first half of 2018. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters" herein and Note 3 to the financial statements under "Retail Regulatory Matters – Performance Evaluation Plan" for more information. The ultimate outcome of this matter cannot be determined at this time.
The Company's financial success is directly tied to customer satisfaction. Key elements of ensuring customer satisfaction include outstanding service, high reliability, and competitive prices. Management uses customer satisfaction surveys to evaluate the Company's results and generally targets top-quartile performance.
Notes Payable at December 31, 2023Notes Payable at December 31, 2022
Amount
Outstanding
Weighted Average
Interest Rate
Amount
Outstanding
Weighted Average
Interest Rate
(in millions)(in millions)
Southern Company
Commercial paper$1,794 5.6 %$809 4.7 %
Short-term bank debt520 6.4 %1,800 5.0 %
Total$2,314 5.7 %$2,609 4.9 %
Alabama Power
Commercial paper$40 5.5 %$— — %
Georgia Power
Commercial paper$809 5.6 %$— — %
Short-term bank debt520 6.4 %1,600 5.0 %
Total$1,329 5.9 %$1,600 5.0 %
Southern Power
Commercial paper$138 5.5 %$225 4.7 %
Southern Company Gas
Commercial paper:
Southern Company Gas Capital$23 5.5 %$285 4.8 %
Nicor Gas392 5.5 %283 4.6 %
Short-term bank debt:
Nicor Gas  %200 4.9 %
Total$415 5.5 %$768 4.7 %
See RESULTS OF OPERATIONS"Bank Credit Arrangements" herein for information on the Company's financial performance.bank term loan covenants that limit debt levels and cross-acceleration or cross-default provisions.
Earnings
The Company's net loss after dividends on preferred stock was $2.59 billion in 2017 compared to a $50 million net loss in 2016. The change in 2017 was primarily the result of higher pre-tax charges of $3.36 billion ($2.39 billion after tax) in 2017 compared to pre-tax charges of $428 million ($264 million after tax) in 2016 for estimated losses on the Kemper IGCC.
The Company's net loss after dividends on preferred stock was $50 million in 2016 compared to $8 million in 2015. The change in 2016 was primarily the result of higher pre-tax charges of $428 million ($264 million after tax) in 2016 compared to pre-tax charges of $365 million ($226 million after tax) in 2015 for estimated losses on the Kemper IGCC. The decrease in net income was partially offset by an increase in retail revenues due to the implementation of rates in September 2015 for certain Kemper

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

County energy facility in-service assets, partially offset by a decrease in wholesale revenues. The increase in revenues was partially offset by an increase in interest expense in 2016 compared to 2015 due to the termination of an asset purchase agreement between the Company and Cooperative Energy in 2015 and an increase in operations and maintenance expenses.
See Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
RESULTS OF OPERATIONS
A condensed statement of operations follows:
 Amount 
Increase (Decrease)
from Prior Year
 2017 2017 2016
 (in millions)
Operating revenues$1,187
 $24
 $25
Fuel395
 52
 (100)
Purchased power25
 (9) 22
Other operations and maintenance282
 (30) 38
Depreciation and amortization161
 29
 9
Taxes other than income taxes104
 (5) 15
Estimated loss on Kemper IGCC3,362
 2,934
 63
Total operating expenses4,329
 2,971
 47
Operating loss(3,142) (2,947) (22)
Allowance for equity funds used during construction72
 (52) 14
Interest expense, net of amounts capitalized42
 (32) 67
Other income (expense), net(8) (1) 1
Income taxes (benefit)(532) (428) (32)
Net income (loss)(2,588) (2,540) (42)
Dividends on preferred stock2
 
 
Net loss after dividends on preferred stock$(2,590) $(2,540) $(42)

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Operating Revenues
Operating revenues for 2017 were $1.2 billion, reflecting a $24 million increase from 2016. Details of operating revenues were as follows:
 Amount
 2017 2016
 (in millions)
Retail — prior year$859
 $776
Estimated change resulting from —   
Rates and pricing(7) 96
Sales growth (decline)4
 (4)
Weather(15) 8
Fuel and other cost recovery13
 (17)
Retail — current year854
 859
Wholesale revenues —   
Non-affiliates259
 261
Affiliates56
 26
Total wholesale revenues315
 287
Other operating revenues18
 17
Total operating revenues$1,187
 $1,163
Percent change2.1% 2.2%
Total retail revenues for 2017 decreased $5 million, or 0.6%, compared to 2016 primarily due to a $15 million decrease as a result of milder weather in 2017 and the deferral of $17 million of revenue following the complete amortization of certain regulatory assets related to the Kemper County energy facility in July 2017. These decreases were partially offset by a $10 million net increase related to ECO plan rate changes in the third quarter 2016 and the second quarter 2017 and an increase of $13 million in fuel cost recovery. Total retail revenues for 2016 increased $83 million, or 10.7%, compared to 2015 primarily due to changes in rates and pricing of $96 million, partially offset by a net decrease in fuel and other cost recovery of $17 million.
See Note 3 to the financial statements under "Retail Regulatory Matters – Environmental Compliance Overview" and "Kemper County Energy Facility – Rate Recovery" for additional information. See "Energy Sales" below for a discussion of changes in the volume of energy sold, including changes related to sales and weather.
Electric rates for the Company include provisions to adjust billings for fluctuations in fuel costs, including the energy component of purchased power costs. Under these provisions, fuel revenues generally equal fuel expenses, including the energy component of purchased power costs, and do not affect net income. Recoverable fuel costs include fuel and purchased power expenses reduced by the fuel and emissions portion of wholesale revenues from energy sold to customers outside the Company's service territory. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Fuel Cost Recovery" herein for additional information.
Wholesale revenues from power sales to non-affiliated utilities, including FERC-regulated MRA sales as well as market-based sales, were as follows:
 2017 2016 2015
 (in millions)
Capacity and other$154
 $157
 $158
Energy105
 104
 112
Total non-affiliated$259
 $261
 $270
Wholesale revenues from sales to non-affiliates will vary depending on fuel prices, the market prices of wholesale energy compared to the cost of the Company's and the Southern Company system's generation, demand for energy within the Southern Company system's electric service territory, and the availability of the Southern Company system's generation. Increases and decreases in energy revenues that are driven by fuel prices are accompanied by an increase or decrease in fuel costs and do not

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

have a significant impact on net income. In addition, the Company provides service under long-term contracts with rural electric cooperative associations and municipalities located in southeastern Mississippi under cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 19.3% of the Company's total operating revenues in 2017 and are largely subject to rolling 10-year cancellation notices. Historically, these wholesale customers have acted as a group and any changes in contractual relationships for one customer are likely to be followed by the other wholesale customers.
Short-term opportunity energy sales are also included in sales for resale to non-affiliates. These opportunity sales are made at market-based rates that generally provide a margin above the Company's variable cost to produce the energy.
Wholesale revenues from sales to affiliates will vary depending on demand and the availability and cost of generating resources at each company. These affiliate sales are made in accordance with the Intercompany Interchange Contract (IIC), as approved by the FERC. These transactions do not have a significant impact on earnings since this energy is generally sold at marginal cost.
Wholesale revenues from sales to affiliates increased $30 million, or 115.4%, in 2017 compared to 2016. The increase was primarily due to higher natural gas prices and higher KWH sales due to dispatch of the Company's lower cost generation resources to serve system territorial load. Wholesale revenues from sales to affiliates decreased $50 million, or 65.8%, in 2016 compared to 2015 primarily due to a $50 million decrease in energy revenues of which $4 million was associated with lower fuel prices and $46 million was associated with a decrease in KWH sales as a result of lower cost generation available in the Southern Company system.
Energy Sales
Changes in revenues are influenced heavily by the change in the volume of energy sold from year to year. KWH sales for 2017 and the percent change from the prior year were as follows:
 
Total
KWHs
 
Total KWH
Percent Change
 Weather-Adjusted Percent Change
 2017 2017 2016 2017 2016
 (in millions)        
Residential1,944
 (5.2)% 1.3 % 1.4 % (2.4)%
Commercial2,764
 (2.7) 1.3
 (0.1) (2.2)
Industrial4,841
 (1.3) (1.0) (1.3) (1.6)
Other39
 (1.6) (1.3) (1.6) (1.3)
Total retail9,588
 (2.5) 0.1
 (0.4)% (1.9)%
Wholesale         
Non-affiliated3,672
 (6.3) 1.7
    
Affiliated2,024
 82.7
 (60.5)    
Total wholesale5,696
 14.0
 (24.5)    
Total energy sales15,284
 2.8 % (9.8)%    
Changes in retail energy sales are generally the result of changes in electricity usage by customers, changes in weather, and changes in the number of customers. Retail energy sales decreased 2.5% in 2017 as compared to the prior year. This decrease was primarily the result of milder weather in 2017 as compared to 2016. Weather-adjusted residential KWH sales increased in 2017 primarily due to increased customer usage. Weather-adjusted commercial KWH sales decreased primarily due to decreased customer usage largely offset by customer growth. The decrease in industrial KWH energy sales was primarily due to Hurricane Nate, which impacted several large industrial customers.
Retail energy sales increased 0.1% in 2016 as compared to the prior year. This increase was primarily the result of warmer weather in the third quarter 2016 as compared to the corresponding period in 2015. Weather-adjusted residential and commercial KWH sales decreased primarily due to decreased customer usage partially offset by customer growth. The decrease in industrial KWH energy sales was primarily due to planned and unplanned outages by large industrial customers.
See "Operating Revenues" above for a discussion of significant changes in wholesale revenues to affiliated companies.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for the Company. The mix of fuel sources for generation of electricity is determined primarily by demand, the unit cost of fuel consumed, and the availability of generating units. Additionally, the Company purchases a portion of its electricity needs from the wholesale market.
Details of the Company's generation and purchased power were as follows:
 2017 2016 2015
Total generation (in millions of KWHs)
15,319
 14,514
 17,014
Total purchased power (in millions of KWHs)
1,314
 1,574
 539
Sources of generation (percent) –
     
Gas92
 91
 83
Coal8
 9
 17
Cost of fuel, generated (in cents per net KWH) –
     
Gas2.69
 2.41
 2.58
Coal3.64
 3.91
 3.71
Average cost of fuel, generated (in cents per net KWH)
2.77
 2.55
 2.78
Average cost of purchased power (in cents per net KWH)
3.50
 3.07
 2.17
Fuel and purchased power expenses were $420 million in 2017, an increase of $43 million, or 11.4%, as compared to the prior year. The increase was primarily due to a $36 million increase in the average cost of generation and purchased power and a net increase of $7 million in KWHs generated from gas generation.
Fuel and purchased power expenses were $377 million in 2016, a decrease of $78 million, or 17.1%, as compared to the prior year. The decrease was primarily due to a decrease of $70 million in the volume of KWHs generated and purchased and an $8 million increase in the average cost of generation and purchased power.
Fuel and purchased power energy transactions do not have a significant impact on earnings, since energy expenses are generally offset by energy revenues through the Company's fuel cost recovery clauses. See FUTURE EARNINGS POTENTIAL – "Retail Regulatory Matters – Fuel Cost Recovery" herein and Note 1 to the financial statements under "Fuel Costs" for additional information.
Fuel
Fuel expense increased $52 million, or 15.2%, in 2017 compared to 2016 primarily due to an 11.6% higher cost of natural gas. Fuel expense decreased $100 million, or 22.6%, in 2016 compared to 2015 due to an 8.2% decrease in the average cost of fuel per KWH generated and a 15.5% decrease in the volume of KWHs generated.
Purchased Power
Purchased power expense decreased $9 million, or 26.5%, in 2017 compared to 2016. The decrease was primarily the result of a 16.5% decrease in the volume of KWHs purchased offset by a slight increase in the average cost per KWH purchased compared to 2016. Purchased power expense increased $22 million, or 183.3%, in 2016 compared to 2015. The increase in 2016 was primarily the result of a 192.1% increase in the volume of KWHs purchased due to the availability of lower cost energy as compared to the cost of self-generation.
Energy purchases will vary depending on the market prices of wholesale energy as compared to the cost of the Southern Company system's generation, demand for energy within the Southern Company system's service territory, and the availability of the Southern Company system's generation. These purchases are made in accordance with the IIC or other contractual agreements, as approved by the FERC.
Other Operations and Maintenance Expenses
Other operations and maintenance expenses decreased $30 million, or 9.6%, in 2017 compared to the prior year. The decrease was primarily due to a $10 million decrease in transmission and distribution expenses related to overhead line maintenance, an $8 million decrease in contractor services related to facilities, corporate advertising, and employee compensation and benefits, and an $8 million decrease related to the combined cycle and the associated common facilities portion of the Kemper County energy facility.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Other operations and maintenance expenses increased $38 million, or 13.9%, in 2016 compared to the prior year. The increase was primarily due to increases of $28 million related to the combined cycle and associated common facilities portion of the Kemper County energy facility and $10 million in amortization of prior expense deferrals, both following the In-Service Asset Rate Order in December 2015, as well as a $7 million increase in transmission and distribution expenses primarily related to overhead line maintenance and vegetation management expenses, partially offset by a $9 million decrease in planned generation outage costs.
Depreciation and Amortization
Depreciation and amortization increased $29 million, or 22.0%, in 2017 compared to 2016 primarily due to $13 million of amortization related to the ECO plan, $7 million of depreciation for additional plant in service, and $6 million in additional regulatory asset amortization associated with the Mercury and Air Toxics Standards (MATS) rule compliance.
Depreciation and amortization increased $9 million, or 7.3%, in 2016 compared to 2015 primarily due to $32 million of additional regulatory asset amortization related to the In-Service Asset Rate Order, ECO plan, and MATS rule compliance, $13 million associated with Kemper County energy facility deferrals primarily related to depreciation deferrals in 2015, and $9 million of depreciation for additional plant in service assets primarily associated with the Plant Daniel scrubbers. These increases were partially offset by $23 million of regulatory deferrals related to the In-Service Asset Rate Order and a $22 million deferral associated with the implementation of revised ECO plan rates with the first billing cycle for September 2016.
See Note 1 to the financial statements under "Depreciation and Amortization" and Note 3 to the financial statements under "FERC Matters" and "Retail Regulatory Matters – Environmental Compliance Overview Plan" for additional information.
Taxes Other Than Income Taxes
Taxes other than income taxes decreased $5 million, or 4.6%, in 2017 compared to 2016 primarily due to a decrease in franchise taxes of $4 million, as well as a decrease in ad valorem taxes of $1 million. Taxes other than income taxes increased $15 million, or 16.0%, in 2016 compared to 2015 primarily due to increases in ad valorem taxes of $10 million, related to an increase in the assessed value of property, as well as increases in franchise taxes of $5 million, related to increased operating revenue.
The retail portion of ad valorem taxes is recoverable under the Company's ad valorem tax cost recovery clause and, therefore, does not affect net income.
Estimated Loss on Kemper IGCC
In 2017, 2016, and 2015, estimated probable losses on the Kemper IGCC of $3.36 billion, $428 million, and $365 million, respectively, were recorded. On June 28, 2017, the Company suspended the gasifier portion of the project and recorded a charge to earnings for the remaining $2.8 billion book value of the gasifier portion of the project. Prior to the suspension, the Company recorded losses for revisions of estimated costs expected to be incurred on construction of the Kemper IGCC in excess of the $2.88 billion cost cap established by the Mississippi PSC, net of $245 million of the Initial DOE Grants and excluding the Cost Cap Exceptions.
See Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
Allowance for Equity Funds Used During Construction
AFUDC equity decreased $52 million, or 41.9%, in 2017 as compared to 2016 as a result of the Kemper IGCC project suspension in June 2017. AFUDC equity increased $14 million, or 12.7%, in 2016 as compared to 2015 primarily due to a higher AFUDC rate and an increase in Kemper County energy facility CWIP subject to AFUDC prior to the suspension of the gasifier portion of the project, partially offset by placing the Plant Daniel scrubbers in service in November 2015. See ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Allowance for Funds Used During Construction" herein and Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
Interest Expense, Net of Amounts Capitalized
Interest expense, net of amounts capitalized decreased $32 million in 2017 compared to 2016. The decrease was primarily associated with a $36 million net reduction in interest following a settlement with the IRS related to research and experimental (R&E) deductions. Also contributing to the decrease was the amortization of $6 million in interest deferrals in accordance with the In-Service Asset Rate Order and a $7 million decrease in interest related to outstanding debt as a result of lower balances and lower rates. These decreases were partially offset by a $20 million reduction in interest capitalized following suspension of the Kemper County energy facility construction.
See Note 5 to the financial statements under "Section 174 Research and Experimental Deduction" for additional information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Interest expense, net of amounts capitalized increased $67 million in 2016 compared to 2015. The increase was primarily due to an increase of $31 million of interest on deposits resulting from the 2015 reversal of interest associated with the termination of an asset purchase agreement between the Company and Cooperative Energy in May 2015; a $20 million increase due to additional long-term debt and a $30 million decrease in amounts capitalized primarily resulting from $17 million of capitalized interest and the amortization of $13 million in interest deferrals in accordance with the In-Service Asset Rate Order. These net increases were partially offset by a decrease of $16 million in interest accrued on the Mirror CWIP liability prior to refund in 2015.
Income Taxes (Benefit)
Income tax benefits increased $428 million, or 411.5%, in 2017 compared to 2016 primarily due to $809 million in tax benefits on the estimated probable losses on the Kemper IGCC, net of the non-deductible AFUDC equity portion and the related state valuation allowances, partially offset by $372 million resulting from Tax Reform Legislation. Tax Reform Legislation earnings impacts are primarily due to revaluing deferred tax assets related to the Kemper County energy facility. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Note 5 to the financial statements for additional information.
Income tax benefits increased $32 million, or 44.4%, in 2016 compared to 2015 primarily as a result of an increase in the estimated probable losses on the Kemper IGCC and an increase in AFUDC equity, which is non-taxable.
Effects of Inflation
The Company is subject to rate regulation that is generally based on the recovery of historical and projected costs. The effects of inflation can create an economic loss since the recovery of costs could be in dollars that have less purchasing power. Any adverse effect of inflation on the Company's results of operations has not been substantial in recent years.
FUTURE EARNINGS POTENTIAL
General
The Company operates as a vertically integrated utility providing electric service to retail customers within its traditional service territory located in southeast Mississippi and to wholesale customers in the Southeast. Prices for electricity provided by the Company to retail customers are set by the Mississippi PSC under cost-based regulatory principles. Retail rates and earnings are reviewed and may be adjusted periodically within certain limitations. Prices for wholesale electricity sales, interconnecting transmission lines, and the exchange of electric power are regulated by the FERC. See "FERC Matters" herein, ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates – Utility Regulation" herein, and Note 3 to the financial statements for additional information about regulatory matters.
The results of operations for the past three years are not necessarily indicative of future earnings potential. The level of the Company's future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Company's business of providing electric service. These factors include the Company's ability to recover its prudently-incurred costs, in a timely manner during a time of increasing costs, and its ability to prevail against legal challenges associated with the Kemper County energy facility. Future earnings will be driven primarily by customer growth. Earnings will also depend upon maintaining and growing sales, considering, among other things, the adoption and/or penetration rates of increasingly energy-efficient technologies and increasing volumes of electronic commerce transactions, both of which could contribute to a net reduction in customer usage. Earnings are subject to a variety of other factors. These factors include weather, competition, developing new and maintaining existing energy contracts and associated load requirements with other utilities and other wholesale customers, energy conservation practiced by customers, the use of alternative energy sources by customers, the price of electricity, the price elasticity of demand, and the rate of economic growth or decline in the Company's service territory. Demand for electricity is primarily driven by the pace of economic growth that may be affected by changes in regional and global economic conditions, which may impact future earnings.
The Company's retail base rates are set under the PEP, a rate plan approved by the Mississippi PSC. Two filings are made for each calendar year: the PEP projected filing, which is typically filed prior to the beginning of the year based on a projected revenue requirement, and the PEP lookback filing, which is filed after the end of the year and allows for review of the actual return compared to the allowed return range. See "Retail Regulatory Matters" herein and Note 3 to the financial statements under "Retail Regulatory Matters – Performance Evaluation Plan" for more information.
On October 4, 2017, the Company executed agreements with its largest retail customer, Chevron Products Company (Chevron), to continue providing retail service to the Chevron refinery in Pascagoula, Mississippi through 2038, subject to the approval of the Mississippi PSC. The new agreements are not expected to have a material impact on the Company's earnings; however, the co-generation assets located at the refinery are expected to be accounted for as a sales-type lease in accordance with the new lease accounting rules that become effective in 2019. These assets are also subject to a security interest granted to Chevron. See

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein for additional information. The ultimate outcome of this matter cannot be determined at this time.
On December 22, 2017, Tax Reform Legislation was signed into law and became effective on January 1, 2018, which among other things, reduces the federal corporate income tax rate to 21% and changes rates of depreciation and the business interest deduction. See "Income Tax MattersFederal Tax Reform Legislation" and FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Notes 3 and 5 to the financial statements for additional information.
The Company provides service under long-term contracts with rural electric cooperative associations and municipalities located in southeastern Mississippi under cost-based electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 19.3% of the Company's total operating revenues in 2017 and are largely subject to rolling 10-year cancellation notices. Historically, these wholesale customers have acted as a group and any changes in contractual relationships for one customer are likely to be followed by the other wholesale customers.
Environmental Matters
The Company's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, and protection of other natural resources. The Company maintains a comprehensive environmental compliance strategy to assess upcoming requirements and compliance costs associated with these environmental laws and regulations. The costs, including capital expenditures and operations and maintenance costs, required to comply with environmental laws and regulations may impact future unit retirement and replacement decisions, results of operations, cash flows, and financial condition. Compliance costs may result from the installation of additional environmental controls, closure and monitoring of CCR facilities, unit retirements, and adding or changing fuel sources for certain existing units, as well as related upgrades to the transmission system. A major portion of these compliance costs are expected to be recovered through existing ratemaking provisions. The ultimate impact of the environmental laws and regulations discussed below will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, and the outcome of pending and/or future legal challenges.
New or revised environmental laws and regulations could affect many areas of the Company's operations. The impact of any such changes cannot be determined at this time. Environmental compliance costs could affect earnings if such costs cannot continue to be fully recovered in rates on a timely basis or through long-term wholesale agreements. Further, increased costs that are recovered through regulated rates could contribute to reduced demand for electricity, which could negatively affect results of operations, cash flows, and financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affect their demand for electricity. See Note 3 to the financial statements under "Retail Regulatory Matters – Environmental Compliance Overview Plan" for additional information.
Through 2017, the Company has invested approximately $643 million in environmental capital retrofit projects to comply with environmental requirements, with annual totals of approximately $9 million, $17 million, and $94 million for 2017, 2016, and 2015, respectively. Although the timing, requirements, and estimated costs could change as environmental laws and regulations are adopted or modified, as compliance plans are revised or updated, and as legal challenges to rules are initiated or completed, the Company's current compliance strategy estimates capital expenditures of $63 million from 2018 through 2022, with annual totals of approximately $14 million, $16 million, $17 million, $13 million, and $3 million for 2018, 2019, 2020, 2021, and 2022, respectively. These estimates do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See "Global Climate Issues" herein for additional information. The Company also anticipates expenditures associated with ash pond closure and ground water monitoring under the Disposal of Coal Combustion Residuals from Electric Utilities rule (CCR Rule), which are reflected in the Company's ARO liabilities. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
Environmental Laws and Regulations
Air Quality
The EPA has set National Ambient Air Quality Standards (NAAQS) for six air pollutants (carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and SO2), which it reviews and revises periodically. Revisions to these standards can require additional emission controls, improvements in control efficiency, or fuel changes which can result in increased compliance and operational costs. NAAQS requirements can also adversely affect the siting of new facilities. In 2015, the EPA published a more stringent eight-hour ozone NAAQS. The EPA plans to complete designations for this rule by no later than April 30, 2018. No areas within the Company's service territory have been or are anticipated to be designated nonattainment under the 2015 ozone

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

NAAQS. In 2010, the EPA revised the NAAQS for SO2, establishing a new one-hour standard, and is completing designations in multiple phases. The EPA has issued several rounds of area designations and no areas in the vicinity of Company-owned SO2 sources have been designated nonattainment under the 2010 one-hour SO2 NAAQS. However, final eight-hour ozone and SO2 one-hour designations for certain areas are still pending and, if other areas are designated as nonattainment in the future, increased compliance costs could result.
In 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) and its NOX annual, NOX seasonal, and SO2 annual programs. CSAPR is an emissions trading program that addresses the impacts of the interstate transport of SO2 and NOX emissions from fossil fuel-fired power plants located in upwind states in the eastern half of the U.S. on air quality in downwind states. The Company has fossil fuel-fired generation subject to these requirements. In October 2016, the EPA published a final rule that revised the CSAPR seasonal NOX program, establishing more stringent NOX emissions budgets in Alabama and Mississippi. The outcome of ongoing CSAPR litigation, to which the Company is a party, could have an impact on the State of Mississippi's allowance allocations under the CSAPR seasonal NOX program. Increases in either future fossil fuel-fired generation or the cost of CSAPR allowances could have a negative financial impact on results of operations for the Company.
The EPA finalized regional haze regulations in 2005 and 2017. These regulations require states, tribal governments, and various federal agencies to develop and implement plans to reduce pollutants that impair visibility and demonstrate reasonable progress toward the goal of restoring natural visibility conditions in certain areas, including national parks and wilderness areas. States must submit a revised state implementation plan (SIP) to the EPA by July 31, 2021, demonstrating reasonable progress towards achieving visibility improvement goals. State implementation of reasonable progress could require further reductions in SO2 or NOX emissions, which could result in increased compliance costs.
In 2015, the EPA published a final rule requiring certain states (including Alabama and Mississippi) to revise or remove the provisions of their SIPs regulating excess emissions at industrial facilities, including electric generating facilities, during periods of startup, shut-down, or malfunction (SSM). The state excess emission rules provide necessary operational flexibility to affected units during periods of SSM and, if removed, could affect unit availability and result in increased operations and maintenance costs for the Company. The EPA has not yet responded to the SIP revisions proposed by states where the Company's generating units are located.
Water Quality
In 2014, the EPA finalized requirements under Section 316(b) of the Clean Water Act (CWA) to regulate cooling water intake structures at existing power plants and manufacturing facilities in order to minimize their effects on fish and other aquatic life. The regulation requires plant-specific studies to determine applicable measures to protect organisms that either get caught on the intake screens (impingement) or are drawn into the cooling system (entrainment). The ultimate impact of this rule will depend on the outcome of these plant-specific studies and any additional protective measures required to be incorporated into each plant's National Pollutant Discharge Elimination System (NPDES) permit based on site-specific factors.
In 2015, the EPA finalized the steam electric effluent limitations guidelines (ELG) rule that set national standards for wastewater discharges from steam electric generating units. The rule prohibits effluent discharges of certain wastestreams and imposes stringent arsenic, mercury, selenium, and nitrate/nitrite limits on scrubber wastewater discharges. The revised technology-based limits and compliance dates may require extensive modifications to existing ash and wastewater management systems or the installation and operation of new ash and wastewater management systems. Compliance with the ELG rule is expected to require capital expenditures and increased operational costs primarily affecting the Company's coal-fired electric generation. Compliance applicability dates range from November 1, 2018 to December 31, 2023 with state environmental agencies incorporating specific applicability dates in the NPDES permitting process based on information provided for each waste stream. The EPA has committed to a new rulemaking that could potentially revise the limitations and applicability dates of the ELG rule. The EPA expects to finalize this rulemaking in 2020.
In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) jointly published a final rule that revised the regulatory definition of waters of the United States (WOTUS) for all CWA programs. The rule significantly expanded the scope of federal jurisdiction over waterbodies (such as rivers, streams, and canals), which could impact new generation projects and permitting and reporting requirements associated with the installation, expansion, and maintenance of transmission and distribution projects. On July 27, 2017, the EPA and the Corps proposed to rescind the 2015 WOTUS rule. The WOTUS rule has been stayed by the U.S. Court of Appeals for the Sixth Circuit since late 2015, but on January 22, 2018, the U.S. Supreme Court determined that federal district courts have jurisdiction over the pending challenges to the rule. On February 6, 2018, the EPA and the Corps published a final rule delaying implementation of the 2015 WOTUS rule to 2020.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Coal Combustion Residuals
In 2015, the EPA finalized non-hazardous solid waste regulations for the disposal of CCR, including coal ash and gypsum, in landfills and surface impoundments (CCR units) at active generating power plants. The CCR Rule requires CCR units to be evaluated against a set of performance criteria and potentially closed if minimum criteria are not met. Closure of existing CCR units could require installation of equipment and infrastructure to manage CCR in accordance with the rule. The EPA has announced plans to reconsider certain portions of the CCR Rule by no later than December 2019, which could result in changes to deadlines and corrective action requirements.
The EPA's reconsideration of the CCR Rule is due in part to a legislative development that impacts the potential oversight role of state agencies. Under the Water Infrastructure Improvements for the Nation Act, which became law in 2016, states are allowed to establish permit programs for implementing the CCR Rule.
Based on cost estimates for closure and monitoring of ash ponds pursuant to the CCR Rule, the Company recorded AROs for each CCR unit in 2015. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary. In December 2016, the Mississippi PSC granted a CPCN to the Company authorizing certain projects associated with complying with the CCR Rule. Additionally in this order, the Mississippi PSC also authorized the Company to recover any costs associated with the CPCN, including future monitoring costs, through the ECO clause. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information regarding the Company's AROs as of December 31, 2017.
Environmental Remediation
The Company must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Company may also incur substantial costs to clean up affected sites. The Company has authority from the Mississippi PSC to recover approved environmental compliance costs through established regulatory mechanisms. The Company recognizes a liability for environmental remediation costs only when it determines a loss is probable and reasonably estimable.
Global Climate Issues
In 2015, the EPA published final rules limiting CO2 emissions from new, modified, and reconstructed fossil fuel-fired electric generating units and guidelines for states to develop plans to meet EPA-mandated CO2 emission performance standards for existing units (known as the Clean Power Plan or CPP). In February 2016, the U.S. Supreme Court granted a stay of the CPP, which will remain in effect through the resolution of litigation in the U.S. Court of Appeals for the District of Columbia challenging the legality of the CPP and any review by the U.S. Supreme Court. On March 28, 2017, the U.S. President signed an executive order directing agencies to review actions that potentially burden the development or use of domestically produced energy resources, including review of the CPP and other CO2 emissions rules. On October 10, 2017, the EPA published a proposed rule to repeal the CPP and, on December 28, 2017, published an advanced notice of proposed rulemaking regarding a CPP replacement rule.
In 2015, parties to the United Nations Framework Convention on Climate Change, including the United States, adopted the Paris Agreement, which established a non-binding universal framework for addressing greenhouse gas (GHG) emissions based on nationally determined contributions. On June 1, 2017, the U.S. President announced that the United States would withdraw from the Paris Agreement and begin renegotiating its terms. The ultimate impact of this agreement or any renegotiated agreement depends on its implementation by participating countries.
The EPA's GHG reporting rule requires annual reporting of GHG emissions expressed in terms of metric tons of CO2 equivalent emissions for a company's operational control of facilities. Based on ownership or financial control of facilities, the Company's 2016 GHG emissions were approximately 7 million metric tons of CO2 equivalent. The preliminary estimate of the Company's 2017 GHG emissions on the same basis is approximately 8 million metric tons of CO2 equivalent.
FERC Matters
Municipal and Rural Associations Tariff
The Company provides wholesale electric service to Cooperative Energy, East Mississippi Electric Power Association, and the City of Collins, all located in southeastern Mississippi, under a long-term cost-based, FERC regulated MRA tariff.
In March 2016, the Company reached a settlement agreement with its wholesale customers, which was subsequently approved by the FERC, for an increase in wholesale base revenues under the MRA cost-based electric tariff, primarily as a result of placing

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

scrubbers for Plant Daniel Units 1 and 2 in service in 2015. The settlement agreement became effective for services rendered beginning May 1, 2016, resulting in an estimated annual revenue increase of $7 million under the MRA cost-based electric tariff. Additionally, under the settlement agreement, the tariff customers agreed to similar regulatory treatment for MRA tariff ratemaking as the treatment approved for retail ratemaking under the In-Service Asset Rate Order. This regulatory treatment primarily includes (i) recovery of the operational Kemper County energy facility assets providing service to customers and other related costs, (ii) amortization of the Kemper County energy facility-related regulatory assets included in rates under the settlement agreement over the 36 months ending April 30, 2019, (iii) Kemper County energy facility-related expenses included in rates under the settlement agreement no longer being deferred and charged to expense, and (iv) removing all of the Kemper County energy facility CWIP from rate base with a corresponding increase in accrual of AFUDC. The additional resulting AFUDC totaled approximately $22 million through the suspension of Kemper IGCC start-up activities and has been recorded as a charge to income.
The Company expects to make a subsequent MRA filing during the second quarter 2018. The filing is intended to be consistent with the February 6, 2018 Mississippi PSC order for cost recovery of the Kemper County energy facility, including the impact of Tax Reform Legislation. The ultimate outcome of this matter cannot be determined at this time.
On September 18, 2017, the Company and Cooperative Energy executed a Shared Service Agreement (SSA), as part of the MRA tariff, under which the Company and Cooperative Energy will share in providing electricity to all Cooperative Energy delivery points, in lieu of the current arrangement under which each delivery point is specifically assigned to either entity. The SSA accepted by the FERC on October 31, 2017 became effective on January 1, 2018 and may be cancelled by Cooperative Energy with 10 years notice after December 31, 2020. The SSA provides Cooperative Energy the option to decrease its use of the Company's generation services under the MRA tariff, subject to annual and cumulative caps and a one-year notice requirement. In the event Cooperative Energy elects to reduce these services, the related reduction in the Company's revenues is not expected to be significant through 2020.
Fuel Cost Recovery
The Company has a wholesale MRA and a Market Based (MB) fuel cost recovery factor. Effective with the first billing cycle for September 2016, fuel rates decreased $11 million annually for wholesale MRA customers and $1 million annually for wholesale MB customers. Effective January 1, 2018, the wholesale MRA fuel rate increased $11 million annually. At December 31, 2017, over-recovered wholesale MRA fuel costs were immaterial and at December 31, 2016 were approximately $13 million, which is included in over-recovered regulatory clause liabilities, current in the balance sheets.
The Company's operating revenues are adjusted for differences in actual recoverable fuel cost and amounts billed in accordance with the currently approved cost recovery rate. Accordingly, changes in the billing factor should have no significant effect on the Company's revenues or net income, but will affect cash flow.
Market-Based Rate Authority
The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies (including the Company) and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' (including the Company's) and Southern Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies (including the Company) and Southern Power filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies (including the Company) and Southern Power filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for the traditional electric operating companies' (including the Company's) and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies (including the Company) and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' (including the Company's) and Southern Power's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' (including the Company's) and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies (including the Company) and Southern Power responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
The ultimate outcome of these matters cannot be determined at this time.
Cooperative Energy Power Supply Agreement
In 2008, the Company entered into a 10-year Power Supply Agreement (PSA) with Cooperative Energy for approximately 152 MWs, which became effective in 2011. Following certain plant retirements, the PSA capacity was reduced to 86 MWs. On February 5, 2018, the Company and Cooperative Energy executed an amendment to extend the PSA through March 31, 2021, effective April 1, 2018, with increased total capacity of 286 MWs.
Cooperative Energy also has a 10-year Network Integration Transmission Service Agreement (NITSA) with SCS for transmission service to certain delivery points on the Company's transmission system that became effective in 2011. As a result of the PSA amendments, Cooperative Energy and SCS amended the terms of the NITSA on January 12, 2018 to provide for the purchase of incremental transmission capacity for service beginning April 1, 2018 through March 31, 2021. This NITSA amendment remains subject to acceptance by the FERC. The ultimate outcome of these matters cannot be determined at this time.
Retail Regulatory Matters
General
The Company's rates and charges for service to retail customers are subject to the regulatory oversight of the Mississippi PSC. The Company's rates are a combination of base rates and several separate cost recovery clauses for specific categories of costs. These separate cost recovery clauses address such items as fuel and purchased power, energy efficiency programs, ad valorem taxes, property damage, and the costs of compliance with environmental laws and regulations. Costs not addressed through one of the specific cost recovery clauses are expected to be recovered through the Company's base rates. See Note 3 to the financial statements under "Retail Regulatory Matters" and "Kemper County Energy Facility" for additional information.
In 2012, the Mississippi PSC issued an order for the purpose of investigating and reviewing, for informational purposes only, the ROE formulas used by the Company and all other regulated electric utilities in Mississippi. In 2013, the MPUS filed with the Mississippi PSC its report on the ROE formulas used by the Company and all other regulated electric utilities in Mississippi.
In 2014, the Mississippi PSC issued an order for the purpose of investigating and reviewing the adoption of a uniform formula rate plan for the Company and other regulated electric utilities in Mississippi.
On January 26, 2018, the Mississippi PSC issued an order directing utilities to file within 30 days information regarding the impact on rates resulting from Tax Reform Legislation. The Company's Kemper County energy facility rates, approved on February 6, 2018, include the effects of Tax Reform Legislation. The Company's 2018 ECO, revised 2018 PEP, and 2018 SRR rate filings, all submitted in February 2018, include the effects of Tax Reform Legislation and are subject to approval by the Mississippi PSC.
The ultimate outcome of these matters cannot be determined at this time.
Performance Evaluation Plan
The Company's retail base rates are set under the PEP, a rate plan approved by the Mississippi PSC. Two filings are made for each calendar year: the PEP projected filing, which is typically filed prior to the beginning of the year based on a projected revenue requirement, and the PEP lookback filing, which is filed after the end of the year and allows for review of the actual revenue requirement compared to the projected filing.
In 2011, the Company submitted its annual PEP lookback filing for 2010, which recommended no surcharge or refund. Later in 2011, the MPUS disputed certain items in the 2010 PEP lookback filing. In 2012, the Mississippi PSC issued an order canceling the Company's PEP lookback filing for 2011. In 2013, the MPUS contested the Company's PEP lookback filing for 2012, which indicated a refund due to customers of $5 million. Unresolved matters related to the 2010 PEP lookback filing, which remain under review, also impact the 2012 PEP lookback filing.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

In 2013, the Mississippi PSC approved the projected PEP filing for 2013, which resulted in a rate increase of 1.9%, or $15 million, annually, effective March 19, 2013. The Company may be entitled to $3 million in additional revenues related to 2013 as a result of the late implementation of the 2013 PEP rate increase.
In 2014, 2015, 2016, and 2017, the Company submitted its annual PEP lookback filings for the prior years, which for 2013 and 2014 each indicated no surcharge or refund and for each of 2015 and 2016 indicated a $5 million surcharge. Additionally, in July 2016, in November 2016, and on November 15, 2017, the Company submitted its annual projected PEP filings for 2016, 2017, and 2018, respectively, which for 2016 and 2017 indicated no change in rates and for 2018 indicated a rate increase of 4%, or $38 million in annual revenues. The Mississippi PSC suspended each of these filings to allow more time for review.
On February 7, 2018, the Company revised its annual projected PEP filing for 2018 to reflect the impacts of Tax Reform Legislation. The revised filing requests an increase of $26 million in annual revenues, based on a performance adjusted ROE of 9.33% and an increased equity ratio of 55%. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Note 5 to the financial statements for additional information.
The ultimate outcome of these matters cannot be determined at this time.
Energy Efficiency
In 2013, the Mississippi PSC approved an energy efficiency and conservation rule requiring electric and gas utilities in Mississippi serving more than 25,000 customers to implement energy efficiency programs and standards. Quick Start Plans, which include a portfolio of energy efficiency programs that are intended to provide benefits to a majority of customers, were extended by an order issued by the Mississippi PSC in July 2016, until the time the Mississippi PSC approves a comprehensive portfolio plan program. The ultimate outcome of this matter cannot be determined at this time.
On July 6, 2017, the Mississippi PSC issued an order approving the Company's Energy Efficiency Cost Rider 2017 compliance filing, which increased annual retail revenues by approximately $2 million effective with the first billing cycle for August 2017.
On November 30, 2017, the Company submitted its Energy Efficiency Cost Rider 2018 compliance filing, which included a small decrease in annual retail revenues. The ultimate outcome of this matter cannot be determined at this time.
See Note 3 to the financial statements under "Retail Regulatory Matters" for additional information.
Environmental Compliance Overview Plan
In 2012, the Mississippi PSC approved the Company's request for a CPCN to construct scrubbers on Plant Daniel Units 1 and 2, which were placed in service in 2015. These units are jointly owned by the Company and Gulf Power, with 50% ownership each. In 2014, the Company entered into a settlement agreement with the Sierra Club under which, among other things, the Company agreed to retire, repower with natural gas, or convert to an alternative non-fossil fuel source Plant Sweatt Units 1 and 2 (80 MWs) no later than December 2018 (and the units were retired in July 2016). The Company also agreed that it would cease burning coal and other solid fuel at Plant Watson Units 4 and 5 (750 MWs) and begin operating those units solely on natural gas no later than April 2015 (which occurred in April 2015) and cease burning coal and other solid fuel at Plant Greene County Units 1 and 2 (200 MWs) no later than April 2016 (which occurred in February and March 2016, respectively) and begin operating those units solely on natural gas (which occurred in June and July 2016, respectively).
In accordance with a 2011 accounting order from the Mississippi PSC, the Company has the authority to defer in a regulatory asset for future recovery all plant retirement- or partial retirement-related costs resulting from environmental regulations. The Mississippi PSC approved $41 million and $17 million of costs that were reclassified to regulatory assets associated with Plant Watson and Plant Greene County, respectively, for amortization over five-year periods that began in July 2016 and July 2017, respectively. As a result, these decisions are not expected to have a material impact on the Company's financial statements.
In August 2016, the Mississippi PSC approved the Company's revised ECO plan filing for 2016, which requested the maximum 2% annual increase in revenues, or approximately $18 million, primarily related to the Plant Daniel Units 1 and 2 scrubbers placed in service in 2015. The revised rates became effective with the first billing cycle for September 2016. Approximately $22 million of related revenue requirements in excess of the 2% maximum was deferred for inclusion in the 2017 filing, along with related carrying costs.
On May 4, 2017, the Mississippi PSC approved the Company's ECO plan filing for 2017, which requested the maximum 2% annual increase in revenues, or approximately $18 million, primarily related to the carryforward from the prior year. The rates became effective with the first billing cycle for June 2017. Approximately $26 million of related revenue requirements in excess of the 2% maximum was deferred for inclusion in the 2018 filing, along with related carrying costs.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

On February 14, 2018, the Company submitted its ECO plan filing for 2018, including the effects of Tax Reform Legislation, which requested the maximum 2% annual increase in revenues, or approximately $17 million, primarily related to the carryforward from the prior year. Approximately $13 million of related revenue requirements in excess of the 2% maximum, along with related carrying costs, remains deferred for inclusion in the 2019 filing. The ultimate outcome of this matter cannot be determined at this time.
Fuel Cost Recovery
The Company establishes, annually, a retail fuel cost recovery factor that is approved by the Mississippi PSC. The Company is required to file for an adjustment to the retail fuel cost recovery factor annually. On January 12, 2017, the Mississippi PSC approved the 2017 retail fuel cost recovery factor, effective February 2017 through January 2018, which resulted in an annual revenue increase of approximately $55 million. On November 15, 2017, the Company filed its annual rate adjustment under the retail fuel cost recovery clause, requesting an additional increase of $39 million annually, which the Mississippi PSC approved on January 16, 2018 effective February 2018 through January 2019. At December 31, 2017, the amount of under-recovered retail fuel costs included in the balance sheet in customer accounts receivable was approximately $6 million compared to $37 million over recovered at December 31, 2016.
The Company's operating revenues are adjusted for differences in actual recoverable fuel cost and amounts billed in accordance with the currently approved cost recovery rate. Accordingly, changes in the billing factor should have no significant effect on the Company's revenues or net income, but will affect cash flow.
Ad Valorem Tax Adjustment
The Company establishes, annually, an ad valorem tax adjustment factor that is approved by the Mississippi PSC to collect the ad valorem taxes paid by the Company. On July 6, 2017, the Mississippi PSC approved the Company's annual ad valorem tax adjustment factor filing for 2017, which included an annual rate increase of 0.85%, or $8 million in annual retail revenues, primarily due to increased assessments.
System Restoration Rider
In February 2016, the Company submitted its 2016 SRR rate filing which proposed no changes to either the SRR rate or the annual property damage reserve accrual of $3 million annually. On February 3, 2017, the Company submitted its 2017 SRR rate filing, which proposed an increase in the property damage reserve accrual of $1 million. These filings were suspended by the Mississippi PSC for review.
On January 21, 2017, a tornado caused extensive damage to the Company's transmission and distribution infrastructure. Storm damage repairs were approximately $9 million. A portion of these costs was charged to the retail property damage reserve and was addressed in the 2018 SRR rate filing.
On February 1, 2018, the Company submitted its 2018 SRR rate filing, including the effects of Tax Reform Legislation, which proposed that the SRR rate remain at zero and the annual accrual for the property damage reserve be reduced to $2 million in 2018.
The ultimate outcome of these matters cannot be determined at this time. See Note 1 to the financial statements under "Provision for Property Damage" for additional information.
Storm Damage Cost Recovery
In connection with the damage associated with Hurricane Katrina, the Mississippi PSC authorized the issuance of system restoration bonds in 2006. In accordance with a Mississippi PSC order on January 24, 2017, the Company eliminated the applicable Storm Restoration Charge because the bond sinking fund managed by the Mississippi State Bond Commission is substantially funded.
Kemper County Energy Facility
Overview
The Kemper County energy facility was designed to utilize IGCC technology with an expected output capacity of 582 MWs and to be fueled by locally mined lignite (an abundant, lower heating value coal) from a mine owned by the Company and situated adjacent to the Kemper County energy facility. The mine, operated by North American Coal Corporation, started commercial operation in 2013. In connection with the Kemper County energy facility construction, the Company constructed approximately 61 miles of CO2 pipeline infrastructure for the transport of captured CO2 for use in enhanced oil recovery.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Schedule and Cost Estimate
In 2012, the Mississippi PSC issued the 2012 MPSC CPCN Order, confirming the CPCN originally approved by the Mississippi PSC in 2010 authorizing the acquisition, construction, and operation of the Kemper County energy facility. The certificated cost estimate of the Kemper County energy facility included in the 2012 MPSC CPCN Order was $2.4 billion, net of approximately $0.57 billion in Cost Cap Exceptions. The 2012 MPSC CPCN Order approved a construction cost cap of up to $2.88 billion, with recovery of prudently-incurred costs subject to approval by the Mississippi PSC. The Kemper County energy facility was originally projected to be placed in service in May 2014. The Company placed the combined cycle and the associated common facilities portion of the Kemper County energy facility in service in August 2014.
The initial production of syngas began on July 14, 2016 for gasifier "B" and on September 13, 2016 for gasifier "A." The Company achieved integrated operation of both gasifiers on January 29, 2017, including the production of electricity from syngas in both combustion turbines. During testing, the plant produced and captured CO2, and produced sulfuric acid and ammonia, each of acceptable quality under the related off-take agreements. However, the Company experienced numerous challenges during the extended start-up process to achieve integrated operation of the gasifiers on a sustained basis. In May 2017, after achieving these milestones, the Company determined that a critical system component, the syngas coolers, would need replacement sooner than originally planned, which would require significant lead time and significant cost. In addition, the long-term natural gas price forecast had decreased significantly and the estimated cost of operating and maintaining the facility during the first five full years of operations had increased significantly since certification.
On June 21, 2017, the Mississippi PSC stated its intent to issue an order (which occurred on July 6, 2017) directing the Company to pursue a settlement under which the Kemper County energy facility would be operated as a natural gas plant, rather than an IGCC plant, and address all issues associated with the Kemper County energy facility. On June 28, 2017, the Company notified the Mississippi PSC that it would begin a process to suspend operations and start-up activities on the gasifier portion of the Kemper County energy facility, given the uncertainty as to its future.
At the time of project suspension in June 2017, the total cost estimate for the Kemper County energy facility was approximately $7.38 billion, including approximately $5.95 billion of costs subject to the construction cost cap, and was net of the $137 million in Additional DOE Grants. In the aggregate, the Company had recorded charges to income of $3.07 billion ($1.89 billion after tax) as a result of changes in the cost estimate above the cost cap for the Kemper IGCC through May 31, 2017.
Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, the Company recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine. During the third and fourth quarters of 2017, the Company recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during the suspension period prior to conclusion of the Kemper Settlement Docket, as well as the charge associated with the Kemper Settlement Agreement discussed below. Additional pre-tax cancellation costs, including mine and plant closure and contract termination costs, currently estimated at approximately $50 million to $100 million (excluding salvage), are expected to be incurred in 2018. The Company has begun efforts to dispose of or abandon the mine and gasifier-related assets.
Rate Recovery
Kemper Settlement Agreement
On February 6, 2018, the Mississippi PSC voted to approve the Kemper Settlement Agreement. The Kemper Settlement Agreement provides for an annual revenue requirement of approximately $99.3 million for costs related to the Kemper County energy facility, which includes the impact of Tax Reform Legislation. The revenue requirement is based on (i) a fixed ROE for 2018 of 8.6% excluding any performance adjustment, (ii) a ROE for 2019 calculated in accordance with PEP, excluding the performance adjustment, (iii) for future years, a performance-based ROE calculated pursuant to PEP, and (iv) amortization periods for the related regulatory assets and liabilities of eight years and six years, respectively. The revenue requirement also reflects a disallowance related to a portion of the Company's investment in the Kemper County energy facility requested for inclusion in rate base, which was recorded in the fourth quarter 2017 as an additional charge to income of approximately $78 million ($85 million net of accumulated depreciation of $7 million) pre-tax ($48 million after tax).
Under the Kemper Settlement Agreement, retail customer rates will reflect a reduction of approximately $26.8 million annually and include no recovery for costs associated with the gasifier portion of the Kemper County energy facility in 2018 or at any future date. On February 12, 2018, the Company made the required compliance filing with the Mississippi PSC. The Kemper

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Settlement Agreement also requires (i) the CPCN for the Kemper County energy facility to be modified to limit it to natural gas combined cycle operation and (ii) the Company to file a reserve margin plan with the Mississippi PSC by August 2018.
As of December 31, 2017, the balances associated with the Kemper County energy facility regulatory assets and liabilities were $114 million and $26 million, respectively.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges.
2015 Rate Case
On December 3, 2015, the Mississippi PSC issued the In-Service Asset Rate Order regarding the Kemper County energy facility assets that were commercially operational and currently providing service to customers (the transmission facilities, combined cycle, natural gas pipeline, and water pipeline) and other related costs. The In-Service Asset Rate Order provided for retail rate recovery of an annual revenue requirement of approximately $126 million, based on the Company's actual average capital structure, with a maximum common equity percentage of 49.733%, a 9.225% return on common equity, and actual embedded interest costs. The In-Service Asset Rate Order also included a prudence finding of all costs in the stipulated revenue requirement calculation for the in-service assets.
In connection with the implementation of the In-Service Asset Rate Order and wholesale rates, the Company began expensing certain ongoing project costs and certain retail debt carrying costs that previously were deferred and began amortizing certain regulatory assets associated with assets placed in service and consulting and legal fees over periods ranging from two years to 10 years. On July 6, 2017, the Mississippi PSC issued an order requiring the Company to establish a regulatory liability account to maintain current rates related to the Kemper County energy facility following the July 2017 completion of the amortization period for certain of these regulatory assets. See "FERC Matters" herein for additional information related to the 2016 settlement agreement with wholesale customers.
Lignite Mine and CO2 Pipeline Facilities
The Company owns the lignite mine and equipment and mineral reserves located around the Kemper County energy facility site. The mine started commercial operation in June 2013.
In 2010, the Company executed a 40-year management fee contract with Liberty Fuels Company, LLC (Liberty Fuels), a wholly-owned subsidiary of The North American Coal Corporation, which developed, constructed, and is responsible for the mining operations through the end of the mine reclamation. As the mining permit holder, Liberty Fuels has a legal obligation to perform mine reclamation and the Company has a contractual obligation to fund all reclamation activities. The Company expects mine reclamation to begin in 2018. In addition to the obligation to fund the reclamation activities, the Company provided working capital support to Liberty Fuels through cash advances for capital purchases, payroll, and other operating expenses. See Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" and "Variable Interest Entities" for additional information.
In addition, the Company constructed the CO2 pipeline for the planned transport of captured CO2 for use in enhanced oil recovery and entered into an agreement with Denbury Onshore (Denbury) to purchase the captured CO2. Denbury has the right to terminate the contract at any time because the Company did not place the Kemper IGCC in service by July 1, 2017.
The ultimate outcome of these matters cannot be determined at this time.
Litigation
On April 26, 2016, a complaint against the Company was filed in Harrison County Circuit Court (Circuit Court) by Biloxi Freezing & Processing Inc., Gulfside Casino Partnership, and John Carlton Dean, which was amended and refiled on July 11, 2016 to include, among other things, Southern Company as a defendant. The individual plaintiff alleges that the Company and Southern Company violated the Mississippi Unfair Trade Practices Act. All plaintiffs have alleged that the Company and Southern Company concealed, falsely represented, and failed to fully disclose important facts concerning the cost and schedule of the Kemper County energy facility and that these alleged breaches have unjustly enriched the Company and Southern Company. The plaintiffs seek unspecified actual damages and punitive damages; ask the Circuit Court to appoint a receiver to oversee, operate, manage, and otherwise control all affairs relating to the Kemper County energy facility; ask the Circuit Court to revoke any licenses or certificates authorizing the Company or Southern Company to engage in any business related to the Kemper County energy facility in Mississippi; and seek attorney's fees, costs, and interest. The plaintiffs also seek an injunction to prevent any Kemper County energy facility costs from being charged to customers through electric rates. On June 23, 2017, the Circuit Court ruled in favor of motions by Southern Company and the Company and dismissed the case. On July 7, 2017, the plaintiffs filed notice of an appeal. The Company believes this legal challenge has no merit; however, an adverse outcome in this proceeding

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

could have a material impact on the Company's results of operations, financial condition, and liquidity. The Company intends to vigorously defend itself in this matter and the ultimate outcome of this matter cannot be determined at this time.
On June 9, 2016, Treetop, Greenleaf CO2 Solutions, LLC (Greenleaf), Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC, and Tellus Operating Group filed a complaint against the Company, Southern Company, and SCS in the state court in Gwinnett County, Georgia. The complaint related to the cancelled CO2 contract with Treetop and alleged fraudulent misrepresentation, fraudulent concealment, civil conspiracy, and breach of contract on the part of the Company, Southern Company, and SCS and sought compensatory damages of $100 million, as well as unspecified punitive damages. Southern Company, the Company, and SCS moved to compel arbitration pursuant to the terms of the CO2 contract, which the court granted on May 4, 2017. On June 28, 2017, Treetop, Greenleaf, Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC, and Tellus Operating Group filed a claim for arbitration requesting $500 million in damages. On December 28, 2017, the Company reached a settlement agreement with Treetop, Greenleaf, Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC, and Tellus Operating Group and the arbitration was dismissed.
See Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
Income Tax Matters
Federal Tax Reform Legislation
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation, among other things, reduces the federal corporate income tax rate to 21%, retains normalization provisions for public utility property and existing renewable energy incentives, and repeals the corporate alternative minimum tax.
Regulated utility businesses can continue deducting all business interest expense and are not eligible for bonus depreciation on capital assets acquired and placed in service after September 27, 2017. Projects with binding contracts before September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the Protecting Americans from Tax Hikes (PATH) Act.
In addition, under the Tax Reform Legislation, net operating losses (NOL) generated after December 31, 2017 can no longer be carried back to previous tax years but can be carried forward indefinitely, with utilization limited to 80% of taxable income in the subsequent tax year.
For the year ended December 31, 2017, implementation of the Tax Reform Legislation resulted in an estimated net tax expense of $372 million and a $375 million increase in regulatory liabilities as of December 31, 2017, primarily due to the impact of the reduction of the corporate income tax rate on deferred tax assets and liabilities.
The Tax Reform Legislation is subject to further interpretation and guidance from the IRS, as well as each respective state's adoption. In addition, the regulatory treatment of certain impacts of the Tax Reform Legislation is subject to the discretion of the FERC and the Mississippi PSC. On January 31, 2018, SCS, on behalf of the traditional electric operating companies (including the Company), filed with the FERC a reduction to the Company's open access transmission tariff charge for 2018 to reflect the revised federal corporate tax rate. See Note 3 to the financial statements under "Regulatory Matters" for additional information regarding the Company's rate filings to reflect the impacts of the Tax Reform Legislation.
See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
The ultimate outcome of these matters cannot be determined at this time.
Bonus Depreciation
Under the Tax Reform Legislation, projects with binding contracts prior to September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the PATH Act.  The PATH Act allowed for 50% bonus depreciation for 2015 through 2017, 40% bonus depreciation for 2018, and 30% bonus depreciation for 2019 and certain long-lived assets placed in service in 2020. Based on provisional estimates, approximately $50 million of positive cash flows is expected to result from bonus depreciation for the 2017 tax year and approximately $10 million for the 2018 tax year. Should Southern Company have a NOL in 2018, all of these cash flows may not be fully realized in 2018. All projected tax benefits previously received for bonus depreciation related to the Kemper IGCC were repaid in connection with third quarter 2017 estimated tax payments. Additionally, Southern Company will record an abandonment loss on its 2018 corporate income tax return, which may not be fully realized should Southern Company have a NOL in 2018. See Notes 3 and 5 to the financial statements under "Kemper County Energy Facility" and "Current and Deferred Income Taxes," respectively, for additional information. The ultimate outcome of these matters cannot be determined at this time.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Section 174 Research and Experimental Deduction
Southern Company, on behalf of the Company, has reflected deductions for R&E expenditures related to the Kemper County energy facility in its federal income tax calculations since 2013 and filed amended federal income tax returns for 2008 through 2013 to also include such deductions. In December 2016, Southern Company and the IRS reached a proposed settlement, which was approved on September 8, 2017 by the U.S. Congress Joint Committee on Taxation (JCT), resolving a methodology for these deductions. As a result of this approval, the Company recognized $176 million of previously unrecognized tax benefits and reversed $36 million of associated accrued interest.
Other Matters
The Company is involved in various other matters being litigated and regulatory matters that could affect future earnings. In addition, the Company is subject to certain claims and legal actions arising in the ordinary course of business. The Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements, such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters.
The ultimate outcome of such pending or potential litigation or regulatory matters cannot be predicted at this time; however, for current proceedings not specifically reported herein or in Note 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements. See Note 3 to the financial statements for a discussion of various other contingencies, regulatory matters, and other matters being litigated which may affect future earnings potential.
In 2013, the Company submitted a claim under the Deep Horizon Economic and Property Damages Settlement Agreement associated with the oil spill that occurred in the Gulf of Mexico. The ultimate outcome of this matter cannot be determined at this time.
In 2016, the SEC began conducting a formal investigation of Southern Company and the Company concerning the estimated costs and expected in-service date of the Kemper County energy facility. On November 30, 2017, the SEC staff notified Southern Company that it had concluded its investigation with no recommended enforcement action.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Company prepares its financial statements in accordance with GAAP. Significant accounting policies are described in Note 1 to the financial statements. In the application of these policies, certain estimates are made that may have a material impact on the Company's results of operations and related disclosures. Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed the following critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Utility Regulation
The Company is subject to retail regulation by the Mississippi PSC and wholesale regulation by the FERC. These regulatory agencies set the rates the Company is permitted to charge customers based on allowable costs. As a result, the Company applies accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards has a further effect on the Company's financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the Company; therefore, the accounting estimates inherent in specific costs such as depreciation and pension and other postretirement benefits have less of a direct impact on the Company's results of operations and financial condition than they would on a non-regulated company.
As reflected in Note 1 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact the amounts of such regulatory assets and liabilities and could adversely impact the Company's financial statements.
Kemper County Energy Facility Rate Recovery
For periods prior to the second quarter 2017, significant accounting estimates included Kemper County energy facility estimated construction costs, project completion date, and rate recovery. The Company recorded total pre-tax charges to income related to the Kemper County energy facility of $428 million ($264 million after tax) in 2016, $365 million ($226 million after tax) in 2015, $868 million ($536 million after tax) in 2014, and $1.2 billion ($729 million after tax) in prior years.
As a result of the Mississippi PSC's June 21, 2017 stated intent to issue an order (which occurred on July 6, 2017) directing the Company to pursue a settlement under which the Kemper County energy facility would be operated as a natural gas plant rather than an IGCC plant, as well as the Company's June 28, 2017 suspension of the operation and start-up of the gasifier portion of the Kemper County energy facility, the estimated construction costs and project completion date are no longer considered significant accounting estimates.
Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, the Company recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine. During the third and fourth quarters of 2017, the Company recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during the suspension period prior to conclusion of the Kemper Settlement Docket, as well as a charge of $78 million associated with the Kemper Settlement Agreement.
In the aggregate, since the Kemper County energy facility project started, the Company has incurred charges of $6.20 billion ($4.14 billion after tax) through December 31, 2017. See Note 11 to the financial statements for additional information on the individual charges by quarter.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges, and no longer represents a critical accounting estimate.
See Note 3 to the financial statements under "Kemper County Energy Facility" for additional information.
Federal Tax Reform Legislation
Following the enactment of Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Notes 3 and 5 to the financial statements under "Retail Regulatory Matters – Rate Plans" and "Current and Deferred Income Taxes," respectively, for additional information.
Asset Retirement Obligations
AROs are computed as the fair value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities.
The liability for AROs primarily relates to facilities that are subject to the CCR Rule, principally ash ponds. In addition, the Company has retirement obligations related to various landfill sites, underground storage tanks, deep injection wells, water wells, substation removal, mine reclamation, and asbestos removal. The Company also has identified retirement obligations related to certain transmission and distribution facilities and certain wireless communication towers. However, liabilities for the removal of these assets have not been recorded because the settlement timing for the retirement obligations related to these assets is indeterminable and, therefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

The cost estimates for AROs related to the disposal of CCR are based on information using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations – Coal Combustion Residuals" herein and Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
Given the significant judgment involved in estimating AROs, the Company considers the liabilities for AROs to be critical accounting estimates.
Pension and Other Postretirement Benefits
The Company's calculation of pension and other postretirement benefits expense is dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term return on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over future periods and, therefore, generally affect recognized expense and the recorded obligation in future periods. While the Company believes that the assumptions used are appropriate, differences in actual experience or significant changes in assumptions would affect its pension and other postretirement benefits costs and obligations.
Key elements in determining the Company's pension and other postretirement benefit expense are the expected long-term return on plan assets and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. The expected long-term return on pension and other postretirement benefit plan assets is based on the Company's investment strategy, historical experience, and expectations for long-term rates of return that consider external actuarial advice. The Company determines the long-term return on plan assets by applying the long-term rate of expected returns on various asset classes to the Company's target asset allocation. For purposes of determining its liability related to the pension and other postretirement benefit plans, the Company discounts the future related cash flows using a single-point discount rate developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. For 2015 and prior years, the Company computed the interest cost component of its net periodic pension and other postretirement benefit plan expense using the same single-point discount rate. Beginning in 2016, the Company adopted a full yield curve approach for calculating the interest cost component whereby the discount rate for each year is applied to the liability for that specific year. As a result, the interest cost component of net periodic pension and other postretirement benefit plan expense decreased by approximately $4 million in 2016.
A 25 basis point change in any significant assumption (discount rate, salaries, or long-term return on plan assets) would result in a $2 million or less change in total annual benefit expense and a $25 million or less change in projected obligations.
See Note 2 to the financial statements for additional information regarding pension and other postretirement benefits.
Allowance for Funds Used During Construction
In accordance with regulatory treatment, the Company records AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently from such allowance, AFUDC increases the revenue requirement over the service life of the plant through a higher rate base and higher depreciation. The equity component of AFUDC is not included in the calculation of taxable income. The average annual AFUDC rate was 6.7%, 6.5%, and 5.99% for the years ended December 31, 2017, 2016, and 2015, respectively. The AFUDC rate is applied to CWIP consistent with jurisdictional regulatory treatment. AFUDC equity was $72 million, $124 million, and $110 million in 2017, 2016, and 2015, respectively. The decrease in 2017 resulted from the Kemper County energy facility project suspension in June 2017.
Unbilled Revenues
Revenues related to the retail sale of electricity are recorded when electricity is delivered to customers. However, the determination of KWH sales to individual customers is based on the reading of their meters, which is performed on a systematic basis throughout the month. At the end of each month, amounts of electricity delivered to customers, but not yet metered and billed, are estimated. Components of the unbilled revenue estimates include total KWH territorial supply, total KWH billed, estimated total electricity lost in delivery, and customer usage. These components can fluctuate as a result of a number of factors including weather, generation patterns, power delivery volume, and other operational constraints. These factors can be unpredictable and can vary from historical trends. As a result, the overall estimate of unbilled revenues could be significantly affected, which could have a material impact on the Company's results of operations.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Contingent Obligations
The Company is subject to a number of federal and state laws and regulations as well as other factors and conditions that subject it to environmental, litigation, income tax, and other risks. See FUTURE EARNINGS POTENTIAL herein and Note 3 to the financial statements for more information regarding certain of these contingencies. The Company periodically evaluates its exposure to such risks and records reserves for those matters where a non-tax-related loss is considered probable and reasonably estimable and records a tax asset or liability if it is more likely than not that a tax position will be sustained. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the Company's results of operations, cash flows, or financial condition.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives and alternative revenue programs, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed or presented separately from revenues under ASC 606 on the Company's financial statements, if material. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to equipment and cellular towers where the Company is the lessee and to equipment where the Company is the lessor. The Company is currently analyzing pole attachment agreements and a lease determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
FINANCIAL CONDITION AND LIQUIDITY
Overview and Sources of Capital
Earnings for all periods presented were negatively affected by charges associated with the Kemper IGCC. See FUTURE EARNINGS POTENTIAL – "Kemper County Energy Facility" herein and Note 3 to the financial statements for additional information.
The Company's cash requirements primarily consist of funding ongoing operations, capital expenditures, and debt maturities. Capital expenditures and other investing activities include investments to maintain existing generation facilities, to comply with environmental regulations including adding environmental modifications to certain existing generating units, to expand and improve transmission and distribution facilities, and for restoration following major storms.
The Company's financial statement presentation contemplates continuation of the Company as a going concern as a result of Southern Company's anticipated ongoing financial support of the Company. Specifically, the Company has been informed by Southern Company that in the event sufficient funds are not available from external sources, Southern Company intends to provide the Company with loans and/or equity contributions sufficient to fund the remaining indebtedness scheduled to mature and other cash needs over the next 12 months. For additional information, see Note 6 to the financial statements under "Going Concern."
On February 28, 2017, the maturity dates for $551 million in promissory notes to Southern Company were extended to July 31, 2018. In the second quarter 2017, the Company borrowed an additional $40 million under a promissory note issued to Southern Company. In June 2017, Southern Company made equity contributions totaling $1.0 billion to the Company. The Company used a portion of the proceeds to (i) prepay $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan; (ii) repay all of the $591 million outstanding principal amount of promissory notes to Southern Company; and (iii) repay $10 million of the outstanding principal amount of bank loans.
In September 2017, the Company issued a floating rate promissory note to Southern Company in an aggregate principal amount of up to $150 million bearing interest based on one-month LIBOR. The Company borrowed $109 million under this promissory note primarily to satisfy its federal income tax obligations for the quarter ended September 30, 2017 and subsequently repaid the promissory note upon receipt of its income tax refund from the U.S. government related to the settlement concerning deductible R&E expenditures. See Note 5 to the financial statements under "Section 174 Research and Experimental Deduction" for additional information.
As of December 31, 2017, the Company's current liabilities exceeded current assets by approximately $911 million primarily due to a $900 million unsecured term loan that matures on March 31, 2018. The Company expects to refinance the unsecured term loan with external security issuances and/or borrowings from financial institutions or Southern Company. To fund the Company's capital needs over the next 12 months, the Company intends to utilize operating cash flows, external security issuances, lines of credit, bank term loans, equity contributions from Southern Company, and, to the extent necessary, loans from Southern Company.
The Company's capital expenditures and debt maturities are expected to materially exceed operating cash flows through 2022. The Company plans to obtain the funds required for construction and other purposes from operating cash flows, lines of credit,

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

bank term loans, external security issuances, commercial paper, to the extent the Company is eligible to participate, and loans and/or equity contributions from Southern Company.
The Company's investments in the qualified pension plan increased in value as of December 31, 2017 as compared to December 31, 2016. No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated during 2018.
Net cash provided from operating activities totaled $503 million for 2017, an increase of $274 million as compared to 2016. The increase in cash provided from operating activities in 2017 was primarily due to tax refunds associated with the approval by the JCT of the Section 174 R&E settlement, largely offset by a decrease in income taxes related to the Kemper County energy facility and Tax Reform Legislation. Net cash provided from operating activities totaled $229 million for 2016, an increase of $56 million as compared to 2015. The increase in cash provided from operating activities in 2016 was primarily due to repayment in 2015 of ITCs relating to the Kemper County energy facility, as well as the 2015 mirror CWIP refund, partially offset by lower income tax benefits related to the Kemper County energy facility in 2016 and lower fuel rates in 2016.
Net cash used for investing activities in 2017, 2016, and 2015 totaled $504 million, $697 million, and $906 million, respectively. The cash used for investing activities in all years presented was primarily due to gross property additions related to the Kemper County energy facility. The cash used for investing activities in 2016 was partially offset by the receipt of Additional DOE Grants. The cash used for investing activities in 2015 also included gross property additions related to the Plant Daniel scrubber project.
Net cash provided from financing activities totaled $25 million in 2017 primarily due to capital contributions from Southern Company, largely offset by redemptions of long-term debt and short-term borrowings. Net cash provided from financing activities totaled $594 million in 2016 primarily due to long-term debt financings and capital contributions from Southern Company, partially offset by a decrease in short-term borrowings and redemptions of long-term debt. Net cash provided from financing activities totaled $698 million in 2015 primarily due to short-term borrowings, capital contributions from Southern Company, and long-term debt financings, partially offset by redemptions of long-term debt.
Significant balance sheet changes as of December 31, 2017 compared to 2016 include decreases of $2.5 billion in CWIP, a net change of $1.0 billion in accumulated deferred income taxes, an increase in paid-in capital of $1.0 billion due to capital contributions from Southern Company, a portion of which was used to repay $300 million of securities due within one year, $591 million of long-term debt, and $10 million of short-term debt. Long-term debt decreased primarily due to the reclassification of $1.2 billion in unsecured term loans to securities due within one year – other. Securities due within one year – parent decreased $551 million due to the repayment of promissory notes to Southern Company. Other significant balance sheet changes include $326 million in deferred charges related to income taxes. All of these changes primarily resulted from the Kemper IGCC suspension and related estimated loss. Income taxes receivable and unrecognized tax benefits also decreased due to tax refunds associated with the approval by the JCT of the Section 174 R&E settlement. The Company also had an increase of $365 million in deferred credits related to income taxes primarily resulting from the impacts of Tax Reform Legislation. See FUTURE EARNINGS POTENTIAL – "Kemper County Energy Facility" and "Income Tax Matters – Federal Tax Reform Legislation" herein and Notes 3 and 5 to the financial statements under "Kemper County Energy Facility" and "Section 174 Research and Experimental Deduction," respectively, for additional information.
The Company's ratio of common equity to total capitalization plus short-term debt was 39% and 49% at December 31, 2017 and 2016, respectively. The decrease was due to Kemper IGCC losses. See Note 6 to the financial statements for additional information.
The issuance of securities by the Company is subject to regulatory approval by the FERC. Additionally, with respect to the public offering of securities, the Company files registration statements with the SEC under the Securities Act of 1933, as amended. The amounts of securities authorized by the FERC are continuously monitored and appropriate filings are made to ensure flexibility in raising capital. Any future financing through secured debt would also require approval by the Mississippi PSC.
The Southern Company system does not maintain a centralized cash or money pool. Therefore, funds of the Company are not commingled with funds of any other company in the Southern Company system.
At December 31, 2017, the Company had approximately $248 million of cash and cash equivalents. Committed credit arrangements with banks at December 31, 2017 were $100 million, all of which is unused. In November 2017, the Company amended its one-year credit arrangements in an aggregate amount of $100 million to extend the maturity dates from 2017 to 2018.
A portion of the $100 million unused credit arrangements with banks is allocated to provide liquidity support to the Company's revenue bonds. The amount of variable rate revenue bonds outstanding requiring liquidity support as of December 31, 2017 was approximately $40 million. In addition, the Company had approximately $50 million of fixed rate revenue bonds that were remarketed from a long-term interest rate mode to an index rate mode subsequent to December 31, 2017.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Most of these bank credit arrangements, as well as the Company's term loan agreement, contain covenants that limit debt levels and typically contain cross acceleration to other indebtedness (including guarantee obligations) of the Company. Such cross-acceleration provisions to other indebtedness would trigger an event of default if the Company defaulted on indebtedness, the payment of which was then accelerated. At December 31, 2017, the Company was in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowing.
Subject to applicable market conditions, the Company expects to seek to renew or replace its credit arrangements as needed, prior to expiration. In connection therewith, the Company may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
Short-term borrowings are included in notes payable in the balance sheets. Details of short-term borrowing were as follows:
 Short-term Debt at the End of the Period 
Short-term Debt During the Period (*)
 Amount Outstanding Weighted Average Interest Rate Average Outstanding Weighted Average Interest Rate Maximum Amount Outstanding
 (in millions)   (in millions)   (in millions)
December 31, 2017$4
 3.8% $18
 3.0% $36
December 31, 2016$23
 2.6% $112
 2.0% $500
December 31, 2015$500
 1.4% $372
 1.3% $515
(*)Average and maximum amounts are based upon daily balances during the 12-month periods ended December 31.
Financing Activities
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Company plans, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Bank Term Loans and Senior Notes
In March 2017, the Company issued a $9 million short-term bank note bearing interest at 5% per annum, which was repaid in April 2017.
In June 2017, the Company used a portion of the proceeds from Southern Company equity contributions to prepay $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan, which matures on March 30, 2018, and to repay $10 million of the outstanding principal amount of bank loans. See "Parent Company Loans and Equity Contributions" herein for more information.
This unsecured term loan has covenants that limit debt levels to 65% of total capitalization, as defined in the agreement. For purposes of this definition, debt excludes the long-term debt payable to affiliated trusts and other hybrid securities. In addition, this unsecured term loan contains cross-acceleration provisions to other debt (including guarantee obligations) that would be triggered if the Company defaulted on debt above a specified threshold, the payment of which was then accelerated. The Company is currently in compliance with all such covenants.
In August 2017, the Company repaid a $12.5 million short-term bank note.
In November 2017, the Company repaid at maturity $35 million aggregate principal amount of Series 2007A 5.60% Senior Notes.
Parent Company Loans and Equity Contributions
In February 2017, the Company amended $551 million in promissory notes to Southern Company extending the maturity dates of the notes from December 1, 2017 to July 31, 2018. In the second quarter 2017, the Company borrowed an additional $40 million under a promissory note issued to Southern Company.
In June 2017, Southern Company made equity contributions totaling $1.0 billion to the Company. The Company used a portion of the proceeds to (i) prepay $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan, which matures on March 30, 2018; (ii) repay all of the $591 million outstanding principal amount of promissory notes to Southern Company; and (iii) repay a $10 million short-term bank loan.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

In September 2017, the Company issued a floating rate promissory note to Southern Company in an aggregate principal amount of up to $150 million bearing interest based on one-month LIBOR. The Company borrowed $109 million under this promissory note primarily to satisfy its federal income tax obligations for the quarter ending September 30, 2017 and subsequently repaid the promissory note upon receipt of its income tax refund from the U.S. federal government related to the settlement concerning deductible R&E expenditures. See Note 5 to the financial statements under "Section 174 Research and Experimental Deduction" for additional information.
Credit Rating Risk
At December 31, 2017, the Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
On October 4, 2017, the Company executed agreements with its largest retail customer, Chevron, to continue providing retail service to the Chevron refinery in Pascagoula, Mississippi through 2038. The agreements grant Chevron a security interest in the co-generation assets, with a net book value of approximately $93 million, located at the refinery that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of the Company's credit rating to below investment grade by two of the three rating agencies.
There are certain contracts that have required or could require collateral, but not accelerated payment, in the event of a credit rating change to BBB and/or Baa2 or below. These contracts are for physical electricity purchases and sales, fuel transportation and storage, energy price risk management, and transmission. At December 31, 2017, the maximum amount of potential collateral requirements under these contracts at a rating of BBB and/or Baa2 or BBB- and/or Baa3 was not material. The maximum potential collateral requirements at a rating below BBB- and/or Baa3 equaled approximately $241 million.
Included in these amounts are certain agreements that could require collateral in the event that Alabama Power or Georgia Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Company to access capital markets, or at a minimum the cost at which it does so.
On March 1, 2017, Moody's downgraded the senior unsecured debt rating of the Company to Ba1 from Baa3.
On March 24, 2017, S&P revised its consolidated credit rating outlook for Southern Company and its subsidiaries (including the Company) from stable to negative.
On March 30, 2017, Fitch placed the ratings of the Company on rating watch negative.
On June 22, 2017, Moody's placed the ratings of the Company on review for downgrade. On September 21, 2017, Moody's revised its rating outlook for the Company from under review to stable.
While it is unclear how the credit rating agencies, the FERC, and the Mississippi PSC may respond to the Tax Reform Legislation, certain financial metrics, such as the funds from operations to debt percentage, used by the credit rating agencies to assess Southern Company and its subsidiaries, including the Company, may be negatively impacted. Absent actions by Southern Company and its subsidiaries, including the Company, to mitigate the resulting impacts, which, among other alternatives, could include adjusting capital structure and/or monetizing regulatory assets, the Company's credit ratings could be negatively affected. See Note 3 to the financial statements under "Retail Regulatory Matters" for additional information.
Market Price Risk
Due to cost-based rate regulation and other various cost recovery mechanisms, the Company continues to have limited exposure to market volatility in interest rates, commodity fuel prices, and prices of electricity. To manage the volatility attributable to these exposures, the Company nets the exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques that include, but are not limited to, market valuation, value at risk, stress testing, and sensitivity analysis.
To mitigate future exposure to a change in interest rates, the Company may enter into derivatives that have been designated as hedges. The weighted average interest rate on $40 million of long-term variable interest rate exposure at December 31, 2017 was 2.49%. If the Company sustained a 100 basis point change in interest rates for all long-term variable interest rate exposure, the change would have an immaterial effect on annualized interest expense at December 31, 2017. See Note 1 to the financial statements under "Financial Instruments" and Note 10 to the financial statements for additional information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

To mitigate residual risks relative to movements in electricity prices, the Company enters into physical fixed-price contracts for the purchase and sale of electricity through the wholesale electricity market and, to a lesser extent, financial hedge contracts for natural gas purchases. The Company continues to manage retail fuel-hedging programs implemented per the guidelines of the Mississippi PSC and wholesale fuel-hedging programs under agreements with wholesale customers. The Company had no material change in market risk exposure for the year ended December 31, 2017 when compared to the year ended December 31, 2016.
The changes in fair value of energy-related derivative contracts are substantially attributable to both the volume and the price of natural gas. For the years ended December 31, the changes in fair value of energy-related derivative contracts, the majority of which are composed of regulatory hedges, were as follows:
 
2017
Changes
 
2016
Changes
 Fair Value
 (in millions)
Contracts outstanding at the beginning of the period, assets (liabilities), net$(7) $(47)
Contracts realized or settled8
 29
Current period changes(*)
(8) 11
Contracts outstanding at the end of the period, assets (liabilities), net$(7) $(7)
(*)Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
The net hedge volumes of energy-related derivative contracts, all of which are natural gas swaps, for the years ended December 31 were as follows:
 2017 2016
 mmBtu Volume
 (in millions)
Total hedge volume53
 36
For natural gas hedges, the weighted average swap contract cost above market prices was approximately $0.14 per mmBtu as of December 31, 2017 and $0.19 per mmBtu as of December 31, 2016. The options outstanding were immaterial for the reporting periods presented. The costs associated with natural gas hedges are recovered through the Company's ECMs.
At December 31, 2017 and 2016, substantially all of the Company's energy-related derivative contracts were designated as regulatory hedges and were related to the Company's fuel-hedging program. Therefore, gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as they are recovered through the ECM clause.
The Company uses over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. See Note 9 to the financial statements for further discussion of fair value measurements. The maturities of the energy-related derivative contracts, which are all Level 2 of the fair value hierarchy, at December 31, 2017 were as follows:
 
Fair Value Measurements
December 31, 2017
 Total Maturity
 Fair Value Year 1 Years 2&3 
 (in millions)
Level 1$
 $
 $
Level 2(7) (5) (2)
Level 3
 
 
Fair value of contracts outstanding at end of period$(7) $(5) $(2)
The Company is exposed to market price risk in the event of nonperformance by counterparties to the energy-related derivative contracts. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Therefore, the Company does not anticipate market risk exposure from nonperformance by the counterparties. For additional information, see Note 1 to the financial statements under "Financial Instruments" and Note 10 to the financial statements.
Capital Requirements and Contractual Obligations
Approximately $900 million will be required through December 31, 2018 to fund maturities of long-term debt. In addition, the Company has $40 million of tax-exempt variable rate demand obligations that are supported by short-term credit facilities and $50 million of fixed rate revenue bonds that were remarketed from a long-term interest rate mode to an index rate mode subsequent to December 31, 2017. See "Overview and Sources of Capital" herein for additional information.
The construction program of the Company is currently estimated to be $213 million for 2018, $199 million for 2019, $193 million for 2020, $167 million for 2021, and $118 million for 2022. These estimated program amounts also include capital expenditures covered under long-term service agreements. Estimated capital expenditures to comply with environmental laws and regulations included in these amounts are $14 million, $16 million, $17 million, $13 million, and $3 million for 2018, 2019, 2020, 2021, and 2022, respectively. These estimated expenditures do not include any potential compliance costs associated with the regulation of CO2 emissions from fossil fuel-fired electric generating units. See FUTURE EARNINGS POTENTIAL – "Environmental Matters – Environmental Laws and Regulations" and "– Global Climate Issues" herein for additional information.
The Company also anticipates costs associated with closure and monitoring of ash ponds in accordance with the CCR Rule, which are reflected in the Company's ARO liabilities. These costs, which could change as the Company continues to refine its assumptions underlying the cost estimates and evaluate the method and timing of compliance activities, are estimated to be $23 million, $7 million, $7 million, $9 million, and $12 million for the years 2018, 2019, 2020, 2021, and 2022, respectively. See Note 1 to the financial statements under "Asset Retirement Obligations and Other Costs of Removal" for additional information.
The construction program is subject to periodic review and revision, and actual construction costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in load projections; storm impacts; changes in environmental laws and regulations; the outcome of any legal challenges to the environmental rules; changes in generating plants, including unit retirements and replacements and adding or changing fuel sources at existing electric generating units, to meet regulatory requirements; changes in FERC rules and regulations; Mississippi PSC approvals; changes in the expected environmental compliance program; changes in legislation; the cost and efficiency of construction labor, equipment, and materials; project scope and design changes; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures will be fully recovered.
In addition, as discussed in Note 2 to the financial statements, the Company provides postretirement benefits to substantially all employees and funds trusts to the extent required by the FERC.
Other funding requirements related to obligations associated with scheduled maturities of long-term debt, as well as the related interest, derivative obligations, preferred stock dividends, unrecognized tax benefits, pension and other post-retirement benefit plans, leases, and other purchase commitments are detailed in the contractual obligations table that follows. See Notes 1, 2, 5, 6, 7, and 10 to the financial statements for additional information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Contractual Obligations
Contractual obligations at December 31, 2017 were as follows:
 2018 2019-2020 2021-2022 
After
2022
 Total
 (in millions)
Long-term debt(a) —
         
Principal$990
 $125
 $270
 $673
 $2,058
Interest86
 106
 79
 552
 823
Preferred stock dividends(b)
2
 3
 3
 
 8
Financial derivative obligations(c)
6
 3
 
 
 9
Operating leases(d)
3
 5
 4
 7
 19
Purchase commitments —         
Capital(e)
213
 379
 269
 
 861
Fuel(f)
280
 329
 191
 175
 975
Long-term service agreements(g)
33
 75
 49
 245
 402
Purchased power(h)
11
 29
 36
 454
 530
Pension and other postretirement benefits plans(i)
7
 15
 
 
 22
Total$1,631
 $1,069
 $901
 $2,106
 $5,707
(a)
All amounts are reflected based on final maturity dates except for amounts related to certain revenue bonds. The Company plans to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit. Variable rate interest obligations are estimated based on rates as of December 31, 2017, as reflected in the statements of capitalization. Fixed rates include, where applicable, the effects of interest rate derivatives employed to manage interest rate risk. Long-term debt excludes capital lease amounts (shown separately). For additional information, see Note 6 to the financial statements.
(b)Preferred stock does not mature; therefore, amounts are provided for the next five years only.
(c)
Derivative obligations are for energy-related derivatives. For additional information, see Notes 1 and 10 to the financial statements.
(d)See Note 7 to the financial statements for additional information.
(e)
The Company provides estimated capital expenditures for a five-year period, including capital expenditures associated with environmental regulations. At December 31, 2017, significant purchase commitments were outstanding in connection with the construction program. These amounts exclude capital expenditures covered under long-term service agreements, which are reflected separately. See FUTURE EARNINGS POTENTIAL – "Environmental Matters" for additional information.
(f)Fuel commitments include coal and natural gas purchases, as well as the related transportation and storage. In most cases, these contracts contain provisions for price escalation, minimum purchase levels, and other financial commitments. Natural gas purchase commitments are based on various indices at the time of delivery. Amounts reflected for natural gas purchase commitments have been estimated based on the New York Mercantile Exchange future prices at December 31, 2017.
(g)Long-term service agreements include price escalation based on inflation indices.
(h)Purchased power represents estimated minimum long-term commitments for the purchase of solar energy. Energy costs associated with solar PPAs are recovered through the fuel clause. See Notes 3 and 7 to the financial statements for additional information.
(i)The Company forecasts contributions to the pension and other postretirement benefit plans over a three-year period. The Company anticipates no mandatory contributions to the qualified pension plan during the next three years. Amounts presented represent estimated benefit payments for the nonqualified pension plans, estimated non-trust benefit payments for the other postretirement benefit plans, and estimated contributions to the other postretirement benefit plan trusts, all of which will be made from the Company's corporate assets. See Note 2 to the financial statements for additional information related to the pension and other postretirement benefit plans, including estimated benefit payments. Certain benefit payments will be made through the related benefit plans. Other benefit payments will be made from the Company's corporate assets.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

Cautionary Statement Regarding Forward-Looking Statements
The Company's 2017 Annual Report contains forward-looking statements. Forward-looking statements include, among other things, statements concerning retail rates, customer and sales growth, economic conditions, fuel and environmental cost recovery and other rate actions, current and proposed environmental regulations and related compliance plans and estimated expenditures, pending or potential litigation matters, access to sources of capital, projections for the qualified pension plan and postretirement benefit plans contributions, financing activities, filings with state and federal regulatory authorities, impacts of the Tax Reform Legislation, federal income tax benefits, estimated sales and purchases under power sale and purchase agreements, storm damage cost recovery and repairs, and estimated construction and other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:
the impact of recent and future federal and state regulatory changes, including environmental laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which the Company is subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulations and IRS interpretations, actions that may be taken in response by regulatory authorities, and its impact, if any, on the credit ratings of the Company;
current and future litigation or regulatory investigations, proceedings, or inquiries;
the effects, extent, and timing of the entry of additional competition in the markets in which the Company operates;
variations in demand for electricity, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures, including from the development and deployment of alternative energy sources such as self-generation and distributed generation technologies, and any potential economic impacts resulting from federal fiscal decisions;
available sources and costs of fuels;
effects of inflation;
the ability to control costs and avoid cost overruns during the development and construction of facilities, to construct facilities in accordance with the requirements of permits and licenses, and to satisfy any environmental performance standards, including the requirements of any tax incentives;
investment performance of the Company's employee and retiree benefit plans;
advances in technology;
state and federal rate regulations and the impact of pending and future rate cases and negotiations, including rate actions relating to fuel and other cost recovery mechanisms;
the ability to successfully operate generating, transmission, and distribution facilities and the successful performance of necessary corporate functions;
litigation related to the Kemper County energy facility;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, which cannot be assured to be completed or beneficial to the Company;
the ability of counterparties of the Company to make payments as and when due and to perform as required;
the ability to obtain new short- and long-term contracts with wholesale customers;
the direct or indirect effect on the Company's business resulting from cyber intrusion or physical attack and the threat of physical attacks;
interest rate fluctuations and financial market conditions and the results of financing efforts;
changes in the Company's credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general;
the ability of the Company to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Mississippi Power Company 2017 Annual Report

catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events such as influenzas, or other similar occurrences;
the direct or indirect effects on the Company's business resulting from incidents affecting the U.S. electric grid or operation of generating resources;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by the Company from time to time with the SEC.
The Company expressly disclaims any obligation to update any forward-looking statements.


STATEMENTS OF OPERATIONS
For the Years Ended December 31, 2017, 2016, and 2015
Mississippi Power Company 2017 Annual Report

 2017 2016 2015
 (in millions)
Operating Revenues:     
Retail revenues$854
 $859
 $776
Wholesale revenues, non-affiliates259
 261
 270
Wholesale revenues, affiliates56
 26
 76
Other revenues18
 17
 16
Total operating revenues1,187
 1,163
 1,138
Operating Expenses:     
Fuel395
 343
 443
Purchased power25
 34
 12
Other operations and maintenance282
 312
 274
Depreciation and amortization161
 132
 123
Taxes other than income taxes104
 109
 94
Estimated loss on Kemper IGCC3,362
 428
 365
Total operating expenses4,329
 1,358
 1,311
Operating Loss(3,142) (195) (173)
Other Income and (Expense):     
Allowance for equity funds used during construction72
 124
 110
Interest expense, net of amounts capitalized(42) (74) (7)
Other income (expense), net(8) (7) (8)
Total other income and (expense)22
 43
 95
Loss Before Income Taxes(3,120) (152) (78)
Income taxes (benefit)(532) (104) (72)
Net Loss(2,588) (48) (6)
Dividends on Preferred Stock2
 2
 2
Net Loss After Dividends on Preferred Stock$(2,590) $(50) $(8)
The accompanying notes are an integral part of these financial statements.

STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
For the Years Ended December 31, 2017, 2016, and 2015
Mississippi Power Company 2017 Annual Report
 2017 2016 2015
 (in millions)
Net Loss$(2,588) $(48) $(6)
Other comprehensive income (loss):     
Qualifying hedges:     
Changes in fair value, net of tax of $(1), $1, and $-,
respectively
(1) 1
 
Reclassification adjustment for amounts included in net income,
net of tax of $1, $1, and $1, respectively
1
 1
 1
Total other comprehensive income (loss)
 2
 1
Comprehensive Loss$(2,588) $(46) $(5)
The accompanying notes are an integral part of these financial statements.


STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2017, 2016, and 2015
Mississippi Power Company 2017 Annual Report
 2017 2016 2015
 (in millions)
Operating Activities:     
Net loss$(2,588) $(48) $(6)
Adjustments to reconcile net loss to net cash provided from operating activities —     
Depreciation and amortization, total198
 157
 126
Deferred income taxes(727) (67) 777
Investment tax credits
 
 (210)
Allowance for equity funds used during construction(72) (124) (110)
Pension and postretirement funding
 (47) 
Regulatory assets associated with Kemper IGCC(19) (12) (61)
Estimated loss on Kemper IGCC3,179
 428
 365
Income taxes receivable, non-current
 
 (544)
Other, net(12) (20) 8
Changes in certain current assets and liabilities —     
-Receivables540
 13
 28
-Fossil fuel stock24
 4
 (4)
-Prepaid income taxes
 39
 (35)
-Other current assets(13) (12) (14)
-Accounts payable(3) (14) (34)
-Accrued interest(29) 27
 (2)
-Accrued taxes80
 14
 (11)
-Over recovered regulatory clause revenues(51) (45) 96
-Mirror CWIP
 
 (271)
-Customer liability associated with Kemper refunds(1) (73) 73
-Other current liabilities(3) 9
 2
Net cash provided from operating activities503
 229
 173
Investing Activities:     
Property additions(429) (798) (857)
Construction payables(47) (26) (9)
Government grant proceeds
 137
 
Other investing activities(28) (10) (40)
Net cash used for investing activities(504) (697) (906)
Financing Activities:     
Decrease in notes payable, net(18) 
 
Proceeds —     
Capital contributions from parent company1,002
 627
 277
Long-term debt issuance to parent company40
 200
 275
Other long-term debt
 1,200
 
Short-term borrowings109
 
 505
Redemptions —     
Short-term borrowings(109) (478) (5)
Long-term debt to parent company(591) (225) 
Capital leases(71) (3) (3)
Senior notes(35) (300) 
Other long-term debt(300) (425) (350)
Other financing activities(2) (2) (1)
Net cash provided from financing activities25
 594
 698
Net Change in Cash and Cash Equivalents24
 126
 (35)
Cash and Cash Equivalents at Beginning of Year224
 98
 133
Cash and Cash Equivalents at End of Year$248
 $224
 $98
Supplemental Cash Flow Information:     
Cash paid (received) during the period for —     
Interest (net of $29, $49, and $66 capitalized, respectively)$65
 $50
 $45
Income taxes (net of refunds)(424) (97) (33)
Noncash transactions —     
  Accrued property additions at year-end32
 78
 105
Issuance of promissory note to parent related to repayment of
   interest-bearing refundable deposits and accrued interest

 
 301
The accompanying notes are an integral part of these financial statements. 

BALANCE SHEETS
At December 31, 2017 and 2016
Mississippi Power Company 2017 Annual Report

Assets2017 2016
 (in millions)
Current Assets:   
Cash and cash equivalents$248
 $224
Receivables —   
Customer accounts receivable36
 29
Unbilled revenues41
 42
Income taxes receivable, current4
 544
Affiliated16
 15
Other accounts and notes receivable12
 14
Fossil fuel stock17
 100
Materials and supplies, current44
 76
Other regulatory assets, current125
 115
Other current assets9
 8
Total current assets552
 1,167
Property, Plant, and Equipment:   
In service4,773
 4,865
Less: Accumulated provision for depreciation1,325
 1,289
Plant in service, net of depreciation3,448
 3,576
Construction work in progress84
 2,545
Total property, plant, and equipment3,532
 6,121
Other Property and Investments30
 12
Deferred Charges and Other Assets:   
Deferred charges related to income taxes35
 361
Other regulatory assets, deferred437
 518
Accumulated deferred income taxes247
 
Other deferred charges and assets33
 56
Total deferred charges and other assets752
 935
Total Assets$4,866
 $8,235
The accompanying notes are an integral part of these financial statements.


BALANCE SHEETS
At December 31, 2017 and 2016
Mississippi Power Company 2017 Annual Report

Liabilities and Stockholder's Equity2017 2016
 (in millions)
Current Liabilities:   
Securities due within one year —   
Parent$
 $551
Other989
 78
Notes payable4
 23
Accounts payable —   
Affiliated59
 62
Other96
 135
Accrued taxes —   
Accrued income taxes40
 
Other accrued taxes101
 99
Unrecognized tax benefits
 383
Accrued interest16
 46
Accrued compensation39
 42
Asset retirement obligations, current37
 32
Over recovered regulatory clause liabilities
 51
Other current liabilities82
 36
Total current liabilities1,463
 1,538
Long-Term Debt (See accompanying statements)
1,097
 2,424
Deferred Credits and Other Liabilities:   
Accumulated deferred income taxes
 756
Deferred credits related to income taxes372
 7
Employee benefit obligations116
 115
Asset retirement obligations, deferred137
 146
Other cost of removal obligations178
 170
Other regulatory liabilities, deferred79
 77
Other deferred credits and liabilities33
 26
Total deferred credits and other liabilities915
 1,297
Total Liabilities3,475
 5,259
Cumulative Redeemable Preferred Stock (See accompanying statements)
33
 33
Common Stockholder's Equity (See accompanying statements)
1,358
 2,943
Total Liabilities and Stockholder's Equity$4,866
 $8,235
Commitments and Contingent Matters (See notes)

 
The accompanying notes are an integral part of these financial statements.

STATEMENTS OF CAPITALIZATION
At December 31, 2017 and 2016
Mississippi Power Company 2017 Annual Report
 2017 2016 2017 2016
 (in millions) (percent of total)
Long-Term Debt:       
Long-term notes payable —       
5.60% due 2017$
 $35
    
1.63% due 201850
 50
    
5.55% due 2019125
 125
    
4.25% to 5.40% due 2035-2042630
 630
    
Adjustable rate (3.05% at 12/31/17) due 2018900
 1,200
    
Total long-term notes payable1,705
 2,040
    
Other long-term debt —       
Pollution control revenue bonds —       
5.15% due 202843
 43
    
Variable rates (2.45% to 2.50% at 12/31/17) due 201840
 40
    
Plant Daniel revenue bonds (7.13%) due 2021270
 270
    
Long-term debt payable to parent company (2.27%) due 2017
 551
    
Total other long-term debt353
 904
    
Capitalized lease obligations
 74
    
Unamortized debt premium36
 45
    
Unamortized debt discount(1) (2)    
Unamortized debt issuance expense(7) (8)    
Total long-term debt (annual interest requirement — $86 million)2,086
 3,053
    
Less amount due within one year989
 629
    
Long-term debt excluding amount due within one year1,097
 2,424
 44.1% 44.9%
Cumulative Redeemable Preferred Stock:       
$100 par value —       
Authorized — 1,244,139 shares       
Outstanding — 334,210 shares       
4.40% to 5.25% (annual dividend requirement — $2 million)33
 33
 1.3
 0.6
Common Stockholder's Equity:       
Common stock, without par value —       
Authorized — 1,130,000 shares
 
    
Outstanding — 1,121,000 shares38
 38
    
Paid-in capital4,529
 3,525
    
Accumulated deficit(3,205) (616)    
Accumulated other comprehensive loss(4) (4)    
Total common stockholder's equity1,358
 2,943
 54.6
 54.5
Total Capitalization$2,488
 $5,400
 100.0% 100.0%
The accompanying notes are an integral part of these financial statements.

STATEMENTS OF COMMON STOCKHOLDER'S EQUITY
For the Years Ended December 31, 2017, 2016, and 2015
Mississippi Power Company 2017 Annual Report
 Number of Common Shares Issued 
Common
Stock
 Paid-In Capital Retained Earnings (Accumulated Deficit) Accumulated Other Comprehensive Income (Loss) Total
 (in millions)
Balance at December 31, 20141
 $38
 $2,612
 $(559) $(7) $2,084
Net loss after dividends on preferred stock
 
 
 (8) 
 (8)
Capital contributions from parent company
 
 281
 
 
 281
Other comprehensive income (loss)
 
 
 
 1
 1
Other
 
 
 1
 
 1
Balance at December 31, 20151
 38
 2,893
 (566) (6) 2,359
Net loss after dividends on preferred stock
 
 
 (50) 
 (50)
Capital contributions from parent company
 
 632
 
 
 632
Other comprehensive income (loss)
 
 
 
 2
 2
Balance at December 31, 20161
 38
 3,525
 (616) (4) 2,943
Net loss after dividends on preferred stock
 
 
 (2,590) 
 (2,590)
Capital contributions from parent company
 
 1,004
 
 
 1,004
Other
 
 
 1
 
 1
Balance at December 31, 20171
 $38
 $4,529
 $(3,205) $(4) $1,358
The accompanying notes are an integral part of these financial statements.

NOTES TO FINANCIAL STATEMENTS
Mississippi Power Company 2017 Annual Report




Index to the Notes to Financial Statements



NOTES (continued)
Mississippi Power Company 2017 Annual Report

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
Mississippi Power Company (the Company) is a wholly-owned subsidiary of Southern Company, which is the parent company of the Company and three other traditional electric operating companies, as well as Southern Power, Southern Company Gas (as of July 1, 2016), SCS, Southern Linc, Southern Company Holdings, Inc. (Southern Holdings), Southern Nuclear, PowerSecure, Inc. (PowerSecure) (as of May 9, 2016), and other direct and indirect subsidiaries. The traditional electric operating companies – Alabama Power, Georgia Power, Gulf Power, and the Company – are vertically integrated utilities providing electric service in four Southeastern states. The Company provides electric service to retail customers in southeast Mississippi and to wholesale customers in the Southeast. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through utilities in seven states and is involved in several other complementary businesses including gas marketing services, wholesale gas services, and gas midstream operations. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary, primarily for Southern Company's investments in leveraged leases and for other electric services. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants. PowerSecure is a provider of products and services in the areas of distributed generation, energy efficiency, and utility infrastructure.
The Company is subject to regulation by the FERC and the Mississippi PSC. As such, the Company's financial statements reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by its regulatory commissions. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the financial statements have been reclassified to conform to the current year presentation.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide electricity without a defined contractual term, as well as longer-term contractual commitments, including PPAs.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives and alternative revenue programs, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed or presented separately from revenues under ASC 606 on the Company's financial statements, if material. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain

NOTES (continued)
Mississippi Power Company 2017 Annual Report

components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to equipment and cellular towers where the Company is the lessee and to equipment where the Company is the lessor. The Company is currently analyzing pole attachment agreements and a lease determination has not been made at this time. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). ASU 2016-09 changes the accounting for income taxes and the cash flow presentation for share-based payment award transactions effective for fiscal years beginning after December 15, 2016. The new guidance requires all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation to be recognized as income tax expense or benefit in the income statement. Previously, the Company recognized any excess tax benefits and deficiencies related to the exercise and vesting of stock compensation as additional paid-in capital. In addition, the new guidance requires excess tax benefits for share-based payments to be included in net cash provided from operating activities rather than net cash provided from financing activities on the statement of cash flows. The Company elected to adopt the guidance in 2016 and reflect the related adjustments as of January 1, 2016. Prior year's data presented in the financial statements has not been adjusted. The Company also elected to recognize forfeitures as they occur. The new guidance did not have a material impact on the results of operations, financial position, or cash flows of the Company. See Notes 5 and 8 for disclosures impacted by ASU 2016-09.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
Affiliate Transactions
The Company has an agreement with SCS under which the following services are rendered to the Company at direct or allocated cost: general and design engineering, operations, purchasing, accounting, finance and treasury, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, and other services with respect to business and operations, construction management, and power pool transactions. Costs for these services amounted to $140 million, $231 million, and $295 million during 2017, 2016, and 2015, respectively. Cost allocation methodologies used by SCS prior to the repeal of the Public Utility Holding Company Act of 1935, as amended, were approved by the SEC. Subsequently, additional cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies. See Note 7 under "Operating Leases" for additional information.

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Mississippi Power Company 2017 Annual Report

The Company has an agreement with Alabama Power under which the Company owns a portion of Greene County Steam Plant. Alabama Power operates Greene County Steam Plant, and the Company reimburses Alabama Power for its proportionate share of non-fuel expenditures and costs, which totaled $9 million, $13 million, and $11 million in 2017, 2016, and 2015, respectively. Also, the Company reimburses Alabama Power for any direct fuel purchases delivered from an Alabama Power transfer facility. There were no fuel purchases in 2017 or 2016. Fuel purchases were $8 million in 2015. The Company also has an agreement with Gulf Power under which Gulf Power owns a portion of Plant Daniel. The Company operates Plant Daniel, and Gulf Power reimburses the Company for its proportionate share of all associated expenditures and costs, which totaled $31 million, $26 million, and $27 million in 2017, 2016, and 2015, respectively. See Note 4 for additional information.
Total power purchased from affiliates through the power pool, included in purchased power in the statement of operations, totaled $16 million, $29 million, and $7 million in 2017, 2016, and 2015, respectively.
In June 2017, the Company received a capital contribution from Southern Company of $1.0 billion. The Company used a portion of the proceeds to repay all of the $591 million outstanding principal amount of promissory notes to Southern Company. See Note 6 for additional information.
On September 15, 2017, the Company issued a floating rate promissory note to Southern Company in an aggregate principal amount of up to $150 million bearing interest based on one-month LIBOR. The Company borrowed $109 million under this promissory note primarily to satisfy its federal income tax obligations for the quarter ending September 30, 2017 and subsequently repaid the promissory note upon receipt of its income tax refund from the U.S. federal government related to the settlement concerning deductible research and experimental (R&E) expenditures. See Note 5 under "Section 174 Research and Experimental Deduction" for additional information.
The Company also provides incidental services to and receives such services from other Southern Company subsidiaries which are generally minor in duration and amount. Except as described herein, the Company neither provided nor received any material services to or from affiliates in 2017, 2016, or 2015.
The traditional electric operating companies, including the Company, and Southern Power may jointly enter into various types of wholesale energy, natural gas, and certain other contracts, either directly or through SCS, as agent. Each participating company may be jointly and severally liable for the obligations incurred under these agreements. See Note 7 under "Fuel and Purchased Power Agreements" for additional information.
Regulatory Assets and Liabilities
The Company is subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Regulatory assets and (liabilities) reflected in the balance sheets at December 31 relate to:
 2017
 2016
 Note
 (in millions)
Retiree benefit plans – regulatory assets$174
 $173
 (a)
Asset retirement obligations95
 83
 (b)
Kemper County energy facility88
 194
 (c)
Remaining net book value of retired assets44
 53
 (d)
Property tax43
 37
 (e)
Deferred charges related to income taxes36
 362
 (d)
Plant Daniel Units 3 and 436
 33
 (f)
Other regulatory assets28
 28
 (g)
ECO carryforward26
 22
 (h)
Other regulatory liabilities
 (1) (i)
Deferred credits related to income taxes(377) (9) (j)
Other cost of removal obligations(178) (170) (k)
Property damage(57) (68) (l)
Total regulatory assets (liabilities), net$(42) $737
  
Note: The recovery and amortization periods for these regulatory assets and (liabilities) are as follows:
(a)Recovered and amortized over the average remaining service period which may range up to 15 years. See Note 2 for additional information.
(b)To be recovered upon completion of removal activities over a period approved by the Mississippi PSC.
(c)Includes $114 million of regulatory assets and $26 million of regulatory liabilities to be recovered in rates over periods of eight and six years, respectively. For additional information, see Note 3 under "Kemper County Energy Facility – Rate Recovery – Kemper Settlement Agreement."
(d)Recovered over the related property lives up to 48 years.
(e)
Recovered through the ad valorem tax adjustment clause over a 12-month period beginning in April of the following year. See Note 3 under "Retail Regulatory Matters – Ad Valorem Tax Adjustment" for additional information.
(f)Represents the difference between the revenue requirement under the purchase option and the revenue requirement assuming operating lease accounting treatment for the extended term, which will be amortized over a 10-year period beginning October 2021.
(g)Comprised of vacation pay, loss on reacquired debt, and other miscellaneous assets. These costs are recorded and recovered or amortized as approved by the Mississippi PSC over periods which may range up to 50 years. This amount also includes fuel-hedging assets and liabilities which are recorded over the life of the underlying hedged purchase contracts, which generally do not exceed three years. Upon final settlement, actual costs incurred are recovered through the ECM.
(h)Recovered through the ECO clause in the year following the deferral.
(i)Comprised of numerous immaterial components including deferred income tax credits and other miscellaneous liabilities that are recorded and refunded or amortized as approved by the Mississippi PSC generally over periods not exceeding one year.
(j)This amount includes excess deferred income taxes primarily associated with Tax Reform Legislation of $375 million, of which $273 million is related to protected deferred income taxes to be recovered over the related property lives utilizing the average rate assumption method in accordance with IRS normalization principles and $102 million related to unprotected (not subject to normalization) deferred income taxes to be amortized over a period approved by the Mississippi PSC or the FERC, as appropriate. Of the total excess deferred income taxes associated with Tax Reform Legislation, $129 million is associated with the Kemper County energy facility. The unprotected portion associated with the Kemper County energy facility is $54 million, of which $38 million is being amortized over eight years for retail as approved by the Mississippi PSC on February 6, 2018 and $16 million is wholesale-related. Currently, the Company is requesting eight-year amortization for the remaining portions of the unprotected deferred income taxes associated with Tax Reform Legislation in all of its retail and wholesale rate filings. See Note 3 under "Retail Regulatory Matters" and "Kemper County Energy Facility" and Note 5 for additional information.
(k)Collected in advance from customers to remove assets upon their retirement.
(l)For additional information, see Note 1 under "Provision for Property Damage."
In the event that a portion of the Company's operations is no longer subject to applicable accounting rules for rate regulation, the Company would be required to write off to income or reclassify to accumulated OCI related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the Company would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 3 under "Retail Regulatory Matters" and "Kemper County Energy Facility" for additional information.

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Mississippi Power Company 2017 Annual Report

Government Grants
In 2010, the DOE, through a cooperative agreement with SCS, agreed to fund $270 million of the Kemper County energy facility through the grants awarded to the project by the DOE under the Clean Coal Power Initiative Round 2 (Initial DOE Grants). Through December 31, 2017, the Company has received grant funds of $382 million, of which $245 million of the Initial DOE Grants were used for the construction of the Kemper County energy facility, which is reflected in the Company's financial statements as a reduction to the Kemper County energy facility capital costs, and $137 million received on April 8, 2016 (Additional DOE Grants), which are expected to be used to reduce future rate impacts. An additional $2 million is expected to be received for allowable costs through December 31, 2017. See Note 3 under "Kemper County Energy Facility – Schedule and Cost Estimate" for additional information.
Revenues
Energy and other revenues are recognized as services are provided. Wholesale capacity revenues from long-term contracts are recognized at the lesser of the levelized amount or the amount billable under the contract over the respective contract period. Unbilled revenues related to retail sales are accrued at the end of each fiscal period. The Company's retail and wholesale rates include provisions to adjust billings for fluctuations in fuel costs, fuel hedging, the energy component of purchased power costs, and certain other costs. Retail rates also include provisions to adjust billings for fluctuations in costs for ad valorem taxes and certain qualifying environmental costs. Revenues are adjusted for differences between these actual costs and projected amounts billed in current regulated rates. Under or over recovered regulatory clause revenues are recorded in the balance sheets and are recovered or returned to customers through adjustments to the billing factors. The Company is required to file with the Mississippi PSC for an adjustment to the fuel cost recovery, ad valorem, and environmental factors annually.
The Company serves long-term contracts with rural electric cooperative associations and municipalities located in southeastern Mississippi under cost-based MRA electric tariffs which are subject to regulation by the FERC. The contracts with these wholesale customers represented 19.3% of the Company's total operating revenues in2017 and are largely subject to rolling 10-year cancellation notices. Historically, these wholesale customers have acted as a group and any changes in contractual relationships for one customer are likely to be followed by the other wholesale customers.
Except as described above for the Company's cost-based MRA electric tariff customers, the Company has a diversified base of customers and no single customer or industry comprises 10% or more of revenues. For all periods presented, uncollectible accounts averaged less than 1% of revenues.
See Note 3 under "Retail Regulatory Matters" for additional information.
Fuel Costs
Fuel costs are expensed as the fuel is used. Fuel expense generally includes fuel transportation costs and the cost of purchased emissions allowances as they are used. Fuel costs also include gains and/or losses from fuel-hedging programs as approved by the Mississippi PSC.
Income and Other Taxes
The Company uses the liability method of accounting for deferred income taxes and provides deferred income taxes for all significant income tax temporary differences. ITCs utilized are deferred and amortized to income over the average life of the related property. Taxes that are collected from customers on behalf of governmental agencies to be remitted to these agencies are presented net on the statements of operations.
The Company recognizes tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 5 under "Unrecognized Tax Benefits" for additional information.
Property, Plant, and Equipment
Property, plant, and equipment is stated at original cost less any regulatory disallowances and impairments. Original cost includes: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and cost of equity funds used during construction for projects where recovery of CWIP is not allowed in rates.

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Mississippi Power Company 2017 Annual Report

The Company's property, plant, and equipment in service consisted of the following at December 31:
 2017 2016
 (in millions)
Generation$2,801
 $2,632
Transmission737
 712
Distribution946
 916
General204
 520
Plant acquisition adjustment85
 85
Total plant in service$4,773
 $4,865
The cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses except for a portion of the railway track maintenance costs. The portion of railway track maintenance costs not charged to operations and maintenance expenses are charged to fuel stock and recovered through the Company's fuel clause.
Depreciation, Depletion, and Amortization
Depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates, which approximated 3.7% in 2017, 4.2% in 2016, and 4.7% in 2015. The decrease in 2017 is primarily due to lower depreciation expense as a result of recording a loss on the lignite mine in June 2017. The decrease in the 2016 depreciation rate is primarily due to fully depreciating and retiring the ARO at Plant Watson, partially offset by the increase in depreciation for the Plant Daniel scrubbers for a full year. See "Asset Retirement Obligations and Other Costs of Removal" herein for additional information. Depreciation studies are conducted periodically to update the composite rates. The Mississippi PSC approved the 2014 study, with new rates effective January 1, 2015. When property subject to depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. Minor items of property included in the original cost of the plant are retired when the related property unit is retired. Depreciation includes an amount for the expected cost of removal of facilities, except for the Kemper County energy facility combined cycle and related assets in service.
Asset Retirement Obligations and Other Costs of Removal
AROs are computed as the present value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. The Company has received accounting guidance from the Mississippi PSC allowing the continued accrual of other future retirement costs for long-lived assets that the Company does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as a regulatory liability.
The liability for AROs primarily relates to facilities that are subject to the Disposal of Coal Combustion Residuals from Electric Utilities final rule published by the EPA in 2015 (CCR Rule), principally ash ponds. In addition, the Company has retirement obligations related to various landfill sites, underground storage tanks, deep injection wells, water wells, substation removal, mine reclamation, and asbestos removal. The Company also has identified AROs related to certain transmission and distribution facilities and certain wireless communication towers. However, liabilities for the removal of these assets have not been recorded because the settlement timing for the AROs related to these assets is indeterminable and, therefore, the fair value of the AROs cannot be reasonably estimated. A liability for these AROs will be recognized when sufficient information becomes available to support a reasonable estimation of the ARO. The Company will continue to recognize in the statements of operations allowed removal costs in accordance with its regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability, as ordered by the Mississippi PSC, and are reflected in the balance sheets.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Details of the AROs included in the balance sheets are as follows:
 2017 2016
 (in millions)
Balance at beginning of year$179
 $177
Liabilities incurred
 15
Liabilities settled(23) (23)
Accretion5
 5
Cash flow revisions13
 5
Balance at end of year$174
 $179
The increase in cash flow revisions in 2017 is primarily related to a revision in the closure date of the lignite mine ARO.
The cost estimates for AROs related to the CCR Rule are based on information as of December 31, 2017 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule requirements for closure. As further analysis is performed and closure details are developed, the Company will continue to periodically update these cost estimates as necessary.
Allowance for Funds Used During Construction
The Company records AFUDC, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the plant through a higher rate base and higher depreciation. The equity component of AFUDC is not included in the calculation of taxable income. The average annual AFUDC rate was 6.7%, 6.5%, and 5.99% for the years ended December 31, 2017, 2016, and 2015, respectively. AFUDC equity was $72 million, $124 million, and $110 million in 2017, 2016, and 2015, respectively. The decrease in 2017 resulted from the Kemper IGCC project suspension in June 2017.
Impairment of Long-Lived Assets and Intangibles
The Company evaluates long-lived assets for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance or an estimate of undiscounted future cash flows attributable to the assets, as compared with the carrying value of the assets. If an impairment has occurred, the amount of the impairment recognized is determined by either the amount of regulatory disallowance or by estimating the fair value of the assets and recording a loss if the carrying value is greater than the fair value. For assets identified as held for sale, the carrying value is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change.
Provision for Property Damage
The Company carries insurance for the cost of certain types of damage to generation plants and general property. However, the Company is self-insured for the cost of storm, fire, and other uninsured casualty damage to its property, including transmission and distribution facilities. As permitted by the Mississippi PSC and the FERC, the Company accrues for the cost of such damage through an annual expense accrual credited to regulatory liability accounts for the retail and wholesale jurisdictions. The cost of repairing actual damage resulting from such events that individually exceed $50,000 is charged to the reserve. Every three years the Mississippi PSC, the MPUS, and the Company will agree on SRR revenue level(s) for the ensuing period, based on historical data, expected exposure, type and amount of insurance coverage, excluding insurance cost, and any other relevant information. The accrual amount and the reserve balance are determined based on the SRR revenue level(s). If a significant change in circumstances occurs, then the SRR revenue level can be adjusted more frequently if the Company and the MPUS or the Mississippi PSC deem the change appropriate. The property damage reserve accrual will be the difference between the approved SRR revenues and the SRR revenue requirement, excluding any accrual to the reserve. In addition, SRR allows the Company to set up a regulatory asset, pending review, if the allowable actual retail property damage costs exceed the amount in the retail property damage reserve. The Company made retail accruals of $3 million, $4 million, and $3 million for 2017, 2016, and 2015, respectively. The Company also accrued $0.3 million annually in 2017, 2016, and 2015 for the wholesale jurisdiction. As of December 31, 2017, the property damage reserve balances were $56 million and $1 million for retail and wholesale, respectively.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Cash and Cash Equivalents
For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
Materials and Supplies
Generally, materials and supplies include the average cost of transmission, distribution, mining, and generating plant materials. Materials are charged to inventory when purchased and then expensed, capitalized to plant, or charged to fuel stock, as used, at weighted-average cost when utilized.
Fuel Inventory
Fuel inventory includes the average cost of coal, natural gas, oil, transportation, and emissions allowances. Fuel costs are recorded to inventory when purchased, and then expensed, at weighted average cost, as used and recovered by the Company through fuel cost recovery rates. The retail rate is approved by the Mississippi PSC and the wholesale rates are approved by the FERC. Emissions allowances granted by the EPA are included in inventory at zero cost.
Financial Instruments
The Company uses derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, and electricity purchases and sales. All derivative financial instruments are recognized as either assets or liabilities on the balance sheets (included in "Other" or shown separately as "Risk Management Activities") and are measured at fair value. See Note 9 for additional information regarding fair value. Substantially all of the Company's bulk energy purchases and sales contracts that meet the definition of a derivative are excluded from the fair value accounting requirements because they qualify for the "normal" scope exception, and are accounted for under the accrual method. Fuel and interest rate derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the Mississippi PSC approved fuel-hedging program as discussed below result in the deferral of related gains and losses in OCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recorded on a net basis in the statements of operations. Cash flows from derivatives are classified on the statement of cash flows in the same category as the hedged item. See Note 10 for additional information regarding derivatives.
The Company offsets fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a netting arrangement. Additionally, the Company's collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2017 are immaterial.
The Company has an ECM clause which, among other things, allows the Company to utilize financial instruments to hedge its fuel commitments. Changes in the fair value of these financial instruments are recorded as regulatory assets or liabilities. Amounts paid or received as a result of financial settlement of these instruments are classified as fuel expense and are included in the ECM factor applied to customer billings. The Company's jurisdictional wholesale customers have a similar ECM mechanism, which has been approved by the FERC.
The Company is exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Company has established controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk.
Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income, changes in the fair value of qualifying cash flow hedges, and reclassifications for amounts included in net income.
Variable Interest Entities
The primary beneficiary of a variable interest entity (VIE) is required to consolidate the VIE when it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE.
The Company was required to provide financing for all costs associated with the mine development and operation under a contract with Liberty Fuels Company, LLC, a subsidiary of North American Coal Corporation (Liberty Fuels), in conjunction with the construction of the Kemper County energy facility. Liberty Fuels qualified as a VIE for which the Company was the primary beneficiary. As of December 31, 2016, the VIE consolidation resulted in an ARO asset and associated liability in the

NOTES (continued)
Mississippi Power Company 2017 Annual Report

amounts of $20 million and $24 million, respectively. As of December 31, 2017, the VIE consolidation resulted in an ARO liability in the amount of $38 million. The associated ARO asset was included as part of an additional charge to income in 2017 as a result of the Company's assessment of the probability of disallowance by the Mississippi PSC. See Note 3 under "Kemper County Energy Facility" for additional information.
2. RETIREMENT BENEFITS
The Company has a defined benefit, trusteed, pension plan covering substantially all employees. This qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2018. The Company also provides certain defined benefit pension plans for a selected group of management and highly compensated employees. Benefits under these non-qualified pension plans are funded on a cash basis. In addition, the Company provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The Company funds its other postretirement trusts to the extent required by the FERC. For the year ending December 31, 2018, no other postretirement trust contributions are expected.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Actuarial Assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for the following year and the benefit obligations as of the measurement date are presented below.
Assumptions used to determine net periodic costs:2017 2016 2015
Pension plans     
Discount rate – benefit obligations4.44% 4.69% 4.17%
Discount rate – interest costs3.81
 3.97
 4.17
Discount rate – service costs4.83
 5.04
 4.49
Expected long-term return on plan assets7.95
 8.20
 8.20
Annual salary increase4.46
 4.46
 3.59
Other postretirement benefit plans     
Discount rate – benefit obligations4.22% 4.47% 4.03%
Discount rate – interest costs3.55
 3.66
 4.03
Discount rate – service costs4.65
 4.88
 4.38
Expected long-term return on plan assets6.88
 7.07
 7.23
Annual salary increase4.46
 4.46
 3.59
Assumptions used to determine benefit obligations:2017 2016
Pension plans   
Discount rate3.80% 4.44%
Annual salary increase4.46
 4.46
Other postretirement benefit plans   
Discount rate3.68% 4.22%
Annual salary increase4.46
 4.46
The Company estimates the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of eight different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO as of December 31, 2017 were as follows:
 Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached
Pre-656.50% 4.50% 2026
Post-65 medical5.00
 4.50
 2026
Post-65 prescription10.00
 4.50
 2026
An annual increase or decrease in the assumed medical care cost trend rate of 1% would affect the APBO and the service and interest cost components at December 31, 2017 as follows:
 
1 Percent
Increase
 
1 Percent
Decrease
 (in millions)
Benefit obligation$5
 $5
Service and interest costs
 
Pension Plans
The total accumulated benefit obligation for the pension plans was $541 million at December 31, 2017 and $479 million at December 31, 2016. Changes in the projected benefit obligations and the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$534
 $500
Service cost15
 13
Interest cost20
 19
Benefits paid(22) (20)
Actuarial (gain) loss55
 22
Balance at end of year602
 534
Change in plan assets   
Fair value of plan assets at beginning of year499
 430
Actual return (loss) on plan assets84
 39
Employer contributions2
 50
Benefits paid(22) (20)
Fair value of plan assets at end of year563
 499
Accrued liability$(39) $(35)
At December 31, 2017, the projected benefit obligations for the qualified and non-qualified pension plans were $571 million and $31 million, respectively. All pension plan assets are related to the qualified pension plan.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's pension plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$158
 $154
Other current liabilities(3) (3)
Employee benefit obligations(36) (32)
Presented below are the amounts included in regulatory assets at December 31, 2017 and 2016 related to the defined benefit pension plans that had not yet been recognized in net periodic pension cost along with the estimated amortization of such amounts for 2018.
 2017 2016 Estimated Amortization in 2018
 (in millions)
Prior service cost$3
 $3
 $
Net (gain) loss155
 151
 10
Regulatory assets$158
 $154
  
The changes in the balance of regulatory assets related to the defined benefit pension plans for the years ended December 31, 2017 and 2016 are presented in the following table:
 2017 2016
 (in millions)
Regulatory assets:   
Beginning balance$154
 $144
Net (gain) loss12
 16
Change in prior service costs
 2
Reclassification adjustments:   
Amortization of prior service costs(1) (1)
Amortization of net gain (loss)(7) (7)
Total reclassification adjustments(8) (8)
Total change4
 10
Ending balance$158
 $154
Components of net periodic pension cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$15
 $13
 $13
Interest cost20
 19
 21
Expected return on plan assets(40) (35) (33)
Recognized net (gain) loss7
 7
 10
Net amortization1
 1
 1
Net periodic pension cost$3
 $5
 $12
Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Company has elected to amortize changes in the market value of all plan assets over five years rather than recognize the changes immediately. As a result, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2017, estimated benefit payments were as follows:
 
Benefit
Payments
 (in millions)
2018$23
201924
202026
202127
202228
2023 to 2027164
Other Postretirement Benefits
Changes in the APBO and in the fair value of plan assets during the plan years ended December 31, 2017 and 2016 were as follows:
 2017 2016
 (in millions)
Change in benefit obligation   
Benefit obligation at beginning of year$97
 $97
Service cost1
 1
Interest cost3
 3
Benefits paid(6) (6)
Actuarial (gain) loss1
 1
Retiree drug subsidy1
 1
Balance at end of year97
 97
Change in plan assets   
Fair value of plan assets at beginning of year23
 23
Actual return (loss) on plan assets3
 1
Employer contributions4
 4
Benefits paid(5) (5)
Fair value of plan assets at end of year25
 23
Accrued liability$(72) $(74)
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's other postretirement benefit plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$18
 $21
Other regulatory liabilities, deferred(1) (2)
Employee benefit obligations(72) (74)

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Approximately $17 million and $19 million was included in net regulatory assets at December 31, 2017 and 2016, respectively, related to the net loss for the other postretirement benefit plans that had not yet been recognized in net periodic other postretirement benefit cost. The estimated amortization of such amounts for 2018 is $1 million.
The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2017 and 2016 are presented in the following table:
 2017 2016
 (in millions)
Net regulatory assets (liabilities):   
Beginning balance$19
 $18
Net (gain) loss(1) 2
Reclassification adjustments:   
Amortization of net gain (loss)(1) (1)
Total reclassification adjustments(1) (1)
Total change(2) 1
Ending balance$17
 $19
Components of the other postretirement benefit plans' net periodic cost were as follows:
 2017 2016 2015
 (in millions)
Service cost$1
 $1
 $1
Interest cost3
 3
 4
Expected return on plan assets(1) (1) (2)
Net amortization1
 1
 1
Net periodic postretirement benefit cost$4
 $4
 $4
Future benefit payments, including prescription drug benefits, reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans. Estimated benefit payments are reduced by drug subsidy receipts expected as a result of the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 as follows:
 
Benefit
Payments
 
Subsidy
Receipts
 Total
 (in millions)
2018$6
 $
 $6
20196
 
 6
20206
 (1) 5
20217
 (1) 6
20227
 (1) 6
2023 to 202734
 (2) 32
Benefit Plan Assets
Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code of 1986, as amended (Internal Revenue Code). The Company's investment policies for both the pension plan and the other postretirement benefit plans cover a diversified mix of assets, including equity and fixed income securities, real estate, and private equity. Derivative instruments are used primarily to gain efficient exposure to the various asset classes and as hedging tools. The Company minimizes the risk of large losses primarily through diversification but also monitors and manages other aspects of risk.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

The composition of the Company's pension plan and other postretirement benefit plan assets as of December 31, 2017 and 2016, along with the targeted mix of assets for each plan, is presented below:
 Target 2017 2016
Pension plan assets:     
Domestic equity26% 31% 29%
International equity25
 25
 22
Fixed income23
 24
 29
Special situations3
 1
 2
Real estate investments14
 13
 13
Private equity9
 6
 5
Total100% 100% 100%
Other postretirement benefit plan assets:     
Domestic equity21% 25% 23%
International equity21
 20
 18
Domestic fixed income37
 38
 43
Special situations2
 1
 2
Real estate investments12
 11
 10
Private equity7
 5
 4
Total100% 100% 100%
The investment strategy for plan assets related to the Company's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Company employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.
Investment Strategies
Detailed below is a description of the investment strategies for each major asset category for the pension and other postretirement benefit plans disclosed above:
Domestic equity. A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.
International equity. A mix of growth stocks and value stocks with both developed and emerging market exposure, managed both actively and through passive index approaches.
Fixed income. A mix of domestic and international bonds.
Special situations. Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies as well as investments in promising new strategies of a longer-term nature.
Real estate investments. Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities.
Private equity. Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.
Benefit Plan Asset Fair Values
Following are the fair value measurements for the pension plan and the other postretirement benefit plan assets as of December 31, 2017 and 2016. The fair values presented are prepared in accordance with GAAP. For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management

NOTES (continued)
Mississippi Power Company 2017 Annual Report

relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate.
Valuation methods of the primary fair value measurements disclosed in the following tables are as follows:
Domestic and international equity.Investments in equity securities such as common stocks, American depositary receipts, and real estate investment trusts that trade on a public exchange are classified as Level 1 investments and are valued at the closing price in the active market. Equity investments with unpublished prices (i.e. pooled funds) are valued as Level 2, when the underlying holdings used to value the investment are comprised of Level 1 or Level 2 equity securities.
Fixed income.Investments in fixed income securities are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Real estate investments, private equity, and special situations investments.Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.
The fair values of pension plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$113
 $55
 $
 $
 $168
International equity(*)
73
 66
 
 
 139
Fixed income:         
U.S. Treasury, government, and agency bonds
 40
 
 
 40
Corporate bonds
 56
 
 
 56
Pooled funds
 31
 
 
 31
Cash equivalents and other10
 1
 
 
 11
Real estate investments22
 
 
 56
 78
Special situations
 
 
 9
 9
Private equity
 
 
 32
 32
Total$218
 $249
 $
 $97
 $564
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$95
 $44
 $
 $
 $139
International equity(*)
58
 51
 
 
 109
Fixed income:         
U.S. Treasury, government, and agency bonds
 28
 
 
 28
Mortgage- and asset-backed securities
 1
 
 
 1
Corporate bonds
 46
 
 
 46
Pooled funds
 25
 
 
 25
Cash equivalents and other47
 
 
 
 47
Real estate investments15
 
 
 54
 69
Special situations
 
 
 8
 8
Private equity
 
 
 26
 26
Total$215
 $195
 $
 $88
 $498
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
The fair values of other postretirement benefit plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$4
 $2
 $
 $
 $6
International equity(*)
3
 2
 
 
 5
Fixed income:         
U.S. Treasury, government, and agency bonds
 5
 
 
 5
Corporate bonds
 2
 
 
 2
Pooled funds
 1
 
 
 1
Cash equivalents and other1
 
 
 
 1
Real estate investments1
 
 
 2
 3
Private equity
 
 
 1
 1
Total$9
 $12
 $
 $3
 $24
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$4
 $2
 $
 $
 $6
International equity(*)
2
 2
 
 
 4
Fixed income:         
U.S. Treasury, government, and agency bonds
 5
 
 
 5
Corporate bonds
 2
 
 
 2
Pooled funds
 1
 
 
 1
Cash equivalents and other2
 
 
 
 2
Real estate investments1
 
 
 2
 3
Private equity
 
 
 1
 1
Total$9
 $12
 $
 $3
 $24
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Employee Savings Plan
The Company also sponsors a 401(k) defined contribution plan covering substantially all employees. The Company matches a portion of the first 6% of employee base salary contributions. The maximum Company match is 5.1% of an employee's base salary. Total matching contributions made to the plan for 2017, 2016, and 2015 were $5 million each year.
3. CONTINGENCIES AND REGULATORY MATTERS
General Litigation Matters
The Company is subject to certain claims and legal actions arising in the ordinary course of business. In addition, the Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions, CCR, and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters. The ultimate outcome of such pending or potential litigation against the Company cannot be predicted at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements.
Environmental Matters
Environmental Remediation
The Company must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Company may also incur substantial costs to clean up affected sites. The Company has authority from the Mississippi PSC to recover approved environmental compliance costs through established regulatory mechanisms. The Company recognizes a liability for environmental remediation costs only when it determines a loss is probable and reasonably estimable.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

FERC Matters
Municipal and Rural Associations Tariff
The CompanyMississippi Power provides wholesale electric service to Cooperative Energy, East Mississippi Electric Power Association, and the City of Collins, all located in southeastern Mississippi, under a long-term, cost-based, FERC regulatedFERC-regulated MRA tariff.
In March 2016, the Company reached a settlement agreement with its wholesale customers, which was subsequently approved by the FERC, for an increase in wholesale base revenues under the MRA cost-based electric tariff, primarily as a result of placing scrubbers for Plant Daniel Units 1 and 2 in service in 2015. The settlement agreement became effective for services rendered beginning May 1, 2016, resulting in an estimated annual revenue increase of $7 million under the MRA cost-based electric tariff. Additionally, under the settlement agreement, the tariff customers agreed to similar regulatory treatment for MRA tariff ratemaking as the treatment approved for retail ratemaking through an order issued by the2017, Mississippi PSC in December 2015 (In-Service Asset Rate Order). This regulatory treatment primarily includes (i) recovery of the operational Kemper County energy facility assets providing service to customers and other related costs, (ii) amortization of the Kemper County energy facility-related regulatory assets included in rates under the settlement agreement over the 36 months ending April 30, 2019, (iii) Kemper County energy facility-related expenses included in rates under the settlement agreement no longer being deferred and charged to expense, and (iv) removing all of the Kemper County energy facility CWIP from rate base with a corresponding increase in accrual of AFUDC. The additional resulting AFUDC totaled approximately $22 million through the suspension of Kemper IGCC start-up activities and has been recorded as a charge to income.
On September 18, 2017, the CompanyPower and Cooperative Energy executed, and the FERC accepted, a Shared Service Agreement (SSA), as part of the MRA tariff, under which the CompanyMississippi Power and Cooperative Energy will share in providing electricity to allthe Cooperative Energy delivery points in lieu ofunder the current arrangementtariff. In August 2022, the FERC accepted an amended SSA between Mississippi Power and Cooperative Energy, effective July 1, 2022, under which each delivery point is specifically assigned to either entity. The SSA accepted by the FERC on October 31, 2017 became effective on January 1, 2018 and may be cancelled by Cooperative Energy with 10 years notice after December 31, 2020. The SSA provides Cooperative Energy the optionwill continue to decrease its use of the Company'sMississippi Power's generation services under the MRA tariff subjectup to annual and cumulative caps and a one-year notice requirement. In the event Cooperative Energy elects to reduce these services, the related reduction in the Company's revenues is not expected to be significant2.5% annually through 2020.
Fuel Cost Recovery
The Company has a wholesale MRA and a Market Based (MB) fuel cost recovery factor.2035. At December 31, 2017, over-recovered wholesale2023, Mississippi Power is serving approximately 390 MWs of Cooperative Energy's annual demand. Beginning in 2036, Cooperative Energy will provide 100% of its electricity requirements at the MRA fuel costs were immaterial and at December 31, 2016 were approximately $13 million, and is included in over-recovered regulatory clause liabilities, current indelivery points under the balance sheet. Effective January 1, 2018,tariff. Neither party has the wholesale MRA fuel rate increased $11 million annually.option to cancel the amended SSA.
The Company's operating revenues are adjusted for differences in actual recoverable fuel cost and amounts billed in accordance with the currently approved cost recovery rate. Accordingly, changes in the billing factor should have no significant effect on the Company's revenues or net income, but will affect cash flow.
Market-Based Rate Authority
The Company has authority fromOn October 27, 2023, the FERC approved a settlement agreement filed by Mississippi Power and Cooperative Energy on July 31, 2023 related to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies (including the Company) and Southern Power filed a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' (including the Company's) and SouthernMississippi Power's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies (including the Company) and Southern Power filed aJuly 2022 request for rehearinga $23 million increase in annual wholesale base revenues under the MRA tariff. The settlement agreement provides for a $16 million increase in annual wholesale base revenues, effective September 14, 2022, and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies (including the Company) and Southern Power filed an amendmenta refund to their market-based rate tariff that proposed certain changescustomers of approximately $6 million primarily related to the energy auction, as well as several non-tariff changes. On February 2, 2017,difference between the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigation for the traditional electric operating companies' (including the Company's)approved rates and Southern Power's potential to exert market power in certain areas served by the traditional electric operating companies (including the Company) and ininterim rates.
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Mississippi Power Company 2017 Annual Report

Southern Company Gas
some adjacent areas. On May 17, 2017,Utility Regulation and Rate Design
The natural gas distribution utilities are subject to regulation and oversight by their respective state regulatory agencies. Rates charged to customers vary according to customer class (residential, commercial, or industrial) and rate jurisdiction. These agencies approve rates designed to provide the FERC acceptedopportunity to generate revenues to recover all prudently-incurred costs, including a return on rate base sufficient to pay interest on debt and provide a reasonable ROE.
As a result of operating in a deregulated environment, Atlanta Gas Light earns revenue by charging rates to its customers based primarily on monthly fixed charges that are set by the traditional electric operating companies' (includingGeorgia PSC and adjusted periodically. The Marketers add these fixed charges when billing their respective customers. This mechanism, called a straight-fixed-variable rate design, minimizes the Company's) and Southern Power's compliance filing acceptingseasonality of Atlanta Gas Light's revenues since the termsmonthly fixed charge is not volumetric or directly weather dependent.
With the exception of Atlanta Gas Light, the earnings of the order. Whilenatural gas distribution utilities can be affected by customer consumption patterns that are largely a function of weather conditions and price levels for natural gas. Specifically, customer demand substantially increases during the FERC's February 2, 2017 order referencesHeating Season when natural gas is used for heating purposes. Southern Company Gas has various mechanisms, such as weather and revenue normalization mechanisms and weather derivative instruments, that limit exposure to weather changes within typical ranges in these utilities' respective service territories.
In addition to natural gas cost recovery mechanisms, other cost recovery mechanisms and regulatory riders, which vary by utility, allow recovery of certain costs, such as those related to infrastructure replacement programs as well as environmental remediation, energy efficiency plans, and bad debts. In traditional rate designs, utilities recover a significant portion of the market power proceeding discussed above, it remainsfixed customer service and pipeline infrastructure costs based on assumed natural gas volumes used by customers. With the exception of Chattanooga Gas, the natural gas distribution utilities have decoupled regulatory mechanisms that Southern Company Gas believes encourage conservation by separating the recoverable amount of these fixed costs from the amounts of natural gas used by customers. See "Rate Proceedings" herein for additional information. Also see "Infrastructure Replacement Programs and Capital Projects" herein for additional information regarding infrastructure replacement programs at certain of the natural gas distribution utilities.
The following table provides regulatory information for Southern Company Gas' natural gas distribution utilities:
Nicor GasAtlanta Gas LightVirginia Natural GasChattanooga Gas
Authorized ROE at December 31, 20239.51%10.25%9.70%9.80%
Weather normalization mechanisms(a)
üü
Decoupled, including straight-fixed-variable rates(b)
üüü
Regulatory infrastructure program rate(c)
üüüü
Bad debt rider(d)
üüü
Energy efficiency plan(e)
üü
Annual base rate adjustment mechanism(f)
üü
Year of last base rate case decision2023201920232018
(a)Designed to help stabilize operating results by allowing recovery of costs in the event of unseasonal weather, but are not direct offsets to the potential impacts on earnings of weather and customer consumption.
(b)Allows for recovery of fixed customer service costs separately from assumed natural gas volumes used by customers and provides a benchmark level of revenue for recovery.
(c)See "Infrastructure Replacement Programs and Capital Projects" herein for additional information. Chattanooga Gas' pipeline replacement program costs are recovered through its annual base rate review mechanism.
(d)The recovery (refund) of bad debt expense over (under) an established benchmark expense. The gas portion of bad debt expense is recovered through purchased gas adjustment mechanisms. Nicor Gas also has a rider to recover the non-gas portion of bad debt expense.
(e)Recovery of costs associated with plans to achieve specified energy savings goals.
(f)Regulatory mechanism allowing annual adjustments to base rates up or down based on authorized ROE and/or ROE range.
Infrastructure Replacement Programs and Capital Projects
In addition to capital expenditures recovered through base rates by each of the natural gas distribution utilities, Nicor Gas and Virginia Natural Gas have separate rate riders that provide timely recovery of capital expenditures for specific infrastructure replacement programs and Atlanta Gas Light has a separate ongoing matter.rate rider that provides for the timely recovery of capital expenditures for a specific reinforcement capital program. Total capital expenditures incurred during 2023 for all gas distribution operations were $1.6 billion.
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The following table and discussions provide updates on the infrastructure replacement programs and capital projects at the natural gas distribution utilities at December 31, 2023. These programs are risk-based and designed to update and replace cast iron, bare steel, and mid-vintage plastic materials or expand Southern Company Gas' distribution systems to improve reliability and meet operational flexibility and growth.
UtilityProgramRecoveryCapital Expenditures in 2023Capital Expenditures Since Project InceptionPipe
Installed Since
Project Inception
Scope of
Program
Program DurationLast
Year of Program
(in millions)(miles)(miles)(years)
Nicor Gas
Investing in Illinois Qualifying Infrastructure Plant(*)
Rider$365 $3,228 1,367 1,367 92023
Virginia Natural GasSAVERider75 486 567 695 132024
Atlanta Gas LightSystem Reinforcement RiderRider104 180 20 N/A32024
Chattanooga GasPipeline Replacement ProgramRate Base16 15 73 72027
Total$553 $3,910 1,969 2,135 
(*)Included replacement of pipes, compressors, and transmission mains along with other improvements such as new meters. This program ended November 30, 2023 with all expenditures placed in service. Recovery of program costs is described under "Nicor Gas" herein.
Nicor Gas
Illinois legislation allows Nicor Gas to provide more widespread safety and reliability enhancements to its distribution system through 2023 and stipulates that rate increases to customers as a result of any infrastructure investments shall not exceed a cumulative annual average of 4.0% or, in any given year, 5.5% of base rate revenues. In 2014, the Illinois Commission approved the nine-year regulatory infrastructure program, Investing in Illinois, which concluded in 2023 and is subject to annual review, as discussed further below. In accordance with orders from the Illinois Commission, Nicor Gas recovers program costs incurred through a separate rider and base rates. See "Rate Proceedings – Nicor Gas" herein for additional information.
On October 25, 2017,June 15, 2023, the FERC issuedIllinois Commission concluded its review of the Qualifying Infrastructure Plant (QIP) capital investments by Nicor Gas for calendar year 2019 under the QIP rider, also referred to as Investing in Illinois program. The Illinois Commission disallowed $32 million of the $415 million of capital investments commissioned in 2019, together with the related return on investment. Nicor Gas recorded a pre-tax charge to income in the second quarter 2023 of $38 million ($28 million after tax) associated with the disallowance of capital investments placed in service in 2019. The disallowance is reflected on the statement of income as an order$8 million reduction to revenues and $30 million in responseestimated loss on regulatory disallowance. On August 3, 2023, the Illinois Commission denied a rehearing request filed by Nicor Gas. On August 24, 2023, Nicor Gas filed a notice of appeal with the Illinois Appellate Court. Nicor Gas defends these investments in infrastructure as prudently incurred.
The following table provides a summary of QIP capital investments during the nine-year program:
Year Status of QIP Annual Review ProceedingCapital InvestmentsDisallowedMonth of Disallowance
(in millions)
2015 – 2018Complete$1,246 $— 
2019
Complete(a)
415 32 June 2023
2020Filed March 2021402 (b)
2021Filed March 2022392 (b)
2022Filed March 2023408 (b)(a)(c)November 2023
2023To be filed by March 20, 2024365 (b)25 (a)(c)November 2023
$3,228 $63 
(a)Appealed to the traditional electric operating companies' (including the Company's) and Southern Power's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies (including the Company) and Southern Power to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacentIllinois Appellate Court.
(b)Capital investments are subject to the area presently under mitigation in accordancerequired QIP annual review proceeding; years 2020 through 2022 are pending with the February 2, 2017 order or to provide a mitigation plan toIllinois Commission.
(c)Disallowed in Nicor Gas' 2023 general base rate case proceeding. See "Rate Proceedings – Nicor Gas" herein for additional information regarding the Illinois Commission's disallowance of certain capital investments.
Any further address market power concerns. On November 10, 2017,cost disallowances by the traditional electric operating companies (includingIllinois Commission in the Company) and Southern Power respondedpending cases could be material to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subjectfinancial statements of the October 25, 2017 order.
Southern Company Gas. The ultimate outcome of these matters cannot be determined at this time.
Cooperative Energy Power Supply Agreement
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In 2008,
COMBINED NOTES TO FINANCIAL STATEMENTS

Virginia Natural Gas
The SAVE program, an accelerated infrastructure replacement program, allows Virginia Natural Gas to continue replacing aging pipeline infrastructure through 2024. The program includes authorized annual investments of $60 million in 2021 and $70 million in each year from 2022 through 2024, with a total potential variance of up to $5 million allowed for the Company entered intoprogram, for a 10-year Power Supply Agreement (PSA)maximum total investment over the six-year term (2019 through 2024) of $365 million.
On February 9, 2024, Virginia Natural Gas filed with Cooperative Energy for approximately 152 MWs, which became effective in 2011. Following certain plant retirements, the PSA capacity was reduced to 86 MWs. On February 5, 2018, the Company and Cooperative Energy executed an amendmentVirginia Commission a request to extend the PSAexisting SAVE program through March 31, 2021, effective April 1, 2018,2029. The request includes investments of $70 million in each year from 2025 through 2029, with increased total capacitya potential variance of 286 MWs.
Cooperative Energy also has a 10-year Network Integration Transmission Service Agreement (NITSA) with SCS for transmission serviceup to certain delivery points on the Company's transmission system that became effective in 2011. As a result of the PSA amendments, Cooperative Energy and SCS amended the terms of the NITSA on January 12, 2018 to provide$5 million allowed for the purchaseprogram, for a maximum total investment over the five-year extension (2025 through 2029) of incremental transmission capacity for service beginning April 1, 2018 through March 31, 2021. This NITSA amendment remains subject$355 million. Virginia Natural Gas expects the Virginia Commission to acceptance byissue a final order on this matter in the FERC.second quarter 2024. The ultimate outcome of these mattersthis matter cannot be determined at this time.
Retail Regulatory Matters
General
In 2012, the Mississippi PSC issued an order for the purpose of investigating and reviewing, for informational purposes only, the ROE formulas usedThe SAVE program is subject to annual review by the Company and all other regulated electric utilities in Mississippi.Virginia Commission. In 2013, the MPUS filedaccordance with the Mississippi PSC its report on the ROE formulas usedbase rate case approved by the Company and all other regulated electric utilitiesVirginia Commission in Mississippi.
In 2014, the Mississippi PSC issued an order for the purpose of investigating and reviewing the adoption of2023, Virginia Natural Gas is recovering program costs incurred prior to January 1, 2023 through base rates. Program costs incurred subsequent to January 1, 2023 are currently being recovered through a uniform formula rate plan for the Company and other regulated electric utilities in Mississippi.
On January 26, 2018, the Mississippi PSC issued an order directing utilities to file within 30 days information regarding the impact on rates resulting from Tax Reform Legislation. The Company's Kemper County energy facility rates, approved on February 6, 2018, include the effects of Tax Reform Legislation. The Company's 2018 ECO, revised 2018 PEP, and 2018 SRR rate filings, all submitted in February 2018, include the effects of Tax Reform Legislationseparate rider and are subject to approvalfuture base rate case proceedings. See "Rate Proceedings – Virginia Natural Gas" herein for additional information.
Atlanta Gas Light
In 2019, the Georgia PSC approved the continuation of GRAM as part of Atlanta Gas Light's 2019 rate case order. Various infrastructure programs previously authorized by the Mississippi PSC.
Georgia PSC, including the Integrated Vintage Plastic Replacement Program to replace aging plastic pipe and the Integrated System Reinforcement Program to upgrade Atlanta Gas Light's distribution system and LNG facilities in Georgia, continue under GRAM and the recovery of and return on the infrastructure program investments are included in annual base rate adjustments. The ultimate outcome of these matters cannotamounts to be determined at this time.
Performance Evaluation Plan
The Company's retailrecovered through rates related to allowed, but not incurred, costs have been quantified as an unrecognized ratemaking amount that is not reflected on the balance sheets. These allowed costs are primarily the equity return on the capital investment under the infrastructure programs in place prior to GRAM and are being recovered through GRAM and base rates are setuntil the earlier of the full recovery of such amounts or December 31, 2025. The under recovered balance at December 31, 2023 was $44 million, including $23 million of unrecognized equity return, and is expected to be recovered by December 31, 2025. The Georgia PSC reviews Atlanta Gas Light's performance annually under GRAM. See "Unrecognized Ratemaking Amounts" herein for additional information.
Atlanta Gas Light and the PEP,staff of the Georgia PSC previously agreed to a rate planvariation of the Integrated Customer Growth Program to extend pipeline facilities to serve customers in areas without pipeline access and create new economic development opportunities in Georgia. A separate tariff provides recovery of up to $15 million annually for strategic economic development projects approved by the MississippiGeorgia PSC. Two filings are made
See "Rate Proceedings – Atlanta Gas Light" herein for each calendar year:additional information regarding the PEP projectedGeorgia PSC's 2021 approval of Atlanta Gas Light's GRAM filing and Integrated Capacity and Delivery Plan. The Georgia PSC also approved a new System Reinforcement Rider for authorized large pressure improvement and system reliability projects, which is typically filed priorexpected to recover related capital investments totaling $286 million for the years 2022 through 2024, of which $104 million and $76 million was incurred in 2023 and 2022, respectively.
Chattanooga Gas
In 2021, the Tennessee Public Utilities Commission approved Chattanooga Gas' pipeline replacement program to replace approximately 73 miles of distribution main over a seven-year period. The estimated total cost of the program is $118 million, which will be recovered through Chattanooga Gas' annual base rate review mechanism.
Natural Gas Cost Recovery
With the exception of Atlanta Gas Light, the natural gas distribution utilities are authorized by the relevant regulatory agencies in the states in which they serve to use natural gas cost recovery mechanisms that adjust rates to reflect changes in the wholesale cost of natural gas and ensure recovery of all costs prudently incurred in purchasing natural gas for customers. The natural gas distribution utilities defer or accrue the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the beginning ofcommodity rate. Deferred natural gas costs are reflected as regulatory assets and accrued natural gas costs are reflected as regulatory liabilities. Natural gas costs generally do not have a significant effect on Southern Company's or Southern Company Gas' net income, but could have a significant effect on cash flows. Since Atlanta Gas Light does not sell natural gas directly to its end-use customers, it does not utilize a traditional natural gas cost recovery mechanism. However, Atlanta Gas Light does maintain natural gas inventory for the year based on a projected revenue requirement,Marketers in Georgia and recovers the PEP lookback filing,cost through recovery mechanisms approved by the Georgia PSC. At December 31, 2023, the over recovered balance was $214 million, which is filed after the end of the year and allows for review of the actual revenue requirement compared to the projected filing.
In 2011, the Company submitted its annual PEP lookback filing for 2010, which recommended no surcharge or refund. Laterwas included in 2011, the MPUS disputed certain items in the 2010 PEP lookback filing. In 2012, the Mississippi PSC issued an order canceling the Company's PEP lookback filing for 2011. In 2013, the MPUS contested the Company's PEP lookback filing for 2012, which indicated a refund due to customers of $5 million. Unresolved matters related to the 2010 PEP lookback filing, which remain under review, also impact the 2012 PEP lookback filing.
In 2013, the Mississippi PSC approved the projected PEP filing for 2013, which resulted in a rate increase of 1.9%, or $15 million, annually, effective March 19, 2013. The Company may be entitled to $3 million in additional revenues related to 2013 as a result of the late implementation of the 2013 PEP rate increase.
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Mississippi Power Company 2017 Annual Report

natural gas cost over recovery on Southern Company's and Southern Company Gas' balance sheets. At December 31, 2022, the under recovered balance was $108 million, which was included in natural gas cost under recovery on Southern Company's and Southern Company Gas' balance sheets.
Rate Proceedings
Nicor Gas
In 2014, 2015, 2016, and 2017,2021, the Company submitted itsIllinois Commission approved a $240 million annual PEP lookback filings for the prior years, which for 2013 and 2014 each indicated no surcharge or refund and for each of 2015 and 2016 indicated a $5 million surcharge. Additionally, in July 2016, in November 2016, and on November 15, 2017, the Company submitted its annual projected PEP filings for 2016, 2017, and 2018, respectively, which for 2016 and 2017 indicated no change in rates and for 2018 indicated abase rate increase, which became effective November 24, 2021. The base rate increase included $94 million related to the recovery of 4%, or $38 millionprogram costs under the Investing in annual revenues. The Mississippi PSC suspended each of these filings to allow more time for review.
On February 7, 2018, the Company revised its annual projected PEP filing for 2018 to reflect the impacts of Tax Reform Legislation. The revised filing requests an increase of $26 million in annual revenues,Illinois program and was based on a performance adjusted ROE of 9.33%9.75% and an increased equity ratio of 55%54.5%.
On November 16, 2023, the Illinois Commission approved a $223 million annual base rate increase for Nicor Gas, which became effective December 1, 2023. The base rate increase was based on a return on equity of 9.51% and an equity ratio of 50.00%.
In connection with Nicor Gas' general base rate case proceeding, the Illinois Commission disallowed $126.8 million of capital investments that have been completed or planned to be completed through December 31, 2024. This includes $31 million for capital investments placed in service in 2022 and 2023 under the Investing in Illinois program and $95.9 million for other transmission and distribution capital investments. Nicor Gas recorded a pre-tax charge to income in the fourth quarter 2023 of $58 million ($44 million after tax) associated with the disallowances, with the remaining $69 million related to prospective projects that will be postponed and/or reevaluated. The disallowance is reflected on the statement of income in estimated loss on regulatory disallowance. See Note 5"Infrastructure Replacement Programs and Capital Projects – Nicor Gas" herein for additional information.
The ultimate outcomeinformation regarding the Illinois Commission's disallowance of these matters cannot becertain capital investments. On January 3, 2024, the Illinois Commission denied a request by Nicor Gas for rehearing on the base rate case disallowances associated with capital investment, as well as on other issues determined at this time.
Energy Efficiency
In 2013,in the Mississippi PSC approved an energy efficiency and conservation rule requiring electric and gas utilities in Mississippi serving more than 25,000 customersIllinois Commission's November 16, 2023 base rate case decision. On February 6, 2024, Nicor Gas filed a notice of appeal with the Illinois Appellate Court related to implement energy efficiency programs and standards. Quick Start Plans, which include a portfolio of energy efficiency programs that are intended to provide benefits to a majority of customers, were extended by an order issued by the Mississippi PSC in July 2016, until the time the Mississippi PSC approves a comprehensive portfolio plan program.Illinois Commission's rate case ruling. The ultimate outcome of this matter cannot be determined at this time.
On July 6, 2017,Atlanta Gas Light
The Georgia PSC evaluates Atlanta Gas Light's earnings against a ROE range of 10.05% to 10.45%, with disposition of any earnings above 10.45% to be determined by the MississippiGeorgia PSC. Additionally, the Georgia PSC issuedallows inclusion in base rates of the recovery of and return on the infrastructure program investments, including, but not limited to, GRAM adjustments. GRAM filing rate adjustments are based on an order approving the Company's Energy Efficiency Cost Rider 2017 compliance filing, which increased annual retail revenuesauthorized ROE of 10.25%. GRAM adjustments for 2021 could not exceed 5% of 2020 base rates. The 5% limitation does not set a precedent in any future rate proceedings by approximately $2 million effectiveAtlanta Gas Light.
In April 2021, Atlanta Gas Light filed its Integrated Capacity and Delivery Plan (i-CDP) with the first billing cycle for August 2017.
On November 30, 2017, the Company submitted its Energy Efficiency Cost Rider 2018 compliance filingGeorgia PSC, which included a small decreaseseries of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2022 through 2031), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected capital investments totaling approximately $0.5 billion to $0.6 billion annually.
In November 2021, the Georgia PSC approved a stipulation agreement between Atlanta Gas Light and the staff of the Georgia PSC, under which, for the years 2022 through 2024, Atlanta Gas Light will incrementally reduce its combined GRAM and System Reinforcement Rider request by 10% through Atlanta Gas Light's GRAM mechanism, which resulted in a reduction of $5 million for 2022, $7 million for 2023, and $9 million for 2024. The stipulation agreement also provided for $1.7 billion of total capital investment for the years 2022 through 2024.
In November 2021, December 2022, and December 2023, the Georgia PSC approved Atlanta Gas Light's annual retail revenues.GRAM filings, which resulted in an annual rate increase of $43 million effective January 1, 2022, an annual rate increase of $53 million effective January 1, 2023, and an annual rate increase of $53 million effective January 1, 2024, respectively.
On February 1, 2024, Atlanta Gas Light filed its triennial i-CDP with the Georgia PSC, which included a series of ongoing and proposed pipeline safety, reliability, and growth programs for the next 10 years (2025 through 2034), as well as the required capital investments and related costs to implement the programs. The i-CDP reflected capital investments totaling approximately
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$0.7 billion to $1.0 billion annually. Atlanta Gas Light expects the Georgia PSC to issue a final order on this matter in the third quarter 2024. The ultimate outcome of this matter cannot be determined at this time.
Environmental Compliance Overview PlanVirginia Natural Gas
In 2012,2021, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' 2020 general rate case filing, which allowed for a $43 million increase in annual base rate revenues, including $14 million related to the recovery of investments under the SAVE program, based on a ROE of 9.5% and an equity ratio of 51.9%. Interim rates became effective as of November 1, 2020, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $50 million. Refunds to customers related to the difference between the approved rates effective October 1, 2021 and the interim rates were completed during the fourth quarter 2021.
On August 28, 2023, the Virginia Commission approved a stipulation agreement related to Virginia Natural Gas' August 2022 general base rate case filing, which allowed for a $48 million increase in annual base rate revenues based on a ROE of 9.70% and an equity ratio of 49.06%. Interim rates became effective as of January 1, 2023, subject to refund, based on Virginia Natural Gas' original requested increase of approximately $69 million. Refunds to customers related to the difference between the approved rates effective September 1, 2023 and the interim rates were completed during the fourth quarter 2023.
Unrecognized Ratemaking Amounts
The following table illustrates Southern Company Gas' authorized ratemaking amounts that are not recognized on its balance sheets. These amounts are primarily comprised of an allowed equity rate of return on assets associated with certain regulatory infrastructure programs. These amounts will be recognized as revenues in Southern Company Gas' financial statements in the periods they are billable to customers, the majority of which will be recovered by 2025.
December 31, 2023December 31, 2022
(in millions)
Atlanta Gas Light$23 $35 
Virginia Natural Gas10 10 
Chattanooga Gas7 
Nicor Gas3 
Total$43 $50 
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3. CONTINGENCIES, COMMITMENTS, AND GUARANTEES
General Litigation Matters
The Registrants are involved in various matters being litigated and regulatory matters. The ultimate outcome of such pending or potential litigation or regulatory matters against each Registrant and any subsidiaries cannot be determined at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on such Registrant's financial statements.
The Registrants intend to dispute the allegations raised in and vigorously defend against the pending legal challenges discussed below; however, the ultimate outcome of these matters cannot be determined at this time.
Southern Company and Mississippi PSC approvedPower
In 2010, the Company'sDOE, through a cooperative agreement with SCS, agreed to fund $270 million of the Kemper County energy facility through the grants awarded to the project by the DOE under the Clean Coal Power Initiative Round 2. In 2016, additional DOE grants in the amount of $137 million were awarded to the Kemper County energy facility. In 2018, Mississippi Power filed with the DOE its request for a CPCNproperty closeout certification under the contract related to construct scrubbers on Plant Daniel Units 1the $387 million of total grants received. In 2020, Mississippi Power and 2, which were placed in service in 2015. These units are jointly owned by theSouthern Company and Gulf Power, with 50% ownership each. In 2014, the Company entered into a settlementexecuted an agreement with the Sierra Club underDOE completing Mississippi Power's request, which enabled Mississippi Power to proceed with full dismantlement of the abandoned gasifier-related assets and site restoration activities. In connection with the DOE closeout discussions, in 2019, the Civil Division of the Department of Justice informed Southern Company and Mississippi Power of a civil investigation related to the DOE grants. On August 4, 2023, the U.S. District Court for the Northern District of Georgia unsealed a civil action in which defendants Southern Company, SCS, and Mississippi Power are alleged to have violated certain provisions of the False Claims Act by fraudulently inducing the DOE to disburse funds pursuant to the grants. The federal government declined to intervene in the action. On October 30, 2023, the plaintiff, a former SCS employee, filed an amended complaint, again alleging certain violations of the False Claims Act. The plaintiff seeks to recover all damages incurred personally and on behalf of the government caused by the defendants' alleged violations, as well as treble damages and attorneys' fees, among other things, the Company agreed to retire, repower with natural gas, or convert torelief. The ultimate outcome of this matter cannot be determined at this time; however, an alternative non-fossil fuel source Plant Sweatt Units 1 and 2 (80 MWs) no later than December 2018 (and the units were retired in July 2016). The Company also agreed that it would cease burning coal and other solid fuel at Plant Watson Units 4 and 5 (750 MWs) and begin operating those units solely on natural gas no later than April 2015 (which occurred in April 2015) and cease burning coal and other solid fuel at Plant Greene County Units 1 and 2 (200 MWs) no later than April 2016 (which occurred in February and March 2016, respectively) and begin operating those units solely on natural gas (which occurred in June and July 2016, respectively).
In accordance with a 2011 accounting order from the Mississippi PSC, the Company has the authority to defer in a regulatory asset for future recovery all plant retirement- or partial retirement-related costs resulting from environmental regulations. The Mississippi PSC approved $41 million and $17 million of costs that were reclassified to regulatory assets associated with Plant Watson and Plant Greene County, respectively, for amortization over five-year periods that began in July 2016 and July 2017, respectively. As a result, these decisions are not expected toadverse outcome could have a material impact on theSouthern Company's and Mississippi Power's financial statements.
Alabama Power
In August 2016,September 2022, Mobile Baykeeper filed a citizen suit in the U.S. District Court for the Southern District of Alabama alleging that Alabama Power's plan to close the Plant Barry ash pond utilizing a closure-in-place methodology violates the Resource Conservation and Recovery Act (RCRA) and regulations governing CCR. Among other relief requested, Mobile Baykeeper sought a declaratory judgment that the RCRA and regulations governing CCR were being violated, preliminary and injunctive relief to prevent implementation of Alabama Power's closure plan and the development of a closure plan that satisfies regulations governing CCR requirements. In December 2022, Alabama Power filed a motion to dismiss the case. On January 4, 2024, the lawsuit was dismissed without prejudice by the U.S. District Court judge. On February 1, 2024, the plaintiff filed a motion to reconsider.
On January 31, 2023, the EPA issued a Notice of Potential Violations associated with Alabama Power's plan to close the Plant Barry ash pond. Alabama Power has affirmed to the EPA its position that it is in compliance with CCR requirements. The ultimate outcome of this matter cannot be determined at this time but could have a material impact on Alabama Power's ARO estimates and cash flows.
See Note 6 for a discussion of Alabama Power's ARO liabilities.
Georgia Power
In July 2020, a group of individual plaintiffs filed a complaint, which was amended in December 2022, in the Superior Court of Fulton County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer has impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages, a medical monitoring fund, and injunctive relief. In December 2022, the Superior Court of Fulton County, Georgia granted Georgia Power's motion to transfer the case to the Superior Court of Monroe County, Georgia. On May 9, 2023, the Superior Court of Monroe County, Georgia denied Georgia Power's motion to dismiss the case for lack of subject matter jurisdiction. On July 27, 2023, the Superior Court of Monroe County, Georgia denied the remaining motions to dismiss certain claims and plaintiffs that Georgia Power filed at the outset of the case.
In October 2021, February 2022, and January 2023, a total of eight additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that releases from Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs sought an unspecified amount of monetary damages
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including punitive damages. After Georgia Power removed these cases to the U.S. District Court for the Middle District of Georgia, the plaintiffs voluntarily dismissed their complaints without prejudice in November 2022 and January 2023. On May 12, 2023, the plaintiffs in the cases originally filed in October 2021, February 2022, and January 2023 refiled their eight complaints in the Superior Court of Monroe County, Georgia. Also on May 12, 2023, a new complaint was filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries. The plaintiff seeks an unspecified amount of monetary damages, including punitive damages. On May 18, 2023, Georgia Power removed all of these cases to the U.S. District Court for the Middle District of Georgia. The plaintiffs are requesting the court remand the cases back to the Superior Court of Monroe County, Georgia.
The amount of possible loss, if any, from these matters cannot be estimated at this time.
Mississippi Power
In 2018, Ray C. Turnage and 10 other individual plaintiffs filed a putative class action complaint against Mississippi Power and the three then-serving members of the Mississippi PSC in the U.S. District Court for the Southern District of Mississippi, which was amended in March 2019 to include four additional plaintiffs. Mississippi Power received Mississippi PSC approval in 2013 to charge a mirror CWIP rate premised upon including in its rate base pre-construction and construction costs for the Kemper IGCC prior to placing the Kemper IGCC into service. The Mississippi Supreme Court reversed that approval and ordered Mississippi Power to refund the amounts paid by customers under the previously-approved mirror CWIP rate. The plaintiffs allege that the initial approval process, and the amount approved, were improper and make claims for gross negligence, reckless conduct, and intentional wrongdoing. They also allege that Mississippi Power underpaid customers by up to $23.5 million in the Company'srefund process by applying an incorrect interest rate. The plaintiffs seek to recover, on behalf of themselves and their putative class, actual damages, punitive damages, pre-judgment interest, post-judgment interest, attorney's fees, and costs. The district court dismissed the amended complaint; however, in March 2020, the plaintiffs filed a motion seeking to name the new members of the Mississippi PSC, the Mississippi Development Authority, and Southern Company as additional defendants and add a cause of action against all defendants based on a dormant commerce clause theory under the U.S. Constitution. In July 2020, the plaintiffs filed a motion for leave to file a third amended complaint, which included the same federal claims as the proposed second amended complaint, as well as several additional state law claims based on the allegation that Mississippi Power failed to disclose the annual percentage rate of interest applicable to refunds. In November 2020, the district court denied each of the plaintiffs' pending motions and entered final judgment in favor of Mississippi Power. In January 2021, the district court denied further motions by the plaintiffs to vacate the judgment and to file a revised ECO plan filingsecond amended complaint. In February 2021, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for 2016,the Fifth Circuit. In March 2022, the U.S. Court of Appeals for the Fifth Circuit issued an opinion affirming the dismissal of the claims against the Mississippi PSC defendants but reversing the dismissal of the claims against Mississippi Power. In May 2022, the U.S. Court of Appeals for the Fifth Circuit denied a petition by Mississippi Power for a rehearing en banc and remanded the case to the U.S. District Court for the Southern District of Mississippi for further proceedings. In June 2022, Mississippi Power filed with the trial court a motion to dismiss the complaint with prejudice, which requestedwas granted on March 15, 2023. On March 28, 2023, the maximum 2% annualplaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fifth Circuit. On December 14, 2023, the U.S. Court of Appeals for the Fifth Circuit affirmed the district court's order dismissing the plaintiffs' complaint against Mississippi Power. On December 28, 2023, the plaintiffs filed a petition for panel rehearing, which was denied on January 10, 2024. The plaintiffs have until April 9, 2024 to file a petition for writ of certiorari with the U.S. Supreme Court. The ultimate outcome of this matter cannot be determined at this time.
Southern Power
In July 2021, Southern Power and certain of its subsidiaries filed an arbitration demand with the American Arbitration Association against First Solar Electric, LLC (First Solar) for defective design of actuators on trackers and inverters installed by First Solar under the engineering, procurement, and construction agreements associated with five solar projects owned by Southern Power and partners and managed by Southern Power. In February 2023, arbitration hearings concluded. In July 2023, an interim award of approximately $36 million was entered in favor of Southern Power and was subsequently received in September 2023. The interim award included $18 million representing recovery of losses associated with replacement costs, penalty payments, and lost revenues previously incurred. This recovery is reflected in Southern Power's 2023 statement of income as an $11 million reduction to other operations and maintenance expense and a $7 million increase in other revenues, or approximatelywith $6 million allocated through noncontrolling interests to Southern Power's partners. The remaining $18 million primarily related to the Plant Daniel Units 1 and 2 scrubbers placed in service in 2015. The revised rates became effective with the first billing cycle for September 2016. Approximately $22 million of related revenue requirementsaward proceeds received in excess of the 2% maximumlosses incurred is recognized on the balance sheet at December 31, 2023 as restricted cash and a liability to fund future replacement costs. In November 2023, the final award was deferredissued and Southern Power filed for inclusionconfirmation of the final award in the 2017 filing, along with related carrying costs.
On May 4, 2017,Delaware Court of Chancery. In December 2023, First Solar filed a motion to dismiss the Mississippi PSC approvedconfirmation and, in February 2024, filed a petition to vacate the Company's ECO plan filing for 2017, which requested the maximum 2% annual increase in revenues, or approximately $18 million, primarily related to the carryforward from the prior year. The rates became effective with the first billing cycle for June 2017. Approximately $26 million of related revenue requirements in excess of the 2% maximum was deferred for inclusionarbitration award in the 2018 filing, along with related carrying costs.
On February 14, 2018, the Company submitted its ECO plan filing for 2018, including the effectsSupreme Court of Tax Reform Legislation, which requested the maximum 2% annual increase in revenues, or approximately $17 million, primarily related to the carryforward from the prior year. Approximately $13 million of related revenue requirements in excess of the 2% maximum, along with related carrying costs, remains deferred for inclusion in the 2019 filing.New York County, New York. The ultimate outcome of this matter cannot be determined at this time.
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Fuel Cost RecoveryEnvironmental Remediation
The Southern Company establishes,system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and the natural gas distribution utilities conduct studies to determine the extent of any required cleanup and have recognized the estimated costs to clean up known impacted sites in the financial statements. A liability for environmental remediation costs is recognized only when a loss is determined to be probable and reasonably estimable and is reduced as expenditures are incurred. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia have each received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. Any difference between the liabilities accrued and costs recovered through rates is deferred as a regulatory asset or liability. These regulatory mechanisms are adjusted annually a retail fuel cost recovery factor that isor as necessary within limits approved by the Mississippi PSC. Thestate PSCs or other applicable state regulatory agencies.
Georgia Power has been designated or identified as a potentially responsible party at sites governed by the Georgia Hazardous Site Response Act and/or by the federal Comprehensive Environmental Response, Compensation, and Liability Act, and assessment and potential cleanup of such sites is expected. For 2023, 2022, and 2021, Georgia Power recovered approximately $5 million, $12 million, and $12 million, respectively, through the ECCR tariff for environmental remediation.
Southern Company Gas is requiredsubject to file for an adjustment toenvironmental remediation liabilities associated with 40 former manufactured gas plant sites in four different states. Southern Company Gas' accrued environmental remediation liability at December 31, 2023 and 2022 was based on the retail fuelestimated cost recovery factor annually. On January 12, 2017, the Mississippi PSC approved the 2017 retail fuel cost recovery factor, effective February 2017 through January 2018, which resulted in an annual revenue increase of approximately $55 million. On November 15, 2017, the Company filed its annual rate adjustment under the retail fuel cost recovery clause, requesting an additional increase of $39 million annually, which the Mississippi PSC approved on January 16, 2018 effective February 2018 through January 2019. environmental investigation and remediation associated with these sites.
At December 31, 2017,2023 and 2022, the amountenvironmental remediation liability and the balance of under-recovered retail fuelunder recovered environmental remediation costs includedwere reflected in the balance sheetsheets of Southern Company, Georgia Power, and Southern Company Gas as shown in customer accounts receivable was approximately $6 million compared to $37 million over recoveredthe table below. Alabama Power and Mississippi Power did not have environmental remediation liabilities at December 31, 2016.2023 or 2022.
The Company's operating revenues are adjusted for differences in actual recoverable fuel cost and amounts billed in accordance with the currently approved cost recovery rate. Accordingly, changes in the billing factor should have no significant effect on the Company's revenues or net income, but will affect cash flow.
Ad Valorem Tax Adjustment
The Company establishes, annually, an ad valorem tax adjustment factor that is approved by the Mississippi PSC to collect the ad valorem taxes paid by the Company. On July 6, 2017, the Mississippi PSC approved the Company's annual ad valorem tax adjustment factor filing for 2017, which included an annual rate increase of 0.85%, or $8 million in annual retail revenues, primarily due to increased assessments.
System Restoration Rider
In February 2016, the Company submitted its 2016 SRR rate filing which proposed no changes to either the SRR rate or the annual property damage reserve accrual of $3 million annually. On February 3, 2017, the Company submitted its 2017 SRR rate filing, which proposed an increase in the property damage reserve accrual of $1 million. These filings were suspended by the Mississippi PSC for review.
On January 21, 2017, a tornado caused extensive damage to the Company's transmission and distribution infrastructure. Storm damage repairs were approximately $9 million. A portion of these costs was charged to the retail property damage reserve and was addressed in the 2018 SRR rate filing.
On February 1, 2018, the Company submitted its 2018 SRR rate filing, including the effects of Tax Reform Legislation, which proposed that the SRR rate remain at zero and the annual accrual for the property damage reserve be reduced to $2 million in 2018.
Southern CompanyGeorgia
Power
Southern Company Gas
(in millions)
December 31, 2023:
Environmental remediation liability:
Other current liabilities$44 $14 $30 
Accrued environmental remediation192 — 192 
Under recovered environmental remediation costs:
Other regulatory assets, current$45 $$40 
Other regulatory assets, deferred210 15 195 
December 31, 2022:
Environmental remediation liability:
Other current liabilities$65 $15 $49 
Accrued environmental remediation207 — 207 
Under recovered environmental remediation costs:
Other regulatory assets, current$59 $$54 
Other regulatory assets, deferred235 20 215 
The ultimate outcome of these matters cannot be determined at this time. See Note 1 under "Provisiontime; however, as a result of the regulatory treatment for Property Damage" for additional information.
Storm Damage Cost Recovery
In connection withenvironmental remediation expenses described above, the damage associated with Hurricane Katrina,final disposition of these matters is not expected to have a material impact on the Mississippi PSC authorized the issuancefinancial statements of system restoration bonds in 2006. In accordance with a Mississippi PSC order on January 24, 2017, the Company eliminated the applicable Storm Restoration Charge becauseRegistrants.
Nuclear Fuel Disposal Costs
Acting through the bond sinking fund managed by the Mississippi State Bond Commission is substantially funded.
Kemper County Energy Facility
Overview
The Kemper County energy facility was designed to utilize IGCC technology with an expected output capacity of 582 MWsDOE and to be fueled by locally mined lignite (an abundant, lower heating value coal) from a mine owned by the Company and situated adjacentpursuant to the Kemper County energy facility.Nuclear Waste Policy Act of 1982, the U.S. government entered into contracts with Alabama Power and Georgia Power that required the DOE to take title to and dispose of spent nuclear fuel generated at Plants Farley, Hatch, and Vogtle Units 1 and 2 beginning no later than January 31, 1998. The mine, operated by North American Coal Corporation, started commercial operation in 2013. In connection with the Kemper County energy facility construction, the Company constructed approximately 61 milesDOE has yet to commence performance of CO2 pipeline infrastructure for the transport of captured CO2 for use in enhanced oil recovery.
Schedule and Cost Estimate
In 2012, the Mississippi PSC issued the 2012 MPSC CPCN Order, confirming the CPCN originally approved by the Mississippi PSC in 2010 authorizing the acquisition, construction, and operation of the Kemper County energy facility. The certificated cost estimate of the Kemper County energy facility included in the 2012 MPSC CPCN Order was $2.4 billion, net of approximately $0.57 billion for the cost of the lignite mine and equipment, the cost of the CO2 pipeline facilities, AFUDC, and certain general
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exceptions (Cost Cap Exceptions). The 2012 MPSC CPCN Order approved a construction cost cap of up to $2.88 billion, with recovery of prudently-incurred costs subject to approval by the Mississippi PSC. The Kemper County energy facility was originally projected to be placed in service in May 2014. The Company placed the combined cycleits contractual and the associated common facilities portion of the Kemper County energy facility in service in August 2014.
The initial production of syngas began on July 14, 2016 for gasifier "B" and on September 13, 2016 for gasifier "A." The Company achieved integrated operation of both gasifiers on January 29, 2017, including the production of electricity from syngas in both combustion turbines. During testing, the plant produced and captured CO2, and produced sulfuric acid and ammonia, each of acceptable quality under the related off-take agreements. However, the Company experienced numerous challenges during the extended start-up process to achieve integrated operation of the gasifiers on a sustained basis. In May 2017, after achieving these milestones, the Company determined that a critical system component, the syngas coolers, would need replacement sooner than originally planned, which would require significant lead time and significant cost. In addition, the long-term natural gas price forecast had decreased significantly and the estimated cost of operating and maintaining the facility during the first five full years of operations had increased significantly since certification.
On June 21, 2017, the Mississippi PSC stated its intent to issue an order (which occurred on July 6, 2017) directing the Company to pursue a settlement under which the Kemper County energy facility would be operated as a natural gas plant, rather than an IGCC plant, and address all issues associated with the Kemper County energy facility (Kemper Settlement Order). The Kemper Settlement Order established a new docket for the purposes of pursuing a global settlement of the related costs (Kemper Settlement Docket). On June 28, 2017, the Company notified the Mississippi PSC that it would begin a process to suspend operations and start-up activities on the gasifier portion of the Kemper County energy facility, given the uncertainty as to its future. On February 6, 2018, the Mississippi PSC voted to approve a settlement agreement related to cost recovery for the Kemper County energy facility among the Company, the MPUS, and certain intervenors (Kemper Settlement Agreement).
At the time of project suspension in June 2017, the total cost estimate for the Kemper County energy facility was approximately $7.38 billion, including approximately $5.95 billion of costs subject to the construction cost cap, and was net of the $137 million in Additional DOE Grants. In the aggregate, the Company had recorded charges to income of $3.07 billion ($1.89 billion after tax) as a result of changes in the cost estimate above the cost cap for the Kemper IGCC through May 31, 2017.
Given the Mississippi PSC's stated intent regarding no further rate increase for the Kemper County energy facility and the subsequent suspension, cost recovery of the gasifier portions became no longer probable; therefore, the Company recorded an additional charge to income in June 2017 of $2.8 billion ($2.0 billion after tax), which included estimated costs associated with the gasifier portions of the plant and lignite mine. During the third and fourth quarters of 2017, the Company recorded charges to income of $242 million ($206 million after tax), including $164 million for ongoing project costs, estimated mine and gasifier-related costs, and certain termination costs during the suspension period prior to conclusion of the Kemper Settlement Docket, as well as the charge associated with the Kemper Settlement Agreement discussed below. Additional pre-tax cancellation costs, including mine and plant closure and contract termination costs, currently estimated at approximately $50 million to $100 million (excluding salvage), are expected to be incurred in 2018. The Company has begun effortsstatutory obligation to dispose of or abandonspent nuclear fuel. Consequently, Alabama Power and Georgia Power pursued and continue to pursue legal remedies against the mineU.S. government for its partial breach of contract.
In 2014, Alabama Power and gasifier-related assets.Georgia Power filed their third round of lawsuits against the U.S. government in the Court of Federal Claims, seeking damages for the costs of continuing to store spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 for the period from January 1, 2011 through December 31, 2013. The damage period was subsequently extended to December 31, 2014. In 2019, the Court of Federal Claims granted Alabama Power's and Georgia Power's motion for summary judgment on damages not disputed by the U.S. government, awarding those undisputed damages to Alabama Power and Georgia Power. However, those undisputed damages are not collectible until the court enters final judgment on the remaining damages.
Rate RecoveryIn 2017, Alabama Power and Georgia Power filed their fourth round of lawsuits against the U.S. government in the Court of Federal Claims, seeking damages for the costs of continuing to store spent nuclear fuel at Plants Farley, Hatch, and Vogtle Units 1 and 2 for the period from January 1, 2015 through December 31, 2017. In 2020, Alabama Power and Georgia Power filed amended complaints in those fourth-round lawsuits adding damages incurred from January 1, 2018 to December 31, 2019 to the claim period.
Kemper Settlement Agreement
On February 6, 2018,The outstanding claims for the Mississippi PSC voted to approve the Kemper Settlement Agreement. The Kemper Settlement Agreement provides for an annual revenue requirement of approximately $99.3period January 1, 2011 through December 31, 2019 total $106 million and $128 million for costs relatedAlabama Power and Georgia Power (based on its ownership interests), respectively. Damages will continue to accumulate until the Kemper County energy facility, which includesissue is resolved, the impactU.S. government disposes of Tax Reform Legislation. The revenue requirement is based on (i) a fixed ROE for 2018 of 8.6% excluding any performance adjustment, (ii) a ROE for 2019 calculated in accordance with PEP, excluding the performance adjustment, (iii) for future years, a performance-based ROE calculatedAlabama Power's and Georgia Power's spent nuclear fuel pursuant to PEP, and (iv) amortization periods for the related regulatory assets and liabilities of eight years and six years, respectively. The revenue requirement also reflects a disallowance related to a portion of the Company's investmentits contractual obligations, or alternative storage is otherwise provided. No amounts have been recognized in the Kemper County energy facility requested for inclusion in rate base, which was recorded in the fourth quarter 2017financial statements as an additional charge to income of approximately $78 million ($85 million net of accumulated depreciation of $7 million) pre-tax ($48 million after tax).
Under the Kemper Settlement Agreement, retail customer rates will reflect a reduction of approximately $26.8 million annually and include no recovery for costs associated with the gasifier portion of the Kemper County energy facility in 2018 or at any future date. On February 12, 2018, the Company made the required compliance filing with the Mississippi PSC. The Kemper Settlement Agreement also requires (i) the CPCN for the Kemper County energy facility to be modified to limit it to natural gas combined cycle operation and (ii) the Company to file a reserve margin plan with the Mississippi PSC by August 2018.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

As of December 31, 2017,2023 for any potential recoveries from the balances associated with the Kemper County energy facility regulatory assets and liabilities were $114 million and $26 million, respectively.
As a result of the Mississippi PSC order on February 6, 2018, rate recovery for the Kemper County energy facility is resolved, subject to any future legal challenges.
2015 Rate Case
On December 3, 2015, the Mississippi PSC issued the In-Service Asset Rate Order regarding the Kemper County energy facility assets that were commercially operational and currently providing service to customers (the transmission facilities, combined cycle, natural gas pipeline, and water pipeline) and other related costs. The In-Service Asset Rate Order provided for retail rate recovery of an annual revenue requirement of approximately $126 million, based on the Company's actual average capital structure, with a maximum common equity percentage of 49.733%, a 9.225% return on common equity, and actual embedded interest costs. The In-Service Asset Rate Order also included a prudence finding of all costs in the stipulated revenue requirement calculation for the in-service assets.
In connection with the implementation of the In-Service Asset Rate Order and wholesale rates, the Company began expensing certain ongoing project costs and certain retail debt carrying costs that previously were deferred and began amortizing certain regulatory assets associated with assets placed in service and consulting and legal fees over periods ranging from two years to 10 years. On July 6, 2017, the Mississippi PSC issued an order requiring the Company to establish a regulatory liability account to maintain current rates related to the Kemper County energy facility following the July 2017 completion of the amortization period for certain of these regulatory assets. See "FERC Matters" herein for additional information related to the 2016 settlement agreement with wholesale customers.
Lignite Mine and CO2 Pipeline Facilitiespending lawsuits.
The Company owns the lignite mine and equipment and mineral reserves located around the Kemper County energy facility site. The mine started commercial operation in June 2013.
In 2010, the Company executed a 40-year management fee contract with Liberty Fuels Company, LLC (Liberty Fuels), a wholly-owned subsidiary of The North American Coal Corporation, which developed, constructed, and is responsible for the mining operations through the end of the mine reclamation. As the mining permit holder, Liberty Fuels has a legal obligation to perform mine reclamation and the Company has a contractual obligation to fund all reclamation activities. The Company expects mine reclamation to begin in 2018. In addition to the obligation to fund the reclamation activities, the Company provided working capital support to Liberty Fuels through cash advances for capital purchases, payroll, and other operating expenses. See Note 1 under "Asset Retirement Obligations and Other Costs of Removal" and "Variable Interest Entities" for additional information.
In addition, the Company constructed the CO2 pipeline for the planned transport of captured CO2 for use in enhanced oil recovery and entered into an agreement with Denbury Onshore (Denbury) to purchase the captured CO2. Denbury has the right to terminate the contract at any time because the Company did not place the Kemper IGCC in service by July 1, 2017.
The ultimatefinal outcome of these matters cannot be determined at this time. However, Alabama Power and Georgia Power expect to credit any recoveries for the benefit of customers in accordance with direction from their respective PSC; therefore, no material impact on Southern Company's, Alabama Power's, or Georgia Power's net income is expected.
LitigationOn-site dry spent fuel storage facilities are operational at all three plants and can be expanded to accommodate spent fuel through the expected life of each plant.
On April
Nuclear Insurance
Under the Price-Anderson Amendments Act (Act), Alabama Power and Georgia Power maintain agreements of indemnity with the NRC that, together with private insurance, cover third-party liability arising from any nuclear incident occurring at the companies' nuclear power plants. The Act provides funds up to $16.2 billion for public liability claims that could arise from a single nuclear incident. Each nuclear plant is insured against this liability to a maximum of $450 million by American Nuclear Insurers (ANI), with the remaining coverage provided by a mandatory program of deferred premiums that could be assessed, after a nuclear incident, against all owners of commercial nuclear reactors. A company could be assessed up to $166 million per incident for each licensed reactor it operates but not more than an aggregate of $25 million per incident to be paid in a calendar year for each reactor. Such maximum assessment, excluding any applicable state premium taxes, for Alabama Power and Georgia Power, based on its ownership and buyback interests in all licensed reactors, is $332 million and $473 million, respectively, per incident, but not more than an aggregate of $49 million and $71 million, respectively, to be paid for each incident in any one year. Both the maximum assessment per reactor and the maximum yearly assessment are adjusted for inflation at least every five years. The next scheduled adjustment is due no later than November 1, 2028. See Note 5 under "Joint Ownership Agreements" for additional information on joint ownership agreements.
Alabama Power and Georgia Power are members of Nuclear Electric Insurance Limited (NEIL), a mutual insurer established to provide property damage insurance in an amount up to $1.5 billion for members' operating nuclear generating facilities. Additionally, both companies have NEIL policies that currently provide decontamination, excess property insurance, and premature decommissioning coverage up to $1.25 billion for nuclear losses and policies providing coverage up to $750 million for non-nuclear losses in excess of the $1.5 billion primary coverage.
NEIL also covers the additional costs that would be incurred in obtaining replacement power during a prolonged accidental outage at a member's nuclear plant. Members can purchase this coverage, subject to a deductible waiting period of up to 26 2016,weeks, with a complaint againstmaximum per occurrence per unit limit of $490 million. After the Company was fileddeductible period, weekly indemnity payments would be received until either the unit is operational or until the limit is exhausted. Alabama Power and Georgia Power each purchase limits based on the projected full cost of replacement power, subject to ownership limitations, and have each elected a 12-week deductible waiting period for each nuclear plant.
A builders' risk property insurance policy has been purchased from NEIL for the construction of Plant Vogtle Unit 4. This policy provides the Vogtle Owners up to $2.75 billion for accidental property damage occurring during construction.
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Under each of the NEIL policies, members are subject to assessments each year if losses exceed the accumulated funds available to the insurer. The maximum annual assessments for Alabama Power and Georgia Power as of December 31, 2023 under the NEIL policies would be $54 million and $89 million, respectively.
Claims resulting from terrorist acts and cyber events are covered under both the ANI and NEIL policies (subject to normal policy limits). The maximum aggregate that NEIL will pay for all claims resulting from terrorist acts and cyber events in Harrison County Circuit Court (Circuit Court) by Biloxi Freezing & Processing Inc., Gulfside Casino Partnership, and John Carlton Dean, which was amended and refiled on July 11, 2016 to include, amongany 12-month period is $3.2 billion each, plus such additional amounts NEIL can recover through reinsurance, indemnity, or other things, Southern Company as a defendant. The individual plaintiff allegessources.
For all on-site property damage insurance policies for commercial nuclear power plants, the NRC requires that the Companyproceeds of such policies shall be dedicated first for the sole purpose of placing the reactor in a safe and Southern Company violatedstable condition after an accident. Any remaining proceeds are to be applied next toward the Mississippi Unfair Trade Practices Act. All plaintiffs have alleged thatcosts of decontamination and debris removal operations ordered by the CompanyNRC, and Southern Company concealed, falsely represented, and failedany further remaining proceeds are to fully disclose important facts concerning the cost and schedule of the Kemper County energy facility and that these alleged breaches have unjustly enriched the Company and Southern Company. The plaintiffs seek unspecified actual damages and punitive damages; ask the Circuit Court to appoint a receiver to oversee, operate, manage, and otherwise control all affairs relatingbe paid either to the Kemper County energy facility; askapplicable company or to its debt trustees as may be appropriate under the Circuit Courtpolicies and applicable trust indentures. In the event of a loss, the amount of insurance available might not be adequate to revoke any licenses or certificates authorizing the Company or Southern Company to engage in any business relatedcover property damage and other expenses incurred. Uninsured losses and other expenses, to the Kemper County energy facility in Mississippi;extent not recovered from customers, would be borne by Alabama Power or Georgia Power, as applicable, and seek attorney's fees, costs, and interest. The plaintiffs also seek an injunction to prevent any Kemper County energy facility costs from being charged to customers through electric rates. On June 23, 2017, the Circuit Court ruled in favor of motions by Southern Company and the Company and dismissed the case. On July 7, 2017, the plaintiffs filed notice of an appeal. The Company believes this legal challenge has no merit; however, an adverse outcome in this proceeding could have a material impacteffect on theSouthern Company's, results of operations,Alabama Power's, and Georgia Power's financial condition and liquidity.results of operations.
All retrospective assessments, whether generated for liability, property, or replacement power, may be subject to applicable state premium taxes.
Other Matters
Traditional Electric Operating Companies
In April 2019, Bellsouth Telecommunications d/b/a AT&T Alabama (AT&T) filed a complaint against Alabama Power with the FCC alleging that the pole rental rate AT&T is required to pay pursuant to the parties' joint use agreement is unjust and unreasonable under federal law. The Company intends to vigorously defend itselfcomplaint sought a new rate and approximately $87 million in this matter andrefunds of alleged overpayments for the preceding six years. In August 2019, the FCC stayed the case in favor of arbitration, which AT&T has not pursued. The joint use agreement remains in effect. The ultimate outcome of this matter cannot be determined at this time.time, but an adverse outcome could have a material impact on the financial statements of Southern Company and Alabama Power. Georgia Power and Mississippi Power have joint use agreements with other AT&T affiliates.
Mississippi Power
Kemper County Energy Facility
In 2021, 2022, and 2023, Mississippi Power recorded charges to income associated with abandonment and related closure costs and ongoing period costs, net of salvage proceeds, for the mine and gasifier-related assets at the Kemper County energy facility. These charges, including related tax impacts, totaled $11 million pre-tax ($8 million after tax) in 2021, $15 million pre-tax ($12 million after tax) in 2022, and $17 million pre-tax ($12 million after tax) in 2023. The pre-tax charges are included in other operations and maintenance expenses on the statements of income.
Dismantlement of the abandoned gasifier-related assets and site restoration activities are expected to be completed by 2026. Additional pre-tax period costs associated with dismantlement and site restoration activities, including related costs for compliance and safety, ARO accretion, and property taxes, net of salvage, are estimated to total approximately $15 million annually through 2025.
Mississippi Power owns the lignite mine located around the Kemper County energy facility site. As a result of the abandonment of the Kemper IGCC, final mine reclamation began in 2018 and was substantially completed in 2020, with monitoring expected to continue through 2028.
As the mining permit holder, Liberty Fuels Company, LLC, a wholly-owned subsidiary of The North American Coal Corporation, has a legal obligation to perform mine reclamation and Mississippi Power has a contractual obligation to fund all reclamation activities. See Note 6 for additional information.
See "General Litigation Matters –Southern Company and Mississippi Power" herein for information regarding litigation associated with the Kemper County energy facility.
Plant Daniel
In conjunction with Southern Company's 2019 sale of Gulf Power, NextEra Energy held back $75 million of the purchase price pending Mississippi Power and NextEra Energy negotiating a mutually acceptable revised operating agreement for Plant Daniel. In July 2022, the co-owners executed a revised operating agreement and Southern Company subsequently received the remaining $75 million of the purchase price. The dispatch procedures in the revised operating agreement for the two jointly-owned coal units
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On June 9, 2016, Treetop, Greenleaf CO2 Solutions, LLC (Greenleaf), Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC, and Tellus Operating Group filed a complaint against the Company, Southern Company, and SCS in the state court in Gwinnett County, Georgia. The complaint related to the cancelled CO2 contract with Treetop and alleged fraudulent misrepresentation, fraudulent concealment, civil conspiracy, and breach of contract on the part of the Company, Southern Company, and SCS and sought compensatory damages of $100 million, as well as unspecified punitive damages. Southern Company, the Company, and SCS moved to compel arbitration pursuant to the terms of the CO2 contract, which the court granted on May 4, 2017. On June 28, 2017, Treetop, Greenleaf, Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC, and Tellus Operating Group filed a claim for arbitration requesting $500 million in damages. On December 28, 2017, the Company reached a settlement agreement with Treetop, Greenleaf, Tenrgys, LLC, Tellus Energy, LLC, WCOA, LLC, and Tellus Operating Group and the arbitration was dismissed.
4. JOINT OWNERSHIP AGREEMENTS
The Company and Alabama Power own, as tenants in common, Units 1 and 2 (total capacity of 500 MWs) at Greene County Steam Plant, which is located in Alabama and operated by Alabama Power. Additionally, the Company and Gulf Power, own as tenants in common, Units 1 and 2 (total capacity of 1,000 MWs) at Plant Daniel which is locatedresulted in Mississippi and operated byPower designating one of the Company. At December 31, 2017, the Company's percentage ownership and investment in these jointly-owned facilities in commercial operation weretwo units as follows:
Generating
Plant
Company
Ownership
 Plant in Service 
Accumulated
Depreciation
 CWIP
   (in millions)  
Greene County       
Units 1 and 240% $164
 $55
 $1
Daniel       
Units 1 and 250% $713
 $189
 $4
The Company's proportionate share of plant operating expenses is included in the statements of operationsprimary and the Company is responsible for providing its own financing.
5. INCOME TAXES
On behalfother as secondary in lieu of the Company, Southern Company files a consolidated federal income tax return and various combined and separate state income tax returns. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.
Federal Tax Reform Legislation
Following the enactmentseparately owning 100% of Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory assets and liabilities cannot be determined at this time. See Note 3 under "Regulatory Matters" for additional information.

NOTES (continued)
single generating unit. Mississippi Power Company 2017 Annual Report

Current and Deferred Income Taxes
Details of income tax provisions are as follows:
 2017 2016 2015
 (in millions)
Federal —     
Current$194
 $(31) $(768)
Deferred(753) (60) 704
 (559) (91) (64)
State —     
Current
 (6) (81)
Deferred27
 (7) 73
 27
 (13) (8)
Total$(532) $(104) $(72)

NOTES (continued)
Mississippi Power Company 2017 Annual Report

purchase its co-owner's ownership interest for $1 on January 15, 2024. The tax effects of temporary differences between the carrying amounts of assets and liabilities in the financial statements and their respective tax bases, which give rise to deferred tax assets and liabilities, are as follows:
 2017 2016
 (in millions)
Deferred tax liabilities —   
Accelerated depreciation$373
 $386
Property basis difference242
 852
Regulatory assets associated with AROs34
 72
Pensions and other benefits28
 49
Regulatory assets associated with employee benefit obligations45
 70
Regulatory assets associated with the Kemper County energy facility31
 82
Regulatory assets associated with Plant Daniel9
 13
Rate differential
 141
Federal effect of state deferred taxes9
 
Ad valorem over/under recovery11
 14
Regulatory assets for Mercury and Air Toxics Standards compliance11
 8
Other11
 91
Total804
 1,778
Deferred tax assets —   
Fuel clause over recovered
 26
Estimated loss on Kemper IGCC722
 484
Pension and other benefits62
 96
Federal NOL40
 109
Property insurance15
 27
Premium on long-term debt7
 14
AROs34
 72
Property basis difference70
 
Affirmative adjustments31
 
Regulatory liability associated with Tax Reform Legislation (not subject to normalization)
27
 
Deferred state tax assets133
 113
Deferred federal tax assets
 31
Federal effect of state deferred taxes
 19
Other32
 31
Total1,173
 1,022
Valuation allowance (net of $35 million in federal benefit)122
 
Accumulated deferred income tax (assets)/liabilities

(247) 756
The implementation of Tax Reform Legislation significantly reduced accumulated deferred income taxes, partially offset by bonus depreciation provisions in the Protecting Americans from Tax Hikes Act. Tax Reform Legislation also significantly reduced tax-related regulatory assets and increased tax-related regulatory liabilities.
At December 31, 2017, the tax-related regulatory assets were $36 million. These assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest.
At December 31, 2017, the tax-related regulatory liabilities were $376 million. These liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and unamortized ITCs.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

In accordance with regulatory requirements, deferred federal ITCs are amortized over the life of the related property with such amortization normally applied as a credit to reduce depreciation in the statements of operations. Credits for non-Kemper County energy facility related deferred ITCs amortized in this manner amounted to $1 million in each of 2017, 2016, and 2015.
At December 31, 2017, the Company had state of Mississippi NOL carryforwards totaling approximately $2.8 billion, resulting in deferred tax assets of approximately $111 million. The NOLs will expire between 2031 and 2037.
Effective Tax Rate
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
 2017 2016 2015
Federal statutory rate(35.0)% (35.0)% (35.0)%
State income tax, net of federal deduction0.6
 (5.7) (6.3)
Non-deductible book depreciation0.1
 0.7
 1.3
AFUDC-equity
 (28.5) (49.6)
Non-deductible equity portion on Kemper IGCC write-off5.3
 
 
Tax Reform Legislation11.9
 
 
Other
 
 (2.9)
Effective income tax rate (benefit rate)(17.1)% (68.5)% (92.5)%
The decrease in the Company's 2017 effective tax rate (benefit rate), as compared to 2016, is primarily due to an increase in estimated losses associated with the Kemper IGCC, a decrease in non-taxable AFUDC equity, and a decrease due to the remeasurement of deferred income taxes resulting from Tax Reform Legislation. The decrease in the Company's 2016 effective tax rate (benefit rate), as compared to 2015, is primarily due to an increase in estimated losses associated with the Kemper IGCC and an increase in non-taxable AFUDC equity.
Tax Reform Legislation reduced the corporate income tax rate from 35% to 21%. As a result of implementation, the Company restated future tax benefits/deductions recorded as deferred tax assets/liabilities to reflect the new rate. The implementation resulted in a $372 million increase in tax expense and a $375 million increase in regulatory liabilities.
In March 2016, the FASB issued ASU 2016-09, which changed the accounting for income taxes for share-based payment award transactions. Entities are required to recognize all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation as income tax expense or benefit in the income statement. The adoption of ASU 2016-09revised operating agreement did not have a material impact on the Company's overall effective tax rate.Mississippi Power's financial statements. See Note 12 under "Recently Issued Accounting Standards" for additional information.
Unrecognized Tax Benefits
Changes during the year in unrecognized tax benefits were as follows:
 2017 2016 2015
 (in millions)
Unrecognized tax benefits at beginning of year$465
 $421
 $165
Tax positions increase from current periods
 26
 32
Tax positions increase from prior periods2
 18
 224
Tax positions decrease from prior periods(177) 
 
Reductions due to settlements(290) 
 
Balance at end of year$
 $465
 $421

NOTES (continued)
Mississippi"Mississippi Power Company 2017 Annual Report

The tax positions increases from current periods and prior periods for 2017, 2016 and 2015 relate to state tax benefits, deductions for R&E expenditures, and charitable contribution carryforwards that were impacted as a result of the settlement of R&E expenditures associated with the Kemper County energy facility, as well as federal income tax benefits from deferred ITCs. The tax positions decrease from prior periods and reductions due to settlements for 2017 relate primarily to the settlement of R&E expenditures associated with the Kemper County energy facility. See "Section 174 Research and Experimental Deduction" herein for additional information. These amounts are presented on a gross basis without considering the related federal or state income tax impact.
The impact on the Company's effective tax rate, if recognized, is as follows:
 2017 2016 2015
 (in millions)
Tax positions impacting the effective tax rate$
 $1
 $(2)
Tax positions not impacting the effective tax rate
 464
 423
Balance of unrecognized tax benefits$
 $465
 $421
The tax positions not impacting the effective tax rate primarily relate to state tax benefits and charitable contribution carryforwards that were impacted as a result of the settlement of R&E expenditures associated with the Kemper County energy facility. See "Section 174 Research and Experimental Deduction" herein for additional information.
Accrued interest for unrecognized tax benefits was as follows:
 2017 2016 2015
 (in millions)
Interest accrued at beginning of year$28
 $13
 $3
Interest accrued during the year(28) 15
 10
Balance at end of year$
 $28
 $13
The Company classifies interest on tax uncertainties as interest expense. The Company did not accrue any penalties on uncertain tax positions.
It is reasonably possible that the amount of the unrecognized tax benefits could change within 12 months. The settlement of federal and state audits could impact the balances significantly. At this time, an estimate of the range of reasonably possible outcomes cannot be determined.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2016. Southern Company is a participant in the Compliance Assurance Process of the IRS. The audits for the Company's state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2011.
Section 174 Research and Experimental Deduction
Southern Company, on behalf of the Company, has reflected deductions for R&E expenditures related to the Kemper County energy facility in its federal income tax calculations since 2013 and filed amended federal income tax returns for 2008 through 2013 to also include such deductions. In December 2016, Southern Company and the IRS reached a proposed settlement, which was approved on September 8, 2017 by the U.S. Congress Joint Committee on Taxation (JCT), resolving a methodology for these deductions. As a result of the JCT approval, Southern Company recognized $176 million of previously unrecognized tax benefits and reversed $36 million of associated accrued interest.
6. FINANCING
Going Concern
The Company's financial statement presentation contemplates continuation of the Company as a going concern as a result of Southern Company's anticipated ongoing financial support of the Company. Specifically, the Company has been informed by Southern Company that in the event sufficient funds are not available from external sources, Southern Company intends to provide the Company with loans and/or equity to fund the remaining indebtedness to mature and other cash needs over the next 12 months. As of December 31, 2017, the Company's current liabilities exceeded current assets by approximately $911 million primarily due to a $900 million unsecured term loan that matures on March 31, 2018. The Company expects to refinance the unsecured term loan with external security issuances and/or borrowings from financial institutions or Southern Company. To fund

NOTES (continued)
Mississippi Power Company 2017 Annual Report

the Company's capital needs over the next 12 months, the Company intends to utilize operating cash flows, external security issuances, lines of credit, bank term loans, equity contributions from Southern Company and, to the extent necessary, loans from Southern Company.
Securities Due Within One Year
A summary of scheduled maturities and redemptions of securities due within one year at December 31, 2017 and 2016 was as follows:
 2017 2016
 (in millions)
Parent company loans$
 $551
Senior notes
 35
Bank term loans900
 
Revenue bonds(*)
90
 40
Capitalized leases
 3
Unamortized debt issuance expense

(1) 
Outstanding at December 31$989
 $629
(*)Includes $50 million in revenue bonds classified as short term at December 31, 2017 that were remarketed in an index rate mode subsequent to December 31, 2017. Also includes $40 million in pollution control revenue bonds classified as short term since they are variable rate demand obligations supported by short-term credit facilities; however, the final maturity dates range from 2020 to 2028.
Maturities through 2022 applicable to total long-term debt are as follows: $900 million in 2018, $125 million in 2019, and $270 million in 2021. For long-term debt, other than revenue bonds, there are no scheduled maturities for 2020 and 2022.
Parent Company Loans and Equity Contributions
At December 31, 2016, the Company had $551 million of outstanding promissory notes to Southern Company.
In February 2017, the Company amended $551 million in promissory notes to Southern Company extending the maturity dates of the notes from December 1, 2017 to July 31, 2018. In the second quarter 2017, the Company borrowed an additional $40 million under a promissory note issued to Southern Company.
In June 2017, Southern Company made equity contributions totaling $1.0 billion to the Company. The Company used a portion of the proceeds to (i) prepay $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan, which matures on March 30, 2018; (ii) repay all of the $591 million outstanding principal amount of promissory notes to Southern Company; and (iii) repay a $10 million short-term bank loan.
In September 2017, the Company issued a floating rate promissory note to Southern Company in an aggregate principal amount of up to $150 million bearing interest based on one-month LIBOR. The Company borrowed $109 million under this promissory note primarily to satisfy its federal income tax obligations for the quarter ending September 30, 2017 and subsequently repaid the promissory note upon receipt of its income tax refund from the U.S. federal government related to the settlement concerning deductible R&E expenditures. See Note 5 under "Section 174 Research and Experimental Deduction" for additional information. At December 31, 2017, the Company had no outstanding promissory notes to Southern Company.
Bank Term Loans
In March 2017, the Company issued a $9 million short-term bank note bearing interest at 5% per annum, which was repaid in April 2017.
In June 2017, the Company used a portion of the proceeds from Southern Company equity contributions to prepay $300 million of the outstanding principal amount under its $1.2 billion unsecured term loan, which matures on March 30, 2018, and to repay $10 million of the outstanding principal amount of bank loans. See "Parent Company Loans and Equity Contributions" herein for more information.
This unsecured term loan has a covenant that limits debt levels to 65% of total capitalization, as defined in the agreement. For purposes of this definition, debt excludes any long-term debt payable to affiliated trusts and other hybrid securities. At December 31, 2017, the Company was in compliance with its debt limit.
In August 2017, the Company repaid a $12.5 million short-term bank note.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

At December 31, 2017, the Company had a $900 million unsecured term loan outstanding, which was reflected in the statements of capitalization as securities due within one year. At December 31, 2016, the Company had a $1.2 billion unsecured term loan outstanding, which was reflected in the statements of capitalization as long-term debt.
Senior Notes
At December 31, 2017 and 2016, the Company had $755 million and $790 million of senior notes outstanding, respectively, which included senior notes due within one year. These senior notes are effectively subordinated to the secured debt of the Company. See "Plant Daniel Revenue Bonds" below– Integrated Resource Plan" for additional information regarding the Company's secured indebtedness.on Plant Daniel.
Plant Daniel Revenue Bonds
In 2011, in connection with the Company's election under its operating lease of Plant Daniel Units 3 and 4 to purchase the assets, the Company assumed the obligations of the lessor related to $270 million aggregate principal amount of Mississippi Business Finance Corporation Taxable Revenue Bonds, 7.13% Series 1999A due October 20, 2021, issued for the benefit of the lessor. These bonds are secured by Plant Daniel Units 3 and 4 and certain related personal property. The bonds were recorded at fair value as of the date of assumption, or $346 million, reflecting a premium of $76 million. See "Assets Subject to Lien" herein for additional information.
Pollution Control Revenue Bonds
Pollution control obligations represent loans to the Company from public authorities of funds derived from sales by such authorities of pollution control revenue bonds issued to finance pollution control and solid waste disposal facilities. The Company is required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. The amount of tax-exempt pollution control revenue bonds outstanding at December 31, 2017 and 2016 was $83 million.
Other Revenue Bonds
Other revenue bond obligations represent loans to the Company from a public authority of funds derived from the sale by such authority of revenue bonds issued to finance a portion of the costs of constructing the Kemper County energy facility and related facilities.
The Company had $50 million of such obligations outstanding related to tax-exempt revenue bonds at December 31, 2017 and 2016. Such amounts are reflected in the statements of capitalization as long-term debt.
Capital Leases
In 2013, the Company entered into an agreement to sell the air separation unit for the Kemper County energy facility and also entered into a 20-year nitrogen supply agreement. The nitrogen supply agreement was determined to be a sale/leaseback agreement, which resulted in a capital lease obligation of $74 million at December 31, 2016. Following the suspension of the Kemper IGCC, the Company entered into an asset purchase and settlement agreement in December 2017 with the lessor, which terminated the capital lease obligation. There were no contingent rentals in the contract and a portion of the monthly payment specified in the agreement was related to executory costs for the operation and maintenance of the air separation unit and excluded from the minimum lease payments. The minimum lease payments for 2017 were $7 million. See Note 3 under "Kemper County Energy facility" for additional information.
Assets Subject to Lien
The revenue bonds assumed in conjunction with the purchase of Plant Daniel Units 3 and 4 are secured by Plant Daniel Units 3 and 4 and certain related personal property. There are no agreements or other arrangements among the Southern Company system companies under which the assets of one company have been pledged or otherwise made available to satisfy the obligations of Southern Company or another of its other subsidiaries. See "Plant Daniel Revenue Bonds" herein for additional information.
On October 4, 2017, the Company executed agreements with its largest retail customer, Chevron Products Company (Chevron), to continue providing retail service to the Chevron refinery in Pascagoula, Mississippi through 2038, subject to the approval of the Mississippi PSC. The agreements grant Chevron a security interest in its co-generation assets, with a net book value of approximately $93 million, located at Chevron's refinery that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of the Company's credit rating to below investment grade by two of the three rating agencies.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

Outstanding Classes of Capital Stock
The Company currently has preferred stock (including depositary shares which represent one-fourth of a share of preferred stock) and common stock authorized and outstanding. The preferred stock of the Company contains a feature that allows the holders to elect a majority of the Company's board of directors if preferred dividends are not paid for four consecutive quarters. Because such a potential redemption-triggering event is not solely within the control of the Company, this preferred stock is presented as "Cumulative Redeemable Preferred Stock" in a manner consistent with temporary equity under applicable accounting standards. The Company's preferred stock and depositary preferred stock, without preference between classes, rank senior to the Company's common stock with respect to payment of dividends and voluntary or involuntary dissolution. The preferred stock and depositary preferred stock is subject to redemption at the option of the Company at a redemption price equal to 100% of the liquidation amount of the stock. Information for each outstanding series is in the table below:
Preferred StockPar Value/Stated Capital Per Share Shares Outstanding Redemption Price Per Share
4.40% Preferred Stock$100
 8,867
 $104.32
4.60% Preferred Stock$100
 8,643
 $107.00
4.72% Preferred Stock$100
 16,700
 $102.25
5.25% Preferred Stock(*)
$100
 300,000
 $100.00
(*)There are 1,200,000 outstanding depositary shares, each representing one-fourth of a share of the 5.25% preferred stock.
Dividend Restrictions
The Company can only pay dividends to Southern Company out of retained earnings or paid-in-capital.
Bank Credit Arrangements
At December 31, 2017, committed credit arrangements with banks were as follows:
Expires     
Executable
Term Loans
 Expires Within One Year
2018 Total Unused 
One
Year
 
Two
Years
 Term Out No Term Out
(in millions) (in millions) (in millions) (in millions)
$100 $100 $100 $— $— $— $100
In November 2017, the Company amended certain of its one-year credit arrangements in an aggregate amount of $100 million to extend the maturity dates from 2017 to 2018.
Subject to applicable market conditions, the Company expects to renew its bank credit arrangements, as needed, prior to expiration. In connection therewith, the Company may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
Most of these bank credit arrangements require payment of commitment fees based on the unused portions of the commitments or to maintain compensating balances with the banks. Commitment fees average less than 1/4 of 1% for the Company. Compensating balances are not legally restricted from withdrawal.
Most of these bank credit arrangements contain covenants that limit the Company's debt levels to 65% of total capitalization, as defined in the agreements. For purposes of these definitions, debt excludes certain hybrid securities.
A portion of the $100 million unused credit with banks is allocated to provide liquidity support to the Company's pollution control revenue bonds and its commercial paper borrowings. The amount of variable rate pollution control revenue bonds outstanding requiring liquidity support as of December 31, 2017 was $40 million. In addition, at December 31, 2017, the Company had approximately $50 million of fixed rate revenue bonds that were remarketed from a long-term interest rate mode to an index rate mode, subsequent to December 31, 2017.
At December 31, 2017 and 2016, there was no commercial paper debt outstanding.
At December 31, 2017 and 2016, there was $4 million and $23 million, respectively, of short-term debt outstanding.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

7. COMMITMENTS
Fuel and Purchased Power AgreementsCommitments
To supply a portion of the fuel requirements of itsthe Southern Company system's electric generating plants, the Southern Company system has entered into various long-term commitments not recognized on the balance sheets for the procurement and delivery of fossil fuel which are not recognized onand, for Alabama Power and Georgia Power, nuclear fuel. The majority of the balance sheets. In 2017, 2016, and 2015, the Company incurredRegistrants' fuel expense of $395 million, $343 million, and $443 million, respectively,for the majority of whichperiods presented was purchased under long-term commitments. The CompanyEach Registrant expects that a substantial amount of its future fuel needs will continue to be purchased under long-term commitments.
Georgia Power has commitments, in the form of capacity purchases, regarding a portion of a 5% interest in the original cost of Plant Vogtle Units 1 and 2 owned by MEAG Power that are in effect until the later of the retirement of the plant or the latest stated maturity date of MEAG Power's bonds issued to finance such ownership interest. The payments for capacity are required whether or not any capacity is available. Portions of the capacity payments made to MEAG Power for its Plant Vogtle Units 1 and 2 investment relate to costs in excess of Georgia Power's allowed investment for ratemaking purposes. The present value of these portions at the time of the disallowance was written off. Generally, the cost of such capacity is included in purchased power in Southern Company's statements of income and in purchased power, non-affiliates in Georgia Power's statements of income. Georgia Power's capacity payments related to this commitment totaled $3 million, $4 million, and $6 million in 2023, 2022, and 2021, respectively. At December 31, 2023, Georgia Power's estimated long-term obligations related to this commitment totaled $39 million, consisting of $4 million annually for 2024 and 2025, $2 million annually for 2026 through 2028, and $25 million thereafter.
See Note 9 for information regarding PPAs accounted for as leases.
Southern Company Gas has commitments for pipeline charges, storage capacity, and gas supply, including charges recoverable through natural gas cost recovery mechanisms or, alternatively, billed to marketers selling retail natural gas. Gas supply commitments include amounts for gas commodity purchases associated with Nicor Gas and SouthStar of 38 million mmBtu at floating gas prices calculated using forward natural gas prices at December 31, 2023 and valued at $98 million. Southern Company Gas provides guarantees to certain gas suppliers for certain of its subsidiaries in support of payment obligations. Southern Company Gas' expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets at December 31, 2023 were as follows:
Pipeline Charges, Storage Capacity, and Gas Supply
(in millions)
2024$587 
2025432 
2026231 
2027148 
2028103 
Thereafter785 
Total$2,286 
Guarantees
SCS may enter into various types of wholesale energy and natural gas contracts acting as an agent for the Company and all of the other traditional electric operating companies and Southern Power. Under these agreements, each of the traditional electric operating companies and Southern Power may be jointly and severally liable. Accordingly, Southern Company has entered into keep-well agreements with the Company and each of the other traditional electric operating companies to ensure the Companythey will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of Southern Power as a contracting party under these agreements.
In addition, the CompanyAlabama Power has guaranteed a $100 million principal amount long-term bank loan SEGCO entered into various long-term commitmentsin 2018 and subsequently extended and amended. Georgia Power has agreed to reimburse Alabama Power for the purchaseportion of energy through PPAs associated with solar facilities. The energy related costs associated with PPAs are recovered through the fuel cost recovery clause.
Operating Leases
The Company has entered into operating leases with Southern Linc and third parties for the usesuch obligation corresponding to Georgia Power's proportionate ownership of cellular tower space. These agreements have initial terms ranging from fiveSEGCO's stock if Alabama Power is called upon to 10 years and renewal options of up to 20 years. The Company has other operating lease agreements with various terms and expiration dates. Total rent expense was $3 million, $3 million, and $5 million for 2017, 2016, and 2015, respectively. The Company includes any step rents, fixed escalations, lease concessions, and reasonably assured renewal periods inmake such payment under its computation of minimum lease payments.
Estimated minimum lease payments under operating leases atguarantee. At December 31, 2017 were as follows:2023, the capitalization of SEGCO consisted of $69 million of equity and $100
II-162
    
Affiliate Operating Leases(a)
 
Non-Affiliate Operating Lease(b)
 Total
    (in millions)
2018   $2
 $1
 $3
2019   2
 1
 3
2020   2
 1
 3
2021   2
 
 2
2022   2
 
 2
2023 and thereafter   7
 
 7
Total   $17
 $3
 $20
(a)Includes operating leases with affiliates primarily related to cellular towers.
(b)Primarily includes railcar and fuel handling equipment leases for Plant Daniel.
In addition to the above rental commitments, the Company entered into operating lease agreements for aluminum railcars for the transportation of coal at Plant Daniel, which is jointly owned with Gulf Power. The Company has the option to purchase the railcars at the greater of lease termination value or fair market value or to renew the leases at the end of the lease term. The Company also has separate lease agreements for other railcars that do not contain a purchase option.
The Company's 50% share of the lease costs, charged to fuel stock and recovered through the fuel cost recovery clause, was $1 million in 2017, $2 million in 2016, and $2 million in 2015.
In addition to railcar leases, the Company has other operating leases for fuel handling equipment at Plant Daniel. The Company's 50% share of the leases for fuel handling was charged to fuel handling expense annually from 2015 through 2017; however, those amounts were immaterial for the reporting period.



COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Mississippi Power Company 2017 Annual Report

million of long-term debt that matures in November 2024, on which the annual interest requirement is derived from a variable rate index. SEGCO had no short-term debt outstanding at December 31, 2023. See Note 7 under "SEGCO" for additional information.
8. STOCK COMPENSATIONAs discussed in Note 9, Alabama Power and Georgia Power have entered into certain residual value guarantees related to railcar leases.
Stock-Based Compensation
Stock-based compensation primarily in4. REVENUE FROM CONTRACTS WITH CUSTOMERS
The Registrants generate revenues from a variety of sources, some of which are not accounted for as revenue from contracts with customers, such as leases, derivatives, and certain cost recovery mechanisms. See Note 1 under "Revenues" for additional information on the form of Southern Company performance share units and restricted stock units may be granted through the Omnibus Incentive Compensation Plan to a large segmentrevenue policies of the Company's employees ranging from line management to executives. In 2015Registrants. See Notes 9 and 2016, stock-based compensation consisted exclusively of performance share units. Beginning in 2017, stock-based compensation granted to employees includes restricted stock units in addition to performance share units. Prior to 2015, stock-based compensation also included stock options. As of December 31, 2017, there were 180 current14 for additional information on revenue accounted for under lease and former employees participating in the stock option, performance share unit, and restricted stock unit programs.
Performance Share Units
Performance share units granted to employees vest at the end of a three-year performance period. All unvested performance share units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of performance share units granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company issues performance share units with performance goals based on three performance goals to employees. These include performance share units with performance goals based on the total shareholder return (TSR) for Southern Company common stock during the three-year performance period as compared to a group of industry peers, performance share units with performance goals based on Southern Company's cumulative earnings per share (EPS) over the performance period, and performance share units with performance goals based on Southern Company's equity-weighted ROE over the performance period.
In 2015 and 2016, the EPS-based and ROE-based awards each represented 25% of the total target grant date fair value of the performance share unit awards granted. The remaining 50% of the total target grant date fair value consisted of TSR-based awards. Beginning in 2017, the total target grant date fair value of the stock compensation awards granted was comprised 20% each of EPS-based awards and ROE-based awards and 30% each of TSR-based awards and restricted stock units.derivative accounting guidance, respectively.
The fair value of TSR-based performance share unit awards is determined as of the grant date using a Monte Carlo simulation model to estimate the TSR of Southern Company's common stock among the industry peers over the performance period. The Company recognizes compensation expense on a straight-line basis over the three-year performance period without remeasurement.
The fair values of the EPS-based awards and the ROE-based awards are based on the closing stock price of Southern Company common stock on the date of the grant. Compensation expensefollowing table disaggregates revenue from contracts with customers for the EPS-based and ROE-based awards is generally recognized ratably over the three-year performance period initially assuming a 100% payout at the end of the performance period. Employees become immediately vested in the TSR-based performance share units, along with the EPS-based and ROE-based awards, upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. The expected payout related to the EPS-based and ROE-based awards is reevaluated annually with expense recognized to date increased or decreased based on the number of shares currently expected to be issued. Unlike the TSR-based awards, the compensation expense ultimately recognized for the EPS-based awards and the ROE-based awards will be based on the actual number of shares issued at the end of the performance period.periods presented:
For the years ended December 31, 2017, 2016, and 2015, employees of the Company were granted performance share units of 30,933, 62,435, and 53,909, respectively. The weighted average grant-date fair value of TSR-based performance share units granted during 2017, 2016, and 2015, determined using a Monte Carlo simulation model to estimate the TSR of Southern Company's stock among the industry peers over the performance period, was $49.24, $45.17, and $46.41, respectively. The weighted average grant-date fair value of both EPS-based and ROE-based performance share units granted during 2017, 2016, and 2015 was $49.22, $48.84, and $47.77, respectively.
For the years ended December 31, 2017, 2016, and 2015, total compensation cost for performance share units recognized in income was $2 million, $4 million, and $4 million, respectively, with the related tax benefit also recognized in income of $1 million, $1 million, and $2 million, respectively. The compensation cost related to the grant of Southern Company performance share units to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. As of December 31, 2017, total unrecognized compensation cost related to performance share award units was immaterial.
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Operating revenues
Retail electric revenues
Residential$7,309 $2,904 $4,105 $300 $ $ 
Commercial5,860 1,928 3,624 308   
Industrial3,613 1,721 1,558 334   
Other112 12 91 9   
Total retail electric revenues16,894 6,565 9,378 951   
Natural gas distribution revenues
Residential1,981     1,981 
Commercial505     505 
Transportation1,184     1,184 
Industrial45     45 
Other324     324 
Total natural gas distribution revenues4,039     4,039 
Wholesale electric revenues
PPA energy revenues1,107 234 87 20 790  
PPA capacity revenues624 156 51 45 376  
Non-PPA revenues250 65 35 407 409  
Total wholesale electric revenues1,981 455 173 472 1,575  
Other natural gas revenues
Gas marketing services528     528 
Other natural gas revenues31     31 
Total natural gas revenues559     559 
Other revenues1,355 213 578 39 55  
Total revenue from contracts with customers24,828 7,233 10,129 1,462 1,630 4,598 
Other revenue sources(a)
425 (183)(11)12 559 104 
Total operating revenues$25,253 $7,050 $10,118 $1,474 $2,189 $4,702 
II-163



COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Mississippi Power Company 2017 Annual Report

Restricted Stock Units
Beginning in 2017, stock-based compensation granted to employees included restricted stock units in addition to performance share units. One-third of the restricted stock units granted to employees vest each year throughout a three-year service period. All unvested restricted stock units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the vesting period.
The fair value of restricted stock units is based on the closing stock price of Southern Company common stock on the date of the grant. Since one-third of the restricted stock units vest each year throughout a three-year service period, compensation expense for restricted stock unit awards is generally recognized over the corresponding one-, two-, or three-year period. Employees become immediately vested in the restricted stock units upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility.
For the year ended December 31, 2017, employees of the Company were granted 13,260 restricted stock units. The weighted average grant-date fair value of restricted stock units granted during 2017 was $49.22.
For the year ended December 31, 2017, total compensation cost for restricted stock units and the related tax benefit also recognized in income was immaterial. As of December 31, 2017, total unrecognized compensation cost related to restricted stock units was immaterial.
Stock Options
In 2015, Southern Company discontinued the granting of stock options. Stock options expire no later than 10 years after the grant date and the latest possible exercise will occur no later than November 2024.
The compensation cost related to the grant of Southern Company stock options to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. Compensation cost and related tax benefits recognized in the Company's financial statements were not material for any year presented. As of December 31, 2017, all compensation cost related to stock option awards has been recognized.
The total intrinsic value of options exercised during the years ended December 31, 2017, 2016, and 2015 was $2 million, $4 million, and $3 million, respectively. No cash proceeds are received by the Company upon the exercise of stock options. The actual tax benefit realized by the Company for the tax deductions from stock option exercises totaled $1 million, $2 million, and $1 million for the years ended December 31, 2017, 2016, and 2015, respectively. Prior to the adoption of ASU 2016-09 in 2016, the excess tax benefits related to the exercise of stock options were recognized in the Company's financial statements with a credit to equity. Upon the adoption of ASU 2016-09, beginning in 2016, all tax benefits related to the exercise of stock options are recognized in income. As of December 31, 2017, the aggregate intrinsic value for the options outstanding and exercisable was $4 million.
9. FAIR VALUE MEASUREMENTS
Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement.
Level 1 consists of observable market data in an active market for identical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.
Level 3 consists of unobservable market data. The input may reflect the assumptions of the Company of what a market participant would use in pricing an asset or liability. If there is little available market data, then the Company's own assumptions are the best available information.
In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the level in the fair value hierarchy in which the fair value measurement is reported.
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2022
Operating revenues
Retail electric revenues
Residential$6,604 $2,638 $3,664 $302 $— $— 
Commercial5,369 1,685 3,385 299 — — 
Industrial3,764 1,507 1,921 336 — — 
Other102 14 79 — — 
Total retail electric revenues15,839 5,844 9,049 946 — — 
Natural gas distribution revenues
Residential2,843 — — — — 2,843 
Commercial763 — — — — 763 
Transportation1,186 — — — — 1,186 
Industrial84 — — — — 84 
Other342 — — — — 342 
Total natural gas distribution revenues5,218 — — — — 5,218 
Wholesale electric revenues
PPA energy revenues2,274 489 130 16 1,673 — 
PPA capacity revenues596 194 47 356 — 
Non-PPA revenues250 200 30 690 740 — 
Total wholesale electric revenues3,120 883 207 710 2,769 — 
Other natural gas revenues
Gas marketing services636 — — — — 636 
Other natural gas revenues51 — — — — 51 
Total other natural gas revenues687 — — — — 687 
Other revenues1,077 194 446 47 36 — 
Total revenue from contracts with customers25,941 6,921 9,702 1,703 2,805 5,905 
Other revenue sources(a)
3,338 896 1,882 (9)564 57 
Total operating revenues$29,279 $7,817 $11,584 $1,694 $3,369 $5,962 
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COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Mississippi Power Company 2017 Annual Report

Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2021
Operating revenues
Retail electric revenues
Residential$6,207 $2,467 $3,471 $269 $— $— 
Commercial4,877 1,600 3,010 267 — — 
Industrial3,067 1,386 1,391 290 — — 
Other93 17 68 — — 
Total retail electric revenues14,244 5,470 7,940 834 — — 
Natural gas distribution revenues
Residential1,799 — — — — 1,799 
Commercial470 — — — — 470 
Transportation1,038 — — — — 1,038 
Industrial49 — — — — 49 
Other269 — — — — 269 
Total natural gas distribution revenues3,625 — — — — 3,625 
Wholesale electric revenues
PPA energy revenues1,122 184 95 11 854 — 
PPA capacity revenues493 115 55 323 — 
Non-PPA revenues236 170 21 401 398 — 
Total wholesale electric revenues1,851 469 171 417 1,575 — 
Other natural gas revenues
Wholesale gas services2,168 — — — — 2,168 
Gas marketing services464 — — — — 464 
Other natural gas revenues36 — — — — 36 
Total other natural gas revenues2,668 — — — — 2,668 
Other revenues1,075 202 452 31 30 — 
Total revenue from contracts with customers23,463 6,141 8,563 1,282 1,605 6,293 
Other revenue sources(a)
3,349 272 697 40 611 1,786 
Other adjustments(b)
(3,699)— — — — (3,699)
Total operating revenues$23,113 $6,413 $9,260 $1,322 $2,216 $4,380 
As(a)Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues (including those related to fuel costs) that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies.
(b)Other adjustments relate to the cost of December 31, 2017, assetsSouthern Company Gas' energy and liabilities measured at fair value on a recurring basis during the period, together with their associated levelrisk management activities. Wholesale gas services revenues are presented net of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) Total
 (in millions)
Assets:       
Energy-related derivatives$
 $2
 $
 $2
Interest rate derivatives
 1
 
 1
Cash equivalents224
 
 
 224
Total$224
 $3
 $
 $227
Liabilities:       
Energy-related derivatives$
 $9
 $
 $9
Asrelated costs of December 31, 2016, assetsthose activities on the statement of income. See Notes 15 and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) Total
 (in millions)
Assets:       
Energy-related derivatives$
 $3
 $
 $3
Interest rate derivatives
 3
 
 3
Cash equivalents206
 
 
 206
Total$206
 $6
 $
 $212
Liabilities:       
Energy-related derivatives$
 $10
 $
 $10
Valuation Methodologies
The energy-related derivatives primarily consist of over-the-counter financial products16 under "Southern Company Gas" for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. See Note 10 for additional information on how these derivatives are used.the sale of Sequent and components of wholesale gas services' operating revenues, respectively.
II-165



COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Mississippi Power Company 2017 Annual Report

Contract Balances
AsThe following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at December 31, 20172023 and 2016, other financial instruments2022:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Accounts Receivable
At December 31, 2023$2,820 $821 $1,011 $90 $122 $684 
At December 31, 20223,123 696 922 92 237 1,107 
Contract Assets
At December 31, 2023$271 $$121 $— $— $56 
At December 31, 2022156 89 — — — 
Contract Liabilities
At December 31, 2023$116 $— $$— $$— 
At December 31, 202245 — — 
Contract assets for whichGeorgia Power primarily relate to retail customer fixed bill programs, where the carrying amount did not equal fair value were as follows:
 
Carrying
Amount
 
Fair
Value
 (in millions)
Long-term debt:   
2017$2,086
 $2,076
2016$2,979
 $2,922
The fair values are determined using Level 2 measurementspayment is contingent upon Georgia Power's continued performance and are based on quoted market prices for the same or similar issues or on the current rates offered to the Company.
10. DERIVATIVES
The Company is exposed to market risks, primarily commodity price risk and interest rate risk. To manage the volatility attributable to these exposures, the Company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair valuecustomer's continued participation in the balance sheets as either assets orprogram over a one-year contract term, and unregulated service agreements, where payment is contingent on project completion. Contract liabilities and are presented on a net basis. See Note 9 for additional information. In the statements ofGeorgia Power primarily relate to cash flows, the cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities.
Energy-Related Derivatives
The Company enters into energy-related derivatives to hedge exposures to electricity, gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the Company has limited exposure to market volatility in energy-related commodity prices. The Company manages fuel-hedging programs, implemented per the guidelines of the Mississippi PSC, through the use of financial derivative contracts, which is expected to continue to mitigate price volatility.
Energy-related derivative contracts are accounted for under one of the following methods:
Regulatory Hedges – Energy-related derivative contracts which are designated as regulatory hedges relate primarily to the Company's fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through the respective fuel cost recovery clauses.
Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges arecollections recognized in advance of revenue for unregulated service agreements. Southern Company Gas' contract assets relate to work performed on an energy efficiency enhancement and upgrade contract with the statementsU.S. General Services Administration. Southern Company Gas receives cash advances from a third-party financial institution to fund work performed, of operations as incurred.
Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric industry. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.
At which approximately $59 million had been received at December 31, 2017, the net volume of energy-related derivative contracts for natural gas positions totaled 53 million mmBtu for the Company, with the longest hedge date of 2021 over which the Company is hedging its exposure to the variability in future cash flows for forecasted transactions.
In addition to the volume discussed above, the Company enters into physical natural gas supply contracts that provide the option to sell back excess gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 4 million mmBtu.
Interest Rate Derivatives
The Company may also enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are2023. These advances have been accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or losses is recorded in OCI and is reclassified into earnings at the same time the hedged transactions affect earnings. The derivatives employed as hedging instruments are structured to minimize ineffectiveness, which is recorded directly to income.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

At December 31, 2017, the following interest rate derivatives were outstanding:
 Notional
Amount
 Interest
Rate
Received
 Weighted Average Interest
Rate Paid
 Hedge
Maturity
Date
 Fair Value
Gain (Loss)
December 31,
2017
 (in millions)       (in millions)
Cash Flow Hedges of Existing Debt$900
 1-month LIBOR 0.79% March 2018 $1
The estimated pre-tax losses that will be reclassified from accumulated OCI to interest expense for the next 12-month period ending December 31, 2018 are $0.5 million. The Company has deferred gains and losses that are expected to be amortized into earnings through 2022.
Derivative Financial Statement Presentation and Amounts
The Company enters into energy-related and interest rate derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Fair value amounts of derivative assets and liabilitieslong-term debt on the balance sheets are presented net tosheets. See Note 1 under "Affiliate Transactions" for additional information regarding the extent that there are netting arrangements or similar agreements with counterparties.
construction contract. At December 31, 20172023 and 2016,2022, Southern Company's unregulated distributed generation business had contract assets of $91 million and $65 million, respectively, and contract liabilities of $115 million and $32 million, respectively, for outstanding performance obligations.
Revenues recognized in 2023 and 2022, which were included in contract liabilities at December 31, 2023 and 2022, respectively, were $36 million annually for Southern Company and immaterial for the fair value of energy-related derivatives and interest rate derivatives was reflectedother Registrants. Contract liabilities are primarily classified as current on the balance sheets as follows:
 20172016
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
 (in millions)
Derivatives designated as hedging instruments for regulatory purposes    
Energy-related derivatives:    
Other current assets/Other current liabilities$1
$6
$2
$6
Other deferred charges and assets/Other deferred credits and liabilities1
3
2
5
Total derivatives designated as hedging instruments for regulatory purposes$2
$9
$4
$11
Derivatives designated as hedging instruments in cash flow and fair value hedges    
Interest rate derivatives:    
Other current assets/Other current liabilities$1
$
$2
$
Other deferred charges and assets/Other deferred credits and liabilities

1

Total derivatives designated as hedging instruments in cash flow and fair value hedges$1
$
$3
$
Gross amounts recognized$3
$9
$7
$11
Gross amounts offset$(2)$(2)$(3)$(3)
Net amounts recognized in the Balance Sheets$1
$7
$4
$8
Energy-related derivatives not designated as hedging instruments were immaterial for 2017 and 2016.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

At December 31, 2017 and 2016, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivatives designated as regulatory hedging instruments and deferred were as follows:
 Unrealized Losses Unrealized Gains
Derivative Category
Balance Sheet
Location
2017 2016 
Balance Sheet
Location
2017 2016
  (in millions)  (in millions)
Energy-related derivatives:Other regulatory assets, current$(5) $(5) Other current liabilities$
 $1
 Other regulatory assets, deferred(2) (3) Other regulatory liabilities, deferred
 
Total energy-related derivative gains (losses) $(7) $(8)  $
 $1
For all years presented, the pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of operations were immaterial.
For the years ended December 31, 2017, 2016, and 2015, the pre-tax effects of derivatives designated as cash flow hedging instruments on the statements of operations were immaterial.
Contingent Features
The Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain affiliated companies. At December 31, 2017, the Company had no collateral posted with its derivative counterparties.
At December 31, 2017, the fair value of derivative liabilities with contingent features was $1 million. However, because of joint and several liability features underlying these derivatives, the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were $12 million, and include certain agreements that could require collateral in the event that one or more Southern Company system power pool participants has a credit rating change to below investment grade.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. If collateral is required, fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty.
The Company is exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Company has also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk. Therefore, the Company does not anticipate a material adverse effect on the financial statements as a result of counterparty nonperformance.

NOTES (continued)
Mississippi Power Company 2017 Annual Report

11. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Summarized quarterly financial information for 2017 and 2016 is as follows:
Quarter Ended
Operating
Revenues
 
Operating
Income (Loss)
 Net Income (Loss) After Dividends on Preferred Stock
 (in millions)
March 2017$272
 $(62) $(20)
June 2017303
 (2,954) (2,054)
September 2017341
 51
 40
December 2017271
 (177) (556)
      
March 2016$257
 $(10) $11
June 2016277
 (28) 2
September 2016352
 9
 26
December 2016277
 (166) (89)
As a result of the revisions to the cost estimate for the Kemper IGCC and its June 2017 suspension, the Company recorded total pre-tax charges to income related to the Kemper IGCC of $208 million ($185 million after tax) in the fourth quarter 2017, $34 million ($21 million after tax) in the third quarter 2017, $3.0 billion ($2.1 billion after tax) in the second quarter 2017, $108 million ($67 million after tax) in the first quarter 2017, $206 million ($127 million after tax) in the fourth quarter 2016, $88 million ($54 million after tax) in the third quarter 2016, $81 million ($50 million after tax) in the second quarter 2016, and $53 million ($33 million after tax) in the first quarter 2016. See Note 3 under "Kemper County Energy Facility" for additional information.
As a result of Tax Reform Legislation, the Company recorded total income tax expense of $372 million in the fourth quarter 2017. See Note 5 for additional information.
The Company's business is influenced by seasonal weather conditions.

SELECTED FINANCIAL AND OPERATING DATA 2013-2017
Mississippi Power Company 2017 Annual Report
 2017 2016 2015 2014 2013
Operating Revenues (in millions)$1,187
 $1,163
 $1,138
 $1,243
 $1,145
Net Income (Loss) After Dividends
on Preferred Stock (in millions)(a)
$(2,590) $(50) $(8) $(329) $(477)
Cash Dividends
on Common Stock (in millions)
$
 $
 $
 $
 $72
Return on Average Common Equity (percent)(a)
(120.43) (1.87) (0.34) (15.43) (24.28)
Total Assets (in millions)(b)(c)
$4,866
 $8,235
 $7,840
 $6,642
 $5,822
Gross Property Additions (in millions)$536
 $946
 $972
 $1,389
 $1,773
Capitalization (in millions):         
Common stock equity$1,358
 $2,943
 $2,359
 $2,084
 $2,177
Redeemable preferred stock33
 33
 33
 33
 33
Long-term debt(b)
1,097
 2,424
 1,886
 1,621
 2,157
Total (excluding amounts due within one year)$2,488
 $5,400
 $4,278
 $3,738
 $4,367
Capitalization Ratios (percent):         
Common stock equity54.6
 54.5
 55.1
 55.8
 49.9
Redeemable preferred stock1.3
 0.6
 0.8
 0.9
 0.7
Long-term debt(b)
44.1
 44.9
 44.1
 43.3
 49.4
Total (excluding amounts due within one year)100.0
 100.0
 100.0
 100.0
 100.0
Customers (year-end):         
Residential153,115
 153,172
 153,158
 152,453
 152,585
Commercial33,992
 33,783
 33,663
 33,496
 33,250
Industrial452
 451
 467
 482
 480
Other173
 175
 175
 175
 175
Total187,732
 187,581
 187,463
 186,606
 186,490
Employees (year-end)1,242
 1,484
 1,478
 1,478
 1,344
(a)A significant loss to income was recorded by the Company related to the suspension of the Kemper IGCC in June 2017. Earnings in all periods presented were impacted by losses related to the Kemper IGCC.
(b)A reclassification of debt issuance costs from Total Assets to Long-term debt of $9 million and $11 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(c)A reclassification of deferred tax assets from Total Assets of $105 million and $16 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.


SELECTED FINANCIAL AND OPERATING DATA 2013-2017 (continued)
Mississippi Power Company 2017 Annual Report
 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions):         
Residential$257
 $260
 $238
 $239
 $242
Commercial285
 279
 256
 257
 266
Industrial321
 313
 287
 291
 289
Other(9) 7
 (5) 8
 2
Total retail854
 859
 776
 795
 799
Wholesale — non-affiliates259
 261
 270
 323
 294
Wholesale — affiliates56
 26
 76
 107
 35
Total revenues from sales of electricity1,169
 1,146
 1,122
 1,225
 1,128
Other revenues18
 17
 16
 18
 17
Total$1,187
 $1,163
 $1,138
 $1,243
 $1,145
Kilowatt-Hour Sales (in millions):         
Residential1,944
 2,051
 2,025
 2,126
 2,088
Commercial2,764
 2,842
 2,806
 2,860
 2,865
Industrial4,841
 4,906
 4,958
 4,943
 4,739
Other39
 39
 40
 40
 40
Total retail9,588
 9,838
 9,829
 9,969
 9,732
Wholesale — non-affiliates3,672
 3,920
 3,852
 4,191
 3,929
Wholesale — affiliates2,024
 1,108
 2,807
 2,900
 931
Total15,284
 14,866
 16,488
 17,060
 14,592
Average Revenue Per Kilowatt-Hour (cents)(*):
         
Residential13.22
 12.68
 11.75
 11.26
 11.59
Commercial10.31
 9.82
 9.12
 8.99
 9.27
Industrial6.63
 6.38
 5.79
 5.89
 6.10
Total retail8.91
 8.73
 7.90
 7.97
 8.21
Wholesale5.53
 5.71
 5.20
 6.06
 6.76
Total sales7.65
 7.71
 6.80
 7.18
 7.73
Residential Average Annual
Kilowatt-Hour Use Per Customer
12,692
 13,383
 13,242
 13,934
 13,680
Residential Average Annual
Revenue Per Customer
$1,680
 $1,697
 $1,556
 $1,568
 $1,585
Plant Nameplate Capacity
Ratings (year-end) (megawatts)
3,628
 3,481
 3,561
 3,867
 3,088
Maximum Peak-Hour Demand (megawatts):         
Winter2,390
 2,195
 2,548
 2,618
 2,083
Summer2,322
 2,384
 2,403
 2,345
 2,352
Annual Load Factor (percent)63.1
 64.0
 60.6
 59.4
 64.7
Plant Availability Fossil-Steam (percent)89.1
 91.4
 90.6
 87.6
 89.3
Source of Energy Supply (percent):         
Coal7.5
 8.0
 16.5
 39.7
 32.7
Oil and gas88.0
 84.9
 81.6
 55.3
 57.1
Purchased power —         
From non-affiliates0.5
 (0.3) 0.4
 1.4
 2.0
From affiliates4.0
 7.4
 1.5
 3.6
 8.2
Total100.0
 100.0
 100.0
 100.0
 100.0
(*)The average revenue per kilowatt-hour (cents) is based on booked operatingcorresponding revenues and will not match billed revenue per kilowatt-hour.


SOUTHERN POWER COMPANY
FINANCIAL SECTION


MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Southern Power Company and Subsidiary Companies 2017 Annual Report
The management of Southern Power Company (the Company) is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of the Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that the Company's internal control over financial reporting was effective as of December 31, 2017.

/s/ Joseph A. Miller
Joseph A. Miller
Chairman, President, and Chief Executive Officer

/s/ William C. Grantham
William C. Grantham
Senior Vice President, Chief Financial Officer, and Treasurer
February 20, 2018


REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Southern Power Company and Subsidiary Companies
Opinion on the Financial Statements
We have audited the accompanying consolidated balance sheets of Southern Power Company and Subsidiary Companies (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2017, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements (pages II-508 to II-542) present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018
We have served as the Company's auditor since 2002.

DEFINITIONS
TermMeaning
Alabama PowerAlabama Power Company
AOCIAccumulated other comprehensive income
ASCAccounting Standards Codification
ASUAccounting Standards Update
CO2
Carbon dioxide
CODCommercial operation date
CWIPConstruction work in progress
EPAU.S. Environmental Protection Agency
FASBFinancial Accounting Standards Board
FERCFederal Energy Regulatory Commission
GAAPU.S. generally accepted accounting principles
Georgia PowerGeorgia Power Company
Gulf PowerGulf Power Company
IRSInternal Revenue Service
ITCInvestment tax credit
KWHKilowatt-hour
LTSALong-term service agreement
Mississippi PowerMississippi Power Company
mmBtuMillion British thermal units
Moody'sMoody's Investors Service, Inc.
MWMegawatt
MWHMegawatt hour
NOX
Nitrogen oxide
OCIOther comprehensive income
power poolThe operating arrangement whereby the integrated generating resources of the traditional electric operating companies and Southern Power (excluding subsidiaries) are subject to joint commitment and dispatch in order to serve their combined load obligations
PPAPower purchase agreements, as well as contracts for differences that provide the owner of a renewable facility a certain fixed price for the electricity sold to the grid
PTCProduction tax credit
S&PS&P Global Ratings, a division of S&P Global Inc.
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECU.S. Securities and Exchange Commission
SO2
Sulfur dioxide
Southern CompanyThe Southern Company
Southern Company GasSouthern Company Gas and its subsidiaries
Southern Company systemSouthern Company, the traditional electric operating companies, Southern Power Company, Southern Company Gas (as of July 1, 2016), Southern Electric Generating Company, Southern Nuclear, SCS, Southern Linc, PowerSecure, Inc. (as of May 9, 2016), and other subsidiaries
Southern LincSouthern Communications Services, Inc.
Southern NuclearSouthern Nuclear Operating Company, Inc.
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
traditional electric operating companiesAlabama Power, Georgia Power, Gulf Power, and Mississippi Power

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Southern Power Company and Subsidiary Companies 2017 Annual Report
OVERVIEW
Business Activities
Southern Power Company and its subsidiaries (the Company) develop, construct, acquire, own, and manage power generation assets, including renewable energy projects, and sell electricity at market-based rates in the wholesale market. The Company continually seeks opportunities to execute its strategy to create value through various transactions including acquisitions and sales of assets, development and construction of new generating facilities, and entry into PPAs primarily with investor-owned utilities, independent power producers, municipalities, electric cooperatives, and other load-serving entities, as well as commercial and industrial customers. In general, the Company has committed to the construction or acquisition of new generating capacity only after entering into or assuming long-term PPAs for the new facilities.
During 2017, the Company acquired or commenced construction of approximately 424 MWs of additional wind facilities and completed construction of, and placed in service, approximately 222 MWs of solar facilities. In addition, the Company continued development of its portfolio of wind projects and continued expansion of the 345-MW Mankato natural gas facility. Subsequent to December 31, 2017, the Company acquired Gaskell West 1, which is an approximately 20-MW solar facility. See FUTURE EARNINGS POTENTIAL – "Acquisitions" and "Construction Projects" herein for additional information.
As of December 31, 2017, the Company's generation fleet totaled 12,940 MWs of nameplate capacity in commercial operation (including 5,152 MWs owned by its subsidiaries). The average remaining duration of the Company's total portfolio of wholesale contracts is approximately 15 years, which reduces remarketing risk for the Company. With the inclusion of the PPAs and investments associated with renewable and natural gas facilities currently under construction and acquired subsequent to December 31, 2017, the Company has an average investment coverage ratio of 91% through 2022 and 89% through 2027.
The Company is pursuing the sale of a 33% equity interest in a newly-formed holding company that owns substantially all of the Company's solar assets, which, if successful, is expected to close in the middle of 2018. The ultimate outcome of this matter cannot be determined at this time.
The Company's future earnings will depend on the parameters of the wholesale market and the efficient operation of its wholesale generating assets, as well as the Company's ability to execute its growth strategy and to develop and construct generating facilities. In addition, the Company's earnings may be impacted by the availability of federal and state solar ITCs and wind PTCs on its renewable energy projects, which could be impacted by current or future potential tax reform legislation. See FUTURE EARNINGS POTENTIAL – "Acquisitions," "Construction Projects," and "Income Tax Matters" herein for additional information.
Effective in December 2017, 538 employees transferred from SCS to the Company. The Company became obligated for related employee costs including pension, other postretirement benefits, and stock-based compensation and has recognized the respective balance sheet assets and liabilities, including AOCI impacts, in its balance sheet at December 31, 2017. Prior to the transfer of employees, the Company's agreements with SCS provided for employee services rendered at amounts in compliance with FERC regulations.
To evaluate operating results and to ensure the Company's ability to meet its contractual commitments to customers, the Company continues to focus on several key performance indicators, including, but not limited to, peak season equivalent forced outage rate, contract availability, and net income.
See RESULTS OF OPERATIONS herein for information on the Company's financial performance.
Earnings
The Company's 2017 net income was $1.1 billion, a $733 million increase from 2016, primarily attributable to $743 million related to the Tax Reform Legislation. Also contributing to the change were increases in operating expenses and interest expense related to the Company's growth strategy and continuous construction program, largely offset by increased renewable energy sales.
The Company's 2016 net income was $338 million, a $123 million, or 57%, increase from 2015. The increase was primarily due to increased federal income tax benefits from solar ITCs and wind PTCs and increased renewable energy sales, partially offset by increases in depreciation, operations and maintenance expenses, and interest expense from debt issuances, primarily related to new solar and wind facilities.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Benefits from solar ITCs, related to the Company's acquisition and construction of new facilities, and wind PTCs, related to wind generation, significantly impacted the Company's net income in 2017 and 2016. The Company's net income in 2015 was also significantly impacted by solar ITCs. See Note 5 to the financial statements under "Effective Tax Rate" for additional information.
RESULTS OF OPERATIONS
A condensed statement of income follows:
 Amount 
Increase (Decrease)
from Prior Year
 2017 2017 2016
 (in millions)
Operating revenues$2,075
 $498
 $187
Fuel621
 165
 15
Purchased power149
 47
 9
Other operations and maintenance386
 32
 94
Depreciation and amortization503
 151
 104
Taxes other than income taxes48
 25
 1
Total operating expenses1,707
 420
 223
Operating income368
 78
 (36)
Interest expense, net of amounts capitalized191
 74
 40
Other income (expense), net1
 (5) 5
Income taxes (benefit)(939) (744) (216)
Net income1,117
 743
 145
Less: Net income attributable to noncontrolling interests46
 10
 22
Net income attributable to the Company$1,071
 $733
 $123
Operating Revenues
Total operating revenues include PPA capacity revenues, which are derived primarily from long-term contracts involving natural gas and biomass generating facilities, and PPA energy revenues from the Company's generation facilities. To the extent the Company has capacity not contracted under a PPA, it may sell power into the wholesale market and, to the extent the generation assets are part of the Intercompany Interchange Contract (IIC), as approved by the FERC, it may sell power into the power pool.
Natural Gas and Biomass Capacity and Energy Revenue
Capacity revenues generally represent the greatest contribution to net income and are designed to provide recovery of fixed costs plus a return on investment.
Energy is generally sold at variable cost or is indexed to published natural gas indices. Energy revenues will vary depending on the energy demand of the Company's customers and their generation capacity, as well as the market prices of wholesale energy compared to the cost of the Company's energy. Energy revenues also include fees for support services, fuel storage, and unit start charges. Increases and decreases in energy revenues under PPAs that are driven by fuel or purchased power prices are accompanied by an increase or decrease in fuel and purchased power costs and do not have a significant impact on net income.
Solar and Wind Energy Revenue
The Company's energy sales from solar and wind generating facilities are predominantly through long-term PPAs that do not have a capacity charge. Customers either purchase the energy output of a dedicated renewable facility through an energy charge or pay a fixed price related to the energy sold to the grid. As a result, the Company's ability to recover fixed and variable operations and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors.
See FUTURE EARNINGS POTENTIAL – "Power Sales Agreements" herein for additional information regarding the Company's PPAs.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Details of the Company's operating revenues were as follows:
 2017 2016 2015
   (in millions)  
PPA capacity revenues$599
 $541
 $569
PPA energy revenues970
 694
 560
Total PPA revenues1,569
 1,235
 1,129
Non-PPA revenues494
 330
 252
Other revenues12
 12
 9
Total operating revenues$2,075
 $1,577
 $1,390
Operating revenues for 2017 were $2.1 billion, reflecting a $498 million, or 32%, increase from 2016. The increase in operating revenues was primarily due to the following:
PPA capacity revenuesincreased $58 million, or 11%, primarily due to additional customer capacity requirements, and a new PPA related to the Mankato natural gas facility acquired in late 2016.
PPA energy revenues increased $276 million, or 40%, primarily due to a $213 million increase in renewable energy sales arising from new solar and wind facilities and a $50 million increase in sales from existing natural gas PPAs primarily due to an $85 million increase in the average cost of fuel, partially offset by a $35 million decrease in the volume of KWHs sold primarily due to reduced customer load.
Non-PPA revenues increased $164 million, or 50%, primarily due to a $156 million increase in the volume of KWHs sold primarily from uncovered natural gas capacity through short-term opportunity sales, as well as an $8 million increase in the price of energy in the wholesale markets.
Operating revenues for 2016 were $1.6 billion, reflecting a $187 million, or 13%, increase from 2015. The increase in operating revenues was primarily due to the following:
PPA capacity revenuesdecreased $28 million as a result of a $44 million decrease in non-affiliate capacity revenues primarily as a result of PPA expirations and subsequent generation capacity remarketing into the short-term markets, partially offset by a $16 million increase in affiliate capacity revenues due to new PPAs.
PPA energy revenues increased $134 million primarily due to a $170 million increase in renewable energy sales arising from new solar and wind facilities, partially offset by a decrease of $36 million in fuel revenues related to natural gas PPAs. Overall, total KWH sales under PPAs increased 7% in 2016 when compared to 2015.
Non-PPA revenues increased $78 million primarily due to a 23% increase in KWH sales. Underlying this increase was a $113 million increase in short-term sales to non-affiliates as a result of remarketing generation capacity from expired PPAs, partially offset by a $35 million decrease in power pool sales primarily associated with a reduction in capacity available for sale.
Fuel and Purchased Power Expenses
Fuel costs constitute one of the largest expenses for the Company. In addition, the Company purchases a portion of its electricity needs from the wholesale market including the power pool. Details of the Company's generation and purchased power were as follows:
 Total
KWHs
Total KWH % ChangeTotal
KWHs
Total KWH % Change
 2017 2016 
 (in billions of KWHs)
Generation44 37 
Purchased power5 3 
Total generation and purchased power4923%4014%
Total generation and purchased power, excluding solar, wind, and tolling agreements2822%2310%

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

The Company's PPAs for natural gas and biomass generation generally provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing the Company for substantially all of the cost of fuel relating to the energy delivered under such PPAs. Consequently, changes in such fuel costs are generally accompanied by a corresponding change in related fuel revenues and do not have a significant impact on net income. The Company is responsible for the cost of fuel for generating units that are not covered under PPAs. Power from these generating units is sold into the wholesale market or into the power pool for capacity owned directly by the Company.
Purchased power expenses will vary depending on demand, availability, and the cost of generating resources throughout the Southern Company system and other contract resources. Load requirements are submitted to the power pool on an hourly basis and are fulfilled with the lowest cost alternative, whether that is generation owned by the Company, an affiliate company, or external parties. Such purchased power costs are generally recovered through PPA revenues.
Details of the Company's fuel and purchased power expenses were as follows:
 2017 2016 2015
   (in millions)  
Fuel$621
 $456
 $441
Purchased power149
 102
 93
Total fuel and purchased power expenses$770
 $558
 $534
In 2017, total fuel and purchased power expenses increased $212 million, or 38%, compared to 2016. Fuel expenseincreased $165 million, or 36%, primarily due to an $83 million increase associated with the volume of KWHs generated and an $82 million increase associated with the average cost of natural gas per KWH generated. Purchased power expense increased $47 million, or 46%, primarily due to a $37 million increase associated with the volume of KWHs purchased and an $11 million increase associated with the average cost of purchased power.
In 2016, total fuel and purchased power expenses increased $24 million, or 4%, compared to 2015. Fuel expenseincreased $15 million, or 3%, primarily due to a $22 million increase associated with the volume of KWHs generated, partially offset by a $7 million decrease associated with the average cost of natural gas per KWH generated. Purchased power expense increased $9 million, or 10%, primarily due to a $53 million increase associated with the volume of KWHs purchased, partially offset by a $28 million decrease associated with the average cost of purchased power and a $16 million decrease associated with a PPA expiration.
Other Operations and Maintenance Expenses
In 2017, other operations and maintenance expenses increased $32 million, or 9%, compared to 2016. The increase was primarily due to increases of $56 million associated with new facilities, $21 million in business development and support expenses, and $6 million in employee compensation, all associated with the Company's overall growth. These increases were partially offset by decreases of $35 million associated with scheduled outage and maintenance expenses and $15 million in non-outage operations and maintenance expenses.
In 2016, other operations and maintenance expenses increased $94 million, or 36%, compared to 2015. The increase was primarily due to increases of $35 million associated with new plants placed in service in 2015 and 2016, $25 million associated with scheduled outage and maintenance expenses, and $21 million in business development and support expenses and $13 million in employee compensation all primarily associated with the Company's overall growth.
Depreciation and Amortization
In 2017, depreciation and amortization increased $151 million, or 43%, compared to 2016. In 2016, depreciation and amortization increased $104 million, or 42%, compared to 2015. These increases were primarily due to additional depreciation related to new solar, wind, and natural gas facilities placed in service. See Note 1 to the financial statements under "Depreciation" for additional information.
Taxes Other Than Income Taxes
In 2017, taxes other than income taxes were $48 million compared to $23 million in 2016. In 2016, taxes other than income taxes increased $1 million, or 5%, compared to 2015. The increases were primarily due to additional property taxes due to new facilities.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Interest Expense, Net of Amounts Capitalized
In 2017, interest expense, net of amounts capitalized increased $74 million, or 63%, compared to 2016. The increase was primarily due to an increase of $44 million in interest expense related to an increase in average outstanding long-term debt, primarily to fund the Company's growth strategy and continuous construction program, as well as a $30 million decrease in capitalized interest associated with completing construction of and placing in service solar facilities.
In 2016, interest expense, net of amounts capitalized increased $40 million, or 52%, compared to 2015. The increase was primarily due to an increase of $66 million in interest expense related to additional debt issued during 2016 primarily to fund the Company's growth strategy and continuous construction program, partially offset by a $26 million increase in capitalized interest associated with the construction of solar facilities.
Other Income (Expense), Net
In 2017, other income (expense), net decreased $5 million, or 83%, compared to 2016. In 2016, other income (expense), net increased $5 million compared to 2015. For 2017, the amount includes $159 million from currency losses compared to $82 million from currency gains in 2016, arising from translation of €1.1 billion euro-denominated fixed-rate notes into U.S. dollars, each fully offset by an equal amount on the foreign currency hedges that were reclassified from accumulated OCI into earnings. See Note 9 to the financial statements under "Foreign Currency Derivatives" for additional information regarding hedging.
Income Taxes (Benefit)
In 2017, income tax benefit was $939 million compared to $195 million for 2016 of which $743 million is related to the Tax Reform Legislation under which the Company remeasured its accumulated deferred income taxes based on the new federal income tax rates. The remaining increase in tax benefit was primarily due to an increase of $89 million in PTCs from wind generation in 2017 and other state income taxes, significantly offset by a decrease in tax benefits from lower ITCs from solar plants placed in service.
In 2016, income tax benefit was $195 million compared to an expense of $21 million for 2015. The $216 million change was primarily due to an increase of $180 million in federal income tax benefits related to ITCs for solar plants placed in service and PTCs from wind generation in 2016 and a $35 million decrease in tax expense related to lower pre-tax earnings in 2016.
See FUTURE EARNINGS POTENTIAL – "Income Tax MattersFederal Tax Reform Legislation" herein and Note 1 to the financial statements under "Income and Other Taxes" for information on how the Company recognizes the tax benefits related to federal ITCs and PTCs and Note 5 to the financial statements under "Effective Tax Rate" for additional information.
Effects of Inflation
The Company is party to long-term contracts reflecting market-based rates, including inflation expectations. Any adverse effect of inflation on the Company's results of operations has not been substantial in recent years.
FUTURE EARNINGS POTENTIAL
General
The results of operations for the past three years are not necessarily indicative of the Company's future earnings potential. The level of the Company's future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Company's competitive wholesale business. These factors include: the Company's ability to achieve sales growth while containing costs; regulatory matters; creditworthiness of customers; total generating capacity available in the Company's market areas; the successful remarketing of capacity as current contracts expire; the Company's ability to execute its growth strategy, including successful additional investments in renewable and other energy projects, and to develop and construct generating facilities.
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018, which among other things, reduces the federal corporate income tax rate to 21% and changes rates of depreciation and the business interest deduction. See "Income Tax Matters" and FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Note 5 to the financial statements for additional information.
In September 2017, the Company began a legal entity reorganization of various direct and indirect subsidiaries that own and operate substantially all of the solar facilities, including certain subsidiaries owned in partnership with various third parties. The reorganization is expected to be substantially completed in the first quarter 2018. The Company is pursuing the sale of a 33% equity interest in the newly-formed holding company owning these solar assets, which, if successful, is expected to close in the middle of 2018. The ultimate outcome of this matter cannot be determined at this time.recognized within one year.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Demand for electricity is primarily driven by the pace of economic growth that may be affected by changes in regional and global economic conditions, as well as renewable portfolio standards, which may impact future earnings. Other factors that could influence future earnings include weather, transmission constraints, cost of generation from units within the power pool, and operational limitations.
Power Sales Agreements
GeneralRemaining Performance Obligations
The Company has PPAsSubsidiary Registrants may enter into long-term contracts with some of Southern Company's traditional electric operating companies, other investor-owned utilities, independent power producers, municipalities, and other load-serving entities,customers in which revenues are recognized as well as commercial and industrial customers. The PPAsperformance obligations are expected to provide the Company with a stable source of revenue during their respective terms.
Many of the Company's PPAs have provisions that require the Company or the counterparty to post collateral or an acceptable substitute guarantee in the event that S&P or Moody's downgrades the credit ratings of the respective company to an unacceptable credit rating or if the counterparty is not rated or fails to maintain a minimum coverage ratio. See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein for additional information.
The Company is working to maintain and expand its share of the wholesale markets. The Company expects there to be new demand for capacity that will develop in the 2018-2020 timeframe. The size of available demand and timing will vary across the wholesale markets. The Company calculates an investment coverage ratio for its generating assets based on the ratio of investment under contract to total investment using the respective generation facilities' net book value (or expected in-service value for facilities under construction or being acquired) as the investment amount. With the inclusion of the PPAs and investments associated with the wind and natural gas facilities currently under construction and the Gaskell West 1 solar facility which was acquired subsequent to December 31, 2017, as well as other capacity and energy contracts, the Company has an average investment coverage ratio of 91% through 2022 and 89% through 2027, with an average remaining contract duration of approximately 15 years. See "Acquisitions" and "Construction Projects" herein for additional information.
Natural Gas and Biomass
The Company's electricity sales from natural gas and biomass generating units are primarily through long-term PPAs that consist of two types of agreements. The first type, referred to as a unit or block sale, is a customer purchase from a dedicated generating unit where all or a portion of the generation from that unit is reserved for that customer. The Company typically has the ability to serve the unit or block sale customer from an alternate resource. The second type, referred to as requirements service, provides that the Company serve the customer's capacity and energy requirements from a combination of the customer's own generating units and from Company resources not dedicated to serve unit or block sales. The Company has rights to purchase power provided by the requirements customers' resources when economically viable.
As a general matter, substantially all of the PPAs provide that the purchasers are responsible for either procuring the fuel (tolling agreements) or reimbursing the Company for substantially all of the cost of fuel or purchased power relating to the energy delivered under such PPAs. To the extent a particular generating facility does not meet the operational requirements contemplated in the PPAs, the Company may be responsible for excess fuel costs. With respect to fuel transportation risk, most of the Company's PPAs provide that the counterparties are responsible for the availability of fuel transportation to the particular generating facility.
Capacity charges that form part of the PPA payments are designed to recover fixed and variable operation and maintenance costs based on dollars-per-kilowatt year. In general, to reduce the Company's exposure to certain operation and maintenance costs, the Company has LTSAs. See Note 1 to the financial statements under "Long-Term Service Agreements" for additional information.
Solar and Wind
The Company's electricity sales from solar and wind (renewables) generating facilities are also made pursuant to long-term PPAs; however, these solar and wind PPAs do not have a capacity charge and customers either purchase the energy output of a dedicated renewable facility through an energy charge or provide the Company a certain fixed price for the electricity sold to the grid. As a result, the Company's ability to recover fixed and variable operation and maintenance expenses is dependent upon the level of energy generated from these facilities, which can be impacted by weather conditions, equipment performance, transmission constraints, and other factors. Generally, under the solar and wind generation PPAs, the purchasing party retains the right to keep or resell the renewable energy credits.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Environmental Matters
The Company's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, and protection of other natural resources. The Company maintains a comprehensive environmental compliance strategy to assess upcoming requirements and compliance costs associated with these environmental laws and regulations. The costs, including capital expenditures and operations and maintenance costs, required to comply with environmental laws and regulations may impact results of operations, cash flows, and financial condition. Compliance costs may result from the installation of additional environmental controls. The ultimate impact of the environmental laws and regulations discussed below will depend on various factors, such as state adoption and implementation of requirements, the availability and cost of any deployed control technology, and the outcome of pending and/or future legal challenges.
New or revised environmental laws and regulations could affect many areas of the Company's operations. The Company's PPAs generally contain provisions that permit charging the counterparty with some of the new costs incurred as a result of changes in environmental laws and regulations.
Since the Company's units are newer natural gas and renewable generating facilities, costs associated with environmental compliance for these facilities have been less significant than for similarly situated coal or older natural gas generating facilities. Environmental, natural resource, and land use concerns, including the applicability of air quality limitations, the potential presence of wetlands or threatened and endangered species, the availability of water withdrawal rights, uncertainties regarding aesthetic impacts such as increased light or noise, and concerns about potential adverse health impacts can, however, increase the cost of siting and operating any type of future electric generating facility. The impact of such laws and regulations on the Company and subsequent recovery through PPA provisions cannot be determined at this time.
Environmental Laws and Regulations
Air Quality
In 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) and its NOX annual, NOX seasonal, and SO2 annual programs. CSAPR is an emissions trading program that addresses the impacts of the interstate transport of SO2 and NOX emissions from fossil fuel-fired power plants located in upwind states in the eastern half of the U.S. on air quality in downwind states. The Company has fossil fuel-fired generation subject to these requirements. In October 2016, the EPA published a final rule that revised the CSAPR seasonal NOX program, establishing more stringent NOX emissions budgets in Alabama and Texas. The EPA also removed North Carolina from the CSAPR NOX seasonal program and completely removed Florida from all CSAPR programs. Georgia's seasonal NOX budget remains unchanged. Increases in either future fossil fuel-fired generation or the cost of CSAPR allowances could have a negative financial impact on results of operations for the Company.
In 2015, the EPA published a final rule requiring certain states (including Alabama, Florida, Georgia, North Carolina, and Texas) to revise or remove the provisions of their state implementation plans (SIP) regulating excess emissions at industrial facilities, including electric generating facilities, during periods of startup, shut-down, or malfunction (SSM). The state excess emission rules provide necessary operational flexibility to affected units during periods of SSM and, if removed, could affect unit availability and result in increased operations and maintenance costs for the Company.
Water Quality
In 2014, the EPA finalized requirements under Section 316(b) of the Clean Water Act (CWA) to regulate cooling water intake structures at existing power plants and manufacturing facilities in order to minimize their effects on fish and other aquatic life. The regulation requires plant-specific studies to determine applicable measures to protect organisms that either get caught on the intake screens (impingement) or are drawn into the cooling system (entrainment). The ultimate impact of this rule will depend on the outcome of these plant-specific studies and any additional protective measures required to be incorporated into each plant's National Pollutant Discharge Elimination System (NPDES) permit based on site-specific factors.
In 2015, the EPA finalized the steam electric effluent limitations guidelines (ELG) rule that set national standards for wastewater discharges from steam electric generating units. The rule prohibits effluent discharges of certain wastestreams and imposes stringent arsenic, mercury, selenium, and nitrate/nitrite limits on scrubber wastewater discharges. The revised technology-based limits and compliance dates may require extensive modifications to existing wastewater management systems or the installation and operation of new wastewater management systems. Compliance with the ELG rule is expected to require capital expenditures and increased operational costs. Compliance applicability dates range from November 1, 2018 to December 31, 2023 with state environmental agencies' incorporating specific applicability dates in the NPDES permitting process based on information provided for each waste stream. The EPA has committed to a new rulemaking that could potentially revise the limitations and applicability dates of the ELG rule. The EPA expects to finalize this rulemaking in 2020.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) jointly published a final rule that revised the regulatory definition of waters of the United States (WOTUS) for all CWA programs. The rule significantly expanded the scope of federal jurisdiction over waterbodies (such as rivers, streams, and canals), which could impact new generation projects. On July 27, 2017, the EPA and the Corps proposed to rescind the 2015 WOTUS rule. The WOTUS rule has been stayed by the U.S. Court of Appeals for the Sixth Circuit since late 2015, but on January 22, 2018, the U.S. Supreme Court determined that federal district courts have jurisdictionsatisfied over the pending challenges to the rule. On February 6, 2018, the EPA and the Corps published a final rule delaying implementation of the 2015 WOTUS rule to 2020.
Global Climate Issues
In 2015, the EPA published final rules limiting CO2 emissions from new, modified, and reconstructed fossil fuel-fired electric generating units and guidelines for states to develop plans to meet EPA-mandated CO2 emission performance standards for existing units (known as the Clean Power Plan or CPP). In February 2016, the U.S. Supreme Court granted a stay of the CPP, which will remain in effect through the resolution of litigation in the U.S. Court of Appeals for the District of Columbia challenging the legality of the CPP and any review by the U.S. Supreme Court. On March 28, 2017, the U.S. President signed an executive order directing agencies to review actions that potentially burden the development or use of domestically produced energy resources, including review of the CPP and other CO2 emissions rules. On October 10, 2017, the EPA published a proposed rule to repeal the CPP and, on December 28, 2017, published an advanced notice of proposed rulemaking regarding a CPP replacement rule.
In 2015, parties to the United Nations Framework Convention on Climate Change, including the United States, adopted the Paris Agreement, which established a non-binding universal framework for addressing greenhouse gas (GHG) emissions based on nationally determined contributions. On June 1, 2017, the U.S. President announced that the United States would withdraw from the Paris Agreement and begin renegotiating its terms. The ultimate impact of this agreement or any renegotiated agreement depends on its implementation by participating countries.
The EPA's GHG reporting rule requires annual reporting of GHG emissions expressed in terms of metric tons of CO2 equivalent emissions for a company's operational control of facilities. Based on ownership or financial control of facilities, the Company's 2016 GHG emissions were approximately 13 million metric tons of CO2 equivalent. The preliminary estimate of the Company's 2017 GHG emissions on the same basis is approximately 13 million metric tons of CO2 equivalent.
Income Tax Matters
Consolidated Income Taxes
On behalf of the Company, Southern Company files a consolidated federal income tax return and various state income tax returns, some of which are combined, unitary, or consolidated. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.
The impact of certain tax events at Southern Company and/or its other subsidiaries can, and does, affect the Company's ability to utilize certain tax credits. See "Tax Credits" and ACCOUNTING POLICIES – "Application of Critical Accounting Policies and Estimates" herein and Note 5 to the financial statements for additional information.
The Company currently has unutilized federal ITC and PTC carryforwards totaling approximately $2.0 billion, and thus anticipates utilizing third-party tax equity partnerships as one of the financing sources to fund its renewable growth strategy where the tax partner will take significantly all of the respective federal tax benefits. These tax equity partnerships are expected to be consolidated in the Company's financial statements using a hypothetical liquidation at book value (HLBV) methodology to allocate partnership gains and losses to the Company.
Federal Tax Reform Legislation
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation, among other things, reduces the federal corporate income tax rate to 21%, retains normalization provisions for public utility property and existing renewable energy incentives, and repeals the corporate alternative minimum tax.
contract term. For businesses other than regulated utilities, the Tax Reform Legislation allows 100% bonus depreciation of qualified property acquired and placed in service between September 28, 2017 and January 1, 2023 and phases down 20% each year until it completely phases out for qualified property placed in service after December 31, 2027. Further, the business interest deduction is

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

limited to 30% of taxable income excluding interest, net operating loss (NOL) carryforward, and depreciation and amortization through December 31, 2021 and thereafter to 30% of taxable income excluding interest and NOL carryforwards.
In addition, under the Tax Reform Legislation, NOLs generated after December 31, 2017 can no longer be carried back to previous tax years but can be carried forward indefinitely, with utilization limited to 80% of taxable income of the subsequent tax year. The projected reduction of Southern Company's consolidated income tax liability resulting from the tax rate reduction also delays the expected utilization of existing tax credit carryforwards.
For the year ended December 31, 2017, implementation of the Tax Reform Legislation resulted in an estimated net tax benefit of $743 million, primarily due to the impact of the reduction of the corporate income tax rate on deferred tax assets and liabilities.
The Tax Reform Legislation is subject to further interpretation and guidance from the IRS, as well as each respective state's adoption. In addition, the regulatory treatment of certain impacts of the Tax Reform Legislation is subject to the discretion of the FERC.
See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
The ultimate outcome of these matters cannot be determined at this time.
Tax Credits
The Tax Reform Legislation retained the renewable energy incentives that were included in the Protecting Americans from Tax Hikes (PATH) Act. The PATH Act allows for 30% ITC for solar projects that commence construction by December 31, 2019; 26% ITC for solar projects that commence construction in 2020; 22% ITC for solar projects that commence construction in 2021; and a permanent 10% ITC for solar projects that commence construction on or after January 1, 2022. In addition, the PATH Act allows for 100% PTC for wind projects that commenced construction in 2016; 80% PTC for wind projects that commenced construction in 2017; 60% PTC for wind projects that commence construction in 2018; and 40% PTC for wind projects that commence construction in 2019. Wind projects commencing construction after 2019 will not be entitled to any PTCs. The Company has received ITCs related to its investment in new solar facilities acquired or constructed and receives PTCs related to the first 10 years of energy production from its wind facilities, which have had, and will continue to have, a material impact on the Company's cash flows and net income. At December 31, 2017, the Company had approximately $2.0 billion of unutilized ITCs and PTCs, which are currently expected to be fully utilized by 2027, but could be further delayed as a result of the Company's continued growth strategy, as well as the impacts from the Tax Reform Legislation. See Note 1 to the financial statements under "Income and Other Taxes" and Note 5 to the financial statements under "Current and Deferred Income Taxes – Tax Credit Carryforwards" and "Effective Tax Rate" for additional information regarding utilization and amortization of credits and the tax benefit related to basis differences.
Bonus Depreciation
Under the Tax Reform Legislation, projects with binding contracts prior to September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the PATH Act. The PATH Act allowed for 50% bonus depreciation for 2015 through 2017, 40% bonus depreciation for 2018, and 30% bonus depreciation for 2019 and certain long-lived assets placed in service in 2020. Based on provisional estimates, approximately $130 million of positive cash flows is expected to result from bonus depreciation for the 2017 tax year. Should Southern Company have a NOL in 2018, all of these cash flows may not be fully realized in 2018. In addition, any cash flows resulting from bonus depreciation will also be impacted by the Company's use of third-party tax equity arrangements. See Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information. The ultimate outcome of these matters cannot be determined at this time.
Legal Entity Reorganization
In September 2017, the Company began a legal entity reorganization of various direct and indirect subsidiaries that own and operate substantially all of the solar facilities, including certain subsidiaries owned in partnership with various third parties. The reorganization included the purchase of all of the redeemable noncontrolling interests, representing 10% of the membership interests, in Southern Turner Renewable Energy, LLC. The reorganization is expected to be substantially completed in the first quarter 2018 and is expected to result in estimated tax benefits totaling between $50 million and $55 million related to certain changes in state apportionment rates and net operating loss carryforward utilization that will be recorded in the first quarter 2018. The Company is pursuing the sale of a 33% equity interest in the newly-formed holding company owning these solar assets. The ultimate outcome of this matter cannot be determined at this time.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Acquisitions
During 2017 and subsequent to December 31, 2017, in accordance with its overall growth strategy, the Company acquired the projects discussed below, as well as the Cactus Flats wind facility discussed under "Construction Projects" herein. See Note 11 to the financial statements for additional information.
Project FacilityResourceSeller, Acquisition Date
Approximate Nameplate Capacity (MW)
LocationPercentage OwnershipActual/Expected CODPPA CounterpartiesPPA Contract Period
Business Acquisitions During the Year Ended December 31, 2017
BethelWindInvenergy Wind Global LLC, January 6, 2017276Castro County, TX100% January 2017Google Energy, LLC12 years
Asset Acquisitions Subsequent to December 31, 2017
Gaskell West 1Solar
Recurrent Energy Development Holdings, LLC, 
January 26, 2018
20Kern County, CA100% of Class B(*)March 2018Southern California Edison20 years
(*)The Company owns 100% of the class B membership interest under a tax equity partnership agreement.
Construction Projects
Construction Projects Completed and in Progress
During 2017, in accordance with its overall growth strategy, the Company completed construction of and placed in service, or continued construction of, the projects set forth in the table below.
Project FacilityResource
Approximate Nameplate Capacity (MW)
 LocationOwnership PercentageActual / Expected CODPPA CounterpartiesPPA Contract Period
Construction Projects Completed During the Year Ended December 31, 2017
East PecosSolar120 Pecos County, TX100% March 2017Austin Energy15 years
LamesaSolar102 Dawson County, TX100% April 2017City of Garland, Texas15 years
Projects Under Construction at December 31, 2017
Cactus FlatsWind148 Concho County, TX100%(*)Third quarter 2018General Motors and General Mills12 years and 15 years
Mankato ExpansionNatural Gas345 Mankato, MN100%
 Second quarter 2019Northern States Power Company20 years
(*) On July 31, 2017, the Company purchased 100% of the Cactus Flats facility and commenced construction. Upon placing the facility in service, the Company expects to close on a tax equity partnership agreement that has already been executed, subject to various customary conditions at closing, and will then own 100% of the class B membership interests.
Total aggregate construction costs for projects under construction at December 31, 2017, excluding acquisition costs and including construction costs to complete the subsequently-acquired Gaskell West 1 solar project, are expected to be between $385 million and $430 million. At December 31, 2017, total costs of construction incurred for these projects was $188 million, all of which remained in CWIP.
Development Projects
During 2017, as part of the Company's renewable development strategy, the Company purchased wind turbine equipment from Siemens Wind Power, Inc. and Vestas-American Wind Technology, Inc. to be used for various development and construction projects, up to 900 MWs in total. Once these wind projects reach commercial operations, which is expected in 2021, they are expected to qualify for 80% PTCs.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

During 2016, the Company entered into a joint development agreement with Renewable Energy Systems Americas, Inc. to develop and construct approximately 3,000 MWs of wind projects expected to be placed in service between 2018 and 2020. In addition, in 2016, the Company purchased wind turbine equipment from Siemens Wind Power, Inc. and Vestas-American Wind Technology, Inc. to be used for construction of the facilities. Once these wind projects reach commercial operations, they are expected to qualify for 100% PTCs.
The ultimate outcome of these matters cannot be determined at this time.
FERC Matters
The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies and the Company filedSouthern Power, these contracts primarily relate to PPAs whereby electricity and generation capacity are provided to a triennial market power analysis in 2014, which included continued reliance on the energy auction as tailored mitigation. In 2015, the FERC issued an order finding that the traditional electric operating companies' and the Company's existing tailored mitigation may not effectively mitigate the potential to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas.customer. The FERC directed the traditional electric operating companies and the Company to show why market-based rate authority should not be revoked in these areas or to provide a mitigation plan to further address market power concerns. The traditional electric operating companies and the Company filed a request for rehearing and filed their response with the FERC in 2015.
In December 2016, the traditional electric operating companies and the Company filed an amendment to their market-based rate tariff that proposed certain changes to the energy auction, as well as several non-tariff changes. On February 2, 2017, the FERC issued an order accepting all such changes subject to an additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigationrevenue recognized for the traditional electric operating companies' and the Company's potential to exert market power indelivery of electricity is variable; however, certain areas served by the traditional electric operating companies and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' and the Company's compliance filing accepting the terms of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remainsPPAs include a separate, ongoing matter.
On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' and the Company's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies and the Company to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies and the Company responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.
The ultimate outcome of these matters cannot be determined at this time.
Other Matters
The Company is involved in various other matters being litigated and regulatory matters that could affect future earnings. In addition, the Company is subject to certain claims and legal actions arising in the ordinary course of business. The Company's business activities are subject to extensive governmental regulation related to public health and the environment, such as regulation of air emissions and water discharges. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements, such as standardsfixed payment for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters.
The ultimate outcome of such pending or potential litigation or regulatory matters cannot be predicted at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements.
During 2015, the Company indirectly acquired a 51% membership interest in RE Roserock LLC (Roserock), the owner of the Roserock facility in Pecos County, Texas, which was under construction by Recurrent Energy, LLC and was subsequently placed in service in November 2016. Prior to placing the facility in service, certain solar panels were damaged during installation. While the facility currently is generating energy consistent with operational expectations and PPA obligations, the Company is pursuing remedies under its insurance policies and other contracts to repair or replace these solar panels. In connection therewith, the Company is withholding payments of approximately $26 million from the construction contractor, who has placed a lien on the

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Roserock facility for the same amount. The amounts withheld are included in other accounts payable and other current liabilities on the Company's consolidated balance sheets. On May 18, 2017, Roserock filed a lawsuit in the state district court in Pecos County, Texas, against XL Insurance America, Inc. (XL) and North American Elite Insurance Company (North American Elite) seeking recovery from an insurance policy for damages resulting from a hail storm and certain installation practices by the construction contractor, McCarthy Building Companies, Inc. (McCarthy). On May 19, 2017, Roserock filed a separate lawsuit against McCarthy in the state district court in Travis County, Texas alleging breach of contract and breach of warranty for the damages sustained at the Roserock facility, which has since been moved to the U.S. District Court for the Western District of Texas. On May 22, 2017, McCarthy filed a counter lawsuit against Roserock, Array Technologies, Inc., Canadian Solar (USA), Inc., XL, and North American Elite in the U.S. District Court for the Western District of Texas alleging, among other things, breach of contract, and requesting foreclosure of mechanic's liens against Roserock. On July 18, 2017, the U.S. District Court for the Western District of Texas consolidated the two pending lawsuits. On December 11, 2017, the U.S. District Court for the Western District of Texas dismissed McCarthy's claims against Canadian Solar (USA), Inc. and dismissed cross-claims that XL and North American Elite had sought to bring against Roserock. The Company intends to vigorously pursue and defend these matters, the ultimate outcome of which cannot be determined at this time.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Company prepares its consolidated financial statements in accordance with GAAP. Significant accounting policies are described in Note 1 to the financial statements. In the application of these policies, certain estimates are made that may have a material impact on the Company's results of operations and related disclosures. Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed the following critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Revenue Recognition
The Company's revenue recognition depends on appropriate classification and documentation of transactions in accordance with GAAP. In general, the Company's power sale transactions, which include PPAs, can be classified in one of four categories: leases, non-derivatives or normal sale derivatives, derivatives designated as cash flow hedges, and derivatives not designated as hedges. For more information on derivative transactions, see FINANCIAL CONDITION AND LIQUIDITY – "Market Price Risk" herein and Notes 1 and 9 to the financial statements. The Company's revenues are dependent upon significant judgments used to determine the appropriate transaction classification, which must be documented upon the inception of each contract.
Lease Transactions
The Company considers the following factors to determine whether the sales contract is a lease:
Assessing whether specific property is explicitly or implicitly identified in the agreement;
Determining whether the fulfillment of the arrangement is dependent on the use of the identified property; and
Assessing whether the arrangement conveys to the purchaser the right to use the identified property.
If the contract meets the above criteria for a lease, the Company performs further analysis as to whether the lease is classified as operating, financing, or sales-type. All of the Company's power sales contracts that are determined to be leases are accounted for as operating leases and thefixed generation capacity revenue is recognized on a straight-line basis over the term of the contract. For Southern Company Gas, these contracts primarily relate to the U.S. General Services Administration contract and is included in thedescribed above. Southern Company's operating revenues. Energy revenues and other contingent revenuesunregulated distributed generation business also has partially satisfied performance obligations related to certain fixed price contracts. Revenues from contracts with customers related to these performance obligations remaining at December 31, 2023 are expected to be recognized in the period the energy is delivered or the service is rendered.as follows:
Non-Derivative and Normal Sale Derivative Transactions
If the power sales contract is not classified as a lease, the Company further considers the following factors to determine proper classification:
Assessing whether the contract meets the definition of a derivative;
Assessing whether the contract meets the definition of a capacity contract;
Assessing the probability at inception and throughout the term of the individual contract that the contract will result in physical delivery; and
Ensuring that the contract quantities do not exceed available generating capacity (including purchased capacity).
20242025202620272028Thereafter
(in millions)
Southern Company$940 $552 $338 $332 $323 $2,045 
Alabama Power23 — — — — 
Georgia Power73 41 14 15 15 
Mississippi Power60 63 66 69 73 — 
Southern Power379 301 299 306 297 2,041 
Southern Company Gas26 — — — — — 
II-166



MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Contracts that do not meet the definition of a derivative or are designated as normal sales (i.e. capacity contracts which provide for the sale of electricity that involve physical delivery in quantities within the Company's available generating capacity) are accounted for as executory contracts. The related capacity revenue, if any, is recognized on an accrual basis in amounts equal to the lesser of the cumulative levelized amount or the cumulative amount billable under the contract over the respective contract periods. Revenues related to energy and ancillary services are recognized in the period the energy is delivered or the service is rendered.
Cash Flow Hedge Transactions
The Company further considers the following in designating other derivative contracts for the sale of electricity as cash flow hedges of anticipated sale transactions:
Identifying the hedging instrument, the forecasted hedged transaction, and the nature of the risk being hedged; and
Assessing hedge effectiveness at inception and throughout the contract term.
These contracts are accounted for on a fair value basis and are recorded in AOCI over the life of the contract. Realized gains and losses are then recognized in operating revenues as incurred.
Mark-to-Market Transactions
Contracts for sales of electricity, which meet the definition of a derivative and that either do not qualify or are not designated as normal sales or as cash flow hedges, are accounted for on a fair value basis and are recorded in operating revenues.
Impairment of Long-Lived Assets and Intangibles
The Company's investments in long-lived assets are primarily generation assets, whether in service or under construction. The Company's intangible assets arise from certain acquisitions and consist of acquired PPAs, which are amortized to revenue over the term of the respective PPAs. The Company evaluates the carrying value of these assets whenever indicators of potential impairment exist. Examples of impairment indicators could include significant changes in construction schedules, current period losses combined with a history of losses or a projection of continuing losses, a significant decrease in market prices, and the inability to remarket generating capacity for an extended period. If an indicator exists, the asset is tested for recoverability by comparing the asset carrying value to the sum of the undiscounted expected future cash flows directly attributable to the asset. If the estimate of undiscounted future cash flows is less than the carrying value of the asset, the fair value of the asset is determined and a loss is recorded. A high degree of judgment is required in developing estimates related to these evaluations, which are based on projections of various factors, including the following:
Future demand for electricity based on projections of economic growth and estimates of available generating capacity;
Future power and natural gas prices, which have been quite volatile in recent years; and
Future operating costs.
Acquisition Accounting
The Company may acquire generation assets as part of its overall growth strategy. At the time of an acquisition, the Company will assess if these assets and activities meet the definition of a business. For acquisitions that meet the definition of a business, the Company includes operating results from the date of acquisition in its consolidated financial statements. The purchase price, including any contingent consideration, is allocated based on the fair value of the identifiable assets acquired and liabilities assumed (including any intangible assets). Assets acquired that do not meet the definition of a business are accounted for as an asset acquisition.
The purchase price of each asset acquisition is allocated based on the relative fair value of assets acquired. Determining the fair value of assets acquired and liabilities assumed requires management judgment and the Company may engage independent valuation experts to assist in this process. Fair values are determined by using market participant assumptions, and typically include the timing and amounts of future cash flows, incurred construction costs, the nature of acquired contracts, discount rates, power market prices, and expected asset lives. Any due diligence or transition costs incurred by the Company for potential or successful acquisitions are expensed as incurred.
Contingent consideration primarily relates to fixed amounts due to the seller once the facility is placed in service. For contingent consideration with variable payments, the Company fair values the arrangement with any changes recorded in the consolidated statements of income. See Note 8 to the financial statements for additional fair value information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Accounting for Income Taxes
The consolidated income tax provision and deferred income tax assets and liabilities, as well as any unrecognized tax benefits and valuation allowances, require significant judgment and estimates. These estimates are supported by historical tax return data, reasonable projections of taxable income, and interpretations of applicable tax laws and regulations across multiple taxing jurisdictions. The effective tax rate reflects the statutory tax rates and calculated apportionments for the various states in which the Company operates.
On behalf of the Company, Southern Company files a consolidated federal income tax return and various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. Certain deductions and credits can be limited at the consolidated or combined level resulting in NOL and tax credit carryforwards that would not otherwise result on a stand-alone basis. Utilization of NOL and tax credit carryforwards and the assessment of valuation allowances are based on significant judgment and extensive analysis of the Company's, as well as Southern Company's, current financial position and result of operations, including currently available information about future years, to estimate when future taxable income will be realized.
Current and deferred state income tax liabilities and assets are estimated based on laws of multiple states that determine the income to be apportioned to their jurisdictions. States utilize various formulas to calculate the apportionment of taxable income, primarily using sales, assets, or payroll within the jurisdiction compared to the consolidated totals. In addition, each state varies as to whether a stand-alone, combined, or unitary filing methodology is required. The calculation of deferred state taxes considers apportionment factors and filing methodologies that are expected to apply in future years. The apportionments and methodologies which are ultimately finalized in a manner inconsistent with expectations could have a material effect on the Company's financial statements.
Given the significant judgment involved in estimating NOL and tax credit carryforwards and multi-state apportionments for all subsidiaries, the Company considers state deferred income tax liabilities and assets to be critical accounting estimates.
Federal Tax Reform Legislation
Following the enactment of the Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impact of the Tax Reform Legislation on deferred income tax assets and liabilities cannot be determined at this time. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Federal Tax Reform Legislation" herein and Note and 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing or amounts of revenue recognized in the Company's financial statements. Some contractual arrangements, such as certain capacity and energy payments, are excluded from the scope of ASC 606 and included in the scope of the current leasing guidance or the current derivative guidance.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. The adoption of ASC 606 did not result in a cumulative adjustment.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases where the majority relate to land leases for its renewable generation facilities. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet for lessee arrangements.
Other
In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18). ASU 2016-18 eliminates the need to reflect transfers between cash and restricted cash in operating, investing, and financing activities in the statement of cash flows. Upon adoption, the net change in cash and cash equivalents during the period will include amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, and will be applied retrospectively to each period presented. The Company adopted ASU 2016-18 effective January 1, 2018 with no material impact on its financial statements.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in other income (expense) in the income statement. Additionally, only the service cost component related to construction labor is eligible for capitalization, when applicable. The Company adopted ASU 2017-07 which is effective for periods beginning after December 15, 2017; however, since the Company only became a sponsor of a qualified pension plan and postretirement benefit plan in December 2017, no retrospective presentation of net periodic benefits costs for 2016 or 2017 is required. See Note 2 to the financial statements for additional information.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
FINANCIAL CONDITION AND LIQUIDITY
Overview
The Company's financial condition remained stable at December 31, 2017. The Company's cash requirements primarily consist of funding ongoing business operations, common stock dividends, distributions to noncontrolling interests, capital expenditures, and debt maturities. Capital expenditures and other investing activities may include investments in acquisitions or new construction associated with the Company's overall growth strategy and to maintain the existing generation fleet's performance. Operating cash flows, which may include the utilization of tax credits, will only provide a portion of the Company's cash needs. For the three-year period from 2018 through 2020, the Company's projected dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows. The Company plans to finance future cash needs in excess of its operating cash flows primarily through debt issuances, borrowings from financial institutions, and equity contributions from Southern Company. The Company intends to continue to monitor its access to short-term and long-term capital markets as well as bank credit agreements as needed to meet its future capital and liquidity needs. See "Sources of Capital" herein for additional information on lines of credit.
The Company also anticipates utilizing third-party tax equity partnerships as one of the financing sources to fund its renewable growth strategy where the tax partner will take significantly all of the federal tax benefits. These tax equity partnerships are expected to be consolidated in the Company's financial statements using a HLBV methodology to allocate partnership gains and losses to the Company. The Company recently secured third-party tax equity funding for the Cactus Flats project subject to

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

achieving commercial operation and various other customary conditions to closing as well as for the Gaskell West 1 project. The ultimate outcome of these matters cannot be determined at this time.
In addition, the Company is pursuing the sale of a 33% equity interest in a newly-formed holding company that owns substantially all of the Company's solar assets, which, if successful, is expected to close in the middle of 2018. Proceeds from the sale may be used for debt redemptions, common stock dividends, working capital, and general corporate purposes as well to support the Company's continuing growth strategy.
Net cash provided from operating activities totaled $1.2 billion in 2017, an increase of $816 million compared to 2016. The increase in net cash provided from operating activities was primarily due to income tax refunds received and an increase in energy sales from new solar and wind facilities, partially offset by an increase in interest paid.As of December 31, 2017, the Company had $2.0 billion of unutilized ITCs and PTCs which are not expected to be fully utilized until 2027. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters – Tax Credits" herein for additional information. Net cash provided from operating activities totaled $339 million in 2016, a decrease of $664 million compared to 2015 primarily due to an increase in unutilized ITCs and PTCs.
Net cash used for investing activities totaled $1.6 billion, $4.8 billion, and $2.5 billion in 2017, 2016, and 2015, respectively, and was primarily due to acquisitions and the construction of renewable and natural gas facilities. See FUTURE EARNINGS POTENTIAL – "Acquisitions" and "Construction Projects" herein for additional information.
Net cash used for financing activities totaled $502 million in 2017 primarily due to payments of common stock dividends and distributions to noncontrolling interests. Net cash provided from financing activities totaled $4.7 billion in 2016 primarily due to the issuance of additional senior notes and capital contributions from Southern Company and noncontrolling interests. Net cash provided from financing activities totaled $2.3 billion in 2015 primarily due to the issuance of additional senior notes and a 13-month term loan.
Significant balance sheet changes include a $1.0 billion increase in plant in service primarily due to new solar and wind facilities being acquired or placed in service, a $284 million increase in deferred income taxes primarily due to additional unutilized PTCs, and a $113 million increase in CWIP primarily due to the construction of a new wind facility and the Mankato natural gas expansion project. In addition, ITC benefits that are deferred and amortized over the asset lives increased $45 million as a result of additional ITCs from new solar facilities being placed in service, offset by ongoing ITC amortization. Other significant changes include a $970 million decrease in cash and cash equivalents and a $456 million decrease in acquisitions payable.
Sources of Capital
The Company plans to obtain the funds required for acquisitions, construction, development, debt maturities, and other purposes from operating cash flows, external securities issuances, borrowings from financial institutions, tax equity partnership contributions, and equity contributions from Southern Company. The Company also plans to utilize funds resulting from any potential sale of a 33% equity interest in substantially all of its solar asset portfolio, if completed. However, the amount, type, and timing of any future financings, if needed, will depend upon prevailing market conditions, regulatory approval, and other factors. With respect to the public offering of securities, the Company (excluding its subsidiaries) issues and offers debt registered on registration statements filed with the SEC under the Securities Act of 1933, as amended.
At December 31, 2017, the Company's current liabilities exceeded current assets by $474 million due to long-term debt maturing in the next 12 months, the use of short-term debt as a funding source, and fluctuations in cash needs, due to both seasonality and the stage of acquisitions and construction projects. The Company believes the need for working capital can be adequately met by utilizing the commercial paper program, the Facility (as defined below), borrowings from financial institutions, the debt capital markets, the commercial paper program, and operating cash flows.
The Company obtains financing separately without credit support from any affiliate. To meet liquidity and capital resource requirements, the Company had cash and cash equivalents of approximately $129 million at December 31, 2017.
The Company's commercial paper program is used to finance acquisition and construction costs related to electric generating facilities and for general corporate purposes, including maturing debt. The Company's subsidiaries are not issuers under the commercial paper program.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Details of commercial paper were as follows:
 
Commercial Paper at the
End of the Period
 
Commercial Paper During the Period (*)
 Amount Outstanding Weighted Average Interest Rate Average Amount Outstanding Weighted Average Interest Rate Maximum Amount Outstanding
 (in millions)   (in millions)   (in millions)
December 31, 2017$105
 2.0% $232
 1.4% $628
December 31, 2016$
 N/A $56
 0.8% $310
December 31, 2015$
 N/A $166
 0.5% $385
(*)Average and maximum amounts are based upon daily balances during the twelve-month periods ended December 31, 2017, 2016, and 2015.
Company Credit Facilities
At December 31, 2017, the Company had a committed credit facility (Facility) of $750 million expiring in 2022, of which $22 million has been used for letters of credit and $728 million remains unused. In May 2017, the Company amended the Facility, which, among other things, extended the maturity date from 2020 to 2022 and increased the Company's borrowing ability under this Facility to $750 million from $600 million. The Company's subsidiaries are not borrowers under the Facility. Proceeds from the Facility may be used for working capital and general corporate purposes as well as liquidity support for the Company's commercial paper program. Subject to applicable market conditions, the Company expects to renew or replace the Facility, as needed, prior to expiration. In connection therewith, the Company may extend the maturity date and/or increase or decrease the lending commitment thereunder. See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
The Facility, as well as the Company's term loan agreements, contains a covenant that limits the ratio of debt to capitalization (as defined in the Facility) to a maximum of 65% and contains a cross-default provision that is restricted only to indebtedness of the Company. For purposes of this definition, debt excludes any project debt incurred by certain subsidiaries of the Company to the extent such debt is non-recourse to the Company, and capitalization excludes the capital stock or other equity attributable to such subsidiary. The Company is currently in compliance with all covenants in the Facility.
The Company also has a $120 million continuing letter of credit facility expiring in 2019 for standby letters of credit. At December 31, 2017, $101 million has been used for letters of credit, primarily as credit support for PPA requirements, and $19 million remains unused. The Company's subsidiaries are not parties to this letter of credit facility.
In addition, at both December 31, 2017 and 2016, the Company had $113 million of cash collateral posted related to PPA requirements.
Subsidiary Project Credit Facilities
In connection with the construction of solar facilities by RE Tranquillity LLC, RE Garland Holdings LLC, and RE Roserock LLC, indirect subsidiaries of the Company, each subsidiary had entered into separate credit agreements (Project Credit Facilities), which were non-recourse to the Company (other than the subsidiary party to the agreement). Each Project Credit Facility provided (a) a senior secured construction loan credit facility, (b) a senior secured bridge loan facility, and (c) a senior secured letter of credit facility that was secured by the membership interests of the respective project company, with proceeds directed to finance project costs related to the respective solar facilities. Each Project Credit Facility was secured by the assets of the applicable project subsidiary and membership interests of the applicable project subsidiary. The Tranquillity, Garland, and Roserock Project Credit Facilities were fully repaid on October 14, 2016, December 29, 2016, and January 31, 2017, respectively.
Furthermore, in connection with the acquisition of the Henrietta solar facility on July 1, 2016, a subsidiary of the Company assumed a $217 million construction loan, which was fully repaid in September 2016.
Financing Activities
Senior Notes
In November 2017, the Company issued $525 million aggregate principal amount of Series 2017A Floating Rate Senior Notes due December 20, 2020, which bear interest based on three-month LIBOR. The net proceeds were used to redeem all of the $500

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

million aggregate principal amount of Series 2015D 1.85% Senior Notes due December 1, 2017 and to repay a portion of the Company's outstanding short-term debt.
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Company plans to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Other Debt
In September 2017, the Company amended its $60 million aggregate principal amount floating rate term loan to, among other things, increase the aggregate principal amount to $100 million and extend the maturity date from September 2017 to October 2018. The additional $40 million of proceeds were used to repay existing indebtedness and for other general corporate purposes. At December 31, 2017, this outstanding term loan was included in securities due within one year.
In addition, during 2017, the Company issued a total of $21 million in letters of credit under the Company's credit facilities.
Credit Rating Risk
The Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
There are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change to BBB and/or Baa2 or below. These contracts are for physical electricity purchases and sales, fuel transportation and storage, energy price risk management, and transmission.
The maximum potential collateral requirements under these contracts at December 31, 2017 were as follows:
Credit RatingsMaximum Potential Collateral Requirements
 (in millions)
At BBB and/or Baa2$39
At BBB- and/or Baa3$415
At BB+ and/or Ba1 (*)
$1,118
(*)
Any additional credit rating downgrades at or below BB- and/or Ba3 could increase collateral requirements up to an additional $38 million.
Included in these amounts are certain agreements that could require collateral in the event that Alabama Power or Georgia Power has a credit rating change to below investment grade. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Company to access capital markets and would be likely to impact the cost at which it does so.
In addition, the Company has a PPA that could require collateral, but not accelerated payment, in the event of a downgrade of the Company's credit. The PPA requires credit assurances without stating a specific credit rating. The amount of collateral required would depend upon actual losses resulting from a credit downgrade.
On March 24, 2017, S&P revised its consolidated credit rating outlook for Southern Company and its subsidiaries (including the Company) from stable to negative.
While it is unclear how the credit rating agencies may respond to the Tax Reform Legislation, certain financial metrics, such as the funds from operations to debt percentage, used by the credit rating agencies to assess Southern Company and its subsidiaries, including the Company, may be negatively impacted. Absent actions by the Company to mitigate the resulting impacts, which, among other alternatives, could include adjusting the Company's capital structure, the Company's credit ratings could be negatively affected.
Market Price Risk
The Company is exposed to market risks, primarily commodity price risk, interest rate risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, the Company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company's policies in areas such as counterparty exposure and risk management practices. The Company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the consolidated balance sheets as either assets or liabilities and are presented on a gross basis. In the statements of cash flows, the cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities.
At December 31, 2017, the Company had $945 million of long-term variable rate notes outstanding. If the Company sustained a 100 basis point change in interest rates for its variable interest rate exposure, the change would effect annualized interest expense by approximately $9 million at December 31, 2017. Since a significant portion of outstanding indebtedness bears interest at fixed rates, the Company is not aware of any facts or circumstances that would significantly affect exposure on existing indebtedness in the near term. However, the impact on future financing costs cannot be determined at this time.
The Company had foreign currency denominated debt of €1.1 billion at December 31, 2017. The Company has mitigated its exposure to foreign currency exchange rate risk through the use of foreign currency swaps converting all interest and principal payments to fixed-rate U.S. dollars.
Because energy from the Company's facilities is primarily sold under long-term PPAs with tolling agreements and provisions shifting substantially all of the responsibility for fuel cost to the counterparties, the Company's exposure to market volatility in commodity fuel prices and prices of electricity is generally limited. However, the Company has been and may continue to be exposed to market volatility in energy-related commodity prices as a result of uncontracted generating capacity.
For the years ended December 31, 2017 and 2016, the changes in fair value of energy-related derivative contracts associated with both power and natural gas positions were as follows:
 20172016
 (in millions)
Contracts outstanding at the beginning of period, assets (liabilities), net$16
$1
Contracts realized or settled(17)(3)
Current period changes (*)
(9)18
Contracts outstanding at the end of period, assets (liabilities), net$(10)$16
(*)Current period changes also include changes in the fair value of new contracts entered into during the period, if any.
For the years ending December 31, 2017 and 2016, the changes in contracts outstanding were attributable to both the volume and the prices of power and natural gas as follows:
 20172016
Power – net sold  
MWH (in millions)3.0
6.1
Weighted average contract cost per MWH above (below) market prices (in dollars)$(2.67)$1.45
Natural Gas – net purchased  
Commodity - mmBtu (in millions)14.4
27.1
Commodity - weighted average contract cost per mmBtu above (below) market prices (in dollars)$0.12
$(0.27)
Gains and losses on energy-related derivatives designated as cash flow hedges which are used by the Company to hedge anticipated purchases and sales are initially deferred in OCI before being recognized in income in the same period as the hedged transactions are reflected in earnings. Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the consolidated statements of income as incurred.
The Company uses over-the-counter contracts that are not exchange traded but are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. See Note 8 to the financial statements for further discussion of fair value measurements. The energy-related derivative contracts outstanding at December 31, 2017 all mature in 2018.
The Company is exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Company only enters into agreements and material transactions with counterparties that have investment grade credit ratings by S&P and Moody's or with counterparties who have posted collateral to cover potential credit exposure. The Company has also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk. Therefore, the Company does not anticipate a material adverse effect on the financial statements as a result of counterparty nonperformance. See Note 1 to the financial statements under "Financial Instruments" and Note 9 to the financial statements for additional information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Capital Requirements and Contractual Obligations
The capital program of the Company is subject to periodic review and revision and is currently estimated to total $7.2 billion over the next five years through 2022. This includes approximately $0.9 billion in committed construction, capital improvements, and work to be performed under LTSAs, totaling approximately $400 million for 2018 and an average of approximately $137 million each year from 2019 through 2022. In addition, the capital program includes a further $6.3 billion in planned expenditures for plant acquisitions and placeholder growth, which averages approximately $1.3 billion per year. Planned expenditures for plant acquisitions and placeholder growth may vary materially due to market opportunities and the Company's ability to execute its growth strategy. Actual construction costs may vary from these estimates because of numerous factors such as: changes in business conditions; changes in the expected environmental compliance program; changes in environmental laws and regulations; the outcome of any legal challenges to the environmental rules; changes in FERC rules and regulations; changes in load projections; changes in legislation; the cost and efficiency of construction labor, equipment, and materials; project scope and design changes; and the cost of capital. See Note 11 to the financial statements for additional information.
Other funding requirements related to obligations associated with scheduled maturities of long-term debt, as well as the related interest, leases, derivative obligations, other purchase commitments, and pension and other postretirement benefit plans are detailed in the contractual obligations table that follows. See Notes 1, 2, 5, 6, 7, and 9 to the financial statements for additional information.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Contractual Obligations
Contractual obligations at December 31, 2017 were as follows:
 2018 
2019-
2020
 
2021-
2022
 
After
2022
 Total
 (in millions)
Long-term debt(a) —
         
Principal$770
 $1,425
 $977
 $2,630
 $5,802
Interest189
 334
 278
 1,524
 2,325
Financial derivative obligations(b)
13
 
 
 
 13
Operating leases(c)
22
 45
 45
 815
 927
Purchase commitments —         
Capital(d)
1,099
 3,661
 1,750
 
 6,510
Fuel(e)
453
 555
 327
 56
 1,391
Purchased power(f)
40
 82
 42
 
 164
Other(g)
149
 315
 216
 1,770
 2,450
Pension and other postretirement benefit plans(h)

 1
 
 
 1
Total$2,735
 $6,418
 $3,635
 $6,795
 $19,583
(a)All amounts are reflected based on final maturity dates and include the effects of interest rate derivatives employed to manage interest rate risk and effects of foreign currency swaps employed to manage foreign currency exchange rate risk. Included in debt principal is a $77 million gain related to the foreign currency hedge of €1.1 billion. The Company plans to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
(b)For additional information, see Notes 1 and 9 to the financial statements.
(c)Operating lease commitments include certain land leases for solar and wind facilities that are subject to annual price escalation based on indices. See Note 7 to the financial statements under "Commitments" for additional information.
(d)The Company provides estimated capital expenditures for a five-year period, including capital expenditures associated with environmental regulations. Included in these amounts are planned expenditures for plant acquisitions and placeholder growth, which averages approximately $1.3 billion per year, and may vary materially each year due to market opportunities and the Company's ability to execute its growth strategy. Amounts represent current estimates of total expenditures, excluding capital expenditures covered under LTSAs which are reflected in "Other." See Note (g) below. At December 31, 2017, significant purchase commitments were outstanding in connection with the construction program.
(e)Primarily includes commitments to purchase, transport, and store natural gas. Amounts reflected are based on contracted cost and may contain provisions for price escalation. Amounts reflected for natural gas purchase commitments are based on various indices at the time of delivery and have been estimated based on the New York Mercantile Exchange future prices at December 31, 2017.
(f)Purchased power commitments will be resold under a third party agreement at cost.
(g)Includes commitments related to LTSAs, operation and maintenance agreements, and transmission. LTSAs include price escalation based on inflation indices. Transmission commitments are based on the Southern Company system's current tariff rate for point-to-point transmission.
(h)The Company forecasts contributions to the pension and other postretirement benefit plans over a three-year period. The Company anticipates no mandatory contributions to the qualified pension plan during the next three years. Amounts presented represent estimated benefit payments for the nonqualified pension plans, estimated non-trust benefit payments for the other postretirement benefit plans, and estimated contributions to the other postretirement benefit plan trusts, all of which will be made from the Company's corporate assets. See Note 2 to the financial statements for additional information related to the pension and other postretirement benefit plans, including estimated benefit payments. Certain benefit payments will be made through the related benefit plans. Other benefit payments will be made from the Company's corporate assets.

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Cautionary Statement Regarding Forward-Looking Statements
The Company's 2017 Annual Report contains forward-looking statements. Forward-looking statements include, among other things, statements concerning the strategic goals for the Company's business, economic conditions, fuel and environmental cost recovery, current and proposed environmental regulations and related compliance plans and estimated expenditures, pending or potential litigation matters, access to sources of capital, financing activities, estimated sales and purchases under power sale and purchase agreements, timing of expected future capacity need in existing markets, completion dates of construction projects, projections for the qualified pension plan and postretirement benefit plans contributions, filings with federal regulatory authorities, impacts of the Tax Reform Legislation, federal and state income tax benefits, and estimated construction and other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:
the impact of recent and future federal and state regulatory changes, including environmental laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which the Company is subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulations and IRS interpretations, actions that may be taken in response by regulatory authorities, and its impact, if any, on the credit ratings of the Company;
current and future litigation or regulatory investigations, proceedings, or inquiries;
the effects, extent, and timing of the entry of additional competition in the markets in which the Company operates;
variations in demand for electricity, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures, including from the development and deployment of alternative energy sources such as self-generation and distributed generation technologies, and any potential economic impacts resulting from federal fiscal decisions;
available sources and costs of fuels;
transmission constraints;
effects of inflation;
the ability to control costs and avoid cost overruns during the development and construction of generating facilities, to construct facilities in accordance with the requirements of permits and licenses, and to satisfy any environmental performance standards, including the requirements of tax credits and other incentives;
investment performance of the Company's employee and retiree benefit plans;
advances in technology;
ongoing renewable energy partnerships and development agreements;
state and federal rate regulations;
the ability to successfully operate generating facilities and the successful performance of necessary corporate functions;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, including the potential sale of a 33% equity interest in substantially all of the Company's solar assets, which cannot be assured to be completed or beneficial to the Company;
the ability of counterparties of the Company to make payments as and when due and to perform as required;
the ability to obtain new short- and long-term contracts with wholesale customers;
the direct or indirect effect on the Company's business resulting from cyber intrusion or physical attack and the threat of physical attacks;
interest rate fluctuations and financial market conditions and the results of financing efforts;
changes in the Company's credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general;

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

the ability of the Company to obtain additional generating capacity (or sell excess generating capacity) at competitive prices;
catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events such as influenzas, or other similar occurrences;
the direct or indirect effects on the Company's business resulting from incidents affecting the U.S. electric grid or operation of generating resources;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by the Company from time to time with the SEC.
The Company expressly disclaims any obligation to update any forward-looking statements.

CONSOLIDATED STATEMENTS OF INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Southern Power Company and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Revenues:     
Wholesale revenues, non-affiliates$1,671
 $1,146
 $964
Wholesale revenues, affiliates392
 419
 417
Other revenues12
 12
 9
Total operating revenues2,075
 1,577
 1,390
Operating Expenses:     
Fuel621
 456
 441
Purchased power149
 102
 93
Other operations and maintenance386
 354
 260
Depreciation and amortization503
 352
 248
Taxes other than income taxes48
 23
 22
Total operating expenses1,707
 1,287
 1,064
Operating Income368
 290
 326
Other Income and (Expense):     
Interest expense, net of amounts capitalized(191) (117) (77)
Other income (expense), net1
 6
 1
Total other income and (expense)(190) (111) (76)
Earnings Before Income Taxes178
 179
 250
Income taxes (benefit)(939) (195) 21
Net Income1,117
 374
 229
Less: Net income attributable to noncontrolling interests46
 36
 14
Net Income Attributable to the Company$1,071
 $338
 $215
The accompanying notes are an integral part of these consolidated financial statements.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2017, 2016, and 2015
Southern Power Company and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Net Income$1,117
 $374
 $229
Other comprehensive income (loss):     
Qualifying hedges:     
Changes in fair value, net of tax of $39, $(17), and $-, respectively63
 (27) 
Reclassification adjustment for amounts included in net income,
net of tax of $(46), $36, and $-, respectively
(73) 58
 1
Total other comprehensive income (loss)(10) 31
 1
Less: Comprehensive income attributable to noncontrolling interests46
 36
 14
Comprehensive Income Attributable to the Company$1,061
 $369
 $216
The accompanying notes are an integral part of these consolidated financial statements.


CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2017, 2016, and 2015
Southern Power Company and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2015
 (in millions)
Operating Activities:     
Net income$1,117
 $374
 $229
Adjustments to reconcile net income
to net cash provided from operating activities —
     
Depreciation and amortization, total536
 370
 254
Deferred income taxes(263) (1,063) 42
Investment tax credits
 
 162
Amortization of investment tax credits(57) (37) (19)
Collateral deposits(4) (102) 
Accrued income taxes, non-current14
 (109) 109
Income taxes receivable, non-current(61) (13) 
Other, net(9) 12
 (2)
Changes in certain current assets and liabilities —     
-Receivables(60) (54) 18
-Other current assets(4) (25) (30)
-Accrued taxes(55) 940
 269
-Other current liabilities1
 46
 (29)
Net cash provided from operating activities1,155
 339
 1,003
Investing Activities:     
Business acquisitions(1,032) (2,294) (1,719)
Property additions(268) (2,114) (1,005)
Change in construction payables(153) (57) 251
Investment in restricted cash(16) (733) (159)
Distribution of restricted cash34
 736
 154
Payments pursuant to LTSAs and for equipment not yet received(203) (350) (82)
Other investing activities15
 15
 22
Net cash used for investing activities(1,623) (4,797) (2,538)
Financing Activities:     
Increase (decrease) in notes payable, net(104) 73
 (58)
Proceeds —     
Capital contributions
 1,850
 646
Senior notes525
 2,831
 1,650
Other long-term debt43
 65
 402
Redemptions —     
Senior notes(500) (200) (525)
Other long-term debt(18) (86) (4)
Distributions to noncontrolling interests(119) (57) (18)
Capital contributions from noncontrolling interests80
 682
 341
Purchase of membership interests from noncontrolling interests(59) (129) 
Payment of common stock dividends(317) (272) (131)
Other financing activities(33) (30) (13)
Net cash provided from (used for) financing activities
(502) 4,727
 2,290
Net Change in Cash and Cash Equivalents(970) 269
 755
Cash and Cash Equivalents at Beginning of Year1,099
 830
 75
Cash and Cash Equivalents at End of Year$129
 $1,099
 $830
Supplemental Cash Flow Information:     
Cash paid (received) during the period for —     
Interest (net of $11, $44, and $14 capitalized, respectively)$189
 $89
 $74
Income taxes (net of refunds and investment tax credits)(487) 116
 (518)
Noncash transactions —     
Accrued property additions at year-end32
 251
 257
Accrued acquisitions at year-end
 461
 

The accompanying notes are an integral part of these consolidated financial statements.

CONSOLIDATED BALANCE SHEETS
At December 31, 2017 and 2016
Southern Power Company and Subsidiary Companies 2017 Annual Report
Assets2017
 2016
 (in millions)
Current Assets:   
Cash and cash equivalents$129
 $1,099
Receivables —   
Customer accounts receivable117
 102
Affiliated50
 57
Other98
 34
Materials and supplies278
 337
Prepaid income taxes50
 74
Other current assets36
 54
Total current assets758
 1,757
Property, Plant, and Equipment:   
In service13,755
 12,728
Less: Accumulated provision for depreciation1,910
 1,484
Plant in service, net of depreciation11,845
 11,244
Construction work in progress511
 398
Total property, plant, and equipment12,356
 11,642
Other Property and Investments:   
Intangible assets, net of amortization of $47 and $22
at December 31, 2017 and December 31, 2016, respectively
411
 436
Total other property and investments411
 436
Deferred Charges and Other Assets:   
Prepaid LTSAs118
 101
Accumulated deferred income taxes925
 594
Income taxes receivable, non-current72
 11
Other deferred charges and assets566
 628
Total deferred charges and other assets1,681
 1,334
Total Assets$15,206
 $15,169
The accompanying notes are an integral part of these consolidated financial statements.

CONSOLIDATED BALANCE SHEETS
At December 31, 2017 and 2016
Southern Power Company and Subsidiary Companies 2017 Annual Report
Liabilities and Stockholders' Equity2017
 2016
 (in millions)
Current Liabilities:   
Securities due within one year$770
 $560
Notes payable105
 209
Accounts payable —   
Affiliated102
 88
Other103
 278
Accrued taxes —   
Accrued income taxes
 148
Other accrued taxes4
 7
Acquisitions payable5
 461
Other current liabilities143
 152
Total current liabilities1,232
 1,903
Long-Term Debt:   
Senior notes —   
1.50% due 2018
 350
1.95% due 2019600
 600
2.375% due 2020300
 300
2.50% due 2021300
 300
1.00% due 2022720
 632
1.85% to 5.25% due 2023-20462,664
 2,592
Other long-term debt —   
Variable rate (1.88% at 12/31/17) due 2018
 320
Variable rate (2.18% at 12/31/17) due 2020525
 
Variable rate (3.75% at 1/1/17) due 2032-2036
 15
Unamortized debt premium (discount), net(10) (12)
Unamortized debt issuance expense(28) (29)
Long-term debt5,071
 5,068
Deferred Credits and Other Liabilities:   
Accumulated deferred income taxes199
 152
Accumulated deferred ITCs1,884
 1,839
Other deferred credits and liabilities322
 368
Total deferred credits and other liabilities2,405
 2,359
Total Liabilities8,708
 9,330
Redeemable Noncontrolling Interests
 164
Common Stockholder's Equity:   
Common stock, par value $0.01 per share —   
Authorized — 1,000,000 shares   
Outstanding — 1,000 shares
 
Paid-in capital3,662
 3,671
Retained earnings1,478
 724
Accumulated other comprehensive income(2) 35
Total common stockholder's equity5,138
 4,430
Noncontrolling Interests1,360
 1,245
Total Stockholders' Equity6,498
 5,675
Total Liabilities and Stockholders' Equity$15,206
 $15,169
Commitments and Contingent Matters (See notes)

 
The accompanying notes are an integral part of these consolidated financial statements.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
For the Years Ended December 31, 2017, 2016, and 2015
Southern Power Company and Subsidiary Companies 2017 Annual Report
 Number of Common Shares Issued Common Stock Paid-In Capital Retained Earnings
 Accumulated Other Comprehensive Income Total Common Stockholder's Equity 
Noncontrolling Interests(a)
 Total
 (in millions)
Balance at December 31, 2014
 $
 $1,176
 $573
 $3
 $1,752
 $219
 $1,971
Net income attributable
   to Southern Power

 
 
 215
 
 215
 
 215
Capital contributions from
   parent company

 
 646
 
 
 646
 
 646
Other comprehensive income
 
 
 
 1
 1
 
 1
Cash dividends on common
   stock

 
 
 (131) 
 (131) 
 (131)
Capital contributions from
   noncontrolling interests

 
 
 
 
 
 567
 567
Distributions to noncontrolling
   interests

 
 
 
 
 
 (17) (17)
Net loss attributable to
   noncontrolling interests

 
 
 
 
 
 12
 12
Balance at December 31, 2015
 
 1,822
 657
 4
 2,483
 781
 3,264
Net income attributable
   to Southern Power

 
 
 338
 
 338
 
 338
Capital contributions from
   parent company

 
 1,850
 
 
 1,850
 
 1,850
Other comprehensive income
 
 
 
 31
 31
 
 31
Cash dividends on common
   stock

 
 
 (272) 
 (272) 
 (272)
Capital contributions from
   noncontrolling interests

 
 
 
 
 
 618
 618
Distributions to noncontrolling
   interests

 
 
 
 
 
 (57) (57)
Purchase of membership interests
   from noncontrolling interests

 
 
 
 
 
 (129) (129)
Net income attributable to
   noncontrolling interests

 
 
 
 
 
 32
 32
Other
 
 (1) 1
 
 
 
 
Balance at December 31, 2016
 
 3,671
 724
 35
 4,430
 1,245
 5,675
Net income attributable
   to Southern Power

 
 
 1,071
 
 1,071
 
 1,071
Capital contributions from
   parent company

 
 (2) 
 
 (2) 
 (2)
Other comprehensive income
 
 
 
 (10) (10) 
 (10)
Cash dividends on common
   stock

 
 
 (317) 
 (317) 
 (317)
Other comprehensive income
   transfer from SCS (b)

 
 
 
 (27) (27) 
 (27)
Capital contributions from
   noncontrolling interests

 
 
 
 
 
 79
 79
Distributions to noncontrolling
   interests

 
 
 
 
 
 (122) (122)
Net income attributable to
   noncontrolling interests
��
 
 
 
 
 
 44
 44
Reclassification from redeemable
noncontrolling interests

 
 
 
 
 
 114
 114
Other
 
 (7) 
 
 (7) 
 (7)
Balance at December 31, 2017
 $
 $3,662
 $1,478
 $(2) $5,138
 $1,360
 $6,498
(a)Excludes redeemable noncontrolling interests. See Note 10 to the financial statements under "Noncontrolling Interests" for additional information.
(b)In connection with the Company becoming a participant to the Southern Company qualified pension plan and other postretirement benefit plan, $27 million of other comprehensive income, net of tax of $9 million, was transferred from SCS.
The accompanying notes are an integral part of these consolidated financial statements.

COMBINED NOTES TO FINANCIAL STATEMENTS
Southern Power Company and Subsidiary Companies 2017 Annual Report




Index to the Notes to Financial Statements




NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
Southern Power Company is a wholly-owned subsidiary of Southern Company, which is also the parent company of four traditional electric operating companies, Southern Company Gas (as of July 1, 2016), SCS, and other direct and indirect subsidiaries. The traditional electric operating companies – Alabama Power, Georgia Power, Gulf Power, and Mississippi Power – are vertically integrated utilities providing electric service in four Southeastern states. Southern Power Company and its subsidiaries (the Company) develop, construct, acquire, own, and manage power generation assets, including renewable energy projects, and sell electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through utilities in seven states and is involved in several other complementary businesses including gas marketing services, wholesale gas services, and gas midstream operations. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies.
Effective in December 2017, 538 employees transferred from SCS to the Company. The Company became obligated for related employee costs including pension, other postretirement benefits, and stock-based compensation and has recognized the respective balance sheet assets and liabilities, including AOCI impacts, in its balance sheet at December 31, 2017. Prior to the transfer of employees, the Company's agreements with SCS provided for employee services rendered at amounts in compliance with FERC regulations. The Company adopted the same compensation and benefits plans that SCS has and, therefore, future expenses are not expected to be materially different on a per employee basis.
The preparation of consolidated financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates. Certain prior years' data presented in the consolidated financial statements have been reclassified to conform to the current year presentation.
The consolidated financial statements include the accounts of Southern Power Company and its wholly-owned and majority-owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing or amounts of revenue recognized in the Company's financial statements. Some contractual arrangements, such as certain capacity and energy payments, are excluded from the scope of ASC 606 and included in the scope of the current leasing guidance or the current derivative guidance.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. The adoption of ASC 606 did not result in a cumulative adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases where the majority relate to land leases for its renewable generation

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

facilities. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet for lessee arrangements.
Other
In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18). ASU 2016-18 eliminates the need to reflect transfers between cash and restricted cash in operating, investing, and financing activities in the statement of cash flows. Upon adoption, the net change in cash and cash equivalents during the period will include amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, and will be applied retrospectively to each period presented. The Company adopted ASU 2016-18 effective January 1, 2018 with no material impact on its financial statements.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in other income (expense) in the income statement. Additionally, only the service cost component related to construction labor is eligible for capitalization, when applicable. The Company adopted ASU 2017-07 which is effective for periods beginning after December 15, 2017; however, since the Company became a sponsor of a qualified pension plan and postretirement benefit plan in December 2017, no retrospective presentation of net periodic benefits costs for 2016 or 2017 is required. See Note 2 for additional information.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
Affiliate Transactions
Total revenues from all PPAs with affiliates, included in wholesale revenue affiliates on the consolidated statements of income, were $233 million, $258 million, and $219 million for the years ended December 31, 2017, 2016, and 2015, respectively. Included within these revenues were affiliate PPAs accounted for as operating leases, which totaled $81 million for the year ended December 31, 2017 and $109 million for each of the years ended December 31, 2016 and 2015.
The Company has an agreement with SCS under which the following services are rendered to the Company at amounts in compliance with FERC regulation: general and design engineering, purchasing, accounting, finance and treasury, tax, information technology, marketing, auditing, insurance and pension administration, human resources, systems and procedures, digital wireless communications, labor, and other services with respect to business and operations, construction management, and transactions associated with the Southern Company system's fleet of generating units. Prior to December 2017, the Company did not have employees and thus all employee-related charges were rendered at amounts in compliance with FERC regulation under agreements with SCS. Costs for all of these services from SCS totaled $218 million, $193 million, and $146 million for the years ended December 31, 2017, 2016, and 2015, respectively. Of these costs, $192 million, $173 million, and $138 million for the years ended December 31, 2017, 2016, and 2015, respectively, were charged to other operations and maintenance expenses; the remainder was primarily capitalized to property, plant, and equipment. Cost allocation methodologies used by SCS prior to the repeal of the Public Utility Holding Company Act of 1935, as amended, were approved by the SEC. Subsequently, additional cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies.
Total power purchased from affiliates through the power pool, included in purchased power in the consolidated statements of income, totaled $27 million for the year ended December 31, 2017 and $21 million for each of the years ended December 31, 2016 and 2015.
The Company also has several agreements with SCS for transmission services. Transmission services purchased from SCS totaled $13 million for the year ended December 31, 2017 and $11 million for each of the years ended December 31, 2016 and 2015 and were charged to other operations and maintenance in the consolidated statements of income. All charges were billed to the Company based on the Southern Company Open Access Transmission Tariff as filed with the FERC.
Prior to Southern Company's acquisition of Southern Company Gas, SCS, as agent for the Company, had agreements with various subsidiaries of Southern Company Gas to purchase natural gas. Natural gas purchases made by the Company from Southern Company Gas' subsidiaries were $119 million for the year ended December 31, 2017 and $17 million for the period subsequent to

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Southern Company's acquisition of Southern Company Gas through December 31, 2016, and are included in fuel expense on the consolidated statements of income.
On September 1, 2016, Southern Company Gas acquired a 50% equity interest in Southern Natural Gas Company, L.L.C. (SNG). Prior to completion of the acquisition, SCS, as agent for the Company, had entered into a long-term interstate natural gas transportation agreement with SNG. The interstate transportation service provided to the Company by SNG pursuant to this agreement is governed by the terms and conditions of SNG's natural gas tariff and is subject to FERC regulation. Transportation costs under this agreement were $25 million for the year ended December 31, 2017 and $7 million for the period subsequent to Southern Company Gas' investment in SNG through December 31, 2016.
The Company and the traditional electric operating companies may jointly enter into various types of wholesale energy, natural gas, and certain other contracts, either directly or through SCS as agent. Each participating company may be jointly and severally liable for the obligations incurred under these agreements. See "Revenues" herein for additional information. The Company and the traditional electric operating companies generally settle amounts related to the above transactions on a monthly basis in the month following the performance of such services or the purchase or sale of electricity.
Acquisition Accounting
The Company may acquire generation assets as part of its overall growth strategy. At the time of an acquisition, the Company will assess if these assets and activities meet the definition of a business. For acquisitions that meet the definition of a business, the Company includes operating results from the date of acquisition in its consolidated financial statements. The purchase price, including any contingent consideration, is allocated based on the fair value of the identifiable assets acquired and liabilities assumed (including any intangible assets). Assets acquired that do not meet the definition of a business are accounted for as an asset acquisition.
The purchase price of each asset acquisition is allocated based on the relative fair value of assets acquired. Determining the fair value of assets acquired and liabilities assumed requires management judgment and the Company may engage independent valuation experts to assist in this process. Fair values are determined by using market participant assumptions, and typically include the timing and amounts of future cash flows, incurred construction costs, the nature of acquired contracts, discount rates, power market prices, and expected asset lives. Any due diligence or transition costs incurred by the Company for potential or successful acquisitions are expensed as incurred.
Contingent consideration primarily relates to fixed amounts due to the seller once the facility is placed in service. For contingent consideration with variable payments, the Company fair values the arrangement with any changes recorded in the consolidated statements of income. See Note 8 for additional fair value information.
Revenues
The Company sells capacity at rates specified under contractual terms for long-term PPAs. These PPAs are generally accounted for as operating leases, non-derivatives, or normal sale derivatives. Capacity revenues from PPAs classified as operating leases are recognized on a straight-line basis over the term of the agreement. Capacity revenues from PPAs classified as non-derivatives or normal sales are recognized at the lesser of the levelized amount or the amount billable under the contract over the respective contract periods. When multiple contracts exist with the same counterparty, the revenues from each contract are accounted for as separate arrangements. All capacity revenues are included in wholesale revenues.
The Company may also enter into contracts to sell short-term capacity in the wholesale electricity markets. These sales are generally classified as mark-to-market derivatives and net unrealized gains (losses) on such contracts are recorded in wholesale revenues. See Note 9 for additional information.
Energy revenues and other contingent revenues are recognized in the period the energy is delivered or the service is rendered. Transmission revenues and other fees are recognized as earned as other operating revenues. See "Financial Instruments" herein for additional information.

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Significant portions of the Company's revenues have been derived from certain customers pursuant to PPAs. The following table shows the percentage of total revenues for the Company's top three customers for each of the years presented:
 2017 2016 2015
Georgia Power11.3% 16.5% 15.8%
Duke Energy Corporation6.7% 7.8% 8.2%
Morgan Stanley Capital Group4.5% N/A
 N/A
San Diego Gas & Electric CompanyN/A
 5.7% N/A
Florida Power & Light CompanyN/A
 N/A
 10.7%
Fuel Costs
Fuel costs are expensed as the fuel is used. Fuel costs also include emissions allowances which are expensed as the emissions occur.
Development Costs
The Company capitalizes development costs once a project is probable of completion, primarily based on a review of its economics and operational feasibility, as well as status of power off-take agreements and regulatory approvals, if applicable. Capitalized development costs are included in construction work in progress on the consolidated balance sheets. All development costs incurred prior to the determination that a project is probable of completion are expensed as incurred and included in other operations and maintenance expense in the consolidated statements of income. If it is determined that a project is no longer probable of completion, any capitalized development costs are expensed and included in other operations and maintenance expense in the consolidated statements of income.
Income and Other Taxes
The Company uses the liability method of accounting for deferred income taxes and provides deferred income taxes for all significant income tax temporary differences.
Under current tax regulation, certain projects related to the construction of renewable facilities are eligible for federal ITCs. The Company estimates eligible costs which, as they relate to acquisitions, may not be finalized until the allocation of the purchase price to assets has been finalized. The Company applies the deferred method to ITCs as opposed to the flow-through method. Under the deferred method the ITCs are recorded as a deferred credit and amortized to income tax expense over the life of the respective asset. Furthermore, the tax basis of the asset is reduced by 50% of the ITCs received, resulting in a net deferred tax asset. The Company has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. In addition, certain projects are eligible for federal PTCs, which are recorded as an income tax benefit based on KWH production. Federal ITCs and PTCs available to reduce income taxes payable were not fully utilized during 2017 and will be carried forward and utilized in future years. The Company recognizes tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 5 for additional information.
Property, Plant, and Equipment
The Company's depreciable property, plant, and equipment consists primarily of generation assets.5. PROPERTY, PLANT, AND EQUIPMENT
Property, plant, and equipment is stated at original cost or acquired fair value.value at acquisition, as appropriate, less any regulatory disallowances and impairments. Original cost includes: materials, direct labor incurred by contractorsmay include: materials; labor; minor items of property; appropriate administrative and affiliated companies,general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized. Interest is capitalized on qualifying projectsand/or cost of equity funds used during construction.
The Registrants' property, plant, and equipment in service consisted of the developmentfollowing at December 31, 2023 and construction period. 2022:
At December 31, 2023:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Electric utilities:
Generation$57,325 $16,584 $22,587 $2,909 $14,649 $ 
Transmission15,561 6,152 8,402 966   
Distribution26,482 9,775 15,380 1,327   
General/other6,305 2,918 3,001 321 41  
Electric utilities' plant in service105,673 35,429 49,370 5,523 14,690  
Southern Company Gas:
Natural gas transportation and distribution17,798     17,798 
Storage facilities1,565     1,565 
Other1,477     1,477 
Southern Company Gas plant in service20,840     20,840 
Other plant in service1,915      
Total plant in service$128,428 $35,429 $49,370 $5,523 $14,690 $20,840 
At December 31, 2022:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Electric utilities:
Generation$51,756 $15,920 $17,755 $2,826 $14,619 $— 
Transmission14,201 5,658 7,576 927 — — 
Distribution24,200 9,154 13,819 1,228 — — 
General/other5,806 2,740 2,729 273 39 — 
Electric utilities' plant in service95,963 33,472 41,879 5,254 14,658 — 
Southern Company Gas:
Natural gas transportation and distribution16,810 — — — — 16,810 
Storage facilities1,553 — — — — 1,553 
Other1,360 — — — — 1,360 
Southern Company Gas plant in service19,723 — — — — 19,723 
Other plant in service1,843 — — — — — 
Total plant in service$117,529 $33,472 $41,879 $5,254 $14,658 $19,723 
The cost to replace significantof replacements of property, exclusive of minor items of property, defined as retirement units is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed with the exception of nuclear refueling costs and certain maintenance costs including those described below.
In accordance with orders from their respective state PSCs, Alabama Power and Georgia Power defer nuclear refueling outage operations and maintenance expenses to a regulatory asset when the charges are incurred. Alabama Power amortizes the costs over a subsequent 18-month period with Plant Farley's fall outage cost amortization beginning in January of the following year and spring outage cost amortization beginning in July of the same year. Georgia Power amortizes its costs over each unit's
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operating cycle, or 18 months for Plant Vogtle Units 1, 2, and 3 and 24 months for Plant Hatch Units 1 and 2. Georgia Power's amortization period begins the month the refueling outage starts.
A portion of Mississippi Power's railway track maintenance costs is charged to fuel stock and recovered through Mississippi Power's fuel clause.
The portion of Southern Company Gas' non-working gas used to maintain the structural integrity of natural gas storage facilities that is considered to be non-recoverable is depreciated, while the recoverable or retained portion is not depreciated.
See Note 9 for information on finance lease right-of-use (ROU) assets, net, which are included in property, plant, and equipment.
The Registrants have deferred certain implementation costs related to cloud hosting arrangements. At December 31, 2023 and 2022, deferred cloud implementation costs, net of amortization, which are generally included in other deferred charges and assets on the Registrants' balance sheets, are as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred cloud implementation costs, net:
At December 31, 2023$325 $85 $99 $13 $15 $43 
At December 31, 2022345 81 108 14 18 54 
Once a hosted software is placed into service, the related deferred costs are amortized on a straight-line basis over the remaining expected hosting arrangement term, including any renewal options that are reasonably certain of exercise. The amortization is reflected with the associated cloud hosting fees, which are generally reflected in other operations and maintenance expenses on the Registrants' statements of income. In 2023, amortization of deferred cloud implementation costs recognized was $46 million for Southern Company, $11 million for Alabama Power, $19 million for Georgia Power, $8 million for Southern Company Gas, and immaterial for the other Registrants. In 2022, amortization of deferred cloud implementation costs recognized was $29 million for Southern Company, $8 million for Alabama Power, $12 million for Georgia Power, and immaterial for the other Registrants. In 2021, amortization from deferred cloud implementation costs recognized was immaterial for all Registrants.
See Note 2 under "Regulatory Assets and Liabilities" and "Alabama Power – Software Accounting Order" for information on deferrals of certain other operations and maintenance costs associated with software and cloud computing projects by the traditional electric operating companies and natural gas distribution utilities, as authorized by their respective state PSCs or applicable state regulatory agencies.
Depreciation and Amortization
The traditional electric operating companies' and Southern Company Gas' depreciation of the original cost of utility plant in service is provided primarily by using composite straight-line rates. The approximate rates for 2023, 2022, and 2021 are as follows:
202320222021
Alabama Power4.1 %2.7 %2.7 %
Georgia Power3.8 %3.3 %3.3 %
Mississippi Power3.4 %3.4 %3.6 %
Southern Company Gas2.7 %2.7 %2.8 %
Depreciation studies are conducted periodically to update the composite rates. These studies are filed with the respective state PSC and/or other applicable state and federal regulatory agencies for the traditional electric operating companies and the natural gas distribution utilities. Effective January 1, 2023, Alabama Power's and Georgia Power's depreciation rates were revised. See Note 2 for additional information.
When property, plant, and equipment subject to composite depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the asset are retired when the related property unit is retired.
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At December 31, 2023 and 2022, accumulated depreciation for Southern Company and Southern Company Gas consisted of utility plant in service totaling $36.6 billion and $34.3 billion, respectively, for Southern Company and $5.3 billion and $5.1 billion, respectively, for Southern Company Gas, as well as other plant in service totaling $1.1 billion and $1.0 billion, respectively, for Southern Company and $210 million and $184 million, respectively, for Southern Company Gas. Other plant in service includes the non-utility assets of Southern Company Gas, as well as, for Southern Company, certain other non-utility subsidiaries. Depreciation of the original cost of other plant in service is provided primarily on a straight-line basis over estimated useful lives. Useful lives for Southern Company Gas's non-utility assets range from five to 12 years for transportation equipment, 30 to 75 years for storage facilities, and up to 75 years for other assets. Useful lives for the assets of Southern Company's other non-utility subsidiaries range up to 30 years.
Southern Power
Southern Power applies component depreciation, where depreciation is computed principally by the straight-line method over the estimated useful life of the asset. Certain of Southern Power's generation assets related to natural gas-fired facilities are depreciated on a units-of-production basis, using hours or starts, to better match outage and maintenance costs to the usage of, and revenues from, these assets. The primary assets in Southern Power's property, plant, and equipment are generating facilities, which generally have estimated useful lives as follows:
Southern Power Generating FacilityUseful life
Natural gasUp to 50 years
SolarUp to 35 years
WindUp to 35 years
When Southern Power's depreciable property, plant, and equipment is retired, or otherwise disposed of in the normal course of business, the applicable cost and accumulated depreciation is removed and a gain or loss is recognized in the consolidated statements of income.
Depreciation
The Company applies component depreciation, where depreciation is computed principally by the straight-line method over the estimated useful life of the asset. Certain generation assets related to natural gas-fired facilities are depreciated on a units-of-

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

production basis, using hours or starts, to better match outage and maintenance costs to the usage of, and revenues from, these assets.
The primary assets in property, plant, and equipment are generating facilities, which generally have estimated useful lives as follows:
Generating facilityUseful life
Natural gasUp to 45 years
BiomassUp to 40 years
SolarUp to 35 years
WindUp to 30 years
The Company reviews its estimated useful lives and salvage values on an ongoing basis. The results of these reviews could result in changes which could have a material impact on Southern Power's net incomeincome.
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Joint Ownership Agreements
At December 31, 2023, the Registrants' percentage ownership and investment (exclusive of nuclear fuel) in jointly-owned facilities in commercial operation were as follows:
Facility (Type)Percent
Ownership
Plant in ServiceAccumulated
Depreciation
CWIP
(in millions)
Alabama Power
Greene County (natural gas) Units 1 and 260.0 %(a)$191 $113 $
Plant Miller (coal) Units 1 and 291.8 (b)2,156 778 40 
Georgia Power
Plant Hatch (nuclear) Units 1 and 250.1 %(c)$1,446 $659 $70 
Plant Vogtle (nuclear) Units 1 and 245.7 (c)3,664 2,331 62 
Plant Vogtle (nuclear) Units 3 and 445.7 (c)(d)4,613 19 3,232 
Plant Scherer (coal) Units 1 and 28.4 (c)287 123 
Plant Scherer (coal) Unit 375.0 (c)1,310 639 10 
Rocky Mountain (pumped storage)25.4 (e)181 153 — 
Mississippi Power
Greene County (natural gas) Units 1 and 240.0 %(a)$125 $80 $— 
Plant Daniel (coal) Units 1 and 250.0 (f)805 281 
Southern Company Gas
Dalton Pipeline (natural gas pipeline)50.0 %(g)$271 $27 $— 
(a)Jointly owned by Alabama Power and Mississippi Power and operated and maintained by Alabama Power.
(b)Jointly owned with PowerSouth and operated and maintained by Alabama Power.
(c)Georgia Power owns undivided interests in Plants Hatch, Vogtle, and Scherer in varying amounts jointly with one or more of the following entities: OPC, MEAG Power, Dalton, FP&L, and JEA. Georgia Power has been contracted to operate and maintain the plants as agent for the co-owners and is jointly and severally liable for third party claims related to these plants.
(d)Unit 4 remains under construction. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
(e)Jointly owned with OPC, which is the operator of the plant.
(f)Jointly owned by FP&L and Mississippi Power. In accordance with the operating agreement, Mississippi Power acts as FP&L's agent with respect to the operation and maintenance of these units. See Note 3 under "Other Matters – Mississippi Power – Plant Daniel" for additional information.
(g)Jointly owned with The Williams Companies, Inc., the Dalton Pipeline is a 115-mile natural gas pipeline that serves as an extension of the Transcontinental Gas Pipe Line Company, LLC pipeline system into northwest Georgia. Southern Company Gas leases its 50% undivided ownership for approximately $26 million annually through 2042. The lessee is responsible for maintaining the pipeline during the lease term and for providing service to transportation customers under its FERC-regulated tariff.
The Registrants' proportionate share of their jointly-owned facility operating expenses is included in the near term.corresponding operating expenses in the statements of income and each Registrant is responsible for providing its own financing.
Asset Retirement ObligationsAssets Subject to Lien
Asset retirement obligations (ARO)Mississippi Power provides retail service to its largest retail customer, Chevron Products Company (Chevron), at its refinery in Pascagoula, Mississippi through at least 2038 in accordance with agreements approved by the Mississippi PSC. The agreements grant Chevron a security interest in the co-generation assets located at the refinery and owned by Mississippi Power, with a lease receivable balance of $147 million at December 31, 2023, that is exercisable upon the occurrence of (i) certain bankruptcy events or (ii) other events of default coupled with specific reductions in steam output at the facility and a downgrade of Mississippi Power's credit rating to below investment grade by two of the three rating agencies. See Note 9 under "Lessor" for additional information.
See Note 8 under "Long-term Debt" for information regarding debt secured by certain assets of Georgia Power and Southern Company Gas.
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6. ASSET RETIREMENT OBLIGATIONS
AROs are computed as the present value of the estimated ultimate costs for an asset's future retirement and are recorded in the period in which the liability is incurred. The estimated costs are capitalized as part of the related long-lived asset and depreciated over the asset's useful life. In the absence of quoted market prices, AROs are estimated using present value techniques in which estimates of future cash outlays associated with the asset retirements are discounted using a credit-adjusted risk-free rate. Estimates of the timing and amounts of future cash outlays are based on projections of when and how the assets will be retired and the cost of future removal activities. Each traditional electric operating company and natural gas distribution utility has received accounting guidance from its state PSC or applicable state regulatory agency allowing the continued accrual or recovery of other retirement costs for long-lived assets that it does not have a legal obligation to retire. Accordingly, the accumulated removal costs for these obligations are reflected in the balance sheets as regulatory liabilities and amounts to be recovered are reflected in the balance sheets as regulatory assets.
The ARO liabilities for the traditional electric operating companies primarily relate to facilities that are subject to the CCR Rule and the related state rules, principally ash ponds. In addition, Alabama Power and Georgia Power have retirement obligations related to the decommissioning of nuclear facilities (Alabama Power's Plant Farley and Georgia Power's ownership interests in Plant Hatch and Plant Vogtle Units 1 through 3). See "Nuclear Decommissioning" herein for additional information. Other significant AROs include various landfill sites and asbestos removal for Alabama Power, Georgia Power, and Mississippi Power and gypsum cells and mine reclamation for Mississippi Power. The ARO liability for Southern Power primarily relates to the Company'sits solar and wind facilities, which are located on long-term land leases requiring the restoration of land at the end of the lease. See Note 11
The traditional electric operating companies and Southern Company Gas also have identified other retirement obligations, such as obligations related to certain electric transmission and distribution facilities, certain asbestos-containing material within long-term assets not subject to ongoing repair and maintenance activities, certain wireless communication towers, the disposal of polychlorinated biphenyls in certain transformers, leasehold improvements, equipment on customer property, and property associated with the Southern Company system's rail lines and natural gas pipelines. However, liabilities for acquisitions during 2017the removal of these assets have not been recorded because the settlement timing for certain retirement obligations related to these assets is indeterminable and, 2016 which contributedtherefore, the fair value of the retirement obligations cannot be reasonably estimated. A liability for these retirement obligations will be recognized when sufficient information becomes available to support a reasonable estimation of the increased liability.ARO.
Southern Company and the traditional electric operating companies will continue to recognize in their respective statements of income allowed removal costs in accordance with regulatory treatment. Any differences between costs recognized in accordance with accounting standards related to asset retirement and environmental obligations and those reflected in rates are recognized as either a regulatory asset or liability in the balance sheets as ordered by the various state PSCs.
Details of the AROs included onin the consolidated balance sheets are as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi Power
Southern Power(*)
(in millions)
Balance at December 31, 2021$11,687 $4,334 $6,824 $190 $131 
Liabilities incurred36 — 35 — — 
Liabilities settled(455)(205)(212)(20)— 
Accretion expense406 158 231 
Cash flow revisions(834)— (844)
Balance at December 31, 2022$10,840 $4,287 $6,034 $179 $144 
Liabilities incurred90  90   
Liabilities settled(617)(270)(304)(18) 
Accretion expense403 156 230 5 6 
Cash flow revisions(399)(15)(385)2  
Balance at December 31, 2023$10,317 $4,158 $5,665 $168 $150 
(*)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.
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 2017  2016 
 (in millions) 
Balance at beginning of year$64
  $21
 
Liabilities incurred6
  42
 
Accretion4
  1
 
Cash flow revisions4
  
 
Balance at end of year$78
  $64
 
In December 2022, Georgia Power recorded a net decrease of approximately $780 million to its AROs related to the CCR Rule and the related state rule resulting from changes in estimates, including lower future inflation rates, higher discount rates, and timing of closure activities, as well as a change in closure methodology for one ash pond as approved in Georgia Power's 2022 IRP.
Long-Term Service AgreementsFollowing initial criticality for Plant Vogtle Unit 3 on March 6, 2023, Georgia Power recorded AROs of approximately $90 million. Subsequent to December 31, 2023, Plant Vogtle Unit 4 achieved initial criticality, which will result in Georgia Power recording AROs of approximately $118 million during the first quarter 2024. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
In September 2023 and November 2023, Georgia Power recorded net decreases of approximately $175 million and $210 million, respectively, to its AROs related to the CCR Rule and the related state rule resulting from changes in estimates, including lower future inflation rates and the timing of closure activities.
In June 2023, Alabama Power completed an updated decommissioning cost site study for Plant Farley. The estimated cost of decommissioning based on the study resulted in a decrease in Alabama Power's ARO liability of approximately $15 million. See "Nuclear Decommissioning" herein for additional information.
The cost estimates for AROs related to the disposal of CCR are based on information at December 31, 2023 using various assumptions related to closure and post-closure costs, timing of future cash outlays, inflation and discount rates, and the potential methods for complying with the CCR Rule and the related state rules. The traditional electric operating companies have periodically updated, and expect to continue periodically updating, their related cost estimates and ARO liabilities for each CCR unit as additional information related to these assumptions becomes available. Some of these updates have been, and future updates may be, material. The cost estimates for Alabama Power are based on closure-in-place for all ash ponds. The cost estimates for Georgia Power and Mississippi Power are based on a combination of closure-in-place for some ash ponds and closure by removal for others. Additionally, the closure designs and plans in the States of Alabama and Georgia are subject to approval by environmental regulatory agencies. Absent continued recovery of ARO costs through regulated rates, results of operations, cash flows, and financial condition for Southern Company has entered into LTSAsand the traditional electric operating companies could be materially impacted. The ultimate outcome of these matters cannot be determined at this time. See Note 3 under "General Litigation Matters – Alabama Power" for additional information.
Nuclear Decommissioning
The NRC requires licensees of commercial nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. Alabama Power and Georgia Power have external trust funds (Funds) to comply with the purposeNRC's regulations. Use of securing maintenance support forthe Funds is restricted to nuclear decommissioning activities. The Funds are managed and invested in accordance with applicable requirements of various regulatory bodies, including the NRC, the FERC, and state PSCs, as well as the IRS. While Alabama Power and Georgia Power are allowed to prescribe an overall investment policy to the Funds' managers, neither Southern Company nor its natural gas-fired generating facilities.subsidiaries or affiliates are allowed to engage in the day-to-day management of the Funds or to mandate individual investment decisions. Day-to-day management of the investments in the Funds is delegated to unrelated third-party managers with oversight by the management of Alabama Power and Georgia Power. The LTSAs cover all planned inspectionsFunds' managers are authorized, within certain investment guidelines, to actively buy and sell securities at their own discretion in order to maximize the return on the covered equipment, which generally includesFunds' investments. The Funds are invested in a tax-efficient manner in a diversified mix of equity and fixed income securities and are reported as trading securities.
Alabama Power and Georgia Power record the costinvestment securities held in the Funds at fair value, as disclosed in Note 13, as management believes that fair value best represents the nature of all laborthe Funds. Gains and materials. The LTSAs also obligate the counterparties to cover the costs of unplanned maintenance on the covered equipment subject to limits and scope specified in each contract.
Payments made under the LTSAs prior to the performance of any planned inspectionslosses, whether realized or unplanned capital maintenanceunrealized, are recorded as a prepayment in other current assets and noncurrent assets on the consolidatedregulatory liability for AROs in the balance sheets and are recordednot included in net income or OCI. Fair value adjustments and realized gains and losses are determined on a specific identification basis.
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COMBINED NOTES TO FINANCIAL STATEMENTS

Investment securities in the Funds for December 31, 2023 and 2022 were as payments pursuantfollows:
Southern CompanyAlabama
Power
Georgia
Power
(in millions)
At December 31, 2023:
Equity securities$1,288 $796 $492 
Debt securities895 277 618 
Other securities239 186 53 
Total investment securities in the Funds$2,422 $1,259 $1,163 
At December 31, 2022:
Equity securities$1,095 $690 $405 
Debt securities838 267 571 
Other securities210 168 42 
Total investment securities in the Funds(*)
$2,143 $1,125 $1,018 
(*)For Southern Company and Georgia Power, these amounts include investment securities pledged to LTSAscreditors and collateral received and excludes payables related to a securities lending program Georgia Power's Funds previously participated in through the managers of the Funds. Under this program, Georgia Power's Funds' investment securities were loaned to institutional investors for equipment not yeta fee. Securities loaned were fully collateralized by cash, letters of credit, and/or securities issued or guaranteed by the U.S. government or its agencies or instrumentalities. At December 31, 2022, approximately $35 million of the fair market value of Georgia Power's Funds' securities were on loan and pledged to creditors under the Funds' managers' securities lending program. At December 31, 2022, the fair value of the collateral received was approximately $36 million and could only be sold by the borrower upon the return of the loaned securities. The collateral received was treated as a non-cash item in the statements of cash flows. At the time work is performed, which typically occurs during planned inspections, an appropriate amount is transferred from the prepayment
These amounts exclude receivables related to property, plant,investment income and equipment or chargedpending investment sales and payables related to expense. pending investment purchases.
The receipt of major parts into materials and supplies inventory prior to planned inspections is treated as a noncash transaction for purposesfair value increases (decreases) of the consolidatedFunds, including unrealized gains (losses) and reinvested interest and dividends and excluding the Funds' expenses, for 2023, 2022, and 2021 are shown in the table below.
Southern CompanyAlabama
Power
Georgia
Power
(in millions)
Fair value increases (decreases)
2023$281 $157 $124 
2022(360)(171)(189)
2021274 200 74 
Unrealized gains (losses)
At December 31, 2023$241 $119 $122 
At December 31, 2022(391)(204)(187)
At December 31, 2021(27)(30)
The investment securities held in the Funds continue to be managed with a long-term focus. Accordingly, all purchases and sales within the Funds are presented separately in the statements of cash flows.flows as investing cash flows, consistent with the nature of the securities and purpose for which the securities were acquired.
Impairment of Long-Lived AssetsFor Alabama Power, approximately $13 million and Intangibles$14 million at December 31, 2023 and 2022, respectively, previously recorded in internal reserves is being transferred into the Funds through 2040 as approved by the Alabama PSC.
The Company evaluates long-lived assets and finite-lived intangibles for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The Company's intangible assets consist primarily of certain PPAs acquired, whichNRC's minimum external funding requirements are amortized over the termbased on a generic estimate of the PPAs, which havecost to decommission only the radioactive portions of a weighted average term of 19 years. The determination of whether an impairment has occurred isnuclear unit based on an estimatethe size and type of undiscounted future cash flows attributablereactor. Alabama Power and Georgia Power have filed plans with the NRC designed to ensure that, over time, the deposits and earnings of the Funds will provide the minimum funding amounts prescribed by the NRC.
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COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Southern Power Company and Subsidiary Companies 2017 Annual Report

At December 31, 2023 and 2022, the accumulated provisions for the external decommissioning trust funds were as follows:
assets,
20232022
(in millions)
Alabama Power
Plant Farley$1,259 $1,125 
Georgia Power
Plant Hatch$705 $628 
Plant Vogtle Units 1 and 2434 382 
Plant Vogtle Units 3 and 424 
Total$1,163 $1,018 
Site study cost is the estimate to decommission a specific facility as compared with the carrying value of the assets. If the estimate of undiscounted future cash flows is less than the carrying valuesite study year. The decommissioning cost estimates are based on removal of the asset,plant from service and prompt dismantlement. The actual decommissioning costs may vary from these estimates because of changes in the fair valueassumed date of decommissioning, changes in NRC requirements, or changes in the asset is determined and a loss is recorded.
Amortization expense for acquired PPAs was $25 million, $10 million, and $3 million for the years ended December 31, 2017, 2016, and 2015, respectively, and is recordedassumptions used in operating revenues.making these estimates. The estimated annual amortization expense is $25 million for eachcosts of the next five years.
Transmission Receivables/Prepayments
As a result of the Company's growth from the acquisition and construction of generating facilities, the Company has transmission receivables and/or prepayments representing the portion of interconnection network and transmission upgrades that will be reimbursed to the Company. Upon completion of the related project, transmission costs are generally reimbursed by the interconnection provider within a five-year period and the receivable/prepayments are reduced as payments or services are received.
Restricted Cash
The Company has restricted cash primarily related to certain acquisitions and construction projects. The aggregate amount of restricted cashdecommissioning at December 31, 2017 and 2016 was $11 million and $13 million, respectively.2023 based on the most current studies were as follows:
Cash and Cash Equivalents
Alabama PowerGeorgia Power
Plant
Farley
Plant
 Hatch(*)
Plant Vogtle
 Units 1 and 2(*)
Plant Vogtle
 Unit 3(*)
Most current study year2023202120212020
Decommissioning periods:
Beginning year2037203420472063
Completion year2087207520792074
(in millions)
Site study costs:
Radiated structures$1,402 $771 $628 $284 
Spent fuel management513 186 170 30 
Non-radiated structures133 61 85 33 
Total site study costs$2,048 $1,018 $883 $347 
(*)Based on Georgia Power's ownership interests.
For ratemaking purposes, Alabama Power's decommissioning costs are based on the site study and Georgia Power's decommissioning costs are based on the NRC generic estimate to decommission the radioactive portion of the financial statements, temporary cash investmentsfacilities and the site study estimate for spent fuel management. Significant assumptions used to determine these costs for ratemaking were an estimated inflation rate of 4.5% for Plant Farley, 2.5% for Plants Hatch and Vogtle Units 1 and 2, and 2.4% for Plant Vogtle Unit 3 and an estimated trust earnings rate of 7.0% for Plant Farley, 4.5% for Plants Hatch and Vogtle Units 1 and 2, and 4.4% for Plant Vogtle Unit 3.
Amounts previously contributed to the Funds for Plant Farley are considered cash equivalents. Temporary cash investmentscurrently projected to be adequate to meet the decommissioning obligations. Alabama Power's site-specific estimates of decommissioning costs for Plant Farley are securitiesupdated every five years. The next site study for Alabama Power is expected to be completed in 2028. Projections of funds are reviewed with original maturitiesthe Alabama PSC to ensure that, over time, the deposits and earnings of 90 days or less.the Funds will provide adequate funding to cover the site-specific costs. If necessary, Alabama Power would seek the Alabama PSC's approval to address any changes in a manner consistent with NRC and other applicable requirements.
MaterialsUnder the 2019 ARP, Georgia Power's annual decommissioning cost for ratemaking in 2021 and Supplies2022 was a total of $4 million for Plant Hatch and Plant Vogtle Units 1 and 2. Effective January 1, 2023, as approved in the 2022 ARP, there is no annual decommissioning cost for ratemaking for Plant Hatch and Plant Vogtle Units 1 and 2. Any funding amount required by the NRC during the period covered by the 2022 ARP will be deferred to a regulatory asset and recovery is expected to be determined in Georgia Power's next base rate case. See Note 2 under "Georgia Power – Rate Plans – 2022 ARP" for additional information. Effective August 1, 2023, as approved under the Plant Vogtle Unit 3 and Common Facilities rate proceeding, Georgia Power's
Materials
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COMBINED NOTES TO FINANCIAL STATEMENTS

annual decommissioning cost for ratemaking is $8 million for Plant Vogtle Unit 3. See Note 2 under "Georgia Power – Nuclear Construction – Regulatory Matters" for additional information.
7. CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS
The Registrants may hold ownership interests in a number of business ventures with varying ownership structures. Partnership interests and supplies includeother variable interests are evaluated to determine if each entity is a VIE. If a venture is a VIE for which a Registrant is the average costprimary beneficiary, the assets, liabilities, and results of generating plant materials and are recorded as inventory when purchased and then expensed or capitalized to property, plant, and equipment, as appropriate, at weighted average cost when installed. In addition, certain major parts are recorded as inventory when acquired and then capitalized at cost when installed to property, plant, and equipment.
Fuel Inventory
Fuel inventory, which is included in other current assets, includes the cost of oil, natural gas, biomass, and emissions allowances. The Company maintains oil inventory for use at several natural gas generating units. The Company has contracts in place for natural gas storage to support normal operations of the Company's natural gas generating units.entity are consolidated. The Company also maintains biomass inventory for use at Plant Nacogdoches. InventoryRegistrants reassess the conclusion as to whether an entity is maintained usinga VIE upon certain occurrences, which are deemed reconsideration events.
For entities that are not determined to be VIEs, the weighted average cost method. Fuel inventoryRegistrants evaluate whether they have control or significant influence over the investee to determine the appropriate consolidation and emissions allowances are recorded at actual cost when purchased and then expensed at weighted average cost as used. Emissions allowances granted bypresentation. Generally, entities under the EPA are included at zero cost.
Financial Instruments
The Company uses derivative financial instruments to limit exposure to fluctuations in interest rates, the prices of certain fuel purchases, electricity purchases and sales, and foreign currency exchange rates. All derivative financial instruments are recognized as either assets or liabilities on the consolidated balance sheets (included in "Other") and are measured at fair value. See Note 8 for additional information regarding fair value. Substantially all of the Company's bulk energy purchases and sales contracts that meet the definitioncontrol of a derivativeRegistrant are excluded from fair value accounting requirements because they qualify for the "normal" scope exception,consolidated, and entities over which a Registrant can exert significant influence, but which a Registrant does not control, are accounted for under the accrual method. Derivative contracts that qualify as cash flow hedgesequity method of anticipated transactions resultaccounting.
Investments accounted for under the equity method are recorded within equity investments in unconsolidated subsidiaries in the deferral of related gainsbalance sheets and, losses in AOCI untilfor Southern Company and Southern Company Gas, the hedged transactions occur. Any ineffectiveness arisingequity income is recorded within earnings from cash flow hedges is recognized currently in net income. Other derivative contracts that qualify as fair value hedges are marked to market through current period income and are recordedequity method investments in the financial statement line item where they will eventually settle. Cash flowsstatements of income. See "SEGCO" and "Southern Company Gas" herein for additional information.
Southern Company
At December 31, 2023 and 2022, Southern Holdings had equity method investments totaling $126 million and $112 million, respectively, primarily related to investments in venture capital funds focused on energy and utility investments. Earnings from derivatives are classified onthese investments were immaterial for all periods presented.
SEGCO
Alabama Power and Georgia Power own equally all of the statementoutstanding capital stock of cash flowsSEGCO, which owns electric generating units at Plant Gaston with a total rated capacity of 1,020 MWs, as well as associated transmission facilities. Retirement of SEGCO's generating units is currently expected to occur by December 31, 2028. However, Alabama Power, in conjunction with Georgia Power, is evaluating extending the operation of Plant Gaston Units 1 through 4 beyond the indicated retirement date. See Note 2 under "Georgia Power – Integrated Resource Plans" for additional information. Alabama Power and Georgia Power account for SEGCO using the equity method; Southern Company consolidates SEGCO. The capacity of these units is sold equally to Alabama Power and Georgia Power. Alabama Power and Georgia Power make payments sufficient to provide for the operating expenses, taxes, interest expense, and a ROE. The share of purchased power included in purchased power, affiliates in the same category asstatements of income totaled $112 million in 2023, $124 million in 2022, and $75 million in 2021 for Alabama Power and $115 million in 2023, $127 million in 2022, and $77 million in 2021 for Georgia Power.
SEGCO paid dividends of $25 million in 2023, $14 million in 2022, and $14 million in 2021, one half of which were paid to each of Alabama Power and Georgia Power. In addition, Alabama Power and Georgia Power each recognize 50% of SEGCO's net income.
Alabama Power, which owns and operates a generating unit adjacent to the hedged item. SEGCO generating units, has a joint ownership agreement with SEGCO for the ownership of an associated gas pipeline. Alabama Power owns 14% of the pipeline with the remaining 86% owned by SEGCO.
See Note 93 under "Guarantees" for additional information regarding derivatives.
The Company offsets the fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a netting arrangement. Additionally, the Company had no outstanding collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2017 or 2016.
The Company is exposed to potential lossesguarantees of Alabama Power and Georgia Power related to financial instruments in the event of counterparties' nonperformance. The Company has established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk.SEGCO.

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income, changes in the fair value of qualifying cash flow hedges, certain changes in pension and other postretirement benefit plans, and reclassifications of amounts included in net income.
Accumulated OCI (loss) balances, net of tax effects, were as follows:
 Qualifying HedgesPension and Other Postretirement Benefit PlansAccumulated Other Comprehensive Income (Loss)
 (in millions)
Balance at December 31, 2016$35
$
$35
Current period change(10)
(10)
Other comprehensive income transfer from SCS(*)

(27)(27)
Balance at December 31, 2017$25
$(27)$(2)
(*)In connection with the Company becoming a participant to the Southern Company qualified pension plan and other postretirement benefit plan, $27 million of OCI, net of tax of $9 million, was transferred from SCS.
Variable Interest Entities
The primary beneficiary of a variable interest entity (VIE) is required to consolidate the VIE when itSouthern Power has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE.
The Company has certain wholly-owned subsidiaries that are determined to be VIEs. The CompanySouthern Power is considered the primary beneficiary of these VIEs because it controls the most significant activities of the VIEs, including operating and maintaining the respective assets, and has the obligation to absorb expected losses of these VIEs to the extent of its equity interests.
SP Solar and SP Wind
2.SP Solar is owned by Southern Power and a limited partner. A wholly-owned subsidiary of Southern Power is the general partner and holds a 1% ownership interest, and another wholly-owned subsidiary of Southern Power owns a 66% ownership interest. The limited partner holds the remaining 33% noncontrolling interest. SP Solar qualifies as a VIE since the arrangement is structured as a limited partnership and the 33% limited partner does not have substantive kick-out rights against the general partner.
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COMBINED NOTES TO FINANCIAL STATEMENTS

At December 31, 2023 and 2022, SP Solar had total assets of $5.6 billion and $5.9 billion, respectively, total liabilities of $0.4 billion, and noncontrolling interests of $1.0 billion and $1.1 billion, respectively. Cash distributions from SP Solar are allocated 67% to Southern Power and 33% to the limited partner in accordance with their partnership interest percentage. Under the terms of the limited partnership agreement, distributions without limited partner consent are limited to available cash and SP Solar is obligated to distribute all such available cash to its partners each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves.
SP Wind is owned by Southern Power and three financial investors. A wholly-owned subsidiary of Southern Power owns 100% of the Class B membership interests and the three financial investors own 100% of the Class A membership interests. SP Wind qualifies as a VIE since the structure of the arrangement is similar to a limited partnership and the Class A members do not have substantive kick-out rights against Southern Power.
At December 31, 2023 and 2022, SP Wind had total assets of $2.1 billion and $2.2 billion, respectively, total liabilities of $187 million and $169 million, respectively, and noncontrolling interests of $38 million and $39 million, respectively. Under the terms of the limited liability agreement, distributions without Class A member consent are limited to available cash and SP Wind is obligated to distribute all such available cash to its members each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves. Cash distributions from SP Wind are generally allocated 60% to Southern Power and 40% to the three financial investors in accordance with the limited liability agreement.
Southern Power consolidates both SP Solar and SP Wind, as the primary beneficiary, since it controls the most significant activities of each entity, including operating and maintaining their assets. Certain transfers and sales of the assets in the VIEs are subject to partner consent and the liabilities are non-recourse to the general credit of Southern Power. Liabilities consist of customary working capital items and do not include any long-term debt.
Other Variable Interest Entities
Southern Power has other consolidated VIEs that relate to certain subsidiaries that have either sold noncontrolling interests to tax equity investors or acquired less than a 100% interest from facility developers. These entities are considered VIEs because the arrangements are structured similar to a limited partnership and the noncontrolling members do not have substantive kick-out rights.
At December 31, 2023 and 2022, the other VIEs had total assets of $1.7 billion and $1.8 billion, respectively, total liabilities of $0.2 billion, and noncontrolling interests of $0.8 billion. Under the terms of the partnership agreements, distributions of all available cash are required each month or quarter and additional distributions require partner consent.
Equity Method Investments
During 2023 and 2022, Southern Power sold its remaining equity method investments in wind projects and received proceeds totaling $50 million and $38 million, respectively. Earnings (loss) from these investments, including the gains associated with the sales, were immaterial for all periods presented.
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COMBINED NOTES TO FINANCIAL STATEMENTS

Southern Company Gas
Equity Method Investments
The carrying amounts of Southern Company Gas' equity method investments at December 31, 2023 and 2022 and related earnings (loss) from those investments for the years ended December 31, 2023, 2022, and 2021 were as follows:
Investment BalanceDecember 31, 2023December 31, 2022
(in millions)
SNG$1,202 $1,243 
Other33 33 
Total$1,235 $1,276 
Earnings (Loss) from Equity Method Investments202320222021
(in millions)
SNG$139 $146 $127 
PennEast Pipeline(*)
 — (81)
Other1 
Total$140 $148 $50 
(*)For 2021, includes pre-tax impairment charges totaling $84 million. See "PennEast Pipeline Project" herein for additional information, including the September 2021 cancellation of the project.
PennEast Pipeline Project
In 2014, Southern Company Gas entered into a partnership in which it holds a 20% ownership interest in the PennEast Pipeline, an interstate pipeline company formed to develop and operate an approximate 118-mile natural gas pipeline between New Jersey and Pennsylvania. In 2019, an appellate court ruled that the PennEast Pipeline does not have federal eminent domain authority over lands in which a state has property rights interests. In June 2021, the U.S. Supreme Court ruled in favor of PennEast Pipeline following a review of the appellate court decision. Southern Company Gas assesses its equity method investments for impairment whenever events or changes in circumstances indicate that the investment may be impaired. Following the U.S. Supreme Court ruling, during the second quarter 2021, Southern Company Gas management reassessed the project construction timing, including the anticipated timing for receipt of a FERC certificate and all remaining state and local permits, as well as potential challenges thereto, and performed an impairment analysis. The outcome of the analysis resulted in a pre-tax impairment charge of $82 million ($58 million after tax). In September 2021, PennEast Pipeline announced that further development of the project was no longer supported, and, as a result, all further development of the project ceased. During the third quarter 2021, Southern Company Gas recorded an additional pre-tax charge of $2 million ($2 million after tax) related to its share of the project level impairment, as well as $7 million of additional tax expense, resulting in total pre-tax charges of $84 million ($67 million after tax) during 2021 related to the project.
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COMBINED NOTES TO FINANCIAL STATEMENTS

8. FINANCING
Long-term Debt
Details of long-term debt at December 31, 2023 and 2022 are provided in the following table:
At December 31, 2023Balance Outstanding at
December 31,
MaturityWeighted Average
Interest Rate
20232022
(in millions)
Southern Company
Senior notes(a)
2024-20734.16%$40,235 $35,683 
Junior subordinated notes2024-20814.33%8,333 8,836 
FFB loans(b)
2024-20442.88%4,788 4,874 
Revenue bonds(c)
2024-20633.77%3,400 2,844 
First mortgage bonds(d)
2025-20633.64%2,500 2,275 
Medium-term notes2026-20277.03%84 84 
Other long-term debt2024-20455.44%234 167 
Finance lease obligations(e)
298 314 
Unamortized fair value adjustment302 330 
Unamortized debt premium (discount), net(198)(193)
Unamortized debt issuance expenses(290)(273)
Total long-term debt59,686 54,941 
Less: Amount due within one year2,476 4,285 
Total long-term debt excluding amount due within one year$57,210 $50,656 
Alabama Power
Senior notes2025-20733.95%$9,875 $9,675 
Revenue bonds(c)
2024-20633.94%1,321 995 
Other long-term debt2026-20307.04%75 45 
Finance lease obligations(e)
Unamortized debt premium (discount), net(20)(18)
Unamortized debt issuance expenses(73)(72)
Total long-term debt11,183 10,630 
Less: Amount due within one year223 301 
Total long-term debt excluding amount due within one year$10,960 $10,329 
Georgia Power
Senior notes2024-20524.34%$9,575 $7,925 
Junior subordinated notes20775.00%270 270 
FFB loans(b)
2024-20442.88%4,788 4,874 
Revenue bonds(c)
2025-20623.64%1,968 1,738 
Finance lease obligations(e)
240 238 
Unamortized debt premium (discount), net(19)(18)
Unamortized debt issuance expenses(122)(117)
Total long-term debt16,700 14,910 
Less: Amount due within one year502 901 
Total long-term debt excluding amount due within one year$16,198 $14,009 
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COMBINED NOTES TO FINANCIAL STATEMENTS

At December 31, 2023Balance Outstanding at
December 31,
MaturityWeighted Average
Interest Rate
20232022
(in millions)
Mississippi Power
Senior notes2024-20514.27%$1,525 $1,425 
Revenue bonds(c)
2025-20524.08%111 111 
Finance lease obligations(e)
16 17 
Unamortized debt premium (discount), net
Unamortized debt issuance expenses(9)(10)
Total long-term debt1,644 1,545 
Less: Amount due within one year201 
Total long-term debt excluding amount due within one year$1,443 $1,544 
Southern Power
Senior notes(a)
2025-20464.05%$2,728 $2,998 
Unamortized debt premium (discount), net(4)(5)
Unamortized debt issuance expenses(13)(14)
Total long-term debt2,711 2,979 
Less: Amount due within one year— 290 
Total long-term debt excluding amount due within one year$2,711 $2,689 
Southern Company Gas
Senior notes2025-20514.36%$4,930 $4,769 
First mortgage bonds(d)
2025-20633.64%2,500 2,275 
Medium-term notes2026-20277.03%84 84 
Other long-term debt2024-20453.81%59 22 
Unamortized fair value adjustment302 330 
Unamortized debt premium (discount), net(8)(8)
Unamortized debt issuance expenses(34)(30)
Total long-term debt7,833 7,442 
Less: Amount due within one year— 400 
Total long-term debt excluding amount due within one year$7,833 $7,042 
(a)Includes a fair value gain (loss) of $(12) million and $(31) million at December 31, 2023 and 2022, respectively, related to Southern Power's foreign currency hedge on its euro-denominated senior notes.
(b)Secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. See "DOE Loan Guarantee Borrowings" herein for additional information.
(c)Revenue bond obligations represent loans to the traditional electric operating companies from public authorities of funds derived from sales by such authorities of revenue bonds issued to finance pollution control and solid waste disposal and wastewater facilities. In some cases, the revenue bond obligations represent obligations under installment sales agreements with respect to facilities constructed with the proceeds of revenue bonds issued by public authorities. The traditional electric operating companies are required to make payments sufficient for the authorities to meet principal and interest requirements of such bonds. Proceeds from certain issuances are restricted until qualifying expenditures are incurred.
(d)Secured by substantially all of Nicor Gas' properties.
(e)Secured by the underlying lease ROU asset. See Note 9 for additional information.
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COMBINED NOTES TO FINANCIAL STATEMENTS

Maturities of long-term debt for the next five years are as follows:
Southern Company(a)
Alabama Power(b)
Georgia
Power(c)
Mississippi Power
Southern Power(d)
Southern Company
Gas
(in millions)
2024$2,480 $223 $503 $201 $— $— 
20254,124 251 849 12 500 300 
20263,791 46 448 66 964 530 
20272,075 551 512 10 — 154 
20282,612 107 864 357 — 150 
(a)See notes (b) and (c) below.
(b)Alabama Power's 2024 maturities include $200 million aggregate principal amount of Series 2023A Floating Rate Senior Notes due May 15, 2073 that are repayable at the option of the holders at certain dates beginning in 2024. As a result, the senior notes are classified as securities due within one year on the balance sheets of Southern Company and Alabama Power at December 31, 2023.
(c)Amounts include principal amortization related to the FFB borrowings; however, the final maturity date is February 20, 2044. See "DOE Loan Guarantee Borrowings" herein for additional information.
(d)Southern Power's 2026 maturities include $564 million of euro-denominated debt at the U.S. dollar denominated hedge settlement amount.
DOE Loan Guarantee Borrowings
Pursuant to the loan guarantee program established under Title XVII of the Energy Policy Act of 2005 (Title XVII Loan Guarantee Program), Georgia Power and the DOE entered into a loan guarantee agreement in 2014 and the Amended and Restated Loan Guarantee Agreement in 2019. Under the Amended and Restated Loan Guarantee Agreement, the DOE agreed to guarantee the obligations of Georgia Power under the FFB Credit Facilities. Under the FFB Credit Facilities, Georgia Power was authorized to make term loan borrowings through the FFB in an amount up to approximately $5.130 billion, provided that total aggregate borrowings under the FFB Credit Facilities could not exceed 70% of (i) Eligible Project Costs minus (ii) approximately $1.492 billion (reflecting the amounts received by Georgia Power under the Guarantee Settlement Agreement less the related customer refunds).
In 2021, Georgia Power made the final borrowings under the FFB Credit Facilities and no further borrowings are permitted. During 2023, Georgia Power made principal amortization payments of $86 million under the FFB Credit Facilities. At December 31, 2023 and 2022, Georgia Power had $4.8 billion and $4.9 billion of borrowings outstanding under the FFB Credit Facilities, respectively.
All borrowings under the FFB Credit Facilities are full recourse to Georgia Power, and Georgia Power is obligated to reimburse the DOE for any payments the DOE is required to make to the FFB under its guarantee. Georgia Power's reimbursement obligations to the DOE are full recourse and secured by a first priority lien on (i) Georgia Power's undivided ownership interest in Plant Vogtle Units 3 and 4 (primarily the units, the related real property, and any nuclear fuel loaded in the reactor core) and (ii) Georgia Power's rights and obligations under the principal contracts relating to Plant Vogtle Units 3 and 4. There are no restrictions on Georgia Power's ability to grant liens on other property.
The final maturity date for each advance under the FFB Credit Facilities is February 20, 2044. Interest is payable quarterly and principal payments began in 2020. Each borrowing under the FFB Credit Facilities bears interest at a fixed rate equal to the applicable U.S. Treasury rate at the time of the borrowing plus a spread equal to 0.375%.
Under the Amended and Restated Loan Guarantee Agreement, Georgia Power is subject to customary borrower affirmative and negative covenants and events of default. In addition, Georgia Power is subject to project-related reporting requirements and other project-specific covenants and events of default.
In the event certain mandatory prepayment events occur, Georgia Power will be required to prepay the outstanding principal amount of all borrowings under the FFB Credit Facilities over a period of five years (with level principal amortization). Among other things, these mandatory prepayment events include (i) the termination of the Vogtle Services Agreement or rejection of the Vogtle Services Agreement in any Westinghouse bankruptcy if Georgia Power does not maintain access to intellectual property rights under the related intellectual property licenses; (ii) termination of the Bechtel Agreement by Bechtel or in connection with a cancellation of Plant Vogtle Units 3 and 4, unless the Vogtle Owners enter into a replacement agreement; (iii) cancellation of Plant Vogtle Unit 4 by the Georgia PSC or by Georgia Power; (iv) failure of the holders of 90% of the ownership interests in Plant Vogtle Units 3 and 4 to vote to continue construction following certain schedule extensions; (v) cost disallowances by the Georgia PSC that could have a material adverse effect on completion of Plant Vogtle Unit 4 or Georgia Power's ability to repay the outstanding borrowings under the FFB Credit Facilities; or (vi) loss of or failure to receive necessary regulatory approvals.
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Under certain circumstances, insurance proceeds and any proceeds from an event of taking must be applied to immediately prepay outstanding borrowings under the FFB Credit Facilities. Georgia Power also may voluntarily prepay outstanding borrowings under the FFB Credit Facilities. Under the FFB Credit Facilities, any prepayment (whether mandatory or optional) will be made with a make-whole premium or discount, as applicable.
In connection with any cancellation of Plant Vogtle Unit 4, the DOE may elect to continue construction of Plant Vogtle Unit 4. In such an event, the DOE will have the right to assume Georgia Power's rights and obligations under the principal agreements relating to Plant Vogtle Units 3 and 4 and to acquire all or a portion of Georgia Power's ownership interest in Plant Vogtle Units 3 and 4.
See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
Secured Debt
Each of Southern Company's subsidiaries is organized as a legal entity, separate and apart from Southern Company and its other subsidiaries. There are no agreements or other arrangements among the Southern Company system companies under which the assets of one company have been pledged or otherwise made available to satisfy obligations of Southern Company or any of its other subsidiaries.
As discussed under "Long-term Debt" herein, the Registrants had secured debt outstanding at December 31, 2023 and 2022. Each Registrant's senior notes, junior subordinated notes, revenue bond obligations, bank term loans, credit facility borrowings, and notes payable are effectively subordinated to all secured debt of each respective Registrant.
Equity Units
In May 2022, Southern Company remarketed $862.5 million aggregate principal amount of its Series 2019A Remarketable Junior Subordinated Notes due August 1, 2024 (2019A RSNs) and $862.5 million aggregate principal amount of its Series 2019B Remarketable Junior Subordinated Notes due August 1, 2027 (2019B RSNs), pursuant to the terms of its 2019 Series A Equity Units (Equity Units). In connection with the remarketing, the interest rates on the 2019A RSNs and the 2019B RSNs were reset to 4.475% and 5.113%, respectively, payable on a semi-annual basis. In August 2022, the proceeds were ultimately used to settle the purchase contracts entered into as part of the Equity Units and Southern Company issued approximately 25.2 million shares of common stock and received proceeds of $1.725 billion. At December 31, 2023 and 2022, the 2019A RSNs and the 2019B RSNs are included on Southern Company's consolidated balance sheets in long-term debt or, as applicable, securities due within one year.
Convertible Senior Notes
In February 2023, Southern Company issued $1.5 billion aggregate principal amount of Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes). In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option.
Interest on the Series 2023A Convertible Senior Notes is payable semiannually, which began on June 15, 2023. The Series 2023A Convertible Senior Notes will mature on December 15, 2025, unless earlier converted or repurchased, but are not redeemable at the option of Southern Company. The Series 2023A Convertible Senior Notes are direct, unsecured, and unsubordinated obligations of Southern Company, ranking equally with all of Southern Company's other unsecured and unsubordinated indebtedness from time to time outstanding, and are effectively subordinated to all secured indebtedness of Southern Company.
Holders may convert their Series 2023A Convertible Senior Notes at their option prior to the close of business on the business day preceding September 15, 2025, but only under the following circumstances:
during any calendar quarter (and only during such calendar quarter), if the last reported sale price of Southern Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day as determined by Southern Company;
during the five business day period after any 10 consecutive trading day period (Measurement Period) in which the trading price per $1,000 principal amount of Series 2023A Convertible Senior Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the common stock and the conversion rate on each such trading day; or
upon the occurrence of certain corporate events specified in the indenture governing the Series 2023A Convertible Senior Notes.
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On or after September 15, 2025, a holder may convert all or any portion of its Series 2023A Convertible Senior Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions.
Southern Company will settle conversions of the Series 2023A Convertible Senior Notes by paying cash up to the aggregate principal amount of the Series 2023A Convertible Senior Notes to be converted and paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at Southern Company's election, in respect of the remainder, if any, of Southern Company's conversion obligation in excess of the aggregate principal amount of the Series 2023A Convertible Senior Notes being converted. The Series 2023A Convertible Senior Notes are initially convertible at a rate of 11.8818 shares of common stock per $1,000 principal amount converted, which is approximately equal to $84.16 per share of common stock. The conversion rate will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), Southern Company will, in certain circumstances, increase the conversion rate by a number of additional shares of common stock for conversions in connection with the make-whole fundamental change.
Upon the occurrence of a fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), holders of the Series 2023A Convertible Senior Notes may require Southern Company to purchase all or a portion of their Series 2023A Convertible Senior Notes, in principal amounts equal to $1,000 or an integral multiple thereof, for cash at a price equal to 100% of the principal amount of the Series 2023A Convertible Senior Notes to be purchased plus any accrued and unpaid interest.
Bank Credit Arrangements
At December 31, 2023, committed credit arrangements with banks were as follows:
Expires
Company2024202520262028TotalUnused
Expires within
One Year
(in millions)
Southern Company parent(a)
$150 $— $— $1,850 $2,000 $1,998 $150 
Alabama Power— — 650 700 1,350 1,350 — 
Georgia Power— — — 1,750 1,750 1,726 — 
Mississippi Power— 125 150 — 275 275 — 
Southern Power(a)(b)
— — — 600 600 589 — 
Southern Company Gas(c)
100 — — 1,500 1,600 1,598 100 
SEGCO30 — — — 30 30 30 
Southern Company$280 $125 $800 $6,400 $7,605 $7,566 $280 
(a)Arrangement expiring in 2028 represents a $2.45 billion combined arrangement for Southern Company and Southern Power as borrowers. Pursuant to the combined facility, the allocations between Southern Company and Southern Power may be adjusted.
(b)Does not include Southern Power Company's $75 million and $100 million continuing letter of credit facilities for standby letters of credit, expiring in 2025 and 2026, respectively, of which $8 million and $7 million, respectively, was unused at December 31, 2023. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities.
(c)Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $800 million of the credit arrangement expiring in 2028. Southern Company Gas' committed credit arrangement expiring in 2028 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangement expiring in 2028, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower under a $100 million credit arrangement expiring in 2024. See "Structural Considerations" herein for additional information.
The bank credit arrangements require payment of commitment fees based on the unused portion of the commitments. Commitment fees average less than 1/4 of 1% for the Registrants and Nicor Gas. Subject to applicable market conditions, Southern Company and its subsidiaries expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, Southern Company and its subsidiaries may extend the maturity dates and/or increase or decrease the lending commitments thereunder.
These bank credit arrangements, as well as the term loan arrangements of the Registrants, Nicor Gas, and SEGCO, contain covenants that limit debt levels and contain cross-acceleration provisions to other indebtedness (including guarantee obligations) that are restricted only to the indebtedness of the individual company. The cross-acceleration provisions to other indebtedness would trigger an event of default if the applicable borrower defaulted on indebtedness, the payment of which was then
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accelerated. Southern Company's, certain of Mississippi Power's, Southern Company Gas', and Nicor Gas' credit arrangements contain covenants that limit debt levels to 70% of total capitalization, as defined in the agreements, and the other subsidiaries' bank credit arrangements contain covenants that limit debt levels to 65% of total capitalization, as defined in the agreements. For purposes of these definitions, debt excludes junior subordinated notes and, in certain arrangements, other hybrid securities. Additionally, for Southern Company and Southern Power, for purposes of these definitions, debt excludes any project debt incurred by certain subsidiaries of Southern Power to the extent such debt is non-recourse to Southern Power and capitalization excludes the capital stock or other equity attributable to such subsidiaries. At December 31, 2023, the Registrants, Nicor Gas, and SEGCO were in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowings.
A portion of the unused credit with banks is allocated to provide liquidity support to certain revenue bonds of the traditional electric operating companies and the commercial paper programs of the Registrants, Nicor Gas, and SEGCO. At December 31, 2023, outstanding variable rate demand revenue bonds of the traditional electric operating companies with allocated liquidity support totaled approximately $1.7 billion (comprised of approximately $818 million at Alabama Power, $819 million at Georgia Power, and $69 million at Mississippi Power). In addition, at December 31, 2023, Georgia Power had approximately $325 million of fixed rate revenue bonds outstanding that are required to be remarketed within the next 12 months. The variable rate demand revenue bonds and fixed rate revenue bonds required to be remarketed within the next 12 months are classified as long-term debt on the balance sheets as a result of available long-term committed credit.
At both December 31, 2023 and 2022, Southern Power had $106 million of cash collateral posted related to PPA requirements, which is included in other deferred charges and assets on Southern Power's consolidated balance sheets.
Notes Payable
The Registrants, Nicor Gas, and SEGCO make short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above under "Bank Credit Arrangements." Southern Power's subsidiaries are not parties or obligors to its commercial paper program. Southern Company Gas maintains commercial paper programs at Southern Company Gas Capital and at Nicor Gas. Nicor Gas' commercial paper program supports working capital needs at Nicor Gas as Nicor Gas is not permitted to make money pool loans to affiliates. All of Southern Company Gas' other subsidiaries benefit from Southern Company Gas Capital's commercial paper program. See "Structural Considerations" herein for additional information.
In addition, Southern Company and certain of its subsidiaries have entered into various bank term loan agreements. Unless otherwise stated, the proceeds of these loans were used to repay existing indebtedness and for general corporate purposes, including working capital and, for the subsidiaries, their continuous construction programs.
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Commercial paper and short-term bank term loans are included in notes payable in the balance sheets. Details of short-term borrowings for the applicable Registrants were as follows:
Notes Payable at December 31, 2023Notes Payable at December 31, 2022
Amount
Outstanding
Weighted Average
Interest Rate
Amount
Outstanding
Weighted Average
Interest Rate
(in millions)(in millions)
Southern Company
Commercial paper$1,794 5.6 %$809 4.7 %
Short-term bank debt520 6.4 %1,800 5.0 %
Total$2,314 5.7 %$2,609 4.9 %
Alabama Power
Commercial paper$40 5.5 %$— — %
Georgia Power
Commercial paper$809 5.6 %$— — %
Short-term bank debt520 6.4 %1,600 5.0 %
Total$1,329 5.9 %$1,600 5.0 %
Southern Power
Commercial paper$138 5.5 %$225 4.7 %
Southern Company Gas
Commercial paper:
Southern Company Gas Capital$23 5.5 %$285 4.8 %
Nicor Gas392 5.5 %283 4.6 %
Short-term bank debt:
Nicor Gas  %200 4.9 %
Total$415 5.5 %$768 4.7 %
See "Bank Credit Arrangements" herein for information on bank term loan covenants that limit debt levels and cross-acceleration or cross-default provisions.
Outstanding Classes of Capital Stock
Southern Company
Common Stock
Stock Issued
During 2023, Southern Company issued approximately 2.1 million shares of common stock primarily through equity compensation plans and received proceeds of approximately $36 million.
Shares Reserved
At December 31, 2023, a total of 131 million shares were reserved for issuance pursuant to the Southern Investment Plan, employee savings plans, the Equity and Incentive Compensation Plan (which includes stock options and performance share units as discussed in Note 12), an at-the-market program, and the Series 2023A Convertible Senior Notes (as discussed under "Convertible Senior Notes" herein). Of the shares reserved, 26.9 million shares are available for awards under the Equity and Incentive Compensation Plan at December 31, 2023.
Diluted Earnings Per Share
For Southern Company, the only difference in computing basic and diluted earnings per share (EPS) is attributable to awards outstanding under stock-based compensation plans and the Series 2023A Convertible Senior Notes. EPS dilution resulting from
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stock-based compensation plans is determined using the treasury stock method and EPS dilution resulting from the Series 2023A Convertible Senior Notes is determined using the net share settlement method. See Note 12 and "Convertible Senior Notes" herein for additional information. Shares used to compute diluted EPS were as follows:
 Average Common Stock Shares
 202320222021
 (in millions)
As reported shares1,092 1,075 1,061 
Effect of stock-based compensation6 
Diluted shares1,098 1,081 1,068 
For 2023, there were no anti-dilutive shares. For 2022 and 2021, an immaterial number of stock-based compensation awards was excluded from the diluted EPS calculation because the awards were anti-dilutive.
For all periods presented, there was no dilution resulting from the Series 2023A Convertible Senior Notes.
Preferred Stock of Subsidiaries
As discussed further under "Alabama Power" herein, during 2022, Alabama Power redeemed all of its preferred stock and Class A preferred stock.
Alabama Power
Alabama Power has preferred stock, Class A preferred stock, preference stock, and common stock authorized, but only common stock outstanding at December 31, 2023.
During 2022, Alabama Power redeemed all of its preferred stock and Class A preferred stock at the redemption prices per share provided in the table below, plus accrued and unpaid dividends to the redemption date.
Preferred Stock Redeemed During 2022Par Value/Stated Capital Per ShareSharesRedemption
Price Per Share
4.92% Preferred Stock$10080,000 $103.23
4.72% Preferred Stock$10050,000 $102.18
4.64% Preferred Stock$10060,000 $103.14
4.60% Preferred Stock$100100,000 $104.20
4.52% Preferred Stock$10050,000 $102.93
4.20% Preferred Stock$100135,115 $105.00
5.00% Class A Preferred Stock$2510,000,000 $25.00
Georgia Power
Georgia Power has preferred stock, Class A preferred stock, preference stock, and common stock authorized, but only common stock outstanding.
Mississippi Power
Mississippi Power has preferred stock and common stock authorized, but only common stock outstanding.
Dividend Restrictions
The income of Southern Company is derived primarily from equity in earnings of its subsidiaries. At December 31, 2023, consolidated retained earnings included $5.5 billion of undistributed retained earnings of the subsidiaries.
The traditional electric operating companies and Southern Power can only pay dividends to Southern Company out of retained earnings or paid-in-capital.
See Note 7 under "Southern Power" for information regarding the distribution requirements for certain Southern Power subsidiaries.
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By regulation, Nicor Gas is restricted, up to its retained earnings balance, in the amount it can dividend or loan to affiliates and is not permitted to make money pool loans to affiliates. At December 31, 2023, the amount of Southern Company Gas' subsidiary retained earnings available for dividend payment totaled $1.7 billion.
Structural Considerations
Since Southern Company and Southern Company Gas are holding companies, the right of Southern Company and Southern Company Gas and, hence, the right of creditors of Southern Company or Southern Company Gas to participate in any distribution of the assets of any respective subsidiary of Southern Company or Southern Company Gas, whether upon liquidation, reorganization or otherwise, is subject to prior claims of creditors and preferred stockholders of such subsidiary.
Southern Company Gas' 100%-owned subsidiary, Southern Company Gas Capital, was established to provide for certain of Southern Company Gas' ongoing financing needs through a commercial paper program, the issuance of various debt, hybrid securities, and other financing arrangements. Southern Company Gas fully and unconditionally guarantees all debt issued by Southern Company Gas Capital. Nicor Gas is not permitted by regulation to make loans to affiliates or utilize Southern Company Gas Capital for its financing needs.
Southern Power Company's senior notes, bank term loan, commercial paper, and bank credit arrangementare unsecured senior indebtedness, which rank equally with all other unsecured and unsubordinated debt of Southern Power Company. Southern Power's subsidiaries are not issuers, borrowers, or obligors, as applicable, under any of these unsecured senior debt arrangements, which are effectively subordinated to any future secured debt of Southern Power Company and any potential claims of creditors of Southern Power's subsidiaries.
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9. LEASES
Lessee
The Registrants recognize leases with a term of greater than 12 months on the balance sheet as lease obligations, representing the discounted future fixed payments due, along with ROU assets that will be amortized over the term of each lease.
As lessee, the Registrants lease certain electric generating units (including renewable energy facilities), real estate/land, communication towers, railcars, and other equipment and vehicles. The major categories of lease obligations are as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
 (in millions)
At December 31, 2023
Electric generating units(*)
$670 $58 $1,028 $— $— $— 
Real estate/land871 54 546 28 
Communication towers123 — — 23 
Railcars64 32 27 — — 
Other60 18 — — 
Total$1,788 $98 $1,115 $25 $546 $51 
At December 31, 2022
Electric generating units(*)
$760 $59 $1,163 $— $— $— 
Real estate/land885 54 542 36 
Communication towers141 — — 23 
Railcars34 12 18 — — 
Other79 21 — 
Total$1,899 $81 $1,240 $26 $542 $60 
(*)Amounts related to affiliate leases are eliminated in consolidation for Southern Company. See "Contracts that Contain a Lease" herein for additional information.
Real estate/land leases primarily consist of commercial real estate leases at Southern Company, Georgia Power, and Southern Company Gas and various land leases primarily associated with renewable energy facilities at Southern Power. The commercial real estate leases have remaining terms of up to 27 years while the land leases have remaining terms of up to 44 years, including renewal periods.
Communication towers are leased for the installation of equipment to provide cellular phone service to customers and to support the automated meter infrastructure programs at the traditional electric operating companies and Nicor Gas. Communication tower leases have remaining terms of up to 17 years.
Renewal options exist in many of the leases. The expected term used in calculating the lease obligation generally reflects only the noncancelable period of the lease unless it is considered reasonably certain that the lease will be extended. Land leases associated with renewable energy facilities at Southern Power and communication tower leases for automated meter infrastructure at Nicor Gas include renewal periods reasonably certain of exercise resulting in an expected lease term at least equal to the expected life of the renewable energy facilities and the automated meter infrastructure, respectively.
Contracts that Contain a Lease
While not specifically structured as a lease, some of the PPAs at Alabama Power and Georgia Power are deemed to represent a lease of the underlying electric generating units when the terms of the PPA convey the right to control the use of the underlying assets. Amounts recorded for leases of electric generating units are generally based on the amount of scheduled capacity payments due over the remaining term of the PPA, which varies between one and 16 years. Georgia Power has several PPAs with Southern Power that Georgia Power accounts for as leases with a lease obligation of $416 million and $461 million at December 31, 2023 and 2022, respectively. The amount paid for energy under these affiliate PPAs reflects a price that would be paid in an arm's-length transaction as reviewed and approved by the Georgia PSC. Amounts related to the affiliate PPAs are eliminated in consolidation for Southern Company.
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Short-term Leases
Leases with an initial term of 12 months or less are not recorded on the balance sheet; the Registrants generally recognize lease expense for these leases on a straight-line basis over the lease term.
Residual Value Guarantees
Residual value guarantees exist primarily in railcar leases at Alabama Power and Georgia Power and the amounts probable of being paid under those guarantees are included in the lease payments. All such amounts are immaterial at December 31, 2023 and 2022.
Lease and Nonlease Components
For all asset categories, with the exception of electric generating units, gas pipelines, and real estate leases, the Registrants combine lease payments and any nonlease components, such as asset maintenance, for purposes of calculating the lease obligation and the right-of-use asset.
Balance sheet amounts recorded for operating and finance leases are as follows:
Southern CompanyAlabama
Power
Georgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
 (in millions)
At December 31, 2023
Operating Leases
Operating lease ROU assets, net$1,432 $87 $884 $$488 $47 
Operating lease obligations - current$183 $12 $135 $$29 $11 
Operating lease obligations - non-current1,307 81 740 517 40 
Total operating lease obligations(*)
$1,490 $93 $875 $$546 $51 
Finance Leases
Finance lease ROU assets, net$272 $$203 $15 $— $— 
Finance lease obligations - current$11 $$18 $$— $— 
Finance lease obligations - non-current287 222 15 — — 
Total finance lease obligations$298 $$240 $16 $— $— 
At December 31, 2022
Operating Leases
Operating lease ROU assets, net$1,531 $71 $1,007 $$489 $57 
Operating lease obligations - current$197 $$151 $$28 $
Operating lease obligations - non-current1,388 67 851 514 51 
Total operating lease obligations(*)
$1,585 $76 $1,002 $$542 $60 
Finance Leases
Finance lease ROU assets, net$292 $$205 $16 $— $— 
Finance lease obligations - current$18 $$16 $$— $— 
Finance lease obligations - non-current296 222 16 — — 
Total finance lease obligations$314 $$238 $17 $— $— 
(*)Includes operating lease obligations related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $566 million, $58 million, and $813 million, respectively, at December 31, 2023 and $652 million, $59 million, and $952 million, respectively, at December 31, 2022.
If not presented separately on the Registrants' balance sheets, amounts related to leases are presented as follows: operating lease ROU assets, net are included in "other deferred charges and assets"; operating lease obligations are included in "other current liabilities" and "other deferred credits and liabilities," as applicable; finance lease ROU assets, net are included in "plant in service"; and finance lease obligations are included in "securities due within one year" and "long-term debt," as applicable.
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Lease costs for 2023, 2022, and 2021, which includes both amounts recognized as operations and maintenance expense and amounts capitalized as part of the cost of another asset, are as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
 (in millions)
2023
Lease cost
Operating lease cost(*)
$252 $16 $192 $$34 $12 
Finance lease cost:
Amortization of ROU assets24 19 — — 
Interest on lease obligations14 — 17 — — — 
Total finance lease cost38 36 — — 
Short-term lease costs40 16 16 — — — 
Variable lease cost47 — 74 — — 
Sublease income— — — — — — 
Total lease cost$377 $34 $318 $$38 $12 
2022
Lease cost
Operating lease cost(*)
$297 $59 $198 $$32 $15 
Finance lease cost:
Amortization of ROU assets23 15 — — 
Interest on lease obligations13 — 17 — — 
Total finance lease cost36 32 — — 
Short-term lease costs64 44 13 — — — 
Variable lease cost125 13 105 — — 
Sublease income(1)— — — — — 
Total lease cost$521 $117 $348 $$37 $15 
2021
Lease cost
Operating lease cost(*)
$313 $58 $208 $$33 $19 
Finance lease cost:
Amortization of ROU assets21 11 — — 
Interest on lease obligations11 — 16 — — 
Total finance lease cost32 27 — — 
Short-term lease costs48 15 24 — — — 
Variable lease cost96 83 — — 
Sublease income— — — — — 
Total lease cost$490 $78 $342 $$38 $19 
(*)Includes operating lease costs related to PPAs at Southern Company, Alabama Power, and Georgia Power totaling $112 million, $4 million, and $174 million, respectively, in 2023, $162 million, $48 million, and $180 million, respectively, in 2022, and $165 million, $47 million, and $184 million, respectively, in 2021.
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Georgia Power has variable lease payments that are based on the amount of energy produced by certain renewable generating facilities subject to PPAs, including $42 million, $45 million, and $41 million in 2023, 2022, and 2021, respectively, from finance leases which are included in purchased power on Georgia Power's statements of income, of which $21 million, $21 million, and $20 million was included in purchased power, affiliates in 2023, 2022, and 2021, respectively.
Other information with respect to cash and noncash activities related to leases, as well as weighted-average lease terms and discount rates, is as follows:
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
 (in millions)
2023
Other information
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases$253 $17 $199 $$33 $12 
Operating cash flows from finance leases15 — 22 — — — 
Financing cash flows from finance leases18 16 — — 
ROU assets obtained under operating leases100 30 26 
ROU assets obtained under finance leases18 — — — 
2022
Other information
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases$303 $58 $206 $$30 $14 
Operating cash flows from finance leases11 — 20 — — 
Financing cash flows from finance leases16 10 — — 
ROU assets obtained under operating leases56 10 17 — 
Reassessment of ROU assets under operating leases16 — — — 16 — 
ROU assets obtained under finance leases118 116 — — — 
2021
Other information
Cash paid for amounts included in the measurements of lease obligations:
Operating cash flows from operating leases$308 $58 $211 $$28 $19 
Operating cash flows from finance leases— 17 — — 
Financing cash flows from finance leases17 — — 
ROU assets obtained under operating leases64 — 72 
ROU assets obtained under finance leases— — — — — 
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COMBINED NOTES TO FINANCIAL STATEMENTS

Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
At December 31, 2023
Weighted-average remaining lease term in years:
Operating leases17.211.17.54.633.17.0
Finance leases16.74.310.611.9N/AN/A
Weighted-average discount rate:
Operating leases4.68 %5.02 %4.58 %3.67 %4.89 %3.80 %
Finance leases4.85 %3.93 %5.95 %2.74 %N/AN/A
At December 31, 2022
Weighted-average remaining lease term in years:
Operating leases17.313.08.14.734.011.0
Finance leases17.46.411.812.9N/AN/A
Weighted-average discount rate:
Operating leases4.51 %4.87 %4.52 %3.49 %4.86 %3.79 %
Finance leases4.87 %3.00 %8.06 %2.74 %N/AN/A
Maturities of lease liabilities are as follows:
At December 31, 2023
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
 (in millions)
Maturity Analysis
Operating leases:
2024$230 $16 $172 $$36 $12 
2025203 14 147 29 12 
2026180 12 142 29 
2027159 10 141 — 29 
2028143 135 — 30 
Thereafter1,378 64 303 1,000 18 
Total2,293 123 1,040 10 1,153 58 
Less: Present value discount803 30 165 607 
Operating lease obligations$1,490 $93 $875 $$546 $51 
Finance leases:
2024$22 $$27 $$— $— 
202527 36 — — 
202627 36 — — 
202727 36 — — 
202826 37 — — 
Thereafter320 — 153 10 — — 
Total449 325 19 — — 
Less: Present value discount151 85 — — 
Finance lease obligations$298 $$240 $16 $— $— 
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COMBINED NOTES TO FINANCIAL STATEMENTS

Payments made under PPAs at Georgia Power for energy generated from certain renewable energy facilities accounted for as operating and finance leases are considered variable lease costs and are therefore not reflected in the above maturity analysis.
Lessor
The Registrants are each considered lessors in various arrangements that have been determined to contain a lease due to the customer's ability to control the use of the underlying asset owned by the applicable Registrant. For the traditional electric operating companies, these arrangements consist of outdoor lighting contracts accounted for as operating leases with initial terms of up to 10 years, after which the contracts renew on a month-to-month basis at the customer's option. For Mississippi Power, these arrangements also include a tolling arrangement related to an electric generating unit accounted for as a sales-type lease with a remaining term of 15 years. For Southern Power, these arrangements consist of PPAs related to electric generating units accounted for as operating leases with remaining terms of up to 23 years and PPAs related to battery energy storage facilities accounted for as sales-type leases with remaining terms of up to 18 years. Southern Company Gas is the lessor in operating leases related to gas pipelines with remaining terms of up to 19 years. For Southern Company, these arrangements also include PPAs related to fuel cells accounted for as operating leases with remaining terms of up to 10 years.
Lease income for 2023, 2022, and 2021, is as follows:
Southern
Company
Alabama PowerGeorgia PowerMississippi
Power
Southern PowerSouthern Company Gas
 (in millions)
2023
Lease income - interest income on sales-type leases$24 $— $— $14 $10 $— 
Lease income - operating leases164 35 29 85 37 
Variable lease income406 — — 437 — 
Total lease income$594 $36 $29 $16 $532 $37 
2022
Lease income - interest income on sales-type leases$25 $— $— $15 $10 $— 
Lease income - operating leases208 77 32 85 36 
Variable lease income417 — — 448 — 
Total lease income$650 $78 $32 $17 $543 $36 
2021
Lease income - interest income on sales-type leases$15 $— $— $14 $$— 
Lease income - operating leases223 82 42 85 35 
Variable lease income429 — — — 456 — 
Total lease income$667 $82 $42 $16 $542 $35 
Lease payments received under tolling arrangements and PPAs consist of either scheduled payments or variable payments based on the amount of energy produced by the underlying electric generating units. Lease income related to PPAs for Alabama Power and Southern Power is included in wholesale revenues. Scheduled payments to be received under outdoor lighting contracts, tolling arrangements, and PPAs accounted for as leases are presented in the following maturity analyses.
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Mississippi Power has a tolling arrangement accounted for as a sales-type lease. During 2021, Mississippi Power completed construction of additional leased assets under the lease and, upon completion, the book value of $39 million was transferred from CWIP to lease receivables. The transfer represented a non-cash investing transaction for purposes of the statements of cash flows.
During 2021, Southern Power completed construction of a portion of the Garland and Tranquillity battery energy storage facilities' assets and recorded losses totaling $40 million upon commencement of the related PPAs, which Southern Power accounts for as sales-type leases. The losses were due to ITCs retained and expected to be realized by Southern Power and its partners in these projects, and no estimated residual asset value was assumed in calculating the losses. Each lease had an initial term of 20 years. Upon commencement of the leases, the book values of the related assets totaling $210 million were derecognized from CWIP and lease receivables were recorded. The transfers represented noncash investing transactions for purposes of the statement of cash flows. See Note 15 under "Southern Power" for additional information.
The undiscounted cash flows expected to be received for in-service leased assets under the leases are as follows:
At December 31, 2023
Southern CompanyMississippi PowerSouthern
Power
 (in millions)
2024$38 $23 $15 
202537 22 15 
202636 21 15 
202735 20 15 
202834 19 15 
Thereafter330 145 185 
Total undiscounted cash flows$510 $250 $260 
Net investment in sales-type lease(*)
311 148 163 
Difference between undiscounted cash flows and discounted cash flows$199 $102 $97 
(*)For Mississippi Power, included in other current assets and other property and investments on the balance sheets. For Southern Power, included in other current assets ($15 million and $15 million at December 31, 2023 and 2022, respectively) and net investment in sales-type leases ($148 million and $154 million at December 31, 2023 and 2022, respectively) on the balance sheet.
The undiscounted cash flows to be received under operating leases and contracts accounted for as operating leases are as follows:
At December 31, 2023
Southern
Company
Alabama
Power
Southern
Power
Southern Company Gas
 (in millions)
2024$116 $$90 $35 
2025107 75 29 
2026108 73 29 
2027105 75 28 
2028104 76 28 
Thereafter706 26 91 354 
Total$1,246 $50 $480 $503 
Southern Power receives payments for renewable energy under PPAs accounted for as operating leases that are considered contingent rents and are therefore not reflected in the table above. Alabama Power and Southern Power allocate revenue to the nonlease components of PPAs based on the stand-alone selling price of capacity and energy. The undiscounted cash flows to be received under outdoor lighting contracts accounted for as operating leases at Georgia Power and Mississippi Power are immaterial.
Southern Company Leveraged Lease
At December 31, 2020, a subsidiary of Southern Holdings had four leveraged lease agreements related to energy generation, distribution, and transportation assets, including two domestic and two international projects. During 2021, one of the domestic
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projects was sold and the agreements for both international projects were terminated. At December 31, 2023, the one remaining leveraged lease agreement, which relates to energy generation, had an expected remaining term of eight years. Southern Company continues to receive federal income tax deductions for depreciation and amortization, as well as interest on long-term debt related to this investment. Southern Company wrote off the related investment balance in 2020 following an evaluation of the recoverability of the lease receivable and the expected residual value of the generation assets at the end of the lease.
The following table provides a summary of the components of income related to leveraged lease investments. Income was impacted in 2021 by the impairment charges discussed below and in Note 15 under "Southern Company." Income in 2021 does not include the impacts of the sale and terminations of leveraged lease projects discussed in Note 15 under "Southern Company."
2021
(in millions)
Pretax leveraged lease income$17 
Income tax expense(5)
Net leveraged lease income$12 
In June 2022, the Southern Holdings subsidiary operating the generating plant for the lessee provided notice to the lessee to terminate the related operating and maintenance agreement effective June 30, 2023. Subsequently, the lessee failed to make the semi-annual lease payment due in December 2022. As a result, the Southern Holdings subsidiary was unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. The parties to the lease entered into forbearance agreements which suspended the related contractual rights of the parties while they continued restructuring negotiations, during which the termination date for the operating and maintenance agreement was delayed until July 31, 2023. The negotiations were completed on July 14, 2023, resulting in the Southern Holdings subsidiary agreeing to continue operating the plant for the lessee until the lessee's associated power off-take agreement ends in 2032, subject to certain terms and conditions. The restructuring had no material impact on Southern Company's financial statements. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to meet its obligations, including those associated with a future closure or retirement of the generation assets and associated properties, including the dry ash landfill.
10. INCOME TAXES
Southern Company files a consolidated federal income tax return and the Registrants file various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis, and each subsidiary is allocated an amount of tax similar to that which would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.
Current and Deferred Income Taxes
Details of income tax provisions are as follows:
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Federal —
Current$54 $242 $205 $49 $(320)$62 
Deferred299 (257)195 (26)334 68 
Total federal353 (15)400 23 14 130 
State —
Current41 82 37 1 (1)24 
Deferred102 14 11 12 (1)57 
Total state143 96 48 13 (2)81 
Total$496 $81 $448 $36 $12 $211 
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COMBINED NOTES TO FINANCIAL STATEMENTS

2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Federal —
Current$10 $54 $38 $42 $(43)$122 
Deferred455 259 152 (16)56 (3)
Total federal465 313 190 26 13 119 
State —
Current27 14 (21)— 42 
Deferred303 96 201 11 19 
Total state330 110 180 11 61 
Total$795 $423 $370 $37 $20 $180 
2021
Southern CompanyAlabama PowerGeorgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
(in millions)
Federal —
Current$50 $104 $311 $25 $(340)$85 
Deferred36 172 (449)(15)343 35 
Total federal86 276 (138)10 120 
State —
Current(25)23 71 — (16)(68)
Deferred206 73 (101)11 — 223 
Total state181 96 (30)11 (16)155 
Total$267 $372 $(168)$21 $(13)$275 
Southern Company's and Southern Power's ITCs and PTCs generated in the current tax year and carried forward from prior tax years that cannot be utilized in the current tax year are reclassified from current to deferred taxes in federal income tax expense in the tables above. Southern Power's ITCs and PTCs reclassified in this manner include $5 million for 2023, $17 million for 2022, and $6 million for 2021. Southern Power received $332 million, $49 million, and $289 million of cash related to federal ITCs under renewable energy initiatives in 2023, 2022, and 2021, respectively. See "Deferred Tax Assets and Liabilities" herein for additional information.
In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies are amortized over the average life of the related property, with such amortization normally applied as a credit to reduce depreciation and amortization in the statements of income. Southern Power's and the natural gas distribution utilities' deferred federal ITCs, as well as certain state ITCs for Nicor Gas, are amortized to income tax expense over the life of the respective asset. ITCs amortized in 2023, 2022, and 2021 were immaterial for the traditional electric operating companies and Southern Company Gas and were as follows for Southern Company and Southern Power:
Southern CompanySouthern Power
(in millions)
2023$84 $58 
202283 58 
202184 58 
When Southern Power recognizes tax credits, the tax basis of the asset is reduced by 50% of the ITCs received, resulting in a net deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation.
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COMBINED NOTES TO FINANCIAL STATEMENTS

State ITCs and other state credits, which are recognized in the period in which the credits are generated, reduced Georgia Power's income tax expense by $49 million in 2023, $53 million in 2022, and $66 million in 2021.
Southern Power's federal and state PTCs, which are recognized in the period in which the credits are generated, reduced Southern Power's income tax expense by $26 million in 2023, $27 million in 2022, and $16 million in 2021.
During the fourth quarter 2023, Southern Power executed an agreement to transfer certain PTCs generated in 2023 and received cash of $12 million. The discount recognized was booked through income tax expense and was immaterial.
Pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power paid $39 million to the other Vogtle Owners for advanced nuclear PTCs for Plant Vogtle Unit 3. The gain recognized in 2023 was booked through income tax benefit and was immaterial.
Effective Tax Rate
Southern Company's effective tax rate is typically lower than the statutory rate due to employee stock plans' dividend deduction, non-taxable AFUDC equity at the traditional electric operating companies, flowback of excess deferred income taxes at the regulated utilities, and federal income tax benefits from ITCs and PTCs primarily at Southern Power.
In July 2021, Southern Company Gas affiliates completed the sale of Sequent. As a result of the sale, changes in state apportionment rates resulted in $85 million of additional net state tax expense. See Note 15 under "Southern Company Gas" for additional information.
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction2.6 5.2 1.5 4.9 (0.7)7.8 
Employee stock plans' dividend deduction(0.5)     
Non-deductible book depreciation0.7 0.7 0.8 0.4   
Flowback of excess deferred income taxes(9.2)(19.8)(2.6)(10.2) (2.6)
AFUDC-Equity(1.1)(1.2)(1.2)   
Federal PTCs(1.2) (1.4) (7.4) 
ITC amortization(1.3)(0.1)(0.1) (19.0) 
Noncontrolling interests0.6    11.1  
Other(0.2)(0.2)(0.3)0.1 0.1 (0.6)
Effective income tax (benefit) rate11.4 %5.6 %17.7 %16.2 %5.1 %25.6 %
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COMBINED NOTES TO FINANCIAL STATEMENTS

2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction6.2 4.8 6.5 4.4 1.9 6.4 
Employee stock plans' dividend deduction(0.5)— — — — — 
Non-deductible book depreciation0.6 0.5 0.6 0.3 — — 
Flowback of excess deferred income taxes(6.6)(1.9)(9.6)(7.8)— (2.5)
AFUDC-Equity(1.1)(0.8)(1.5)— — — 
Federal PTCs— — — — (6.6)— 
ITC amortization(1.3)(0.1)(0.1)— (17.2)(0.1)
Noncontrolling interests0.5 — — — 8.4 — 
Other— 0.3 — 0.3 (0.1)(0.9)
Effective income tax (benefit) rate18.8 %23.8 %16.9 %18.2 %7.4 %23.9 %
2021
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction5.5 4.6 (5.7)4.9 (8.0)15.1 
Employee stock plans' dividend deduction(0.9)— — — — — 
Non-deductible book depreciation0.9 0.5 3.1 0.4 — — 
Flowback of excess deferred income taxes(11.7)(2.6)(49.9)(15.2)— (2.8)
AFUDC-Equity(1.5)(0.7)(6.4)— — — 
Federal PTCs— — — — (4.6)— 
ITC amortization(2.2)(0.1)(0.4)— (29.7)(0.1)
Noncontrolling interests0.8 — — — 13.4 — 
Leveraged lease impairments and dispositions(1.4)— — — — — 
Other(0.1)0.2 (1.9)0.6 (0.4)0.6 
Effective income tax (benefit) rate10.4 %22.9 %(40.2)%11.7 %(8.3)%33.8 %
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COMBINED NOTES TO FINANCIAL STATEMENTS

Deferred Tax Assets and Liabilities
The tax effects of temporary differences between the carrying amounts of assets and liabilities in the financial statements of the Registrants and their respective tax bases, which give rise to deferred tax assets and liabilities, are as follows:
December 31, 2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred tax liabilities —
Accelerated depreciation$9,683 $2,566 $3,628 $339 $1,346 $1,576 
Property basis differences2,647 1,444 812 188 — 189 
Employee benefit obligations979 321 446 49 12 74 
AROs833 476 314 — — — 
Under recovered fuel and natural gas costs601 80 508 13 — — 
Regulatory assets –
AROs1,902 667 1,196 39 — — 
Employee benefit obligations797 213 260 37 — 11 
Remaining book value of retired assets369 143 221 — — 
Premium on reacquired debt63 53 — — 
Other700 182 223 43 191 
Total deferred income tax liabilities18,574 6,101 7,661 714 1,360 2,041 
Deferred tax assets —
AROs2,735 1,143 1,510 39 — — 
ITC and PTC carryforwards1,387 12 691 — 481 — 
Employee benefit obligations985 224 316 52 10 89 
Estimated loss on plants under construction857 — 857 — — — 
Estimated loss on regulatory disallowance26 — — — — 26 
Other state deferred tax attributes363 — 13 231 49 
Federal effect of net state deferred tax liabilities418 215 92 — 27 101 
Other property basis differences197 — 83 — 97 — 
State effect of federal deferred taxes115 115 — — — — 
Other partnership basis differences85 — — — 85 — 
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)34 30 — — — 
Long-term debt fair value adjustment79 — — — — 79 
Other comprehensive losses67 — — 
Other538 188 152 57 18 74 
Total deferred income tax assets7,886 1,931 3,718 382 773 377 
Valuation allowance(206)— (75)(41)(27)(7)
Net deferred income tax assets7,680 1,931 3,643 341 746 370 
Net deferred income taxes (assets)/liabilities$10,894 $4,170 $4,018 $373 $614 $1,671 
Recognized in the balance sheets:
Accumulated deferred income taxes – assets$(96)$ $ $(96)$ $ 
Accumulated deferred income taxes – liabilities$10,990 $4,170 $4,018 $469 $614 $1,671 
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COMBINED NOTES TO FINANCIAL STATEMENTS

December 31, 2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred tax liabilities —
Accelerated depreciation$9,443 $2,564 $3,447 $338 $1,351 $1,505 
Property basis differences2,350 1,303 693 179 — 150 
Employee benefit obligations888 284 412 43 11 68 
AROs876 499 324 — — — 
Under recovered fuel and natural gas costs805 185 548 40 — 32 
Regulatory assets –
AROs2,006 679 1,285 42 — — 
Employee benefit obligations677 180 226 30 — 15 
Remaining book value of retired assets400 142 253 — — 
Premium on reacquired debt66 57 — — — 
Other555 179 181 40 14 82 
Total deferred income tax liabilities18,066 6,024 7,426 717 1,376 1,852 
Deferred tax assets —
AROs2,882 1,178 1,609 42 — — 
ITC and PTC carryforwards1,685 12 673 — 794 — 
Employee benefit obligations890 198 304 47 89 
Estimated loss on plants under construction888 — 888 — — — 
Other state deferred tax attributes388 — 12 239 51 
Federal effect of net state deferred tax liabilities365 175 88 — 28 92 
Other property basis differences207 — 79 — 109 — 
State effect of federal deferred taxes136 136 — — — — 
Other partnership basis differences111 — — — 111 — 
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)137 127 — — — 
Long-term debt fair value adjustment85 — — — — 85 
Other comprehensive losses72 — — 
Other552 213 186 62 17 28 
Total deferred income tax assets8,398 2,043 3,844 399 1,124 301 
Valuation allowance(257)— (125)(41)(27)(9)
Net deferred income tax assets8,141 2,043 3,719 358 1,097 292 
Net deferred income taxes (assets)/liabilities$9,925 $3,981 $3,707 $359 $279 $1,560 
Recognized in the balance sheets:
Accumulated deferred income taxes – assets$(111)$ $ $(107)$ $ 
Accumulated deferred income taxes – liabilities$10,036 $3,981 $3,707 $466 $279 $1,560 
The traditional electric operating companies and the natural gas distribution utilities have tax-related regulatory assets (deferred income tax charges) and regulatory liabilities (deferred income tax credits). The regulatory assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest. The regulatory liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and to unamortized ITCs. See Note 2 for each Registrant's related balances at December 31, 2023 and 2022.
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COMBINED NOTES TO FINANCIAL STATEMENTS

Tax Credit Carryforwards
Federal ITC/PTC carryforwards at December 31, 2023 were as follows:
Southern CompanyAlabama
Power
Georgia
Power
Southern
Power
(in millions)
Federal ITC/PTC carryforwards$829 $12 $131 $481 
Tax year in which federal ITC/PTC carryforwards begin expiring2031203220312035
Year by which federal ITC/PTC carryforwards are expected to be utilized2029202820282029
The estimated tax credit utilization reflects the various transactions described in Note 15 and could be impacted by numerous factors, including the acquisition of additional renewable projects, changes in taxable income projections, transfer of eligible credits, potential income tax rate changes, and the ultimate implementation of the natural gas safe harbor method for repairs. In the third quarter 2023, Georgia Power started generating advanced nuclear PTCs for Plant Vogtle Unit 3 beginning on the in-service date of July 31, 2023. In addition, pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 from the other Vogtle Owners. See Note 2 under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
At December 31, 2023, Georgia Power also had approximately $452 million in net state investment and other net state tax credit carryforwards for the State of Georgia that will expire between tax years 2023 and 2032 and are not expected to be fully utilized. Georgia Power has a net state valuation allowance of $60 million associated with these carryforwards.
The ultimate outcome of these matters cannot be determined at this time.
Net Operating Loss Carryforwards
At December 31, 2023, the net state income tax benefit of state and local NOL carryforwards for Southern Company's subsidiaries were as follows:
Company/JurisdictionApproximate Net State Income Tax Benefit of NOL CarryforwardsTax Year NOL
Begins Expiring
(in millions)
Mississippi Power
Mississippi$183 2032
Southern Power
Oklahoma26 2035
Florida10 2034
Other statesVarious
Southern Power Total$38 
Other(*)
New York11 2036
New York City14 2036
Other states30 Various
Southern Company Total$276 
(*)Represents other non-registrant Southern Company subsidiaries. Alabama Power, Georgia Power, and Southern Company Gas did not have material state or local NOL carryforwards at December 31, 2023.
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State NOLs for Mississippi, Oklahoma, and Florida are not expected to be fully utilized prior to expiration. At December 31, 2023, Mississippi Power had a net state valuation allowance of $32 million for the Mississippi NOL, Southern Power had net state valuation allowances of $11 million for the Oklahoma NOL and $10 million for the Florida NOL, and Southern Company had a net valuation allowance of $25 million for the New York and New York City NOLs.
The ultimate outcome of these matters cannot be determined at this time.
Unrecognized Tax Benefits
Changes in unrecognized tax benefits for the periods presented were as follows:
Southern
Company
Georgia
Power
Southern
Company Gas
(in millions)
Unrecognized tax benefits at December 31, 2020$44 $— $— 
Tax positions changes –
Increase from prior periods— — 
Unrecognized tax benefits at December 31, 202147 — — 
Tax positions changes –
Increase from prior periods33 — 32 
Unrecognized tax benefits at December 31, 202280 — 32 
Tax positions changes –
Increase from prior periods88 86 
Statute of limitations expiration(52)(9)— 
Unrecognized tax benefits at December 31, 2023$116 $77 $34 
The unrecognized tax positions increase from prior periods for 2022 is primarily related to the amendment of certain 2018 state tax filing positions related to Southern Company Gas dispositions. If accepted by the states, these positions would decrease Southern Company's and Southern Company Gas' annual effective tax rates. The ultimate outcome of these unrecognized tax benefits is dependent on acceptance by each state and is not expected to be resolved within the next 12 months.
The unrecognized tax positions increase from prior periods for 2023 are primarily related to the amendment of certain 2019 through 2021 state tax filing positions related to tax credit utilization, a portion of which decreased in the fourth quarter 2023 due to a statute of limitations expiration. If effective settlement of the positions is favorable, these positions would decrease Southern Company's and Georgia Power's annual effective tax rates. The ultimate outcome of this unrecognized tax benefit, of which a portion is expected to be resolved within the next 12 months, is dependent on acceptance by the state or expiration of related statute of limitations.
The unrecognized tax positions reductions due to statute of limitations expiration for 2023 primarily relates to a 2019 state tax filing position to exclude certain gains from 2019 dispositions from taxation in a certain unitary state. This tax position and related interest was recognized in the fourth quarter 2023 and decreased Southern Company's annual effective tax rate.
All of the Registrants classify interest on tax uncertainties as interest expense. Accrued interest for all tax positions was immaterial for all years presented. None of the Registrants accrued any penalties on uncertain tax positions.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2022. Southern Company is a participant in the Compliance Assurance Process of the IRS. The IRS has selected six Southern Power partnership returns for exam for the 2020 and 2021 tax years. The ultimate outcome of this matter cannot be determined at this time. The audits for the Registrants' state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2015.
11. RETIREMENT BENEFITS
Effective in December 2017, 538 employees transferred from SCS to the Company. Accordingly, theThe Southern Company assumed various compensation and benefit plans includingsystem has a qualified defined benefit, trusteed pension plan covering substantially all employees, with the exception of PowerSecure employees. The qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). With the transfer of employees, the Company assumed the related benefit obligations from SCS of $139 million forNo contributions to the qualified pension plan (along with trust assets of $138 million)were made for the year ended December 31, 2023 and $11 millionno mandatory contributions to the qualified pension plan are anticipated for other postretirement benefit plans, together with $36 million in prior service costs and net gains/losses that are in OCI. In 2018, the year ending December 31, 2024. The Southern Company willsystem also begin providingprovides certain non-qualified defined benefits under a non-qualified pension plan for a select group of management and highly compensated employees. No obligation related to these benefits was assumed in the employee transfer; however, obligations under the non-qualified pension plan for future services rendered by employees, will be recognized beginning in 2018 and ultimatelywhich are funded on a cash basis. In addition, the Southern Company system provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans that are to be funded on a cash basis.
Priorplans. The traditional electric operating companies fund other postretirement trusts to the transfer of employees in December 2017, substantially all expenses chargedextent required by SCS, including pension and other postretirement benefit costs, were recorded in other operations and maintenance expense. Beginning in 2018, in connection with the adoption of ASU 2017-07, the service cost component of pension and postretirement benefit costs will be recorded in other operations and maintenance expense while the non-service cost components of pension and postretirement benefit costs will be recorded in other income (expense). See Note 1 under "General" for additional information.their respective regulatory
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Southern Power Company and Subsidiary Companies 2017 Annual Report

commissions. Southern Company Gas has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. For the year ending December 31, 2024, no contributions to any other postretirement trusts are expected.
Actuarial AssumptionsCurrent and Deferred Income Taxes
The weighted average rates assumed in the actuarial calculations used to determine the benefit obligations for the pension and other postretirement plans asDetails of the December 31, 2017 measurement dateincome tax provisions are presented below.
Assumptions used to determine benefit obligations:2017
Pension plans
Discount rate3.94%
Annual salary increase4.46
Other postretirement benefit plans
Discount rate3.81%
Annual salary increase4.46
In determining the amount of pension cost to be recognized in 2018, the Company estimates the expected rate of return on pension plan assets using a financial model to project the expected return on the current investment portfolio. The analysis projects an expected rate of return on each of the different asset classes in order to arrive at the expected return on the entire portfolio relying on the trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), the trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of the trust's portfolio.
An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) is a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO as of December 31, 2017 were as follows:
 Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached
Pre-656.50% 4.50% 2026
Post-65 medical5.00
 4.50
 2026
Post-65 prescription10.00
 4.50
 2026
An annual increase or decrease in the assumed medical care cost trend rate of 1% would have an immaterial effect on the APBO at December 31, 2017.
Pension Plan
The total accumulated benefit obligation for the pension plan was $111 million at December 31, 2017. The projected benefit obligation for the pension plan was $139 million and the fair value of plan assets was $138 million at December 31, 2017.
Presented below are the amounts included in AOCI at December 31, 2017 related to the Company's pension plan that had not yet been recognized in net periodic pension cost, along with the estimated amortization of such amounts for 2018.
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Federal —
Current$54 $242 $205 $49 $(320)$62 
Deferred299 (257)195 (26)334 68 
Total federal353 (15)400 23 14 130 
State —
Current41 82 37 1 (1)24 
Deferred102 14 11 12 (1)57 
Total state143 96 48 13 (2)81 
Total$496 $81 $448 $36 $12 $211 
II-194
 2017 Estimated Amortization in 2018
 (in millions)
Prior service cost$1
 $
Net (gain) loss32
 2
AOCI$33
  



COMBINED NOTES (continued)TO FINANCIAL STATEMENTS

2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Federal —
Current$10 $54 $38 $42 $(43)$122 
Deferred455 259 152 (16)56 (3)
Total federal465 313 190 26 13 119 
State —
Current27 14 (21)— 42 
Deferred303 96 201 11 19 
Total state330 110 180 11 61 
Total$795 $423 $370 $37 $20 $180 
2021
Southern CompanyAlabama PowerGeorgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
(in millions)
Federal —
Current$50 $104 $311 $25 $(340)$85 
Deferred36 172 (449)(15)343 35 
Total federal86 276 (138)10 120 
State —
Current(25)23 71 — (16)(68)
Deferred206 73 (101)11 — 223 
Total state181 96 (30)11 (16)155 
Total$267 $372 $(168)$21 $(13)$275 
Southern Company's and Southern Power's ITCs and PTCs generated in the current tax year and carried forward from prior tax years that cannot be utilized in the current tax year are reclassified from current to deferred taxes in federal income tax expense in the tables above. Southern Power's ITCs and PTCs reclassified in this manner include $5 million for 2023, $17 million for 2022, and $6 million for 2021. Southern Power Companyreceived $332 million, $49 million, and Subsidiary Companies 2017 Annual Report
$289 million of cash related to federal ITCs under renewable energy initiatives in 2023, 2022, and 2021, respectively. See "Deferred Tax Assets and Liabilities" herein for additional information.

Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligationIn accordance with regulatory requirements, deferred federal ITCs for the pension plan. At December 31, 2017, estimated benefit paymentstraditional electric operating companies are amortized over the average approximately $4 million each year forlife of the next five years,related property, with such amortization normally applied as a credit to reduce depreciation and for the five-year period from 2023 to 2027 estimated benefit payments are $27 million.
Other Postretirement Benefits
The APBO for the other postretirement benefit plan at December 31, 2017 is $11 million. Amounts recognizedamortization in the balance sheet at December 31, 2017 related to the Company's other postretirement benefit plan consiststatements of the following:
 2017
 (in millions)
Employee benefit obligations (included in other deferred credits and liabilities)$(11)
AOCI3
Presented below are the amounts included in AOCI at December 31, 2017 related to the other postretirement benefit plans that had not yet been recognized in net periodic other postretirement benefit cost along with the estimated amortization of such amounts for 2018.
 2017 
Estimated
Amortization
in 2018
 (in millions)
Net (gain) loss$3
 $
AOCI$3
  
Future benefit payments, which include any prescription drug benefits, and any offset from drug subsidiary receipts, are immaterial for each of the years 2018-2027.
Benefit Plan Assets
Pension plan assets are managed and invested in accordance with all applicable requirements, including ERISAincome. Southern Power's and the Internal Revenue Code of 1986, as amended. The Company's investment policies for the pension plan cover a diversified mix of assets, including equity and fixed income securities, real estate, and private equity. Derivative instruments are used primarily to gain efficient exposure to the various asset classes and as hedging tools. The Company minimizes the risk of large losses primarily through diversification but also monitors and manages other aspects of risk.
The composition of the Company's pension plan assets as of December 31, 2017, along with the targeted mix of assets for the plan, is presented below:
 Target 2017
Pension plan assets:   
Domestic equity26% 31%
International equity25
 25
Fixed income23
 24
Special situations3
 1
Real estate investments14
 13
Private equity9
 6
Total100% 100%
The investment strategy for plan assets related to the Company's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Company employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.
Investment Strategies
Detailed below is a description of the investment strategies for each major asset category for the pension benefit plan disclosed above:
Domestic equity. A mix of large and small capitalization stocks with generally an equalnatural gas distribution of value and growth attributes, managed both actively and through passive index approaches.
International equity. A mix of growth stocks and value stocks with both developed and emerging market exposure, managed both actively and through passive index approaches.
Fixed income. A mix of domestic and international bonds.
Special situations. Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficienciesutilities' deferred federal ITCs, as well as investments in promising new strategies of a longer-term nature.
Real estate investments. Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities.
Private equity. Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.
Benefit Plan Asset Fair Values
Followingcertain state ITCs for Nicor Gas, are amortized to income tax expense over the fair value measurements for the pension plan assets as of December 31, 2017. The fair values presented are prepared in accordance with GAAP. For purposes of determining the fair valuelife of the pension plan assetsrespective asset. ITCs amortized in 2023, 2022, and the appropriate level designation, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate.
Valuation methods of the primary fair value measurements disclosed in the following tables are as follows:
Domestic and international equity.Investments in equity securities such as common stocks, American depositary receipts, and real estate investment trusts that trade on a public exchange are classified as Level 1 investments and are valued at the closing price in the active market. Equity investments with unpublished prices (i.e. pooled funds) are valued as Level 2, when the underlying holdings used to value the investment are comprised of Level 1 or Level 2 equity securities.
Fixed income.Investments in fixed income securities are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Real estate investments, private equity, and special situations investments.Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples2021 were immaterial for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

The fair values of pension plan assets as of December 31, 2017 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$28
 $13
 $
 $
 $41
International equity(*)
18
 16
 
 
 34
Fixed income:         
U.S. Treasury, government, and agency bonds
 10
 
 
 10
Corporate bonds
 14
 
 
 14
Pooled funds
 8
 
 
 8
Cash equivalents and other2
 
 
 
 2
Real estate investments5
 
 
 14
 19
Special situations
 
 
 2
 2
Private equity
 
 
 8
 8
Total$53
 $61
 $
 $24
 $138
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
3. CONTINGENCIES AND REGULATORY MATTERS
General Litigation Matters
The Company is subject to certain claims and legal actions arising in the ordinary course of business. In addition, the Company's business activities are subject to extensive governmental regulation related to public health and the environment. Litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as standards for air, water, land, and protection of other natural resources, has occurred throughout the U.S. This litigation has included claims for damages alleged to have been caused by CO2 and other emissions and alleged exposure to hazardous materials, and/or requests for injunctive relief in connection with such matters. The ultimate outcome of such pending or potential litigation against the Company and its subsidiaries cannot be predicted at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements.
During 2015, the Company indirectly acquired a 51% membership interest in RE Roserock LLC (Roserock), the owner of the Roserock facility in Pecos County, Texas, which was under construction by Recurrent Energy, LLC and was subsequently placed in service in November 2016. Prior to placing the facility in service, certain solar panels were damaged during installation. While the facility currently is generating energy consistent with operational expectations and PPA obligations, the Company is pursuing remedies under its insurance policies and other contracts to repair or replace these solar panels. In connection therewith, the Company is withholding payments of approximately $26 million from the construction contractor, who has placed a lien on the Roserock facility for the same amount. The amounts withheld are included in other accounts payable and other current liabilities on the Company's consolidated balance sheets. On May 18, 2017, Roserock filed a lawsuit in the state district court in Pecos County, Texas, against XL Insurance America, Inc. (XL) and North American Elite Insurance Company (North American Elite) seeking recovery from an insurance policy for damages resulting from a hail storm and certain installation practices by the construction contractor, McCarthy Building Companies, Inc. (McCarthy). On May 19, 2017, Roserock filed a separate lawsuit against McCarthy in the state district court in Travis County, Texas alleging breach of contract and breach of warranty for the damages sustained at the Roserock facility, which has since been moved to the U.S. District Court for the Western District of Texas. On May 22, 2017, McCarthy filed a counter lawsuit against Roserock, Array Technologies, Inc., Canadian Solar (USA), Inc., XL, and North American Elite in the U.S. District Court for the Western District of Texas alleging, among other things,

NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

breach of contract, and requesting foreclosure of mechanic's liens against Roserock. On July 18, 2017, the U.S. District Court for the Western District of Texas consolidated the two pending lawsuits. On December 11, 2017, the U.S. District Court for the Western District of Texas dismissed McCarthy's claims against Canadian Solar (USA), Inc. and dismissed cross-claims that XL and North American Elite had sought to bring against Roserock. The Company intends to vigorously pursue and defend these matters, the ultimate outcome of which cannot be determined at this time.
FERC Matters
The Company and certain of its generation subsidiaries are subject to regulation by the FERC. The Company has authority from the FERC to sell electricity at market-based rates. Since 2008, that authority, for certain balancing authority areas, has been conditioned on compliance with the requirements of an energy auction, which the FERC found to be tailored mitigation that addresses potential market power concerns. In accordance with FERC regulations governing such authority, the traditional electric operating companies and Southern Company Gas and were as follows for Southern Company and Southern Power:
Southern CompanySouthern Power
(in millions)
2023$84 $58 
202283 58 
202184 58 
When Southern Power recognizes tax credits, the Company filedtax basis of the asset is reduced by 50% of the ITCs received, resulting in a triennial market power analysisnet deferred tax asset. Southern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in 2014,the year in which included continued reliance on the energy auction as tailored mitigation. In 2015,plant reaches commercial operation.
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COMBINED NOTES TO FINANCIAL STATEMENTS

State ITCs and other state credits, which are recognized in the FERC issuedperiod in which the credits are generated, reduced Georgia Power's income tax expense by $49 million in 2023, $53 million in 2022, and $66 million in 2021.
Southern Power's federal and state PTCs, which are recognized in the period in which the credits are generated, reduced Southern Power's income tax expense by $26 million in 2023, $27 million in 2022, and $16 million in 2021.
During the fourth quarter 2023, Southern Power executed an order finding thatagreement to transfer certain PTCs generated in 2023 and received cash of $12 million. The discount recognized was booked through income tax expense and was immaterial.
Pursuant to the traditional electric operating companies'Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power paid $39 million to the other Vogtle Owners for advanced nuclear PTCs for Plant Vogtle Unit 3. The gain recognized in 2023 was booked through income tax benefit and was immaterial.
Effective Tax Rate
Southern Company's effective tax rate is typically lower than the Company's existing tailored mitigation may not effectively mitigate the potentialstatutory rate due to exert market power in certain areas served byemployee stock plans' dividend deduction, non-taxable AFUDC equity at the traditional electric operating companies, flowback of excess deferred income taxes at the regulated utilities, and federal income tax benefits from ITCs and PTCs primarily at Southern Power.
In July 2021, Southern Company Gas affiliates completed the sale of Sequent. As a result of the sale, changes in some adjacent areas. state apportionment rates resulted in $85 million of additional net state tax expense. See Note 15 under "Southern Company Gas" for additional information.
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction2.6 5.2 1.5 4.9 (0.7)7.8 
Employee stock plans' dividend deduction(0.5)     
Non-deductible book depreciation0.7 0.7 0.8 0.4   
Flowback of excess deferred income taxes(9.2)(19.8)(2.6)(10.2) (2.6)
AFUDC-Equity(1.1)(1.2)(1.2)   
Federal PTCs(1.2) (1.4) (7.4) 
ITC amortization(1.3)(0.1)(0.1) (19.0) 
Noncontrolling interests0.6    11.1  
Other(0.2)(0.2)(0.3)0.1 0.1 (0.6)
Effective income tax (benefit) rate11.4 %5.6 %17.7 %16.2 %5.1 %25.6 %
II-196


COMBINED NOTES TO FINANCIAL STATEMENTS

2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction6.2 4.8 6.5 4.4 1.9 6.4 
Employee stock plans' dividend deduction(0.5)— — — — — 
Non-deductible book depreciation0.6 0.5 0.6 0.3 — — 
Flowback of excess deferred income taxes(6.6)(1.9)(9.6)(7.8)— (2.5)
AFUDC-Equity(1.1)(0.8)(1.5)— — — 
Federal PTCs— — — — (6.6)— 
ITC amortization(1.3)(0.1)(0.1)— (17.2)(0.1)
Noncontrolling interests0.5 — — — 8.4 — 
Other— 0.3 — 0.3 (0.1)(0.9)
Effective income tax (benefit) rate18.8 %23.8 %16.9 %18.2 %7.4 %23.9 %
2021
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction5.5 4.6 (5.7)4.9 (8.0)15.1 
Employee stock plans' dividend deduction(0.9)— — — — — 
Non-deductible book depreciation0.9 0.5 3.1 0.4 — — 
Flowback of excess deferred income taxes(11.7)(2.6)(49.9)(15.2)— (2.8)
AFUDC-Equity(1.5)(0.7)(6.4)— — — 
Federal PTCs— — — — (4.6)— 
ITC amortization(2.2)(0.1)(0.4)— (29.7)(0.1)
Noncontrolling interests0.8 — — — 13.4 — 
Leveraged lease impairments and dispositions(1.4)— — — — — 
Other(0.1)0.2 (1.9)0.6 (0.4)0.6 
Effective income tax (benefit) rate10.4 %22.9 %(40.2)%11.7 %(8.3)%33.8 %
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COMBINED NOTES TO FINANCIAL STATEMENTS

Deferred Tax Assets and Liabilities
The FERC directedtax effects of temporary differences between the traditional electric operating companiescarrying amounts of assets and liabilities in the Companyfinancial statements of the Registrants and their respective tax bases, which give rise to show why market-based rate authority should not be revoked in these areas ordeferred tax assets and liabilities, are as follows:
December 31, 2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred tax liabilities —
Accelerated depreciation$9,683 $2,566 $3,628 $339 $1,346 $1,576 
Property basis differences2,647 1,444 812 188 — 189 
Employee benefit obligations979 321 446 49 12 74 
AROs833 476 314 — — — 
Under recovered fuel and natural gas costs601 80 508 13 — — 
Regulatory assets –
AROs1,902 667 1,196 39 — — 
Employee benefit obligations797 213 260 37 — 11 
Remaining book value of retired assets369 143 221 — — 
Premium on reacquired debt63 53 — — 
Other700 182 223 43 191 
Total deferred income tax liabilities18,574 6,101 7,661 714 1,360 2,041 
Deferred tax assets —
AROs2,735 1,143 1,510 39 — — 
ITC and PTC carryforwards1,387 12 691 — 481 — 
Employee benefit obligations985 224 316 52 10 89 
Estimated loss on plants under construction857 — 857 — — — 
Estimated loss on regulatory disallowance26 — — — — 26 
Other state deferred tax attributes363 — 13 231 49 
Federal effect of net state deferred tax liabilities418 215 92 — 27 101 
Other property basis differences197 — 83 — 97 — 
State effect of federal deferred taxes115 115 — — — — 
Other partnership basis differences85 — — — 85 — 
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)34 30 — — — 
Long-term debt fair value adjustment79 — — — — 79 
Other comprehensive losses67 — — 
Other538 188 152 57 18 74 
Total deferred income tax assets7,886 1,931 3,718 382 773 377 
Valuation allowance(206)— (75)(41)(27)(7)
Net deferred income tax assets7,680 1,931 3,643 341 746 370 
Net deferred income taxes (assets)/liabilities$10,894 $4,170 $4,018 $373 $614 $1,671 
Recognized in the balance sheets:
Accumulated deferred income taxes – assets$(96)$ $ $(96)$ $ 
Accumulated deferred income taxes – liabilities$10,990 $4,170 $4,018 $469 $614 $1,671 
II-198

December 31, 2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred tax liabilities —
Accelerated depreciation$9,443 $2,564 $3,447 $338 $1,351 $1,505 
Property basis differences2,350 1,303 693 179 — 150 
Employee benefit obligations888 284 412 43 11 68 
AROs876 499 324 — — — 
Under recovered fuel and natural gas costs805 185 548 40 — 32 
Regulatory assets –
AROs2,006 679 1,285 42 — — 
Employee benefit obligations677 180 226 30 — 15 
Remaining book value of retired assets400 142 253 — — 
Premium on reacquired debt66 57 — — — 
Other555 179 181 40 14 82 
Total deferred income tax liabilities18,066 6,024 7,426 717 1,376 1,852 
Deferred tax assets —
AROs2,882 1,178 1,609 42 — — 
ITC and PTC carryforwards1,685 12 673 — 794 — 
Employee benefit obligations890 198 304 47 89 
Estimated loss on plants under construction888 — 888 — — — 
Other state deferred tax attributes388 — 12 239 51 
Federal effect of net state deferred tax liabilities365 175 88 — 28 92 
Other property basis differences207 — 79 — 109 — 
State effect of federal deferred taxes136 136 — — — — 
Other partnership basis differences111 — — — 111 — 
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)137 127 — — — 
Long-term debt fair value adjustment85 — — — — 85 
Other comprehensive losses72 — — 
Other552 213 186 62 17 28 
Total deferred income tax assets8,398 2,043 3,844 399 1,124 301 
Valuation allowance(257)— (125)(41)(27)(9)
Net deferred income tax assets8,141 2,043 3,719 358 1,097 292 
Net deferred income taxes (assets)/liabilities$9,925 $3,981 $3,707 $359 $279 $1,560 
Recognized in the balance sheets:
Accumulated deferred income taxes – assets$(111)$ $ $(107)$ $ 
Accumulated deferred income taxes – liabilities$10,036 $3,981 $3,707 $466 $279 $1,560 
The traditional electric operating companies and the Company filed a requestnatural gas distribution utilities have tax-related regulatory assets (deferred income tax charges) and regulatory liabilities (deferred income tax credits). The regulatory assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest. The regulatory liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and to unamortized ITCs. See Note 2 for rehearingeach Registrant's related balances at December 31, 2023 and filed their response with2022.
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COMBINED NOTES TO FINANCIAL STATEMENTS

Tax Credit Carryforwards
Federal ITC/PTC carryforwards at December 31, 2023 were as follows:
Southern CompanyAlabama
Power
Georgia
Power
Southern
Power
(in millions)
Federal ITC/PTC carryforwards$829 $12 $131 $481 
Tax year in which federal ITC/PTC carryforwards begin expiring2031203220312035
Year by which federal ITC/PTC carryforwards are expected to be utilized2029202820282029
The estimated tax credit utilization reflects the FERCvarious transactions described in 2015.
In December 2016,Note 15 and could be impacted by numerous factors, including the traditional electric operating companiesacquisition of additional renewable projects, changes in taxable income projections, transfer of eligible credits, potential income tax rate changes, and the Company filed an amendment to their market-based rate tariff that proposed certain changesultimate implementation of the natural gas safe harbor method for repairs. In the third quarter 2023, Georgia Power started generating advanced nuclear PTCs for Plant Vogtle Unit 3 beginning on the in-service date of July 31, 2023. In addition, pursuant to the energy auction, as well as several non-tariff changes. On FebruaryGlobal Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 2017,under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 from the FERC issued an order accepting all such changes subject to another Vogtle Owners. See Note 2 under "Georgia Power – Nuclear Construction" for additional condition of cost-based price caps for certain sales outside of the energy auction, finding that all of these changes would provide adequate alternative mitigationinformation on Plant Vogtle Units 3 and 4.
At December 31, 2023, Georgia Power also had approximately $452 million in net state investment and other net state tax credit carryforwards for the traditional electric operating companies'State of Georgia that will expire between tax years 2023 and the Company's potential2032 and are not expected to exert market power in certain areas served by the traditional electric operating companies and in some adjacent areas. On May 17, 2017, the FERC accepted the traditional electric operating companies' and the Company's compliance filing accepting the termsbe fully utilized. Georgia Power has a net state valuation allowance of the order. While the FERC's February 2, 2017 order references the market power proceeding discussed above, it remains a separate, ongoing matter.
On October 25, 2017, the FERC issued an order in response to the traditional electric operating companies' and the Company's June 29, 2017 triennial updated market power analysis. The FERC directed the traditional electric operating companies and the Company to show cause within 60 days why market-based rate authority should not be revoked in certain areas adjacent to the area presently under mitigation in accordance$60 million associated with the February 2, 2017 order or to provide a mitigation plan to further address market power concerns. On November 10, 2017, the traditional electric operating companies and the Company responded to the FERC and proposed to resolve matters by applying the alternative mitigation authorized by the February 2, 2017 order to the adjacent areas made the subject of the October 25, 2017 order.these carryforwards.
The ultimate outcome of these matters cannot be determined at this time.
Net Operating Loss Carryforwards
4. JOINT OWNERSHIP AGREEMENTS
The Company is a 65% owner of Plant Stanton A, a natural gas-fired combined-cycle unit with a nameplate capacity of 659 MWs. The unit is co-owned by the Orlando Utilities Commission (28%), the Florida Municipal Power Agency (3.5%), and the Kissimmee Utility Authority (3.5%). The Company has a service agreement with SCS whereby SCS is responsible for the operation and maintenance of Plant Stanton A. As ofAt December 31, 2017, $155 million was recorded in plant in service with associated accumulated depreciation of $55 million. These amounts represent2023, the Company's share of total plant assets and each owner is responsible for providing its own financing. The Company's proportionate share of Plant Stanton A's operating expense is included in the corresponding operating expenses in the consolidated statements of income.
5. INCOME TAXES
On behalf of the Company, Southern Company files a consolidated federal income tax return and variousnet state income tax returns, somebenefit of which are combined, unitary, or consolidated. Under a joint consolidated income tax allocation agreement, eachstate and local NOL carryforwards for Southern Company's subsidiaries were as follows:
Company/JurisdictionApproximate Net State Income Tax Benefit of NOL CarryforwardsTax Year NOL
Begins Expiring
(in millions)
Mississippi Power
Mississippi$183 2032
Southern Power
Oklahoma26 2035
Florida10 2034
Other statesVarious
Southern Power Total$38 
Other(*)
New York11 2036
New York City14 2036
Other states30 Various
Southern Company Total$276 
(*)Represents other non-registrant Southern Company subsidiary's currentsubsidiaries. Alabama Power, Georgia Power, and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability.Southern Company Gas did not have material state or local NOL carryforwards at December 31, 2023.
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State NOLs for Mississippi, Oklahoma, and Florida are not expected to be fully utilized prior to expiration. At December 31, 2023, Mississippi Power had a net state valuation allowance of $32 million for the Mississippi NOL, Southern Power Company and Subsidiary Companies 2017 Annual Report

Federal Tax Reform Legislation
Following the enactmenthad net state valuation allowances of the Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP$11 million for the tax effects ofOklahoma NOL and $10 million for the legislation. Due to the complexFlorida NOL, and comprehensive nature of the enacted tax law changes, and their application under GAAP, Southern Company considers all amounts recorded inhad a net valuation allowance of $25 million for the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118New York and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. New York City NOLs.
The ultimate impactoutcome of the Tax Reform Legislation on deferred income tax assets and liabilitiesthese matters cannot be determined at this time.
Unrecognized Tax Benefits
Changes in unrecognized tax benefits for the periods presented were as follows:
Southern
Company
Georgia
Power
Southern
Company Gas
(in millions)
Unrecognized tax benefits at December 31, 2020$44 $— $— 
Tax positions changes –
Increase from prior periods— — 
Unrecognized tax benefits at December 31, 202147 — — 
Tax positions changes –
Increase from prior periods33 — 32 
Unrecognized tax benefits at December 31, 202280 — 32 
Tax positions changes –
Increase from prior periods88 86 
Statute of limitations expiration(52)(9)— 
Unrecognized tax benefits at December 31, 2023$116 $77 $34 
The unrecognized tax positions increase from prior periods for 2022 is primarily related to the amendment of certain 2018 state tax filing positions related to Southern Company Gas dispositions. If accepted by the states, these positions would decrease Southern Company's and Southern Company Gas' annual effective tax rates. The ultimate outcome of these unrecognized tax benefits is dependent on acceptance by each state and is not expected to be resolved within the next 12 months.
The unrecognized tax positions increase from prior periods for 2023 are primarily related to the amendment of certain 2019 through 2021 state tax filing positions related to tax credit utilization, a portion of which decreased in the fourth quarter 2023 due to a statute of limitations expiration. If effective settlement of the positions is favorable, these positions would decrease Southern Company's and Georgia Power's annual effective tax rates. The ultimate outcome of this unrecognized tax benefit, of which a portion is expected to be resolved within the next 12 months, is dependent on acceptance by the state or expiration of related statute of limitations.
The unrecognized tax positions reductions due to statute of limitations expiration for 2023 primarily relates to a 2019 state tax filing position to exclude certain gains from 2019 dispositions from taxation in a certain unitary state. This tax position and related interest was recognized in the fourth quarter 2023 and decreased Southern Company's annual effective tax rate.
All of the Registrants classify interest on tax uncertainties as interest expense. Accrued interest for all tax positions was immaterial for all years presented. None of the Registrants accrued any penalties on uncertain tax positions.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2022. Southern Company is a participant in the Compliance Assurance Process of the IRS. The IRS has selected six Southern Power partnership returns for exam for the 2020 and 2021 tax years. The ultimate outcome of this matter cannot be determined at this time. The audits for the Registrants' state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2015.
11. RETIREMENT BENEFITS
The Southern Company system has a qualified defined benefit, trusteed pension plan covering substantially all employees, with the exception of PowerSecure employees. The qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2023 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2024. The Southern Company system also provides certain non-qualified defined benefits for a select group of management and highly compensated employees, which are funded on a cash basis. In addition, the Southern Company system provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The traditional electric operating companies fund other postretirement trusts to the extent required by their respective regulatory
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commissions. Southern Company Gas has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. For the year ending December 31, 2024, no contributions to any other postretirement trusts are expected.
Current and Deferred Income Taxes
Details of income tax provisions are as follows:
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Federal —
Current$54 $242 $205 $49 $(320)$62 
Deferred299 (257)195 (26)334 68 
Total federal353 (15)400 23 14 130 
State —
Current41 82 37 1 (1)24 
Deferred102 14 11 12 (1)57 
Total state143 96 48 13 (2)81 
Total$496 $81 $448 $36 $12 $211 
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 2017 2016 2015
 (in millions)
Federal —     
Current (*)
$(566) $928
 $12
Deferred (*)
(312) (1,098) 10
 (878) (170) 22
State —     
Current(110) (60) (32)
Deferred49
 35
 31
 (61) (25) (1)
Total$(939) $(195) $21
(*)ITCs and PTCs generated in the current tax year and carried forward from prior tax years that cannot be utilized in the current tax year are reclassified from current to deferred taxes in federal income tax expense above. ITCs and PTCs reclassified in this manner include $316 million for 2017, $1.13 billion for 2016, and $246 million for 2015. These ITCs and PTCs are included in the following table of temporary differences as unrealized tax credits.



COMBINED NOTES (continued)TO FINANCIAL STATEMENTS

2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Federal —
Current$10 $54 $38 $42 $(43)$122 
Deferred455 259 152 (16)56 (3)
Total federal465 313 190 26 13 119 
State —
Current27 14 (21)— 42 
Deferred303 96 201 11 19 
Total state330 110 180 11 61 
Total$795 $423 $370 $37 $20 $180 
2021
Southern CompanyAlabama PowerGeorgia
Power
Mississippi
Power
Southern PowerSouthern Company Gas
(in millions)
Federal —
Current$50 $104 $311 $25 $(340)$85 
Deferred36 172 (449)(15)343 35 
Total federal86 276 (138)10 120 
State —
Current(25)23 71 — (16)(68)
Deferred206 73 (101)11 — 223 
Total state181 96 (30)11 (16)155 
Total$267 $372 $(168)$21 $(13)$275 
Southern Power CompanyCompany's and Subsidiary Companies 2017 Annual Report

The tax effects of temporary differences between the carrying amounts of assetsSouthern Power's ITCs and liabilitiesPTCs generated in the financial statementscurrent tax year and their respectivecarried forward from prior tax bases, which give riseyears that cannot be utilized in the current tax year are reclassified from current to deferred tax assets and liabilities, are as follows:
 20172016
 (in millions)
Deferred tax liabilities —  
Accelerated depreciation and other property basis differences$1,922
$2,440
Levelized capacity revenues26
28
Other6
27
Total deferred income tax liabilities1,954
2,495
Deferred tax assets —  
Federal effect of state deferred taxes42
53
Basis difference on ITCs184
292
Alternative minimum tax carryforward21
15
Unrealized tax credits2,002
1,685
Federal net operating loss (NOL)333
808
Deferred state tax assets77
60
Other partnership basis differences24
16
Other10
8
Total deferred income tax assets2,693
2,937
Valuation Allowance(13)
Net deferred income tax assets2,680
2,937
Total deferred income tax asset (liability)$726
$442
   
Recognized in the consolidated balance sheets:  
Accumulated deferred income taxes – assets$925
$594
Accumulated deferred income taxes – liability$(199)$(152)
Deferred tax liabilities are primarily the result of property-related timing differences, which increased due to bonus depreciation. However, the implementation of the Tax Reform Legislation significantly reduced the amount of accumulated deferred income taxes at December 31, 2017.
Deferred tax assets consist primarily of timing differences related to the carryforward of unrealized federal ITCs, PTCs, net operating loss, and net basis differences on federal ITCs.
Tax Credit Carryforwards
At December 31, 2017, the Company had federal ITC and PTC carryforwards, which are expected to result in $2.0 billion of federal income tax benefits. Theexpense in the tables above. Southern Power's ITCs and PTCs reclassified in this manner include $5 million for 2023, $17 million for 2022, and $6 million for 2021. Southern Power received $332 million, $49 million, and $289 million of cash related to federal ITC carryforwards begin expiringITCs under renewable energy initiatives in 2034 but2023, 2022, and 2021, respectively. See "Deferred Tax Assets and Liabilities" herein for additional information.
In accordance with regulatory requirements, deferred federal ITCs for the traditional electric operating companies are expected to be fully utilized by 2027. The PTC carryforwards begin expiring in 2036 but are also expected to be fully utilized by 2027. The acquisition of additional renewable projects could further delayamortized over the utilization of existing tax credit carryforwards. The ultimate outcome of these matters cannot be determined at this time.
Net Operating Loss
After carrying back portionsaverage life of the federal NOL generatedrelated property, with such amortization normally applied as a credit to reduce depreciation and amortization in 2016,the statements of income. Southern Company had a consolidated federal NOL carryforward of approximately $2.3 billion at December 31, 2017. The federal NOL will expire in 2037 but is expected to be fully utilized by 2019. The ultimate outcome of this matter cannot be determined at this time.

NOTES (continued)
Southern Power CompanyPower's and Subsidiary Companies 2017 Annual Report

The Company had state NOL carryforwards of approximately $1.3 billion at December 31, 2017, which will expire from 2029 to 2035. These carryforwards resulted inthe natural gas distribution utilities' deferred tax assets of approximately $61 million as of December 31, 2017. The state NOL carryforwards by state jurisdiction were as follows:
JurisdictionApproximate NOL CarryforwardsApproximate Net State Income Tax BenefitTax Year NOL Expires
 (in millions) 
Oklahoma$978
$46
2035
Florida283
12
2033
South Carolina48
2
2035
Other states23
1
2029-2035
Balance at year end$1,332
$61
 
Effective Tax Rate
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
 2017 2016 2015
Federal statutory rate35.0 % 35.0 % 35.0 %
State income tax, net of federal deduction(22.2) (9.1) (0.3)
Amortization of ITC(31.8) (20.6) (5.0)
ITC basis difference(10.0) (89.0) (21.5)
Production tax credits(72.5) (23.3) (0.6)
Tax Reform Legislation(416.1) 
 
Noncontrolling interests(8.6) (6.2) (1.7)
Other0.5
 4.6
 2.5
Effective income tax rate (benefit)(525.7)% (108.6)% 8.4 %
The Company's effective tax rate decreased in 2017 primarily due to the Tax Reform Legislation. The decrease in 2016 was primarily due to changes in federal ITCs, and PTCs.
The Company's deferred federalas well as certain state ITCs for Nicor Gas, are amortized to income tax expense over the life of the respective asset. ITCs amortized in this manner amounted to $57 million in 2017, $37 million in 2016,2023, 2022, and $19 million in 2015. Also, the Company received cash related to federal ITCs under the renewable energy incentives of $162 million2021 were immaterial for the year ended December 31, 2015. While no cash was received related to these incentives in 2017 or 2016, thetraditional electric operating companies and Southern Company recognizedGas and were as follows for Southern Company and Southern Power:
Southern CompanySouthern Power
(in millions)
2023$84 $58 
202283 58 
202184 58 
When Southern Power recognizes tax credits. Furthermore,credits, the tax basis of the asset is reduced by 50% of the ITCs received, resulting in a net deferred tax asset. The CompanySouthern Power has elected to recognize the tax benefit of this basis difference as a reduction to income tax expense in the year in which the plant reaches commercial operation. The tax benefit
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State ITCs and other state credits, which are recognized in the related basis differencesperiod in which the credits are generated, reduced Georgia Power's income tax expense by $18$49 million in 2017, $1732023, $53 million in 2016,2022, and $54$66 million in 2015. The tax benefit of2021.
Southern Power's federal and state PTCs, which are recognized in the period in which the credits are generated, reduced Southern Power's income tax expense by $129$26 million in 2017, $422023, $27 million in 20162022, and $1$16 million in 2015. See "Unrecognized2021.
During the fourth quarter 2023, Southern Power executed an agreement to transfer certain PTCs generated in 2023 and received cash of $12 million. The discount recognized was booked through income tax expense and was immaterial.
Pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power paid $39 million to the other Vogtle Owners for advanced nuclear PTCs for Plant Vogtle Unit 3. The gain recognized in 2023 was booked through income tax benefit and was immaterial.
Effective Tax Benefits" herein for further information.Rate
Legal Entity ReorganizationSouthern Company's effective tax rate is typically lower than the statutory rate due to employee stock plans' dividend deduction, non-taxable AFUDC equity at the traditional electric operating companies, flowback of excess deferred income taxes at the regulated utilities, and federal income tax benefits from ITCs and PTCs primarily at Southern Power.
In September 2017,July 2021, Southern Power beganCompany Gas affiliates completed the sale of Sequent. As a legal entity reorganization of various direct and indirect subsidiaries that own and operate substantially allresult of the solar facilities, including certain subsidiaries owned in partnership with various third parties. The reorganization included the purchase of all of the redeemable noncontrolling interests, representing 10% of the membership interests, in Southern Turner Renewable Energy, LLC. The reorganization is expected to be substantially completed in the first quarter 2018 and is expected to result in estimated tax benefits totaling between $50 million and $55 million related to certainsale, changes in state apportionment rates resulted in $85 million of additional net state tax expense. See Note 15 under "Southern Company Gas" for additional information.
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction2.6 5.2 1.5 4.9 (0.7)7.8 
Employee stock plans' dividend deduction(0.5)     
Non-deductible book depreciation0.7 0.7 0.8 0.4   
Flowback of excess deferred income taxes(9.2)(19.8)(2.6)(10.2) (2.6)
AFUDC-Equity(1.1)(1.2)(1.2)   
Federal PTCs(1.2) (1.4) (7.4) 
ITC amortization(1.3)(0.1)(0.1) (19.0) 
Noncontrolling interests0.6    11.1  
Other(0.2)(0.2)(0.3)0.1 0.1 (0.6)
Effective income tax (benefit) rate11.4 %5.6 %17.7 %16.2 %5.1 %25.6 %
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2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction6.2 4.8 6.5 4.4 1.9 6.4 
Employee stock plans' dividend deduction(0.5)— — — — — 
Non-deductible book depreciation0.6 0.5 0.6 0.3 — — 
Flowback of excess deferred income taxes(6.6)(1.9)(9.6)(7.8)— (2.5)
AFUDC-Equity(1.1)(0.8)(1.5)— — — 
Federal PTCs— — — — (6.6)— 
ITC amortization(1.3)(0.1)(0.1)— (17.2)(0.1)
Noncontrolling interests0.5 — — — 8.4 — 
Other— 0.3 — 0.3 (0.1)(0.9)
Effective income tax (benefit) rate18.8 %23.8 %16.9 %18.2 %7.4 %23.9 %
2021
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
State income tax, net of federal deduction5.5 4.6 (5.7)4.9 (8.0)15.1 
Employee stock plans' dividend deduction(0.9)— — — — — 
Non-deductible book depreciation0.9 0.5 3.1 0.4 — — 
Flowback of excess deferred income taxes(11.7)(2.6)(49.9)(15.2)— (2.8)
AFUDC-Equity(1.5)(0.7)(6.4)— — — 
Federal PTCs— — — — (4.6)— 
ITC amortization(2.2)(0.1)(0.4)— (29.7)(0.1)
Noncontrolling interests0.8 — — — 13.4 — 
Leveraged lease impairments and dispositions(1.4)— — — — — 
Other(0.1)0.2 (1.9)0.6 (0.4)0.6 
Effective income tax (benefit) rate10.4 %22.9 %(40.2)%11.7 %(8.3)%33.8 %
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Deferred Tax Assets and Liabilities
The tax effects of temporary differences between the carrying amounts of assets and liabilities in the financial statements of the Registrants and their respective tax bases, which give rise to deferred tax assets and liabilities, are as follows:
December 31, 2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred tax liabilities —
Accelerated depreciation$9,683 $2,566 $3,628 $339 $1,346 $1,576 
Property basis differences2,647 1,444 812 188 — 189 
Employee benefit obligations979 321 446 49 12 74 
AROs833 476 314 — — — 
Under recovered fuel and natural gas costs601 80 508 13 — — 
Regulatory assets –
AROs1,902 667 1,196 39 — — 
Employee benefit obligations797 213 260 37 — 11 
Remaining book value of retired assets369 143 221 — — 
Premium on reacquired debt63 53 — — 
Other700 182 223 43 191 
Total deferred income tax liabilities18,574 6,101 7,661 714 1,360 2,041 
Deferred tax assets —
AROs2,735 1,143 1,510 39 — — 
ITC and PTC carryforwards1,387 12 691 — 481 — 
Employee benefit obligations985 224 316 52 10 89 
Estimated loss on plants under construction857 — 857 — — — 
Estimated loss on regulatory disallowance26 — — — — 26 
Other state deferred tax attributes363 — 13 231 49 
Federal effect of net state deferred tax liabilities418 215 92 — 27 101 
Other property basis differences197 — 83 — 97 — 
State effect of federal deferred taxes115 115 — — — — 
Other partnership basis differences85 — — — 85 — 
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)34 30 — — — 
Long-term debt fair value adjustment79 — — — — 79 
Other comprehensive losses67 — — 
Other538 188 152 57 18 74 
Total deferred income tax assets7,886 1,931 3,718 382 773 377 
Valuation allowance(206)— (75)(41)(27)(7)
Net deferred income tax assets7,680 1,931 3,643 341 746 370 
Net deferred income taxes (assets)/liabilities$10,894 $4,170 $4,018 $373 $614 $1,671 
Recognized in the balance sheets:
Accumulated deferred income taxes – assets$(96)$ $ $(96)$ $ 
Accumulated deferred income taxes – liabilities$10,990 $4,170 $4,018 $469 $614 $1,671 
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December 31, 2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Deferred tax liabilities —
Accelerated depreciation$9,443 $2,564 $3,447 $338 $1,351 $1,505 
Property basis differences2,350 1,303 693 179 — 150 
Employee benefit obligations888 284 412 43 11 68 
AROs876 499 324 — — — 
Under recovered fuel and natural gas costs805 185 548 40 — 32 
Regulatory assets –
AROs2,006 679 1,285 42 — — 
Employee benefit obligations677 180 226 30 — 15 
Remaining book value of retired assets400 142 253 — — 
Premium on reacquired debt66 57 — — — 
Other555 179 181 40 14 82 
Total deferred income tax liabilities18,066 6,024 7,426 717 1,376 1,852 
Deferred tax assets —
AROs2,882 1,178 1,609 42 — — 
ITC and PTC carryforwards1,685 12 673 — 794 — 
Employee benefit obligations890 198 304 47 89 
Estimated loss on plants under construction888 — 888 — — — 
Other state deferred tax attributes388 — 12 239 51 
Federal effect of net state deferred tax liabilities365 175 88 — 28 92 
Other property basis differences207 — 79 — 109 — 
State effect of federal deferred taxes136 136 — — — — 
Other partnership basis differences111 — — — 111 — 
Regulatory liability associated with the Tax Reform Legislation (not subject to normalization)137 127 — — — 
Long-term debt fair value adjustment85 — — — — 85 
Other comprehensive losses72 — — 
Other552 213 186 62 17 28 
Total deferred income tax assets8,398 2,043 3,844 399 1,124 301 
Valuation allowance(257)— (125)(41)(27)(9)
Net deferred income tax assets8,141 2,043 3,719 358 1,097 292 
Net deferred income taxes (assets)/liabilities$9,925 $3,981 $3,707 $359 $279 $1,560 
Recognized in the balance sheets:
Accumulated deferred income taxes – assets$(111)$ $ $(107)$ $ 
Accumulated deferred income taxes – liabilities$10,036 $3,981 $3,707 $466 $279 $1,560 
The traditional electric operating companies and the natural gas distribution utilities have tax-related regulatory assets (deferred income tax charges) and regulatory liabilities (deferred income tax credits). The regulatory assets are primarily attributable to tax benefits flowed through to customers in prior years, deferred taxes previously recognized at rates lower than the current enacted tax law, and taxes applicable to capitalized interest. The regulatory liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and to unamortized ITCs. See Note 2 for each Registrant's related balances at December 31, 2023 and 2022.
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Tax Credit Carryforwards
Federal ITC/PTC carryforwards at December 31, 2023 were as follows:
Southern CompanyAlabama
Power
Georgia
Power
Southern
Power
(in millions)
Federal ITC/PTC carryforwards$829 $12 $131 $481 
Tax year in which federal ITC/PTC carryforwards begin expiring2031203220312035
Year by which federal ITC/PTC carryforwards are expected to be utilized2029202820282029
The estimated tax credit utilization reflects the various transactions described in Note 15 and could be impacted by numerous factors, including the acquisition of additional renewable projects, changes in taxable income projections, transfer of eligible credits, potential income tax rate changes, and the ultimate implementation of the natural gas safe harbor method for repairs. In the third quarter 2023, Georgia Power started generating advanced nuclear PTCs for Plant Vogtle Unit 3 beginning on the in-service date of July 31, 2023. In addition, pursuant to the Global Amendments to the Vogtle Joint Ownership Agreements (as defined in Note 2 under "Georgia Power – Nuclear Construction – Joint Owner Contracts"), Georgia Power is purchasing advanced nuclear PTCs for Plant Vogtle Unit 3 from the other Vogtle Owners. See Note 2 under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4.
At December 31, 2023, Georgia Power also had approximately $452 million in net operating loss carryforward utilizationstate investment and other net state tax credit carryforwards for the State of Georgia that will expire between tax years 2023 and 2032 and are not expected to be recorded in the first quarter 2018. fully utilized. Georgia Power has a net state valuation allowance of $60 million associated with these carryforwards.
The ultimate outcome of this matterthese matters cannot be determined at this time.
Net Operating Loss Carryforwards
At December 31, 2023, the net state income tax benefit of state and local NOL carryforwards for Southern Company's subsidiaries were as follows:
Company/JurisdictionApproximate Net State Income Tax Benefit of NOL CarryforwardsTax Year NOL
Begins Expiring
(in millions)
Mississippi Power
Mississippi$183 2032
Southern Power
Oklahoma26 2035
Florida10 2034
Other statesVarious
Southern Power Total$38 
Other(*)
New York11 2036
New York City14 2036
Other states30 Various
Southern Company Total$276 
(*)Represents other non-registrant Southern Company subsidiaries. Alabama Power, Georgia Power, and Southern Company Gas did not have material state or local NOL carryforwards at December 31, 2023.
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State NOLs for Mississippi, Oklahoma, and Florida are not expected to be fully utilized prior to expiration. At December 31, 2023, Mississippi Power had a net state valuation allowance of $32 million for the Mississippi NOL, Southern Power had net state valuation allowances of $11 million for the Oklahoma NOL and $10 million for the Florida NOL, and Southern Company had a net valuation allowance of $25 million for the New York and Subsidiary Companies 2017 Annual Report
New York City NOLs.

The ultimate outcome of these matters cannot be determined at this time.
Unrecognized Tax Benefits
Changes during the year in unrecognized tax benefits for the periods presented were as follows:
 2017 2016 2015
 (in millions)
Balance at beginning of year$17
 $8
 $5
Tax positions increase from current periods
 17
 9
Tax positions decrease from prior periods(17) (8) (6)
Balance at end of year$
 $17
 $8
Southern
Company
Georgia
Power
Southern
Company Gas
(in millions)
Unrecognized tax benefits at December 31, 2020$44 $— $— 
Tax positions changes –
Increase from prior periods— — 
Unrecognized tax benefits at December 31, 202147 — — 
Tax positions changes –
Increase from prior periods33 — 32 
Unrecognized tax benefits at December 31, 202280 — 32 
Tax positions changes –
Increase from prior periods88 86 
Statute of limitations expiration(52)(9)— 
Unrecognized tax benefits at December 31, 2023$116 $77 $34 
The increase in unrecognized tax benefits from current periods for all years presented, and the decreasepositions increase from prior periods for all years presented,2022 is primarily relaterelated to federal incomethe amendment of certain 2018 state tax filing positions related to Southern Company Gas dispositions. If accepted by the states, these positions would decrease Southern Company's and Southern Company Gas' annual effective tax rates. The ultimate outcome of these unrecognized tax benefits is dependent on acceptance by each state and is not expected to be resolved within the next 12 months.
The unrecognized tax positions increase from deferred ITCsprior periods for 2023 are primarily related to the amendment of certain 2019 through 2021 state tax filing positions related to tax credit utilization, a portion of which decreased in the fourth quarter 2023 due to a statute of limitations expiration. If effective settlement of the positions is favorable, these positions would decrease Southern Company's and would all impact the Company'sGeorgia Power's annual effective tax rate, if recognized.rates. The impactultimate outcome of this unrecognized tax benefit, of which a portion is expected to be resolved within the next 12 months, is dependent on acceptance by the state or expiration of related statute of limitations.
The unrecognized tax positions reductions due to statute of limitations expiration for 2023 primarily relates to a 2019 state tax filing position to exclude certain gains from 2019 dispositions from taxation in a certain unitary state. This tax position and related interest was recognized in the fourth quarter 2023 and decreased Southern Company's annual effective tax rate is determined based onrate.
All of the amount of ITCs which are uncertain.
The Company classifiesRegistrants classify interest on tax uncertainties as interest expense. Accrued interest for unrecognizedall tax benefitspositions was immaterial for all periodsyears presented. The Company did not accrueNone of the Registrants accrued any penalties on uncertain tax positions.
It is reasonably possible that the amount of the unrecognized tax benefits could change within 12 months. The settlement of federal and state audits could impact the balances. At this time, an estimate of the range of reasonably possible outcomes cannot be determined.
The IRS has finalized its audits of Southern Company's consolidated federal income tax returns through 2016.2022. Southern Company is a participant in the Compliance Assurance Process of the IRS. The IRS has selected six Southern Power partnership returns for exam for the 2020 and 2021 tax years. The ultimate outcome of this matter cannot be determined at this time. The audits for the Company'sRegistrants' state income tax returns have either been concluded, or the statute of limitations has expired, for years prior to 2011.2015.
6. FINANCING11. RETIREMENT BENEFITS
The Southern Power Company's senior notes, bank term loans, commercial paper, and Facility (asCompany system has a qualified defined herein) are unsecured senior indebtedness, which rank equallybenefit, trusteed pension plan covering substantially all employees, with all other unsecured and unsubordinated debtthe exception of Southern Power Company.PowerSecure employees. The Company's subsidiaries are not issuers, borrowers, or obligors, as applicable, under the senior notes, borrowings from financial institutions, commercial paper, or the Facility. The senior notes, borrowings from financial institutions, commercial paper, and the Facility are effectively subordinated to any future secured debt of Southern Power Company and any potential claims of creditorsqualified pension plan is funded in accordance with requirements of the Company's subsidiaries. AsEmployee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2017,2023 and no mandatory contributions to the Company had no secured debt.
Securities Due Within One Year
Atqualified pension plan are anticipated for the year ending December 31, 2017,2024. The Southern Company system also provides certain non-qualified defined benefits for a select group of management and highly compensated employees, which are funded on a cash basis. In addition, the Southern Company had $420 million in term loanssystem provides certain medical care and $350 million of senior notes due within one year. At December 31, 2016,life insurance benefits for retired employees through other postretirement benefit plans. The traditional electric operating companies fund other postretirement trusts to the Company had a $60 million term loan, $500 million of senior notes, and $1 million of long-term notes due within one year.
Maturities of long-term debt for the next five years are as follows:extent required by their respective regulatory
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 December 31, 2017
 (in millions)
2018$770
2019600
2020825
2021300
2022(*)
677
(*)Represents euro-denominated debt at the U.S. dollar denominated hedge settlement amount.
Senior Notes
In November 2017, the Company issued $525 million aggregate principal amount of Series 2017A Floating Rate Senior Notes due December 20, 2020, which bear interest based on three-month LIBOR. The net proceeds were used to redeem all of the $500 million aggregate principal amount of Series 2015D 1.85% Senior Notes due December 1, 2017 and to repay a portion of the Company's outstanding short-term debt.

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COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Southern Power Company and Subsidiary Companies 2017 Annual Report

Atcommissions. Southern Company Gas has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. For the year ending December 31, 20172024, no contributions to any other postretirement trusts are expected.
Actuarial Assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and 2016,other postretirement benefit plans for the Company had $5.5following year and the benefit obligations as of the measurement date are presented below.
2023
Assumptions used to determine net
periodic costs:
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Pension plans
Discount rate – benefit obligations5.25 %5.26 %5.25 %5.25 %5.31 %5.24 %
Discount rate – interest costs5.13 5.14 5.12 5.12 5.19 5.12 
Discount rate – service costs5.36 5.38 5.38 5.37 5.37 5.31 
Expected long-term return on plan assets8.40 8.40 8.40 8.40 8.40 8.40 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
Other postretirement benefit plans
Discount rate – benefit obligations5.18 %5.20 %5.17 %5.17 %5.24 %5.16 %
Discount rate – interest costs5.08 5.09 5.07 5.08 5.12 5.07 
Discount rate – service costs5.34 5.35 5.34 5.33 5.33 5.33 
Expected long-term return on plan assets7.67 7.95 7.49 7.43  6.59 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
2022
Assumptions used to determine net
periodic costs:
Southern CompanyAlabama
Power
Georgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Pension plans
Discount rate – benefit obligations3.09 %3.12 %3.07 %3.07 %3.21 %3.04 %
Discount rate – interest costs2.55 2.58 2.51 2.54 2.79 2.53 
Discount rate – service costs3.34 3.36 3.37 3.35 3.36 3.21 
Expected long-term return on plan assets8.25 8.25 8.25 8.25 8.25 8.25 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
Other postretirement benefit plans
Discount rate – benefit obligations2.90 %2.95 %2.87 %2.88 %3.07 %2.82 %
Discount rate – interest costs2.32 2.38 2.30 2.27 2.55 2.17 
Discount rate – service costs3.26 3.30 3.27 3.26 3.25 3.22 
Expected long-term return on plan assets7.21 7.54 6.88 7.22 — 6.08 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
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2021
Assumptions used to determine net periodic costs:Southern CompanyAlabama
Power
Georgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
Pension plans
Discount rate – benefit obligations2.81 %2.85 %2.79 %2.80 %2.99 %2.75 %
Discount rate – interest costs2.13 2.17 2.09 2.12 2.46 2.10 
Discount rate – service costs3.18 3.23 3.21 3.20 3.22 2.97 
Expected long-term return on plan assets8.25 8.25 8.25 8.25 8.25 8.25 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
Other postretirement benefit plans
Discount rate – benefit obligations2.56 %2.63 %2.52 %2.53 %2.78 %2.46 %
Discount rate – interest costs1.84 1.91 1.82 1.78 2.12 1.64 
Discount rate – service costs3.07 3.13 3.08 3.06 3.05 3.01 
Expected long-term return on plan assets7.09 7.18 6.84 6.98 — 6.54 
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
2023
Assumptions used to determine benefit obligations:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
Pension plans
Discount rate5.07 %5.08 %5.06 %5.06 %5.14 %5.05 %
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
Other postretirement benefit plans
Discount rate4.99 %5.01 %4.98 %4.98 %5.06 %4.98 %
Annual salary increase4.60 4.60 4.60 4.60 4.60 4.60 
2022
Assumptions used to determine benefit obligations:Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
Pension plans
Discount rate5.25 %5.26 %5.25 %5.25 %5.31 %5.24 %
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
Other postretirement benefit plans
Discount rate5.18 %5.20 %5.17 %5.17 %5.24 %5.16 %
Annual salary increase4.80 4.80 4.80 4.80 4.80 4.80 
The Registrants estimate the expected rate of return on pension plan and other postretirement benefit plan assets using a financial model to project the expected return on each current investment portfolio. The analysis projects an expected rate of return on each of the different asset classes in order to arrive at the expected return on the entire portfolio relying on each trust's target asset allocation and reasonable capital market assumptions. The financial model is based on four key inputs: anticipated returns by asset class (based in part on historical returns), each trust's target asset allocation, an anticipated inflation rate, and the projected impact of a periodic rebalancing of each trust's portfolio. The Registrants set the expected rate of return assumption using an arithmetic mean which represents the expected simple average return to be earned by the pension plan assets over any one year. The Registrants believe the use of the arithmetic mean is more compatible with the expected rate of return's function of estimating a single year's investment return.
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An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO for the Registrants at December 31, 2023 were as follows:
Initial Cost Trend RateUltimate Cost Trend RateYear That Ultimate Rate is Reached
Pre-657.00 %4.50 %2032
Post-65 medical5.50 4.50 2032
Post-65 prescription8.50 4.50 2032
Pension Plans
The total accumulated benefit obligation for the pension plans at December 31, 2023 and 2022 was as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
December 31, 2023$11,991 $2,746 $3,674 $546 $145 $808 
December 31, 202211,422 2,601 3,534 520 135 801 
An actuarial loss of $0.5 billion and $5.3an actuarial gain of $3.9 billion were recorded for the annual remeasurement of senior notes outstanding,the Southern Company system pension plans at December 31, 2023 and 2022, respectively, which included senior notesprimarily due within one year.
Other Long-Term Notes
In September 2017,to a decrease of 18 basis points and an increase of 216 basis points, respectively, in the Company amended its $60 million aggregate principal amount floatingoverall discount rate term loan to, among other things, increase the aggregate principal amount to $100 million and extend the maturity date from September 2017 to October 2018. The additional $40 million of proceeds were used to repay existing indebtednesscalculate the benefit obligation as a result of higher market interest rates.
Changes in the projected benefit obligations and for other general corporate purposes.
Atthe fair value of plan assets during the plan years ended December 31, 2017, outstanding term loans2023 and 2022 were included in securities due within one year.as follows:
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$12,602 $2,906 $3,851 $569 $163 $868 
Service cost275 64 68 11 6 24 
Interest cost626 145 191 28 8 42 
Benefits paid(744)(155)(224)(32)(6)(104)
Actuarial loss493 116 123 23 6 52 
Balance at end of year13,252 3,076 4,009 599 177 882 
Change in plan assets
Fair value of plan assets at beginning of year14,218 3,427 4,456 649 178 1,002 
Actual return on plan assets1,092 260 331 50 12 79 
Employer contributions52 11 9 2 2 3 
Benefits paid(744)(154)(225)(32)(7)(104)
Fair value of plan assets at end of year14,618 3,544 4,571 669 185 980 
Accrued asset$1,366 $468 $562 $70 $8 $98 
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2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$16,382 $3,806 $5,012 $743 $222 $1,134 
Service cost412 99 103 17 34 
Interest cost408 96 123 18 28 
Benefits paid(692)(144)(226)(30)(5)(75)
Actuarial gain(3,908)(951)(1,161)(179)(69)(253)
Balance at end of year12,602 2,906 3,851 569 163 868 
Change in plan assets
Fair value of plan assets at beginning of year17,225 4,141 5,415 786 213 1,241 
Actual loss on plan assets(2,376)(579)(753)(110)(31)(167)
Employer contributions61 20 
Benefits paid(692)(144)(226)(30)(5)(75)
Fair value of plan assets at end of year14,218 3,427 4,456 649 178 1,002 
Accrued asset$1,616 $521 $605 $80 $15 $134 
The outstanding term loans as ofprojected benefit obligations for the qualified and non-qualified pension plans at December 31, 2017 have a covenant that limits debt levels to 65% of total capitalization, as defined2023 are shown in the agreements. For purposesfollowing table. All pension plan assets are related to the qualified pension plan.
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Projected benefit obligations:
Qualified pension plan$12,540 $2,959 $3,865 $569 $154 $822 
Non-qualified pension plan713 117 145 29 22 60 
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Amounts recognized in the balance sheets at December 31, 2023 and 2022 related to the Registrants' pension plans consist of the company to the extent such debt is non-recourse to the company,following:
Southern
Company
Alabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
December 31, 2023:
Prepaid pension costs(a)
$2,079 $585 $706 $99 $31 $158 
Other regulatory assets, deferred(b)
2,960 821 1,051 152  143 
Other current liabilities(64)(11)(13)(2)(2)(3)
Employee benefit obligations(c)
(649)(106)(131)(27)(21)(58)
Other regulatory liabilities, deferred(47)     
AOCI79    20 (45)
December 31, 2022:
Prepaid pension costs(a)
$2,290 $629 $738 $108 $37 $183 
Other regulatory assets, deferred(b)
2,455 679 887 123 — 111 
Other current liabilities(56)(10)(12)(2)(2)(3)
Employee benefit obligations(c)
(618)(98)(121)(26)(20)(42)
Other regulatory liabilities, deferred(85)  — — — 
AOCI24   — 11 (75)
(a)Included in prepaid pension and capitalization excludes the capital stock or other equity attributable to such subsidiary.
At December 31, 2017, the Company was in compliance with its debt limits.
Bank Credit Arrangements
Company Credit Facilities
At December 31, 2017, the Company had a committed credit facility (Facility) of $750 million expiring in 2022, of which $22 million has been used for letters of creditpostretirement benefit costs on Alabama Power's balance sheet and $728 million remains unused. In May 2017, the Company amended the Facility, which, among other things, extended the maturity date from 2020 to 2022 and increased the Company's borrowing ability under the Facility to $750 million from $600 million. Proceeds from the Facility may be used for working capital and general corporate purposes as well as liquidity support for the Company's commercial paper program. As of December 31, 2016, $78 million was used for letters of credit and $522 million remained unused. The Facility does not contain a material adverse change clause at the time of borrowing. Subject to applicable market conditions, the Company expects to renew or replace the Facility, as needed, prior to expiration. In connection therewith, the Company may extend the maturity date and/or increase or decrease the lending commitment thereunder. The Company's subsidiaries are not parties to the Facility.
The Company is required to pay a commitment fee on the unused balance of the Facility. This fee is less than 1/4 of 1%. The Facility contains a covenant that limits the ratio of debt to capitalization (each as defined in the Facility) to a maximum of 65%. For purposes of this definition, debt excludes any project debt incurred by certain subsidiaries of the Company to the extent such debt is non-recourse to the Company, and capitalization excludes the capital stock or other equity attributable to such subsidiary. At December 31, 2017, the Company was in compliance with its debt limits.
The Company also has a $120 million continuing letter of credit facility expiring in 2019 for standby letters of credit. At December 31, 2017, $101 million has been used for letters of credit, primarily as credit support for PPA requirements, and $19 million remains unused. At December 31, 2016, the total amount available under this facility was $82 million. The Company's subsidiaries are not parties to this letter of credit facility.
In addition, at both December 31, 2017 and 2016, the Company has $113 million of cash collateral posted related to PPA requirements, which is included in other deferred charges and assets in theon Southern Power's consolidated balance sheets.sheet.
Commercial Paper Program(b)Amounts for Southern Company exclude regulatory assets of $173 million and $190 million at December 31, 2023 and 2022, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.
The Company's commercial paper program is used to finance acquisition(c)Included in other deferred credits and construction costs related to electric generating facilities and for general corporate purposes. The Company's subsidiariesliabilities on Southern Power's consolidated balance sheets.
Presented below are not parties to the commercial paper program. Commercial paper isamounts included in notes payable in the consolidated balance sheets as noted below:
 
Commercial Paper at the
End of the Period
 Amount Outstanding Weighted Average Interest Rate
 (in millions)  
December 31, 2017$105
 2.0%
December 31, 2016$
 N/A

NOTES (continued)
Southern Power Companyregulatory assets at December 31, 2023 and Subsidiary Companies 2017 Annual Report

Subsidiary Project Credit Facilities
In connection with the construction of solar facilities by RE Tranquillity LLC, RE Garland Holdings LLC, and RE Roserock LLC, indirect subsidiaries of the Company, each subsidiary had entered into separate credit agreements (Project Credit Facilities), which were non-recourse to the Company (other than the subsidiary party to the agreement). Each Project Credit Facility provided (a) a senior secured construction loan credit facility, (b) a senior secured bridge loan facility, and (c) a senior secured letter of credit facility that was secured by the membership interests of the respective project company, with proceeds directed to finance project costs2022 related to the respective solar facilities. Each Project Credit Facility was secured by the assetsportion of the applicable project subsidiary and membership interests of the applicable project subsidiary. The Tranquillity and Garland Project Credit Facilities were fully repaid on October 14, 2016 and December 29, 2016, respectively. The table below summarizes the Roserock Project Credit Facility as of December 31, 2016, which was extended to January 31, 2017 and fully repaid on January 17, 2017.
   Construction Loan Facility Bridge Loan Facility Total Loan Facility Loan Facility Undrawn Letter of Credit Facility Letter of Credit Facility Undrawn
   (in millions)
December 31, 2016  $63
 $180
 $243
 $34
 $23
 $16
The Project Credit Facilities had no amount outstanding at December 31, 2017 and $209 million outstanding with a weighted average interest rate of 2.1% as of December 31, 2016.
Assets Subject to Lien
Under the terms of the PPA and the expansion PPA for the Mankato project, approximately $442 million of assets, primarily related to property, plant, and equipment, are subject to lien at December 31, 2017. See Note 11 for additional information.
Roserock is in a litigation dispute with McCarthy regarding damage to certain solar panels during installation. In connection therewith, Roserock is withholding payments of approximately $26 million from McCarthy, and McCarthy has filed mechanic's liens on the Roserock facility for the same amount. See Note 3 for additional information.
Dividend Restrictions
The Company can only pay dividendsdefined benefit pension plan attributable to Southern Company, out of retained earnings or paid-in-capital.
7. COMMITMENTS
Fuel Agreements
SCS, as agent for the Company and the traditional electric operating companies, has entered into various fuel transportation and procurement agreementsSouthern Company Gas that had not yet been recognized in net periodic pension cost.
Southern
Company
Alabama PowerGeorgia
Power
Mississippi PowerSouthern Company Gas
(in millions)
Balance at December 31, 2023
Regulatory assets:
Prior service cost$9 $4 $6 $1 $(7)
Net loss2,904 817 1,045 151 100 
Regulatory amortization    50 
Total regulatory assets(*)
$2,913 $821 $1,051 $152 $143 
Balance at December 31, 2022
Regulatory assets:
Prior service cost$10 $$$$(9)
Net loss2,361 675 880 122 66 
Regulatory amortization— — — — 54 
Total regulatory assets(*)
$2,371 $679 $887 $123 $111 
(*)Amounts for Southern Company exclude regulatory assets of $173 million and $190 million at December 31, 2023 and 2022, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to supply aits acquisition by Southern Company.
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The changes in the balance of regulatory assets related to the portion of the fuel (primarily natural gas) requirementsdefined benefit pension plan attributable to Southern Company, the traditional electric operating companies, and Southern Company Gas for the Company's generating facilities.years ended December 31, 2023 and 2022 are presented in the following table:
Southern
Company
Alabama PowerGeorgia
Power
Mississippi PowerSouthern Company Gas
(in millions)
Regulatory assets (liabilities):(*)
Balance at December 31, 2021$2,801 $809 $971 $146 $91 
Net (gain) loss(183)(67)(9)(12)27 
Reclassification adjustments:
Amortization of prior service costs(1)(1)(1)— 
Amortization of net gain (loss)(246)(62)(74)(11)
Amortization of regulatory assets(*)
— — — — (10)
Total reclassification adjustments(247)(63)(75)(11)(7)
Total change(430)(130)(84)(23)20 
Balance at December 31, 2022$2,371 $679 $887 $123 $111 
Net loss576 153 178 31 34 
Reclassification adjustments:
Amortization of prior service costs(1)(1)(1) 2 
Amortization of net loss(33)(10)(13)(2) 
Amortization of regulatory assets(*)
    (4)
Total reclassification adjustments(34)(11)(14)(2)(2)
Total change542 142 164 29 32 
Balance at December 31, 2023$2,913 $821 $1,051 $152 $143 
(*)Amounts for Southern Company exclude regulatory assets of $173 million and $190 million at December 31, 2023 and 2022, respectively, associated with unamortized amounts in Southern Company Gas' pension plans prior to its acquisition by Southern Company.
Presented below are the amounts included in AOCI at December 31, 2023 and 2022 related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic pension cost.
Southern
Company
Southern
Power
Southern Company
Gas
(in millions)
Balance at December 31, 2023
AOCI:
Prior service cost$(1)$ $(2)
Net (gain) loss80 20 (43)
Total AOCI$79 $20 $(45)
Balance at December 31, 2022
AOCI:
Prior service cost$(2)$— $(3)
Net (gain) loss26 11 (72)
Total AOCI$24 $11 $(75)
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The components of OCI related to the portion of the defined benefit pension plan attributable to Southern Company, Southern Power, and Southern Company Gas for the years ended December 31, 2023 and 2022 are presented in the following table:
Southern CompanySouthern
Power
Southern Company
Gas
(in millions)
AOCI:
Balance at December 31, 2021$100 $35 $(45)
Net gain(82)(22)(30)
Reclassification adjustments:
Amortization of net gain (loss)(2)— 
Total change(76)(24)(30)
Balance at December 31, 2022$24 $11 $(75)
Net loss62 9 29 
Reclassification adjustments:
Amortization of prior service costs1  1 
Amortization of net loss(8)  
Total reclassification adjustments(7) 1 
Total change55 9 30 
Balance at December 31, 2023$79 $20 $(45)
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Components of net periodic pension cost for the Registrants were as follows:
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Service cost$275 $64 $68 $11 $6 $24 
Interest cost626 145 191 28 8 42 
Expected return on plan assets(1,229)(297)(385)(56)(15)(85)
Recognized net (gain) loss32 9 13 2  (5)
Net amortization 1 1   15 
Prior service cost— — — — — (3)
Net periodic pension cost (income)$(296)$(78)$(112)$(15)$(1)$(12)
2022
Service cost$412 $99 $103 $17 $$34 
Interest cost408 96 123 18 28 
Expected return on plan assets(1,265)(306)(399)(57)(15)(91)
Recognized net loss240 62 75 11 
Net amortization— — — 15 
Prior service cost— — — — — (3)
Net periodic pension cost (income)$(205)$(48)$(97)$(11)$$(9)
2021
Service cost$434 $102 $112 $18 $10 $37 
Interest cost346 82 104 16 24 
Expected return on plan assets(1,191)(287)(375)(55)(14)(86)
Recognized net loss314 82 100 15 13 
Net amortization— — 15 
Prior service cost— — — — — (3)
Net periodic pension cost (income)$(96)$(20)$(58)$(6)$$— 
The service cost component of net periodic pension cost is included in operations and maintenance expenses and all other components of net periodic pension cost are included in other income (expense), net in the Registrants' statements of income.
Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets. In determining the market-related value of plan assets, the Registrants have elected to amortize changes in the market value of return-seeking plan assets over five years and to recognize the changes in the market value of liability-hedging plan assets immediately. Given the significant concentration in return-seeking plan assets, the accounting value of plan assets that is used to calculate the expected return on plan assets differs from the current fair value of the plan assets.
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Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2023, estimated benefit payments were as follows:
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Benefit Payments:
2024$748 $164 $241 $33 $$57 
2025776 171 248 34 59 
2026801 177 254 36 60 
2027822 182 257 37 62 
2028840 187 260 38 64 
2029 to 20334,417 988 1,337 201 47 336 
Other Postretirement Benefits
Changes in the APBO and the fair value of the Registrants' plan assets during the plan years ended December 31, 2023 and 2022 were as follows:
2023
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$1,441 $344 $514 $59 $9 $179 
Service cost15 4 4 1  1 
Interest cost70 17 25 3  9 
Benefits paid(107)(24)(36)(4)(1)(18)
Actuarial (gain) loss(33)(12)(18)(2)1 1 
Balance at end of year1,386 329 489 57 9 172 
Change in plan assets
Fair value of plan assets at beginning of year998 372 368 24  113 
Actual return on plan assets131 52 51 2  19 
Employer contributions73 3 27 3 1 14 
Benefits paid(107)(24)(36)(4)(1)(18)
Fair value of plan assets at end of year1,095 403 410 25  128 
Accrued asset (liability)$(291)$74 $(79)$(32)$(9)$(44)
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2022
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Change in benefit obligation
Benefit obligation at beginning of year$1,849 $440 $656 $76 $11 $237 
Service cost23 — 
Interest cost42 10 15 — 
Benefits paid(109)(23)(38)(4)(1)(18)
Actuarial gain(365)(89)(125)(16)(1)(46)
Retiree drug subsidy— — — — — 
Balance at end of year1,441 344 514 59 179 
Change in plan assets
Fair value of plan assets at beginning of year1,251 489 450 29 — 143 
Actual loss on plan assets(218)(98)(71)(4)— (25)
Employer contributions73 27 13 
Benefits paid(108)(23)(38)(4)(1)(18)
Fair value of plan assets at end of year998 372 368 24 — 113 
Accrued asset (liability)$(443)$28 $(146)$(35)$(9)$(66)
Amounts recognized in the balance sheets at December 31, 2023 and 2022 related to the Registrants' other postretirement benefit plans consist of the following:
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern
Power
Southern Company Gas
(in millions)
December 31, 2023:
Prepaid other postretirement benefit costs(a)
$ $74 $ $ $ $ 
Other regulatory assets, deferred(b)
23  11    
Other current liabilities(6)   (1) 
Employee benefit obligations(c)
(285) (79)(32)(8)(44)
Other regulatory liabilities, deferred(231)(48)(85)(10) (68)
AOCI(9)   1 (10)
December 31, 2022:
Prepaid other postretirement benefit costs(a)
$— $28 $— $— $— $— 
Other regulatory assets, deferred(b)
34 — 19 — — — 
Other current liabilities(6)— — — (1)— 
Employee benefit obligations(c)
(437)— (146)(35)(8)(66)
Other regulatory liabilities, deferred(170)(21)(58)(9)— (58)
AOCI(4)— — — — (2)
(a)Included in prepaid pension and other postretirement benefit costs on Alabama Power's balance sheet.
(b)Amounts for Southern Company exclude regulatory assets of $24 million and $32 million at December 31, 2023 and 2022, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
(c)Included in other deferred credits and liabilities on Southern Power's consolidated balance sheets.
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Presented below are the amounts included in net regulatory assets (liabilities) at December 31, 2023 and 2022 related to the other postretirement benefit plans of Southern Company, the traditional electric operating companies, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost.
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern Company Gas
(in millions)
Balance at December 31, 2023:
Regulatory assets (liabilities):
Prior service cost$13 $4 $5 $1 $ 
Net gain(216)(52)(79)(11)(64)
Regulatory amortization    (4)
Total regulatory assets (liabilities)(*)
$(203)$(48)$(74)$(10)$(68)
Balance at December 31, 2022:
Regulatory assets (liabilities):
Prior service cost$14 $$$$
Net gain(150)(25)(45)(10)(64)
Regulatory amortization— — — — 
Total regulatory assets (liabilities)(*)
$(136)$(21)$(39)$(9)$(58)
(*)Amounts for Southern Company exclude regulatory assets of $24 million and $32 million at December 31, 2023 and 2022, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
The changes in the balance of net regulatory assets (liabilities) related to the other postretirement benefit plans for the plan years ended December 31, 2023 and 2022 are presented in the following table:
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern Company Gas
(in millions)
Net regulatory assets (liabilities):(*)
Balance at December 31, 2021$(74)$(62)$(10)$$(34)
Net (gain) loss(64)41 (27)(10)(13)
Reclassification adjustments:
Amortization of prior service costs— — — — 
Amortization of net gain (loss)— (2)— — 
Amortization of regulatory assets(*)
— — — — (11)
Total reclassification adjustments— (2)— (11)
Total change(62)41 (29)(10)(24)
Balance at December 31, 2022$(136)$(21)$(39)$(9)$(58)
Net gain(77)(30)(38)(1)— 
Reclassification adjustments:
Amortization of prior service costs(1)— (1)— — 
Amortization of net gain— — 
Amortization of regulatory assets(*)
— — — — (10)
Total reclassification adjustments— (10)
Total change(72)(27)(35)(1)(10)
Balance at December 31, 2023$(208)$(48)$(74)$(10)$(68)
(*)Amounts for Southern Company exclude regulatory assets of $24 million and $32 million at December 31, 2023 and 2022, respectively, associated with unamortized amounts in Southern Company Gas' other postretirement benefit plans prior to its acquisition by Southern Company.
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Presented below are the amounts included in AOCI at December 31, 2023 and 2022 related to the other postretirement benefit plans of Southern Company, Southern Power, and Southern Company Gas that had not yet been recognized in net periodic other postretirement benefit cost.
Southern
Company
Southern
Power
Southern Company
Gas
(in millions)
Balance at December 31, 2023
AOCI:
Prior service cost$1 $ $ 
Net (gain) loss(10)1 (10)
Total AOCI$(9)$1 $(10)
Balance at December 31, 2022
AOCI:
Prior service cost$$— $— 
Net (gain) loss(5)— (2)
Total AOCI$(4)$— $(2)
The components of OCI related to the other postretirement benefit plans for the plan years ended December 31, 2023 and 2022 are presented in the following table:
Southern CompanySouthern
Power
Southern Company Gas
(in millions)
AOCI:
Balance at December 31, 2021$— $$(5)
Net gain(3)(2)— 
Reclassification adjustments:
Amortization of net gain (loss)(1)— 
Total change(4)(2)
Balance at December 31, 2022$(4)$— $(2)
Net (gain) loss(12)— 
Reclassification adjustments:
Amortization of net gain (loss)— (8)
Total change(5)(8)
Balance at December 31, 2023$(9)$$(10)
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Components of the other postretirement benefit plans' net periodic cost for the Registrants were as follows:
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
2023
Service cost$15 $4 $4 $1 $ $1 
Interest cost70 17 25 3  9 
Expected return on plan assets(83)(33)(29)(3)1 (10)
Net amortization(11)(3)(3)  6 
Net periodic postretirement benefit cost (income)$(9)$(15)$(3)$1 $1 $6 
2022
Service cost$23 $$$$— $
Interest cost42 10 15 — 
Expected return on plan assets(80)(32)(28)(2)(9)
Net amortization(1)— — — 
Net periodic postretirement benefit cost (income)$(16)$(16)$(5)$$$
2021
Service cost$24 $$$$— $
Interest cost35 12 — 
Expected return on plan assets(76)(30)(26)(1)(10)
Net amortization— — — 
Net periodic postretirement benefit cost (income)$(15)$(15)$(5)$$$
The service cost component of net periodic postretirement benefit cost is included in operations and maintenance expenses and all other components of net periodic postretirement benefit cost are included in other income (expense), net in the Registrants' statements of income.
The Registrants' future benefit payments, including prescription drug benefits, are provided in the table below. These purchase obligationsamounts reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans.
Southern CompanyAlabama PowerGeorgia
Power
Mississippi PowerSouthern PowerSouthern Company Gas
(in millions)
Benefit payments:
2024$111 $24 $40 $$$17 
2025109 24 39 17 
2026108 24 38 16 
2027108 24 38 16 
2028108 25 38 15 
2029 to 2033523 123 188 21 64 
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Benefit Plan Assets
Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code. The Registrants' investment policies for both the pension plans and the other postretirement benefit plans cover a diversified mix of assets as described below. Derivative instruments may be used to gain efficient exposure to the various asset classes and as hedging tools. Additionally, the Registrants minimize the risk of large losses primarily through diversification but also monitor and manage other aspects of risk.
The investment strategy for plan assets related to the Southern Company system's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities of the pension plan including, but not limited to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assets are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Southern Company system employs a formal rebalancing program. As additional risk management, external investment managers and service providers are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.
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Investment Strategies and Benefit Plan Asset Fair Values
A description of the major asset classes that the pension and other postretirement benefit plans are comprised of, along with the valuation methods used for fair value measurement, is provided below:
DescriptionValuation Methodology
Domestic equity: A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.

International equity: A mix of large and small capitalization growth and value stocks with developed and emerging markets exposure, managed both actively and through fundamental indexing approaches.
Domestic and international equities such as common stocks, American depositary receipts, and real estate investment trusts that trade on public exchanges are classified as Level 1 investments and are valued at the closing price in the active market. Equity funds with unpublished prices that are comprised of publicly traded securities (such as commingled/pooled funds) are also valued at the closing price in the active market, but are classified as Level 2.
Fixed income: A mix of domestic and international bonds.
Investments in fixed income securities, including fixed income pooled funds, are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Trust-owned life insurance (TOLI): Investments of taxable trusts aimed at minimizing the impact of taxes on the portfolio.
Investments in TOLI policies are classified as Level 2 investments and are valued based on the underlying investments held in the policy's separate accounts. The underlying assets are equity and fixed income pooled funds that are comprised of Level 1 and Level 2 securities.
Real estate: Investments in equity or debt of real properties and in publicly traded real estate securities.

Special situations: Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies, as well as investments in promising new strategies of a longer-term nature.

Private equity: Investments in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.

Private credit: Investments focused on debt instruments, of which returns are driven by income rather than capital appreciation.

Infrastructure: Investments in real assets, typically with long-term, predictable, and stable cash flows and a meaningful income component.
Investments in real estate, special situations, private equity, private credit, and infrastructure are typically invested in private partnerships and/or other pooled vehicles (Funds) which are generally classified as Net Asset Value as a Practical Expedient, since the Funds and underlying assets are not publicly traded and/or often have liquidity restrictions. The managers of the Funds value the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The total market value of each of the Funds is determined by aggregating the value of the underlying assets less liabilities.
For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate. The fair values presented herein exclude cash, receivables related to investment income and pending investment sales, and payables related to pending investment purchases.
The fair values, and actual allocations relative to the target allocations, of the Southern Company system's pension plans at December 31, 2023 and 2022 are presented below.
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Equity:41 %40 %
Domestic equity$1,959 $771 $— $— $2,730 
International equity1,947 1,052 — — 2,999 
Fixed income:30 32 
U.S. Treasury, government, and agency bonds— 1,973 — — 1,973 
Mortgage- and asset-backed securities— 44 — — 44 
Corporate bonds— 1,724 — — 1,724 
Pooled funds— 777 — — 777 
Cash equivalents and other371 58 — — 429 
Real estate investments369 — — 1,684 2,053 12 14 
Special situations— — — 245 245 
Private equity— — — 1,761 1,761 12 
Private credit— — — 25 25 — 
Infrastructure— — — — — — 
Total$4,646 $6,399 $— $3,715 $14,760 100 %100 %
Alabama Power
Assets:
Equity:41 %40 %
Domestic equity$476 $187 $— $— $663 
International equity472 255 — — 727 
Fixed income:30 32 
U.S. Treasury, government, and agency bonds— 479 — — 479 
Mortgage- and asset-backed securities— 11 — — 11 
Corporate bonds— 418 — — 418 
Pooled funds— 188 — — 188 
Cash equivalents and other90 14 — — 104 
Real estate investments89 — — 408 497 12 14 
Special situations— — — 59 59 
Private equity— — — 427 427 12 
Private credit— — — — 
Infrastructure— — — — — — 
Total$1,127 $1,552 $— $900 $3,579 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Georgia Power
Assets:
Equity:41 %40 %
Domestic equity$611 $241 $— $— $852 
International equity609 329 — — 938 
Fixed income:30 32 
U.S. Treasury, government, and agency bonds— 617 — — 617 
Mortgage- and asset-backed securities— 14 — — 14 
Corporate bonds— 539 — — 539 
Pooled funds— 243 — — 243 
Cash equivalents and other116 18 — — 134 
Real estate investments115 — — 527 642 12 14 
Special situations— — — 77 77 
Private equity— — — 551 551 12 
Private credit— — — — 
Infrastructure— — — — — — 
Total$1,451 $2,001 $— $1,163 $4,615 100 %100 %
Mississippi Power
Assets:
Equity:41 %40 %
Domestic equity$89 $35 $— $— $124 
International equity89 48 — — 137 
Fixed income:30 32 
U.S. Treasury, government, and agency bonds— 90 — — 90 
Mortgage- and asset-backed securities— — — 
Corporate bonds— 79 — — 79 
Pooled funds— 36 — — 36 
Cash equivalents and other17 — — 20 
Real estate investments17 — — 77 94 12 14 
Special situations— — — 11 11 
Private equity— — — 81 81 12 
Private credit— — — — 
Infrastructure— — — — — — 
Total$212 $293 $— $170 $675 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Power
Assets:
Equity:41 %40 %
Domestic equity$24 $10 $— $— $34 
International equity25 13 — — 38 
Fixed income:30 32 
U.S. Treasury, government, and agency bonds— 25 — — 25 
Mortgage- and asset-backed securities— — — 
Corporate bonds— 22 — — 22 
Pooled funds— 10 — — 10 
Cash equivalents and other— — 
Real estate investments— — 21 26 12 14 
Special situations— — — 
Private equity— — — 22 22 12 
Private credit— — — — — — 
Infrastructure— — — — — — 
Total$59 $82 $— $46 $187 100%100 %
Southern Company Gas
Assets:
Equity:41 %40 %
Domestic equity$130 $52 $— $— $182 
International equity130 71 — — 201 
Fixed income:30 32 
U.S. Treasury, government, and agency bonds— 132 — — 132 
Mortgage- and asset-backed securities— — — 
Corporate bonds— 116 — — 116 
Pooled funds— 52 — — 52 
Cash equivalents and other25 — — 29 
Real estate investments25 — — 113 138 12 14 
Special situations— — — 16 16 
Private equity— — — 118 118 12 
Private credit— — — — 
Infrastructure— — — — — — 
Total$310 $430 $— $249 $989 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Equity:45 %43 %
Domestic equity$2,078 $691 $— $— $2,769 
International equity2,166 1,090 — — 3,256 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 1,469 — — 1,469 
Mortgage- and asset-backed securities— 29 — — 29 
Corporate bonds— 1,494 — — 1,494 
Pooled funds— 607 — — 607 
Cash equivalents and other399 — — 406 
Real estate investments376 — — 1,887 2,263 13 15 
Special situations— — — 187 187 
Private equity— — — 1,717 1,717 12 
Total$5,019 $5,387 $— $3,791 $14,197 100 %100 %
Liabilities:
Derivatives(4)— — — (4)
Total$5,015 $5,387 $— $3,791 $14,193 100 %100 %
Alabama Power
Assets:
Equity:45 %43 %
Domestic equity$500 $167 $— $— $667 
International equity522 263 — — 785 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 354 — — 354 
Mortgage- and asset-backed securities— — — 
Corporate bonds— 360 — — 360 
Pooled funds— 146 — — 146 
Cash equivalents and other96 — — 98 
Real estate investments91 — — 455 546 13 15 
Special situations— — — 45 45 
Private equity— — — 414 414 12 
Total$1,209 $1,299 $— $914 $3,422 100 %100 %
Liabilities:
Derivatives(1)— — — (1)
Total$1,208 $1,299 $— $914 $3,421 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Georgia Power
Assets:
Equity:45 %43 %
Domestic equity$651 $217 $— $— $868 
International equity678 342 — — 1,020 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 460 — — 460 
Mortgage- and asset-backed securities— — — 
Corporate bonds— 468 — — 468 
Pooled funds— 190 — — 190 
Cash equivalents and other125 — — 127 
Real estate investments118 — — 591 709 13 15 
Special situations— — — 59 59 
Private equity— — — 538 538 12 
Total$1,572 $1,688 $— $1,188 $4,448 100 %100 %
Liabilities:
Derivatives(1)— — — (1)
Total$1,571 $1,688 $— $1,188 $4,447 100 %100 %
Mississippi Power
Assets:
Equity:45 %43 %
Domestic equity$95 $32 $— $— $127 
International equity99 50 — — 149 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 67 — — 67 
Mortgage- and asset-backed securities— — — 
Corporate bonds— 68 — — 68 
Pooled funds— 28 — — 28 
Cash equivalents and other18 — — — 18 
Real estate investments17 — — 86 103 13 15 
Special situations— — — 
Private equity— — — 78 78 12 
Total$229 $246 $— $173 $648 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Significant
Unobservable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Power
Assets:
Equity:45 %43 %
Domestic equity$25 $$— $— $34 
International equity27 14 — — 41 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 18 — — 18 
Corporate bonds— 19 — — 19 
Pooled funds— — — 
Cash equivalents and other— — — 
Real estate investments— — 24 29 13 15 
Special situations— — — 
Private equity— — — 21 21 12 
Total$62 $68 $— $47 $177 100 %100 %
Southern Company Gas
Assets:
Equity:45 %43 %
Domestic equity$146 $49 $— $— $195 
International equity152 77 — — 229 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 104 — — 104 
Mortgage- and asset-backed securities— — — 
Corporate bonds— 105 — — 105 
Pooled funds— 43 — — 43 
Cash equivalents and other28 — — 29 
Real estate investments27 — — 133 160 13 15 
Special situations— — — 13 13 
Private equity— — — 121 121 12 
Total$353 $381 $— $267 $1,001 100 %100 %
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The fair values, and actual allocations relative to the target allocations, of the applicable Registrants' other postretirement benefit plan assets at December 31, 2023 and 2022 are presented below.
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Net Asset Value as a Practical ExpedientTotalTarget AllocationActual Allocation
At December 31, 2023:(Level 1)(Level 2)(NAV)
(in millions)
Southern Company
Assets:
Equity:60 %61 %
Domestic equity$85 $87 $— $172 
International equity53 82 — 135 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 57 — 57 
Mortgage- and asset-backed securities— — 
Corporate bonds— 47 — 47 
Pooled funds— 92 — 92 
Cash equivalents and other21 — 23 
Trust-owned life insurance— 456 — 456 
Real estate investments11 — 46 57 
Special situations— — 
Private equity— — 48 48 
Private credit— — — 
Infrastructure— — — — — 
Total$170 $825 $101 $1,096 100 %100 %
Alabama Power
Assets:
Equity:67 %66 %
Domestic equity$16 $$— $22 
International equity16 — 25 
Fixed income:23 23 
U.S. Treasury, government, and agency bonds— 16 — 16 
Corporate bonds— 14 — 14 
Pooled funds— — 
Cash equivalents and other— — 
Trust-owned life insurance— 280 — 280 
Real estate investments— 14 17 
Special situations— — 
Private equity— — 15 15 
Private credit— — — — — 
Infrastructure— — — — — 
Total$38 $333 $31 $402 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Net Asset Value as a Practical ExpedientTotalTarget AllocationActual Allocation
At December 31, 2023:(Level 1)(Level 2)(NAV)
(in millions)
Georgia Power
Assets:
Equity:58 %57 %
Domestic equity$47 $$— $53 
International equity16 40 — 56 
Fixed income:35 35 
U.S. Treasury, government, and agency bonds— 16 — 16 
Corporate bonds— 14 — 14 
Pooled funds— 47 — 47 
Cash equivalents and other13 — — 13 
Trust-owned life insurance— 176 — 176 
Real estate investments— 14 18 
Special situations— — 
Private equity— — 14 14 
Private credit— — — — — 
Infrastructure— — — — — — 
Total$80 $299 $30 $409 100 %100 %
Mississippi Power
Assets:
Equity:34 %33 %
Domestic equity$$$— $
International equity— 
Fixed income:43 44 
U.S. Treasury, government, and agency bonds— — 
Corporate bonds— — 
Pooled funds— — 
Cash equivalents and other— — 
Real estate investments— 10 11 
Special situations— — — — 
Private equity— — 10 
Private credit— — — — — 
Infrastructure— — — — — 
Total$$12 $$24 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Net Asset Value as a Practical ExpedientTotalTarget AllocationActual Allocation
At December 31, 2023:(Level 1)(Level 2)(NAV)
(in millions)
Southern Company Gas
Assets:
Equity:72 %72 %
Domestic equity$$67 $— $69 
International equity22 — 24 
Fixed income:26 26 
U.S. Treasury, government, and agency bonds— — 
Corporate bonds— — 
Pooled funds— 29 — 29 
Cash equivalents and other— — 
Trust-owned life insurance— — — — 
Real estate investments— — 
Private equity— — 
Total$$120 $$127 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2022:(Level 1)(Level 2)(NAV)Total
(in millions)
Southern Company
Assets:
Equity:61 %59 %
Domestic equity$85 $74 $— $159 
International equity58 79 — 137 
Fixed income:30 28 
U.S. Treasury, government, and agency bonds— 43 — 43 
Mortgage- and asset-backed securities— — 
Corporate bonds— 40 — 40 
Pooled funds— 79 — 79 
Cash equivalents and other19 — — 19 
Trust-owned life insurance— 406 — 406 
Real estate investments11 — 51 62 
Special situations— — 
Private equity— — 46 46 
Total$173 $722 $103 $998 100 %100 %
Alabama Power
Assets:
Equity:69 %65 %
Domestic equity$17 $$— $23 
International equity18 — 27 
Fixed income:23 23 
U.S. Treasury, government, and agency bonds— 12 — 12 
Corporate bonds— 12 — 12 
Pooled funds— — 
Cash equivalents and other— — 
Trust-owned life insurance— 252 — 252 
Real estate investments— 16 19 
Special situations— — 
Private equity— — 14 14 
Total$41 $298 $32 $371 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2022:(Level 1)(Level 2)(NAV)Total
(in millions)
Georgia Power
Assets:
Equity:58 %56 %
Domestic equity$46 $$— $52 
International equity17 39 — 56 
Fixed income:35 34 
U.S. Treasury, government, and agency bonds— 10 — 10 
Corporate bonds— 12 — 12 
Pooled funds— 40 — 40 
Cash equivalents and other— — 
Trust-owned life insurance— 154 — 154 
Real estate investments— 15 19 
Special situations— — 
Private equity— — 14 14 
Total$76 $261 $31 $368 100 %100 %
Mississippi Power
Assets:
Equity:37 %35 %
Domestic equity$$$— $
International equity— 
Fixed income:43 41 
U.S. Treasury, government, and agency bonds— — 
Corporate bonds— — 
Pooled funds— — 
Cash equivalents and other— — 
Real estate investments— 11 12 
Special situations— — — — 
Private equity— — 10 
Total$$10 $$24 100 %100 %
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant
Other
Observable
Inputs
Net Asset Value as a Practical ExpedientTarget AllocationActual Allocation
At December 31, 2022:(Level 1)(Level 2)(NAV)Total
(in millions)
Southern Company Gas
Assets:
Equity:72 %70 %
Domestic equity$$56 $— $58 
International equity20 — 22 
Fixed income:26 27 
U.S. Treasury, government, and agency bonds— — 
Corporate bonds— — 
Pooled funds— 27 — 27 
Cash equivalents and other— — 
Real estate investments— — 
Private equity— — 
Total$$105 $$113 100 %100 %
Employee Savings Plan
Southern Company and its subsidiaries also sponsor 401(k) defined contribution plans covering substantially all employees and provide matching contributions up to specified percentages of an employee's eligible pay. Total matching contributions made to the plans for 2023, 2022, and 2021 were as follows:
Southern CompanyAlabama
Power
Georgia
Power
Mississippi
Power
Southern
Power
Southern Company Gas
(in millions)
2023$131 $28 $31 $$$18 
2022124 26 29 17 
2021119 26 28 16 
12. STOCK COMPENSATION
Stock-based compensation primarily in the form of Southern Company performance share units (PSU) and restricted stock units (RSU) may be granted through the Equity and Incentive Compensation Plan to Southern Company system employees ranging from line management to executives.
At December 31, 2023, the number of current and former employees participating in stock-based compensation programs for the Registrants was as follows:
Southern CompanyAlabama PowerGeorgia PowerMississippi PowerSouthern PowerSouthern Company Gas
Number of employees1,401 191 210 42 40 193 
The majority of PSUs and RSUs awarded contain terms where employees become immediately vested in PSUs and RSUs upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately, while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. In addition, the Registrants recognize forfeitures as they occur.
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All unvested PSUs and RSUs vest immediately upon a change in control where Southern Company is not the surviving corporation.
Performance Share Units
PSUs granted to employees vest at the end of a three-year performance period. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of PSUs granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company has issued two types of PSUs, each with a unique performance goal. These types of PSUs include total shareholder return (TSR) awards based on the TSR for Southern Company common stock during the three-year performance period as compared to a group of industry peers and ROE awards based on Southern Company's consolidated balance sheets. equity-weighted return over the performance period.
The fair value of TSR awards is determined as of the grant date using a Monte Carlo simulation model. In determining the fair value of the TSR awards issued to employees, the expected volatility is based on the historical volatility of Southern Company's stock over a period equal to the performance period. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant that covers the performance period of the awards. The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of TSR awards granted:
Year Ended December 31202320222021
Expected volatility30.0%29.6%30.0%
Expected term (in years)
333
Interest rate3.8%1.7%0.2%
Weighted average grant-date fair value$76.83$79.69$69.06
The Registrants recognize TSR award compensation expense on a straight-line basis over the three-year performance period without remeasurement.
The fair values of ROE awards are based on the closing stock price of Southern Company incurred fuelcommon stock on the date of the grant. The weighted average grant-date fair value of the ROE awards granted during 2023, 2022, and 2021 was $68.93, $66.87, and $59.49, respectively. Compensation expense for ROE awards is generally recognized ratably over the three-year performance period adjusted for expected changes in ROE performance. Total compensation cost recognized for vested ROE awards reflects final performance metrics.
Southern Company had 2.4 million unvested PSUs outstanding at December 31, 2022. In February 2023, the PSUs that vested for the three-year performance period ended December 31, 2022 were converted into 1.8 million shares outstanding at a share price of $621$67.13. During 2023, Southern Company granted 1.3 million $456PSUs and 1.3 million PSUs were vested or forfeited, resulting in 2.4 million unvested PSUs outstanding at December 31, 2023. In February 2024, the PSUs that vested for the three-year performance period ended December 31, 2023 were converted into 2.3 million shares outstanding at a weighted average share price of $66.95.
Total PSU compensation cost, and the related tax benefit recognized in income, for the years ended December 31, 2023, 2022, and 2021 are as follows:
202320222021
(in millions)
Southern Company
Compensation cost recognized in income$107 $101 $112 
Tax benefit of compensation cost recognized in income28 26 29 
Southern Company Gas
Compensation cost recognized in income$14 $12 $17 
Tax benefit of compensation cost recognized in income4 
Total PSU compensation cost and the related tax benefit recognized in income were immaterial for all periods presented for all other Registrants. The compensation cost related to the grant of Southern Company PSUs to the employees of each Subsidiary Registrant is recognized in each Subsidiary Registrant's financial statements with a corresponding credit to equity representing a capital contribution from Southern Company.
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At December 31, 2023, Southern Company's total unrecognized compensation cost related to PSUs was $32 million and $441is expected to be recognized over a weighted-average period of approximately 19 months. The total unrecognized compensation cost related to PSUs at December 31, 2023 was immaterial for all other Registrants.
Restricted Stock Units
The fair value of RSUs is based on the closing stock price of Southern Company common stock on the date of the grant. The weighted average grant-date fair values of RSUs granted during 2023, 2022, and 2021 were $68.95, $67.20, and $59.56, respectively. For most RSU awards, one-third of the RSUs vest each year throughout a three-year service period and compensation cost for RSUs is generally recognized over the corresponding one-, two-, or three-year vesting period. Shares of Southern Company common stock are delivered to employees at the end of each vesting period.
Southern Company had 0.9 million RSUs outstanding at December 31, 2022. During 2023, Southern Company granted 0.5 million RSUs and 0.5 million RSUs were vested or forfeited, resulting in 0.9 million unvested RSUs outstanding at December 31, 2023, including RSUs related to employee retention agreements.
For the years ended December 31, 2023, 2022, and 2021, Southern Company's total compensation cost for RSUs recognized in income was $30 million, $26 million, and $32 million, respectively. The related tax benefit also recognized in income was $8 million, $7 million, and $8 million for the years ended December 31, 2017, 2016,2023, 2022, and 2015, respectively, the majority2021, respectively. Total unrecognized compensation cost related to RSUs at December 31, 2023, which is being recognized over a weighted-average period of which was purchased under long-term commitments. The Company expects that a substantial amount of its future fuel needs will continue to be purchased under long-term commitments.approximately 17 months, is immaterial for Southern Company.
SCS may enter into various types of wholesale energyTotal RSUs outstanding and natural gas contracts acting as an agenttotal compensation cost and related tax benefit for the Company and Southern Company's traditional electric operating companies. Under these agreements, each of the traditional electric operating companies and the Company may be jointly and severally liable. Southern Company has entered into keep-well agreements with each of the traditional electric operating companies to ensure they will not subsidize or be responsible for any costs, losses, liabilities, or damages resulting from the inclusion of the Company as a contracting party under these agreements.
Operating Leases
The Company has operating lease agreements with various terms and expiration dates. Total rent expense was $29 million, $22 million, and $7 millionRSUs recognized in income for the years ended December 31, 2017, 2016,2023, 2022, and 2015, respectively. These amounts include contingent rent expense2021, as well as the total unrecognized compensation cost at December 31, 2023, were immaterial for all other Registrants. The compensation cost related to land leases based on wind production and escalationthe grant of Southern Company RSUs to the employees of each Subsidiary Registrant is recognized in the Consumer Price Index for All Urban Consumers. Thesuch Subsidiary Registrant's financial statements with a corresponding credit to equity representing a capital contribution from Southern Company.
Stock Options
In 2015, Southern Company excludes contingent rent but includes step rents, fixed escalations, lease concessions, and lease extensions in its computation of minimum lease payments, which are recognized on a straight-line basis over the minimum lease term.discontinued granting stock options. As of December 31, 2017, estimated minimum lease paymentsall stock option awards were vested and compensation cost fully recognized. Stock options expire no later than 10 years after the grant date and the latest possible exercise will occur by November 2024. At December 31, 2023, the weighted average remaining contractual term for the options outstanding and exercisable was approximately 2 months.
Southern Company's activity in the stock option program for 2023 is summarized below:
Shares Subject to OptionWeighted Average Exercise Price
(in millions)
Outstanding at December 31, 20221.0 $42.22 
Exercised0.7 42.54 
Outstanding and Exercisable at December 31, 20230.3 $41.58 
Southern Company's cash receipts from issuances related to stock options exercised under operating leases were $22 million in each of 2018, 2019, and 2020, $23 million in each of 2021 andthe share-based payment arrangements for the years ended December 31, 2023, 2022, and $8152021 were $28 million, in$75 million, and $66 million, respectively.
At December 31, 2023, the aggregate intrinsic value for options outstanding and thereafter. The majorityexercisable was immaterial for all Registrants.
Total intrinsic value of options exercised, and the committed future expendituresrelated tax benefit, for the years ended December 31, 2023, 2022, and 2021 are related to land leasespresented below for solarSouthern Company and wind facilities.were immaterial for all other Registrants:
Year Ended December 31202320222021
(in millions)
Southern Company
Intrinsic value of options exercised$18 $49 $34 
Tax benefit of options exercised4 12 
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COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Southern Power Company and Subsidiary Companies 2017 Annual Report

Redeemable Noncontrolling Interests
See Note 10.
8.13. FAIR VALUE MEASUREMENTS
Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement.
Level 1 consists of observable market data in an active market for identical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.
Level 3 consists of unobservable market data. The input may reflect the assumptions of the Companyeach Registrant of what a market participant would use in pricing an asset or liability. If there is little available market data, then the Company'seach Registrant's own assumptions are the best available information.
In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value measurement represents the level in the fair value hierarchy in which the fair value measurement is reported.
AsNet asset value as a practical expedient is the classification used for assets that do not have readily determined fair values. Fund managers value the assets using various inputs and techniques depending on the nature of the underlying investments.

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COMBINED NOTES TO FINANCIAL STATEMENTS

At December 31, 2017,2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Energy-related derivatives(a)
$$49 $— $— $55 
Investments in trusts:(b)
Domestic equity764 216 — — 980 
Foreign equity145 171 — — 316 
U.S. Treasury and government agency securities— 369 — — 369 
Municipal bonds— 48 — — 48 
Pooled funds – fixed income— — — 
Corporate bonds— 389 — — 389 
Mortgage and asset backed securities— 89 — — 89 
Private equity— — — 169 169 
Cash and cash equivalents— — — 
Other58 — 70 
Cash equivalents and restricted cash253 15 — — 268 
Other investments27 — 44 
Total$1,238 $1,382 $$178 $2,806 
Liabilities:
Energy-related derivatives(a)
$46 $312 $— $— $358 
Interest rate derivatives— 264 — — 264 
Foreign currency derivatives— 122 — — 122 
Contingent consideration— 16 — 19 
Other— 13 — — 13 
Total$49 $711 $16 $— $776 
II-232
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) Total
 (in millions)
Assets:       
Energy-related derivatives$
 $3
 $
 $3
Foreign currency derivatives
 129
 
 129
Cash equivalents21
 
 
 21
Total$21
 $132
 $
 $153
Liabilities:       
Energy-related derivatives$
 $13
 $
 $13
Foreign currency derivatives
 23
 
 23
Contingent consideration
 
 22
 22
Total$
 $36
 $22
 $58



COMBINED NOTES (continued)TO FINANCIAL STATEMENTS
Southern Power Company and Subsidiary Companies 2017 Annual Report

Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Alabama Power
Assets:
Energy-related derivatives$— $15 $— $— $15 
Nuclear decommissioning trusts:(b)
Domestic equity443 208 — — 651 
Foreign equity145 — — — 145 
U.S. Treasury and government agency securities— 20 — — 20 
Municipal bonds— — — 
Corporate bonds— 231 — — 231 
Mortgage and asset backed securities— 25 — — 25 
Private equity— — — 169 169 
Other— — 17 
Cash equivalents and restricted cash119 15 — — 134 
Other investments— 27 — — 27 
Total$715 $542 $— $178 $1,435 
Liabilities:
Energy-related derivatives$— $110 $— $— $110 
Georgia Power
Assets:
Energy-related derivatives$— $13 $— $— $13 
Nuclear decommissioning trusts:(b)
Domestic equity321 — — 322 
Foreign equity— 170 — — 170 
U.S. Treasury and government agency securities— 349 — — 349 
Municipal bonds— 47 — — 47 
Corporate bonds— 158 — — 158 
Mortgage and asset backed securities— 64 — — 64 
Other50 — — 53 
Total$371 $805 $— $— $1,176 
Liabilities:
Energy-related derivatives$— $124 $— $— $124 
As
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COMBINED NOTES TO FINANCIAL STATEMENTS

Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Mississippi Power
Assets:
Energy-related derivatives$— $15 $— $— $15 
Cash equivalents17 — — — 17 
Total$17 $15 $— $— $32 
Liabilities:
Energy-related derivatives$— $61 $— $— $61 
Southern Power
Assets:
Energy-related derivatives$— $$— $— $
Liabilities:
Energy-related derivatives$— $$— $— $
Foreign currency derivatives— 22 — — 22 
Contingent consideration— 16 — 19 
Other— 13 — — 13 
Total$$40 $16 $— $59 
Southern Company Gas
Assets:
Energy-related derivatives(a)
$$$— $— $
Non-qualified deferred compensation trusts:
Domestic equity— — — 
Foreign equity— — — 
Pooled funds - fixed income— — — 
Cash and cash equivalents— — — 
Total$$17 $— $— $26 
Liabilities:
Energy-related derivatives(a)(b)
$46 $12 $— $— $58 
Interest rate derivatives— 79 — — 79 
Total$46 $91 $— $— $137 
(a)Excludes cash collateral of $62 million.
(b)Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information.
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COMBINED NOTES TO FINANCIAL STATEMENTS

At December 31, 2016,2022, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Energy-related derivatives(a)
$18 $181 $— $— $199 
Interest rate derivatives— 12 — — 12 
Investments in trusts:(b)(c)
Domestic equity651 178 — — 829 
Foreign equity125 150 — — 275 
U.S. Treasury and government agency securities— 285 — — 285 
Municipal bonds— 51 — — 51 
Pooled funds – fixed income— — — 
Corporate bonds— 412 — — 412 
Mortgage and asset backed securities— 90 — — 90 
Private equity— — — 161 161 
Cash and cash equivalents— — — 
Other37 12 — — 49 
Cash equivalents1,427 20 — — 1,447 
Other investments26 — — 35 
Total$2,271 $1,424 $— $161 $3,856 
Liabilities:
Energy-related derivatives(a)
$32 $178 $— $— $210 
Interest rate derivatives— 302 — — 302 
Foreign currency derivatives— 216 — — 216 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$32 $709 $12 $— $753 
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COMBINED NOTES TO FINANCIAL STATEMENTS

Fair Value Measurements Using  
Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs  
As of December 31, 2016:(Level 1) (Level 2) (Level 3) Total
(in millions)
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets
Quoted Prices in Active Markets for Identical Assets
Quoted Prices in Active Markets for Identical Assets
At December 31, 2022:
At December 31, 2022:
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)(in millions)
Alabama Power
Assets:
Assets:
Assets:       
Energy-related derivatives$
 $21
 $
 $21
Interest rate derivatives
 1
 
 1
Energy-related derivatives
Energy-related derivatives
Nuclear decommissioning trusts:(b)
Domestic equity
Domestic equity
Domestic equity
Foreign equity
U.S. Treasury and government agency securities
Municipal bonds
Corporate bonds
Mortgage and asset backed securities
Private equity
Other
Cash equivalents
Other investments
Total
Liabilities:
Energy-related derivatives
Energy-related derivatives
Energy-related derivatives
Georgia Power
Georgia Power
Georgia Power
Assets:
Assets:
Assets:
Energy-related derivatives
Energy-related derivatives
Energy-related derivatives
Nuclear decommissioning trusts:(b)(c)
Nuclear decommissioning trusts:(b)(c)
Nuclear decommissioning trusts:(b)(c)
Domestic equity
Domestic equity
Domestic equity
Foreign equity
U.S. Treasury and government agency securities
Municipal bonds
Corporate bonds
Mortgage and asset backed securities
Other
Cash equivalents628
 
 
 628
Total$628
 $22
 $
 $650
Liabilities:       
Energy-related derivatives$
 $5
 $
 $5
Foreign currency derivatives
 58
 
 58
Contingent consideration
 
 18
 18
Total$
 $63
 $18
 $81
Energy-related derivatives
Energy-related derivatives
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Mississippi Power
Assets:
Energy-related derivatives$— $59 $— $— $59 
Cash equivalents47 — — — 47 
Total$47 $59 $— $— $106 
Liabilities:
Energy-related derivatives$— $32 $— $— $32 
Southern Power
Assets:
Energy-related derivatives$— $$— $— $
Liabilities:
Energy-related derivatives$— $12 $— $— $12 
Foreign currency derivatives— 47 — — 47 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$— $72 $12 $— $84 
Southern Company Gas
Assets:
Energy-related derivatives(a)
$18 $10 $— $— $28 
Non-qualified deferred compensation trusts:
Domestic equity— — — 
Foreign equity— — — 
Pooled funds - fixed income— — — 
Cash equivalents— — — 
Cash equivalents50 — — — 50 
Total$72 $26 $— $— $98 
Liabilities:
Energy-related derivatives(a)(b)
$32 $33 $— $— $65 
Interest rate derivatives— 86 — — 86 
Total$32 $119 $— $— $151 
(a)Excludes cash collateral of $41 million.
(b)Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information.
(c)Includes investment securities pledged to creditors and collateral received and excludes payables related to the securities lending program. See Note 6 under "Nuclear Decommissioning" for additional information.
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Valuation Methodologies
The energy-related derivatives primarily consist of exchange-traded and over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The fair value of cross-currency swaps reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future foreign currency exchange rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 914 for additional information on how these derivatives are used.
For fair value measurements of the investments within the nuclear decommissioning trusts and the non-qualified deferred compensation trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available.
The CompanyNRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. See Note 6 under "Nuclear Decommissioning" for additional information.
Southern Power has contingent payment obligations related to certaintwo of its acquisitions whereby the Companyit is primarily obligated to make generation-based payments to the seller, commencing at the commercial operation dateof each facility and continuing through 2026.2026 and 2035, respectively. The obligation isobligations are primarily categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facilityfacility's generation in MW-hours, as well as other inputs such as a fixed dollar amount per MW-hour, and a discount rate, and is evaluated periodically.rate. The fair value of contingent consideration reflects the net present value of expected payments and any periodic change arising from forecasted generation is expected to be immaterial.
Southern Power also has payment obligations through 2040 whereby it must reimburse the transmission owners for interconnection facilities and network upgrades constructed to support connection of a Southern Power generating facility to the transmission system. The obligations are categorized as Level 2 under Fair Value Measurements as the fair value is determined using observable inputs for the contracted amounts and reimbursement period, as well as a discount rate. The fair value of the obligations reflects the net present value of expected payments.
"Other investments" primarily includes investments traded in the open market that have maturities greater than 90 days, which are categorized as Level 2 under Fair Value Measurements and are comprised of corporate bonds, bank certificates of deposit, treasury bonds, and/or agency bonds.
The fair value measurements of private market investments held in Alabama Power's nuclear decommissioning trusts that are calculated at net asset value per share (or its equivalent) as a practical expedient totaled $178 million and $161 million at December 31, 2023 and 2022, respectively. Unfunded commitments related to the private market investments totaled $87 million and $78 million at December 31, 2023 and 2022, respectively. Private market investments include high-quality private equity funds across several market sectors, funds that invest in real estate assets, and a private credit fund. Private market funds do not have redemption rights. Distributions from these funds will be received as the underlying investments in the funds are liquidated.
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Southern Power Company and Subsidiary Companies 2017 Annual Report

As of At December 31, 20172023 and 2016,2022, other financial instruments for which the carrying amount did not equal fair value were as follows:
Southern
  Company(*)
Alabama PowerGeorgia PowerMississippi PowerSouthern Power
Southern Company
 Gas(*)
(in billions)
At December 31, 2023:
Long-term debt, including securities due within one year:
Carrying amount$59.4 $11.2 $16.5 $1.6 $2.7 $7.8 
Fair value55.0 10.1 15.1 1.4 2.6 6.8 
At December 31, 2022:
Long-term debt, including securities due within one year:
Carrying amount$54.6 $10.6 $14.7 $1.5 $3.0 $7.4 
Fair value48.6 9.2 13.0 1.3 2.8 6.5 
 
Carrying
Amount
 
Fair
Value
 (in millions)
Long-term debt, including securities due within one year:   
2017$5,841
 $6,079
2016$5,628
 $5,691
(*)The carrying amount of Southern Company Gas' long-term debt includes fair value adjustments from the effective date of the 2016 merger with Southern Company. Southern Company Gas amortizes the fair value adjustments over the remaining lives of the respective bonds, the latest being through 2043.
The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on the current rates available to the Company.Registrants.
9.14. DERIVATIVES
The Company isRegistrants are exposed to market risks, primarilyincluding commodity price risk, and interest rate risk, weather risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, the Companyeach company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company'seach company's policies in areas such as counterparty exposure and risk management practices. The Company'sFor the traditional electric operating companies, Southern Power, and Southern Company Gas' other businesses, each company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the consolidated balance sheets as either assets or liabilities and are presented on a net basis. See Note 813 for additional fair value information. In the statements of cash flows, theany cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities. TheAny cash impacts of settled foreign currency derivatives are classified as operating or financing activities to correspond with the classification of the hedged interest or principal, respectively. See Note 1 under "Financial Instruments" for additional information. See Note 15 under "Southern Company Gas" for additional information regarding the sale of Sequent.
Energy-Related Derivatives
The Company entersSubsidiary Registrants enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities have limited exposure to market volatility in energy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas distribution utilities of Southern Company Gas manage fuel-hedging programs, implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which are expected to continue to mitigate price volatility. The Company hastraditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because itstheir long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, the Company has beentraditional electric operating companies and Southern Power may continue to be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, be material and can adversely affect its results of operations.
Southern Company Gas also enters into weather derivative contracts as a resulteconomic hedges in the event of uncontracted generating capacity.warmer-than-normal weather. Exchange-traded options are carried at fair value, with changes reflected in operating revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are reflected in operating revenues.
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Energy-related derivative contracts are accounted for under one of twothree methods:
Regulatory Hedges – Energy-related derivative contracts designated as regulatory hedges relate primarily to the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through an approved cost recovery mechanism.
Cash Flow Hedges – Gains and losses on energy-related derivatives designated as cash flow hedges which(which are mainly used to hedge anticipated purchases and sales andsales) are initially deferred in OCIAOCI before being recognized in the consolidated statements of income in the same period and in the same income statement line item as the earnings effect of the hedged transactions are reflected in earnings.
transactions.
Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the consolidated statements of income as incurred.
Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric industry.and natural gas industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.
At December 31, 2017,2023, the net volume of energy-related derivative contracts for natural gas positions, totaled 14together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows:
Net
Purchased
mmBtu
Longest
Hedge
Date
Longest
Non-Hedge
Date
(in millions)
Southern Company(*)
44820302028
Alabama Power1182026
Georgia Power1282026
Mississippi Power932028
Southern Power720302024
Southern Company Gas(*)
10220272028
(*)Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of long natural gas positions of 112 million mmBtu alland short natural gas positions of which expire in 2018. At10 million mmBtu at December 31, 2017, the net volume of energy-related derivative contracts for power positions was 3 million MWHs, all of2023, which expireis also included in 2018.Southern Company's total volume.
In addition to the volumevolumes discussed above, the Company enterstraditional electric operating companies and Southern Power enter into physical natural gas supply contracts that provide the option to sell back excess natural gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 1012 million mmBtu.mmBtu for Southern Company, which includes 3 million mmBtu for Alabama Power, 4 million mmBtu for Georgia Power, 2 million mmBtu for Mississippi Power, and 3 million mmBtu for Southern Power.
For cash flow hedges of energy-related derivatives, the estimated pre-tax gains (losses) expected to be reclassified from accumulated OCIAOCI to earnings for the 12-month periodyear ending December 31, 2018 is $(7) million.

NOTES (continued)
2024 are $(37) million for Southern Company, $(4) million for Southern Power, and $(33) million for Southern Company and Subsidiary Companies 2017 Annual Report

Gas.
Interest Rate Derivatives
TheSouthern Company and certain subsidiaries may also enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the effective portionderivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and presented on the same income statement line item as the earnings effect of the hedged transactions. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses is recorded in OCI and is reclassified into earnings at the same time the hedged transactions affect earnings. The derivatives employed as hedging instrumentsitems' fair value gains or losses are structured to minimize ineffectiveness, which isboth recorded directly to earnings.earnings on the same income statement line item. Fair value gains or losses on derivatives that are not designated or fail to qualify as hedges are recognized in the consolidated statements of income as incurred.
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At December 31, 2017,2023, the Company did not have anyfollowing interest rate derivatives outstanding and does not have any deferred gains and losses in AOCI related towere outstanding:
Notional
Amount
Weighted Average Interest Rate PaidInterest
Rate
Received
Hedge
Maturity
Date
Fair Value
Gain (Loss) December 31, 2023
(in millions)(in millions)
Cash Flow Hedges of Forecasted Debt
Georgia Power$150 4.01%N/AApril 2024$— 
Mississippi Power75 3.84%N/AJune 2024— 
Mississippi Power75 4.04%N/AJune 2024— 
Fair Value Hedges of Existing Debt
Southern Company parent400 1-month SOFR + 0.80%1.75%March 2028(46)
Southern Company parent1,000 1-month SOFR + 2.48%3.70%April 2030(139)
Southern Company Gas500 1-month SOFR + 0.49%1.75%January 2031(79)
Southern Company$2,200 $(264)
For cash flow hedges that wouldof interest rate derivatives, the estimated pre-tax losses expected to be reclassified from AOCI to interest expense.expense for the year ending December 31, 2024 are $19 million for Southern Company and immaterial for the traditional electric operating companies and Southern Company Gas. Deferred gains and losses related to interest rate derivatives are expected to be amortized into earnings through 2054 for Southern Company, Georgia Power, and Mississippi Power, 2052 for Alabama Power, and 2046 for Southern Company Gas.
Foreign Currency Derivatives
TheSouthern Company and certain subsidiaries, including Southern Power, may also enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or losses isare recorded in OCI and isare reclassified into earnings at the same time thatand on the same income statement line as the earnings effect of the hedged transactions, affect earnings, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Any ineffectiveness isDerivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings. The derivatives employedearnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Southern Company has elected to exclude the cross-currency basis spread from the assessment of effectiveness in the fair value hedges of its foreign currency risk and record any difference between the change in the fair value of the excluded components and the amounts recognized in earnings as hedging instruments are structured to minimize ineffectiveness.a component of OCI.
At December 31, 2017,2023, the following foreign currency derivatives were outstanding:
Pay NotionalPay RateReceive NotionalReceive RateHedge
Maturity Date
Fair Value
Gain (Loss) at December 31, 2017
(in millions) (in millions)  (in millions)
Pay NotionalPay NotionalPay RateReceive NotionalReceive RateHedge
Maturity Date
Fair Value
Gain (Loss) December 31, 2023
(in millions)(in millions)(in millions) (in millions)
Cash Flow Hedges of Existing DebtCash Flow Hedges of Existing Debt    

$677
2.95%600
1.00%June 2022$55

564
3.78%500
1.85%June 202651
Total$1,241
 1,100
 $106
Southern Power
Southern Power
Southern Power
Fair Value Hedges of Existing Debt
Southern Company parent
Southern Company parent
Southern Company parent
Southern Company
The estimated pre-tax gains (losses) related toFor cash flow hedges of foreign currency derivatives, that willthe estimated pre-tax losses expected to be reclassified from accumulated OCIAOCI to earnings for the next 12-month periodyear ending December 31, 2018 total $(23) million.2024 are $11 million for Southern Power.
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Derivative Financial Statement Presentation and Amounts
The Company entersRegistrants enter into energy-related and interest rate derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. FairSouthern Company and certain subsidiaries also utilize master netting agreements to mitigate exposure to counterparty credit risk. These agreements may contain provisions that permit netting across product lines and against cash collateral. The fair value amounts of derivative assets and liabilities on the consolidated balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.
At December 31, 2017 and 2016, theThe fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected in the consolidated balance sheets is as follows:
20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Southern Company
Energy-related derivatives designated as hedging instruments for regulatory purposes
Assets from risk management activities/Liabilities from risk management activities$12 $198 $123 $121 
Other deferred charges and assets/Other deferred credits and liabilities31 117 52 44 
Total derivatives designated as hedging instruments for regulatory purposes43 315 175 165 
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Assets from risk management activities/Liabilities from risk management activities 29 27 
Other deferred charges and assets/Other deferred credits and liabilities3 4 
Interest rate derivatives:
Assets from risk management activities/Liabilities from risk management activities 74 12 62 
Other deferred charges and assets/Other deferred credits and liabilities 190 — 240 
Foreign currency derivatives:
Assets from risk management activities/Liabilities from risk management activities 34 — 34 
Other deferred charges and assets/Other deferred credits and liabilities 88 — 182 
Total derivatives designated as hedging instruments in cash flow and fair value hedges3 419 21 549 
Energy-related derivatives not designated as hedging instruments
Assets from risk management activities/Liabilities from risk management activities8 8 13 13 
Other deferred charges and assets/Other deferred credits and liabilities1 2 
Total derivatives not designated as hedging instruments9 10 15 14 
Gross amounts recognized55 744 211 728 
Gross amounts offset(a)
(23)(85)(70)(111)
Net amounts recognized in the Balance Sheets(b)
$32 $659 $141 $617 
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Southern Power Company and Subsidiary Companies 2017 Annual Report

20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Alabama Power(c)
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$6 $69 $42 $21 
Other deferred charges and assets/Other deferred credits and liabilities9 41 20 18 
Total derivatives designated as hedging instruments for regulatory purposes15 110 62 39 
Gross amounts offset(10)(10)(24)(24)
Net amounts recognized in the Balance Sheets$5 $100 $38 $15 
Georgia Power
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$2 $82 $36 $43 
Other deferred charges and assets/Other deferred credits and liabilities10 42 18 
Total derivatives designated as hedging instruments for regulatory purposes12 124 42 61 
Energy-related derivatives not designated as hedging instruments
Other deferred charges and assets/Other deferred credits and liabilities1   
Gross amounts recognized13 124 42 62 
Gross amounts offset(11)(11)(21)(21)
Net amounts recognized in the Balance Sheets$2 $113 $21 $41 
Mississippi Power(c)
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$3 $27 $33 $24 
Other deferred charges and assets/Other deferred credits and liabilities12 34 26 
Total derivatives designated as hedging instruments for regulatory purposes15 61 59 32 
Gross amounts offset(14)(14)(17)(17)
Net amounts recognized in the Balance Sheets$1 $47 $42 $15 
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 2017 2016
Derivative Category and Balance Sheet LocationAssetsLiabilities AssetsLiabilities
 (in millions)
Derivatives designated as hedging instruments in cash flow and fair value hedges     
Energy-related derivatives:     
Other current assets/Other current liabilities$3
$11
 $18
$4
Foreign currency derivatives:     
Other current assets/Other current liabilities
23
 
25
Other deferred charges and assets/Other deferred credits and liabilities129

 
33
Total derivatives designated as hedging instruments in cash flow and fair value hedges$132
$34
 $18
$62
Derivatives not designated as hedging instruments     
Energy-related derivatives:     
Other current assets/Other current liabilities$
$2
 $3
$1
Interest rate derivatives:     
Other current assets/Other current liabilities

 1

Total derivatives not designated as hedging instruments$
$2
 $4
$1
Gross amounts of recognized assets and liabilities$132
$36
 $22
$63
Gross amounts offset$(3)$(3) $(5)$(5)
Net amounts of assets and liabilities$129
$33
 $17
$58

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Southern Power Company and Subsidiary Companies 2017 Annual Report

20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Southern Power
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Other current assets/Other current liabilities$ $5 $— $12 
Other deferred charges and assets/Other deferred credits and liabilities3  — 
Foreign currency derivatives:
Other current assets/Other current liabilities 11 — 11 
Other deferred charges and assets/Other deferred credits and liabilities 11 — 36 
Total derivatives designated as hedging instruments in cash flow and fair value hedges3 27 59 
Energy-related derivatives not designated as hedging instruments
Other current assets/Other current liabilities  — 
Other deferred charges and assets/Other deferred credits and liabilities  — 
Total derivatives not designated as hedging instruments  — 
Net amounts recognized in the Balance Sheets$3 $27 $$59 
Southern Company Gas
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$1 $20 $12 $33 
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Other current assets/Other current liabilities 24 15 
Other deferred charges and assets/Other deferred credits and liabilities 4 
Interest rate derivatives:
Other current assets/Other current liabilities 20 — 14 
Other deferred charges and assets/Other deferred credits and liabilities 59 — 72 
Total derivatives designated as hedging instruments in cash flow and fair value hedges 107 105 
Energy-related derivatives not designated as hedging instruments
Other current assets/Other current liabilities7 8 11 12 
Other deferred charges and assets/Other deferred credits and liabilities1 2 
Total derivatives not designated as hedging instruments8 10 12 13 
Gross amounts recognized9 137 28 151 
Gross amounts offset(a)
12 (50)— (41)
Net amounts recognized in the Balance Sheets(b)
$21 $87 $28 $110 
(a)Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $62 million and $41 million at December 31, 2023 and 2022, respectively.
(b)Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
(c)Energy-related derivatives not designated as hedging instruments were immaterial at December 31, 2022. There were no such instruments at December 31, 2023.
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At December 31, 2023 and 2022, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows:
Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheets
Derivative Category and Balance Sheet
Location
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern Company Gas
 (in millions)
At December 31, 2023:
Energy-related derivatives:
Other regulatory assets, current$(180)$(67)$(80)$(25)$(8)
Other regulatory assets, deferred(87)(32)(33)(22)— 
Other regulatory liabilities, current— 
Other regulatory liabilities, deferred— — — 
Total energy-related derivative gains (losses)$(257)$(95)$(112)$(46)$(4)
At December 31, 2022:
Energy-related derivatives:
Other regulatory assets, current$(71)$(8)$(26)$(13)$(24)
Other regulatory assets, deferred(23)(7)(14)(2)— 
Other regulatory liabilities, current72 29 19 22 
Other regulatory liabilities, deferred31 20 — 
Total energy-related derivative gains (losses)$$23 $(19)$27 $(22)
For the years ended December 31, 2017, 2016,2023, 2022, and 2015,2021, the pre-tax effects of energy-related,cash flow and fair value hedge accounting on AOCI for the applicable Registrants were as follows:
Gain (Loss) From Derivatives Recognized in OCI202320222021
(in millions)
Southern Company
Cash flow hedges:
Energy-related derivatives$(81)$$34 
Interest rate derivatives(12)46 
Foreign currency derivatives14 (105)(103)
Fair value hedges(*):
Foreign currency derivatives21 (24)(3)
Total$(58)$(80)$(67)
Georgia Power
Cash flow hedges:
Interest rate derivatives$(2)$31 $— 
Southern Power
Cash flow hedges:
Energy-related derivatives$(18)$(15)$12 
Foreign currency derivatives14 (105)(103)
Total$(4)$(120)$(91)
Southern Company Gas
Cash flow hedges:
Energy-related derivatives$(63)$18 $22 
(*)Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI.
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The pre-tax effects of interest rate and foreign currency derivatives designated as cash flow hedging instruments on AOCI were immaterial for Alabama Power for all years presented and immaterial for Mississippi Power in 2023.
The pre-tax effects of cash flow and fair value hedge accounting on income for the consolidated statements of incomeyears ended December 31, 2023, 2022, and 2021 were as follows:
Location and Amount of Gain (Loss) Recognized in Income on Cash Flow and Fair Value Hedging Relationships202320222021
(in millions)
Southern Company
Total cost of natural gas$1,644 $3,004 $1,619 
Gain (loss) on energy-related cash flow hedges(a)
(44)37 17 
Total other operations and maintenance6,093 6,573 5,902 
Gain (loss) on energy-related cash flow hedges(a)
(2)  
Total depreciation and amortization4,525 3,663 3,565 
Gain (loss) on energy-related cash flow hedges(a)
(23)(5)
Total interest expense, net of amounts capitalized(2,446)(2,022)(1,837)
Gain (loss) on interest rate cash flow hedges(a)
(35)(25)(27)
Gain (loss) on foreign currency cash flow hedges(a)
(11)(19)(24)
Gain (loss) on interest rate fair value hedges(b)
37 (291)(30)
Total other income (expense), net553 500 449 
Gain (loss) on foreign currency cash flow hedges(a)(c)
19 (83)(104)
Gain (loss) on foreign currency fair value hedges69 (106)(63)
Amount excluded from effectiveness testing recognized in earnings(21)24 
Southern Power
Total depreciation and amortization$504 $516 $517 
Gain (loss) on energy-related cash flow hedges(a)
(23)(5)
Total interest expense, net of amounts capitalized(129)(138)(147)
Gain (loss) on foreign currency cash flow hedges(a)
(11)(19)(24)
Total other income (expense), net12 7 10 
Gain (loss) on foreign currency cash flow hedges(a)(c)
19 (83)(104)
Southern Company Gas
Total cost of natural gas$1,644 $3,004 $1,619 
Gain (loss) on energy-related cash flow hedges(a)
(44)37 17 
Total other operations and maintenance1,194 1,176 1,072 
Gain (loss) on energy-related cash flow hedges(a)
(2)  
Total interest expense, net of amounts capitalized(310)(263)(238)
Gain (loss) on interest rate cash flow hedges(a)
(19)(4)— 
Gain (loss) on interest rate fair value hedges(b)
(86)— 
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) Recognized in OCI on Derivative
(Effective Portion)
 
Gain (Loss) Reclassified from AOCI into Income
(Effective Portion)
Derivative Category201720162015 Statements of Income Location201720162015
 (in millions)  (in millions)
Energy-related derivatives$(38)$14
$
 Amortization$(17)$2
$
Interest rate derivatives


 Interest expense, net of amounts capitalized
(1)(1)
Foreign currency derivatives140
(58)
 Interest expense, net of amounts capitalized(23)(13)
     Other income (expense), net159
(82)
Total$102
$(44)$
  $119
$(94)$(1)
(a)Reclassified from AOCI into earnings.
There was(b)For fair value hedges, changes in the fair value of the derivative contracts are generally equal to changes in the fair value of the underlying debt and have no material ineffectivenessimpact on income.
(c)The reclassification from AOCI into other income (expense), net completely offsets currency gains and losses arising from changes in the U.S. currency exchange rates used to record the euro-denominated notes.
The pre-tax effects of cash flow hedge accounting on income for interest rate derivatives were immaterial for the traditional electric operating companies for all years presented.
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At December 31, 2023 and 2022, the following amounts were recorded in earningson the balance sheets related to cumulative basis adjustments for any period presented.fair value hedges:
Carrying Amount of
the Hedged Item
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item
Balance Sheet Location of Hedged ItemsAt December 31, 2023At December 31, 2022At December 31, 2023At December 31, 2022
(in millions)(in millions)
Southern Company
Long-term debt$(3,024)$(2,927)$235 $282 
Southern Company Gas
Long-term debt$(427)$(415)$70 $81 
The pre-tax effects of energy-related derivatives and interest rate derivatives not designated as hedging instruments on the Company's consolidated statements of income of Southern Company and Southern Company Gas for the years ended December 31, 2023, 2022, and 2021 were as follows:
Gain (Loss)
Derivatives in Non-Designated Hedging RelationshipsStatements of Income Location202320222021
(in millions)
Energy-related derivatives
Natural gas revenues(*)
$ $(11)$(117)
Cost of natural gas59 (65)(27)
Total derivatives in non-designated hedging relationships$59 $(76)$(144)
(*)    Excludes the impact of weather derivatives recorded in natural gas revenues of $15 million and $(7) million for 2023 and 2022, respectively, as they are accounted for based on intrinsic value rather than fair value. There was no weather derivatives impact for 2021.
The pre-tax effects of energy-related derivatives not materialdesignated as hedging instruments were immaterial for any yearall other Registrants for all years presented.
Contingent Features
The Company doesRegistrants do not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain affiliated companies.Southern Company subsidiaries. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. At December 31, 2017, there was2023, the Registrants had no collateral posted with the Company's derivative counterparties.counterparties to satisfy these arrangements.
At December 31, 2017,For Southern Company, the fair value of foreign currency derivative liabilities and interest rate derivative liabilities with contingent features, and the maximum potential collateral requirements arising from the credit-risk-related contingent features at a rating below BBB- and/or Baa3, was $8 million. However,$52 million at December 31, 2023. For Southern Power, the fair value of foreign currency derivative liabilities with contingent features, includingand the maximum potential collateral requirements arising from the credit-risk-related contingent features at a rating below BBB- and/or Baa3, was immaterial at December 31, 2023. For the traditional electric operating companies and Southern Power, energy-related derivative liabilities with contingent features and the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were immaterial at December 31, 2023. The maximum potential collateral requirements arising from the credit-risk-related contingent features for the traditional electric operating companies and Southern Power include certain agreements that could require collateral in the event that one or more Southern Company system power pool participants has a credit rating change to below investment grade because of jointgrade.
Alabama Power and several liability features underlying these derivatives, was $12 million at December 31, 2017.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. If collateral is required, fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty.
The Company maintainsPower maintain accounts with certain regional transmission organizations to facilitate financial derivative transactions and they may be required to post collateral based on the value of the positions in these accounts and the associated margin requirements. At December 31, 2023, cash collateral posted in these accounts was immaterial for Alabama Power and Southern Power. Southern Company Gas maintains accounts with brokers or the clearing houses of certain exchanges to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, theSouthern Company Gas may be required to post collateral.deposit cash into these accounts. At December 31, 2017,2023, cash collateral postedheld on deposit in broker margin accounts was immaterial.$62 million.
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The Company isRegistrants are exposed to losses related to financial instruments in the event of counterparties' nonperformance. The CompanyRegistrants only entersenter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Company hasRegistrants have also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company'stheir exposure to counterparty credit risk. Therefore,
Southern Company Gas uses established credit policies to determine and monitor the creditworthiness of counterparties, including requirements to post collateral or other credit security, as well as the quality of pledged collateral. Collateral or credit security is most often in the form of cash or letters of credit from an investment-grade financial institution, but may also include cash or U.S. government securities held by a trustee. Prior to entering a physical transaction, Southern Company doesGas assigns its counterparties an internal credit rating and credit limit based on the counterparties' Moody's, S&P, and Fitch ratings, commercially available credit reports, and audited financial statements. Southern Company Gas may require counterparties to pledge additional collateral when deemed necessary.
Southern Company Gas utilizes netting agreements whenever possible to mitigate exposure to counterparty credit risk. Netting agreements enable Southern Company Gas to net certain assets and liabilities by counterparty across product lines and against cash collateral, provided the netting and cash collateral agreements include such provisions. While the amounts due from, or owed to, counterparties are settled net, they are recorded on a gross basis on the balance sheet as energy marketing receivables and energy marketing payables.
The Registrants do not anticipate a material adverse effect on thetheir respective financial statements as a result of counterparty nonperformance.
10. NONCONTROLLING INTERESTS15. ACQUISITIONS AND DISPOSITIONS
None of the dispositions discussed herein, both individually and combined, represented a strategic shift in operations for the applicable Registrants that has, or is expected to have, a major effect on its operations and financial results; therefore, none of the assets related to the sales have been classified as discontinued operations for any of the periods presented.
Southern Company
In April 2017,October 2021, Southern Company completed the sale of a leveraged lease investment to the lessee for $45 million. No gain or loss was recognized on the sale; however, it did result in the recognition of approximately $114$16 million of additional tax benefits. Prior to the sale, in the second quarter 2021, a charge of $7 million ($6 million after tax) was recorded to reduce the investment to its estimated fair value, less costs to sell.
In December 2021, Southern Company completed the termination of its leasehold interest in assets associated with its two international leveraged lease projects and received cash proceeds of approximately $673 million after the accelerated exercise of the lessee's purchase options. The pre-tax gain associated with the transaction was approximately $93 million ($99 million gain after tax).
Alabama Power
In September 2022, Alabama Power completed its acquisition of the Calhoun Generating Station, which was accounted for as an asset acquisition. The total purchase price was $179 million, of which $171 million was reclassified from redeemable noncontrolling interestsrelated to non-redeemable noncontrolling interests due tonet assets recorded within property, plant, and equipment on the expiration of an option allowing SunPower Corporation to requirebalance sheet and reflected in property additions within the Company to purchase its redeemable noncontrolling interest at fair market value. In addition, Turner Renewable Energy, LLC owned a 10% redeemable noncontrolling interest in certaininvesting section of the Company's solar facilities. These noncontrolling interests were redeemed in October 2017 at fair market value pursuantstatement of cash flows. The remainder primarily related to the partnership agreement. As of December 31, 2017, there were no outstanding redeemable noncontrolling interests.fossil fuel stock and materials and supplies. See Note 2 under "Alabama Power – Rate CNP New Plant" for additional information.
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Southern Power Company and Subsidiary Companies 2017 Annual Report

The following table presents the changes in redeemable noncontrolling interestsSouthern Power's acquisition-related costs for the years ended December 31:
 2017 2016 2015
   (in millions)  
Beginning balance$164
 $43
 $39
Net income attributable to redeemable noncontrolling interests2
 4
 2
Distributions to redeemable noncontrolling interests(2) (1) 
Capital contributions from redeemable noncontrolling interests2
 118
 2
Redemption of redeemable noncontrolling interests(59) 
 
Reclassification to non-redeemable noncontrolling interests(114) 
 
Change in fair value of redeemable noncontrolling interests7
 
 
Ending balance$
 $164
 $43
The following table presents the attribution of net income to the Company and the noncontrolling interests for the years ended December 31:
 2017 2016 2015
 (in millions)
Net income$1,117
 $374
 $229
Less: Net income attributable to noncontrolling interests44
 32
 12
Less: Net income attributable to redeemable noncontrolling interests2
 4
 2
Net income attributable to the Company$1,071
 $338
 $215
11. ACQUISITIONS
During 2017 and 2016, in accordance with its overall growth strategy, the Company or one of its wholly-owned subsidiaries, acquired or contracted to acquire the projects discussed below. Also, in March 2016, the Company acquired an additional 15% interest in Desert Stateline, 51% of which was initially acquired in 2015. As a result, the Companyunder "Asset Acquisitions" and the class B member are now entitled to 66% and 34%, respectively, of all cash distributions from Desert Stateline. In addition, the Company will continue to be entitled to substantially all of the federal tax benefits with respect to the transaction. Acquisition-related costs were expensed as incurred and"Construction Projects" were not material for any of the years presented. There were no asset acquisitions during 2022.
Asset Acquisitions
Project
Facility
ResourceSeller
Approximate Nameplate Capacity (MW)
LocationSouthern
Power
Ownership
Percentage
Expected/Actual CODPPA
Contract Period
Asset Acquisitions During 2023
Millers Branch(a)
Solar
EDF Renewables
Development, Inc.
200Haskell County, TX100%Fourth quarter 202520 years
South CheyenneSolarHanwha Q Cells USA Corp.150Laramie County, WY100%Second quarter 202420 years
Asset Acquisitions During 2021
Deuel Harvest(b)
WindInvenergy Renewables LLC300Deuel County, SD100% of Class BFebruary 2021
25 years
and
15 years
(a)The following table presents the Company's acquisition activity for the year ended, and subsequentproject includes an option to expand capacity up to an additional 300 MWs. Subsequent to December 31, 2017.
Project FacilityResourceSeller, Acquisition Date
Approximate Nameplate Capacity (MW)
 LocationOwnership PercentageActual / Expected CODPPA Contract Period
Business Acquisitions During the Year Ended December 31, 2017
BethelWindInvenergy Wind Global LLC,
January 6, 2017
276 Castro County, TX100% January 201712 years
Cactus Flats(a)
WindRES America Developments, Inc.,
July 31, 2017
148 Concho County, TX100% Third quarter 201812 years and 15 years
Asset Acquisitions Subsequent to December 31, 2017
Gaskell West 1SolarRecurrent Energy Development Holdings, LLC,
January 26, 2018
20 Kern County, CA100% of Class B
(b) 
March
2018
20 years
(a)On July 31, 2017, the Company purchased 100% of the Cactus Flats facility and commenced construction. Upon placing the facility in service, the Company expects to close on a tax equity partnership agreement that has already been executed, subject to various customary conditions at closing, and will then own 100% of the class B membership interests.
(b)The Company owns 100% of the class B membership interest under a tax equity partnership agreement.

NOTES (continued)
2023, Southern Power Companycommitted to expand the construction of the facility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the second quarter 2026.
(b)In March 2021, Southern Power acquired a controlling interest in the project from Invenergy Renewables LLC and Subsidiary Companies 2017 Annual Report

Business Acquisitions Duringcompleted a tax equity transaction whereby it sold the Year Ended December 31, 2017Class A membership interests in the project. Southern Power consolidates the project's operating results in its financial statements and the tax equity partner and Invenergy Renewables LLC each own a noncontrolling interest.
The Company's aggregate purchase price for acquisitionsthe two projects acquired during 2023 was $193 million, which is primarily recorded within construction work in progress on the year endedbalance sheet at December 31, 2017 was $539 million. The fair values2023.
Construction Projects
Project
Facility
Resource
Approximate Nameplate Capacity (MW)
LocationCODPPA Contract Period
Projects Completed During 2022
Garland Solar Storage(a)
Battery energy storage88Kern County, CA
September 2021 through February 2022(b)
20 years
Tranquillity Solar Storage(a)
Battery energy storage72Fresno County, CA
November 2021 through
March 2022(c)
20 years
Projects Completed During 2021
Glass Sands(d)
Wind118Murray County, OKNovember 202112 years
(a)In 2020, Southern Power restructured its ownership of the assets acquiredproject, while retaining the controlling interests, by contributing the Class A membership interests to an existing partnership and liabilities assumed were finalized in 2017 and recorded as follows:
 2017
 (in millions)
Restricted cash$16
CWIP534
Other assets5
Accounts payable(16)
Total purchase price$539
In 2017, total revenuesselling 100% of $15 million and net income of $17 million, primarily as a result of PTCs, was recognizedthe Class B membership interests. During 2021, Southern Power further restructured its ownership in the consolidatedbattery energy storage projects and completed tax equity transactions whereby it sold the Class A membership interests in the projects. Southern Power consolidates each project's operating results in its financial statements and the tax equity partner and two other partners each own a noncontrolling interest. See Note 9 under "Lessor" for additional information.
(b)The facility has a total capacity of income by the Company related to the 2017 acquisitions. The Bethel facility did not have operating revenues or activities prior to completion88 MWs, of construction and beingwhich 73 MWs were placed in service in 2021 and the Cactus Flats15 MWs were placed in service in 2022.
(c)The facility is still under construction. Therefore, supplemental pro forma information as though the acquisitions occurred ashas a total capacity of 72 MWs, of which 32 MWs were placed in service in 2021 and 40 MWs were placed in service in 2022.
(d)In December 2020, Southern Power purchased 100% of the beginningmembership interests of 2017 and for the comparable 2016 period is not meaningful and has been omitted.Glass Sands facility.
Construction Projects in Progress
During the year ended December 31, 2017, in accordance with its overall growth strategy, the Company continued construction on the 345-MW Mankato expansion project and commenced construction on the Cactus Flats facility. Total aggregate construction costs for these facilities, excluding acquisition costs and including construction costs to complete the subsequently-acquired Gaskell West 1 solar project, are expected to be between $385 million and $430 million. At December 31, 2017, construction costs included in CWIP related to these projects totaled $188 million. The ultimate outcome of these matters cannot be determined at this time.
Development ProjectsPerformance Share Units
During 2017, as partPSUs granted to employees vest at the end of a three-year performance period. Shares of Southern Company common stock are delivered to employees at the end of the Company's renewable development strategy,performance period with the Company purchased wind turbine equipmentnumber of shares issued ranging from Siemens Wind Power, Inc. and Vestas-American Wind Technology, Inc.0% to be used for various development and construction projects, up to 900 MWs in total. Once these wind projects reach commercial operations, which is expected in 2021, they are expected to qualify for 80% PTCs.
During 2016, the Company entered into a joint development agreement with Renewable Energy Systems Americas, Inc. to develop and construct approximately 3,000 MWs of wind projects expected to be placed in service between 2018 and 2020. In addition, in 2016, the Company purchased wind turbine equipment from Siemens Wind Power, Inc. and Vestas-American Wind Technology, Inc. to be used for construction200% of the facilities. Once these wind projects reach commercial operations, they are expectedtarget number of PSUs granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company has issued two types of PSUs, each with a unique performance goal. These types of PSUs include total shareholder return (TSR) awards based on the TSR for Southern Company common stock during the three-year performance period as compared to qualify for 100% PTCs.a group of industry peers and ROE awards based on Southern Company's equity-weighted return over the performance period.
The ultimate outcomefair value of these matters cannot beTSR awards is determined as of the grant date using a Monte Carlo simulation model. In determining the fair value of the TSR awards issued to employees, the expected volatility is based on the historical volatility of Southern Company's stock over a period equal to the performance period. The risk-free rate is based on the U.S. Treasury yield curve in effect at this time.the time of grant that covers the performance period of the awards. The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of TSR awards granted:
Year Ended December 31202320222021
Expected volatility30.0%29.6%30.0%
Expected term (in years)
333
Interest rate3.8%1.7%0.2%
Weighted average grant-date fair value$76.83$79.69$69.06
The Registrants recognize TSR award compensation expense on a straight-line basis over the three-year performance period without remeasurement.
The fair values of ROE awards are based on the closing stock price of Southern Company common stock on the date of the grant. The weighted average grant-date fair value of the ROE awards granted during 2023, 2022, and 2021 was $68.93, $66.87, and $59.49, respectively. Compensation expense for ROE awards is generally recognized ratably over the three-year performance period adjusted for expected changes in ROE performance. Total compensation cost recognized for vested ROE awards reflects final performance metrics.
Southern Company had 2.4 million unvested PSUs outstanding at December 31, 2022. In February 2023, the PSUs that vested for the three-year performance period ended December 31, 2022 were converted into 1.8 million shares outstanding at a share price of $67.13. During 2023, Southern Company granted 1.3 million PSUs and 1.3 million PSUs were vested or forfeited, resulting in 2.4 million unvested PSUs outstanding at December 31, 2023. In February 2024, the PSUs that vested for the three-year performance period ended December 31, 2023 were converted into 2.3 million shares outstanding at a weighted average share price of $66.95.
Total PSU compensation cost, and the related tax benefit recognized in income, for the years ended December 31, 2023, 2022, and 2021 are as follows:
202320222021
(in millions)
Southern Company
Compensation cost recognized in income$107 $101 $112 
Tax benefit of compensation cost recognized in income28 26 29 
Southern Company Gas
Compensation cost recognized in income$14 $12 $17 
Tax benefit of compensation cost recognized in income4 
Total PSU compensation cost and the related tax benefit recognized in income were immaterial for all periods presented for all other Registrants. The compensation cost related to the grant of Southern Company PSUs to the employees of each Subsidiary Registrant is recognized in each Subsidiary Registrant's financial statements with a corresponding credit to equity representing a capital contribution from Southern Company.
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At December 31, 2023, Southern Company's total unrecognized compensation cost related to PSUs was $32 million and is expected to be recognized over a weighted-average period of approximately 19 months. The total unrecognized compensation cost related to PSUs at December 31, 2023 was immaterial for all other Registrants.
Restricted Stock Units
The fair value of RSUs is based on the closing stock price of Southern Company common stock on the date of the grant. The weighted average grant-date fair values of RSUs granted during 2023, 2022, and 2021 were $68.95, $67.20, and $59.56, respectively. For most RSU awards, one-third of the RSUs vest each year throughout a three-year service period and compensation cost for RSUs is generally recognized over the corresponding one-, two-, or three-year vesting period. Shares of Southern Company common stock are delivered to employees at the end of each vesting period.
Southern Power Company had 0.9 million RSUs outstanding at December 31, 2022. During 2023, Southern Company granted 0.5 million RSUs and Subsidiary Companies 2017 Annual Report
0.5 million RSUs were vested or forfeited, resulting in 0.9 million unvested RSUs outstanding at December 31, 2023, including RSUs related to employee retention agreements.

The following table presentsFor the Company's acquisitions for the yearyears ended December 31, 2016.
Project FacilityResourceSeller, Acquisition Date
Approximate
Nameplate Capacity (
MW)
 LocationOwnership PercentageActual CODPPA
Contract Period
Acquisitions for the Year Ended December 31, 2016
Boulder 1SolarSunPower Corporation,
November 16, 2016
100 Clark County, NV51%(a)December 201620 years
CalipatriaSolarSolar Frontier Americas Holding LLC,
February 11, 2016
20 Imperial County, CA100%(b)February 201620 years
East PecosSolarFirst Solar, Inc.,
March 4, 2016
120 Pecos County, TX100% March 201715 years
Grant PlainsWindApex Clean Energy Holdings, LLC,
August 26, 2016
147 Grant County, OK100% December 2016
20 years and 12 years (c)
Grant WindWindApex Clean Energy Holdings, LLC,
April 7, 2016
151 Grant County, OK100% April 201620 years
HenriettaSolarSunPower Corporation,
July 1, 2016
102 Kings County, CA51%(a)July 201620 years
LamesaSolarRES America Developments Inc.,
July 1, 2016
102 Dawson County, TX100% April 201715 years
Mankato (d)
Natural GasCalpine Corporation,
October 26, 2016
375 Mankato, MN100% 
N/A (e)
10 years
PassadumkeagWindQuantum Utility Generation, LLC,
June 30, 2016
42 Penobscot County, ME100% July 201615 years
RutherfordSolarCypress Creek Renewables, LLC,
July 1, 2016
74 Rutherford County, NC100%(b)December 201615 years
Salt ForkWindEDF Renewable Energy, Inc.,
December 1, 2016
174 Donley and Gray Counties, TX100% December 201614 years and 12 years
Tyler BluffWindEDF Renewable Energy, Inc.,
December 21, 2016
125 Cooke County, TX100% December 201612 years
Wake WindWindInvenergy Wind Global LLC,
October 26, 2016
257 Floyd and Crosby Counties, TX90.1%(f)October 201612 years
(a)The Company owns 100% of the class A membership interests and a wholly-owned subsidiary of the seller owns 100% of the class B membership interests. The Company and the class B member are entitled to 51% and 49%, respectively, of all cash distributions from the project. In addition, the Company is entitled to substantially all of the federal tax benefits with respect to the transaction.
(b)The Company originally purchased 90%, with a minority owner owning 10%. During 2017, the Company acquired the remaining 10% ownership interest. See Note 10 for additional information.
(c)In addition to the 20-year and 12-year PPAs, the facility has a 10-year contract with Allianz Risk Transfer (Bermuda) Ltd.
(d)Under the terms of the PPA and the expansion PPA, approximately $442 million of assets, primarily related to property, plant, and equipment, are subject to lien at December 31, 2017.
(e)The acquisition included a fully operational 375-MW natural gas-fired combined-cycle facility.
(f)The Company owns 90.1%, with the minority owner, Invenergy Wind Global LLC, owning 9.9%.
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NOTES (continued)
2023, 2022, and 2021, Southern Power CompanyCompany's total compensation cost for RSUs recognized in income was $30 million, $26 million, and Subsidiary Companies 2017 Annual Report

Acquisitions During$32 million, respectively. The related tax benefit also recognized in income was $8 million, $7 million, and $8 million for the Year Ended December 31, 2016
The Company's aggregate purchase price for acquisitions during the yearyears ended December 31, 2016 was2023, 2022, and 2021, respectively. Total unrecognized compensation cost related to RSUs at December 31, 2023, which is being recognized over a weighted-average period of approximately $2.3 billion. The17 months, is immaterial for Southern Company.
Total RSUs outstanding and total aggregate purchase price including minority ownership contributionscompensation cost and related tax benefit for the assumption of non-recourse construction debt toRSUs recognized in income for the Company was approximately $2.6 billion for these acquisitions. In connection with the Company's 2016 acquisitions, allocations of the purchase price to individual assets were finalized during the yearyears ended December 31, 2017 with no changes2023, 2022, and 2021, as well as the total unrecognized compensation cost at December 31, 2023, were immaterial for all other Registrants. The compensation cost related to amounts originally reported for Boulder 1, Grant Plains, Grant Wind, Henrietta, Mankato, Passadumkeag, Salt Fork, Tyler Bluff, and Wake Wind. The fair values of the assets and liabilities acquired through the business combinations were recorded as follows:
 2016
 (in millions)
CWIP$2,354
Property, plant, and equipment302
Intangible assets (a)
128
Other assets52
Accounts payable(16)
Debt(217)
Total purchase price$2,603
  
Funded by: 
The Company (b) (c)
$2,345
Noncontrolling interests (d) (e)
258
Total purchase price$2,603
(a)Intangible assets consist of acquired PPAs that will be amortized over 10- and 20-year terms. The estimated amortization for future periods is approximately $9 million per year. See Note 1 for additional information.
(b)At December 31, 2016, $461 million is included in acquisitions payable on the consolidated balance sheets.
(c)Includes approximately $281 million of contingent consideration, of which $29 million was payable at December 31, 2017.
(d)Includes approximately $51 million of non-cash contributions recorded as capital contributions from noncontrolling interests in the consolidated statements of stockholders' equity.
(e)Includes approximately $142 million of contingent consideration, all of which had been paid at December 31, 2016 by the noncontrolling interests.
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NOTES (continued)
Southern Power Company and Subsidiary Companies 2017 Annual Report

12. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Summarized quarterly financial information for 2017 and 2016 is as follows:
Quarter Ended
Operating
Revenues
 
Operating
Income
 Income Tax (Benefit) 
Net Income
Attributable to
the Company
 (in millions)
March 2017$450
 $65
 $(52) $70
June 2017529
 112
 (38) 82
September 2017618
 159
 (39) 124
December 2017 (*)
478
 32
 (810) 795
        
March 2016$315
 $47
 $(23) $50
June 2016373
 81
 (41) 89
September 2016500
 134
 (102) 176
December 2016389
 28
 (29) 23
(*)As a result of the Tax Reform Legislation, the Company recorded an income tax benefit of $743 million in the fourth quarter 2017. See Note 5 for additional information.
The Company's business is influenced by seasonal weather conditions.
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SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA 2013-2017
Southern Power Company and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2015
 2014
 2013
Operating Revenues (in millions):         
Wholesale — non-affiliates$1,671
 $1,146
 $964
 $1,116
 $923
Wholesale — affiliates392
 419
 417
 383
 346
Total revenues from sales of electricity2,063
 1,565
 1,381
 1,499
 1,269
Other revenues12
 12
 9
 2
 6
Total$2,075
 $1,577
 $1,390
 $1,501
 $1,275
Net Income Attributable to
   Southern Power (in millions)(a)
$1,071
 $338
 $215
 $172
 $166
Cash Dividends
   on Common Stock (in millions)
$317
 $272
 $131
 $131
 $129
Return on Average Common Equity (percent)(a)
22.39
 9.79
 10.16
 10.39
 10.73
Total Assets (in millions)(b)(c)
$15,206
 $15,169
 $8,905
 $5,233
 $4,417
Property, Plant, and Equipment
   In Service (in millions)
$13,755
 $12,728
 $7,275
 $5,657
 $4,696
Capitalization (in millions):         
Common stock equity$5,138
 $4,430
 $2,483
 $1,752
 $1,564
Redeemable noncontrolling interests
 164
 43
 39
 29
Noncontrolling interests1,360
 1,245
 781
 219
 
Long-term debt(b)
5,071
 5,068
 2,719
 1,085
 1,607
Total (excluding amounts due within one year)$11,569
 $10,907
 $6,026
 $3,095
 $3,200
Capitalization Ratios (percent):         
Common stock equity44.4
 40.6
 41.2
 56.6
 48.9
Redeemable noncontrolling interests
 1.5
 0.7
 1.3
 0.9
Noncontrolling interests11.8
 11.4
 13.0
 7.1
 
Long-term debt(b)
43.8
 46.5
 45.1
 35.0
 50.2
Total (excluding amounts due within one year)100.0
 100.0
 100.0
 100.0
 100.0
Kilowatt-Hour Sales (in millions):         
Wholesale — non-affiliates35,920
 23,213
 18,544
 19,014
 15,111
Wholesale — affiliates12,811
 15,950
 16,567
 11,194
 9,359
Total48,731
 39,163
 35,111
 30,208
 24,470
Plant Nameplate Capacity
   Ratings (year-end) (megawatts)
12,940
 12,442
 9,808
 9,185
 8,924
Maximum Peak-Hour Demand (megawatts):         
Winter3,421
 3,469
 3,923
 3,999
 2,685
Summer4,224
 4,303
 4,249
 3,998
 3,271
Annual Load Factor (percent)49.1
 50.0
 49.0
 51.8
 54.2
Plant Availability (percent)99.9
 91.6
 93.1
 91.8
 91.8
Source of Energy Supply (percent):         
Natural gas67.7
 79.4
 89.5
 86.0
 88.5
Solar, Wind, and Biomass22.8
 12.1
 4.3
 2.9
 1.1
Purchased power —         
From non-affiliates7.8
 6.8
 4.7
 6.4
 6.4
From affiliates1.7
 1.7
 1.5
 4.7
 4.0
Total100.0
 100.0
 100.0
 100.0
 100.0
Employees (year-end)(d)
541
 
 
 
 
(a)As a result of the Tax Reform Legislation, the Company recorded an income tax benefit of $743 million in 2017.
(b)A reclassification of debt issuance costs from Total Assets to Long-term debt of $11 million and $12 million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(c)A reclassification of deferred tax assets from Total Assets of $306 million and $- million is reflected for years 2014 and 2013, respectively, in accordance with new accounting standards adopted in 2015 and applied retrospectively.
(d)Prior to the employee transfer in December 2017, the Company had no employees, but was billed employee related costs from SCS.
Table of ContentsIndex to Financial Statements

SOUTHERN COMPANY GAS
FINANCIAL SECTION

Table of ContentsIndex to Financial Statements

MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Southern Company Gas and Subsidiary Companies 2017 Annual Report
The managementgrant of Southern Company Gas (the Company)RSUs to the employees of each Subsidiary Registrant is responsible for establishing and maintaining an adequate system of internal control overrecognized in such Subsidiary Registrant's financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.statements with a corresponding credit to equity representing a capital contribution from Southern Company.
Under management's supervision, an evaluation of the design and effectiveness of the Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that the Company's internal control over financial reporting was effective as of December 31, 2017.Stock Options

/s/ Andrew W. Evans
Andrew W. Evans
Chairman, President, and Chief Executive Officer

/s/ Elizabeth W. Reese
Elizabeth W. Reese
Executive Vice President, Chief Financial Officer, and Treasurer
February 20, 2018
Table of ContentsIndex to Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors ofIn 2015, Southern Company Gas and Subsidiary Companies
Opinion on the Financial Statements
We have audited the accompanying consolidated balance sheets and consolidated statements of capitalization of Southern Company Gas and Subsidiary Companies (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows for the year ended December 31, 2017 and the six month periods ended June 30, 2016 (Predecessor) and December 31, 2016 (Successor), and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements (pages II-593 to II-651) present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for the year ended December 31, 2017 and the six months ended June 30, 2016 (Predecessor) and December 31, 2016 (Successor), in conformity with accounting principles generally accepted in the United States of America.
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We did not audit the financial statements of Southern Natural Gas Company, L.L.C. (SNG), the Company's investment in which is accounted for by the use of the equity method. The accompanying consolidated financial statements of the Company include its equity investment in SNG of $1,262 million and $1,394 million as of December 31, 2017 and December 31, 2016, respectively, and its earnings from its equity method investment in SNG of $88 million and $56 million for the year ended December 31, 2017 and the six months ended December 31, 2016, respectively. Those statements were audited by other auditors whose report (which expresses an unqualified opinion on SNG's financial statements and contains an emphasis of matter paragraph concerning the extent of its operations and relationships with affiliated entities) have been furnished to us, and our opinion, insofar as it relates to the amounts included for SNG, is based solely on the report of the other auditors. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.
Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits and the report of the other auditors provide a reasonable basis for our opinion.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018
We have served as the Company's auditor since 2016.
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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Southern Company Gas and Subsidiary Companies
In our opinion, the consolidated statement of income, comprehensive income, common stockholders' equity, and cash flows present fairly, in all material respects, the results of operations and cash flows of Southern Company Gas (formerly AGL Resources Inc.) and its subsidiaries for the year ended December 31, 2015, in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule for the year ended December 31, 2015 presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. These financial statements and financial statement schedule are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements and the financial statement schedule based on our audit. We conducted our audit of these financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.


/s/ PricewaterhouseCoopers LLP
Atlanta, Georgia
February 11, 2016
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DEFINITIONS
TermMeaning
AFUDCAllowance for funds used during construction
ASCAccounting Standards Codification
ASUAccounting Standards Update
Atlanta Gas LightAtlanta Gas Light Company, a wholly-owned subsidiary of Southern Company Gas
Atlantic Coast PipelineAtlantic Coast Pipeline, LLC
Chattanooga GasChattanooga Gas Company
Chicago HubA venture of Nicor Gas, which provides natural gas storage and transmission-related services to marketers and gas distribution companies
CUBCitizens Utility Board, in Illinois
Dalton PipelineA 50% undivided ownership interest in a pipeline facility in Georgia
EBITEarnings before interest and taxes
EPAU.S. Environmental Protection Agency
FASBFinancial Accounting Standards Board
FERCFederal Energy Regulatory Commission
FitchFitch Ratings, Inc.
GAAPU.S. generally accepted accounting principles
Heating Degree DaysA measure of weather, calculated when the average daily temperatures are less than 65 degrees Fahrenheit
Heating SeasonThe period from November through March when natural gas usage and operating revenues are generally higher
Horizon PipelineHorizon Pipeline Company, LLC
Illinois CommissionIllinois Commerce Commission
IRSInternal Revenue Service
ITCInvestment tax credit
LIBORLondon Interbank Offered Rate
LIFOLast-in, first-out
LNGLiquefied natural gas
LOCOMLower of weighted average cost or current market price
MarketersMarketers selling retail natural gas in Georgia and certificated by the Georgia PSC
MergerThe merger of a wholly-owned, direct subsidiary of Southern Company, with and into Southern Company Gas, effective July 1, 2016, with Southern Company Gas continuing as the surviving corporation and a wholly-owned, direct subsidiary of Southern Company
MGPManufactured gas plant
mmBtuMillion British thermal units
Moody'sMoody's Investors Service, Inc.
natural gas distribution utilitiesSouthern Company Gas' seven natural gas distribution utilities (Nicor Gas, Atlanta Gas Light, Virginia Natural Gas, Elizabethtown Gas, Florida City Gas, Chattanooga Gas, and Elkton Gas)
New Jersey BPUNew Jersey Board of Public Utilities
Nicor GasNorthern Illinois Gas Company, doing business as Nicor Gas Company
NYMEXNew York Mercantile Exchange, Inc.
OCIOther comprehensive income
Table of ContentsIndex to Financial Statements

DEFINITIONS
(continued)
TermMeaning
PennEast PipelinePennEast Pipeline Company, LLC
PiedmontPiedmont Natural Gas Company, Inc.
Pivotal Utility Holdings
Pivotal Utility Holdings, Inc., a wholly-owned subsidiary of Southern Company Gas,
doing business as Elizabethtown Gas, Elkton Gas, and Florida City Gas
PRPPipeline Replacement Program, Atlanta Gas Light's 15-year infrastructure replacement program, which ended in December 2013
PSCPublic Service Commission
ROEReturn on equity
S&PS&P Global Ratings, a division of S&P Global Inc.
SCSSouthern Company Services, Inc. (the Southern Company system service company)
SECU.S. Securities and Exchange Commission
SequentSequent Energy Management, L.P.
SNGSouthern Natural Gas Company, L.L.C.
Southern CompanyThe Southern Company
Southern Company Gas CapitalSouthern Company Gas Capital Corporation, a 100%-owned subsidiary of Southern Company Gas
Southern Company systemSouthern Company, the traditional electric operating companies, Southern Power, Southern Company Gas (as of July 1, 2016), Southern Electric Generating Company, Southern Nuclear, SCS, Southern Linc, PowerSecure, Inc. (as of May 9, 2016), and other subsidiaries
Southern HoldingsSouthern Company Holdings, Inc.
Southern LincSouthern Communications Services, Inc.
Southern NuclearSouthern Nuclear Operating Company, Inc.
Southern PowerSouthern Power Company and its subsidiaries
SouthStarSouthStar Energy Services, LLC
STRIDEAtlanta Gas Light's Strategic Infrastructure Development and Enhancement program
traditional electric operating companiesAlabama Power Company, Georgia Power Company, Gulf Power Company, and Mississippi Power Company
Tax Reform LegislationThe Tax Cuts and Jobs Act, which was signed into law on December 22, 2017 and became effective on January 1, 2018
TritonTriton Container Investments, LLC
VIEVariable interest entity
Virginia CommissionVirginia State Corporation Commission
Virginia Natural GasVirginia Natural Gas, Inc.
WACOGWeighted average cost of gas
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MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Southern Company Gas and Subsidiary Companies 2017 Annual Report
OVERVIEW
Business Activities
Southern Company Gas is an energy services holding company whose primary business is the distribution of natural gas through utilities in seven states – Illinois, Georgia, Virginia, New Jersey, Florida, Tennessee, and Maryland. Southern Company Gas and its subsidiaries (the Company) are also involved in several other complementary businesses.
The Company has four reportable segments – gas distribution operations, gas marketing services, wholesale gas services, and gas midstream operations – and one non-reportable segment, all other. See Note 12 to the financial statements for additional information.
Many factors affect the opportunities, challenges, and risks of the Company's business. These factors include the ability to maintain safety, to maintain constructive regulatory environments, to maintain and grow natural gas sales and number of customers, and to effectively manage and secure timely recovery of costs. These costs include those related to projected long-term demand growth, environmental standards, reliability, natural gas, and capital expenditures, including updating and expanding the natural gas distribution systems. The natural gas distribution utilities have various regulatory mechanisms that operate to address cost recovery. Effectively operating pursuant to these regulatory mechanisms and appropriately balancing required costs and capital expenditures with customer prices will continue to challenge the Company for the foreseeable future.
Merger, Acquisition, and Disposition Activities
On July 1, 2016, the Company completed the Merger, pursuant to which the Company became a wholly-owned subsidiary of Southern Company. Southern Company accounted for the Merger using the acquisition method of accounting whereby the assets acquired and liabilities assumed were recognized at fair value as of the acquisition date. Pushdown accounting was applied to create a new cost basis for the Company's assets, liabilities, and equity as of the acquisition date. Accordingly, the successor financial statements reflect the new basis of accounting, and successor and predecessor period financial results (separated by a heavy black line) are presented, but are not comparable. As a result of the application of acquisition accounting, certain discussions herein include disclosure of the predecessor and successor periods. See Note 11 to the financial statements under "Merger with Southern Company" for additional information.
In September 2016, the Company paid approximately $1.4 billion to acquire a 50% equity interest in SNG, which is the owner of a 7,000-mile pipeline system connecting natural gas supply basins in Texas, Louisiana, Mississippi, and Alabama to markets in Louisiana, Mississippi, Alabama, Florida, Georgia, South Carolina, and Tennessee. The investment in SNG is accounted for using the equity method. On March 31, 2017, the Company made an additional $50 million contribution to maintain its 50% equity interest in SNG. See Note 4 to the financial statements under "Equity Method Investments – SNG" and Note 11 to the financial statements under "Investment in SNG" for additional information.
In October 2016, the Company completed its purchase of Piedmont's 15% interest in SouthStar for $160 million. See Note 4 to the financial statements under "Variable Interest Entities" for additional information.
On October 15, 2017, the Company's subsidiary, Pivotal Utility Holdings, entered into agreements for the sale of the assets of two of its natural gas distribution utilities, Elizabethtown Gas and Elkton Gas, to South Jersey Industries, Inc. for a total cash purchase price of $1.7 billion.discontinued granting stock options. As of December 31, 2017, all stock option awards were vested and compensation cost fully recognized. Stock options expire no later than 10 years after the net bookgrant date and the latest possible exercise will occur by November 2024. At December 31, 2023, the weighted average remaining contractual term for the options outstanding and exercisable was approximately 2 months.
Southern Company's activity in the stock option program for 2023 is summarized below:
Shares Subject to OptionWeighted Average Exercise Price
(in millions)
Outstanding at December 31, 20221.0 $42.22 
Exercised0.7 42.54 
Outstanding and Exercisable at December 31, 20230.3 $41.58 
Southern Company's cash receipts from issuances related to stock options exercised under the share-based payment arrangements for the years ended December 31, 2023, 2022, and 2021 were $28 million, $75 million, and $66 million, respectively.
At December 31, 2023, the aggregate intrinsic value for options outstanding and exercisable was immaterial for all Registrants.
Total intrinsic value of options exercised, and the assets to be disposed of inrelated tax benefit, for the sale was approximately $1.3 billion, which includes approximately $0.5 billion of goodwill. The goodwill is not deductibleyears ended December 31, 2023, 2022, and 2021 are presented below for tax purposes and, as a result, a deferred tax liability has not yet been provided. Through the completion of the asset sales, the Company intends to invest less than $0.1 billion in capital additions required for ordinary business operations of these assets. The completion of each asset sale is subject to the satisfaction or waiver of certain conditions, including, among other customary closing conditions, the receipt of required regulatory approvals, including the FERC, the Federal Communications Commission, the New Jersey BPU, and, with respect to the sale of Elkton Gas, the Maryland PSC. TheSouthern Company and South Jersey Industries, Inc. made joint filings on December 22, 2017 and January 16, 2018 with the New Jersey BPU and the Maryland PSC, respectively, requesting regulatory approval. The asset sales are expected to be completed by the end of the third quarter 2018.were immaterial for all other Registrants:
The ultimate outcome of these matters cannot be determined at this time.
Operating Metrics
The Company continues to focus on several operating metrics, including Heating Degree Days, customer count, and volumes of natural gas sold.
Year Ended December 31202320222021
(in millions)
Southern Company
Intrinsic value of options exercised$18 $49 $34 
Tax benefit of options exercised4 12 
II-230

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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)COMBINED NOTES TO FINANCIAL STATEMENTS
Southern Company Gas and Subsidiary Companies 2017 Annual Report



13. FAIR VALUE MEASUREMENTS
The Company measures weather and the effect on its business using Heating Degree Days. Generally, increased Heating Degree Days result in higher demand for natural gas on the Company's distribution system. With the exception of the Company's utilities in Illinois and Florida, the Company has various regulatory mechanisms, such as weather normalization and straight-fixed-variable rate design, which limit its exposure to weather changes within typical ranges in each of its utilities' respective service territory. However, the utility customers in Illinois and the gas marketing services customers primarily in Georgia, Illinois, and Ohio can be impacted by warmer- or colder-than-normal weather. The Company utilizes weather hedges to reduce negative earnings impact in the event of warmer-than-normal weather, while retaining most of the earnings upside for these businesses.
The number of customers served by gas distribution operations and gas marketing services can be impacted by natural gas prices, economic conditions, and competition from alternative fuels. Gas marketing services' customers are primarily located in Georgia, Illinois, and Ohio.
The Company's natural gas volume metrics for gas distribution operations and gas marketing services illustrate the effects of weather and customer demand for natural gas. Wholesale gas services' physical sales volumes represent the daily average natural gas volumes sold to its customers.
See RESULTS OF OPERATIONS herein for additional information on these operating metrics.
Seasonality of Results
During the Heating Season, natural gas usage and operating revenues are generally higher as more customers are connected to the gas distribution systems and natural gas usage is higher in periods of colder weather. Occasionally in the summer, wholesale gas services' operating revenues are impacted due to peak usage by power generators in response to summer energy demands. The Company's base operating expenses, excluding cost of natural gas, bad debt expense, and certain incentive compensation costs, are incurred relatively evenly throughout the year. Seasonality also affects the comparison of certain balance sheet items across quarters, including receivables, unbilled revenues, natural gas for sale, and notes payable. However, these items are comparable when reviewing the Company's annual results. Thus, the Company's operating results can vary significantly from quarter to quarter as a result of seasonality, which is illustrated in the table below.
  Percent Generated During Heating Season
  Operating Revenues EBIT Net Income
Successor - 2017 67.3% 69.6% 73.7%
Successor - July 1, 2016 through December 31, 2016 67.1% 81.5% 96.5%
Predecessor - January 1, 2016 through June 30, 2016 70.0% 107.0% 138.9%
Predecessor - 2015 68.1% 77.3% 85.0%
Earnings
Net income attributable to the Company for the successor year ended December 31, 2017 was $243 million, which included net income of $53 million from the Company's investment in SNG (including $18 million related to a non-cash charge recorded by SNG to establish a regulatory liability associated with the Tax Reform Legislation) and $44 million generated from the Company's continued investment in infrastructure replacement programs and base rate increases at Atlanta Gas Light, Elizabethtown Gas, and Virginia Natural Gas, less the associated increases in depreciation. Net income also reflects $130 million of additional tax expense resulting from the revaluation of deferred tax assets of $93 million related to the Tax Reform Legislation and $37 million associated with State of Illinois income tax legislation enacted in the third quarter 2017 and new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings. Also included in net income was $17 million of additional expense resulting from the pushdown of acquisition accounting. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Notes 5 and 11 to the financial statements for additional information.
Net income attributable to the Company for the successor period of July 1, 2016 through December 31, 2016 was $114 million, which included $26 million in earnings from the SNG investment, net of related interest expense, partially offset by $12 million of additional expense resulting from the impact of the pushdown of acquisition accounting and $27 million of Merger-related expenses.
Net income attributable to the Company for the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015 were $131 million and $353 million, respectively, which included $41 million and $26 million, respectively, of Merger-related expenses, and $14 million and $20 million, respectively, of net income attributable to the SouthStar
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


noncontrolling interest, which the Company purchased in October 2016. Net income for the predecessor periods reflected higher revenues from continued investment in infrastructure programs, partially offset by warm weather, net of hedging, and low earnings from wholesale gas services due to mark-to-market losses.
RESULTS OF OPERATIONS
Operating Results
A condensed income statement for the Company follows:
 Successor  Predecessor
 Year Ended December 31, July 1, 2016 through December 31,  January 1, 2016 through June 30, Year Ended December 31,
 2017 2016  2016 2015
 (in millions)  (in millions)
Operating revenues$3,920
 $1,652
  $1,905
 $3,941
Cost of natural gas and other sales1,630
 623
  769
 1,645
Other operations and maintenance940
 482
  454
 928
Depreciation and amortization501
 238
  206
 397
Taxes other than income taxes184
 71
  99
 181
Merger-related expenses
 41
  56
 44
Total operating expenses3,255
 1,455
  1,584
 3,195
Operating income665
 197
  321
 746
Earnings from equity method investments106
 60
  2
 6
Interest expense, net of amounts capitalized200
 81
  96
 175
Other income (expense), net39
 14
  5
 9
Earnings before income taxes610
 190
  232
 586
Income taxes367
 76
  87
 213
Net Income243
 114
  145
 373
Less: Net income attributable to noncontrolling interest
 
  14
 20
Net Income Attributable to Southern Company Gas$243
 $114
  $131
 $353
Operating Revenues
Operating revenues for the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016 were $3.9 billion and $1.7 billion, respectively. For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, operating revenues were $1.9 billion and $3.9 billion, respectively.
For the successor year ended December 31, 2017, natural gas revenues included recovery of $1.6 billion in cost of natural gas and $6 million in net revenues from wholesale gas services, net of $21 million of amortization associated with assets established in the application of acquisition accounting. Also included in natural gas revenues for the successor year ended December 31, 2017 were $99 million in additional revenues generated from gas distribution operations as a result of continued investment in infrastructure replacement programs and increases in base rate revenues at Atlanta Gas Light, Elizabethtown Gas, and Virginia Natural Gas. Natural gas revenues were partially offset by a $13 million negative impact of warmer-than-normal weather, net of hedging.
For the successor period of July 1, 2016 through December 31, 2016, natural gas revenues included recovery of $613 million in cost of natural gas and $24 million in net revenues from wholesale gas services, net of $5 million of amortization associated with assets established in the application of acquisition accounting. Natural gas revenues were partially offset by a $5 million decrease attributable to warmer-than-normal weather, net of hedging.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, natural gas revenues included recovery of $755 million and $1.6 billion, respectively, in cost of natural gas, as well as $32 million in net losses and $202 million in net revenues, respectively, from wholesale gas services. For the predecessor period of January 1, 2016 through June 30, 2016, natural gas revenues included a negative impact of $7 million attributable to warmer-than-normal weather,
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


net of hedging. For the predecessor year ended December 31, 2015, natural gas revenues included a positive impact of $2 million also attributable to warmer-than-normal weather, net of hedging.
See "Segment Information" herein for additional information on wholesale gas services' revenues and losses.
Natural gas distribution rates include provisions to adjust billings for fluctuations in natural gas costs. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. See "Cost of Natural Gas" herein for additional information. Revenue impacts from weather and customer growth are described further below.
During Heating Season, natural gas usage and operating revenues are generally higher. Weather typically does not have a significant net income impact during the non-Heating Season. The following table presents the Heating Degree Days information for Illinois and Georgia, the primary locations where the Company's operations are impacted by weather.
  Years Ended December 31, 2017 vs. normal 2017 vs. 2016 2016 vs. 2015
  
Normal(a)
 2017 2016 2015 (warmer) colder (warmer) (warmer)
  (in thousands)      
Illinois(b)
 5,869
 5,246
 5,243
 5,433
 (10.6)% 0.1 % (3.5)%
Georgia 2,614
 1,970
 2,175
 2,204
 (24.6)% (9.4)% (1.3)%
(a)Normal represents the 10-year average from January 1, 2007 through December 31, 2016 for Illinois at Chicago Midway International Airport and for Georgia at Atlanta Hartsfield-Jackson International Airport, based on information obtained from the National Oceanic and Atmospheric Administration, National Climatic Data Center.
(b)The 10-year average Heating Degree Days established by the Illinois Commission in Nicor Gas' 2009 rate case is 5,600 annually from 1998 through 2007.
The Company hedged its exposure to warmer-than-normal weather at Nicor Gas in Illinois; therefore, the weather-related negative pre-tax income impact on gas distribution operations was limited to $4 million ($2 million after tax), $1 million ($1 million after tax), $7 million ($5 million after tax), and a positive impact of $2 million ($1 million after tax) for the successor year ended December 31, 2017, the successor period of July 1, 2016 through December 31, 2016, the predecessor period of January 1, 2016 through June 30, 2016, and the predecessor year ended December 31, 2015, respectively.
The Company also hedged its exposure to warmer-than-normal weather at gas marketing services in Georgia and Illinois; therefore, the weather-related negative pre-tax income impact on gas marketing services was limited to $9 million ($5 million after tax) and $4 million ($3 million after tax) for the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016, respectively. There was no weather impact for the predecessor period of January 1, 2016 through June 30, 2016 or the predecessor year ended December 31, 2015.
The following table provides the number of customers served by the Company for the periods presented:
  December 31,
  
2017(a)
 
2016(a)
 
2015(b)
  (in thousands, except market share %)
Gas distribution operations 4,623
 4,586
 4,526
Gas marketing services      
Energy customers(c)
 774
 656
 645
Market share of energy customers in Georgia 29.2% 29.6% 29.7%
Service contracts 1,184
 1,198
 1,171
(a)Includes customer and contract counts at December 31, 2017 and 2016.
(b)Includes average customer and contract counts for the year ended December 31, 2015.
(c)Includes approximately 140,000 customers at December 31, 2017 that were contracted to serve beginning April 1, 2017.
The Company anticipates overall customer growth trends at gas distribution operations to continue as it expects continued improvement in the new housing market and low natural gas prices. The Company uses a variety of targeted marketing programs to attract new customers and to retain existing customers.
Gas marketing services' market share in Georgia decreased at December 31, 2017 compared to the two prior years as a result of a highly competitive marketing environment, which is expected to continue for the foreseeable future. The Company will continue efforts at gas marketing services to enter into targeted markets and expand its energy customers and service contracts.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Cost of Natural Gas and Other Sales
Natural gas costs are the largest expense for the Company. Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, gas distribution operations charges its utility customers for natural gas consumed using natural gas cost recovery mechanisms set by the applicable state regulatory agencies. Under these mechanisms, all prudently-incurred natural gas costs are passed through to customers without markup, subject to regulatory review. Gas distribution operations defers or accrues the difference between the actual cost of natural gas and the amount of commodity revenue earned in a given period. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred natural gas costs are reflected as regulatory assets and accrued natural gas costs are reflected as regulatory liabilities. Therefore, gas costs recovered through natural gas revenues generally equal the amount expensed in cost of natural gas and do not affect net income from gas distribution operations. Cost of natural gas at gas distribution operations represented 79.6% of total cost of natural gas for 2017.
Gas marketing services customers are charged for actual or estimated natural gas consumed. Cost of natural gas includes the cost of fuel, lost and unaccounted for gas, adjustments to reduce theFair value of inventories to market value, and gains and losses associated with certain derivatives.
Cost of natural gas was $1.6 billion for the successor year ended December 31, 2017, which reflected an increase in natural gas pricing of 26.3% during the year compared to 2016, partially offset by lower demand for natural gas.
For the successor period of July 1, 2016 through December 31, 2016, cost of natural gas was $613 million and reflected low demand for natural gas driven by warm weather in the fourth quarter 2016.
Cost of natural gas was $755 million and $1.6 billion for the predecessor period of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, respectively, and reflected low demand for natural gas driven by warm weather during those periods.
The following table details the volumes of natural gas sold during all periods presented.
  Year Ended December 31, 2017 vs. 2016 2016 vs. 2015
  2017 2016 2015 % Change % Change
Gas distribution operations (mmBtu in millions)
          
Firm 667
 670
 695
 (0.4)% (3.6)%
Interruptible 95
 96
 99
 (1.0)% (3.0)%
Total 762
 766
 794
 (0.5)% (3.5)%
Gas marketing services (mmBtu in millions)
          
Firm:          
Georgia 23
 34
 35
 (32.4)% (2.9)%
Illinois 8
 12
 13
 (33.3)% (7.7)%
Other emerging markets 15
 12
 11
 25.0 % 9.1 %
Interruptible large commercial and industrial 11
 14
 14
 (21.4)%  %
Total 57
 72
 73
 (20.8)% (1.4)%
Wholesale gas services          
Daily physical sales (mmBtu in millions/day)
 6.4
 7.4
 6.8
 (13.5)% 8.8 %
Other Operations and Maintenance Expenses
For the successor year ended December 31, 2017, other operations and maintenance expenses were $940 million and primarily reflected compensation and benefit costs and professional services, including pipeline compliance and maintenance and legal services.
For the successor period of July 1, 2016 through December 31, 2016, other operations and maintenance expenses were $482 million and primarily reflected compensation and benefit costs and professional services, including pipeline compliance and maintenance and legal services.
For the predecessor period of January 1, 2016 through June 30, 2016, other operations and maintenance expenses were $454 million consistent with the level of expenses in the corresponding period in 2015.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


For the predecessor year ended December 31, 2015, other operations and maintenance expenses were $928 million and included pipeline compliance and maintenance costs, compensation and benefit costs, and a $14 million goodwill impairment charge. See ACCOUNTING POLICIES – "Assessment of Assets" herein and Note 1 to the financial statements under "Goodwill and Other Intangible Assets and Liabilities" for additional information on the goodwill impairment charge.
Depreciation and Amortization
For the successor year ended December 31, 2017, depreciation and amortization was $501 million and included $38 million of additional amortization of intangible assets as a result of fair value adjustments in acquisition accounting, primarily at gas marketing services and $28 million in additional depreciation at gas distribution operations, primarily due to continued investment in infrastructure programs.
For the successor period of July 1, 2016 through December 31, 2016, depreciation and amortization was $238 million and included $23 million of additional amortization of intangible assets as a result of fair value adjustments in acquisition accounting, primarily at gas marketing services, as well as depreciation at gas distribution operations due to continued investment in infrastructure programs.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, depreciation and amortization was $206 million and $397 million, respectively, and reflected depreciation related to additional assets placed in service at gas distribution operations due to continued investment in infrastructure programs.
See Notes 3 and 11 to the financial statements under "Regulatory Matters – Regulatory Infrastructure Programs" and "Merger with Southern Company," respectively, for additional information on infrastructure programs and the application of acquisition accounting.
Taxes Other Than Income Taxes
For the successor year ended December 31, 2017, taxes other than income taxes were $184 million, which consisted primarily of revenue tax expenses, property taxes, and payroll taxes.
For the successor period of July 1, 2016 through December 31, 2016, taxes other than income taxes were $71 million, which consisted primarily of revenue tax expenses, property taxes, and payroll taxes.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, taxes other than income taxes were $99 million and $181 million, respectively, which consisted primarily of revenue tax expenses, property taxes, and payroll taxes.
Merger-Related Expenses
There were no Merger-related expenses in the successor year ended December 31, 2017.
For the successor period of July 1, 2016 through December 31, 2016, Merger-related expenses were $41 million, including $18 million in rate credits provided to the customers of Elizabethtown Gas and Elkton Gas as conditions of the Merger, $20 million for additional compensation-related expenses, and $3 million for financial advisory fees, legal expenses, and other Merger-related costs.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, Merger-related expenses were $56 million and $44 million, respectively, including $31 million and $20 million, respectively, for financial advisory fees, legal expenses, and other Merger-related costs, and $25 million and $24 million, respectively, for additional compensation-related expenses.
See Note 11 to the financial statements under "Merger with Southern Company" for additional information.
Earnings from Equity Method Investments
For the successor year ended December 31, 2017, earnings from equity method investments were $106 million, reflecting $88 million in earnings from the Company's investment in SNG, including $33 million related to a non-cash charge recorded by SNG to establish a regulatory liability associated with the Tax Reform Legislation, and $18 million in earnings from all other investments.
For the successor period of July 1, 2016 through December 31, 2016, earnings from equity method investments were $60 million, reflecting $56 million in earnings from the Company's investment in SNG and $4 million in earnings from all other investments.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, earnings from equity method investments were not material.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


See Notes 4 and 11 to the financial statements under "Equity Method Investments" and "Investment in SNG," respectively, for additional information on the Company's investment in SNG.
Interest Expense, Net of Amounts Capitalized
For the successor year ended December 31, 2017, interest expense, net of amounts capitalized was $200 million, which includes the $38 million fair value adjustment on long-term debt in acquisition accounting. Interest expense also reflects debt issuances and redemptions during the period and the recognition of previously deferred interest related to regulatory infrastructure programs.
For the successor period of July 1, 2016 through December 31, 2016, interest expense, net of amounts capitalized was $81 million, which includes the $19 million fair value adjustment on long-term debt in acquisition accounting. Interest expense also reflects debt issuances and redemptions during the period and the recognition of previously deferred interest related to regulatory infrastructure programs.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, interest expense, net of amounts capitalized was $96 million and $175 million, respectively, reflecting debt issuances and redemptions during the period and the recognition of previously deferred interest related to regulatory infrastructure programs.
See FUTURE EARNINGS POTENTIAL – "Unrecognized Ratemaking Amounts" herein for additional information on the unrecognized costs related to the infrastructure programs. Also see FINANCIAL CONDITION AND LIQUIDITY – "Financing Activities" herein and Note 6 to the financial statements for additional information on outstanding debt.
Other Income (Expense), Net
For the successor year ended December 31, 2017, other income (expense), net was $39 million and primarily related to a $20 million gain from the settlement of contractor litigation claims, tax gross-up on contributions in aid of construction, and AFUDC. See Note 3 to the financial statements under "Regulatory Matters – PRP Settlement" for additional information on contractor litigation claims.
For the successor period of July 1, 2016 through December 31, 2016, other income (expense), net was $14 million and primarily related to the tax gross-up of contributions in aid of construction received from customers.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, other income (expense), net was not material.
Income Taxes
For the successor year ended December 31, 2017, income taxes were $367 million. The effective tax rate in 2017 reflects additional expense from the revaluation of deferred tax assets of $93 million associated with the Tax Reform Legislation and $37 million associated with State of Illinois income tax legislation enacted in the third quarter 2017 and new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings.
For the successor period of July 1, 2016 through December 31, 2016, income taxes were $76 million. The effective tax rate during this period reflects certain nondeductible Merger-related charges.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, income taxes were $87 million and $213 million, respectively. The effective tax rate in both periods reflects certain nondeductible Merger-related expenses and other charges.
The effective tax rate for each period presented is consistent when adjusted for the additional expense recorded from the revaluation of deferred tax assets associated with the Tax Reform Legislation, the State of Illinois income tax legislation enacted in the third quarter 2017, the allocation of new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings in 2017, and the nondeductible Merger-related charges for each period in 2017, 2016, and 2015.
See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Note 5 to the financial statements for additional information.
Noncontrolling Interest
Prior to the October 2016 acquisition of Piedmont's 15% interest in SouthStar, net income attributable to noncontrolling interest was recorded on the statements of income and totaled $14 million and $20 million in the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, respectively. See Note 4 to the financial statements under
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


"Variable Interest Entities" for additional information.
Effects of Inflation
The Company is subject to rate regulation that is generally based on the recovery of historical and projected costs. The effects of inflation can create an economic loss since the recovery of costs could be in dollars that have less purchasing power. Any adverse effect of inflation on the Company's results of operations has not been substantial in recent years.
Performance and Non-GAAP Measures
Prior to the Merger, the Company evaluated segment performance using EBIT, which includes operating income, earnings from equity method investments, and other income (expense), net. EBIT excludes interest expense, net of amounts capitalized and income taxes (benefit), which were evaluated on a consolidated basis for those periods. EBIT is used herein to discuss the results of the Company's segments for the predecessor periods, as EBIT was the primary measure of segment profit or loss for those periods. Subsequent to the Merger, the Company changed its segment performance measure from EBIT to net income to better align with the performance measure utilized by Southern Company. EBIT for the year ended December 31, 2017 and the period of July 1, 2016 through December 31, 2016 presented herein is considered a non-GAAP measure. The Company also discusses consolidated EBIT, which is considered a non-GAAP measure for all periods presented. The presentation of consolidated EBIT is believed to provide useful supplemental information regarding a consolidated measure of profit or loss. The Company further believes the presentation of segment EBIT for the year ended December 31, 2017 and the period of July 1, 2016 through December 31, 2016 is useful as it allows for a measure of comparability to other companies with different capital and legal structures, which accordingly may be subject to different interest rates and effective tax rates. The applicable reconciliations of net income to consolidated EBIT and segment EBIT are provided herein.
Adjusted operating margin is a non-GAAP measure that is calculated as operating revenues less cost of natural gas, cost of other sales, and revenue tax expense. Adjusted operating margin excludes other operations and maintenance expenses, depreciation and amortization, taxes other than income taxes, and Merger-related expenses, which are included in the calculation of operating income as calculated in accordance with GAAP and reflected in the statements of income. The presentation of adjusted operating margin is believed to provide useful information regarding the contribution resulting from customer growth at gas distribution operations since the cost of natural gas and revenue tax expense can vary significantly and are generally billed directly to customers. The Company further believes that utilizing adjusted operating margin at gas marketing services, wholesale gas services, and gas midstream operations allows it to focus on a direct measure of performance before overhead costs. The applicable reconciliation of operating income to adjusted operating margin is provided herein.
EBIT and adjusted operating margin should not be considered alternatives to, or more meaningful indicators of, the Company's operating performance than net income attributable to the Company or operating income as determined in accordance with GAAP. In addition, the Company's adjusted operating margin may not be comparable to similarly titled measures of other companies.
See RESULTS OF OPERATIONS herein for information on the Company's financial performance.
Reconciliations of operating income to adjusted operating margin and net income attributable to Southern Company Gas to EBIT are as follows:
 Successor  Predecessor
 Year Ended December 31, July 1, 2016 through December 31,  January 1, 2016 through June 30, Year Ended December 31,
 2017 2016  2016 2015
 (in millions)  (in millions)
Operating Income$665
 $197
  $321
 $746
Other operating expenses(a)
1,625
 832
  815
 1,550
Revenue tax expense(b)
(98) (31)  (56) (101)
Adjusted Operating Margin$2,192
 $998
  $1,080
 $2,195
(a)Includes other operations and maintenance, depreciation and amortization, taxes other than income taxes, and Merger-related expenses.
(b)Nicor Gas' revenue tax expenses, which are passed through directly to customers.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


 Successor  Predecessor
 Year Ended December 31, July 1, 2016 through December 31,  January 1, 2016 through June 30, Year Ended December 31,
 2017 2016  2016 2015
 (in millions)  (in millions)
Net Income Attributable to Southern Company Gas$243
 $114
  $131
 $353
Net income attributable to noncontrolling interest
 
  14
 20
Income taxes367
 76
  87
 213
Interest expense, net of amounts capitalized200
 81
  96
 175
EBIT$810
 $271
  $328
 $761
Segment Information
Adjusted operating margin, operating expenses, and the Company's primary performance metric for each segment are illustrated in the tables below.
  Successor
  Year ended December 31, 2017 July 1, 2016 through December 31, 2016
  
 Adjusted Operating Margin(*)
 
Operating Expenses(*)
 Net Income 
Adjusted Operating Margin(*)
 
Operating Expenses(*)
 Net Income
  (in millions) (in millions)
Gas distribution operations $1,834
 $1,184
 $353
 $817
 $595
 $77
Gas marketing services 313
 200
 84
 139
 112
 19
Wholesale gas services 5
 56
 (57) 24
 26
 
Gas midstream operations 42
 52
 3
 19
 26
 20
All other 10
 47
 (140) 3
 46
 (2)
Intercompany eliminations (12) (12) 
 (4) (4) 
Consolidated $2,192
 $1,527
 $243
 $998
 $801
 $114
(*)Adjusted operating margin and operating expenses are adjusted for Nicor Gas revenue tax expenses, which are passed through directly to customers.
  Predecessor
  January 1, 2016 through June 30, 2016 Year ended December 31, 2015
  
Adjusted Operating Margin(*)
 
Operating Expenses(*)
 EBIT 
Adjusted Operating Margin(*)
 
Operating Expenses(*)
 EBIT
  (in millions) (in millions)
Gas distribution operations $911
 $560
 $353
 $1,657
 $1,086
 $581
Gas marketing services 190
 81
 109
 317
 165
 152
Wholesale gas services (36) 33
 (68) 183
 71
 110
Gas midstream operations 15
 24
 (6) 36
 62
 (23)
All other 4
 65
 (60) 7
 70
 (59)
Intercompany eliminations (4) (4) 
 (5) (5) 
Consolidated $1,080
 $759
 $328
 $2,195
 $1,449
 $761
(*)Adjusted operating margin and operating expenses are adjusted for Nicor Gas revenue tax expenses, which are passed through directly to customers.
Gas Distribution Operations
Gas distribution operations is the largest component of the Company's business and is subject to regulation and oversight by agencies in each of the states it serves. These agencies approve natural gas rates designed to provide the Company with the
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


opportunity to generate revenues to recover the cost of natural gas delivered to its customers and its fixed and variable costs, including depreciation, interest, maintenance, taxes, and overhead costs, and to earn a reasonable return on its investments.
With the exception of Atlanta Gas Light, the Company's second largest utility that operates in a deregulated natural gas market and has a straight-fixed-variable rate design that minimizes the variability of its revenues based on consumption, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are a function of weather conditions, price levels for natural gas, and general economic conditions that may impact customers' ability to pay for natural gas consumed. The Company has various weather mechanisms, such as weather normalization mechanisms and weather derivative instruments, that limit its exposure to weather changes within typical ranges in its natural gas distribution utilities' service territories.
Successor Year Ended December 31, 2017
Net income of $353 million includes $1.8 billion in adjusted operating margin, $1.2 billion in operating expenses, and $34 million in other income (expense), net, which resulted in EBIT of $684 million. Net income also includes $153 million in interest expense, net of amounts capitalized and $178 million in income tax expense. Adjusted operating margin reflects $99 million in additional revenue from continued investment in infrastructure replacement programs and base rate increases at Atlanta Gas Light, Elizabethtown Gas, and Virginia Natural Gas. Adjusted operating margin was also affected by increased customer growth, partially offset by the negative impact of warmer-than-normal weather, net of hedging. Operating expenses reflect a $28 million increase in depreciation associated with additional assets placed in service, as well as benefit and compensation costs, legal expenses, and pipeline compliance and maintenance expenses. Other income (expense), net reflects a $20 million gain from the settlement of contractor litigation claims. Interest expense reflects the impact of intercompany promissory notes executed in December 2016 and the issuance of first mortgage bonds at Nicor Gas on August 10, 2017 and November 1, 2017. Income tax expense includes a $22 million benefit as a result of the Tax Reform Legislation.
See Note 3 to the financial statements under "Regulatory Matters – PRP Settlement" for additional information on contractor litigation claims. See FINANCIAL CONDITION AND LIQUIDITY – "Financing Activities" herein and Note 6 to the financial statements for additional information on debt issuances. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Note 5 to the financial statements for additional information.
Successor Period of July 1, 2016 through December 31, 2016
Net income of $77 million includes $817 million in adjusted operating margin, $595 million in operating expenses, and $11 million in other income (expense), net, resulting in EBIT of $233 million. Net income also includes $105 million in interest expense, net of amounts capitalized and $51 million in income tax expense. Adjusted operating margin reflects revenue from continued investment in infrastructure replacement programs, partially offset by the impact of warm weather, net of hedging. Operating expenses reflect the depreciation associated with additional assets placed in service, the related expenses associated with pipeline compliance and maintenance activities, and $18 million of rate credits provided to the customers of Elizabethtown Gas and Elkton Gas as conditions of the Merger. See Note 11 to the financial statements under "Merger with Southern Company" for additional information.
Predecessor Period of January 1, 2016 through June 30, 2016
EBIT of $353 million includes $911 million in adjusted operating margin, $560 million in operating expense, and $2 million in other income (expense), net. Adjusted operating margin reflects increased revenue from continued investment in infrastructure replacement programs and the impact of customer usage and growth, partially offset by the impact of warm weather, net of hedging. Operating expenses reflect the depreciation associated with additional assets placed in service.
Predecessor Year Ended December 31, 2015
EBIT of $581 million includes $1.7 billion in adjusted operating margin, $1.1 billion in operating expense, and $10 million in other income (expense), net. Adjusted operating margin reflects revenue from the continued investment in infrastructure replacement programs, the impact of customer usage and growth, and the impact of warm weather, net of hedging. Operating expenses reflect the depreciation associated with additional assets placed in service, as well as benefits and compensation costs.
Gas Marketing Services
Gas marketing services consists of several businesses that provide energy-related products and services to natural gas markets, including warranty sales. Gas marketing services is weather sensitive and uses a variety of hedging strategies, such as weather derivative instruments and other risk management tools, to partially mitigate potential weather impacts. Operating expenses primarily reflect employee costs, marketing, customer care, and bad debt expenses.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Successor Year Ended December 31, 2017
Net income of $84 million includes $313 million in adjusted operating margin and $200 million in operating expenses, which resulted in EBIT of $113 million. Net income also includes $5 million in interest expense, net of amounts capitalized and $24 million in income tax expense. Adjusted operating margin reflects a $9 million negative impact of warmer-than-normal weather, net of hedging, and $4 million in unrealized hedge losses, net of recoveries. Operating expenses includes $40 million in additional amortization of intangible assets established in the application of acquisition accounting. Income tax expense includes a $19 million benefit as a result of the Tax Reform Legislation. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Note 5 to the financial statements for additional information.
Successor Period of July 1, 2016 through December 31, 2016
Net income of $19 million includes $139 million in adjusted operating margin and $112 million in operating expenses, resulting in EBIT of $27 million. Net income also includes $1 million in interest expense, net of amounts capitalized and $7 million in income tax expense. Adjusted operating margin reflects a reduction of $5 million due to fair value adjustments to certain assets and liabilities in the application of acquisition accounting. Also reflected in adjusted operating margin are unrealized hedge gains and LOCOM adjustments. Operating expenses reflect $23 million in additional amortization of intangible assets, partially offset by a $2 million reduction in operations and maintenance expense due to fair value adjustments to certain assets and liabilities in the application of acquisition accounting. See Note 1 to the financial statements under "Natural Gas for Sale" for additional information on LOCOM adjustments and Note 11 to the financial statements for additional information on the Merger.
Predecessor Period of January 1, 2016 through June 30, 2016
EBIT of $109 million includes $190 million in adjusted operating margin and $81 million in operating expenses. Adjusted operating margin reflects $9 million in unrealized hedge gains. Operating expenses reflect lower bad debt, marketing, and depreciation and amortization, compared to the same period in the prior year. Earnings also include $14 million attributable to noncontrolling interest.
Predecessor Year Ended December 31, 2015
EBIT of $152 million includes $317 million in adjusted operating margin and $165 million in operating expenses. Adjusted operating margin reflects revenue from gas marketing and warranty sales, which were partially offset by the impact of warm weather, net of hedging. Operating expenses primarily reflect compensation and benefits costs. Earnings also include $20 million attributable to noncontrolling interest.
Wholesale Gas Services
Wholesale gas services is involved in asset management and optimization, storage, transportation, producer and peaking services, natural gas supply, natural gas services, and wholesale gas marketing. The Company has positioned the business to generate positive economic earnings on an annual basis even under low volatility market conditions that can result from a number of factors. When market price volatility increases, wholesale gas services is well positioned to capture significant value and generate stronger results. Wholesale gas services generated positive economic results for the successor year ended December 31, 2017, primarily reflecting lower volatility market conditions throughout the majority of 2017 and higher volatility along with the widening of locational and transportation spreads in December 2017 due to colder weather, as well as higher natural gas storage value resulting from higher natural gas prices.
Successor Year Ended December 31, 2017
Net loss of $57 million includes $5 million in adjusted operating margin, $56 million in operating expenses, and $1 million in other income (expense), net, which resulted in a loss before interest and taxes of $50 million. Also included are $7 million in interest expense, net of amounts capitalized. Adjusted operating margin reflects a decrease of $21 million due to fair value adjustments to certain assets and liabilities in the application of acquisition accounting. Also reflected in adjusted operating margin is revenue from commercial activity partially offset by mark-to-market losses. Income tax expense includes $21 million resulting from the revaluation of deferred income tax assets associated with the Tax Reform Legislation. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Note 5 to the financial statements for additional information on income taxes.
Successor Period of July 1, 2016 through December 31, 2016
Net income includes $24 million in adjusted operating margin, $26 million in operating expenses, and $2 million in other income (expense), net, resulting in no EBIT. Also included are $3 million in interest expense, net of amounts capitalized and $3 million in income tax benefit. Adjusted operating margin reflects a decrease of $5 million due to fair value adjustments to certain assets and
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


liabilities in the application of acquisition accounting. Also reflected in adjusted operating margin are mark-to-market gains due to changes in natural gas prices in the fourth quarter 2016 and losses from commercial activity due to low volatility in natural gas prices and warm weather. Operating expenses reflect low incentive compensation expense due to low earnings.
Predecessor Period of January 1, 2016 through June 30, 2016
Loss before interest and taxes of $68 million includes $(36) million in adjusted operating margin, $33 million in operating expense, and $1 million in other income (expense), net. Adjusted operating margin reflects mark-to-market losses and LOCOM adjustments as a result of changes in natural gas prices and revenues from commercial activity driven by changes in price volatility. Operating expenses reflect lower incentive compensation expense as compared to the same period in the prior year due to lower earnings.
Predecessor Year Ended December 31, 2015
EBIT of $110 million includes $183 million in adjusted operating margin, $71 million in operating expenses, and $(2) million in other income (expense), net. Adjusted operating margin reflects revenue from commercial activity driven by changes in price volatility, mark-to-market gains, and LOCOM adjustments as a result of changes in natural gas prices.
The following table illustrates the components of wholesale gas services' adjusted operating margin for the periods presented:
 Successor  Predecessor
 Year Ended December 31, July 1, 2016 through December 31,  January 1, 2016 through June 30, Year Ended December 31,
 2017  2016  2016 2015
 (in millions)  (in millions)
Commercial activity recognized$116
 $(15)  $34
 $140
Gain (loss) on storage derivatives23
 (20)  (38) 45
Gain (loss) on transportation and forward
commodity derivatives
(113) 64
  (31) 11
LOCOM adjustments, net of current period recoveries
 
  (1) (13)
Purchase accounting adjustments to fair value
inventory and contracts
(21) (5)  
 
Adjusted operating margin$5
 $24
  $(36) $183
Change in Commercial Activity
The commercial activity at wholesale gas services includes recognition of storage and transportation values that were generated in prior periods, which reflect the impact of prior period hedge gains and losses as associated physical transactions occur. Warmer-than-normal weather during the 2016/2017 Heating Season, lower power generation volumes, and build-out of new U.S. pipeline infrastructure, along with increases in natural gas supply, caused low volatility and a tightening of locational or transportation spreads throughout the majority of 2017, negatively impacting the amount of commercial activity revenues generated relative to demand fees for contracted pipeline transportation and storage capacity, and minimum sharing under asset management agreements. However, during December 2017, significantly colder weather increased natural gas price volatility and transportation spreads widened, enabling wholesale gas services to capture higher commercial activity. Further, as natural gas prices and forward storage or time spreads increased, wholesale gas services was able to capture higher storage values that it expects to recognize as commercial activity revenues when natural gas is physically withdrawn from storage.
Change in Storage and Transportation Derivatives
Volatility in the natural gas market arises from a number of factors, such as weather fluctuations or changes in supply or demand for natural gas in different regions of the U.S. The volatility of natural gas commodity prices has a significant impact on the Company's customer rates, long-term competitive position against other energy sources, and the ability of wholesale gas services to capture value from locational and seasonal spreads. Transportation and forward commodity derivative losses are primarily the result of widening transportation spreads during the fourth quarter 2017 due to significantly colder weather in the Northeast and Midwest U.S., which impacted forward prices at natural gas receipt and delivery points. Additionally, during 2017, forward storage or time spreads applicable to the locations of wholesale gas services' specific storage positions resulted in storage derivative gains.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


The natural gas that the Company purchases and injects into storage is accounted for at the LOCOM value utilizing gas daily or spot prices at the end of the year. Wholesale gas services recorded LOCOM adjustments of $19 million for the predecessor year ended December 31, 2015. LOCOM adjustments for all other periods presented were immaterial. See Note 1 to the financial statements under "Natural Gas for Sale" for additional information.
Withdrawal Schedule and Physical Transportation Transactions
The expected natural gas withdrawals from storage and expected offset to prior hedge losses/gains associated with the transportation portfolio of wholesale gas services are presented in the following table, along with the net operating revenues expected at the time of withdrawal from storage and the physical flow of natural gas between contracted transportation receipt and delivery points. Wholesale gas services' expected net operating revenues exclude storage and transportation demand charges, as well as other variable fuel, withdrawal, receipt, and delivery charges, but are net of the estimated impact of profit sharing under its asset management agreements. Further, the amounts that are realizable in future periodsmeasurements are based on the inventory withdrawal schedule, planned physical flowinputs of natural gas between the transportation receiptobservable and delivery points, and forward natural gas prices at December 31, 2017. A portion of wholesale gas services' storage inventory and transportation capacity is economically hedged with futures contracts, which results in the realization of substantially fixed net operating revenues.
 Storage Withdrawal  
 
Total storage
(WACOG $2.66)
 
Expected net operating gains(a)
 
Physical Transportation Transactions – Expected Net Operating Gains(b)
 (in mmBtu in millions) (in millions) (in millions)
201855.2
 $14
 $70
2019 and thereafter2.3
 1
 43
Total at December 31, 201757.5
 $15
 $113
(a)Represents expected operating gains from planned storage withdrawals associated with existing inventory positions and could change as wholesale gas services adjusts its daily injection and withdrawal plans in response to changes in future market conditions and forward NYMEX price fluctuations. Also includes the impact of purchase accounting adjustments to reflect natural gas storage inventory at market value. Excluding the impact of these adjustments, the expected net operating gains at December 31, 2017 would have been $22 million.
(b)Represents the periods associated with the transportation derivative (gains) and losses during which the derivatives will be settled and the physical transportation transactions will occur that offset the derivative losses that were previously recognized.
Gas Midstream Operations
Gas midstream operations consists primarily of gas pipeline investments, with storage and fuels also aggregated into this segment. Gas pipeline investments include SNG, Horizon Pipeline, Atlantic Coast Pipeline, PennEast Pipeline, Dalton Pipeline, and Magnolia Enterprise Holdings, Inc. See Note 4 to the financial statements under "Equity Method Investments" for additional information.
Successor Year Ended December 31, 2017
Net income of $3 million includes $42 million in adjusted operating margin, $52 million in operating expenses, $103 million in earnings from equity method investments, consisting primarily of the Company's equity interest in SNG, including $33 million related to a non-cash charge recorded by SNG to establish a regulatory liability associated with the Tax Reform Legislation, and $4 million in other income, which resulted in EBIT of $97 million. Also included in net income are $33 million in interest expense, net of amounts capitalized and $61 million in income tax expense. Income tax expense includes $27 million resulting from the revaluation of deferred income tax assets associated with the Tax Reform Legislation and $8 million related to the allocation of new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Note 5 to the financial statements for additional information on income taxes.
Successor Period of July 1, 2016 through December 31, 2016
Net income of $20 million includes $19 million in adjusted operating margin, $26 million in operating expenses, $58 million in earnings from equity method investments, consisting primarily of the Company's September 2016 acquired equity interest in SNG, and $1 million in other income, resulting in EBIT of $52 million. Also included in net income are $16 million in interest expense, net of amounts capitalized and $16 million in income tax expense.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Predecessor Periods of January 1, 2016 through June 30, 2016 and the Year Ended December 31, 2015
Loss before interest and taxes for the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015 were $6 million and $23 million, respectively, and reflected a $14 million goodwill impairment charge in 2015.
All Other
All other includes the Company's investment in Triton, AGL Services Company, and Southern Company Gas Capital, as well as various corporate operating expenses that are not allocated to the reportable segments and interest income (expense) associated with affiliate financing arrangements.
Successor Year Ended December 31, 2017
Net loss of $140 million includes $10 million in adjusted operating margin and $47 million in operating expenses. Operating expenses included $26 million of integration-related costs. Interest expense, net of amounts capitalized was $2 million due to the intercompany promissory notes that were executed in December 2016. Income tax expense was $104 million and includes $86 million resulting from the revaluation of deferred tax assets associated with the Tax Reform Legislation and $29 million associated with State of Illinois tax legislation enacted during the third quarter 2017 and new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings. See FINANCIAL CONDITION AND LIQUIDITY – "Financing Activities" herein for additional financing information and FUTURE EARNINGS POTENTIAL – "Income Tax Matters" herein and Note 5 to the financial statements for additional information on income taxes.
Successor Period of July 1, 2016 through December 31, 2016
Operating expenses included Merger-related expenses of $41 million primarily comprised of compensation-related expenses, financial advisory fees, legal expenses, and other Merger-related costs and $8 million in expenses associated with certain benefit arrangements.
Predecessor Periods of January 1, 2016 through June 30, 2016 and the Year Ended December 31, 2015
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, operating expenses included Merger-related expenses of $56 million and $44 million, respectively. These expenses are primarily comprised of financial advisory and legal expenses as well as additional compensation-related expenses, including acceleration of share-based compensation expenses, and change-in-control compensation charges. See Note 11 to the financial statements under "Merger with Southern Company" for additional information.
Segment Reconciliations
Reconciliations of net income attributable to Southern Company Gas to EBIT for the year ended December 31, 2017 and the period of July 1, 2016 through December 31, 2016, and operating income to adjusted operating margin for all periods presented, are in the following tables. See Note 12 to the financial statements for additional segment information.
 Successor
 Year Ended December 31, 2017
 Gas Distribution OperationsGas Marketing ServicesWholesale Gas ServicesGas Midstream OperationsAll OtherIntercompany EliminationConsolidated
 (in millions)
Net Income (Loss) Attributable
to Southern Company Gas
$353
$84
$(57)$3
$(140)$
$243
Income taxes178
24

61
104

367
Interest expense, net of amounts
capitalized
153
5
7
33
2

200
EBIT$684
$113
$(50)$97
$(34)$
$810
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


 Successor
 July 1, 2016 through December 31, 2016
 Gas Distribution OperationsGas Marketing ServicesWholesale Gas ServicesGas Midstream OperationsAll OtherIntercompany EliminationConsolidated
 (in millions)
Net Income (Loss) Attributable
to Southern Company Gas
$77
$19
$
$20
$(2)$
$114
Income taxes (benefit)51
7
(3)16
5

76
Interest expense, net of amounts
capitalized
105
1
3
16
(44)
81
EBIT$233
$27
$
$52
$(41)$
$271
 Successor
 Year Ended December 31, 2017
 Gas Distribution OperationsGas Marketing ServicesWholesale Gas ServicesGas Midstream OperationsAll OtherIntercompany EliminationConsolidated
 (in millions)
Operating Income (Loss)$650
$113
$(51)$(10)$(37)$
$665
Other operating expenses(a)
1,282
200
56
52
47
(12)1,625
Revenue tax expense(b)
(98)




(98)
Adjusted Operating Margin 
$1,834
$313
$5
$42
$10
$(12)$2,192
 Successor
 July 1, 2016 through December 31, 2016
 Gas Distribution OperationsGas Marketing ServicesWholesale Gas ServicesGas Midstream OperationsAll OtherIntercompany EliminationConsolidated
 (in millions)
Operating Income (Loss)$222
$27
$(2)$(7)$(43)$
$197
Other operating expenses(a)
626
112
26
26
46
(4)832
Revenue tax expense(b)
(31)




(31)
Adjusted Operating Margin 
$817
$139
$24
$19
$3
$(4)$998
 Predecessor
 January 1, 2016 through June 30, 2016
 Gas Distribution OperationsGas Marketing ServicesWholesale Gas ServicesGas Midstream OperationsAll OtherIntercompany EliminationConsolidated
 (in millions)
Operating Income (Loss)$351
$109
$(69)$(9)$(61)$
$321
Other operating expenses(a)
616
81
33
24
65
(4)815
Revenue tax expense(b)
(56)




(56)
Adjusted Operating Margin 
$911
$190
$(36)$15
$4
$(4)$1,080
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


 Predecessor
 Year Ended December 31, 2015
 Gas Distribution OperationsGas Marketing ServicesWholesale Gas ServicesGas Midstream OperationsAll OtherIntercompany EliminationConsolidated
 (in millions)
Operating Income (Loss)$571
$152
$112
$(26)$(63)$
$746
Other operating expenses(a)
1,187
165
71
62
70
(5)1,550
Revenue tax expense(b)
(101)




(101)
Adjusted Operating Margin 
$1,657
$317
$183
$36
$7
$(5)$2,195
(a)Includes other operations and maintenance, depreciation and amortization, taxes other than income taxes, goodwill impairment in 2015, and Merger-related expenses.
(b)Nicor Gas' revenue tax expenses, which are passed through directly to customers.
FUTURE EARNINGS POTENTIAL
General
The results of operations for the past three years are not necessarily indicative of future earnings potential. The level of the Company's future earnings depends on numerous factors that affect the opportunities, challenges, and risks of the Company's primary business of natural gas distribution and its complementary businesses in the gas marketing services, wholesale gas services, and gas midstream operations sectors. These factors include the Company's ability to maintain a constructive regulatory environment that allows for the timely recovery of prudently-incurred costs, the completion and subsequent operation of ongoing infrastructure and other construction projects, creditworthiness of customers, the Company's ability to optimize its transportation and storage positions, and its ability to re-contract storage rates at favorable prices.
Future earnings will be driven primarily by customer growth and are subject to a variety of other factors. These factors include weather, competition, new energy contracts with other utilities and other wholesale customers, energy conservation practiced by customers, the use of alternative energy sources by customers, the price of natural gas, the price elasticity of demand, and the rate of economic growth or decline in the Company's service territories. Demand for natural gas is primarily driven by the pace of economic growth that may be affected by changes in regional and global economic conditions, which may impact future earnings.
Volatility of natural gas prices has a significant impact on the Company's customer rates, long-term competitive position against other energy sources, and the ability of its gas marketing services and wholesale gas services segments to capture value from locational and seasonal spreads. Additionally, changes in commodity prices subject a significant portion of the Company's operations to earnings variability. Over the longer term, volatility is expected to be low to moderate and locational and/or transportation spreads are expected to decrease as new pipelines are built to reduce the existing supply constraints in the shale areas of the Northeast U.S. To the extent these pipelines are delayed or not built, volatility could increase. Additional economic factors may contribute to this environment, including a significant drop in oil and natural gas prices, which could lead to consolidation of natural gas producers or reduced levels of natural gas production. Further, if economic conditions continue to improve, including the new housing market, the demand for natural gas may increase, which may cause natural gas prices to rise and drive higher volatility in the natural gas markets on a longer-term basis.
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018, which among other things, reduces the federal corporate income tax rate to 21% and changes rates of depreciation and the business interest deduction. On July 6, 2017, the State of Illinois enacted tax legislation that repealed its non-combination tax rule and increased the effective corporate income tax rate effective July 1, 2017. In addition, Southern Company calculated new apportionment factors in several states to include the Company in its consolidated tax filings. See "Income Tax Matters" and FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Notes 3 and 5 to the financial statements for additional information.
As part of its business strategy, the Company regularly considers and evaluates joint development arrangements as well as acquisitions and dispositions of businesses and assets. On October 15, 2017, the Company's subsidiary Pivotal Utility Holdings entered into agreements for the sale of the assets of two of its natural gas distribution utilities, Elizabethtown Gas and Elkton Gas, to South Jersey Industries, Inc.; the asset sales are expected to be completed by the end of the third quarter 2018. Net income attributable to Elizabethtown Gas and Elkton Gas for the year ended December 31, 2017 was $34 million. However, due to the seasonal nature of the natural gas business and other factors including, but not limited to, weather, regulation, competition,
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


customer demand, and general economic conditions, the 2017 net income is not necessarily indicative of the results to be expected for any other period. See BUSINESS – "Seasonality" in Item 1, RISK FACTORS in Item 1A, and Note 11 to the financial statements under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for additional information.
Environmental Matters
The Company's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, and protection of other natural resources. The Company maintains a comprehensive environmental compliance strategy to assess upcoming requirements and compliance costs associated with these environmental laws and regulations. The costs, including capital expenditures and operations and maintenance costs, required to comply with environmental laws and regulations may impact future results of operations, cash flows, and financial condition. A major portion of these compliance costs are expected to be recovered through existing ratemaking provisions. The ultimate impact of the environmental laws and regulations discussed below will depend on various factors, such as state adoption and implementation of requirements and the outcome of pending and/or future legal challenges.
New or revised environmental laws and regulations could affect many areas of the Company's operations. The impact of any such changes cannot be determined at this time. Environmental compliance costs could affect earnings if such costs cannot continue to be fully recovered in rates on a timely basis. Further, increased costs that are recovered through regulated rates could contribute to reduced demand for natural gas, which could negatively affect results of operations, cash flows, and financial condition. Additionally, many commercial and industrial customers may also be affected by existing and future environmental requirements, which for some may have the potential to ultimately affect their demand for natural gas. See Note 3 to the financial statements under "Environmental Matters" for additional information.
Environmental Remediation
The Company is subject to environmental remediation liabilities associated with 46 former MGP sites in five different states. The Company conducts studies to determine the extent of any required cleanup and has recognized the costs to clean up known impacted sites in its financial statements. Accrued environmental remediation costs totaling $388 million were included in the balance sheets at December 31, 2017, $46 million of which is expected to be incurred over the next 12 months. The natural gas distribution utilities in Illinois, New Jersey, Georgia, and Florida have all received authority from their respective state regulators to recover approved environmental compliance costs through regulatory mechanisms, which covers substantially all of the total accrued remediation costs. See FINANCIAL CONDITION AND LIQUIDITY – "Capital Requirements and Contractual Obligations" herein for additional information.
Water Quality
In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) jointly published a final rule that revised the regulatory definition of waters of the United States (WOTUS) for all Clean Water Act programs. The rule significantly expanded the scope of federal jurisdiction over waterbodies (such as rivers, streams, and canals), which could impact permitting and reporting requirements associated with the installation, expansion, and maintenance of pipeline projects. On July 27, 2017, the EPA and the Corps proposed to rescind the 2015 WOTUS rule. The WOTUS rule has been stayed by the U.S. Court of Appeals for the Sixth Circuit since late 2015, but on January 22, 2018, the U.S. Supreme Court determined that federal district courts have jurisdiction over the pending challenges to the rule. On February 6, 2018, the EPA and the Corps published a final rule delaying implementation of the 2015 WOTUS rule to 2020.
FERC Matters
The Company is involved in two significant pipeline construction projects within gas midstream operations. These projects, along with the Company's existing pipelines, are intended to provide diverse sources of natural gas supplies to customers, resolve current and long-term supply planning for new capacity, enhance system reliability, and generate economic development in the areas served. The following table provides an overview of these pipeline projects.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


 Miles of Pipe Capital
Expenditures
 Ownership
Interest
   (in millions)  
Atlantic Coast Pipeline(a)(b)
594
 $310
 5%
PennEast Pipeline(a)(c)
118
 276
 20%
Total712
 $586
  
(a)Represents the Company's expected capital expenditures and ownership interest, which may change.
(b)In 2014, the Company entered into a joint venture to construct and operate a natural gas pipeline that will run from West Virginia through Virginia and into eastern North Carolina to meet the region's growing demand for natural gas. The proposed pipeline project is expected to transport natural gas to customers in Virginia. On October 13, 2017, the Atlantic Coast Pipeline project received FERC approval. The joint venture continues to work with state and other federal agencies to obtain the required environmental permits to begin construction.
(c)In 2014, the Company entered into a joint venture to construct and operate a natural gas pipeline that will transport low-cost natural gas from the Marcellus Shale area to customers in New Jersey. The Company believes this will alleviate takeaway constraints in the Marcellus region and help mitigate some of the price volatility experienced during recent winters. On January 19, 2018, the PennEast Pipeline project received FERC approval. The joint venture continues to work with state and other federal agencies to obtain the required environmental permits to begin construction.
On August 1, 2017, the Dalton Pipeline, which serves as an extension of the Transco pipeline system and provides additional natural gas supply to customers in Georgia, was placed in service. The Company has a 50% ownership interest in the Dalton Pipeline. See Note 4 to the financial statements for additional information.
On January 16, 2018, the Georgia PSC approved SNG's purchase of Georgia Power Company's natural gas lateral pipeline serving Plant McDonough Units 4 through 6 at net book value. Pursuant to this approval, legal transfer of the lateral pipeline is expected to occur in the fourth quarter 2018 and payment of $142 million is expected to occur in the first quarter 2020. During this interim period, Georgia Power Company will receive a discounted shipping rate to reflect the delayed consideration. Completion of this sale is contingent on certain conditions being satisfied by SNG that include, among other things, expansion of the existing lateral pipeline. The Company's portion of the expected capital expenditures for this project is $120 million. On February 15, 2018, FERC approval was obtained. The ultimate outcome of this matter cannot be determined at this time.
Regulatory Matters
Utility Regulation and Rate Design
The natural gas distribution utilities are subject to regulations and oversight by their respective state regulatory agencies for the rates charged to their customers, maintenance of accounting records, and various service and safety matters. Rates charged to customers vary according to customer class (residential, commercial, or industrial) and rate jurisdiction. These agencies approve rates designed to provide the opportunity to generate revenues to recover all prudently-incurred costs, including a return on rate base sufficient to pay interest on debt and provide a reasonable ROE. Rate base generally consists of the original cost of the utility plant in service, working capital, and certain other assets, less accumulated depreciation on the utility plant in service and net deferred income tax liabilities, and may include certain other additions or deductions.
The natural gas market for Atlanta Gas Light was deregulated in 1997. Accordingly, Marketers, rather than a traditional utility, sell natural gas to end-use customers in Georgia and handle customer billing functions. The Marketers file their rates monthly with the Georgia PSC. As a result of operating in a deregulated environment, Atlanta Gas Light's role includes:
distributing natural gas for Marketers;
constructing, operating, and maintaining the gas system infrastructure, including responding to customer service calls and leaks;
reading meters and maintaining underlying customer premise information for Marketers; and
planning and contracting for capacity on interstate transportation and storage systems.
Atlanta Gas Light earns revenue by charging rates to its customers based primarily on monthly fixed charges that are set by the Georgia PSC and adjusted periodically. The Marketers add these fixed charges when billing customers. This mechanism, called a straight-fixed-variable rate design, minimizes the seasonality of Atlanta Gas Light's revenues since the monthly fixed charge is not volumetric or directly weather dependent.
With the exception of Atlanta Gas Light, the earnings of the natural gas distribution utilities can be affected by customer consumption patterns that are largely a function of weather conditions and price levels for natural gas. Specifically, customer demand substantially increases during the Heating Season when natural gas is used for heating purposes. The Company has various mechanisms, such as weather normalization mechanisms and weather derivative instruments, at most of its utilities that limit exposure to weather changes within typical ranges in these utilities' respective service territories.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


With the exception of Atlanta Gas Light, the natural gas distribution utilities are authorized by the relevant regulatory agencies in the states in which they serve to use natural gas cost recovery mechanisms that adjust rates to reflect changes in the wholesale cost of natural gas and ensure recovery of all costs prudently incurred in purchasing natural gas for customers. Since Atlanta Gas Light does not sell natural gas directly to its end-use customers, it does not utilize a traditional natural gas cost recovery mechanism. However, Atlanta Gas Light does maintain natural gas inventory for the Marketers in Georgia and recovers the cost through recovery mechanisms approved by the Georgia PSC specific to Georgia's deregulated market. In addition to natural gas recovery mechanisms, there are other cost recovery mechanisms, such as regulatory riders, which vary by utility but allow recovery of certain costs, such as those related to infrastructure replacement programs as well as environmental remediation and energy efficiency plans. In traditional rate designs, utilities recover a significant portion of the fixed customer service and pipeline infrastructure costs based on assumed natural gas volumes used by customers. Three of the utilities have decoupled regulatory mechanisms that the Company believes encourage conservation by separating the recoverable amount of these fixed costs from the amounts of natural gas used by customers. Natural gas cost recovery revenues are adjusted for differences in actual recoverable natural gas costs and amounts billed in current regulated rates. Changes in the billing factor will not have a significant effect on the Company's revenues or net income, but will affect cash flows. See Note 3 to the financial statements under "Regulatory Matters" for additional information.
The following table provides regulatory information for the Company's six largest natural gas distribution utilities:
 Nicor Gas Atlanta Gas Light Elizabethtown Gas Virginia Natural Gas Florida City Gas Chattanooga Gas
Authorized ROE(a)(b)
9.80% 10.75% 9.60% 9.50% 11.25% 10.05%
Weather normalization(c)
    ü ü   ü
Decoupled, including straight-fixed-
variable rates
(d)
  ü   ü   ü
Regulatory infrastructure program
rates
(e)
ü 
 
 ü ü  
Bad debt rider(f)
ü     ü   ü
Energy efficiency plan(g)
ü   ü ü ü ü
Last decision on change in rates(h)
2018 2017 2017 2017 2004 2010
(a)Represents the authorized ROE, or the midpoint of the authorized ROE range, at December 31, 2017, except Nicor Gas which represents the authorized ROE established in the January 31, 2018 order issued by the Illinois Commission. The authorized ROE of Nicor Gas at December 31, 2017 was 10.17%. See "Base Rate Cases" herein and Note 3 to the financial statements under "Regulatory Matters – Base Rate Cases" for additional information.
(b)The authorized ROE range for Atlanta Gas Light, Virginia Natural Gas, and Florida City Gas was 10.55% - 10.95%, 9.00% - 10.00%, and 10.25% - 12.25%, respectively, at December 31, 2017.
(c)Regulatory mechanisms that allow recovery of costs in the event of unseasonal weather, but are not direct offsets to the potential impacts on earnings of weather and customer consumption. These mechanisms are designed to help stabilize operating results by increasing base rate amounts charged to customers when weather is warmer than normal and decreasing amounts charged when weather is colder than normal.
(d)Recovery of fixed customer service costs separately from assumed natural gas volumes used by customers.
(e)Programs that update or expand distribution systems and LNG facilities.
(f)The recovery (refund) of bad debt expense over (under) an established benchmark expense. Virginia Natural Gas and Chattanooga Gas recover the gas portion of bad debt expense through their purchased gas adjustment mechanisms.
(g)Recovery of costs associated with plans to achieve specified energy savings goals.
(h)See "Base Rate Cases" herein and Note 3 to the financial statements under "Regulatory Matters – Base Rate Cases" for additional information.
Infrastructure Replacement Programs and Capital Projects
The Company continues to focus on capital discipline and cost control while pursuing projects and initiatives that are expected to have current and future benefits to customers, provide an appropriate return on invested capital, and help ensure the safety and reliability of the utility infrastructure.Total capital expenditures incurred during 2017 for gas distribution operations were $1.3 billion. The following table and discussions provide updates on the infrastructure replacement programs at the natural gas distribution utilities, which are designed to update or expand the Company's distribution systems to improve reliability and meet operational flexibility and growth. The anticipated expenditures for these programs in 2018 are quantified in the discussion below.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Utility Program Program Details Recovery Expenditures in 2017 Expenditures Since Project Inception Miles of Pipe
Installed Since
Project Inception
 Scope of
Program
 Program Duration Last
Year of Program
        (in millions)   (miles) (years)  
Nicor Gas Investing in Illinois 
(a)(b) 
 Rider $336
 $907
 516
 800
 9
 2023
Atlanta Gas Light Integrated Vintage Plastic Replacement Program
(i-VPR)
 
(c)(i) 
 Base Rates 50
 251
 782
 756
 4
 2017
Atlanta Gas Light Integrated System Reinforcement Program
(i-SRP)
 
(g)(i) 
 Base Rates 76
 446
 n/a
 n/a
 8
 2017
Atlanta Gas Light Integrated Customer Growth Program
(i-CGP)
 
(h)(i) 
 Base Rates 18
 89
 n/a
 n/a
 8
 2017
Chattanooga Gas Bare Steel & Cast Iron 
(e) 
 Base Rates 3
 43
 94
 111
 10
 2020
Florida City Gas Safety, Access and Facility Enhancement Program (SAFE) 
(d) 
 Rider 10
 21
 64
 250
 10
 2025
Florida City Gas Galvanized Replacement Program 
(f) 
 Base Rates 
 16
 80
 111
 17
 2017
Virginia Natural Gas Steps to Advance Virginia's Energy (SAVE and SAVE II) 
(a) 
 Rider 34
 156
 255
 496
 10
 2021
Elizabethtown Gas Aging Infrastructure Replacement (AIR) 
(e) 
 Base Rates 16
 115
 96
 130
 4
 2017
Total       $543
 $2,044
 1,887
 2,654
    
(a)Replacement of cast iron, bare steel, mid-vintage plastic, and risk-based materials.
(b)Represents expenditures on qualifying infrastructure placed into service after December 9, 2014.
(c)Replacement of early vintage plastic, risk-based mid-vintage plastic, and mid-vintage neighborhood convenience.
(d)Replacement of four-inch and smaller mains, associated service lines, and in some instances above-ground facilities associated with rear-lot easements.
(e)Replacement of cast iron and bare steel pipes.
(f)Replacement of galvanized and X-Tube steel pipes. Reflects expenditures and miles of pipe installed since the Company acquired Florida City Gas in 2004.
(g)Installation of large diameter pressure improvement and system reinforcement projects.
(h)Installation of new business construction and strategic line extension.
(i)Recovery of the related program costs was incorporated in Atlanta Gas Light's petition for GRAM, which the Georgia PSC approved on February 21, 2017. See "Base Rate Cases" herein and Note 3 to the financial statements under "Regulatory Matters – Base Rate Cases" for additional information.
Nicor Gas
In 2013, Illinois enacted legislation that allows Nicor Gas to provide more widespread safety and reliability enhancements to its distribution system. The legislation stipulates that rate increases to customers as a result of any infrastructure investments shall not exceed a cumulative annual average of 4.0% or, in any given year, 5.5% of base rate revenues. In 2014, the Illinois
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Commission approved the nine-year regulatory infrastructure program, Investing in Illinois, under which Nicor Gas implemented rates that became effective in March 2015. Nicor Gas expects to place into service $350 million of qualifying projects under Investing in Illinois in 2018.
Investing in Illinois is subject to annual review by the Illinois Commission. In conjunction with the base rate case order issued by the Illinois Commission on January 31, 2018, Nicor Gas is recovering the portion of these program costs incurred prior to December 31, 2017 through base rates. See "Base Rate Cases" herein for additional information.
Atlanta Gas Light
Atlanta Gas Light's STRIDE program, which was initially approved by the Georgia PSC in 2009, is comprised of i-SRP, i-CGP, and i-VPR, and consists of infrastructure development, enhancement, and replacement programs that are used to update and expand distribution systems and LNG facilities, improve system reliability, and meet operational flexibility and growth. For 2017 and subsequent years, the recovery of and return on current and future capital investments under the STRIDE program are included in the annual base rate revenue adjustment under GRAM.
The i-CGP program authorized Atlanta Gas Light to spend $91 million through 2017 on projects to extend its pipeline facilities to serve customers in areas without pipeline access and create new economic development opportunities in Georgia. This program ended in 2017 and was replaced with a tariff to provide up to $15 million annually for Atlanta Gas Light to commit to strategic economic development projects.
The i-SRP program authorized $445 million of capital spending through 2017 for projects to upgrade Atlanta Gas Light's distribution system and LNG facilities in Georgia, improve its peak-day system reliability and operational flexibility, and create a platform to meet long-term forecasted growth. In August 2016, Atlanta Gas Light filed a petition with the Georgia PSC for approval of a four-year extension of its i-SRP seeking approval to invest an additional $177 million to improve and upgrade its core gas distribution system in years 2017 through 2020.
The i-VPR program authorized Atlanta Gas Light to spend $275 million through 2017 to replace 756 miles of aging plastic pipe that was installed primarily in the mid-1960s to the early 1980s. Atlanta Gas Light has identified approximately 3,300 miles of vintage plastic mains in its system that should be considered for potential replacement.
See "Base Rate Cases" herein for additional information on GRAM.
Elizabethtown Gas
Elizabethtown Gas' 2013 extension of the AIR enhanced infrastructure program allowed for infrastructure investment of $115 million over four years and was focused on the replacement of aging cast iron in its pipeline system. Carrying charges on the additional capital spend are being accrued and deferred for regulatory purposes at a weighted average cost of capital of 6.65%. Effective July 1, 2017, investments under this program, which ended September 30, 2017, are being recovered through base rate revenues. See "Base Rate Cases" herein for additional information.
In 2015, Elizabethtown Gas filed the Safety, Modernization and Reliability Tariff plan with the New Jersey BPU seeking approval to invest more than $1.1 billion to replace 630 miles of vintage cast iron, steel, and copper pipeline, as well as 240 regulator stations. During the first quarter 2018, Elizabethtown Gas withdrew this filing in response to a proposed rule by the New Jersey BPU to incentivize utilities to accelerate investment in infrastructure replacement programs that enhance reliability, resiliency, and/or safety of the distribution system. Elizabethtown Gas expects to file a revised plan during the second half of 2018. The ultimate outcome of this matter cannot be determined at this time.
Virginia Natural Gas
In 2012, the Virginia Commission approved the SAVE program, an accelerated infrastructure replacement program, to be completed over a five-year period. This program included a maximum allowance for capital expenditures of $25 million per year, not to exceed $105 million in total.
In March 2016, the Virginia Commission approved an extension to the SAVE program for Virginia Natural Gas to replace more than 200 miles of aging pipeline infrastructure and invest up to $30 million in 2016 and up to $35 million annually through 2021. Virginia Natural Gas expects to invest $35 million under this program in 2018.
The SAVE program is subject to annual review by the Virginia Commission. In conjunction with the base rate case order issued by the Virginia Commission on December 21, 2017, Virginia Natural Gas is recovering the portion of these program costs incurred prior to September 1, 2017 through base rates. See "Base Rate Cases" herein for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Florida City Gas
In 2015, the Florida PSC approved Florida City Gas' SAFE, under which costs incurred for replacing aging pipes are recovered through a rate rider with annual adjustments and true-ups. Under the program, Florida City Gas is authorized to spend $105 million over a 10-year period on infrastructure relocation and enhancement projects. Florida City Gas expects to invest $10 million under this program in 2018.
PRP Settlement
In 2015, Atlanta Gas Light received a final order from the Georgia PSC for a rate true-up of allowed unrecovered revenue through 2014 related to its PRP. This order allows Atlanta Gas Light to recover $144 million of the $178 million previously unrecovered program revenue. The remaining $34 million requested related primarily to previously unrecognized ratemaking amounts and did not have a material impact on the Company's financial statements. The Company also recognized $1 million of interest expense and $5 million in operations and maintenance expense related to the PRP on the Company's statements of income for the predecessor year ended December 31, 2015. See "Unrecognized Ratemaking Amounts" herein for additional information.
As a result of the PRP settlement, Atlanta Gas Light began recovering incremental PRP surcharge amounts through three phased in increases in addition to its already existing PRP surcharge amount, which was established to address recovery of the unrecovered PRP balance of $144 million in 2015 and the estimated amounts to be earned under the program through 2025. The initial incremental surcharge of approximately $15 million annually was effective in October 2015, with additional annual increases of approximately $15 million in each of October 2016 and 2017. The final increase scheduled for October 2017 was included in the implementation of GRAM in March 2017. The under recovered balance is the result of the continued revenue requirement earned under the program offset by the existing and incremental PRP surcharges. The unrecovered balance at December 31, 2017 was $187 million, including $104 million of unrecognized equity return. The PRP surcharge will remain in effect until the earlier of the full recovery of the under recovered amount or December 31, 2025. See "Base Rate Cases" herein for additional information on GRAM.
One of the capital projects under the PRP experienced construction issues and Atlanta Gas Light was required to complete mitigation work prior to placing it in service. These mitigation costs will be included in future base rates in 2018. Provisions in the order resulted in the recognition of $5 million in operations and maintenance expense for the predecessor year ended December 31, 2015 on the Company's statements of income. In 2017, Atlanta Gas Light recovered $20 million from the settlement of contractor litigation claims and continues to pursue contractual and legal claims against a third-party contractor. Mitigation costs recovered through the legal process are retained by Atlanta Gas Light. The ultimate outcome of this matter cannot be determined at this time.
Base Rate Cases
Settled Base Rate Cases
On February 21, 2017, the Georgia PSC approved GRAM and a $20 million increase in annual base rate revenues for Atlanta Gas Light, effective March 1, 2017. GRAM adjusts base rates annually, up or down, using an earnings band based on the previously approved ROE of 10.75% and does not collect revenue through special riders and surcharges. Atlanta Gas Light adjusts rates up to the lower end of the band of 10.55% and adjusts rates down to the higher end of the band of 10.95%. Various infrastructure programs previously authorized by the Georgia PSC under Atlanta Gas Light's STRIDE program, which include i-VPR and i-SRP, will continue under GRAM and the recovery of and return on the infrastructure program investments will be included in annual base rate adjustments. The Georgia PSC will review Atlanta Gas Light's performance annually under GRAM.
Pursuant to the GRAM approval, Atlanta Gas Light and the staff of the Georgia PSC agreed to a variation to the i-CGP that was formerly part of Atlanta Gas Light's STRIDE program. As a result, a new tariff was created, effective October 10, 2017, to provide up to $15 million annually for Atlanta Gas Light to commit to strategic economic development projects. Projects under this tariff must be approved by the Georgia PSC.
Beginning with the next rate adjustment in June 2018, Atlanta Gas Light's recovery of the previously unrecovered Pipeline Replacement Program revenue through 2014, as well as the mitigation costs associated with the Pipeline Replacement Program that were not previously included in its rates, will also be included in GRAM. In connection with the GRAM approval, the last monthly Pipeline Replacement Program surcharge increase became effective March 1, 2017.
On June 30, 2017, the New Jersey BPU approved a settlement that provides for a $13 million increase in annual base rate revenues, effective July 1, 2017, based on a ROE of 9.6%. Also included in the settlement was a new composite depreciation rate that is expected to result in a $3 million annual reduction of depreciation. See Note 11 to the financial statements under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for information on the proposed sale of Elizabethtown Gas.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


On December 21, 2017, the Virginia Commission approved a settlement for a $34 million increase in annual base rate revenues, effective September 1, 2017, including $13 million related to the recovery of investments under the SAVE program. See "Infrastructure Replacement Programs and Capital Projects" herein for additional information. An authorized ROE range of 9.0% to 10.0% with a midpoint of 9.5% will be used to determine the revenue requirement in any filing, other than for a change in base rates.
On January 31, 2018, the Illinois Commission approved a $137 million increase in annual base rate revenues, including $93 million related to the recovery of investments under the Investing in Illinois program, effective February 8, 2018, based on a ROE of 9.8%.
Pending Base Rate Cases
On October 23, 2017, Florida City Gas filed a general base rate case with the Florida PSC requesting a $19 million increase in annual base rate revenues. On January 29, 2018, Florida City Gas filed an update to incorporate the effects of the Tax Reform Legislation that, if approved, would reduce the requested base rate revenues by $4 million. The requested increase is based on a 2018 projected test year and a ROE of 11.25%. The requested increase includes $3 million related to the recovery of investments under SAFE that are currently being recovered through a surcharge. Additionally, Florida City Gas requested an interim rate increase of $5 million annually that was approved and became effective January 12, 2018, subject to refund. The Florida PSC is expected to rule on the requested increase in mid-2018.
On December 1, 2017, Atlanta Gas Light filed its 2018 annual rate adjustment with the Georgia PSC. If approved, annual base rate revenues will increase by $22 million, effective June 1, 2018. Atlanta Gas Light will file a revised rate adjustment to incorporate the effects of the Tax Reform Legislation in the first quarter 2018. The Georgia PSC is expected to rule on the revised requested increase in the second quarter 2018.
On February 15, 2018, Chattanooga Gas filed a general base rate case with the Tennessee Public Utility Commission requesting a $7 million increase in annual base rate revenues. The requested increase, which incorporated the effects of the Tax Reform Legislation, was based on a projected test year ending June 30, 2019 and a ROE of 11.25%. The Tennessee Public Utility Commission is expected to rule on the requested increase in the third quarter 2018.
The ultimate outcome of these pending base rate cases cannot be determined at this time.
Other
The New Jersey BPU, Virginia Commission, Tennessee Public Utility Commission, and Maryland PSC each issued an order effective January 1, 2018 that requires utilities in their respective states to track as a regulatory liability the impact of the Tax Reform Legislation, including the reduction in the corporate income tax rate to 21% and the impact of excess deferred income taxes. The New Jersey BPU's order requires Elizabethtown Gas to file by March 2, 2018 proposed revised base rates with an April 1, 2018 interim effective date and a July 1, 2018 final effective date. Virginia Natural Gas will address the Virginia Commission's order in its Annual Information Filing, which will be filed by July 1, 2018. The Tennessee Public Utility Commission's order required Chattanooga Gas to file proposals to reduce rates or make other ratemaking adjustments to account for the impact of the Tax Reform Legislation. Chattanooga Gas made the required filing as part of its February 15, 2018 general base rate case filing. The Maryland PSC's order required Elkton Gas to file an explanation of the impact of the Tax Reform Legislation on its expenses and revenues, as well as when and how it expects to pass through to its customers those effects. Elkton Gas made the required filing on February 15, 2018 and will reduce annual base rates by $0.1 million effective April 1, 2018. Credits will be issued to customers for the impact of the Tax Reform Legislation from January 2018 through March 2018.
The Illinois Commission issued an order effective January 25, 2018 that requires utilities in the state to record the impacts of the Tax Reform Legislation, including the reduction in the corporate income tax rate to 21% and the impact of excess deferred income taxes, as a regulatory liability. On February 20, 2018, the Illinois Commission granted Nicor Gas' application for rehearing to file revised base rates and tariffs, which Nicor Gas expects to file by the end of the second quarter 2018.
The ultimate outcome of these matters cannot be determined at this time.
Asset Management Agreements
All of the natural gas distribution utilities except Nicor Gas use asset management agreements with the Company's wholly-owned subsidiary, Sequent, for the primary purpose of reducing utility customers' gas cost recovery rates through payments to the utilities by Sequent. For Atlanta Gas Light, these payments are controlled by the Georgia PSC and are utilized for infrastructure improvements and to fund heating assistance programs, rather than as a reduction to gas cost recovery rates. Under these asset management agreements, Sequent supplies natural gas to the utility and markets available pipeline and storage capacity to improve the overall cost of supplying gas to the utility customers. Currently, the Company's utilities primarily purchase their gas
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


from Sequent. The purchase agreements require Sequent to provide firm gas to the natural gas distribution utilities, but these natural gas distribution utilities maintain the right and ability to make their own long-term supply arrangements if they believe it is in the best interest of their customers.
Each agreement provides for Sequent to make payments to the natural gas distribution utilities through either an annual minimum guarantee within a profit sharing structure, a profit sharing structure without an annual minimum guarantee, or a fixed fee. From the inception of these agreements in 2001 through December 31, 2017, Sequent made sharing payments to the natural gas distribution utilities under these agreements totaling $390 million.
The following table provides payments made by Sequent to the natural gas distribution utilities under these agreements during the last three years:
  Successor  Predecessor  
  Total Amount Received  Total Amount Received 
  Year Ended December 31, July 1, 2016 through December 31,  January 1, 2016 through June 30, Year Ended December 31, 
  2017 2016  2016 2015 Expiration Date
  (in millions)  (in millions) 
Elizabethtown Gas $11
 $3
  $12
 $28
 March 2019
Virginia Natural Gas 6
 2
  9
 15
 March 2019
Atlanta Gas Light 4
 1
  6
 15
 March 2020
Florida City Gas 1
 
  1
 1
 
(a) 
Chattanooga Gas 1
 
  1
 1
 March 2021
Total(b)
 $23
 $6
  $29
 $60
  
(a)The agreement renews automatically each year unless terminated by either party.
(b)Payments made to Elkton Gas were less than $1 million for each of the periods presented.
Upon consummation of the asset sales of Elizabethtown Gas and Elkton Gas, South Jersey Industries, Inc. will assume the asset management agreements of Elizabethtown Gas and Elkton Gas. See Note 11 to the financial statements under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for additional information on these sales.
energySMART
In 2014, the Illinois Commission approved Nicor Gas' energySMART through 2017, which outlined energy efficiency program offerings and therm reduction goals, and subsequently extended the program to 2021. Through December 31, 2017, Nicor Gas spent $107 million of the initial authorized expenditure of $113 million. A new four-year program began on January 1, 2018, with an additional authorized expenditure of $160 million. Nicor Gas expects to invest $40 million under this program in 2018.
Unrecognized Ratemaking Amounts
The following table illustrates the Company's authorized ratemaking amounts that are not recognized on its balance sheets. These amounts are primarily composed of an allowed equity rate of return on assets associated with certain of the Company's regulatory infrastructure programs. These amounts will be recognized as revenues in the Company's financial statements in the periods they are billable to customers, the majority of which will be recovered by 2025.
 December 31, 2017 December 31, 2016
 (in millions)
Atlanta Gas Light$104
 $110
Virginia Natural Gas11
 11
Elizabethtown Gas(*)
8
 6
Nicor Gas2
 2
Total$125
 $129
(*)See Note 11 to the financial statements under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for information on the pending asset sale.
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Income Tax Matters
Federal Tax Reform Legislation
On December 22, 2017, the Tax Reform Legislation was signed into law and became effective on January 1, 2018. The Tax Reform Legislation, among other things, reduces the federal corporate income tax rate to 21%, retains normalization provisions for public utility property and existing renewable energy incentives, and repeals the corporate alternative minimum tax.
For businesses other than regulated utilities, the Tax Reform Legislation allows 100% bonus depreciation of qualified property acquired and placed in service between September 28, 2017 and January 1, 2023 and phases down by 20% each year until completely phased out for qualified property placed in service after December 31, 2027. Further, the business interest deduction is limited to 30% of taxable income excluding interest, net operating loss (NOL) carryforwards, and depreciation and amortization through December 31, 2021 and thereafter to 30% of taxable income excluding interest and NOL carryforwards.
Regulated utility businesses, including the natural gas distribution companies, can continue deducting all business interest expense and are not eligible for bonus depreciation on capital assets acquired and placed in service after September 27, 2017. Projects with binding contracts before September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the Protecting Americans from Tax Hikes (PATH) Act.
In addition, under the the Tax Reform Legislation, NOLs generated after December 31, 2017 can no longer be carried back to previous tax years but can be carried forward indefinitely, with utilization limited to 80% of taxable income of the subsequent tax year.
For the year ended December 31, 2017, implementation of the Tax Reform Legislation resulted in an estimated net tax expense of $93 million and a $777 million increase in regulatory liabilities, primarily due to the impact of the reduction of the corporate income tax rate on deferred tax assets and liabilities.
The Tax Reform Legislation is subject to further interpretation and guidance from the IRS, as well as each respective state's adoption. In addition, the regulatory treatment of certain impacts of Tax Reform Legislation is subject to the discretion of the FERC and the relevant state regulatory bodies as further described in Note 3 to the financial statements under "Base Rate Cases" and "Other" for additional information.
See FINANCIAL CONDITION AND LIQUIDITY – "Credit Rating Risk" herein and Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
The ultimate outcome of these matters cannot be determined at this time.
Bonus Depreciation
Under the Tax Reform Legislation, projects with binding contracts prior to September 28, 2017 and placed in service after September 27, 2017 remain eligible for bonus depreciation under the PATH Act. The PATH Act allowed for 50% bonus depreciation for 2015 through 2017, 40% bonus depreciation for 2018, and 30% bonus depreciation for 2019 and certain long-lived assets placed in service in 2020. Based on provisional estimates, bonus depreciation is expected to result in positive cash flows of approximately $200 million for the 2017 tax year and approximately $60 million for the 2018 tax year. Should Southern Company have a NOL in 2018, all of these cash flows may not be fully realized in 2018. See Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information. The ultimate outcome of this matter cannot be determined at this time.
State Tax Reform Legislation
On July 6, 2017, the State of Illinois enacted tax legislation that repealed its non-combination tax rule and increased the effective corporate income tax rate from 5.25% to 7.0% (making the total corporate tax rate 9.5% when combined with the 2.5% personal property replacement tax) effective July 1, 2017. In addition to increasing taxes on future earnings, this legislation required the Company to increase accumulated deferred income tax liabilities by $24 million during the third quarter 2017 to reflect these changes, of which $15 million was expensed and $9 million was recorded as a regulatory asset.
Change in State Apportionment Factors
Southern Company calculated new apportionment factors in several states to include the Company in its consolidated tax filings, which resulted in $22 million of additional deferred income tax expenses in the successor year ended December 31, 2017.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Other Matters
The Company is involved in various other matters being litigated and regulatory matters that could affect future earnings. In addition, the Company is subject to certain claims and legal actions arising in the ordinary course of business.
Nicor Gas and Nicor Energy Services Company, wholly-owned subsidiaries of the Company, and Nicor Inc. were defendants in a putative class action initially filed in 2011 in the state court in Cook County, Illinois. The plaintiffs purported to represent a class of the customers who purchased the Gas Line Comfort Guard product from Nicor Energy Services Company and variously alleged that the marketing, sale, and billing of the Gas Line Comfort Guard product violated the Illinois Consumer Fraud and Deceptive Business Practices Act, constituting common law fraud and resulting in unjust enrichment of these entities. The plaintiffs sought, on behalf of the classes they purported to represent, actual and punitive damages, interest, costs, attorney fees, and injunctive relief. On February 8, 2017, the judge denied the plaintiffs' motion for class certification and the Company's motion for summary judgment. On March 7, 2017, the parties reached a settlement, which was finalized and effective on April 3, 2017. The settlement did not have a material impact on the Company's financial statements.
The Company is assessing its alleged involvement in an incident that occurred in one of its service territories that resulted in several deaths, injuries, and property damage. One of the natural gas distribution utilities has been named as one of the defendants in several lawsuits related to this incident. The Company has insurance that provides full coverage of any financial exposure in excess of $11 million per incident. During the successor period ended December 31, 2016 and the predecessor period ended December 31, 2015, the Company recorded reserves for substantially all of its potential exposure from these cases.
The ultimate outcome of these matters and such pending or potential litigation or regulatory matters cannot be predicted at this time; however, for current proceedings not specifically reported herein or in Note 3 to the financial statements, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements. See Note 3 to the financial statements under "General Litigation Matters" for a discussion of various other contingencies, regulatory matters, and other matters being litigated which may affect future earnings potential.
The Company owns a 50% interest in a planned LNG liquefaction and storage facility in Jacksonville, Florida. Once construction is complete and the facility is operational, it will be outfitted with a 2.0 million gallon storage tank with the capacity to produce in excess of 120,000 gallons of LNG per day. It is expected to be operational in the first half of 2018. The ultimate outcome of this matter cannot be determined at this time.
A wholly-owned subsidiary of the Company owns and operates a natural gas storage facility consisting of two salt dome caverns in Louisiana. Periodic integrity tests are required in accordance with rules of the Louisiana Department of Natural Resources (DNR). In August 2017, in connection with an ongoing integrity project, updated seismic mapping indicated the proximity of one of the caverns to the edge of the salt dome may be less than the required minimum and could result in the Company retiring the cavern early. At December 31, 2017, the facility's property, plant, and equipment had a net book value of $112 million, of which the cavern itself represents approximately 20%. A potential early retirement of this cavern is dependent upon several factors including compliance with an order from the Louisiana DNR detailing the requirements to place the cavern back in service, which includes, among other things, obtaining core samples to determine the composition of the sheath surrounding the edge of the salt dome.
The cavern continues to maintain its pressures and overall structural integrity. The Company intends to monitor the cavern and comply with the Louisiana DNR order through 2020 and place the cavern back in service in 2021. These events were considered in connection with the Company's annual long-lived asset impairment analysis, which determined there was no impairment as of December 31, 2017. Any changes in results of monitoring activities, rates at which expiring capacity contracts are re-contracted, timing of placing the cavern back in service, or Louisiana DNR requirements could trigger impairment. Further, early retirement of the cavern could trigger impairment of other long-lived assets associated with the natural gas storage facility. The ultimate outcome of this matter cannot be determined at this time, but could have a material impact on the Company's financial statements.
Effective January 1, 2018, the Company conformed its paid time off policy to align with Southern Company. Under the new policy, paid time off days are vested by the employee on the first day of each year and will continue to be recovered through rates on an as-paid basis. As a result, the Company accrued $21 million as of January 1, 2018, of which $9 million was recorded as a regulatory asset.
ACCOUNTING POLICIES
Application of Critical Accounting Policies and Estimates
The Company prepares its financial statements in accordance with GAAP. Significant accounting policies are described in Note 1 to the financial statements. In the application of these policies, certain estimates are made that may have a material impact on the
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Company's results of operations and related disclosures. Different assumptions and measurements could produce estimates that are significantly different from those recorded in the financial statements. Senior management has reviewed and discussed the following critical accounting policies and estimates with the Audit Committee of Southern Company's Board of Directors.
Utility Regulation
The natural gas distribution utilities comprised approximately 82% of the Company's total operating revenues for 2017 and are subject to rate regulation by their respective state regulatory agencies, which set the rates utilities are permitted to charge customers based on allowable costs, including a reasonable ROE. As a result, the natural gas distribution utilities apply accounting standards which require the financial statements to reflect the effects of rate regulation. Through the ratemaking process, the regulators may require the inclusion of costs or revenues in periods different than when they would be recognized by a non-regulated company. This treatment may result in the deferral of expenses and the recording of related regulatory assets based on anticipated future recovery through rates or the deferral of gains or creation of liabilities and the recording of related regulatory liabilities. The application of the accounting standards has a further effect on the Company's financial statements as a result of the estimates of allowable costs used in the ratemaking process. These estimates may differ from those actually incurred by the natural gas distribution utilities; therefore, the accounting estimates inherent in specific costs such as depreciation and pension and other postretirement benefits have less of a direct impact on the Company's results of operations and financial condition than they would on a non-regulated company.
As reflected in Note 1 to the financial statements, significant regulatory assets and liabilities have been recorded. Management reviews the ultimate recoverability of these regulatory assets and any requirement to refund these regulatory liabilities based on applicable regulatory guidelines and GAAP. However, adverse legislative, judicial, or regulatory actions could materially impact the amounts of such regulatory assets and liabilities and could adversely impact the Company's financial statements.
Accounting for Income Taxes
The consolidated income tax provision and deferred income tax assets and liabilities, as well as any unrecognized tax benefits and valuation allowances, require significant judgment and estimates. These estimates are supported by historical tax return data, reasonable projections of taxable income and interpretations of applicable tax laws and regulations across multiple taxing jurisdictions. The effective tax rate reflects the statutory tax rates and calculated apportionments for the many states in which the Company operates.
On behalf of the Company, Southern Company files a consolidated federal income tax return and various state income tax returns, some of which are combined or unitary. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. Certain deductions and credits can be limited at the consolidated or combined level resulting in NOL and tax credit carryforwards that would not otherwise result on a stand-alone basis. Utilization of NOL carryforwards and the assessment of valuation allowances are based on significant judgment and extensive analysis of the Company's, as well as Southern Company's, current financial position and result of operations, including currently available information about future years, to estimate when future taxable income will be realized.
Current and deferred state income tax liabilities and assets are estimated based on laws of multiple states that determine the income to be apportioned to their jurisdictions. States utilize various formulas to calculate the apportionment of taxable income, primarily using sales, assets or payroll within the jurisdiction compared to the consolidated totals. In addition, each state varies as to whether a stand-alone, combined or unitary filing methodology is required. The calculation of deferred state taxes considers apportionment factors and filing methodologies that are expected to apply in future years. The apportionments and methodologies which are ultimately finalized in a manner inconsistent with expectations could have a material effect on the Company's financial statements.
Given the significant judgment involved in estimating NOL carryforwards and tax credit carryforwards and multi-state apportionments, the Company considers state deferred income tax liabilities and assets to be critical accounting estimates.
Federal Tax Reform Legislation
Following the enactment of the Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its
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accounting. The ultimate impact of the Tax Reform Legislation on deferred income tax assets and liabilities and the related regulatory liabilities cannot be determined at this time. See "Income Tax MattersFederal Tax Reform Legislation" herein and Note 3 to the financial statements under "Base Rate Cases" and "Other" and Note 5 to the financial statements under "Current and Deferred Income Taxes" for additional information.
Assessment of Assets
Goodwill
The Company does not amortize its goodwill, but tests it annually for impairment at the reporting unit level during the fourth quarter or more frequently if impairment indicators arise. These indicators include, but are not limited to, a significant change in operating performance, the business climate, legal or regulatory factors, or a planned sale or disposition of a significant portion of the business. A reporting unit is the operating segment, or a business one level below the operating segment (a component), if discrete financial information is prepared and regularly reviewed by management. Components are aggregated if they have similar economic characteristics.
As part of the Company's impairment test, the Company may perform an initial qualitative Step 0 assessment to determine whether it is more likely than not that the fair value of each reporting unit is less than its carrying amount before applying the two-step, quantitative goodwill impairment test. If the Company elects to perform the qualitative assessment, it evaluates relevant events and circumstances, including but not limited to, macroeconomic conditions, industry and market conditions, cost factors, financial performance, entity specific events, and events specific to each reporting unit. If the Company determines that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, or it elects not to perform a qualitative assessment, it performs the two-step goodwill impairment test.
Step 1 of the two-step goodwill impairment test compares the fair value of the reporting unit to its carrying value. If the result of the Step 1 test reveals that the estimated fair value is below its carrying value, the Company proceeds with Step 2.
Step 2 of the two-step goodwill impairment test compares the implied fair value of goodwill, which is calculated as the residual amount from the reporting unit's overall fair value after assigning fair values to its assets and liabilities under a hypothetical purchase price allocation as if the reporting unit had been acquired in a business combination, to its carrying value. Based on the result of the Step 2 test, the Company records a goodwill impairment charge for any excess of carrying value over the implied fair value of goodwill.
For the 2017 annual impairment test, the Company performed Step 1 of the two-step impairment test, which resulted in the fair value of all of its reporting units that have goodwill exceeding their carrying value. For the 2016 and 2015 annual impairment tests, the Company performed the qualitative Step 0 assessment and determined that it was more likely than not that the fair value of all of its reporting units with goodwill exceeded their carrying amounts, and therefore no quantitative analysis was required. In the third quarter 2015, the Company identified potential impairment indicators and performed an interim impairment test for its storage and fuels reporting unit, which resulted in impairment of the full $14 million goodwill balance for that reporting unit.
As the determination of an asset's fair value and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the Company considers these estimates to be critical accounting estimates.
See "Recently Issued Accounting Standards – Other" herein for information on the Company's adoption of ASU No. 2017-04 effective January 1, 2018.
Long-Lived Assets
The Company depreciates or amortizes its long-lived and intangible assets over their estimated useful lives. The Company assesses its long-lived and intangible assets for impairment whenever events or changes in circumstances indicate that an asset's carrying amount may not be recoverable. When such events or circumstances are present, the Company assesses the recoverability of long-lived assets by determining whether the carrying value will be recovered through the expected future cash flows. Impairment is indicated if the carrying amount of a long-lived asset exceeds the sum of the undiscounted future cash flows expected to result from the use and eventual disposition of the asset. If impairment is indicated, the Company records an impairment loss equal to the difference between the carrying value and the fair value of the long-lived asset.
As the determination of the expected future cash flows generated from an asset, an asset's fair value, and useful life involves management making certain estimates and because these estimates form the basis for the determination of whether or not an impairment charge should be recorded, the Company considers these estimates to be critical accounting estimates.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Derivatives and Hedging Activities
Determining whether a contract meets the definition of a derivative instrument, contains an embedded derivative requiring bifurcation, or qualifies for hedge accounting treatment is voluminous and complex. The treatment of a single contract may vary from period to period depending upon accounting elections, changes in the Company's assessment of the likelihood of future hedged transactions, or new interpretations of accounting guidance. As a result, judgment is required in determining the appropriate accounting treatment. In addition, the estimated fair value of derivative instruments may change significantly from period to period depending upon market conditions, and changes in hedge effectiveness may impact the accounting treatment.
Derivative instruments (including certain derivative instruments embedded in other contracts) are recorded on the balance sheets as either assets or liabilities measured at their fair value. If the transaction qualifies for, and is designated as, a normal purchase or normal sale, it is exempted from fair value accounting treatment and is, instead, subject to traditional accrual accounting. The Company utilizesunobservable market data or assumptions that a market participantsparticipant would use in pricing the derivative asset or liability, including assumptions about riskliability. The use of observable inputs is maximized where available and the risks inherent in theuse of unobservable inputs of the valuation technique.
Changes in the derivatives'is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement.
Level 1 consists of observable market data in an active market for identical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.
Level 3 consists of unobservable market data. The input may reflect the assumptions of each Registrant of what a market participant would use in pricing an asset or liability. If there is little available market data, then each Registrant's own assumptions are recognized concurrently in earnings unless specific hedge accounting criteria are met. If the derivatives meet those criteria, derivative gains and losses offset related results of the hedged item in the income statement inbest available information.
In the case of multiple inputs being used in a fair value hedge, or gains and losses are recorded in OCI on the balance sheets until the hedged transaction affects earnings in the case of a cash flow hedge. Additionally, a company is required to formally designate a derivative as a hedge as well as document and assess the effectiveness of derivatives associated with transactions that receive hedge accounting treatment.
Nicor Gas and Elizabethtown Gas utilize derivative instruments to hedge the price risk for the purchase of natural gas for customers. These derivatives are reflected at fair value and are not designated as accounting hedges. Realized gains or losses on such instruments are included in the cost of gas delivered and are passed through directly to customers, subject to review by the applicable state regulatory agencies, and therefore have no direct impact on earnings. Unrealized changes in the fair value of these derivative instruments are deferred as regulatory assets or liabilities.
The Company uses derivative instruments primarily to reduce the impact to its results of operations due to the risk of changes in the price of natural gas and to a lesser extent the Company hedges against warmer-than-normal weather and interest rates. The fair value of natural gas derivative instruments used to manage exposure to changing natural gas prices reflects the estimated amounts that the Company would receive or pay to terminate or close the contracts at the reporting date, taking into account the current unrealized gains or losses on open contracts. For derivatives utilized at gas marketing services and wholesale gas services that are not designated as accounting hedges, changes in fair value are reported as gains or losses in the Company's results of operations in the period of change. Gas marketing services records derivative gains or losses arising from cash flow hedges in OCI and reclassifies them into earnings in the same period that the underlying hedged item is recognized in earnings.
The Company classifies derivative assets and liabilities based onmeasurement, the lowest level of input that is significant to the fair value measurement. The assessment ofmeasurement represents the significance of a particular input tolevel in the fair value hierarchy in which the fair value measurement requires judgmentis reported.
Net asset value as a practical expedient is the classification used for assets that do not have readily determined fair values. Fund managers value the assets using various inputs and may affecttechniques depending on the valuationnature of fair valuethe underlying investments.

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At December 31, 2023, assets and liabilities and their placement within themeasured at fair value hierarchy. The determinationon a recurring basis during the period, together with their associated level of the fair value of the derivative instruments incorporates various required factors. These factors include:hierarchy, were as follows:
the creditworthiness of the counterparties involved and the impact of credit enhancements (such as cash deposits and letters of credit);
events specific to a given counterparty; and
the impact of the Company's nonperformance risk on its liabilities.
If there is a significant change in the underlying market prices or pricing assumptions the Company uses in pricing its derivative assets or liabilities, the Company may experience a significant impact on its financial position, results of operations, and cash flows. See Note 10 to the financial statements for additional information.
Given the assumptions used in pricing the derivative asset or liability, the Company considers the valuation of derivative assets and liabilities a critical accounting estimate. See FINANCIAL CONDITION AND LIQUIDITY – "Market Price Risk" herein for more information.
Pension and Other Postretirement Benefits
The Company's calculation of pension and other postretirement benefits expense is dependent on a number of assumptions. These assumptions include discount rates, healthcare cost trend rates, expected long-term return on plan assets, mortality rates, expected salary and wage increases, and other factors. Components of pension and other postretirement benefits expense include interest and service cost on the pension and other postretirement benefit plans, expected return on plan assets, and amortization of certain unrecognized costs and obligations. Actual results that differ from the assumptions utilized are accumulated and amortized over
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Energy-related derivatives(a)
$$49 $— $— $55 
Investments in trusts:(b)
Domestic equity764 216 — — 980 
Foreign equity145 171 — — 316 
U.S. Treasury and government agency securities— 369 — — 369 
Municipal bonds— 48 — — 48 
Pooled funds – fixed income— — — 
Corporate bonds— 389 — — 389 
Mortgage and asset backed securities— 89 — — 89 
Private equity— — — 169 169 
Cash and cash equivalents— — — 
Other58 — 70 
Cash equivalents and restricted cash253 15 — — 268 
Other investments27 — 44 
Total$1,238 $1,382 $$178 $2,806 
Liabilities:
Energy-related derivatives(a)
$46 $312 $— $— $358 
Interest rate derivatives— 264 — — 264 
Foreign currency derivatives— 122 — — 122 
Contingent consideration— 16 — 19 
Other— 13 — — 13 
Total$49 $711 $16 $— $776 
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Southern Company Gas and Subsidiary Companies 2017 Annual Report



Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Alabama Power
Assets:
Energy-related derivatives$— $15 $— $— $15 
Nuclear decommissioning trusts:(b)
Domestic equity443 208 — — 651 
Foreign equity145 — — — 145 
U.S. Treasury and government agency securities— 20 — — 20 
Municipal bonds— — — 
Corporate bonds— 231 — — 231 
Mortgage and asset backed securities— 25 — — 25 
Private equity— — — 169 169 
Other— — 17 
Cash equivalents and restricted cash119 15 — — 134 
Other investments— 27 — — 27 
Total$715 $542 $— $178 $1,435 
Liabilities:
Energy-related derivatives$— $110 $— $— $110 
Georgia Power
Assets:
Energy-related derivatives$— $13 $— $— $13 
Nuclear decommissioning trusts:(b)
Domestic equity321 — — 322 
Foreign equity— 170 — — 170 
U.S. Treasury and government agency securities— 349 — — 349 
Municipal bonds— 47 — — 47 
Corporate bonds— 158 — — 158 
Mortgage and asset backed securities— 64 — — 64 
Other50 — — 53 
Total$371 $805 $— $— $1,176 
Liabilities:
Energy-related derivatives$— $124 $— $— $124 
future periods
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Mississippi Power
Assets:
Energy-related derivatives$— $15 $— $— $15 
Cash equivalents17 — — — 17 
Total$17 $15 $— $— $32 
Liabilities:
Energy-related derivatives$— $61 $— $— $61 
Southern Power
Assets:
Energy-related derivatives$— $$— $— $
Liabilities:
Energy-related derivatives$— $$— $— $
Foreign currency derivatives— 22 — — 22 
Contingent consideration— 16 — 19 
Other— 13 — — 13 
Total$$40 $16 $— $59 
Southern Company Gas
Assets:
Energy-related derivatives(a)
$$$— $— $
Non-qualified deferred compensation trusts:
Domestic equity— — — 
Foreign equity— — — 
Pooled funds - fixed income— — — 
Cash and cash equivalents— — — 
Total$$17 $— $— $26 
Liabilities:
Energy-related derivatives(a)(b)
$46 $12 $— $— $58 
Interest rate derivatives— 79 — — 79 
Total$46 $91 $— $— $137 
(a)Excludes cash collateral of $62 million.
(b)Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and therefore, generally affect recognized expensecurrencies. See Note 6 under "Nuclear Decommissioning" for additional information.
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At December 31, 2022, assets and liabilities measured at fair value on a recurring basis during the recorded obligation in future periods. Whileperiod, together with their associated level of the Company believes thatfair value hierarchy, were as follows:
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Energy-related derivatives(a)
$18 $181 $— $— $199 
Interest rate derivatives— 12 — — 12 
Investments in trusts:(b)(c)
Domestic equity651 178 — — 829 
Foreign equity125 150 — — 275 
U.S. Treasury and government agency securities— 285 — — 285 
Municipal bonds— 51 — — 51 
Pooled funds – fixed income— — — 
Corporate bonds— 412 — — 412 
Mortgage and asset backed securities— 90 — — 90 
Private equity— — — 161 161 
Cash and cash equivalents— — — 
Other37 12 — — 49 
Cash equivalents1,427 20 — — 1,447 
Other investments26 — — 35 
Total$2,271 $1,424 $— $161 $3,856 
Liabilities:
Energy-related derivatives(a)
$32 $178 $— $— $210 
Interest rate derivatives— 302 — — 302 
Foreign currency derivatives— 216 — — 216 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$32 $709 $12 $— $753 
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Alabama Power
Assets:
Energy-related derivatives$— $62 $— $— $62 
Nuclear decommissioning trusts:(b)
Domestic equity396 169 — — 565 
Foreign equity125 — — — 125 
U.S. Treasury and government agency securities— 19 — — 19 
Municipal bonds— — — 
Corporate bonds— 225 — — 225 
Mortgage and asset backed securities— 22 — — 22 
Private equity— — — 161 161 
Other— — — 
Cash equivalents438 20 — — 458 
Other investments— 26 — — 26 
Total$966 $544 $— $161 $1,671 
Liabilities:
Energy-related derivatives$— $39 $— $— $39 
Georgia Power
Assets:
Energy-related derivatives$— $42 $— $— $42 
Nuclear decommissioning trusts:(b)(c)
Domestic equity255 — — 256 
Foreign equity— 149 — — 149 
U.S. Treasury and government agency securities— 266 — — 266 
Municipal bonds— 50 — — 50 
Corporate bonds— 187 — — 187 
Mortgage and asset backed securities— 68 — — 68 
Other30 12 — — 42 
Cash equivalents355 — — — 355 
Total$640 $775 $— $— $1,415 
Liabilities:
Energy-related derivatives$— $62 $— $— $62 
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Mississippi Power
Assets:
Energy-related derivatives$— $59 $— $— $59 
Cash equivalents47 — — — 47 
Total$47 $59 $— $— $106 
Liabilities:
Energy-related derivatives$— $32 $— $— $32 
Southern Power
Assets:
Energy-related derivatives$— $$— $— $
Liabilities:
Energy-related derivatives$— $12 $— $— $12 
Foreign currency derivatives— 47 — — 47 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$— $72 $12 $— $84 
Southern Company Gas
Assets:
Energy-related derivatives(a)
$18 $10 $— $— $28 
Non-qualified deferred compensation trusts:
Domestic equity— — — 
Foreign equity— — — 
Pooled funds - fixed income— — — 
Cash equivalents— — — 
Cash equivalents50 — — — 50 
Total$72 $26 $— $— $98 
Liabilities:
Energy-related derivatives(a)(b)
$32 $33 $— $— $65 
Interest rate derivatives— 86 — — 86 
Total$32 $119 $— $— $151 
(a)Excludes cash collateral of $41 million.
(b)Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information.
(c)Includes investment securities pledged to creditors and collateral received and excludes payables related to the assumptionssecurities lending program. See Note 6 under "Nuclear Decommissioning" for additional information.
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Valuation Methodologies
The energy-related derivatives primarily consist of exchange-traded and over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are appropriate, differences in actual experience or significant changes inmainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter products that are valued using observable market data and assumptions would affect its pensioncommonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and other postretirement benefits costs and obligations.
Key elements in determiningreceipts under the Company's pension and other postretirement benefit expense are the expected long-term return on plan assets and the discount rate used to measure the benefit plan obligations and the periodic benefit plan expense for future periods. The expected long-term return on pension and other postretirement benefit plan assets isswap agreement based on the Company's investment strategy, historical experience,market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and expectations for long-term ratesoccasionally, implied volatility of return that consider external actuarial advice.interest rate options. The Company determinesfair value of cross-currency swaps reflects the long-term return on plan assets by applying the long-term ratenet present value of expected returnspayments and receipts under the swap agreement based on various asset classesthe market's expectation of future foreign currency exchange rates. Additional inputs to the Company's target asset allocation. For purposesnet present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of determining its liability related to the pension and other postretirement benefit plans, the Company discounts the future related cash flows using a single-point discount rate developed from the weighted average of market-observed yields for high quality fixed income securities with maturities that correspond to expected benefit payments. Prior to 2016, the Company computed the interest cost component of its net periodic pension and other postretirement benefit plan expense using the same single-point discount rate. In 2016, the Company adopted a full yield curve approach for calculating the interest cost component whereby the discount rate for each year is applied to the liability for that specific year. As a result, the interest cost component of net periodic pension and other postretirement benefit plan expense decreased by approximately $7 million in 2016.
A 25 basis point change in any significant assumption (discount rate, salaries, or long-term return on plan assets) would result in a $2 million or less change in total annual benefit expense and a $42 million or less change in projected obligations.
similar instruments. See Note 2 to the financial statements14 for additional information regarding pensionon how these derivatives are used.
For fair value measurements of the investments within the nuclear decommissioning trusts and the non-qualified deferred compensation trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other postretirement benefits.
Contingent Obligationsmarket information, including live trading levels and pricing analysts' judgments, are also obtained when available.
The CompanyNRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. See Note 6 under "Nuclear Decommissioning" for additional information.
Southern Power has contingent payment obligations related to two of its acquisitions whereby it is subjectprimarily obligated to a numbermake generation-based payments to the seller, commencing at the commercial operation of federaleach facility and state lawscontinuing through 2026 and regulations2035, respectively. The obligations are primarily categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facility's generation in MW-hours, as well as other factorsinputs such as a fixed dollar amount per MW-hour, and conditions that subject it to environmental, litigation,a discount rate. The fair value of contingent consideration reflects the net present value of expected payments and other risks. See FUTURE EARNINGS POTENTIAL herein and Note 3 to the financial statements for more information regarding certain of these contingencies. The Company periodically evaluates its exposure to such risks and records reserves for those matters where a non-tax-related lossany periodic change arising from forecasted generation is considered probable and reasonably estimable. The adequacy of reserves can be significantly affected by external events or conditions that can be unpredictable; thus, the ultimate outcome of such matters could materially affect the Company's results of operations, cash flows, or financial condition.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected.immaterial.
Southern Power also has payment obligations through 2040 whereby it must reimburse the transmission owners for interconnection facilities and network upgrades constructed to support connection of a Southern Power generating facility to the transmission system. The new standard also requires enhanced disclosures regardingobligations are categorized as Level 2 under Fair Value Measurements as the nature, amount, timing,fair value is determined using observable inputs for the contracted amounts and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide natural gas without a defined contractual term,reimbursement period, as well as longer-term contractual agreements, including non-derivative natural gas asset managementa discount rate. The fair value of the obligations reflects the net present value of expected payments.
"Other investments" primarily includes investments traded in the open market that have maturities greater than 90 days, which are categorized as Level 2 under Fair Value Measurements and optimization arrangements.are comprised of corporate bonds, bank certificates of deposit, treasury bonds, and/or agency bonds.
The Company has completedfair value measurements of private market investments held in Alabama Power's nuclear decommissioning trusts that are calculated at net asset value per share (or its equivalent) as a practical expedient totaled $178 million and $161 million at December 31, 2023 and 2022, respectively. Unfunded commitments related to the evaluation of all revenue streamsprivate market investments totaled $87 million and determined$78 million at December 31, 2023 and 2022, respectively. Private market investments include high-quality private equity funds across several market sectors, funds that the adoption of ASC 606 willinvest in real estate assets, and a private credit fund. Private market funds do not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives and alternative revenue programs, are excludedhave redemption rights. Distributions from the scope of ASC 606 and, therefore,these funds will be accounted for and disclosed or presented separately from revenues under ASC 606 onreceived as the Company's financial statements. The Company has concluded contributionsunderlying investments in aid of constructionthe funds are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.liquidated.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)COMBINED NOTES TO FINANCIAL STATEMENTS
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to real estate and fleet vehicles where the Company is the lessee and to natural gas home appliances where the Company is the lessor. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18). ASU 2016-18 eliminates the need to reflect transfers between cash and restricted cash in operating, investing, and financing activities in the statement of cash flows. Upon adoption, the net change in cash and cash equivalents during the period will include amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, and will be applied retrospectively to each period presented. The Company adopted ASU 2016-18 effective January 1, 2018 with no material impact on its financial statements.
On January 26, 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-04). ASU 2017-04 removes the requirement to compare the implied fair value of goodwill with the carrying amount as part of Step 2 of the goodwill impairment test. Under the new standard, the goodwill impairment loss will be measured as the excess of a reporting unit's carrying amount over its fair value, not exceeding the total amount of goodwill allocated to that reporting unit, which may increase the frequency of goodwill impairment charges if a future goodwill impairment test does not pass the Step 1 evaluation. ASU 2017-04 is effective prospectively for periods beginning on or after December 15, 2019, with early adoption permitted. The Company adopted ASU 2017-04 effective January 1, 2018 with no impact on its financial statements.
On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
Table of ContentsIndex to Financial Statements

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


FINANCIAL CONDITION AND LIQUIDITY
Overview
The Company's financial condition remained stable at December 31, 2017. The Company's cash requirements primarily consist of funding ongoing operations, common stock dividends, capital expenditures, and debt maturities. Capital expenditures and other investing activities include investments to meet projected long-term demand requirements, to maintain existing natural gas distribution systems as well as to update and expand these systems, and to comply with environmental regulations. Operating cash flows provide a substantial portion of the Company's cash needs. For the three-year period from 2018 through 2020, the Company's projected common stock dividends, capital expenditures, and debt maturities are expected to exceed operating cash flows. The Company plans to finance future cash needs in excess of its operating cash flows primarily through external securities issuances, equity contributions from Southern Company, and borrowings from financial institutions and with proceeds from the pending asset sales of Elizabethtown Gas and Elkton Gas. The Company plans to use commercial paper to manage seasonal variations in operating cash flows and other working capital needs. The Company intends to continue to monitor its access to short-term and long-term capital markets as well as its bank credit arrangements to meet future capital and liquidity needs. See "Sources of Capital," "Financing Activities," and "Capital Requirements and Contractual Obligations" herein for additional information.
By regulation, Nicor Gas is restricted, to the extent of its retained earnings balance, in the amount it can dividend or loan to affiliates and is not permitted to make money pool loans to affiliates. The New Jersey BPU restricts the amount Elizabethtown Gas can dividend to its parent company to 70% of its quarterly net income. Additionally, as stipulated in the New Jersey BPU's order approving the Merger, the Company is prohibited from paying dividends to its parent company, Southern Company, if the Company's senior unsecured debt rating falls below investment grade. At December 31, 2017, the amount of subsidiary retained earnings and net income restricted to dividend totaled $719 million. These restrictions did not have any impact on the Company's ability to meet its cash obligations, nor does management expect such restrictions to materially impact the Company's ability to meet its currently anticipated cash obligations.
The Company's investments in the qualified pension plan increased in value at December 31, 2017 as compared to December 31, 2016. There were no voluntary contributions to the qualified pension plan in 2017 and no mandatory contributions to its qualified pension plan are anticipated during 2018. See Note 2 to the financial statements for additional information.
Net cash provided from operating activities totaled $883 million for 2017, primarily due to earnings and the timing of cash receipts for the sale of natural gas inventory and vendor payments. Net cash used for operating activities was $328 million for the successor period of July 1, 2016 through December 31, 2016, primarily due to a $125 million voluntary pension contribution, a $35 million payment for the settlement of an interest rate swap, and less cash due to the timing of collecting receivables and disbursing payables. Due to the seasonal nature of its business, the Company typically reports negative cash flows from operating activities in the second half of the year. Net cash provided from operating activities was $1.1 billion for the predecessor period of January 1, 2016 through June 30, 2016, primarily due to low volumes of natural gas sales and changes in natural gas inventory as a result of warmer weather and the timing of recovery of related gas costs and weather normalization adjustments from customers. Net cash provided from operating activities was $1.4 billion for the predecessor year ended December 31, 2015, primarily due to the timing of recovery of related gas costs from customers, cash provided from derivative financial instrument assets and liabilities, and a tax refund of $150 million related to the extension of bonus depreciation.
Net cash used for investing activities totaled $1.6 billion for 2017, which reflected $1.5 billion in capital expenditures primarily due to gross property additions for infrastructure replacement programs at gas distribution operations and $145 million in capital contributions to equity method investments in pipeline projects, partially offset by $80 million in returned capital from equity method investments in pipeline projects. Net cash used for investing activities was $2.1 billion for the successor period of July 1, 2016 through December 31, 2016, which reflected $1.4 billion primarily related to the Company's acquisition of the 50% interest in SNG, and $632 million in capital expenditures. Net cash used for investing activities was $559 million and $1.0 billion for the predecessor period of January 1, 2016 through June 30, 2016 and the predecessor year ended December 31, 2015, respectively, which primarily related to capital expenditures. See Note 4 to the financial statements under "Equity Method Investments – SNG" and Note 11 to the financial statements under "Investment in SNG" for additional information.
Net cash provided from financing activities totaled $741 million for 2017, primarily due to $850 million in debt issuances, $262 million in net additional commercial paper borrowings, and $103 million in capital contributions from Southern Company, partially offset by $443 million in common stock dividend payments to Southern Company and $22 million in repayment of long-term debt. Net cash provided from financing activities was $2.4 billion for the successor period of July 1, 2016 through December 31, 2016, which reflected $1.1 billion of capital contributions from Southern Company, primarily used to fund the
Table of ContentsIndex to Financial Statements

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Company's investment in SNG, $1.1 billion in net additional commercial paper borrowings, partially offset by $160 million for the purchase of the 15% noncontrolling ownership interest in SouthStar, and $900 million in proceeds from debt issuances, partially offset by $420 million in debt payments. Net cash used for financing activities was $558 million for the predecessor period of January 1, 2016 through June 30, 2016, primarily due to $896 million in net repayment of commercial paper borrowings and $125 million in repayment of long-term debt, partially offset by $600 million in debt issuances. Net cash used for financing activities was $366 million for the predecessor year ended December 31, 2015, primarily due to the net repayment of commercial paper borrowings, partially offset by the proceeds from debt issuances in excess of debt repayments. See Note 4 to the financial statements under "Variable Interest Entities" and "Equity Method Investments – SNG" and Note 11 to the financial statements under "Investment in SNG" for additional information.
Significant balance sheet changes at December 31, 2017 include an increase of $1.2 billion in total property, plant, and equipment primarily due to capital expenditures for infrastructure replacement programs, an increase of $1.0 billion in deferred credits related to income taxes primarily resulting from the impacts of the Tax Reform Legislation, a decrease of $886 million in accumulated deferred income tax liabilities primarily due to the change in the federal corporate income tax rate, partially offset by tax depreciation related to infrastructure assets placed in service as well as the impact of State of Illinois tax legislation, and an increase in long-term debt of $632 million, primarily due to $450 million of senior notes issued in May 2017 and $200 million of first mortgage bonds at Nicor Gas issued in each of August 2017 and November 2017. Other significant balance sheet changes include an increase of $261 million in notes payable primarily related to an increase in commercial paper borrowings of $510 million at Southern Company Gas Capital, partially offset by a decrease in commercial paper borrowings of $249 million at Nicor Gas. See FUTURE EARNINGS POTENTIAL – "Income Tax Matters" and FINANCIAL CONDITION AND LIQUIDITY – "Financing Activities" herein and Notes 5 and 6 to the financial statements for additional information.
Sources of Capital
The Company plans to obtain the funds to meet its future capital needs through operating cash flows, external securities issuances, borrowings from financial institutions, and equity contributions from Southern Company. In addition, the Company plans to utilize the proceeds from the pending asset sales of Elizabethtown Gas and Elkton Gas to pay the income taxes resulting from the sales, to retire existing debt, and for general corporate purposes. However, the amount, type, and timing of any future financings, if needed, depend upon prevailing market conditions, regulatory approval, and other factors. The issuance of securities by Nicor Gas is generally subject to the approval of the Illinois Commission.
The Southern Company system does not maintain a centralized cash or money pool. Therefore, except as described below, funds of the Company are not commingled with funds of any other company in the Southern Company system. The Company obtains financing separately without credit support from any affiliate in the Southern Company system. See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
The Company maintains commercial paper programs at Southern Company Gas Capital and Nicor Gas that consist of short-term, unsecured promissory notes. Nicor Gas' commercial paper program supports its working capital needs as Nicor Gas is not permitted to make money pool loans to affiliates. All of the Company's other subsidiaries benefit from Southern Company Gas Capital's commercial paper program.
At December 31, 2017,2023 and 2022, other financial instruments for which the Company's current liabilities exceeded current assets by $1.0 billion, primarily as a result of $1.5 billion in notes payable. The Company's current liabilities frequently exceed current assets because of commercial paper borrowings used to fund daily operations, scheduled maturities of long-term debt, and significant seasonal fluctuations in cash needs. The Company intends to utilize operating cash flows, external securities issuances, borrowings from financial institutions, equity contributions from Southern Company, and the proceeds from the pending asset sales of Elizabethtown Gas and Elkton Gas to fund short-term capital needs. The Company has substantial cash flow from operating activities and access to capital markets and financial institutions to meet liquidity needs.
At December 31, 2017, the Company had $73 million of cash and cash equivalents. Committed credit arrangements with banks at December 31, 2017carrying amount did not equal fair value were as follows:
Southern
  Company(*)
Alabama PowerGeorgia PowerMississippi PowerSouthern Power
Southern Company
 Gas(*)
(in billions)
At December 31, 2023:
Long-term debt, including securities due within one year:
Carrying amount$59.4 $11.2 $16.5 $1.6 $2.7 $7.8 
Fair value55.0 10.1 15.1 1.4 2.6 6.8 
At December 31, 2022:
Long-term debt, including securities due within one year:
Carrying amount$54.6 $10.6 $14.7 $1.5 $3.0 $7.4 
Fair value48.6 9.2 13.0 1.3 2.8 6.5 
Company Expires 2022 Unused
  (millions)
Southern Company Gas Capital(*)
 $1,400
 $1,390
Nicor Gas 500
 500
Total $1,900
 $1,890
(*)The Company guarantees the obligationscarrying amount of Southern Company Gas Capital.
TableGas' long-term debt includes fair value adjustments from the effective date of ContentsIndex to Financial Statements

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
the 2016 merger with Southern Company. Southern Company Gas and Subsidiary Companies 2017 Annual Report


See Note 6 to the financial statements under "Bank Credit Arrangements" for additional information.
In May 2017, Southern Company Gas Capital and Nicor Gas terminated their existing credit arrangements for $1.3 billion and $700 million, respectively, which were to mature in 2017 and 2018, and entered into a new multi-year credit arrangement (Facility) currently allocated for $1.4 billion and $500 million, respectively, with a maturity date of 2022, as reflected in the table above. Pursuant to the Facility, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted.
The Facility contains a covenant that limits the ratio of debt to capitalization (as defined in each facility) to a maximum of 70% for each of the Company and Nicor Gas and contains a cross-acceleration provision to other indebtedness (including guarantee obligations) of the applicable company. Such cross-acceleration provision to other indebtedness would trigger an event of default of the applicable company if the Company or Nicor Gas defaulted on indebtedness, the payment of which was then accelerated. At December 31, 2017, both companies were in compliance with such covenant. The Facility does not contain a material adverse change clause at the time of borrowings.
Subject to applicable market conditions, the applicable company expects to renew or replace the Facility as needed, prior to expiration. In connection therewith, the applicable company may extend the maturity dates and/or increase or decrease the lending commitments thereunder. A portion of unused credit with banks provides liquidity support to the Company.
The Company makes short-term borrowings primarily through commercial paper programs that have the liquidity support of the committed bank credit arrangements described above. Commercial paper borrowings are included in notes payable in the balance sheets.
Details of short-term borrowings were as follows:
  Short-term Debt at the End of the Period 
Short-term Debt During the Period(*)
  Amount
Outstanding
 Weighted Average Interest Rate Average
Amount Outstanding
 Weighted Average Interest Rate Maximum
Amount
Outstanding
  (in millions)   (in millions)   (in millions)
Successor – December 31, 2017:          
Southern Company Gas Capital $1,243
 1.73% $723
 1.40% $1,243
Nicor Gas 275
 1.83% 176
 1.12% 525
Total $1,518
 1.75% $899
 1.35%  
           
Successor – December 31, 2016:          
Southern Company Gas Capital $733
 1.09% $461
 0.79% $770
Nicor Gas 524
 0.95% 309
 0.67% 587
Total $1,257
 1.03% $770
 0.74%  
           
Predecessor – December 31, 2015:          
Southern Company Gas Capital $471
 0.71% $382
 0.49% $787
Nicor Gas 539
 0.52% 349
 0.38% 585
Total $1,010
 0.60% $731
 0.44%  
(*)Average and maximum amounts are based upon daily balances during the 12-month periods.
The Company believes that the need for working capital can be adequately met by utilizing commercial paper programs, lines of credit, and operating cash flows.
Additionally, Pivotal Utility Holdings is party to a series of loan agreements with the New Jersey Economic Development Authority and Brevard County, Florida under which five series of gas facility revenue bonds totaling $200 million have been issued. The Elizabethtown Gas asset sale agreement requires that bonds representing $180 million of the total that are currently eligible for redemption at par be redeemed on or prior to consummation of the sale.
Financing Activities
The long-term debt on the Company's balance sheets includes both principal and non-principal components. As of December 31, 2017, the non-principal components totaled $508 million, including the amount attributable to long-term debt
Table of ContentsIndex to Financial Statements

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


due within one year, which consisted of the unamortized portions ofamortizes the fair value adjustment recorded in purchase accounting, debt premiums, debt discounts,adjustments over the remaining lives of the respective bonds, the latest being through 2043.
The fair values are determined using Level 2 measurements and debt issuance costs.
In December 2016,are based on quoted market prices for the Company executed intercompany promissory notes to further allocate interest expense to its reportable segments that previously remained insame or similar issues or on the "all other" segment. These intercompany promissory notes allow the Company to calculate net income, which is its performance measure subsequentcurrent rates available to the Merger, at the segment level that incorporates the full impact of interest costs.Registrants.
In May 2017, Southern Company Gas Capital issued $450 million aggregate principal amount of Series 2017A 4.40% Senior Notes due May 30, 2047. The proceeds were used to repay the Company's short-term indebtedness and for general corporate purposes.
In July 2017, Atlanta Gas Light repaid at maturity $22 million of Series C medium-term notes.
On August 10, 2017, Nicor Gas issued $100 million aggregate principal amount of First Mortgage Bonds 3.03% Series due August 10, 2027 and $100 million aggregate principal amount of First Mortgage Bonds 3.62% Series due August 10, 2037. On November 1, 2017, Nicor Gas issued $100 million aggregate principal amount of First Mortgage Bonds 3.85% Series due August 10, 2047 and $100 million aggregate principal amount of First Mortgage Bonds 4.00% Series due August 10, 2057. The proceeds were used to repay short-term indebtedness incurred under the Nicor Gas commercial paper program and for other working capital needs.
On January 4, 2018, the Company issued a floating rate promissory note to Southern Company, in an aggregate principal amount of $100 million due July 31, 2018 bearing interest based on one-month LIBOR, to support the current activities of wholesale gas services.
In addition to any financings that may be necessary to meet capital requirements and contractual obligations, the Company plans to continue, when economically feasible, a program to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit.
Credit Rating Risk14. DERIVATIVES
The Company does not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade.
ThereRegistrants are certain contracts that could require collateral, but not accelerated payment, in the event of a credit rating change below BBB- and/or Baa3. These contracts are for physical gas purchases and sales and energy price risk management. The maximum potential collateral requirement under these contracts at December 31, 2017 was $10 million.
Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. Additionally, a credit rating downgrade could impact the ability of the Company to access capital markets and would be likely to impact the cost at which it does so.
On March 24, 2017, S&P revised its consolidated credit rating outlook for Southern Company and its subsidiaries (including the Company, Southern Company Gas Capital, and Nicor Gas) from stable to negative.
While it is unclear how the credit rating agencies and the relevant state regulatory bodies may respond to the Tax Reform Legislation, certain financial metrics, such as the funds from operations to debt percentage, used by the credit rating agencies to assess Southern Company and its subsidiaries, including the Company, may be negatively impacted. Absent actions by Southern Company and its subsidiaries, including the Company, to mitigate the resulting impacts, which, among other alternatives, could include adjusting capital structure and/or monetizing regulatory assets, the Company's, Southern Company Gas Capital's, and Nicor Gas' credit ratings could be negatively affected. See Note 3 to the financial statements for additional information.
Market Price Risk
The Company is exposed to market risks, primarilyincluding commodity price risk, interest rate risk, weather risk, and weatheroccasionally foreign currency exchange rate risk. Due to various cost recovery mechanisms, the natural gas distribution utilities of the Company that sell natural gas directly to end-use customers have limited exposure to market volatility of natural gas prices. To manage the volatility attributable to these exposures, the Companyeach company nets theits exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company'seach company's policies in areas such as counterparty exposure and risk management practices. TheFor the traditional electric operating companies, Southern Power, and Southern Company usesGas' other businesses, each company's policy is that derivatives are to buy and sell natural gas as well asbe used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis.
Table Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 13 for additional fair value information. In the statements of ContentsIndex to Financial Statements

MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gascash flows, any cash impacts of settled energy-related and Subsidiary Companies 2017 Annual Report


To mitigate future exposure to changes in interest rates, the Company may enter into derivatives designated as hedges. The weighted average interest rate on $200 millionderivatives are recorded as operating activities. Any cash impacts of long-term variablesettled foreign currency derivatives are classified as operating or financing activities to correspond with the classification of the hedged interest rate exposure at December 31, 2017 was 1.71%. If the Company sustained a 100 basis point change in interest rates for all long-term variable interest rate exposure, the change would have an immaterial effect on annualized interest expense at December 31, 2017.or principal, respectively. See Note 1 to the financial statements under "Financial Instruments" and Note 10 to the financial statements"Financial Instruments" for additional information. See Note 15 under "Southern Company Gas" for additional information regarding the sale of Sequent.
CertainEnergy-Related Derivatives
The Subsidiary Registrants enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities have limited exposure to market volatility in energy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas distribution utilities of theSouthern Company Gas manage fuel-hedging programs, implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which are expected to hedgecontinue to mitigate price volatility. The traditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because their long-term sales contracts shift substantially all fuel cost responsibility to the impactpurchaser. However, the traditional electric operating companies and Southern Power may be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, be material and can adversely affect its results of market fluctuationsoperations.
Southern Company Gas also enters into weather derivative contracts as economic hedges in natural gas prices for customers. For the weather risk associated with Nicor Gas, the Company has a corporate weather hedging program that utilizes weather derivatives to reduce the riskevent of lower adjusted operating margins potentially resulting from significantly warmer-than-normal weather. In addition, certain non-regulated operations routinely utilize various types of derivative instruments to economically hedge certain commodity price and weather risks inherentExchange-traded options are carried at fair value, with changes reflected in operating revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the natural gas industry. These instruments include a variety of exchange-traded and over-the-counter (OTC) energy contracts, such as forward contracts, futures contracts, options contracts, and swap agreements. Gas marketing services and wholesale gas services also actively manage storage positions through a variety of hedging transactionsintrinsic value for the purpose of managing exposures arising from changing natural gas prices. These hedging instruments are used to substantially protect economic margins (as spreads between wholesale and retail natural gas prices widen between periods) and thereby minimize exposure to declining operating margins. Some of these economic hedge activities may not qualify, or are not designated, for hedge accounting treatment. The Company had no material change in market risk exposure for the year ended December 31, 2017 when compared to the year ended December 31, 2016.
For the periods presented below, the changes in net fair value of derivative contracts were as follows:
 Successor  Predecessor
 Year Ended December 31, 2017July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016Year Ended December 31, 2015
 (in millions)  (in millions)
Contracts outstanding at beginning of period, assets (liabilities), net$8
$(54)  $75
$61
Contracts realized or otherwise settled(1)18
  (77)(17)
Current period changes(a)
(113)48
  (82)32
Contracts outstanding at end of period, assets (liabilities), net(106)12
  (84)76
Netting of cash collateral193
62
  120
96
Cash collateral and net fair value of contracts outstanding at end of period(b)
$87
$74
  $36
$172
(a)Current period changes also include the changes in fair value of new contracts entered into during the period, if any.
(b)Net fair value of derivative contracts outstanding excludes premium and intrinsic value associated with weather derivatives of $11 million at December 31, 2017 and includes premium and intrinsic value associated with weather derivatives of $4 million at December 31, 2016, $5 million at June 30, 2016, and $10 million at December 31, 2015.
The net hedge volume of energy-related derivative contracts for natural gas positions for the years ended December 31 were as follows:
  2017 2016
  mmBtu Volume
  (in millions)
Commodity – Natural gas 300
 157
Net Purchased/(Sold) Volume 300
 157
The Company's derivativenon-exchange-traded contracts are comprised of both long and short natural gas positions. A long position is a contract to purchase natural gas, and a short position is a contract to sell natural gas. The volume presented above represents the net of long natural gas positions of 3.51 billion mmBtu and short natural gas positions of 3.21 billion mmBtu at December 31, 2017 and the net of long natural gas positions of 3.31 billion mmBtu and short natural gas positions of 3.16 billion mmBtu at December 31, 2016.reflected in operating revenues.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Energy-related derivative contracts that are accounted for under one of three methods:
Regulatory Hedges – Energy-related derivative contracts designated as regulatory hedges relate primarily to the Company'straditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs. Therefore,programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in cost of natural gasfuel expense as the underlying gasfuel is used in operations and ultimately recovered through the respectivean approved cost recovery clause. Certain other gainsmechanism.
Cash Flow Hedges – Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales), are initially deferred in OCIAOCI before being recognized in the statements of income in the same period and in the same income statement line item as the earnings effect of the hedged transaction.transactions.
Not Designated Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred.
Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric and natural gas industry.industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.
At December 31, 2023, the net volume of energy-related derivative contracts for natural gas positions, together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows:
Net
Purchased
mmBtu
Longest
Hedge
Date
Longest
Non-Hedge
Date
(in millions)
Southern Company(*)
44820302028
Alabama Power1182026
Georgia Power1282026
Mississippi Power932028
Southern Power720302024
Southern Company Gas(*)
10220272028
(*)Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of long natural gas positions of 112 million mmBtu and short natural gas positions of 10 million mmBtu at December 31, 2023, which is also included in Southern Company's total volume.
In addition to the volumes discussed above, the traditional electric operating companies and Southern Power enter into physical natural gas supply contracts that provide the option to sell back excess natural gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 12 million mmBtu for Southern Company, uses OTC contractswhich includes 3 million mmBtu for Alabama Power, 4 million mmBtu for Georgia Power, 2 million mmBtu for Mississippi Power, and 3 million mmBtu for Southern Power.
For cash flow hedges of energy-related derivatives, the estimated pre-tax gains (losses) expected to be reclassified from AOCI to earnings for the year ending December 31, 2024 are $(37) million for Southern Company, $(4) million for Southern Power, and $(33) million for Southern Company Gas.
Interest Rate Derivatives
Southern Company and certain subsidiaries may enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and presented on the same income statement line item as the earnings effect of the hedged transactions. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item. Fair value gains or losses on derivatives that are not exchange traded butdesignated or fail to qualify as hedges are fair valued using prices which are market observable, and thus fall into Level 2 of the fair value hierarchy. See Note 9 to the financial statements for further discussion of fair value measurements.
The maturities of the energy-related derivative contracts at December 31, 2017 were as follows:
   Fair Value Measurements
   December 31, 2017
   Maturity
 Total
Fair Value
 Year 1  Years 2 & 3 Years 4 & 5
 (in millions)
Level 1(a)
$(148) $(71) $(59) $(18)
Level 2(b)
42
 10
 30
 2
Fair value of contracts outstanding at end of period(c)
$(106) $(61) $(29) $(16)
(a)Valued using NYMEX futures prices.
(b)Valued using basis transactions that represent the cost to transport natural gas from a NYMEX delivery point to the contract delivery point. These transactions are based on quotes obtained either through electronic trading platforms or directly from brokers.
(c)Excludes cash collateral of $193 million as well as premium and associated intrinsic value associated with weather derivatives of $11 million at December 31, 2017.
Value at Risk (VaR)
VaR is the maximum potential loss in portfolio value over a specified time period that is not expected to be exceeded within a given degree of probability. The Company's VaR may not be comparable to that of other companies due to differencesrecognized in the factors used to calculate VaR. The Company's VaR is determined on a 95% confidence interval and a one-day holding period, which means that 95%statements of the time, the risk of loss in a day from a portfolio of positions is expected to be less than or equal to the amount of VaR calculated. The open exposure of the Company is managed in accordance with established policies that limit market risk and require daily reporting of potential financial exposure to senior management. Because the Company generally manages physical gas assets and economically protects its positions by hedging in the futures markets, the Company's open exposure is generally mitigated. The Company employs daily risk testing, using both VaR and stress testing, to evaluate the risk of its positions.
The Company actively monitors open commodity positions and the resulting VaR and maintains a relatively small risk exposureincome as total buy volume is close to sell volume, with minimal open natural gas price risk. Based on a 95% confidence interval and employing a one-day holding period, SouthStar's portfolio of positions for all periods presented was immaterial.incurred.
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At December 31, 2023, the following interest rate derivatives were outstanding:
Notional
Amount
Weighted Average Interest Rate PaidInterest
Rate
Received
Hedge
Maturity
Date
Fair Value
Gain (Loss) December 31, 2023
(in millions)(in millions)
Cash Flow Hedges of Forecasted Debt
Georgia Power$150 4.01%N/AApril 2024$— 
Mississippi Power75 3.84%N/AJune 2024— 
Mississippi Power75 4.04%N/AJune 2024— 
Fair Value Hedges of Existing Debt
Southern Company parent400 1-month SOFR + 0.80%1.75%March 2028(46)
Southern Company parent1,000 1-month SOFR + 2.48%3.70%April 2030(139)
Southern Company Gas500 1-month SOFR + 0.49%1.75%January 2031(79)
Southern Company$2,200 $(264)
For cash flow hedges of interest rate derivatives, the estimated pre-tax losses expected to be reclassified from AOCI to interest expense for the year ending December 31, 2024 are $19 million for Southern Company and immaterial for the traditional electric operating companies and Southern Company Gas. Deferred gains and losses related to interest rate derivatives are expected to be amortized into earnings through 2054 for Southern Company, Georgia Power, and Mississippi Power, 2052 for Alabama Power, and 2046 for Southern Company Gas.
Foreign Currency Derivatives
Southern Company Gas and Subsidiary Companies 2017 Annual Reportcertain subsidiaries, including Southern Power, may enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and on the same income statement line as the earnings effect of the hedged transactions, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Southern Company has elected to exclude the cross-currency basis spread from the assessment of effectiveness in the fair value hedges of its foreign currency risk and record any difference between the change in the fair value of the excluded components and the amounts recognized in earnings as a component of OCI.

At December 31, 2023, the following foreign currency derivatives were outstanding:
Pay NotionalPay RateReceive NotionalReceive RateHedge
Maturity Date
Fair Value
Gain (Loss) December 31, 2023
(in millions)(in millions) (in millions)
Cash Flow Hedges of Existing Debt
Southern Power$564 3.78%500 1.85%June 2026$(22)
Fair Value Hedges of Existing Debt
Southern Company parent1,476 3.39%1,250 1.88%September 2027(100)
Southern Company$2,040 1,750 $(122)
For cash flow hedges of foreign currency derivatives, the estimated pre-tax losses expected to be reclassified from AOCI to earnings for the year ending December 31, 2024 are $11 million for Southern Power.
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Derivative Financial Statement Presentation and Amounts
The Registrants enter into derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Southern Company and certain subsidiaries also utilize master netting agreements to mitigate exposure to counterparty credit risk. These agreements may contain provisions that permit netting across product lines and against cash collateral. The fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.
The fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected in the balance sheets as follows:
20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Southern Company
Energy-related derivatives designated as hedging instruments for regulatory purposes
Assets from risk management activities/Liabilities from risk management activities$12 $198 $123 $121 
Other deferred charges and assets/Other deferred credits and liabilities31 117 52 44 
Total derivatives designated as hedging instruments for regulatory purposes43 315 175 165 
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Assets from risk management activities/Liabilities from risk management activities 29 27 
Other deferred charges and assets/Other deferred credits and liabilities3 4 
Interest rate derivatives:
Assets from risk management activities/Liabilities from risk management activities 74 12 62 
Other deferred charges and assets/Other deferred credits and liabilities 190 — 240 
Foreign currency derivatives:
Assets from risk management activities/Liabilities from risk management activities 34 — 34 
Other deferred charges and assets/Other deferred credits and liabilities 88 — 182 
Total derivatives designated as hedging instruments in cash flow and fair value hedges3 419 21 549 
Energy-related derivatives not designated as hedging instruments
Assets from risk management activities/Liabilities from risk management activities8 8 13 13 
Other deferred charges and assets/Other deferred credits and liabilities1 2 
Total derivatives not designated as hedging instruments9 10 15 14 
Gross amounts recognized55 744 211 728 
Gross amounts offset(a)
(23)(85)(70)(111)
Net amounts recognized in the Balance Sheets(b)
$32 $659 $141 $617 
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20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Alabama Power(c)
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$6 $69 $42 $21 
Other deferred charges and assets/Other deferred credits and liabilities9 41 20 18 
Total derivatives designated as hedging instruments for regulatory purposes15 110 62 39 
Gross amounts offset(10)(10)(24)(24)
Net amounts recognized in the Balance Sheets$5 $100 $38 $15 
Georgia Power
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$2 $82 $36 $43 
Other deferred charges and assets/Other deferred credits and liabilities10 42 18 
Total derivatives designated as hedging instruments for regulatory purposes12 124 42 61 
Energy-related derivatives not designated as hedging instruments
Other deferred charges and assets/Other deferred credits and liabilities1   
Gross amounts recognized13 124 42 62 
Gross amounts offset(11)(11)(21)(21)
Net amounts recognized in the Balance Sheets$2 $113 $21 $41 
Mississippi Power(c)
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$3 $27 $33 $24 
Other deferred charges and assets/Other deferred credits and liabilities12 34 26 
Total derivatives designated as hedging instruments for regulatory purposes15 61 59 32 
Gross amounts offset(14)(14)(17)(17)
Net amounts recognized in the Balance Sheets$1 $47 $42 $15 
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20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Southern Power
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Other current assets/Other current liabilities$ $5 $— $12 
Other deferred charges and assets/Other deferred credits and liabilities3  — 
Foreign currency derivatives:
Other current assets/Other current liabilities 11 — 11 
Other deferred charges and assets/Other deferred credits and liabilities 11 — 36 
Total derivatives designated as hedging instruments in cash flow and fair value hedges3 27 59 
Energy-related derivatives not designated as hedging instruments
Other current assets/Other current liabilities  — 
Other deferred charges and assets/Other deferred credits and liabilities  — 
Total derivatives not designated as hedging instruments  — 
Net amounts recognized in the Balance Sheets$3 $27 $$59 
Southern Company Gas
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$1 $20 $12 $33 
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Other current assets/Other current liabilities 24 15 
Other deferred charges and assets/Other deferred credits and liabilities 4 
Interest rate derivatives:
Other current assets/Other current liabilities 20 — 14 
Other deferred charges and assets/Other deferred credits and liabilities 59 — 72 
Total derivatives designated as hedging instruments in cash flow and fair value hedges 107 105 
Energy-related derivatives not designated as hedging instruments
Other current assets/Other current liabilities7 8 11 12 
Other deferred charges and assets/Other deferred credits and liabilities1 2 
Total derivatives not designated as hedging instruments8 10 12 13 
Gross amounts recognized9 137 28 151 
Gross amounts offset(a)
12 (50)— (41)
Net amounts recognized in the Balance Sheets(b)
$21 $87 $28 $110 
(a)Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $62 million and $41 million at December 31, 2023 and 2022, respectively.
(b)Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
(c)Energy-related derivatives not designated as hedging instruments were immaterial at December 31, 2022. There were no such instruments at December 31, 2023.
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At December 31, 2023 and 2022, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows:
Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheets
Derivative Category and Balance Sheet
Location
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern Company Gas
 (in millions)
At December 31, 2023:
Energy-related derivatives:
Other regulatory assets, current$(180)$(67)$(80)$(25)$(8)
Other regulatory assets, deferred(87)(32)(33)(22)— 
Other regulatory liabilities, current— 
Other regulatory liabilities, deferred— — — 
Total energy-related derivative gains (losses)$(257)$(95)$(112)$(46)$(4)
At December 31, 2022:
Energy-related derivatives:
Other regulatory assets, current$(71)$(8)$(26)$(13)$(24)
Other regulatory assets, deferred(23)(7)(14)(2)— 
Other regulatory liabilities, current72 29 19 22 
Other regulatory liabilities, deferred31 20 — 
Total energy-related derivative gains (losses)$$23 $(19)$27 $(22)
For the periodsyears ended December 31, 2023, 2022, and 2021, the pre-tax effects of cash flow and fair value hedge accounting on AOCI for the applicable Registrants were as follows:
Gain (Loss) From Derivatives Recognized in OCI202320222021
(in millions)
Southern Company
Cash flow hedges:
Energy-related derivatives$(81)$$34 
Interest rate derivatives(12)46 
Foreign currency derivatives14 (105)(103)
Fair value hedges(*):
Foreign currency derivatives21 (24)(3)
Total$(58)$(80)$(67)
Georgia Power
Cash flow hedges:
Interest rate derivatives$(2)$31 $— 
Southern Power
Cash flow hedges:
Energy-related derivatives$(18)$(15)$12 
Foreign currency derivatives14 (105)(103)
Total$(4)$(120)$(91)
Southern Company Gas
Cash flow hedges:
Energy-related derivatives$(63)$18 $22 
(*)Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI.
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The pre-tax effects of interest rate derivatives designated as cash flow hedging instruments on AOCI were immaterial for Alabama Power for all years presented below, wholesale gas services hadand immaterial for Mississippi Power in 2023.
The pre-tax effects of cash flow and fair value hedge accounting on income for the years ended December 31, 2023, 2022, and 2021 were as follows:
Location and Amount of Gain (Loss) Recognized in Income on Cash Flow and Fair Value Hedging Relationships202320222021
(in millions)
Southern Company
Total cost of natural gas$1,644 $3,004 $1,619 
Gain (loss) on energy-related cash flow hedges(a)
(44)37 17 
Total other operations and maintenance6,093 6,573 5,902 
Gain (loss) on energy-related cash flow hedges(a)
(2)  
Total depreciation and amortization4,525 3,663 3,565 
Gain (loss) on energy-related cash flow hedges(a)
(23)(5)
Total interest expense, net of amounts capitalized(2,446)(2,022)(1,837)
Gain (loss) on interest rate cash flow hedges(a)
(35)(25)(27)
Gain (loss) on foreign currency cash flow hedges(a)
(11)(19)(24)
Gain (loss) on interest rate fair value hedges(b)
37 (291)(30)
Total other income (expense), net553 500 449 
Gain (loss) on foreign currency cash flow hedges(a)(c)
19 (83)(104)
Gain (loss) on foreign currency fair value hedges69 (106)(63)
Amount excluded from effectiveness testing recognized in earnings(21)24 
Southern Power
Total depreciation and amortization$504 $516 $517 
Gain (loss) on energy-related cash flow hedges(a)
(23)(5)
Total interest expense, net of amounts capitalized(129)(138)(147)
Gain (loss) on foreign currency cash flow hedges(a)
(11)(19)(24)
Total other income (expense), net12 7 10 
Gain (loss) on foreign currency cash flow hedges(a)(c)
19 (83)(104)
Southern Company Gas
Total cost of natural gas$1,644 $3,004 $1,619 
Gain (loss) on energy-related cash flow hedges(a)
(44)37 17 
Total other operations and maintenance1,194 1,176 1,072 
Gain (loss) on energy-related cash flow hedges(a)
(2)  
Total interest expense, net of amounts capitalized(310)(263)(238)
Gain (loss) on interest rate cash flow hedges(a)
(19)(4)— 
Gain (loss) on interest rate fair value hedges(b)
(86)— 
(a)Reclassified from AOCI into earnings.
(b)For fair value hedges, changes in the fair value of the derivative contracts are generally equal to changes in the fair value of the underlying debt and have no material impact on income.
(c)The reclassification from AOCI into other income (expense), net completely offsets currency gains and losses arising from changes in the U.S. currency exchange rates used to record the euro-denominated notes.
The pre-tax effects of cash flow hedge accounting on income for interest rate derivatives were immaterial for the traditional electric operating companies for all years presented.
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At December 31, 2023 and 2022, the following VaRs:amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges:
Carrying Amount of
the Hedged Item
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item
Balance Sheet Location of Hedged ItemsAt December 31, 2023At December 31, 2022At December 31, 2023At December 31, 2022
(in millions)(in millions)
Southern Company
Long-term debt$(3,024)$(2,927)$235 $282 
Southern Company Gas
Long-term debt$(427)$(415)$70 $81 
 Successor  Predecessor
 Year Ended December 31, 2017July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016Year Ended December 31, 2015
 (in millions)  (in millions)
Period end(*)
$4.8
$2.3
  $1.9
$2.4
Average2.0
2.0
  2.0
3.0
High(*)
4.8
2.8
  2.5
7.3
Low1.0
1.4
  1.6
1.6
(*)Increase in VaR at December 31, 2017 was driven by significant natural gas price increases in Sequent's key markets due to colder-than-normal weather. As weather moderated during January 2018, VaR reduced to a level consistent with prior periods.
The pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income of Southern Company and Southern Company Gas for the years ended December 31, 2023, 2022, and 2021 were as follows:
Credit Risk
Gain (Loss)
Derivatives in Non-Designated Hedging RelationshipsStatements of Income Location202320222021
(in millions)
Energy-related derivatives
Natural gas revenues(*)
$ $(11)$(117)
Cost of natural gas59 (65)(27)
Total derivatives in non-designated hedging relationships$59 $(76)$(144)
Gas Distribution Operations(*)    Excludes the impact of weather derivatives recorded in natural gas revenues of $15 million and $(7) million for 2023 and 2022, respectively, as they are accounted for based on intrinsic value rather than fair value. There was no weather derivatives impact for 2021.
ConcentrationThe pre-tax effects of energy-related derivatives not designated as hedging instruments were immaterial for all other Registrants for all years presented.
Contingent Features
The Registrants do not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain Southern Company subsidiaries. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, risk occurs at Atlanta Gas Light for amounts billed for servicesor cash. At December 31, 2023, the Registrants had no collateral posted with derivative counterparties to satisfy these arrangements.
For Southern Company, the fair value of foreign currency derivative liabilities and other costs to its customers, which consist of 15 Marketers in Georgia. The credit risk exposure to Marketers varies seasonally,interest rate derivative liabilities with the lowest exposure in the non-peak summer monthscontingent features, and the highest exposure inmaximum potential collateral requirements arising from the peak winter months. Marketers are responsiblecredit-risk-related contingent features at a rating below BBB- and/or Baa3, was $52 million at December 31, 2023. For Southern Power, the fair value of foreign currency derivative liabilities with contingent features, and the maximum potential collateral requirements arising from the credit-risk-related contingent features at a rating below BBB- and/or Baa3, was immaterial at December 31, 2023. For the traditional electric operating companies and Southern Power, energy-related derivative liabilities with contingent features and the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were immaterial at December 31, 2023. The maximum potential collateral requirements arising from the credit-risk-related contingent features for the retail sale of natural gas to end-use customers in Georgia. The functions of the retail sale of gastraditional electric operating companies and Southern Power include the purchase and sale of natural gas, customer service, billings, and collections. The provisions of Atlanta Gas Light's tariff allow Atlanta Gas Light to obtain credit security support in an amount equal to a minimum of two times a Marketer's highest month's estimated bill from Atlanta Gas Light. For 2017, the four largest Marketers based on customer count accounted for 19% of the Company's adjusted operating margin and 22% of gas distribution operations' adjusted operating margin.
Several factors are designed to mitigate the Company's risks from the increased concentration of creditcertain agreements that has resulted from deregulation. In addition to the security support described above, Atlanta Gas Light bills intrastate delivery service to Marketers in advance rather than in arrears. Atlanta Gas Light accepts credit support in the form of cash deposits, letters of credit/surety bonds from acceptable issuers, and corporate guarantees from investment-grade entities. On a monthly basis, the Risk Management Committee reviews the adequacy of credit support coverage, credit rating profiles of credit support providers, and payment status of each Marketer. The Company believes that adequate policies and procedures are in place to properly quantify, manage, and report on Atlanta Gas Light's credit risk exposure to Marketers.
Atlanta Gas Light also faces potential credit risk in connection with assignments of interstate pipeline transportation and storage capacity to Marketers. Although Atlanta Gas Light assigns this capacity to Marketers,could require collateral in the event that a Marketer fails to pay the interstate pipelines for the capacity, the interstate pipelines would likely seek repayment from Atlanta Gas Light.
Gas Marketing Services
Theone or more Southern Company obtains credit scores for its firm residential and small commercial customers usingpower pool participants has a national credit reporting agency, enrolling only those customers that meet or exceed the Company's credit threshold. The Company considers potential interruptible and large commercial customers based on reviews of publicly available financial statements and commercially available credit reports. Prior to entering into a physical transaction, the Company also assigns physical wholesale counterparties an internal credit rating change to below investment grade.
Alabama Power and credit limitSouthern Power maintain accounts with certain regional transmission organizations to facilitate financial derivative transactions and they may be required to post collateral based on the value of the positions in these accounts and the associated margin requirements. At December 31, 2023, cash collateral posted in these accounts was immaterial for Alabama Power and Southern Power. Southern Company Gas maintains accounts with brokers or the clearing houses of certain exchanges to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, Southern Company Gas may be required to deposit cash into these accounts. At December 31, 2023, cash collateral held on deposit in broker margin accounts was $62 million.
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The Registrants are exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Registrants only enter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Registrants have also established risk management policies and Fitch ratings, commercially available credit reports, and audited financial statements.
Wholesale Gas Services
The Company has established credit policiescontrols to determine and monitor the creditworthiness of counterparties as well as the quality of pledged collateral. The Company also utilizes master netting agreements whenever possiblein order to mitigate their exposure to counterparty credit risk. When the Company is engaged in more than one outstanding derivative transaction with the same counterparty and also has a legally enforceable netting agreement with that counterparty, the "net" mark-to-market exposure represents the netting of the positive and negative exposures with that counterparty and a reasonable measure of the Company's credit risk. The Company also uses other netting agreements with certain counterparties with whom it conducts significant transactions. Master netting agreements enable the Company to net certain assets and liabilities by counterparty. The Company also nets across product lines and against cash collateral, provided the master netting and cash collateral agreements include such provisions.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


The Company may require counterparties to pledge additional collateral when deemed necessary. The Company conductsuses established credit evaluations and obtains appropriate internal approvals for a counterparty's line of credit before any transaction with the counterparty is executed. In most cases, the counterparty must have an investment grade rating, which includes a minimum long-term debt rating of Baa3 from Moody's and BBB- from S&P. Generally, the Company requires credit enhancements by way of a guaranty, cash deposit, or letter of credit for transaction counterparties that do not have investment grade ratings.
Certain of the Company's derivative instruments contain credit-risk-related or other contingent features that could increase the payments for collateral it posts in the normal course of business when its financial instruments are in net liability positions. At December 31, 2017, for agreements with such features, the Company's derivative instruments with liability fair values totaled $1 million for which the Company had no collateral posted with derivatives counterparties to satisfy these arrangements.
The Company has a concentration of credit risk as measured by its 30-day receivable exposure plus forward exposure. At December 31, 2017, wholesale gas services' top 20 counterparties represented approximately 48%, or $203 million, of its total counterparty exposure and had a weighted average S&P equivalent credit rating of A-, all of which is consistent with the prior year. The S&P equivalent credit rating is determined by a process of converting the lower of the S&P or Moody's ratings to an internal rating ranging from 9 to 1, with 9 being equivalent to AAA/Aaa by S&P and Moody's, respectively, and 1 being D / Default by S&P and Moody's, respectively. A counterparty that does not have an external rating is assigned an internal rating based on the strength of the financial ratios of that counterparty. To arrive at the weighted average credit rating, each counterparty is assigned an internal ratio, which is multiplied by their credit exposure and summed for all counterparties. The sum is divided by the aggregate total counterparties' exposures, and this numeric value is then converted to an S&P equivalent.
The following table provides credit risk information related to the Company's third-party natural gas contracts receivable and payable positions at December 31:
 Gross Receivables Gross Payables
 2017 2016 2017 2016
 (in millions) (in millions)
Netting agreements in place:       
Counterparty is investment grade$342
 $375
 $202
 $227
Counterparty is non-investment grade20
 14
 25
 31
Counterparty has no external rating226
 223
 315
 339
No netting agreements in place:       
Counterparty is investment grade19
 11
 4
 
Amount recorded in balance sheets$607
 $623
 $546
 $597
Capital Requirements and Contractual Obligations
The Company's capital investments are currently estimated to total $1.7 billion for 2018, $1.7 billion for 2019, $1.5 billion for 2020, $1.2 billion for 2021, and $1.4 billion for 2022. The Company's capital investments include estimated capital expenditures related to Elizabethtown Gas and Elkton Gas of $123 million for 2018, $125 million for 2019, $124 million for 2020, $126 million for 2021, and $129 million for 2022. See Note 11 to the financial statements under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for additional information. The regulatory infrastructure programs and other construction programs are subject to periodic review and revision, and actual costs may vary from these estimates because of numerous factors. These factors include: changes in business conditions; changes in FERC rules and regulations; state regulatory agency approvals; changes in legislation; the cost and efficiency of labor, equipment, and materials; project scope and design changes; and the cost of capital. In addition, there can be no assurance that costs related to capital expenditures will be fully recovered.
In addition, as discussed in Note 2 to the financial statements, the Company provides postretirement benefits to certain eligible employees and funds trusts to the extent required by the applicable state regulatory agencies.
Other funding requirements related to obligations associated with scheduled maturities of long-term debt, including the related interest; pipeline charges, storage capacity, and gas supply; operating leases; asset management agreements; financial derivative obligations; pension and other postretirement benefit plans; and other purchase commitments, primarily related to environmental remediation liabilities, are detailed in the contractual obligations table that follows. See Notes 3, 6, 7, and 11 to the financial statements for additional information.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Contractual Obligations
Contractual obligations at December 31, 2017 were as follows:
 2018 2019-
2020
 2021-
2022
 After
2022
 Total
 (in millions)
Long-term debt(a) —
         
Principal$155
 $350
 $423
 $4,612
 $5,540
Interest241
 452
 421
 3,137
 4,251
Pipeline charges, storage capacity, and gas supply(b)
813
 968
 714
 2,294
 4,789
Operating leases(c)
17
 32
 28
 26
 103
Asset management agreements(d)
9
 6
 
 
 15
Financial derivative obligations(e)
444
 174
 37
 5
 660
Pension and other postretirement benefit plans(f)
13
 28
 
 
 41
Purchase commitments —         
Capital(g)
1,821
 2,979
 2,662
 
 7,462
Other(h)
31
 7
 2
 1
 41
Total$3,544
 $4,996
 $4,287
 $10,075
 $22,902
(a)Amounts are reflected based on final maturity dates. The Company plans to continue, when economically feasible, to retire higher-cost securities and replace these obligations with lower-cost capital if market conditions permit. Variable rate interest obligations are estimated based on rates at December 31, 2017, as reflected in the statements of capitalization.
(b)Includes charges recoverable through a natural gas cost recovery mechanism, or alternatively billed to Marketers, and demand charges associated with Sequent. The gas supply balance includes amounts for Nicor Gas and SouthStar gas commodity purchase commitments of 35 million mmBtu at floating gas prices calculated using forward natural gas prices at December 31, 2017 and valued at $101 million. The Company provides guarantees to certain gas suppliers for certain of its subsidiaries, including SouthStar, in support of payment obligations.
(c)Certain operating leases have provisions for step rent or escalation payments and certain lease concessions are accounted for by recognizing the future minimum lease payments on a straight-line basis over the respective minimum lease terms. However, this accounting treatment does not affect the future annual operating lease cash obligations as shown herein. In terms of rental charges and duration of contracts, the Company's most significant operating leases relate to real estate.
(d)Represent fixed-fee minimum payments for Sequent's affiliated asset management agreements.
(e)See Notes 1 and 10 to the financial statements for additional information.
(f)The Company forecasts contributions to the pension and other postretirement benefit plans over a three-year period. The Company anticipates no mandatory contributions to the qualified pension plan during the next three years. Amounts presented represent estimated benefit payments for the nonqualified pension plans, estimated non-trust benefit payments for the other postretirement benefit plans, and estimated contributions to the other postretirement benefit plan trusts, all of which will be made from the Company's corporate assets. See Note 2 to the financial statements for additional information related to the pension and other postretirement benefit plans, including estimated benefit payments. Certain benefit payments will be made through the related benefit plans. Other benefit payments will be made from the Company's corporate assets.
(g)Estimated capital expenditures are provided through 2022. Capital includes amounts related to Elizabethtown Gas and Elkton Gas, which represent $123 million in 2018, $249 million in 2019-2020, and $255 million in 2021-2022. See Note 11 to the financial statements under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for additional information. Capital also includes amounts related to the Company's pipeline investments that will be recorded at the joint venture level, which represent $64 million in 2018, $195 million in 2019-2020, and less than $1 million in capital expenditures in 2021-2022.
(h)Includes contractual environmental remediation liabilities that are generally recoverable through base rates or rate rider mechanisms and long-term service agreements.
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Cautionary Statement Regarding Forward-Looking Statements
The Company's 2017 Annual Report contains forward-looking statements. Forward-looking statements include, among other things, statements concerning regulatory matters, the strategic goals for the Company, economic conditions, natural gas price volatility, derivative losses, regulatory and environmental cost recovery and other rate actions, current and proposed environmental regulations and related compliance plans and estimated expenditures, pending or potential litigation matters, access to sources of capital, projections for the qualified pension plan contributions, financing activities, completion dates of construction projects, completion of announced acquisitions or dispositions, filings with state and federal regulatory authorities, impacts of the Tax Reform Legislation, and estimated other plans and expenditures. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "could," "should," "expects," "plans," "anticipates," "believes," "estimates," "projects," "predicts," "potential," or "continue" or the negative of these terms or other similar terminology. There are various factors that could cause actual results to differ materially from those suggested by the forward-looking statements; accordingly, there can be no assurance that such indicated results will be realized. These factors include:
the impact of recent and future federal and state regulatory changes, including environmental laws and regulations governing air, water, land, and protection of other natural resources, and also changes in tax and other laws and regulations to which the Company is subject, as well as changes in application of existing laws and regulations;
the uncertainty surrounding the recently enacted Tax Reform Legislation, including implementing regulations and IRS interpretations, actions that may be taken in response by regulatory authorities, and its impact, if any, on the credit ratings of the Company, Southern Company Gas Capital, and Nicor Gas;
current and future litigation or regulatory investigations, proceedings, or inquiries;
the effects, extent, and timing of the entry of additional competition in the markets in which the Company operates;
variations in demand for natural gas, including those relating to weather, the general economy, population and business growth (and declines), the effects of energy conservation and efficiency measures, including from the development and deployment of alternative energy sources, and any potential economic impacts resulting from federal fiscal decisions;
available sources and costs of natural gas;
limits on pipeline capacity;
effects of inflation;
the ability to control costs and avoid cost overruns during the development and construction of facilities;
investment performance of the Company's employee and retiree benefit plans;
advances in technology;
state and federal rate regulations and the impact of pending and future rate cases and negotiations, including rate actions relating to natural gas and other cost recovery mechanisms;
the inherent risks involved in transporting and storing natural gas;
the ability to successfully operate the natural gas distribution and storage facilities and the successful performance of necessary corporate functions;
internal restructuring or other restructuring options that may be pursued;
potential business strategies, including acquisitions or dispositions of assets or businesses, including the proposed disposition of Elizabethtown Gas and Elkton Gas, which cannot be assured to be completed or beneficial to the Company;
the possibility that the anticipated benefits from the Merger cannot be fully realized or may take longer to realize than expected and the possibility that costs related to integration with Southern Company will be greater than expected;
the ability of counterparties of the Company to make payments as and when due and to perform as required;
the direct or indirect effect on the Company's business resulting from cyber intrusion or physical attack and the threat of physical attacks;
interest rate fluctuations and financial market conditions and the results of financing efforts;
changes in the Company's, Southern Company Gas Capital's, and Nicor Gas' credit ratings, including impacts on interest rates, access to capital markets, and collateral requirements;
the impacts of any sovereign financial issues, including impacts on interest rates, access to capital markets, impacts on foreign currency exchange rates, counterparty performance, and the economy in general;
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MANAGEMENT'S DISCUSSION AND ANALYSIS (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes and other storms, droughts, pandemic health events such as influenzas, or other similar occurrences;
the direct or indirect effects on the Company's business resulting from incidents affecting the U.S. natural gas pipeline infrastructure or operation of storage resources;
impairments of goodwill or long-lived assets;
the effect of accounting pronouncements issued periodically by standard-setting bodies; and
other factors discussed elsewhere herein and in other reports filed by the Company from time to time with the SEC.
The Company expressly disclaims any obligation to update any forward-looking statements.
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CONSOLIDATED STATEMENTS OF INCOME
Southern Company Gas and Subsidiary Companies 2017 Annual Report

  Successor  Predecessor
  For the year ended
December 31,
 July 1, 2016 through December 31,  January 1, 2016 through June 30, 
For the year ended
December 31,
  2017 2016  2016 2015
  (in millions)  (in millions)
Operating Revenues:         
Natural gas revenues (includes revenue taxes of
$100, $32, $57, and $103 for the periods presented,
respectively)
 $3,791
 $1,596
  $1,841
 $3,817
Other revenues 129
 56
  64
 124
Total operating revenues 3,920
 1,652
  1,905
 3,941
Operating Expenses:         
Cost of natural gas 1,601
 613
  755
 1,617
Cost of other sales 29
 10
  14
 28
Other operations and maintenance 940
 482
  454
 928
Depreciation and amortization 501
 238
  206
 397
Taxes other than income taxes 184
 71
  99
 181
Merger-related expenses 
 41
  56
 44
Total operating expenses 3,255
 1,455
  1,584
 3,195
Operating Income 665
 197
  321
 746
Other Income and (Expense):         
Earnings from equity method investments 106
 60
  2
 6
Interest expense, net of amounts capitalized (200) (81)  (96) (175)
Other income (expense), net 39
 14
  5
 9
Total other income and (expense) (55) (7)  (89) (160)
Earnings Before Income Taxes 610
 190
  232
 586
Income taxes 367
 76
  87
 213
Net Income 243
 114
  145
 373
Less: Net income attributable to noncontrolling interest 
 
  14
 20
Net Income Attributable to Southern Company Gas $243
 $114
  $131
 $353
The accompanying notes are an integral part of these consolidated financial statements.

Table of ContentsIndex to Financial Statements

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Southern Company Gas and Subsidiary Companies 2017 Annual Report

  Successor  Predecessor
  For the year ended
December 31,
 July 1, 2016 through December 31,  January 1, 2016 through June 30, 
For the year ended
December 31,
  2017 2016  2016 2015
  (in millions)  (in millions)
Net Income $243
 $114
  $145
 $373
Other comprehensive income (loss):         
Qualifying hedges:         
Changes in fair value, net of tax of
$(3), $(1), $(23), and $(3), respectively
 (5) (1)  (41) 
Reclassification adjustment for amounts included
in net income, net of tax of $-, $-, $-, and $1,
respectively
 1
 
  1
 8
Pension and other postretirement benefit plans:         
Benefit plan net gain (loss), net of tax of
$-, $19, $-, and $-, respectively
 (1) 27
  
 
Reclassification adjustment for amounts included
in net income, net of tax of $-, $-, $4, and $9,
respectively
 
 
  5
 12
Total other comprehensive income (loss) (5) 26
  (35) 20
Less: Comprehensive income attributable to
   noncontrolling interest
 
 
  14
 20
Comprehensive Income Attributable to
Southern Company Gas
 $238
 $140
  $96
 $373
The accompanying notes are an integral part of these consolidated financial statements.

Table of ContentsIndex to Financial Statements

CONSOLIDATED STATEMENTS OF CASH FLOWS
Southern Company Gas and Subsidiary Companies 2017 Annual Report
  Successor  Predecessor
  For the year ended
December 31,
 July 1, 2016 through December 31,  January 1,
2016 through June 30,
 
For the year ended
December 31,
  2017 2016  2016 2015
  (in millions)  (in millions)
Operating Activities:         
Net income $243
 $114
  $145
 $373
Adjustments to reconcile net income to net cash
provided from (used for) operating activities —
         
Depreciation and amortization, total 501
 238
  206
 397
Deferred income taxes 236
 92
  8
 211
Pension, postretirement, and other employee benefits (1) 6
  5
 24
Pension and postretirement funding 
 (125)  
 
Stock based compensation expense 32
 20
  20
 34
Hedge settlements 
 (35)  (26) 
Goodwill impairment 
 
  
 14
Mark-to-market adjustments (24) (3)  162
 22
Other, net (83) (78)  (82) 43
Changes in certain current assets and liabilities —         
-Receivables (91) (490)  181
 615
-Natural gas for sale, net of
   temporary LIFO liquidation
 36
 (226)  273
 72
-Prepaid income taxes (39) (23)  151
 23
-Other current assets (24) (31)  37
 (11)
-Accounts payable (20) 194
  43
 (434)
-Accrued taxes 110
 8
  41
 (20)
-Accrued compensation 15
 (13)  (21) (6)
-Other current liabilities (8) 24
  (30) 24
Net cash provided from (used for) operating activities 883
 (328)  1,113
 1,381
Investing Activities:         
Property additions (1,514) (614)  (509) (961)
Cost of removal, net of salvage (66) (40)  (32) (84)
Change in construction payables, net 72
 22
  (7) 18
Investment in unconsolidated subsidiaries (145) (1,444)  (14) (12)
Returned investment in unconsolidated subsidiaries 80
 5
  3
 12
Other investing activities 3
 4
  
 
Net cash used for investing activities (1,570) (2,067)  (559) (1,027)
Financing Activities:         
Increase (decrease) in notes payable, net 262
 1,143
  (896) (165)
Proceeds —         
First mortgage bonds 400
 
  250
 
Capital contributions from parent company 103
 1,085
  
 
Senior notes 450
 900
  350
 250
Redemptions and repurchases —         
Medium-term notes (22) 
  
 
First mortgage bonds 
 
  (125) 
Senior notes 
 (420)  
 (200)
Distribution to noncontrolling interest 
 (15)  (19) (18)
Purchase of 15% noncontrolling interest in SouthStar 
 (160)  
 
Payment of common stock dividends (443) (126)  (128) (244)
Other financing activities (9) (8)  10
 11
Net cash provided from (used for) financing activities 741
 2,399
  (558) (366)
Net Change in Cash and Cash Equivalents 54
 4
  (4) (12)
Cash and Cash Equivalents at Beginning of Period 19
 15
  19
 31
Cash and Cash Equivalents at End of Period $73
 $19
  $15
 $19
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2017 and 2016
Southern Company Gas and Subsidiary Companies 2017 Annual Report

Assets 2017 2016
  (in millions)
Current Assets:    
Cash and cash equivalents $73
 $19
Receivables —    
Energy marketing receivable 607
 623
Customer accounts receivable 400
 364
Unbilled revenues 285
 239
Other accounts and notes receivable 103
 76
Accumulated provision for uncollectible accounts (28) (27)
Materials and supplies 24
 26
Natural gas for sale 595
 631
Prepaid income taxes 26
 24
Prepaid expenses 53
 55
Assets from risk management activities, net of collateral 135
 128
Other regulatory assets, current 94
 81
Other current assets 28
 11
Total current assets 2,395
 2,250
Property, Plant, and Equipment:    
In service 15,833
 14,508
Less: Accumulated depreciation 4,596
 4,439
Plant in service, net of depreciation 11,237
 10,069
Construction work in progress 491
 496
Total property, plant, and equipment 11,728
 10,565
Other Property and Investments:    
Goodwill 5,967
 5,967
Equity investments in unconsolidated subsidiaries 1,477
 1,541
Other intangible assets, net of amortization of $120 and $34
at December 31, 2017 and December 31, 2016, respectively
 280
 366
Miscellaneous property and investments 21
 21
Total other property and investments 7,745
 7,895
Deferred Charges and Other Assets:    
Other regulatory assets, deferred 901
 973
Other deferred charges and assets 218
 170
Total deferred charges and other assets 1,119
 1,143
Total Assets $22,987
 $21,853
The accompanying notes are an integral part of these consolidated financial statements.
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CONSOLIDATED BALANCE SHEETS
At December 31, 2017 and 2016
Southern Company Gas and Subsidiary Companies 2017 Annual Report

Liabilities and Stockholder's Equity 2017 2016
  (in millions)
Current Liabilities:    
Securities due within one year $157
 $22
Notes payable 1,518
 1,257
Energy marketing trade payables 546
 597
Accounts payable 446
 348
Customer deposits 128
 153
Accrued taxes —    
Accrued income taxes 40
 26
Other accrued taxes 78
 68
Accrued interest 51
 48
Accrued compensation 74
 58
Liabilities from risk management activities, net of collateral 69
 62
Other regulatory liabilities, current 135
 102
Accrued environmental remediation, current 46
 69
Other current liabilities 113
 108
Total current liabilities 3,401
 2,918
Long-term Debt (See accompanying statements)
 5,891
 5,259
Deferred Credits and Other Liabilities:    
Accumulated deferred income taxes 1,089
 1,975
Deferred credits related to income taxes 1,063
 22
Employee benefit obligations 415
 441
Other cost of removal obligations 1,646
 1,616
Accrued environmental remediation, deferred 342
 357
Other regulatory liabilities, deferred 30
 29
Other deferred credits and liabilities 88
 127
Total deferred credits and other liabilities 4,673
 4,567
Total Liabilities 13,965
 12,744
Common Stockholder's Equity (See accompanying statements)
 9,022
 9,109
Total Liabilities and Stockholder's Equity $22,987
 $21,853
Commitments and Contingent Matters (See notes)
 
 
The accompanying notes are an integral part of these consolidated financial statements.

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CONSOLIDATED STATEMENTS OF CAPITALIZATION
At December 31, 2017 and 2016
Southern Company Gas and Subsidiary Companies 2017 Annual Report
 2017
 2016
 2017
 2016
 (in millions) (percent of total)
Long-Term Debt:       
Long-term notes payable —       
7.20% due 2017$
 $22
    
3.50% due 2018155
 155
    
5.25% due 2019300
 300
    
3.50% to 9.10% due 2021330
 330
    
8.55% to 8.70% due 202246
 46
    
2.45% to 7.30% due 2023-20473,484
 3,034
    
Total long-term notes payable4,315
 3,887
    
Other long-term debt —       
First mortgage bonds —       
4.70% due 201950
 50
    
2.66% to 6.58% due 2023-2057975
 575
    
Gas facility revenue bonds —       
Variable rate (1.71% at 12/31/17) due 202247
 47
    
Variable rate (1.71% at 12/31/17) due 2024-2033153
 153
    
Total other long-term debt1,225
 825
    
Unamortized fair value adjustment of long-term debt525
 578
    
Unamortized debt discount(17) (9)    
Total long-term debt (annual interest requirement — $241 million)6,048
 5,281
    
Less amount due within one year157
 22
    
Long-term debt excluding amount due within one year5,891
 5,259
 39.5% 36.6%
Common Stockholder's Equity:       
Common stock — par value $0.01 per share       
Authorized — 100 million shares       
Outstanding — 100 shares       
Paid-in capital9,214
 9,095
    
Accumulated deficit(212) (12)    
Accumulated other comprehensive income20
 26
    
Total common stockholder's equity9,022
 9,109
 60.5
 63.4
Total Capitalization$14,913
 $14,368
 100.0% 100.0%
The accompanying notes are an integral part of these financial statements.
Table of ContentsIndex to Financial Statements

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
Southern Company Gas and Subsidiary Companies 2017 Annual Report
 Southern Company Gas Common Stockholders' Equity   
 Number of Common Shares Common Stock   
Accumulated
Other
Comprehensive Income
(Loss)
 
Noncontrolling
Interests
 
 Issued Treasury Par Value Paid-In Capital Treasury Retained Earnings (Accumulated Deficit)  Total
 (in thousands) (in millions)
Predecessor –
Balance at December 31, 2014
119,647
 217
 $599
 $2,087
 $(8) $1,312
 $(206) $44
$3,828
Consolidated net income
   attributable to
   Southern Company Gas

 
 
 
 
 353
 
 
353
Other comprehensive income
   (loss)

 
 
 
 
 
 20
 
20
Stock issued221
 
 1
 11
 
 
 
 
12
Stock-based compensation509
 
 3
 1
 
 
 
 
4
Cash dividends on common stock
 
 
 
 
 (244) 
 
(244)
Distribution to
   noncontrolling interest(*)

 
 
 
 
 
 
 (18)(18)
Net income attributable
   to noncontrolling interest (*)

 
 
 
 
 
 
 20
20
Predecessor –
Balance at December 31, 2015
120,377
 217
 603
 2,099
 (8) 1,421
 (186) 46
3,975
Consolidated net income
   attributable to
   Southern Company Gas

 
 
 
 
 131
 
 
131
Other comprehensive income
   (loss)

 
 
 
 
 
 (35) 
(35)
Stock issued95
 
 
 6
 
 
 
 
6
Stock-based compensation270
 
 2
 28
 
 
 
 
30
Cash dividends on common stock
 
 
 
 
 (128) 
 
(128)
Reclassification of
   noncontrolling interest (*)

 
 
 
 
 
 
 (46)(46)
Predecessor –
Balance at June 30, 2016
120,742
 217
 605
 2,133
 (8) 1,424
 (221) 
3,933
Successor –
Balance at July 1, 2016

 
 
 8,001
 
 
 
 
8,001
Consolidated net income
   attributable to
   Southern Company Gas

 
 
 
 
 114
 
 
114
Capital contributions from parent
company

 
 
 1,094
 
 
 
 
1,094
Other comprehensive income
   (loss)

 
 
 
 
 
 26
 
26
Cash dividends on common stock
 
 
 
 
 (126) 
 
(126)
Successor –
Balance at December 31, 2016

 
 
 9,095
 
 (12) 26
 
9,109
Consolidated net income
   attributable to
   Southern Company Gas

 
 
 
 
 243
 
 
243
Capital contributions from
   parent company, net

 
 
 117
 
 
 
 
117
Other comprehensive income
   (loss)

 
   
 
 
 (5) 
(5)
Cash dividends on common stock
 
 
 
 
 (443) 
 
(443)
Other
 
 
 2
 
 
 (1) 
1
Successor –
Balance at December 31, 2017

 
 $
 $9,214
 $
 $(212) $20
 $
$9,022
(*)Associated with SouthStar. See Note 4 to the financial statements for additional information.
The accompanying notes are an integral part of these consolidated financial statements. 
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NOTES TO FINANCIAL STATEMENTS
Southern Company Gas and Subsidiary Companies 2017 Annual Report




Index to the Notes to Financial Statements

NotePage
1
2
3
4
5
6
7
8
9
10
11
12
13
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
General
On July 1, 2016, Southern Company and Southern Company Gas (together with its subsidiaries, the Company) completed the Merger and Southern Company Gas became a wholly-owned, direct subsidiary of Southern Company. In addition to the Company, Southern Company is the parent company of four traditional electric operating companies, Southern Power, SCS, Southern Linc, Southern Holdings, Southern Nuclear, PowerSecure, Inc., and other direct and indirect subsidiaries. The Company is an energy services holding company whose primary business is the distribution of natural gas across seven states through its seven natural gas distribution utilities. The Company also is involved in several other businesses that are complementary to the distribution of natural gas. The traditional electric operating companies – Alabama Power Company, Georgia Power Company, Gulf Power Company, and Mississippi Power Company – are vertically integrated utilities providing electric service in four Southeastern states. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects, and sells electricity at market-based rates in the wholesale market. SCS, the system service company, provides, at cost, specialized services to Southern Company and its subsidiary companies. Southern Linc provides digital wireless communications for use by Southern Company and its subsidiary companies and also markets these services to the public and provides fiber optics services within the Southeast. Southern Holdings is an intermediate holding company subsidiary, primarily for Southern Company's investments in leveraged leases and for other electric services. Southern Nuclear operates and provides services to the Southern Company system's nuclear power plants. PowerSecure, Inc. is a provider of products and services in the areas of distributed generation, energy efficiency, and utility infrastructure.
The financial statements reflect the Company's investments in its subsidiaries on a consolidated basis. The equity method is used for subsidiaries in which the Company has significant influence but does not control and for VIEs where the Company has an equity investment, but is not the primary beneficiary. Intercompany transactions have been eliminated in consolidation.
The seven natural gas distribution utilities are subject to regulation by the regulatory agencies of each state in which they operate. As such, the Company's financial statements reflect the effects of rate regulation in accordance with GAAP and comply with the accounting policies and practices prescribed by its regulatory commissions. The preparation of financial statements in conformity with GAAP requires the use of estimates, and the actual results may differ from those estimates.
Pursuant to the Merger, Southern Company has pushed down the application of the acquisition method of accounting to the financial statements of the Company such that the assets and liabilities are recorded at their respective fair values, and goodwill has been established for the excess of the purchase price over the fair value of net identifiable assets. Accordingly, the financial statements of the Company for periods before and after July 1, 2016 (acquisition date) reflect different bases of accounting, and the financial positions and results of operations of those periods are not comparable. Throughout the financial statements and notes to the financial statements, periods prior to July 1, 2016 are identified as "predecessor," while periods after the acquisition date are identified as "successor."
Certain predecessor period data presented in the financial statements has been modified or reclassified to conform to the presentation used by the Company's new parent company, Southern Company. Changes to the statements of income include classifying operating revenues as natural gas revenues and other revenues as well as classifying cost of goods sold as cost of natural gas and cost of other sales, and presenting interest expense and AFUDC on a gross basis. Changes to the statements of cash flows include revised financial statement line item descriptions to align with the new balance sheet descriptions and expanded line items within each category of cash flow activity. Changes to the balance sheets include changing certain captions to conform to the presentation of Southern Company.
Recently Issued Accounting Standards
Revenue
In 2014, the FASB issued ASC 606, Revenue from Contracts with Customers (ASC 606), replacing the existing accounting standard and industry specific guidance for revenue recognition with a five-step model for recognizing and measuring revenue from contracts with customers. The underlying principle of the new standard is to recognize revenue to depict the transfer of goods or services to customers at the amount expected to be collected. The new standard also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows arising from contracts with customers.
Most of the Company's revenue, including energy provided to customers, is from tariff offerings that provide natural gas without a defined contractual term, as well as longer-term contractual agreements, including non-derivative natural gas asset management and optimization arrangements.
Table of ContentsIndex to Financial Statements

NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


The Company has completed the evaluation of all revenue streams and determined that the adoption of ASC 606 will not change the current timing of revenue recognition for such transactions. Some revenue arrangements, such as energy-related derivatives and alternative revenue programs, are excluded from the scope of ASC 606 and, therefore, will be accounted for and disclosed or presented separately from revenues under ASC 606 on the Company's financial statements. The Company has concluded contributions in aid of construction are not in scope for ASC 606 and will continue to be accounted for as an offset to property, plant, and equipment.
The new standard is effective for reporting periods beginning after December 15, 2017. The Company applied the modified retrospective method of adoption effective January 1, 2018. The Company also utilized practical expedients which allowed it to apply the standard to open contracts at the date of adoption and to reflect the aggregate effect of all modifications when identifying performance obligations and allocating the transaction price for contracts modified before the effective date. Under the modified retrospective method of adoption, prior year reported results are not restated; however, a cumulative-effect adjustment to retained earnings at January 1, 2018 is recorded. In addition, quarterly disclosures will include comparative information on 2018 financial statement line items under current guidance. The adoption of ASC 606 did not result in a cumulative-effect adjustment.
Leases
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 requires lessees to recognize on the balance sheet a lease liability and a right-of-use asset for all leases. ASU 2016-02 also changes the recognition, measurement, and presentation of expense associated with leases and provides clarification regarding the identification of certain components of contracts that would represent a lease. The accounting required by lessors is relatively unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and the Company will adopt the new standard effective January 1, 2019.
The Company is currently implementing an information technology system along with the related changes to internal controls and accounting policies that will support the accounting for leases under ASU 2016-02. In addition, the Company has substantially completed a detailed inventory and analysis of its leases. In terms of rental charges and duration of contracts, the most significant leases relate to real estate and fleet vehicles where the Company is the lessee and to natural gas home appliances where the Company is the lessor. While the Company has not yet determined the ultimate impact, adoption of ASU 2016-02 is expected to have a significant impact on the Company's balance sheet.
Other
In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). ASU 2016-09 changes the accounting for income taxes and the cash flow presentation for share-based payment award transactions effective for fiscal years beginning after December 15, 2016. The new guidance requires all excess tax benefits and deficiencies related to the exercise or vesting of stock compensation to be recognized as income tax expense or benefit in the income statement. Previously, the Company recognized any excess tax benefits and deficiencies related to the exercise and vesting of stock compensation as additional paid-in capital. In addition, the new guidance requires excess tax benefits for share-based payments to be included in net cash provided from operating activities rather than net cash provided from financing activities on the statement of cash flows. The Company elected to adopt the guidance in 2016 and reflect the related adjustments as of January 1, 2016. Prior year's data presented in the financial statements has not been adjusted. The Company also elected to recognize forfeitures as they occur. The new guidance did not have a material impact on the results of operations, financial position, or cash flows of the Company. See Note 5 for the disclosure impacted by ASU 2016-09.
In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18). ASU 2016-18 eliminates the need to reflect transfers between cash and restricted cash in operating, investing, and financing activities in the statement of cash flows. Upon adoption, the net change in cash and cash equivalents during the period will include amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, and will be applied retrospectively to each period presented. The Company adopted ASU 2016-18 effective January 1, 2018 with no material impact on its financial statements.
On January 26, 2017, the FASB issued ASU No. 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (ASU 2017-04). ASU 2017-04 removes the requirement to compare the implied fair value of goodwill with the carrying amount as part of Step 2 of the goodwill impairment test. Under the new standard, the goodwill impairment loss will be measured as the excess of a reporting unit's carrying amount over its fair value, not exceeding the total amount of goodwill allocated to that reporting unit, which may increase the frequency of goodwill impairment charges if a future goodwill impairment test does not pass the Step 1 evaluation. ASU 2017-04 is effective prospectively for periods beginning on or after December 15, 2019, with early adoption permitted. The Company adopted ASU 2017-04 effective January 1, 2018 with no impact on its financial statements.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


On March 10, 2017, the FASB issued ASU No. 2017-07, Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). ASU 2017-07 requires that an employer report the service cost component in the same line item or items as other compensation costs and requires the other components of net periodic pension and postretirement benefit costs to be separately presented in the income statement outside of income from operations. Additionally, only the service cost component is eligible for capitalization, when applicable. However, all cost components remain eligible for capitalization under FERC regulations. ASU 2017-07 will be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension and postretirement benefit costs in the income statement. The capitalization of only the service cost component of net periodic pension and postretirement benefit costs in assets will be applied on a prospective basis. ASU 2017-07 is effective for periods beginning after December 15, 2017. The presentation changes required for net periodic pension and postretirement benefit costs will result in a decrease in the Company's operating income and an increase in other income for 2016 and 2017 and are expected to result in a decrease in operating income and an increase in other income for 2018. The Company adopted ASU 2017-07 effective January 1, 2018 with no material impact on its financial statements.
On August 28, 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12), amending the hedge accounting recognition and presentation requirements. ASU 2017-12 makes more financial and non-financial hedging strategies eligible for hedge accounting, amends the related presentation and disclosure requirements, and simplifies hedge effectiveness assessment requirements. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 effective January 1, 2018 with no material impact on its financial statements.
Affiliate Transactions
SCS, as agent for Alabama Power, Georgia Power, and Southern Power, and the Company have long-term interstate natural gas transportation agreements with SNG. The interstate transportation service provided to Alabama Power, Georgia Power, Southern Power, and the Company by SNG pursuant to these agreements is governed by the terms and conditions of SNG's natural gas tariff and is subject to FERC regulation. For the successor year ended December 31, 2017, transportation revenue under these agreements from SCS and the Company were $136 million and $32 million, respectively. For the successor period of September 1, 2016 through December 31, 2016, transportation revenue under these agreements from SCS and the Company were $32 million and $15 million, respectively. See Note 4 under "Equity Method Investments – SNG" for additional information regarding the Company's investment in SNG.
The Company has an agreement with SCS under which the following services are currently being rendered to the Company as direct or allocated cost: accounting, finance and treasury, tax, information technology, auditing, insurance and pension administration, human resources, systems and procedures, purchasing, and other services. For the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016, costs for these services amounted to $63 million and $17 million, respectively. Cost allocation methodologies have been reported to the FERC and management believes they are reasonable. The FERC permits services to be rendered at cost by system service companies.
SCS, as agent for Alabama Power, Georgia Power, and Southern Power, has agreements with certain subsidiaries of the Company to purchase natural gas. For the successor year ended December 31, 2017, natural gas purchases made by SCS from the Company's subsidiaries were $142 million. For the successor period of July 1, 2016 through December 31, 2016, natural gas purchases made by SCS from the Company's subsidiaries were $27 million.
Regulatory Assets and Liabilities
The Company is subject to accounting requirements for the effects of rate regulation. Regulatory assets represent probable future revenues associated with certain costs that are expected to be recovered from customers through the ratemaking process. Regulatory liabilities represent probable future reductions in revenues associated with amounts that are expected to be credited to customers through the ratemaking process.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Regulatory assets and (liabilities) reflected in the balance sheets at December 31 relate to:
 2017 2016 Note
 (in millions)  
Environmental remediation$410
 $411
 (a,b)
Retiree benefit plans270
 325
 (a,c)
Long-term debt fair value adjustment138
 154
 (d)
Under recovered regulatory clause revenues98
 118
 (e)
Other regulatory assets79
 58
 (f)
Other cost of removal obligations(1,646) (1,616) (g)
Deferred income tax credits(1,063) (22) (g,i)
Over recovered regulatory clause revenues(144) (104) (e)
Other regulatory liabilities(21) (39) (h)
Total regulatory assets (liabilities), net$(1,879) $(715)  
Note: The recovery and amortization periods for these regulatory assets and (liabilities) are as follows:
(a)Not earning a return as offset in rate base by a corresponding asset or liability.
(b)Recovered through environmental cost recovery mechanisms when the remediation is performed or the work is performed.
(c)Recovered and amortized over the average remaining service period which range up to 15 years. See Note 2 for additional information.
(d)Recovered over the remaining life of the original debt issuances, which range up to 21 years.
(e)Recorded and recovered or amortized as approved or accepted by the appropriate state regulatory agencies over periods generally not exceeding eight years.
(f)Comprised of several components including unamortized loss on reacquired debt, weather normalization, franchise gas, deferred depreciation expense, and financial instrument-hedging assets, which are recovered or amortized as approved by the applicable state regulatory agencies over periods generally not exceeding 10 years, except for financial hedging-instruments. Financial instrument-hedging assets are recorded over the life of the underlying hedged purchase contracts, which generally do not exceed two years. Upon final settlement, actual costs incurred are recovered, and actual income earned is refunded through the energy cost recovery clause.
(g)Other cost of removal obligations are recorded and deferred income tax liabilities are amortized over the related property lives, which may range up to 80 years. Cost of removal liabilities will be settled and trued up following completion of the related activities.
(h)Comprised of several components including energy efficiency programs, unamortized bond issuance costs and financial instrument-hedging liabilities which are recovered or amortized as approved by the applicable state regulatory agencies over periods generally not exceeding a range of four years to 20 years, except for financial hedging-instruments. Financial instrument-hedging liabilities are recorded over the life of the underlying hedged purchase contracts, which generally do not exceed two years. Upon final settlement, actual costs incurred are recovered, and actual income earned is refunded through the energy cost recovery clause.
(i)Includes excess deferred income tax liabilities not subject to normalization as a result of the Tax Reform Legislation, the recovery and amortization of which will be determined by the applicable state regulatory agencies. See Note 3 under "Regulatory Matters" and Note 5 for additional details.
In the event that a portion of a natural gas distribution utility's operations is no longer subject to applicable accounting rules for rate regulation, the Company would be required to write off to income related regulatory assets and liabilities that are not specifically recoverable through regulated rates. In addition, the natural gas distribution utility would be required to determine if any impairment to other assets, including plant, exists and write down the assets, if impaired, to their fair values. All regulatory assets and liabilities are to be reflected in rates. See Note 3 under "Regulatory Matters" for additional information.
Revenues
Gas Distribution Operations
The Company records revenues when goods or services are provided to customers. Those revenues are based on rates approved by the state regulatory agencies of the Company's utilities. As required by the Georgia PSC, Atlanta Gas Light bills Marketers in equal monthly installments for each residential, commercial, and industrial end-use customer's distribution costs as well as for capacity costs utilizing a seasonal rate design for the calculation of each residential end-use customer's annual straight-fixed-variable charge, which reflects the historic volumetric usage pattern for the entire residential class.
All of the natural gas distribution utilities, with the exception of Atlanta Gas Light, have rate structures that include volumetric rate designs that allow the opportunity to recover certain costs based on gas usage. Revenues from sales and transportation services are recognized in the same period in which the related volumes are delivered to customers. Revenues from residential and certain commercial and industrial customers are recognized on the basis of scheduled meter readings. Additionally, unbilled revenues are recognized for estimated deliveries of gas not yet billed to these customers, from the last bill date to the end of the accounting period. For other commercial and industrial customers and for all wholesale customers, revenues are based on actual deliveries to the end of the period.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


The tariffs for several of the natural gas distribution utilities include provisions which allow for the recognition of certain revenues prior to the time such revenues are billed to customers. These provisions are referred to as alternative revenue programs and provide for the recognition of certain revenues prior to billing, so long as the amounts recognized will be collected from customers within 24 months of recognition. These programs are as follows:
Weather normalization adjustments – reduce customer bills when winter weather is colder than normal and increase customer bills when weather is warmer than normal and are included in the tariffs for Virginia Natural Gas, Elizabethtown Gas, and Chattanooga Gas;
Revenue normalization mechanisms – mitigate the impact of conservation and declining customer usage and are contained in the tariffs for Virginia Natural Gas, Chattanooga Gas, and Elkton Gas; and
Revenue true-up adjustment – included within the provisions of the Georgia Rate Adjustment Mechanism (GRAM) program in which Atlanta Gas Light participates as a short-term alternative to formal rate case filings, the revenue true-up feature provides for a monthly positive (or negative) adjustment to record revenue in the amount of any variance to budgeted revenues, which are submitted and approved annually as a requirement of GRAM. Such adjustments are reflected in customer billings in a subsequent program year.
Revenue Taxes
The Company charges customers for gas revenue and gas use taxes imposed on the Company and remits amounts owed to various governmental authorities. Gas revenue taxes are recorded at the amount charged to customers, which may include a small administrative fee, as operating revenues, and the related taxes imposed on the Company are recorded as operating expenses on the statements of income. Gas use taxes are excluded from revenue and expense with the related administrative fee included in operating revenues when the tax is imposed on the customer. Revenue taxes included in operating expenses were $98 million and $31 million for the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016, respectively, and $56 million and $101 million for the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, respectively.
Gas Marketing Services
The Company recognizes revenues from natural gas sales and transportation services in the same period in which the related volumes are delivered to customers and recognizes sales revenues from residential and certain commercial and industrial customers on the basis of scheduled meter readings. The Company also recognizes unbilled revenues for estimated deliveries of gas not yet billed to these customers from the most recent meter reading date to the end of the accounting period. For other commercial and industrial customers and for all wholesale customers, revenues are based on actual deliveries during the period.
The Company recognizes revenues on 12-month utility-bill management contracts as the lesser of cumulative earned or cumulative billed amounts. Revenues for warranty and repair contracts are recognized on a straight-line basis over the contract term while revenues for maintenance services are recognized at the time such services are performed.
Wholesale Gas Services
The Company nets revenues from energy and risk management activities with the associated costs. Profits from sales between segments are eliminated and are recognized as goods or services sold to end-use customers. The Company records transactions that qualify as derivatives at fair value with changes in fair value recognized in earnings in the period of change and characterized as unrealized gains or losses. Gains and losses on derivatives held for energy trading purposes are presented on a net basis in revenue.
Concentration of Revenue
The Company has a diversified base of customers. No single customer or industry comprises 10% or more of revenues. For all periods presented, uncollectible accounts averaged less than 1% of revenues.
Cost of Natural Gas and Other Sales
Gas Distribution Operations
Excluding Atlanta Gas Light, which does not sell natural gas to end-use customers, the Company charges its utility customers for natural gas consumed using natural gas cost recovery mechanisms set by the applicable state regulatory agencies. Under these mechanisms, all prudently-incurred natural gas costs are passed through to customers without markup, subject to regulatory review. The Company defers or accrues the difference between the actual cost of natural gas and the amount of commodity
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


revenue earned in a given period such that no operating income is recognized related to these costs. The deferred or accrued amount is either billed or refunded to customers prospectively through adjustments to the commodity rate. Deferred and accrued natural gas costs are included in the balance sheets as regulatory assets and regulatory liabilities, respectively.
Gas Marketing Services
The Company's gas marketing services' customers are charged for actual or estimated natural gas consumed. Within cost of natural gas, the Company also includes costs of fuel and lost and unaccounted for gas, adjustments to reduce the value of inventories to market value, and gains and losses associated with certain derivatives. The Company records the costs to service its warranty and repair contract claims as cost of other sales.
Income and Other Taxes
The Company uses the liability method of accounting for deferred income taxes and provides deferred income taxes for all significant income tax temporary differences. Federal ITCs utilized are deferred and amortized to income over the average life of the related property. Taxes that are collected from customers on behalf of governmental agencies to be remitted to these agencies are presented on the balance sheet, excluding revenue taxes which are presented on the statements of income. See "Revenues – Gas Distribution Operations – Revenue Taxes" herein for additional information.
The Company recognizes tax positions that are "more likely than not" of being sustained upon examination by the appropriate taxing authorities. See Note 5 under "Unrecognized Tax Benefits" for additional information.
Property, Plant, and Equipment
Property, plant, and equipment is stated at original cost, or fair value at the effective date of the Merger as appropriate, less any regulatory disallowances and impairments. Original cost includes: materials; labor; minor items of property; appropriate administrative and general costs; payroll-related costs such as taxes, pensions, and other benefits; and the interest capitalized and cost of equity funds used during construction.
The Company's property, plant, and equipment in service consisted of the following at December 31:
 2017  2016
 (in millions)
Utility plant in service$13,079
  $11,996
Information technology equipment and software366
  324
Storage facilities1,599
  1,463
Other789
  725
Total other plant in service2,754
  2,512
Total plant in service$15,833
  $14,508
The cost of replacements of property, exclusive of minor items of property, is capitalized. The cost of maintenance, repairs, and replacement of minor items of property is charged to other operations and maintenance expenses as incurred or performed. The portion of non-working gas used to maintain the structural integrity of the Company's natural gas storage facilities that is considered to be non-recoverable is recorded as depreciable property, plant, and equipment, while the recoverable or retained portion is recorded as non-depreciable property, plant, and equipment.
The amount of non-cash property additions recognized for the successor periods of the year ended December 31, 2017 and July 1, 2016 through December 31, 2016 and the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015 were $135 million, $63 million, $41 million, and $48 million, respectively. These amounts are comprised of construction-related accounts payable outstanding at the end of each period.
Depreciation and Amortization
Depreciation of the original cost of utility plant in service is provided using composite straight-line rates, which approximated 2.9% in 2017, 2.8% in 2016, and 2.7% in 2015. Depreciation studies are conducted periodically to update the composite rates that are approved by the respective state regulatory agency. When property subject to composite depreciation is retired or otherwise disposed of in the normal course of business, its original cost, together with the cost of removal, less salvage, is charged to accumulated depreciation. For other property dispositions, the applicable cost and accumulated depreciation are removed from the balance sheet accounts, and a gain or loss is recognized. Minor items of property included in the original cost of the asset are retired when the related property unit is retired.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Depreciation of the original cost of other plant in service is provided primarily on a straight-line basis over the following useful lives: five to 15 years for transportation equipment, 40 to 60 years for storage facilities, and up to 65 years for other assets.
Allowance for Funds Used During Construction
The Company records AFUDC for Atlanta Gas Light, Nicor Gas, Chattanooga Gas, and Elizabethtown Gas, which represents the estimated debt and equity costs of capital funds that are necessary to finance the construction of new regulated facilities. While cash is not realized currently, AFUDC increases the revenue requirement and is recovered over the service life of the asset through a higher rate base and higher depreciation. All current construction costs are included in rates. The capital expenditures of the other three natural gas utilities do not qualify for AFUDC treatment.
The Company's AFUDC composite rates are as follows:
 Successor  Predecessor
 Year ended December 31, 2017  July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 Year ended December 31, 2015
Atlanta Gas Light 
8.10%  4.05%  4.05% 8.10%
Chattanooga Gas7.41
  3.71
  3.71
 7.41
Elizabethtown Gas(*)
1.56
  0.84
  0.84
 1.69
Nicor Gas(*)
1.22
  1.50
  1.50
 0.82
(*)Variable rate is determined by the FERC method of AFUDC accounting.
Cash payments for interest during the successor periods of the year ended December 31, 2017 and July 1, 2016 through December 31, 2016 and the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015 totaled $223 million, $135 million, $119 million, and $181 million, respectively.
Impairment of Long-Lived Assets
The Company evaluates long-lived assets for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The determination of whether an impairment has occurred is based on either a specific regulatory disallowance or an estimate of undiscounted future cash flows attributable to the assets, as compared with the carrying value of the assets. If an impairment has occurred, the amount of the impairment recognized is determined by either the amount of regulatory disallowance or by estimating the fair value of the assets and recording a loss if the carrying value is greater than the fair value. For assets identified as held for sale, the carrying value is compared to the estimated fair value less the cost to sell in order to determine if an impairment loss is required. Until the assets are disposed of, their estimated fair value is re-evaluated when circumstances or events change. See Note 3 under "Other Matters" for additional information.
Goodwill and Other Intangible Assets and Liabilities
Goodwill is not amortized, but is subject to an annual impairment test during the fourth quarter of each year, or more frequently if impairment indicators arise. In assessing goodwill for impairment, the Company has the option of first performing a qualitative assessment to determine that it is more likely than not that fair value of its reporting unit exceeds its carrying value (commonly referred to as Step 0). If the Company chooses not to perform a qualitative assessment, or the result of Step 0 indicates a probable decrease in fair value of its reporting unit below its carrying value, a quantitative two-step test is performed (commonly referred to as Step 1 and Step 2). Step 1 compares the fair value of the reporting unit to its carrying value including goodwill. If the carrying value exceeds the fair value, Step 2 is performed to allocate the fair value of the reporting unit to its assets and liabilities in order to determine the implied fair value of goodwill, which is compared to the carrying value of goodwill to calculate an impairment loss, if any.
For the 2017 annual impairment test, the Company performed Step 1 of the two-step impairment test, which resulted in the fair value of all its reporting units that have goodwill exceeding their carrying value. For the 2016 and 2015 annual impairment tests, the Company performed the qualitative Step 0 assessment and determined that it was more likely than not that the fair value of all its reporting units with goodwill exceeded their carrying values, and therefore no quantitative assessment was required. In the third quarter 2015, the Company identified potential impairment indicators and performed an interim impairment test for its storage and fuels reporting unit, which resulted in impairment of the full $14 million goodwill balance for that reporting unit.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Goodwill and other intangible assets consisted of the following:
   At December 31, 2017
 Estimated Useful Life Gross Carrying Amount Accumulated Amortization Other Intangible Assets, Net
   (in millions)
Other intangible assets subject to amortization:       
Gas marketing services       
   Customer relationships11-16 years $221
 $(77) $144
   Trade names10-28 years 115
 (9) 106
Wholesale gas services       
   Storage and transportation contracts1-5 years 64
 (34) 30
Total intangible assets subject to amortization  $400
 $(120) $280
        
Goodwill:       
Gas distribution operations  $4,702
 $
 $4,702
Gas marketing services  1,265
 
 1,265
Total goodwill  $5,967
 $
 $5,967
   At December 31, 2016
 Estimated Useful Life Gross Carrying Amount Accumulated Amortization Other Intangible Assets, Net
   (in millions)
Other intangible assets subject to amortization:       
Gas marketing services       
   Customer relationships11-16 years $221
 $(30) $191
   Trade names10-28 years 115
 (2) 113
Wholesale gas services       
   Storage and transportation contracts1-5 years 64
 (2) 62
Total intangible assets subject to amortization  $400
 $(34) $366
        
Goodwill:       
Gas distribution operations  $4,702
 $
 $4,702
Gas marketing services  1,265
 
 1,265
Total goodwill  $5,967
 $
 $5,967
Amortization associated with intangible assets for gas marketing services, included in depreciation and amortization, for the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016 and the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015 was $54 million, $32 million, $8 million, and $18 million, respectively. Amortization of $32 million and $2 million for wholesale gas services was recorded as a reduction to operating revenues for the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016, respectively.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


As of December 31, 2017, the estimated amortization associated with other intangible assets is as follows:
 Amortization
 (in millions)
2018$58
201940
202028
202121
202217
Included in other deferred credits and liabilities on the balance sheets is $91 million of intangible liabilities that were recorded during acquisition accounting for transportation contracts at wholesale gas services. At December 31, 2017, the accumulated amortization of these intangible liabilities was $50 million. The estimated amortization associated with the intangible liabilities that will be recorded in natural gas revenues is as follows:
 Amortization
 (in millions)
2018$24
201917
Cash and Cash Equivalents
For purposes of the financial statements, temporary cash investments are considered cash equivalents. Temporary cash investments are securities with original maturities of 90 days or less.
Energy Marketing Receivables and Payables
Wholesale gas services provides services to retail gas marketers, wholesale gas marketers, utility companies, and industrial customers. These counterparties utilize netting agreements that enable wholesale gas services to net receivables and payables by counterparty upon settlement. Wholesale gas services also nets across product lines and against cash collateral, provided the master netting and cash collateral agreements include such provisions. While the amounts due from, or owed to, wholesale gas services' counterparties are settled net, they are recorded on a gross basis in the balance sheets as energy marketing receivables and energy marketing payables.
Wholesale gas services has trade and credit contracts that contain minimum credit rating requirements. These credit rating requirements typically give counterparties the right to suspend or terminate credit if the Company's credit ratings are downgraded to non-investment grade status. Under such circumstances, wholesale gas services would need to post collateral to continue transacting business with some of its counterparties. As of December 31, 2017 and 2016, the required collateral in the event of a credit rating downgrade was $8 million and immaterial, respectively.
Wholesale gas services has a concentration of credit risk for services it provides to its counterparties. This credit risk is generally concentrated in 20 of its counterparties and is measured by 30-day receivable exposure plus forward exposure. Counterparty credit risk is evaluated using an S&P equivalent credit rating, which is determined by a process of converting the lower of the S&P or Moody's rating to an internal rating ranging from 9 to 1, with 9 being equivalent to AAA/Aaa by S&P and Moody's, respectively, and 1 being equivalent to D/Default by S&P and Moody's, respectively. A counterparty that does not have an external rating is assigned an internal rating based on the strength of its financial ratios. As of December 31, 2017, the top 20 counterparties represented 48%, or $203 million, of the total counterparty exposure and had a weighted average S&P equivalent rating of A-.
Credit policies were established to determine and monitor the creditworthiness of counterparties, including requirements to post collateral or other credit security, as well as the quality of pledged collateral. Collateral or credit security is most often in the form of cash or letters of credit from an investment-grade financial institution, but may also include cash or U.S. government securities held by a trustee. When wholesale gas services is engaged in more than one outstanding derivativePrior to entering a physical transaction, withSouthern Company Gas assigns its counterparties an internal credit rating and credit limit based on the same counterpartycounterparties' Moody's, S&P, and it also has a legally enforceable netting agreement with that counterparty, the "net" mark-to-market exposure represents the netting of the positiveFitch ratings, commercially available credit reports, and negative exposures with that counterparty combined with a reasonable measure of the Company's credit risk. Wholesale gas services also uses other netting agreements with certainaudited financial statements. Southern Company Gas may require counterparties with whom it conducts significant transactions.
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NOTES (continued)pledge additional collateral when deemed necessary.
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Receivables and Provision for Uncollectible Accounts
The Company's other trade receivables consist primarily of natural gas sales and transportation services billedutilizes netting agreements whenever possible to residential, commercial, industrial, and other customers. Customers are billed monthly and payment is due within 30 days. For the majority of receivables, a provision for uncollectible accounts is established based on historical collection experience and other factors. For the remaining receivables, if the Company is aware of a specific customer's inability to pay, a provision for uncollectible accounts is recorded to reduce the receivable balance to the amount the Company reasonably expects to collect. If circumstances change, the estimate of the recoverability of accounts receivable could change as well. Circumstances that could affect this estimate include, but are not limited to, customer credit issues, customer deposits, and general economic conditions. Customers' accounts are written off once they are deemed to be uncollectible.
Nicor Gas
Credit risk exposure at Nicor Gas is mitigated by a bad debt rider approved by the Illinois Commission. The bad debt rider provides for the recovery from (or refund to) customers of the difference between Nicor Gas' actual bad debt experience on an annual basis and the benchmark bad debt expense used to establish its base rates for the respective year.
Atlanta Gas Light
Concentration of credit risk occurs at Atlanta Gas Light for amounts billed for services and other costs to its customers, which consist of 15 Marketers in Georgia. The credit risk exposure to Marketers varies seasonally, with the lowest exposure in the non-peak summer months and the highest exposure in the peak winter months. Marketers are responsible for the retail sale of natural gas to end-use customers in Georgia. The functions of the retail sale of gas include the purchase and sale of natural gas, customer service, billings, and collections. The provisions of Atlanta Gas Light's tariff allow Atlanta Gas Light to obtain credit security support in an amount equal to a minimum of two times a Marketer's highest month's estimated bill from Atlanta Gas Light.
Materials and Supplies
Generally, materials and supplies include propane gas inventory, fleet fuel, and other materials and supplies. Materials are charged to inventory when purchased and then expensed or capitalized to plant, as appropriate, at weighted average cost when installed.
Natural Gas for Sale
The natural gas distribution utilities, with the exception of Nicor Gas, record natural gas inventories on a WACOG basis. In Georgia's competitive environment, Marketers sell natural gas to firm end-use customers at market-based prices. Part of the unbundling process, which resulted from deregulation and provides this competitive environment, is the assignment to Marketers of certain pipeline services that Atlanta Gas Light has under contract. On a monthly basis, Atlanta Gas Light assigns to Marketers the majority of the pipeline storage services that it has under contract, along with a corresponding amount of inventory. Atlanta Gas Light retains and manages a portion of its pipeline storage assets and related natural gas inventories for system balancing and to serve system demand.
Nicor Gas' inventory is carried at cost on a LIFO basis. Inventory decrements occurring during the year that are restored prior to year end are charged to cost of natural gas at the estimated annual replacement cost. Inventory decrements that are not restored prior to year end are charged to cost of natural gas at the actual LIFO cost of the inventory layers liquidated. The cost of gas, including inventory costs, is recovered from customers under a purchased gas recovery mechanism adjusted for differences between actual costs and amounts billed; therefore, LIFO liquidations have no impact on the Company's net income. At December 31, 2017, the Nicor Gas LIFO inventory balance was $148 million. Based on the average cost of gas purchased in December 2017, the estimated replacement cost of Nicor Gas' inventory at December 31, 2017 was $264 million. During 2017, Nicor Gas did not liquidate any LIFO-based inventory.
The gas marketing services, wholesale gas services, and all other segments record inventory at LOCOM, with cost determined on a WACOG basis. For these segments, the Company evaluates the weighted average cost of its natural gas inventories against market prices to determine whether any declines in market prices below the WACOG are other than temporary. For any declines considered to be other than temporary, the Company recorded the following LOCOM adjustments to cost of natural gas to reduce the value of its natural gas inventories to market value.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


 Successor  Predecessor
 2017 July 1, 2016 to December 31, 2016  January 1, 2016 to June 30, 2016 2015
 (in millions)  (in millions)
Gas marketing services$
 $
  $
 $3
Wholesale gas services2
 1
  3
 19
All other
 
  
 1
Total LOCOM adjustments$2
 $1
  $3
 $23
Fair Value Measurements
The Company has financial and nonfinancial assets and liabilities subject to fair value measurement. The financial assets and liabilities measured and carried at fair value include cash and cash equivalents and derivative instruments. The carrying values of receivables, short and long-term investments, accounts payable, short-term debt, other current assets and liabilities, and accrued interest approximate their respective fair value. The nonfinancial assets and liabilities include pension and other postretirement benefits. See Notes 2 and 9 for additional fair value disclosures.
Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The Company utilizes market data or assumptions that market participants would use in valuing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, market corroborated, or generally unobservable. The Company primarily applies the market approach for recurring fair value measurements to utilize the best available information. Accordingly, the Company uses valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. Fair value balances are classified based on the observance of those inputs. The guidance establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy defined by the guidance are as follows:
Level 1
Quoted prices in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. The Company's Level 1 items consist of exchange-traded derivatives, money market funds, and certain retirement plan assets.
Level 2
Pricing inputs are other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reporting date. Level 2 includes those financial and commodity instruments that are valued using valuation methodologies. These methodologies are primarily industry-standard methodologies that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace. Market price data is obtained from multiple sources in order to value certain Level 2 transactions and this data is representative of transactions that occurred in the marketplace. Level 2 instruments include shorter tenor exchange-traded and non-exchange-traded derivatives such as over-the-counter (OTC) forwards and options and certain retirement plan assets.
Level 3
Pricing inputs include significant unobservable inputs that may be used with internally developed methodologies to determine management's best estimate of fair value from the perspective of market participants. Level 3 instruments include those that may be more structured or otherwise tailored to customers' needs. Level 3 assets, liabilities, and any applicable transfers are primarily related to the Company's pension and other postretirement benefit plan assets as described in Note 2. Transfers into and out of Level 3 are determined using values at the end of the interim period in which the transfer occurred.
Financial Instruments
The Company uses derivative financial instruments to limit exposure to fluctuations in natural gas prices, weather, interest rates, and commodity prices. All derivative financial instruments are recognized as either assets or liabilities on the balance sheets (shown separately as "Risk Management Activities") and are measured at fair value. See Note 9 for additional information
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


regarding fair value. Derivative contracts that qualify as cash flow hedges of anticipated transactions or are recoverable through the respective state regulatory agency approved fuel-hedging programs result in the deferral of related gains and losses in OCI or regulatory assets and liabilities, respectively, until the hedged transactions occur. Any ineffectiveness arising from cash flow hedges is recognized currently in net income. Cash flows from derivatives are classified on the statement of cash flows in the same category as the hedged item. See Note 10 for additional information regarding derivatives.
The Company offsets fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a master netting arrangement. The Company had no outstanding collateral repayment obligations or rights to reclaim collateral arising from derivative instruments recognized at December 31, 2017.
The Company enters into weather derivative contracts as economic hedges of natural gas revenues in the event of warmer-than-normal weather in the Heating Season. Exchange-traded options are carried at fair value, with changes reflected in natural gas revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are also reflected in natural gas revenues in the statements of income.
Wholesale gas services purchases natural gas for storage when the current market price paid to buy and transport natural gas plus the cost to store and finance the natural gas is less than the market price that can be received in the future, resulting in positive net natural gas revenues. NYMEX futures and OTC contracts are used to sell natural gas at that future price to substantially protect the natural gas revenues that will ultimately be realized when the stored natural gas is sold. The Company enters into transactions to secure transportation capacity between delivery points in order to serve its customers and various markets. NYMEX futures and OTC contracts are used to capture the price differential or spread between the locations served by the capacity in order to substantially protect the natural gas revenues that will ultimately be realized when the physical flow of natural gas between delivery points occurs. These contracts generally meet the definition of derivatives and are carried at fair value on the balance sheets, with changes in fair value recorded in natural gas revenues on the statements of income in the period of change. These contracts are not designated as hedges for accounting purposes.
The purchase, transportation, storage, and sale of natural gas are accounted for on a weighted average cost or accrual basis, as appropriate, rather than on the fair value basis utilized for the derivatives used to mitigate the natural gas price risk associated with the storage and transportation portfolio. Monthly demand charges are incurred for the contracted storage and transportation capacity and payments associated with asset management agreements, and these demand charges and payments are recognized on the statements of income in the period they are incurred. This difference in accounting methods can result in volatility in reported earnings, even though the economic margin is substantially unchanged from the dates the transactions were consummated.
The Company is exposed to potential losses related to financial instruments in the event of counterparties' nonperformance. The Company has established controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company's exposure to counterparty credit risk.
Comprehensive Income
The objective of comprehensive income is to report a measure of all changes in common stock equity of an enterprise that result from transactions and other economic events of the period other than transactions with owners. Comprehensive income consists of net income, changes in the fair value of qualifying cash flow hedges, certain changes in pension and other postretirement benefit plans, and reclassifications for amounts included in net income.
Non-Wholly Owned Entities
The Company holds ownership interests in a number of business ventures with varying ownership structures and evaluates all of its partnership interests and other variable interests to determine if each entity is a VIE. If a venture is a VIE for which the Company is the primary beneficiary, the assets, liabilities, and results of operations of the entity are consolidated. The Company reassesses its conclusion as to whether an entity is a VIE upon certain occurrences, which are deemed reconsideration events under the guidance. See Note 4 under "Variable Interest Entities" for additional information.
For entities that are not determined to be VIEs, the Company evaluates whether it has control or significant influence over the investee to determine the appropriate consolidation and presentation. Generally, entities under the control of the Company are consolidated, and entities over which the Company can exert significant influence, but does not control, are accounted for under the equity method of accounting. However, the Company also invests in partnerships and limited liability companies that maintain separate ownership accounts. All such investments are required to be accounted for under the equity method unless the interest is so minor that there is virtually no influence over operating and financial policies, as are all investments in joint ventures.
Investments accounted for under the equity method are recorded within equity investments in unconsolidated subsidiaries within the other property and investments section in the balance sheets and the equity income is recorded within earnings from equity
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NOTES (continued)
Netting agreements enable Southern Company Gas and Subsidiary Companies 2017 Annual Report


method investments within the other income (expense) section in the statements of income. See Note 4 under "Equity Method Investments" for additional information.
2. RETIREMENT BENEFITS
The Company has a qualified defined benefit, trusteed, pension plan covering most eligible employees, which was closed in 2012 to new employees and reopened to all non-union employees on January 1, 2018. The qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No contributions to the qualified pension plan were made for the year ended December 31, 2017 and no mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2018. The Company also providesnet certain non-qualified defined benefit and defined contribution pension plans for a selected group of management and highly compensated employees. Benefits under these non-qualified pension plans are funded on a cash basis. In addition, the Company provides certain medical care and life insurance benefits for eligible retired employees through a postretirement benefit plan. The Company also has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. For the year ending December 31, 2018, no other postretirement trust contributions are expected.
In connection with the Merger, the Company performed updated valuations of its pension and other postretirement benefit plan assets and obligations to reflect actual census data at the new measurement date of July 1, 2016. This valuation resulted in increases to the projected benefit obligations for the pension and other postretirement benefit plans of approximately $177 million and $20 million, respectively, a decrease in the fair value of pension plan assets of $10 million, and an increase in the fair value of other postretirement benefit plan assets of $1 million. The Company also recorded a related regulatory asset of $437 million related to unrecognized prior service cost and actuarial gain/loss, as it is probable that this amount will be recovered through future rates for the natural gas distribution utilities. The previously unrecognized prior service cost and actuarial gain/loss related to non-utility subsidiaries were eliminated through purchase accounting adjustments.
Actuarial Assumptions
The weighted average rates assumed in the actuarial calculations used to determine both the net periodic costs for the pension and other postretirement benefit plans for all periods presented and the benefit obligations as of the measurement date are presented below.
 Successor  Predecessor
Assumptions used to determine net periodic costs:Year ended December 31, 2017July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016Year ended December 31, 2015
Pension plans      
Discount rate – interest costs(a)
3.76%3.21%  4.00%4.20%
Discount rate – service costs(a)
4.64
4.07
  4.80
4.20
Expected long-term return on plan assets7.60
7.75
  7.80
7.80
Annual salary increase3.50
3.50
  3.70
3.70
Pension band increase(b)
N/A
2.00
  2.00
2.00
Other postretirement benefit plans 
 
    
Discount rate – interest costs(a)
3.40%2.84%  3.60%4.00%
Discount rate – service costs(a)
4.55
3.96
  4.70
4.00
Expected long-term return on plan assets6.03
5.93
  6.60
7.80
Annual salary increase3.50
3.50
  3.70
3.70
(a)Effective January 1, 2016, the Company uses a spot rate approach to estimate the service cost and interest cost components. Previously, the Company estimated these components using a single weighted average discount rate.
(b)Only applicable to Nicor Gas union employees. The pension bands for the former Nicor plan reflect the negotiated rates in accordance with the union agreements.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Assumptions used to determine benefit obligations:2017 2016
Pension plans   
Discount rate3.74% 4.39%
Annual salary increase2.88
 3.50
Pension band increase(*)
N/A
 2.00
Other postretirement benefit plans 
  
Discount rate3.62% 4.15%
Annual salary increase2.56
 3.50
(*)Only applicable to Nicor Gas union employees. The pension bands for the former Nicor plan reflect the negotiated rates in accordance with the union agreements.
The Company estimates the expected return on pension plan and other postretirement benefit plan assets by evaluating expected bond returns, equity risk premiums, asset allocations, the effects of active plan management, the impact of periodic plan asset rebalancing, and historical performance. The Company also considers guidance from its investment advisors in making a final determination of its expected rate of return on assets. To the extent the actual rate of return on assets realized over the course of a year is greater or less than the assumed rate, it does not affect that year's annual pension or other postretirement benefit plan cost; rather, this gain or loss reduces or increases future pension or other postretirement benefit plan costs.
An additional assumption used in measuring the accumulated other postretirement benefit obligations (APBO) was a weighted average medical care cost trend rate. The weighted average medical care cost trend rates used in measuring the APBO as of December 31, 2017 were as follows:
 Initial Cost Trend Rate Ultimate Cost Trend Rate Year That Ultimate Rate is Reached
Pre-656.40% 4.50% 2038
Post-65 medical7.80
 4.50
 2038
Post-65 prescription7.80
 4.50
 2038
An annual increase or decrease in the assumed medical care cost trend rate of 1% would affect the APBO and the service and interest cost components at December 31, 2017 as follows:
 1 Percent Increase 1 Percent Decrease
 (in millions)
Benefit obligation$11
 $(10)
Service and interest costs
 
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Pension Plans
The total accumulated benefit obligation for the pension plans was $1.1 billion at December 31, 2017 and $1.1 billion at December 31, 2016. Changes in the projected benefit obligations and the fair value of plan assets for all periods presented were as follows:
 Successor  Predecessor
 Year ended December 31, 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016
 (in millions)  (in millions)
Change in benefit obligation      
Benefit obligation at beginning of period$1,133
 $1,244
` $1,067
Service cost23
 15
  13
Interest cost42
 20
  21
Plan amendments(26) 
  
Benefits paid(91) (31)  (26)
Actuarial (gain) loss103
 (115)  169
Balance at end of period1,184
 1,133
  1,244
Change in plan assets      
Fair value of plan assets at beginning of period983
 837
` 847
Actual return (loss) on plan assets175
 48
  15
Employer contributions1
 129
  1
Benefits paid(91) (31)  (26)
Fair value of plan assets at end of period1,068
 983
  837
Accrued liability$116
 $150
  $407
At December 31, 2017, the projected benefit obligations for the qualified and non-qualified pension plans were $1.1 billion and $44 million, respectively. All pension plan assets are related to the qualified pension plan.
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's pension plans consist of the following:
 2017 2016
 (in millions)
Other regulatory assets, deferred$217
 $267
Other deferred charges and assets85
 58
Other current liabilities(3) (2)
Employee benefit obligations(198) (206)
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Presented below are the amounts included in accumulated OCI and regulatory assets at December 31, 2017 and 2016 related to the defined benefit pension plans that had not yet been recognized in net periodic pension cost along with the estimated amortization of such amounts for 2018.
 Regulatory Amortization Prior Service Cost Net (Gain) Loss
 
(in millions)

Balance at December 31, 2017:     
Accumulated OCI$
 $
 $(42)
Regulatory assets (liabilities)40
 (20) 197
Total$40
 $(20) $155
Balance at December 31, 2016:     
Accumulated OCI$
 $
 $(43)
Regulatory assets (liabilities)
 (2) 269
Total$
 $(2) $226
Estimated amortization in net periodic cost in 2018:     
Regulatory assets (liabilities)$3
 $(2) $16
The components of OCI and the changes in the balance of regulatory assets related to the defined benefit pension plans for all periods presented were as follows:
 Accumulated OCI Regulatory Assets
 (in millions)
Predecessor – Balance at December 31, 2015:$282
 $88
Reclassification adjustments:   
Amortization of prior service costs1
 
Amortization of net loss(9) (4)
Total reclassification adjustments(8) (4)
Total change(8) (4)
Predecessor – Balance at June 30, 2016:$274
 $84
    
    
Successor – Balance at July 1, 2016:$
 $368
Net (gain) loss(43) (87)
Reclassification adjustments:   
Amortization of prior service costs
 1
Amortization of net loss
 (15)
Total reclassification adjustments
 (14)
Total change(43) (101)
Successor – Balance at December 31, 2016:$(43) $267
Net (gain) loss1
 (31)
Reclassification adjustments:   
Amortization of regulatory assets
 (1)
Amortization of net loss
 (18)
Total reclassification adjustments
 (19)
Total change1
 (50)
Successor – Balance at December 31, 2017:$(42) $217
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Components of net periodic pension costs for all periods presented were as follows:
 Successor  Predecessor
 Year ended December 31, 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 Year ended December 31, 2015
 (in millions)  (in millions)
Service cost$23
 $15
  $13
 $28
Interest cost42
 20
  21
 45
Expected return on plan assets(70) (35)  (33) (65)
Amortization of regulatory assets1
 
  
 
Amortization:        
Prior service costs
 (1)  (1) (2)
Net (gain)/loss18
 14
  13
 31
Net periodic pension cost$14
 $13
  $13
 $37
Net periodic pension cost is the sum of service cost, interest cost, and other costs netted against the expected return on plan assets. The expected return on plan assets is determined by multiplying the expected rate of return on plan assets and the market-related value of plan assets.
Future benefit payments reflect expected future service and are estimated based on assumptions used to measure the projected benefit obligation for the pension plans. At December 31, 2017, estimated benefit payments were as follows:
 Benefit Payments
 (in millions)
2018$100
201977
202079
202179
202280
2023 to 2027392
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Southern Company Gas and Subsidiary Companies 2017 Annual Report


Other Postretirement Benefits
Changes in the APBO and the fair value of plan assets for all periods presented were as follows:
 Successor  Predecessor
 Year ended December 31, 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016
 (in millions)  (in millions)
Change in benefit obligation      
Benefit obligation at beginning of period$308
 $338
  $318
Service cost2
 1
  1
Interest cost10
 5
  5
Benefits paid(19) (11)  (11)
Actuarial (gain) loss3
 (26)  24
Plan amendments3
 
  
Employee contributions3
 1
  1
Balance at end of period310
 308
  338
Change in plan assets      
Fair value of plan assets at beginning of period105
 100
  99
Actual return (loss) on plan assets20
 4
  1
Employee contributions3
 1
  1
Employer contributions17
 11
  10
Benefits paid(20) (11)  (11)
Fair value of plan assets at end of year125
 105
  100
Accrued liability$185
 $203
  $238
Amounts recognized in the balance sheets at December 31, 2017 and 2016 related to the Company's other postretirement benefit plans consist of the following:
  2017 2016
  (in millions)
Other regulatory assets, deferred $46
 $52
Employee benefit obligations (185) (203)
Presented below are the amounts included in accumulated OCI and regulatory assets at December 31, 2017 and 2016 related to the other postretirement benefit plans that had not yet been recognized in net periodic other postretirement benefit cost. The estimated amortization of such amounts for 2018 is immaterial.
 Regulatory Amortization Prior Service Cost Net (Gain) Loss
 (in millions)
Balance at December 31, 2017:     
Accumulated OCI$
 $
 $(3)
Regulatory assets (liabilities)6
 (7) 47
Total$6
 $(7) $44
Balance at December 31, 2016:     
Accumulated OCI$
 $
 $(3)
Regulatory assets (liabilities)
 (12) 64
Total$
 $(12) $61
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


The components of OCI, along with the changes in the balance of regulatory assets (liabilities), related to the other postretirement benefit plans for all periods presented were as follows:
 Accumulated OCI Regulatory Assets
 (in millions)
Predecessor – Balance at December 31, 2015:$36
 $30
Net (gain) loss
 
Reclassification adjustments:   
Amortization of prior service costs
 1
Amortization of net loss(1) (1)
Total reclassification adjustments(1) 
Total change(1) 
Predecessor – Balance at June 30, 2016:$35
 $30
    
    
Successor – Balance at July 1, 2016:$
 $77
Net (gain) loss(3) (23)
Reclassification adjustments:   
Amortization of prior service costs
 1
Amortization of net loss
 (3)
Total reclassification adjustments
 (2)
Total change(3) (25)
Successor – Balance at December 31, 2016:$(3) $52
Net (gain) loss
 (5)
Reclassification adjustments:   
Amortization of prior service costs
 3
Amortization of net loss
 (4)
Total reclassification adjustments
 (1)
Total change
 (6)
Successor – Balance at December 31, 2017:$(3) $46
Components of the other postretirement benefit plans' net periodic cost for all periods presented were as follows:
 Successor  Predecessor
 Year ended December 31, 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 Year ended December 31, 2015
 (in millions)  (in millions)
Service cost$2
 $1
  $1
 $2
Interest cost10
 5
  5
 13
Expected return on plan assets(7) (3)  (3) (7)
Amortization of regulatory assets
 2
  
 
Amortization:        
Prior service costs(3) 
  (1) (3)
Net (gain)/loss4
 
  2
 6
Net periodic postretirement benefit cost$6
 $5
  $4
 $11
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Future benefit payments, including prescription drug benefits, reflect expected future service and are estimated based on assumptions used to measure the APBO for the other postretirement benefit plans. At December 31, 2017, estimated benefit payments were as follows:
 Benefit Payments
 (in millions)
2018$20
201920
202021
202121
202222
2023 to 2027105
Benefit Plan Assets
Pension plan and other postretirement benefit plan assets are managed and invested in accordance with all applicable requirements, including ERISA and the Internal Revenue Code of 1986, as amended. The Company's investment policies for both the pension plan and the other postretirement benefit plans cover a diversified mix of assets, including equity and fixed income securities, real estate, and private equity. The Company minimizes the risk of large losses primarily through diversification but also monitors and manages other aspects of risk.
The composition of the Company's pension plan and other postretirement benefit plan assets as of December 31, 2017 and 2016, along with the targets for each plan, is presented below:
  Target 2017 2016
Pension plan assets:      
Equity 53% 65% 69%
Fixed Income 15
 19
 20
Cash 2
 6
 1
Other 30
 10
 10
Balance at end of period 100% 100% 100%
Other postretirement benefit plan assets:      
Equity 72% 76% 74%
Fixed Income 24
 20
 23
Cash 1
 2
 1
Other 3
 2
 2
Total 100% 100% 100%
The investment strategy for plan assets related to the Company's qualified pension plan is to be broadly diversified across major asset classes. The asset allocation is established after consideration of various factors that affect the assets and liabilities ofby counterparty across product lines and against cash collateral, provided the pension plan including, but not limitednetting and cash collateral agreements include such provisions. While the amounts due from, or owed to, historical and expected returns and interest rates, volatility, correlations of asset classes, the current level of assets and liabilities, and the assumed growth in assets and liabilities. Because a significant portion of the liability of the pension plan is long-term in nature, the assetscounterparties are invested consistent with long-term investment expectations for return and risk. To manage the actual asset class exposures relative to the target asset allocation, the Company employs a formal rebalancing program for its pension plan assets. As additional risk management, external investment managers and service providerssettled net, they are subject to written guidelines to ensure appropriate and prudent investment practices. Management believes the portfolio is well-diversified with no significant concentrations of risk.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Investment Strategies
Detailed below is a description of the investment strategies for the successor period for each major asset category for the pension and other postretirement benefit plans disclosed above:
Domestic equity. A mix of large and small capitalization stocks with generally an equal distribution of value and growth attributes, managed both actively and through passive index approaches.
International equity. A mix of growth stocks and value stocks with both developed and emerging market exposure, managed both actively and through passive index approaches.
Fixed income. A mix of domestic and international bonds.
Special situations. Investments in opportunistic strategies with the objective of diversifying and enhancing returns and exploiting short-term inefficiencies as well as investments in promising new strategies of a longer-term nature.
Real estate investments. Investments in traditional private market, equity-oriented investments in real properties (indirectly through pooled funds or partnerships) and in publicly traded real estate securities.
Private equity. Investments in private partnerships that invest in private or public securities typically through privately-negotiated and/or structured transactions, including leveraged buyouts, venture capital, and distressed debt.
The investment strategies for the predecessor periods followed a policy to preserve the plans' capital and maximize investment earnings in excess of inflation within acceptable levels of capital market volatility. To accomplish this goal, the plans' assets were managed to optimize long-term return while maintaining a high standard of portfolio quality and diversification. In developing the allocation policy for the assets of the pension and other postretirement benefit plans, the Company examined projections of asset returns and volatility over a long-term horizon. In connection with this analysis, the risk and return trade-offs of alternative asset classes and asset mixes were evaluated given long-term historical relationships as well as prospective capital market returns. The Company also conducted asset-liability studies to match projected asset growth with projected liability growth to determine whether there is sufficient liquidity for projected benefit payments. Asset mix guidelines were developed by incorporating the results of these analyses with an assessment of the Company's risk posture, and taking into account industry practices. The Company periodically evaluated its investment strategy to ensure that plan assets were sufficient to meet the benefit obligations of the plans. As part of the ongoing evaluation, the Company made changes to its targeted asset allocations and investment strategy.
Benefit Plan Asset Fair Values
Following are the fair value measurements for the pension plan and the other postretirement benefit plan assets as of December 31, 2017 and 2016. The fair values presented are prepared in accordance with GAAP. For purposes of determining the fair value of the pension plan and other postretirement benefit plan assets and the appropriate level designation for the successor period, management relies on information provided by the plan's trustee. This information is reviewed and evaluated by management with changes made to the trustee information as appropriate. Management believes the portfolio is well-diversified with no significant concentrations of risk.
Valuation methods of the primary fair value measurements disclosed in the following tables are as follows:
Domestic and international equity.Investments in equity securities such as common stocks, American depositary receipts, and real estate investment trusts that traderecorded on a public exchange are classified as Level 1 investments and are valued at the closing price in the active market. Equity investments with unpublished prices (i.e. pooled funds) are valued as Level 2, when the underlying holdings used to value the investment are comprised of Level 1 or Level 2 equity securities.
Fixed income.Investments in fixed income securities are generally classified as Level 2 investments and are valued based on prices reported in the market place. Additionally, the value of fixed income securities takes into consideration certain items such as broker quotes, spreads, yield curves, interest rates, and discount rates that apply to the term of a specific instrument.
Real estate investments, private equity, and special situations investments.Investments in real estate, private equity, and special situations are generally classified as Net Asset Value as a Practical Expedient, since the underlying assets typically do not have publicly available observable inputs. The fund manager values the assets using various inputs and techniques depending on the nature of the underlying investments. Techniques may include purchase multiples for comparable transactions, comparable public company trading multiples, discounted cash flow analysis, prevailing market capitalization rates, recent sales of comparable investments, and independent third-party appraisals. The fair value of partnerships is determined by aggregating the value of the underlying assets less liabilities.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


The fair values of pension plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases. For 2017 and 2016, special situations (absolute return and hedge funds) investment assets are presented in the table below based on the nature of the investment.
 Fair Value Measurements Using  
 
Quoted Prices
in Active Markets for Identical Assets
 Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$155
 $323
 $
 $
 $478
International equity(*)

 166
 
 
 166
Fixed income:         
U.S. Treasury, government, and agency bonds
 85
 
 
 85
Corporate bonds
 39
 
 
 39
Cash equivalents and other84
 25
 
 48
 157
Real estate investments3
 
 
 16
 19
Private equity
 
 
 1
 1
Total$242
 $638
 $
 $65
 $945
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
 Fair Value Measurements Using    
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016: (Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)    
Assets:         
Domestic equity(*)
$142
 $343
 $
 $
 $485
International equity(*)

 185
 
 
 185
Fixed income:         
U.S. Treasury, government, and agency bonds
 85
 
 
 85
Corporate bonds
 41
 
 
 41
Pooled funds
 66
 
 
 66
Cash equivalents and other12
 5
 
 83
 100
Real estate investments4
 
 
 15
 19
Private equity
 
 
 2
 2
Total$158
 $725
 $
 $100
 $983
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


The fair values of other postretirement benefit plan assets as of December 31, 2017 and 2016 are presented below. These fair value measurements exclude cash, receivables related to investment income, pending investments sales, and payables related to pending investment purchases. For 2017 and 2016, special situations (absolute return and hedge funds) investment assets are presented in the table below based on the nature of the investment.
 Fair Value Measurements Using  
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2017:(Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)
Assets:         
Domestic equity(*)
$3
 $69
 $
 $
 $72
International equity(*)

 22
 
 
 22
Fixed income:        

Pooled funds
 24
 
 
 24
Cash equivalents and other2
 
 
 1
 3
Total$5
 $115
 $
 $1
 $121
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
 Fair Value Measurements Using    
 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Net Asset Value as a Practical Expedient  
As of December 31, 2016: (Level 1) (Level 2) (Level 3) (NAV) Total
 (in millions)    
Assets:         
Domestic equity(*)
$3
 $58
 $
 $
 $61
International equity(*)

 18
 
 
 18
Fixed income:         
Pooled funds
 23
 
 
 23
Cash equivalents and other1
 
 
 2
 3
Total$4
 $99
 $
 $2
 $105
(*)Level 1 securities consist of actively traded stocks while Level 2 securities consist of pooled funds.
Employee Savings Plan
SCS sponsors 401(k) defined contribution plans covering certain eligible Southern Company Gas employees. Through December 31, 2017, the 401(k) plans provided matching contributions of either 65% on up to 8% of an employee's eligible compensation, or a 100% matching contribution on up to 3% of an employee's eligible compensation, followed by a 75% matching contribution on up to the next 3% of an employee's eligible compensation. Total matching contributions made to the 401(k) plans for the successor periods ended December 31, 2017 and 2016 were $17 million and $8 million, respectively, and for the predecessor periods ended June 30, 2016 and December 31, 2015 were $10 million and $16 million, respectively.
For employees not accruing a benefit under the pension plan, additional contributions made to the 401(k) plans for the successor period ended December 31, 2017 were $2 million, for the successor period ended December 31, 2016 were not material, and for the predecessor periods ended June 30, 2016 and December 31, 2015 were $2 million for each period.
Effective January 1, 2018, the 401(k) plans were merged into the Southern Company Employee Savings Plan, which is a defined contribution plan covering substantially all employees of the Company. Under this plan, the Company matches a portion of the first 6% of employee base salary contributions. The maximum Company match is 5.1% of an employee's base salary.
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3. CONTINGENCIES AND REGULATORY MATTERS
General Litigation Matters
Nicor Gas and Nicor Energy Services Company, wholly-owned subsidiaries of the Company, and Nicor Inc. were defendants in a putative class action initially filed in 2011 in the state court in Cook County, Illinois. The plaintiffs purported to represent a class of the customers who purchased the Gas Line Comfort Guard product from Nicor Energy Services Company and variously alleged that the marketing, sale, and billing of the Gas Line Comfort Guard product violated the Illinois Consumer Fraud and Deceptive Business Practices Act, constituting common law fraud and resulting in unjust enrichment of these entities. The plaintiffs sought, on behalf of the classes they purported to represent, actual and punitive damages, interest, costs, attorney fees, and injunctive relief. On February 8, 2017, the judge denied the plaintiffs' motion for class certification and the Company's motion for summary judgment. On March 7, 2017, the parties reached a settlement, which was finalized and effective on April 3, 2017. The settlement did not have a material impact on the Company's financial statements.
The Company is assessing its alleged involvement in an incident that occurred in one of its service territories that resulted in several deaths, injuries, and property damage. One of the Company's utilities has been named as one of the defendants in several lawsuits related to this incident. The Company has insurance that provides full coverage of any financial exposure in excess of $11 million that is related to this incident. During the successor period ended December 31, 2016 and the predecessor period ended December 31, 2015, the Company recorded reserves for substantially all of its potential exposure from these cases. The ultimate outcome of this matter cannot be determined at this time.
The Company is subject to certain claims and legal actions arising in the ordinary course of business. The ultimate outcome of these matters and such pending or potential litigation against the Company cannot be determined at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on the Company's financial statements.
Environmental Matters
The Company's operations are regulated by state and federal environmental agencies through a variety of laws and regulations governing air, water, land, and protection of other natural resources. The Company maintains a comprehensive environmental compliance strategy to assess upcoming requirements and compliance costs associated with these environmental laws and regulations. The costs, including capital expenditures and operations and maintenance costs, required to comply with environmental laws and regulations impact future results of operations, cash flows, and financial condition. Compliance costs may result from the installation of additional environmental controls. Compliance with these environmental requirements involves significant capital and operating costs to clean up affected sites. The Company conducts studies to determine the extent of any required clean up and has recognized in its financial statements the costs to clean up known impacted sites. The natural gas distribution utilities in Illinois, New Jersey, Georgia, and Florida have each received authority from their applicable state regulatory agencies to recover approved environmental compliance costs through regulatory mechanisms.
The Company is subject to environmental remediation liabilities associated with 46 former MGP sites in five different states. Accrued environmental remediation costs of $388 million and $426 million have been recorded in the balance sheets as of December 31, 2017 and 2016, respectively. These environmental remediation expenditures are recoverable from customers through rate mechanisms approved by the applicable state regulatory agencies, with the exception of one site representing $2 million of the accrued remediation costs.
In 2015, the EPA filed an administrative complaint and notice of opportunity for hearing against Nicor Gas. The complaint alleged violation of the regulatory requirements applicable to polychlorinated biphenyls in the Nicor Gas distribution system and the EPA sought a total civil penalty of $0.3 million. On January 26, 2017, the EPA notified Nicor Gas that it agreed to voluntarily dismiss its administrative complaint with prejudice and without payment of a civil penalty or other further obligation on the part of Nicor Gas.
The Company's ultimate environmental compliance strategy and future environmental capital expenditures will be affected by the final requirements of new or revised environmental regulations and the outcome of any legal challenges to the environmental rules. The ultimate outcome of these matters cannot be determined at this time.
FERC Matters
At December 31, 2017, gas midstream operations was involved in two gas pipeline construction projects. These projects, along with the Company's existing pipelines, are intended to provide diverse sources of natural gas supplies to customers, resolve current and long-term supply planning for new capacity, enhance system reliability, and generate economic development in the
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areas served. On October 13, 2017, the Atlantic Coast Pipeline project received FERC approval. On January 19, 2018, the PennEast Pipeline project received FERC approval.
Additionally, on August 1, 2017, the Dalton Pipeline was placed in service as authorized by the FERC and transportation service for customers commenced. See Note 4 for additional information.
Regulatory Matters
Regulatory Infrastructure Programs
The Company has infrastructure improvement programs at several of its utilities. Descriptions of these programs are as follows:
Nicor Gas
In 2013, Illinois enacted legislation that allows Nicor Gas to provide more widespread safety and reliability enhancements to its distribution system. The legislation stipulates that rate increases to customers as a result of any infrastructure investments shall not exceed a cumulative annual average of 4.0% or, in any given year, 5.5%, of base rate revenues. In 2014, the Illinois Commission approved the nine-year regulatory infrastructure program, Investing in Illinois, under which Nicor Gas implemented rates that became effective in March 2015.
Investing in Illinois is subject to annual review by the Illinois Commission. In conjunction with the base rate case order issued by the Illinois Commission on January 31, 2018, Nicor Gas is recovering the portion of these program costs incurred prior to December 31, 2017 through base rates. See "Base Rate Cases" herein for additional information.
Atlanta Gas Light
Atlanta Gas Light's STRIDE program, which was initially approved by the Georgia PSC in 2009, is comprised of the Integrated System Reinforcement Program (i-SRP), the Integrated Customer Growth Program (i-CGP), and the Integrated Vintage Plastic Replacement Program (i-VPR) and consists of infrastructure development, enhancement, and replacement programs that are used to update and expand distribution systems and LNG facilities, improve system reliability, and meet operational flexibility and growth. For 2017 and subsequent years, the recovery of and return on current and future capital investments under the STRIDE program are included in the annual base rate revenue adjustment under GRAM.
The i-CGP program authorized Atlanta Gas Light to spend $91 million through 2017 on projects to extend its pipeline facilities to serve customers in areas without pipeline access and create new economic development opportunities in Georgia. This program ended in 2017 and was replaced with a tariff to provide up to $15 million annually for Atlanta Gas Light to commit to strategic economic development projects.
The i-SRP program authorized $445 million of capital spending through 2017 for projects to upgrade Atlanta Gas Light's distribution system and LNG facilities in Georgia, improve its peak-day system reliability and operational flexibility, and create a platform to meet long-term forecasted growth. In August 2016, Atlanta Gas Light filed a petition with the Georgia PSC for approval of a four-year extension of its i-SRP seeking approval to invest an additional $177 million to improve and upgrade its core gas distribution system in years 2017 through 2020.
The i-VPR program authorized Atlanta Gas Light to spend $275 million through 2017 to replace 756 miles of aging plastic pipe that was installed primarily in the mid-1960s to the early 1980s. Atlanta Gas Light has identified approximately 3,300 miles of vintage plastic mains in its system that should be considered for potential replacement.
See "Base Rate Cases" herein for additional information.
The orders for the STRIDE programs provide for recovery of all prudent costs incurred in the performance of the program. Atlanta Gas Light will recover from end-use customers, through billings to Marketers, the costs related to the programs net of any cost savings from the programs. The regulatory asset represents recoverable incurred costs related to the programs that will be collected in future rates charged to customers through the rate riders. The future expected costs to be recovered through rates related to allowed, but not incurred costs, are recognized in an unrecognized ratemaking amount that is not reflectedgross basis on the balance sheets. This allowed cost is primarily the equity return on the capital investment under the program. See "Unrecognized Ratemaking Amounts"herein for additional information.
Atlanta Gas Light capitalizessheet as energy marketing receivables and depreciates the capital expenditure costs incurred from the STRIDE programs over the life of the assets. Operations and maintenance costs are expensed as incurred. Recoveries, which are recorded as revenue, are based on a formula that allows Atlanta Gas Light to recover operations and maintenance costs in excess of those included in its current base rates, depreciation, and an allowed rate of return on capital expenditures. However, Atlanta Gas Light is allowed the recovery of carrying costs on the under recovered balance resulting from the timing difference.
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Elizabethtown Gas
Elizabethtown Gas' 2013 extension of the Aging Infrastructure Replacement (AIR) enhanced infrastructure program allowed for infrastructure investment of $115 million over four years and was focused on the replacement of aging cast iron in its pipeline system. Carrying charges on the additional capital spend are being accrued and deferred for regulatory purposes at a weighted average cost of capital of 6.65%. Effective July 1, 2017, investments under this program, which ended September 30, 2017, are being recovered through base rate revenues. See "Base Rate Cases" herein for additional information.
In 2015, Elizabethtown Gas filed the Safety, Modernization and Reliability Tariff plan with the New Jersey BPU seeking approval to invest more than $1.1 billion to replace 630 miles of vintage cast iron, steel, and copper pipeline, as well as 240 regulator stations. During the first quarter 2018, Elizabethtown Gas withdrew this filing in response to a proposed rule by the New Jersey BPU to incentivize utilities to accelerate investment in infrastructure replacement programs that enhance reliability, resiliency, and/or safety of the distribution system. The ultimate outcome of this matter cannot be determined at this time.
Virginia Natural Gas
In 2012, the Virginia Commission approved the Steps to Advance Virginia's Energy (SAVE) program, an accelerated infrastructure replacement program, to be completed over a five-year period. This program included a maximum allowance for capital expenditures of $25 million per year, not to exceed $105 million in total.
In March 2016, the Virginia Commission approved an extension to the SAVE program for Virginia Natural Gas to replace more than 200 miles of aging pipeline infrastructure and invest up to $30 million in 2016 and up to $35 million annually through 2021.energy marketing payables.
The SAVE program is subject to annual review by the Virginia Commission. In conjunction with the base rate case order issued by the Virginia Commission on December 21, 2017, Virginia Natural Gas is recovering the portion of these program costs incurred prior to September 1, 2017 through base rates. See "Base Rate Cases" herein for additional information.
Florida City Gas
In 2015, the Florida PSC approved Florida City Gas' Safety, Access, and Facility Enhancement program, under which costs incurred for replacing aging pipes are recovered through a rate rider with annual adjustments and true-ups. Under the program, Florida City Gas is authorized to spend $105 million over a 10-year period on infrastructure relocation and enhancement projects.
PRP Settlement
In 2015, Atlanta Gas Light received a final order from the Georgia PSC for a rate true-up of allowed unrecovered revenue through 2014 related to its PRP. This order allows Atlanta Gas Light to recover $144 million of the $178 million previously unrecovered program revenue. The remaining $34 million requested related primarily to previously unrecognized ratemaking amounts and didRegistrants do not haveanticipate a material impactadverse effect on the Company's financial statements. The Company also recognized $1 million of interest expense and $5 million in operations and maintenance expense related to the PRP on the Company's statements of income for the predecessor year ended December 31, 2015. See "Unrecognized Ratemaking Amounts"herein for additional information.
As a result of the PRP settlement, Atlanta Gas Light began recovering incremental PRP surcharge amounts through three phased in increases in addition to its previously existing PRP surcharge amount, which was established to address recovery of the unrecovered PRP balance of $144 million in 2015 and the estimated amounts to be earned under the program through 2025. The initial incremental surcharge of approximately $15 million annually was effective in October 2015, with additional annual increases of approximately $15 million in each of October 2016 and 2017. The final increase scheduled for October 2017 was included in the implementation of GRAM in March 2017. The under recovered balance is the result of the continued revenue requirement earned under the program offset by the existing and incremental PRP surcharges. The unrecovered balance at December 31, 2017 was $187 million, including $104 million of unrecognized equity return. The PRP surcharge will remain in effect until the earlier of the full recovery of the under recovered amount or December 31, 2025. See "Base Rate Cases" herein for additional information on GRAM.
One of the capital projects under the PRP experienced construction issues and Atlanta Gas Light was required to complete mitigation work prior to placing it in service. These mitigation costs will be included in future base rates in 2018. Provisions in the order resulted in the recognition of $5 million in operations and maintenance expense for the predecessor year ended December 31, 2015 on the Company's statements of income. In 2017, Atlanta Gas Light recovered $20 million from the settlement of contractor litigation claims and continues to pursue contractual and legal claims against a third-party contractor. Mitigation costs recovered through the legal process are retained by Atlanta Gas Light. The ultimate outcome of this matter cannot be determined at this time.
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Base Rate Cases
Settled Base Rate Cases
On February 21, 2017, the Georgia PSC approved GRAM and a $20 million increase in annual base rate revenues for Atlanta Gas Light, effective March 1, 2017. GRAM adjusts base rates annually, up or down, using an earnings band based on the previously approved ROE of 10.75% and does not collect revenue through special riders and surcharges. Atlanta Gas Light adjusts rates up to
the lower end of the band of 10.55% and adjusts rates down to the higher end of the band of 10.95%. Various infrastructure programs previously authorized by the Georgia PSC under Atlanta Gas Light's STRIDE program, which include the i-VPR and i-SRP, will continue under GRAM and the recovery of and return on the infrastructure program investments will be included in annual base rate adjustments. The Georgia PSC will review Atlanta Gas Light's performance annually under GRAM.
Pursuant to the GRAM approval, Atlanta Gas Light and the staff of the Georgia PSC agreed to a variation to the i-CGP that was formerly part of Atlanta Gas Light's STRIDE program. As a result, a new tariff was created, effective October 10, 2017, to provide up to $15 million annually for Atlanta Gas Light to commit to strategic economic development projects. Projects under this tariff must be approved by the Georgia PSC.
Beginning with the next rate adjustment in June 2018, Atlanta Gas Light's recovery of the previously unrecovered Pipeline Replacement Program revenue through 2014, as well as the mitigation costs associated with the Pipeline Replacement Program that were not previously included in its rates, will also be included in GRAM. In connection with the GRAM approval, the last monthly Pipeline Replacement Program surcharge increase became effective March 1, 2017.
On June 30, 2017, the New Jersey BPU approved a settlement that provides for a $13 million increase in annual base rate revenues, effective July 1, 2017, based on a ROE of 9.6%. Also included in the settlement was a new composite depreciation rate that is expected to result in a $3 million annual reduction of depreciation. See Note 11 under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for information on the proposed sale of Elizabethtown Gas.
On December 21, 2017, the Virginia Commission approved a settlement for a $34 million increase in annual base rate revenues, effective September 1, 2017, including $13 million related to the recovery of investments under the SAVE program. See "Regulatory Infrastructure Programs" herein for additional information. An authorized ROE range of 9.0% to 10.0% with a midpoint of 9.5% will be used to determine the revenue requirement in any filing, other than for a change in base rates.
On January 31, 2018, the Illinois Commission approved a $137 million increase in annual base rate revenues, including $93 million related to the recovery of investments under the Investing in Illinois program, effective February 8, 2018, based on a ROE of 9.8%.
Pending Base Rate Cases
On October 23, 2017, Florida City Gas filed a general base rate case with the Florida PSC requesting a $19 million increase in annual base rate revenues. On January 29, 2018, Florida City Gas filed an update to incorporate the effects of the Tax Reform Legislation that, if approved, would reduce the requested base rate revenues by $4 million. The requested increase is based on a 2018 projected test year and a ROE of 11.25%. The requested increase includes $3 million related to the recovery of investments under SAFE that are currently being recovered through a surcharge. Additionally, Florida City Gas requested an interim rate increase of $5 million annually that was approved and became effective January 12, 2018, subject to refund. The Florida PSC is expected to rule on the requested increase in mid-2018.
On December 1, 2017, Atlanta Gas Light filed its 2018 annual rate adjustment with the Georgia PSC. If approved, annual base rate revenues will increase by $22 million, effective June 1, 2018. Atlanta Gas Light will file a revised rate adjustment to incorporate the effects of the Tax Reform Legislation in the first quarter 2018. The Georgia PSC is expected to rule on the revised requested increase in the second quarter 2018.
On February 15, 2018, Chattanooga Gas filed a general base rate case with the Tennessee Public Utility Commission requesting a $7 million increase in annual base rate revenues. The requested increase, which incorporated the effects of the Tax Reform Legislation, was based on a projected test year ending June 30, 2019 and a ROE of 11.25%. The Tennessee Public Utility Commission is expected to rule on the requested increase in the third quarter 2018.
The ultimate outcome of these pending base rate cases cannot be determined at this time.
Other
The New Jersey BPU, Virginia Commission, Tennessee Public Utility Commission, and Maryland PSC each issued an order effective January 1, 2018 that requires utilities in their respective states to track as a regulatory liability the impact of the Tax Reform Legislation, including the reduction in the corporate income tax rate to 21% and the impact of excess deferred income
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taxes. The New Jersey BPU's order requires Elizabethtown Gas to file by March 2, 2018 proposed revised base rates with an April 1, 2018 interim effective date and a July 1, 2018 final effective date. Virginia Natural Gas will address the Virginia Commission's order in its Annual Information Filing, which will be filed by July 1, 2018. The Tennessee Public Utility Commission's order required Chattanooga Gas to file proposals to reduce rates or make other ratemaking adjustments to account for the impact of the Tax Reform Legislation. Chattanooga Gas made the required filing as part of its February 15, 2018 general base rate case filing. The Maryland PSC's order required Elkton Gas to file an explanation of the impact of the Tax Reform Legislation on its expenses and revenues, as well as when and how it expects to pass through to its customers those effects. Elkton Gas made the required filing on February 15, 2018 and will reduce annual base rates by $0.1 million effective April 1, 2018. Credits will be issued to customers for the impact of the Tax Reform Legislation from January 2018 through March 2018.
The Illinois Commission issued an order effective January 25, 2018 that requires utilities in the state to record the impacts of the Tax Reform Legislation, including the reduction in the corporate income tax rate to 21% and the impact of excess deferred income taxes, as a regulatory liability. On February 20, 2018, the Illinois Commission granted Nicor Gas' application for rehearing to file revised base rates and tariffs, which Nicor Gas expects to file by the end of the second quarter 2018.
The ultimate outcome of these matters cannot be determined at this time.
energySMART
In 2014, the Illinois Commission approved Nicor Gas' energySMART through 2017, which outlined energy efficiency program offerings and therm reduction goals, and subsequently extended the program to 2021. Through December 31, 2017, Nicor Gas spent $107 million of the initial authorized expenditure of $113 million. A new four-year program began on January 1, 2018, with an additional authorized expenditure of $160 million.
Unrecognized Ratemaking Amounts
The following table illustrates the Company's authorized ratemaking amounts that are not recognized on its balance sheets. These amounts are primarily composed of an allowed equity rate of return on assets associated with certain of the Company's regulatory infrastructure programs. These amounts will be recognized as revenues in the Company's financial statements in the periods they are billable to customers, the majority of which will be recovered by 2025.
 December 31, 2017 December 31, 2016
 (in millions)
Atlanta Gas Light$104
 $110
Virginia Natural Gas11
 11
Elizabethtown Gas(*)
8
 6
Nicor Gas2
 2
Total$125
 $129
(*) See Note 11 under "Proposed Sale of Elizabethtown Gas and Elkton Gas" for information on the pending asset sale.
Other Matters
A wholly-owned subsidiary of the Company owns and operates a natural gas storage facility consisting of two salt dome caverns in Louisiana. Periodic integrity tests are required in accordance with rules of the Louisiana Department of Natural Resources (DNR). In August 2017, in connection with an ongoing integrity project, updated seismic mapping indicated the proximity of one of the caverns to the edge of the salt dome may be less than the required minimum and could result in the Company retiring the cavern early. At December 31, 2017, the facility's property, plant, and equipment had a net book value of $112 million, of which the cavern itself represents approximately 20%. A potential early retirement of this cavern is dependent upon several factors including compliance with an order from the Louisiana DNR detailing the requirements to place the cavern back in service, which includes, among other things, obtaining core samples to determine the composition of the sheath surrounding the edge of the salt dome.
The cavern continues to maintain its pressures and overall structural integrity. These events were considered in connection with the Company's annual long-lived asset impairment analysis, which determined there was no impairment as of December 31, 2017. Any changes in results of monitoring activities, rates at which expiring capacity contracts are re-contracted, timing of placing the cavern back in service, or Louisiana DNR requirements could trigger impairment. Further, early retirement of the cavern could trigger impairment of other long-lived assets associated with the natural gas storage facility. The ultimate outcome of this matter cannot be determined at this time, but could have a material impact on the Company's financial statements.
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4. JOINT OWNERSHIP AGREEMENTS
In 2014, the Company entered into a construction and ownership arrangement associated with the Dalton Pipeline through which the Company has a 50% undivided ownership interest jointly with The Williams Companies, Inc. in the 115-mile Dalton Pipeline to serve as an extension of the Transco natural gas pipeline system into northwest Georgia. The Company also entered into an agreement to lease its 50% undivided ownership in the Dalton Pipeline that became effective when it was placed in service on August 1, 2017. Under the lease, the Company will receive approximately $26 million annually for an initial term of 25 years. The lessee is responsible for maintaining the pipeline during the lease term and for providing service to transportation customers under its FERC-regulated tariff. At December 31, 2017, the net book value of the Company's 50% share of the pipeline was $252 million and is reflected in total property, plant, and equipment in the balance sheet. At December 31, 2016, the net book value of the Company's 50% share of the pipeline was $124 million and is reflected in construction work in progress in the balance sheet.
Variable Interest Entities
SouthStar, previously a joint venture owned 85% by the Company and 15% by Piedmont, was the only VIE for which the Company was the primary beneficiary, prior to October 2016 when the Company completed its purchase of Piedmont's remaining interest in SouthStar.
In 2015, Georgia Natural Gas Company (GNG), a 100%-owned, direct subsidiary of the Company, notified Piedmont of its election, pursuant to a change in control of SouthStar, to purchase Piedmont's 15% interest in SouthStar at fair market value. This purchase was contingent upon the closing of the merger between Piedmont and Duke Energy Corporation (Duke Energy). In October 2016, after Piedmont and Duke Energy completed their merger, GNG completed its purchase of Piedmont's interest in SouthStar and paid a purchase price of $160 million and $15 million for Piedmont's share of SouthStar's 2016 earnings through the date of acquisition.
At December 31, 2015, the Company presented the noncontrolling interest related to Piedmont's interest in SouthStar as a component in equity. During the first quarter 2016, the Company reclassified its noncontrolling interest, whose redemption was beyond the Company's control, as a contingently redeemable noncontrolling interest. Upon Piedmont and Duke Energy obtaining the necessary merger approval, the Company deemed this noncontrolling interest to be mandatorily redeemable and reclassified it to a current liability during the third quarter 2016. The roll-forwards of the redeemable noncontrolling interest for the successor period of July 1, 2016 through December 31, 2016 and the predecessor period of January 1, 2016 through June 30, 2016 are detailed below:
Predecessor –(in millions)
Balance at December 31, 2015$
Reclassification of noncontrolling interest to contingently redeemable noncontrolling interest46
Net income attributable to noncontrolling interest14
Distribution to noncontrolling interest(19)
Balance at June 30, 2016$41
Successor –(in millions)
Balance at July 1, 2016$174
Reclassification of contingently redeemable noncontrolling interest to mandatorily redeemable
noncontrolling interest
(174)
Balance at December 31, 2016$
The Company's cash flows used for financing activities included SouthStar's distribution to Piedmont for its portion of SouthStar's annual earnings from the previous year, which generally occurred in the first quarter of each year. For the successor period of July 1, 2016 through December 31, 2016, SouthStar made a distribution of $15 million upon completion of the purchase of Piedmont's interest in SouthStar. For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, SouthStar distributed to Piedmont $19 million and $18 million, respectively.
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Equity Method Investments
The carrying amounts of the Company's equity method investments as of December 31, 2017 and 2016 and related income from those investments for the successor periods of the year ended December 31, 2017 and July 1, 2016 through December 31, 2016 and predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015 were as follows:
Balance Sheet InformationDecember 31, 2017  December 31, 2016
 (in millions)
SNG(*)
$1,262
  $1,394
Triton42
  44
Horizon Pipeline30
  30
PennEast Pipeline57
  22
Atlantic Coast Pipeline41
  33
Pivotal JAX LNG, LLC44
  16
Other1
  2
Total$1,477
  $1,541
(*)Includes a $104 million decrease at December 31, 2017 related to the impact of the Tax Reform Legislation and new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings.
 Successor Predecessor
Income Statement InformationYear ended December 31, 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 Year ended December 31, 2015
 (in millions) (in millions)
SNG$88
 $56
  $
 $
Triton4
 2
  1
 4
Horizon Pipeline2
 1
  1
 2
Atlantic Coast Pipeline6
 1
  
 
PennEast Pipeline6
 
  
 
Total$106
 $60
  $2
 $6
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SNG
In September 2016, the Company, through a wholly-owned, indirect subsidiary, acquired a 50% equity interest in SNG, which is accounted for as an equity method investment. See Note 11 under "Investment in SNG" for additional information. Selected financial information of SNG as of December 31, 2017 and 2016 and for the year ended December 31, 2017 and for the period September 1, 2016 through December 31, 2016 is as follows:
 As of December 31,
Balance Sheet Information2017 2016
 (in millions)
Current assets$82
 $95
Property, plant, and equipment2,439
 2,451
Deferred charges and other assets121
 129
Total Assets$2,642
 $2,675
    
Current liabilities$110
 $588
Long-term debt1,102
 706
Other deferred charges and other liabilities76
 22
Total Liabilities$1,288
 $1,316
    
Total Stockholders' Equity1,354
 1,359
Total Liabilities and Stockholders' Equity$2,642
 $2,675
Income Statement InformationYear ended December 31, 2017 September 1, 2016
through December 31, 2016
 (in millions)
Revenues$544
 $230
Operating income246
 138
Net income$175
 $115
Other Investments
Triton
The Company has an investment in Triton, a cargo container leasing company, which is aggregated into its all other segment. Container equipment that is acquired by Triton is accounted for in tranches as defined in Triton's operating agreement and investors make capital contributions to Triton to invest in each of the tranches. As of December 31, 2017, the Company had invested in seven tranches established by Triton.
Horizon Pipeline
The Company owns aninterest in a joint venture with Natural Gas Pipeline Company of America that is regulated by the FERC. Horizon Pipeline operates a 70-mile natural gas pipeline from Joliet, Illinois to near the Wisconsin/Illinois border. Nicor Gas typically contracts for 70% to 80% of the total annual capacity.
PennEast Pipeline
In 2014, the Company entered into a partnership in which it holds a 20% ownership interest in an interstate pipeline company formed to develop and operate a 118-mile natural gas pipeline between New Jersey and Pennsylvania. The initial transportation capacity of 1.0 billion cubic feet (Bcf) per day, is under long-term contracts, mainly by public utilities and other market-serving entities, such as electric generation companies, in New Jersey, Pennsylvania, and New York. On January 19, 2018, the PennEast Pipeline project received FERC approval.
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Atlantic Coast Pipeline
In 2014, the Company entered into a project in which it holds a 5% ownership interest in an interstate pipeline company formed to develop and operate a 594-mile natural gas pipeline in North Carolina, Virginia, and West Virginia with initial transportation capacity of 1.5 Bcf per day. On October 13, 2017, the Atlantic Coast Pipeline project received FERC approval.
Pivotal JAX LNG, LLC
The Company owns a 50% interest in a planned LNG liquefaction and storage facility in Jacksonville, Florida. Once construction is complete and the facility is operational, it will be outfitted with a 2.0 million gallon storage tank with the capacity to produce in excess of 120,000 gallons of LNG per day.
5. INCOME TAXES
Subsequent to the Merger, Southern Company files a consolidated federal income tax return and various combined and separate state income tax returns on behalf of the Company. Under a joint consolidated income tax allocation agreement, each Southern Company subsidiary's current and deferred tax expense is computed on a stand-alone basis and no subsidiary is allocated more current expense than would be paid if it filed a separate income tax return. In accordance with IRS regulations, each company is jointly and severally liable for the federal tax liability. Prior to the Merger, the Company filed a U.S. federal consolidated income tax return and various state income tax returns.
Federal Tax Reform Legislation
Following the enactment of the Tax Reform Legislation, the SEC staff issued Staff Accounting Bulletin 118 – "Income Tax Accounting Implications of the Tax Cuts and Jobs Act" (SAB 118), which provides for a measurement period of up to one year from the enactment date to complete accounting under GAAP for the tax effects of the legislation. Due to the complex and comprehensive nature of the enacted tax law changes, and their application under GAAP, the Company considers all amounts recorded in the financial statements as a result of the Tax Reform Legislation to be "provisional" as discussed in SAB 118 and subject to revision. The Company is awaiting additional guidance from industry and income tax authorities in order to finalize its accounting. The ultimate impactcounterparty nonperformance.
15. ACQUISITIONS AND DISPOSITIONS
None of the Tax Reform Legislation on deferred income tax assetsdispositions discussed herein, both individually and liabilities and the related regulatory assets and liabilities cannot be determined at this time.
Current and Deferred Income Taxes
Details of income tax provisions are as follows:
 Successor Predecessor
 Year ended December 31, 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 Year ended December 31, 2015
 (in millions) (in millions)
Federal —        
Current$103
 $
  $67
 $(13)
Deferred170
 65
  8
 198
 273
 65
  75
 185
State —        
Current27
 (16)  12
 10
Deferred67
 27
  
 18
 94
 11
  12
 28
Total$367
 $76
  $87
 $213
Net cash payments (refunds) for income taxescombined, represented a strategic shift in operations for the successor periodsapplicable Registrants that has, or is expected to have, a major effect on its operations and financial results; therefore, none of the year endedassets related to the sales have been classified as discontinued operations for any of the periods presented.
Southern Company
In October 2021, Southern Company completed the sale of a leveraged lease investment to the lessee for $45 million. No gain or loss was recognized on the sale; however, it did result in the recognition of approximately $16 million of additional tax benefits. Prior to the sale, in the second quarter 2021, a charge of $7 million ($6 million after tax) was recorded to reduce the investment to its estimated fair value, less costs to sell.
In December 31, 20172021, Southern Company completed the termination of its leasehold interest in assets associated with its two international leveraged lease projects and July 1, 2016 through December 31, 2016received cash proceeds of approximately $673 million after the accelerated exercise of the lessee's purchase options. The pre-tax gain associated with the transaction was approximately $93 million ($99 million gain after tax).
Alabama Power
In September 2022, Alabama Power completed its acquisition of the Calhoun Generating Station, which was accounted for as an asset acquisition. The total purchase price was $179 million, of which $171 million was related to net assets recorded within property, plant, and equipment on the predecessor periodsbalance sheet and reflected in property additions within the investing section of January 1, 2016 through June 30, 2016the statement of cash flows. The remainder primarily related to fossil fuel stock and the year ended December 31, 2015 were $72 million, $23 million, $(100) million,materials and $(26) million, respectively.supplies. See Note 2 under "Alabama Power – Rate CNP New Plant" for additional information.
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Southern Company GasPower
Southern Power's acquisition-related costs for the projects discussed under "Asset Acquisitions" and Subsidiary Companies 2017 Annual Report"Construction Projects" were not material for any of the years presented. There were no asset acquisitions during 2022.

Asset Acquisitions

Project
Facility
ResourceSeller
Approximate Nameplate Capacity (MW)
LocationSouthern
Power
Ownership
Percentage
Expected/Actual CODPPA
Contract Period
Asset Acquisitions During 2023
Millers Branch(a)
Solar
EDF Renewables
Development, Inc.
200Haskell County, TX100%Fourth quarter 202520 years
South CheyenneSolarHanwha Q Cells USA Corp.150Laramie County, WY100%Second quarter 202420 years
Asset Acquisitions During 2021
Deuel Harvest(b)
WindInvenergy Renewables LLC300Deuel County, SD100% of Class BFebruary 2021
25 years
and
15 years
(a)The tax effectsproject includes an option to expand capacity up to an additional 300 MWs. Subsequent to December 31, 2023, Southern Power committed to expand the construction of temporary differences between the carrying amounts of assets and liabilitiesfacility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the second quarter 2026.
(b)In March 2021, Southern Power acquired a controlling interest in the project from Invenergy Renewables LLC and completed a tax equity transaction whereby it sold the Class A membership interests in the project. Southern Power consolidates the project's operating results in its financial statements and their respectivethe tax bases, which give rise to deferred tax assetsequity partner and liabilities, are as follows:
 2017 2016
 (in millions)
Deferred tax liabilities —   
Accelerated depreciation$1,436
 $1,954
Property basis differences204
 311
Regulatory assets associated with employee benefit obligations79
 125
Other208
 164
Total1,927
 2,554
Deferred tax assets —   
Federal net operating loss92
 59
Federal effect of state deferred taxes54
 42
Employee benefit obligations185
 165
Regulatory liability associated with the Tax Reform Legislation (not subject to
normalization)
295
 
Other223
 332
Total849
 598
Less valuation allowances(11) (19)
Total, net of valuation allowances838
 579
Accumulated deferred income taxes, net$1,089
 $1,975
Invenergy Renewables LLC each own a noncontrolling interest.
The implementation of the Tax Reform Legislation significantly reduced accumulated deferred income taxes, partially offset by
bonus depreciation provisions in the Protecting Americans from Tax Hikes Act. The Tax Reform Legislation also significantly increased tax-related regulatory liabilities.
At December 31, 2017, the tax-related regulatory liabilities to be credited to customers were $1.1 billion. These liabilities are primarily attributable to deferred taxes previously recognized at rates higher than the current enacted tax law and to unamortized ITCs.
Deferred federal and state ITCs are amortized over the average life of the related property with such amortization normally applied as a credit to reduce depreciation in the statements of income. Credits amortized in this manner amounted to $4 million and $1 millionaggregate purchase price for the successor periods of the year ended December 31, 2017 and July 1, 2016 through December 31, 2016 and for the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, were $1two projects acquired during 2023 was $193 million, and $2 million, respectively. At December 31, 2017, all ITCs available to reduce federal income taxes payable had been utilized.
Effective Tax Rate
A reconciliation of the federal statutory income tax rate to the effective income tax rate is as follows:
 Successor  Predecessor
 Year ended December 31, 2017 July 1, 2016 through December 31,
2016
  January 1, 2016 through June 30, 2016 Year ended December 31, 2015
Federal statutory rate35.0% 35.0%  35.0% 35.0%
State income tax, net of federal deduction4.0 4.0  3.5 3.4
Tax Reform Legislation15.0    
State tax legislation and rate changes6.2    
Other 1.0  (0.9) (2.0)
Effective income tax rate60.2% 40.0%  37.6% 36.4%
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


The principal differences in the Company's effective tax rate from December 31, 2016 to December 31, 2017 include the impact of the Tax Reform Legislation, the Illinois income tax legislation enacted in the third quarter 2017, new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings, the disallowance of certain nondeductible Merger-related expenses associated with change-in-control compensation charges, and an increase in earnings before income taxes.
Unrecognized Tax Benefits
The Company has no unrecognized tax benefits for any period presented.
The Company classifies interest on tax uncertainties as interest expense; however, the Company had no accrued interest or penalties for unrecognized tax benefits for any period presented.
It is reasonably possible that the amount of the unrecognized tax benefits could change within 12 months. The settlement of federal and state audits could impact the balances. At this time, an estimate of the range of reasonably possible outcomes cannot be determined.
On July 1, 2016, the Company became a wholly-owned subsidiary of Southern Company, which is a participantprimarily recorded within construction work in progress on the Compliance Assurance Process of the IRS. The IRS has finalized its audits of Southern Company's consolidated federal tax returns through 2016. However, the pre-Merger Southern Company Gas 2014, 2015, and June 30, 2016 federal tax returns are currently under audit. The audits for the Company by any state have either concluded, or the statute of limitations has expired with respect to income tax examinations, for years prior to 2011.
6. FINANCING
The Company's 100%-owned subsidiary, Southern Company Gas Capital, was established to provide for certain of the Company's ongoing financing needs through a commercial paper program, the issuance of various debt, hybrid securities, and other financing arrangements. Southern Company Gas fully and unconditionally guarantees all debt issued by Southern Company Gas Capital and the gas facility revenue bonds issued by Pivotal Utility Holdings. Additionally, substantially all of Nicor Gas' properties are subject to the lien of the indenture securing its first mortgage bonds. Nicor Gas is not permitted by regulation to make loans to affiliates or utilize Southern Company Gas Capital for its financing needs.
Securities Due Within One Year
The current portion of long-term debt is composed of the portion of its long-term debt due within the next 12 months. At December 31, 2017, the Company had $157 million of senior notes due within one year, including the fair value adjustment attributable to the application of acquisition accounting. At December 31, 2016, the Company had $22 million of medium-term notes due within one year.
Long-Term Debt
Long-term debt of the Companybalance sheet at December 31, 2017 and 2016 consisted of Series A, Series B, and Series C medium-term notes of Atlanta Gas Light; senior notes of2023.
Construction Projects
Project
Facility
Resource
Approximate Nameplate Capacity (MW)
LocationCODPPA Contract Period
Projects Completed During 2022
Garland Solar Storage(a)
Battery energy storage88Kern County, CA
September 2021 through February 2022(b)
20 years
Tranquillity Solar Storage(a)
Battery energy storage72Fresno County, CA
November 2021 through
March 2022(c)
20 years
Projects Completed During 2021
Glass Sands(d)
Wind118Murray County, OKNovember 202112 years
(a)In 2020, Southern Company Gas Capital; first mortgage bonds of Nicor Gas; and gas facility revenue bonds of Pivotal Utility Holdings.
Maturities through 2022 applicable to total long-term debt are as follows: $155 million in 2018; $350 million in 2019; $330 million in 2021; $93 million in 2022; and $4.6 billion thereafter. There are no material scheduled maturities in 2020.
Medium-Term Notes
In July 2017, Atlanta Gas Light repaid at maturity $22 million of medium-term notes. The amount of medium-term notes outstanding at December 31, 2017 and 2016 was $159 million and $181 million, respectively, including securities due within one year.
Senior Notes
In May 2017, Southern Company Gas Capital issued $450 million aggregate principal amount of Series 2017A 4.40% Senior Notes due May 30, 2047. The proceeds were used to repay the Company's short-term indebtedness and for general corporate purposes. The amount of senior notes outstanding at December 31, 2017 and 2016 was $4.2 billion and $3.7 billion, respectively, including securities due within one year.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


First Mortgage Bonds
Nicor Gas had $1.0 billion and $625 million of first mortgage bonds outstanding at December 31, 2017 and 2016, respectively. These bonds have been issued with maturities ranging from 2019 to 2057.
On August 10, 2017, Nicor Gas issued $100 million aggregate principal amount of First Mortgage Bonds 3.03% Series due August 10, 2027 and $100 million aggregate principal amount of First Mortgage Bonds 3.62% Series due August 10, 2037. On November 1, 2017, Nicor Gas issued $100 million aggregate principal amount of First Mortgage Bonds 3.85% Series due August 10, 2047 and $100 million aggregate principal amount of First Mortgage Bonds 4.00% Series due August 10, 2057. The proceeds were used to repay short-term indebtedness incurred under the Nicor Gas commercial paper program and for other working capital needs.
Gas Facility Revenue Bonds
Pivotal Utility Holdings is party to a series of loan agreements with the New Jersey Economic Development Authority and Brevard County, Florida under which five series of gas facility revenue bonds have been issued with maturities ranging from 2022 to 2033. These revenue bonds are issued by state agencies or counties to investors, and proceeds from each issuance then are loaned to Pivotal Utility Holdings. The amount of gas facility revenue bonds outstanding at December 31, 2017 and 2016 was $200 million.
The Elizabethtown Gas asset sale agreement requires that bonds representing $180 millionPower restructured its ownership of the total that are currently eligible for redemption at par be redeemed on or priorproject, while retaining the controlling interests, by contributing the Class A membership interests to consummationan existing partnership and selling 100% of the sale. The ultimate outcome of this matter cannot be determined at this time.Class B membership interests. During 2021, Southern Power further restructured its ownership in the battery energy storage projects and completed tax equity transactions whereby it sold the Class A membership interests in the projects. Southern Power consolidates each project's operating results in its financial statements and the tax equity partner and two other partners each own a noncontrolling interest. See Note 119 under "Proposed Sale of Elizabethtown Gas and Elkton Gas""Lessor" for additional information.
Parent Company Note(b)The facility has a total capacity of 88 MWs, of which 73 MWs were placed in service in 2021 and 15 MWs were placed in service in 2022.
On January 4, 2018,(c)The facility has a total capacity of 72 MWs, of which 32 MWs were placed in service in 2021 and 40 MWs were placed in service in 2022.
(d)In December 2020, Southern Company Gas issued a floating rate promissory note to Southern Company in an aggregate principal amount of $100 million due July 31, 2018, bearing interest based on one-month LIBOR.
Dividend Restrictions
By regulation, Nicor Gas is restricted, to the extent of its retained earnings balance, in the amount it can dividend or loan to affiliates and is not permitted to make money pool loans to affiliates. The New Jersey BPU restricts the amount Elizabethtown Gas can dividend to its parent company to 70% of its quarterly net income. Additionally, as stipulated in the New Jersey BPU's order approving the Merger, the Company is prohibited from paying dividends to its parent company, Southern Company, if the Company's senior unsecured debt rating falls below investment grade. As of December 31, 2017, the amount of subsidiary retained earnings restricted for dividend payment totaled $719 million.
Bank Credit Arrangements
Credit Facilities
At December 31, 2017, committed credit arrangements with banks were as follows:
Company Expires 2022 Unused
  (in millions)
Southern Company Gas Capital $1,400
 $1,390
Nicor Gas 500
 500
Total $1,900
 $1,890
In May 2017, Southern Company Gas Capital and Nicor Gas terminated their existing credit arrangements for $1.3 billion and $700 million, respectively, which were to mature in 2017 and 2018, and entered into a new multi-year credit arrangement (Facility) currently allocated for $1.4 billion and $500 million, respectively, with a maturity date of 2022, as reflected in the table above. Pursuant to the Facility, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted.
The Facility contains a covenant that limits the ratio of debt to capitalization (as defined in each facility) to a maximum of 70% for eachPower purchased 100% of the Company and Nicor Gas and contains a cross-acceleration provision to other indebtedness (including guarantee obligations)membership interests of the applicable company. Such cross-acceleration provision to other indebtedness would trigger an event of default of the applicable company if the Company or Nicor Gas defaulted on indebtedness, the payment of which was then accelerated. At December 31, 2017, both companies were in compliance with such covenant. The Facility does not contain a material adverse change clause at the time of borrowings.Glass Sands facility.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


Commercial Paper Programs
The Company maintains commercial paper programs at Southern Company Gas Capital and at Nicor Gas that consist of short-term, unsecured promissory notes. Nicor Gas' commercial paper program supports working capital needs at Nicor Gas as Nicor Gas is not permitted to make money pool loans to affiliates. All of the Company's other subsidiaries benefit from Southern Company Gas Capital's commercial paper program. Commercial paper is included in notes payable in the balance sheets.
Details of commercial paper borrowings outstanding were as follows:
  Short-term Debt at the End of the Period
  Amount
Outstanding
 Weighted Average Interest Rate
  (in millions)  
December 31, 2017:    
Southern Company Gas Capital $1,243
 1.73%
Nicor Gas 275
 1.83
Total $1,518
 1.75%
     
December 31, 2016:    
Southern Company Gas Capital $733
 1.09%
Nicor Gas 524
 0.95
Total $1,257
 1.03%
7. COMMITMENTS
Pipeline Charges, Storage Capacity, and Gas Supply
Pipeline charges, storage capacity, and gas supply include charges recoverable through a natural gas cost recovery mechanism, or alternatively, billed to Marketers and demand charges associated with Sequent. The gas supply balance includes amounts for Nicor Gas' and SouthStar's gas commodity purchase commitments of 35 million mmBtu at floating gas prices calculated using forward natural gas prices at December 31, 2017 and valued at $101 million. The Company provides guarantees to certain gas suppliers for certain of its subsidiaries in support of payment obligations.
Expected future contractual obligations for pipeline charges, storage capacity, and gas supply that are not recognized on the balance sheets as of December 31, 2017 were as follows:
 Pipeline Charges, Storage Capacity, and Gas Supply
 (in millions)
2018$813
2019552
2020416
2021375
2022339
2023 and thereafter2,294
Total$4,789
Operating Leases
The Company has operating lease agreements with various terms and expiration dates. Total rent expense was $15 million, $8 million, $6 million, and $12 million for the successor periods of the year ended December 31, 2017 and July 1, 2016 through December 31, 2016 and the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, respectively. The Company includes any step rents, escalations, and lease concessions in its computation of minimum lease payments, which are recognized on a straight-line basis over the minimum lease terms.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


As of December 31, 2017, the Company's estimated minimum lease payments under operating leases were as follows:
 Minimum Lease Payments
 (in millions)
2018$17
201916
202016
202115
202213
2023 and thereafter26
Total$103
Financial Guarantees
AGL Equipment Leasing Inc. (AEL), a wholly-owned subsidiary of the Company, holds the Company's interest in Triton and has an obligation to restore to zero any deficit in its equity account for income tax purposes in the unlikely event that Triton is liquidated and a deficit balance remains. This obligation continues for the life of the Triton partnerships. Any payment is effectively limited to the net assets of AEL, which were less than $1 million at December 31, 2017. The Company believes the likelihood of any such payment by AEL is remote and, as such, no liability has been recorded for this obligation at December 31, 2017.
8. STOCK COMPENSATION
Successor
Stock-Based Compensation
Stock-based compensation primarily in the form of Southern Company performance share units and restricted stock units may be granted through the Omnibus Incentive Compensation Plan to certain levels of management within the Company. In 2017, stock-based compensation granted to employees includes performance share units and restricted stock units. In 2016, in conjunction with the Merger, stock-based compensation was granted to certain executives in the form of Southern Company restricted stock and performance share units. As of December 31, 2017, there were 327 current and former employees participating in the performance share unit and restricted stock unit programs.
Performance Share Units
Performance share unitsPSUs granted to employees vest at the end of a three-year performance period. All unvested performance share units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the performance period with the number of shares issued ranging from 0% to 200% of the target number of performance share unitsPSUs granted, based on achievement of the performance goals established by the Compensation Committee of the Southern Company Board of Directors.
Southern Company issueshas issued two types of PSUs, each with a unique performance share units with performance goals based on three performance goals to employees.goal. These types of PSUs include performance share units with performance goalstotal shareholder return (TSR) awards based on the total shareholder return (TSR)TSR for Southern Company common stock during the three-yearthree-year performance period as compared to a group of industry peers performance share units with performance goals based on Southern Company's cumulative earnings per share (EPS) over the performance period, and performance share units with performance goalsROE awards based on Southern Company's equity-weighted ROEreturn over the performance period.
The total target grant date fair value of the stock compensation awards granted was comprised 20% each of EPS-based awards and ROE-based awards and 30% each of TSR-based awards and restricted stock units.
The fair value of TSR-based performance share unitTSR awards is determined as of the grant date using a Monte Carlo simulation modelmodel. In determining the fair value of the TSR awards issued to estimateemployees, the TSRexpected volatility is based on the historical volatility of Southern Company's common stock among the industry peers over a period equal to the performance period. Southern Company recognizesThe risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant that covers the performance period of the awards. The following table shows the assumptions used in the pricing model and the weighted average grant-date fair value of TSR awards granted:
Year Ended December 31202320222021
Expected volatility30.0%29.6%30.0%
Expected term (in years)
333
Interest rate3.8%1.7%0.2%
Weighted average grant-date fair value$76.83$79.69$69.06
The Registrants recognize TSR award compensation expense on a straight-line basis over the three-year performance period without remeasurement.
The fair values of the EPS-based awards and the ROE-basedROE awards are based on the closing stock price of Southern Company common stock on the date of the grant. The weighted average grant-date fair value of the ROE awards granted during 2023, 2022, and 2021 was $68.93, $66.87, and $59.49, respectively. Compensation expense for the EPS-based and ROE-basedROE awards is generally recognized ratably over the three-year performance period initially assuming a 100% payout at the end of theadjusted for expected changes in ROE performance. Total compensation cost recognized for vested ROE awards reflects final performance period. Employees
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NOTES (continued)metrics.
Southern Company Gas and Subsidiary Companies 2017 Annual Report


become immediatelyhad 2.4 million unvested PSUs outstanding at December 31, 2022. In February 2023, the PSUs that vested in the TSR-based performance share units, along with the EPS-based and ROE-based awards, upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility. The expected payout related to the EPS-based and ROE-based awards is reevaluated annually with expense recognized to date increased or decreased based on the number of shares currently expected to be issued. Unlike the TSR-based awards, the compensation expense ultimately recognized for the EPS-based awards and the ROE-based awards will be based on the actual number of shares issued at the end of thethree-year performance period.
For the yearperiod ended December 31, 2017, employees2022 were converted into 1.8 million shares outstanding at a share price of $67.13. During 2023, Southern Company granted 1.3 million PSUs and 1.3 million PSUs were vested or forfeited, resulting in 2.4 million unvested PSUs outstanding at December 31, 2023. In February 2024, the Company were granted 0.3 million performance share units. The weighted average grant-date fair value of TSR-based performance share units granted during 2017, determined using a Monte Carlo simulation model to estimatePSUs that vested for the TSR of Southern Company's stock among the industry peers over thethree-year performance period was $49.27. The weighted average grant-date fair value of both EPS-based and ROE-based performance share units granted during 2017 was $49.22.
For the year ended December 31, 2017, total2023 were converted into 2.3 million shares outstanding at a weighted average share price of $66.95.
Total PSU compensation cost, for performance share units recognized in income was $8 million withand the related tax benefit also recognized in income, of $3 million.for the years ended December 31, 2023, 2022, and 2021 are as follows:
202320222021
(in millions)
Southern Company
Compensation cost recognized in income$107 $101 $112 
Tax benefit of compensation cost recognized in income28 26 29 
Southern Company Gas
Compensation cost recognized in income$14 $12 $17 
Tax benefit of compensation cost recognized in income4 
Total PSU compensation cost and the related tax benefit recognized in income were immaterial for all periods presented for all other Registrants. The compensation cost related to the grant of Southern Company performance share unitsPSUs to the Company's employees of each Subsidiary Registrant is recognized in the Company'seach Subsidiary Registrant's financial statements with a corresponding credit to equity representing a capital contribution from Southern Company. As
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At December 31, 2017, $6 million of2023, Southern Company's total unrecognized compensation cost related to performance share award units willPSUs was $32 million and is expected to be recognized over a weighted-average period of approximately 2119 months.
Restricted Stock Units
Stock-based compensation granted to employees included restricted stock units in addition to performance share units. One-third of the restricted stock units granted to employees vest each year throughout a three-year service period. All unvested restricted stock units vest immediately upon a change in control where Southern Company is not the surviving corporation. Shares of Southern Company common stock are delivered to employees at the end of the vesting period.
The fair value of restricted stock units is based on the closing stock price of Southern Company common stock on the date of the grant. Since one-third of the restricted stock units vest each year throughout a three-year service period, compensation expense for restricted stock unit awards is generally recognized over the corresponding one-, two-, or three-year period. Employees become immediately vested in the restricted stock units upon retirement. As a result, compensation expense for employees that are retirement eligible at the grant date is recognized immediately while compensation expense for employees that become retirement eligible during the vesting period is recognized over the period from grant date to the date of retirement eligibility.
For the year ended December 31, 2017, employees of the Company were granted 0.1 million restricted stock units. The weighted average grant-date fair value of restricted stock units granted during 2017 was $49.23.
For the year ended December 31, 2017, total compensation cost for restricted stock units recognized in income was $4 million with the related tax benefit also recognized in income of $2 million. The compensation cost related to the grant of Southern Company restricted stock units to the Company's employees is recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. As of December 31, 2017, $1 million of total unrecognized compensation cost related to restricted stock units will be recognized over a weighted-average period of approximately 13 months.
Merger Stock Compensation
At the effective time of the Merger, each share of Southern Company Gas common stock, other than certain excluded shares, was converted into the right to receive $66 in cash, without interest. AlsoPSUs at the effective time of the Merger:
Southern Company Gas' outstanding restricted stock units, restricted stock awards, and non-employee director stock awards were deemed fully vested and were canceled and converted into the right to receive an amount in cash equal to the product of (i) the total number of shares of Southern Company Gas' common stock subject to such award and (ii) the Merger consideration of $66 per share;
Southern Company Gas' outstanding stock options, all of which were fully vested, were canceled and converted into the right to receive an amount in cash equal to the product of (i) the total number of shares of Southern Company Gas' common stock subject to such options and (ii) the excess of the Merger consideration of $66 per share over the applicable exercise price per share of such options; and
each outstanding award of a performance share unit was converted into an award of Southern Company's restricted stock units (restricted stock awards).
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


In conjunction with the Merger, stock-based compensation, in the form of Southern Company restricted stock and performance share units, was granted to certain executives of the Company through the Southern Company Omnibus Incentive Compensation Plan.
Southern Company Restricted Stock Awards
Under the terms of the restricted stock awards, the employees received a specified number of restricted stock units that vest when the employees have satisfied the requisite service period(s) at which time the employee receives Southern Company common stock. The terms of the award require the employee to be continuously employed through the original three-year vesting schedule of the award being replaced.
For the successor period ended December 31, 2016, employees of the Company were granted 0.7 million restricted stock units. The grant-date fair value of the restricted stock units granted2023 was $53.83, based on the closing stock price of Southern Company common stock on the date of the grant. As a portion of the fair value of the award related to pre-combination service, the grant date fair value was allocated to pre- or post-combination service and accountedimmaterial for as Merger consideration or compensation cost, respectively. Approximately $13 million of the grant date fair value was allocated to Merger consideration. The remaining fair value of $12 million is being recognized as compensation expense on a straight-line basis over the remaining vesting period.
The compensation cost related to the grant of restricted stock units to the Company's employees are recognized in the Company's financial statements with a corresponding credit to equity, representing a capital contribution from Southern Company. For the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016, total compensation cost for restricted stock units recognized in income was $8 million and $13 million, respectively, with the related tax benefit also recognized in income of $4 million and $4 million, respectively. As of December 31, 2017, $3 million of total unrecognized compensation cost related to restricted stock units will be recognized over a weighted-average period of approximately 12 months. See "Performance Share Unit Awards" herein for additional information.
Change in Control Awards
Southern Company awarded performance share units to certain employees remaining with the Company in lieu of certain change in control benefits the employee was entitled to receive following the Merger (change-in-control awards). Shares of Southern Company common stock and/or cash equal to the dollar value of the change-in-control benefit will vest and be issued one-third each year as long as the employee remains in service with the Company, or any of its affiliates, at each vest date. In addition to the change-in-control benefit, Southern Company common stock could be issued to the employees at the end of a performance period with the number of shares issued ranging from 0% to 100% of the target number of performance share units granted, based on achievement of certain Southern Company common stock price metrics, as well as performance goals established by the Compensation Committee of the Southern Company Board of Directors (achievement shares).
The change-in-control benefits are accounted for as a liability award with the fair value equal to the guaranteed dollar value of the change-in-control benefit. The grant-date fair value of the achievement portion of the award was determined using a Monte Carlo simulation model to estimate the number of achievement shares expected to vest based on the Southern Company common stock price. The expected payout is reevaluated annually with expense recognized to date increased or decreased proportionately based on the expected performance. The compensation expense ultimately recognized for the achievement shares will be based on the actual performance.
For the successor year ended December 31, 2017 and the successor period of July 1, 2016 through December 31, 2016, total compensation cost for the change-in-control awards recognized in income was $12 million and $4 million, respectively, with $6 million and less than $1 million, respectively, of related tax benefit recognized in income. The compensation cost related to the grant of Southern Company change-in-control benefit and achievement shares to the Company's employees are recognized in the Company's financial statements with a corresponding credit to a liability or equity, representing a capital contribution from Southern Company, respectively. As of December 31, 2017, $8 million of total unrecognized compensation cost related to change in control awards will be recognized over a weighted-average period of approximately 18 months.
Predecessor
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, the employees of Southern Company Gas and subsidiaries participated in the AGL Resources Inc. Omnibus Performance Incentive Plan, as amended and restated.
The AGL Resources Inc. Omnibus Performance Incentive Plan, as amended and restated, and the Long-Term Incentive Plan (1999) provided for the grant of incentive and nonqualified stock options, stock appreciation rights, shares of restricted stock, restricted stock units, performance cash awards, andall other stock-based awards to officers and key employees. Effective July 1, 2016, all Southern Company Gas shares of stock were canceled and/or converted as a result of the Merger. No further grants willRegistrants.
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


be made from the Long-Term Incentive Plan (1999) or the AGL Resources Inc. Omnibus Performance Incentive Plan, as amended and restated.
For the predecessor periods, the Company recognized stock-based compensation expense for its stock-based awards over the requisite service period based on the estimated fair value at the date of grant for its stock-based awards using the modified prospective method. These stock awards included: stock options, stock and restricted stock awards, and performance units (restricted stock units, performance share units, and performance cash units).
Performance-based stock awards and performance units contained market and performance conditions. Stock options, restricted stock awards, and performance units also contained a service condition. The Company estimated forfeitures over the requisite service period when recognizing compensation expense. These estimates were adjusted to the extent that actual forfeitures differ, or were expected to materially differ, from such estimates. Excess tax benefits were reported as a financing cash inflow. The difference between the proceeds from the exercise of the Company's stock-based awards and the par value of the stock was recorded within additional paid-in capital.
Southern Company Gas granted stock awards with a grant price that was equal to the fair market value on the date of the grant. Fair market value was defined under the terms of the applicable plans as the closing price per share of Southern Company Gas' common stock on the grant date. For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, total compensation cost for cash and stock-based awards recognized in income was $24 million and $40 million, respectively, with related tax benefits also recognized in income, which were immaterial.
Incentive and Nonqualified Stock Options
The stock options that the Company granted prior to the Merger had a three-year vesting period and expired ten years after the date of grant. The exercise price for stock options granted equaled the stock price of Southern Company Gas common stock on the date of grant. Participants realized value from option grants only to the extent that the fair market value of the Company's common stock on the date of exercise of the option exceeded the fair market value of the common stock on the date of the grant. No stock options have been issued under the plan since 2009.
The Company measured compensation cost related to stock options based on the fair value of these awards at their date of grant using the Black-Scholes option-pricing model. For the predecessor year ended December 31, 2015, the Company had no unrecognized compensation costs related to stock options. For the predecessor period ended June 30, 2016 and the year ended December 31, 2015, cash received from stock option exercises and the related income tax benefits were immaterial.
For the predecessor periods of January 1, 2016 through June 30, 2016 and the year ended December 31, 2015, the total intrinsic value of options exercised was $3 million, and $13 million, respectively.
Effective July 1, 2016, all of the Company's outstanding stock options, all of which were fully vested, were canceled and converted into the right to receive an amount in cash equal to the product of (i) the total number of shares of Southern Company Gas' common stock subject to such options and (ii) the excess of the Merger consideration of $66 per share over the applicable exercise price per share of such options.
Restricted Stock Units
A restrictedThe fair value of RSUs is based on the closing stock unit is an award that representsprice of Southern Company common stock on the opportunity to receive a specified number of sharesdate of the Company'sgrant. The weighted average grant-date fair values of RSUs granted during 2023, 2022, and 2021 were $68.95, $67.20, and $59.56, respectively. For most RSU awards, one-third of the RSUs vest each year throughout a three-year service period and compensation cost for RSUs is generally recognized over the corresponding one-, two-, or three-year vesting period. Shares of Southern Company common stock subjectare delivered to employees at the achievementend of certain pre-established performance criteria. each vesting period.
Southern Company had 0.9 million RSUs outstanding at December 31, 2022. During 2023, Southern Company granted 0.5 million RSUs and 0.5 million RSUs were vested or forfeited, resulting in 0.9 million unvested RSUs outstanding at December 31, 2023, including RSUs related to employee retention agreements.
For the predecessor period of January 1, 2016 through June 30, 2016 and the yearyears ended December 31, 2015,2023, 2022, and 2021, Southern Company's total compensation cost for RSUs recognized in income was $30 million, $26 million, and $32 million, respectively. The related tax benefit also recognized in income was $8 million, $7 million, and $8 million for the Company granted 25,166years ended December 31, 2023, 2022, and 47,546, respectively,2021, respectively. Total unrecognized compensation cost related to RSUs at December 31, 2023, which is being recognized over a weighted-average period of restricted stock units (including dividends) to certain employees. Atapproximately 17 months, is immaterial for Southern Company.
Total RSUs outstanding and total compensation cost and related tax benefit for the effective time ofRSUs recognized in income for the Merger,years ended December 31, 2023, 2022, and 2021, as well as the total unrecognized compensation cost at December 31, 2023, were immaterial for all restricted stock units outstanding were deemed fully vested and were canceled and converted into the right to receive an amount in cash equalother Registrants. The compensation cost related to the product of (i) the total number of sharesgrant of Southern Company Gas' common stock subject to such award and (ii) the Merger consideration of $66 per share.
Performance Share Unit Awards
A performance share unit award represented the opportunity to receive cash and shares subjectRSUs to the achievementemployees of certain pre-established performance criteria. Foreach Subsidiary Registrant is recognized in such Subsidiary Registrant's financial statements with a corresponding credit to equity representing a capital contribution from Southern Company.
Stock Options
In 2015, Southern Company discontinued granting stock options. As of December 31, 2017, all stock option awards were vested and compensation cost fully recognized. Stock options expire no later than 10 years after the predecessor periods of January 1, 2016 through June 30, 2016grant date and the yearlatest possible exercise will occur by November 2024. At December 31, 2023, the weighted average remaining contractual term for the options outstanding and exercisable was approximately 2 months.
Southern Company's activity in the stock option program for 2023 is summarized below:
Shares Subject to OptionWeighted Average Exercise Price
(in millions)
Outstanding at December 31, 20221.0 $42.22 
Exercised0.7 42.54 
Outstanding and Exercisable at December 31, 20230.3 $41.58 
Southern Company's cash receipts from issuances related to stock options exercised under the share-based payment arrangements for the years ended December 31, 2015,2023, 2022, and 2021 were $28 million, $75 million, and $66 million, respectively.
At December 31, 2023, the aggregate intrinsic value for options outstanding and exercisable was immaterial for all Registrants.
Total intrinsic value of options exercised, and the related tax benefit, for the years ended December 31, 2023, 2022, and 2021 are presented below for Southern Company granted performance share unit awards to certain officers. The Company's 2016 and 2015 performance share units had two performance measures. One measure, which accountedwere immaterial for 75%, related to the Company's total shareholder return relative to a group of peer companies. The second measure, which accounted for 25%, related to the Company's earnings per share, excluding wholesale gas services, over the three-year performance period.all other Registrants:
Year Ended December 31202320222021
(in millions)
Southern Company
Intrinsic value of options exercised$18 $49 $34 
Tax benefit of options exercised4 12 
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At the effective time of the Merger, each outstanding performance share unit was converted into an award of Southern Company's restricted stock units. The conversion ratio was the product of (i) the greater of (a) 125% of the number of units underlying such award based on target level achievement of all relevant performance goals and (b) the number of units underlying such award based on the actual level of achievement of all relevant performance goals against target and (ii) an exchange ratio based on the Merger consideration of $66 per share as compared to the volume-weighted average price per share of Southern Company common stock. The resulting Southern Company restricted stock units will follow the vesting schedule and payment terms, and otherwise be issued on similar terms and conditions, as were applicable to such pre-Merger performance share unit awards, subject to certain exceptions. See "Southern Company Restricted Stock Awards" for additional information.
Stock and Restricted Stock Awards
The compensation cost of both stock awards and restricted stock awards was equal to the grant date fair value of the awards, recognized over the requisite service period. No other assumptions were used to value the awards. The Company referred to restricted stock as an award of Company common stock subject to time-based vesting or achievement of performance measures. Prior to vesting, restricted stock awards were subject to certain transfer restrictions and forfeiture upon termination of employment.
Restricted Stock AwardsEmployees
Total unvested restricted stock awards outstanding as of December 31, 2015 totaled 0.4 million. During 2016, 0.3 million restricted stock awards were granted, 0.7 million restricted stock awards were vested or forfeited. At the effective time of the Merger, Southern Company Gas' outstanding restricted stock awards were deemed fully vested and were canceled and converted into the right to receive an amount in cash equal to the product of (i) the total number of shares of Southern Company Gas' common stock subject to such award and (ii) the Merger consideration of $66 per share.
9.13. FAIR VALUE MEASUREMENTS
Fair value measurements are based on inputs of observable and unobservable market data that a market participant would use in pricing the asset or liability. The use of observable inputs is maximized where available and the use of unobservable inputs is minimized for fair value measurement and reflects a three-tier fair value hierarchy that prioritizes inputs to valuation techniques used for fair value measurement. See Note
Level 1 under "Fair Value Measurements"consists of observable market data in an active market for additional information onidentical assets or liabilities.
Level 2 consists of observable market data, other than that included in Level 1, that is either directly or indirectly observable.
Level 3 consists of unobservable market data. The input may reflect the assumptions of each Registrant of what a market participant would use in pricing an asset or liability. If there is little available market data, then each Registrant's own assumptions are the best available information.
In the case of multiple inputs being used in a fair value measurement, the lowest level input that is significant to the fair value hierarchy.measurement represents the level in the fair value hierarchy in which the fair value measurement is reported.
AsNet asset value as a practical expedient is the classification used for assets that do not have readily determined fair values. Fund managers value the assets using various inputs and techniques depending on the nature of the underlying investments.

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At December 31, 2017,2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Energy-related derivatives(a)
$$49 $— $— $55 
Investments in trusts:(b)
Domestic equity764 216 — — 980 
Foreign equity145 171 — — 316 
U.S. Treasury and government agency securities— 369 — — 369 
Municipal bonds— 48 — — 48 
Pooled funds – fixed income— — — 
Corporate bonds— 389 — — 389 
Mortgage and asset backed securities— 89 — — 89 
Private equity— — — 169 169 
Cash and cash equivalents— — — 
Other58 — 70 
Cash equivalents and restricted cash253 15 — — 268 
Other investments27 — 44 
Total$1,238 $1,382 $$178 $2,806 
Liabilities:
Energy-related derivatives(a)
$46 $312 $— $— $358 
Interest rate derivatives— 264 — — 264 
Foreign currency derivatives— 122 — — 122 
Contingent consideration— 16 — 19 
Other— 13 — — 13 
Total$49 $711 $16 $— $776 
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 Fair Value Measurements Using  
As of December 31, 2017:Quoted Prices in Active Markets for Identical Assets
(Level 1)
 Significant Other Observable Inputs
(Level 2)
 Significant Unobservable Inputs
(Level 3)
 Net Asset Value as a Practical Expedient (NAV) Total
 (in millions)
Assets:         
Energy-related derivatives(a)(b)
$331
 $223
 $
 $
 $554
Liabilities:         
Energy-related derivatives(a)(b)
$479
 $181
 $
 $
 $660
(a)Energy-related derivatives excludes $11 million associated with premiums and certain weather derivatives accounted for based on intrinsic value rather than fair value.
(b)Energy-related derivatives excludes cash collateral of $193 million.

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Southern Company Gas and Subsidiary Companies 2017 Annual Report



Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Alabama Power
Assets:
Energy-related derivatives$— $15 $— $— $15 
Nuclear decommissioning trusts:(b)
Domestic equity443 208 — — 651 
Foreign equity145 — — — 145 
U.S. Treasury and government agency securities— 20 — — 20 
Municipal bonds— — — 
Corporate bonds— 231 — — 231 
Mortgage and asset backed securities— 25 — — 25 
Private equity— — — 169 169 
Other— — 17 
Cash equivalents and restricted cash119 15 — — 134 
Other investments— 27 — — 27 
Total$715 $542 $— $178 $1,435 
Liabilities:
Energy-related derivatives$— $110 $— $— $110 
Georgia Power
Assets:
Energy-related derivatives$— $13 $— $— $13 
Nuclear decommissioning trusts:(b)
Domestic equity321 — — 322 
Foreign equity— 170 — — 170 
U.S. Treasury and government agency securities— 349 — — 349 
Municipal bonds— 47 — — 47 
Corporate bonds— 158 — — 158 
Mortgage and asset backed securities— 64 — — 64 
Other50 — — 53 
Total$371 $805 $— $— $1,176 
Liabilities:
Energy-related derivatives$— $124 $— $— $124 
As
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical Assets Significant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2023:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Mississippi Power
Assets:
Energy-related derivatives$— $15 $— $— $15 
Cash equivalents17 — — — 17 
Total$17 $15 $— $— $32 
Liabilities:
Energy-related derivatives$— $61 $— $— $61 
Southern Power
Assets:
Energy-related derivatives$— $$— $— $
Liabilities:
Energy-related derivatives$— $$— $— $
Foreign currency derivatives— 22 — — 22 
Contingent consideration— 16 — 19 
Other— 13 — — 13 
Total$$40 $16 $— $59 
Southern Company Gas
Assets:
Energy-related derivatives(a)
$$$— $— $
Non-qualified deferred compensation trusts:
Domestic equity— — — 
Foreign equity— — — 
Pooled funds - fixed income— — — 
Cash and cash equivalents— — — 
Total$$17 $— $— $26 
Liabilities:
Energy-related derivatives(a)(b)
$46 $12 $— $— $58 
Interest rate derivatives— 79 — — 79 
Total$46 $91 $— $— $137 
(a)Excludes cash collateral of $62 million.
(b)Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information.
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At December 31, 2016,2022, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows:
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Southern Company
Assets:
Energy-related derivatives(a)
$18 $181 $— $— $199 
Interest rate derivatives— 12 — — 12 
Investments in trusts:(b)(c)
Domestic equity651 178 — — 829 
Foreign equity125 150 — — 275 
U.S. Treasury and government agency securities— 285 — — 285 
Municipal bonds— 51 — — 51 
Pooled funds – fixed income— — — 
Corporate bonds— 412 — — 412 
Mortgage and asset backed securities— 90 — — 90 
Private equity— — — 161 161 
Cash and cash equivalents— — — 
Other37 12 — — 49 
Cash equivalents1,427 20 — — 1,447 
Other investments26 — — 35 
Total$2,271 $1,424 $— $161 $3,856 
Liabilities:
Energy-related derivatives(a)
$32 $178 $— $— $210 
Interest rate derivatives— 302 — — 302 
Foreign currency derivatives— 216 — — 216 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$32 $709 $12 $— $753 
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 Fair Value Measurements Using  
As of December 31, 2016:Quoted Prices in Active Markets for Identical Assets
(Level 1)
 Significant Other Observable Inputs
(Level 2)
 Significant Unobservable Inputs
(Level 3)
 Net Asset Value as a Practical Expedient (NAV) Total
 (in millions)
Assets:         
Energy-related derivatives(a)(b)
$338
 $239
 $
 $
 $577
Liabilities:         
Energy-related derivatives(a)(b)
$345
 $224
 $
 $
 $569
Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Alabama Power
Assets:
Energy-related derivatives$— $62 $— $— $62 
Nuclear decommissioning trusts:(b)
Domestic equity396 169 — — 565 
Foreign equity125 — — — 125 
U.S. Treasury and government agency securities— 19 — — 19 
Municipal bonds— — — 
Corporate bonds— 225 — — 225 
Mortgage and asset backed securities— 22 — — 22 
Private equity— — — 161 161 
Other— — — 
Cash equivalents438 20 — — 458 
Other investments— 26 — — 26 
Total$966 $544 $— $161 $1,671 
Liabilities:
Energy-related derivatives$— $39 $— $— $39 
Georgia Power
Assets:
Energy-related derivatives$— $42 $— $— $42 
Nuclear decommissioning trusts:(b)(c)
Domestic equity255 — — 256 
Foreign equity— 149 — — 149 
U.S. Treasury and government agency securities— 266 — — 266 
Municipal bonds— 50 — — 50 
Corporate bonds— 187 — — 187 
Mortgage and asset backed securities— 68 — — 68 
Other30 12 — — 42 
Cash equivalents355 — — — 355 
Total$640 $775 $— $— $1,415 
Liabilities:
Energy-related derivatives$— $62 $— $— $62 
(a)Energy-related derivatives excludes $4 million associated with certain weather derivatives accounted for based on intrinsic value rather than fair value.
(b)Energy-related derivatives excludes cash collateral of $62 million.
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Fair Value Measurements Using
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable InputsNet Asset Value as a Practical Expedient
At December 31, 2022:(Level 1)(Level 2)(Level 3)(NAV)Total
(in millions)
Mississippi Power
Assets:
Energy-related derivatives$— $59 $— $— $59 
Cash equivalents47 — — — 47 
Total$47 $59 $— $— $106 
Liabilities:
Energy-related derivatives$— $32 $— $— $32 
Southern Power
Assets:
Energy-related derivatives$— $$— $— $
Liabilities:
Energy-related derivatives$— $12 $— $— $12 
Foreign currency derivatives— 47 — — 47 
Contingent consideration— — 12 — 12 
Other— 13 — — 13 
Total$— $72 $12 $— $84 
Southern Company Gas
Assets:
Energy-related derivatives(a)
$18 $10 $— $— $28 
Non-qualified deferred compensation trusts:
Domestic equity— — — 
Foreign equity— — — 
Pooled funds - fixed income— — — 
Cash equivalents— — — 
Cash equivalents50 — — — 50 
Total$72 $26 $— $— $98 
Liabilities:
Energy-related derivatives(a)(b)
$32 $33 $— $— $65 
Interest rate derivatives— 86 — — 86 
Total$32 $119 $— $— $151 
(a)Excludes cash collateral of $41 million.
(b)Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 under "Nuclear Decommissioning" for additional information.
(c)Includes investment securities pledged to creditors and collateral received and excludes payables related to the securities lending program. See Note 6 under "Nuclear Decommissioning" for additional information.
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Valuation Methodologies
The energy-related derivatives primarily consist of exchange-traded and over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard OTCover-the-counter products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The fair value of cross-currency swaps reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future foreign currency exchange rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note 1014 for additional information on how these derivatives are used.
DebtFor fair value measurements of the investments within the nuclear decommissioning trusts and the non-qualified deferred compensation trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available.
The Company's long-term debtNRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. See Note 6 under "Nuclear Decommissioning" for additional information.
Southern Power has contingent payment obligations related to two of its acquisitions whereby it is recordedprimarily obligated to make generation-based payments to the seller, commencing at amortized cost, includingthe commercial operation of each facility and continuing through 2026 and 2035, respectively. The obligations are primarily categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facility's generation in MW-hours, as well as other inputs such as a fixed dollar amount per MW-hour, and a discount rate. The fair value of contingent consideration reflects the net present value of expected payments and any periodic change arising from forecasted generation is expected to be immaterial.
Southern Power also has payment obligations through 2040 whereby it must reimburse the transmission owners for interconnection facilities and network upgrades constructed to support connection of a Southern Power generating facility to the transmission system. The obligations are categorized as Level 2 under Fair Value Measurements as the fair value is determined using observable inputs for the contracted amounts and reimbursement period, as well as a discount rate. The fair value of the obligations reflects the net present value of expected payments.
"Other investments" primarily includes investments traded in the open market that have maturities greater than 90 days, which are categorized as Level 2 under Fair Value Measurements and are comprised of corporate bonds, bank certificates of deposit, treasury bonds, and/or agency bonds.
The fair value measurements of private market investments held in Alabama Power's nuclear decommissioning trusts that are calculated at net asset value per share (or its equivalent) as a practical expedient totaled $178 million and $161 million at December 31, 2023 and 2022, respectively. Unfunded commitments related to the private market investments totaled $87 million and $78 million at December 31, 2023 and 2022, respectively. Private market investments include high-quality private equity funds across several market sectors, funds that invest in real estate assets, and a private credit fund. Private market funds do not have redemption rights. Distributions from these funds will be received as the underlying investments in the funds are liquidated.
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At December 31, 2023 and 2022, other financial instruments for which the carrying amount did not equal fair value were as follows:
Southern
  Company(*)
Alabama PowerGeorgia PowerMississippi PowerSouthern Power
Southern Company
 Gas(*)
(in billions)
At December 31, 2023:
Long-term debt, including securities due within one year:
Carrying amount$59.4 $11.2 $16.5 $1.6 $2.7 $7.8 
Fair value55.0 10.1 15.1 1.4 2.6 6.8 
At December 31, 2022:
Long-term debt, including securities due within one year:
Carrying amount$54.6 $10.6 $14.7 $1.5 $3.0 $7.4 
Fair value48.6 9.2 13.0 1.3 2.8 6.5 
(*)The carrying amount of Southern Company Gas' long-term debt includes fair value adjustments atfrom the effective date of the Merger. The2016 merger with Southern Company. Southern Company Gas amortizes the fair value adjustments over the remaining lives of the respective bonds. The following table presentsbonds, the carrying amount and fair value of the Company's long-term debt as of December 31:
 Carrying Amount Fair Value
 (in millions)
Long-term debt, including securities due within one year:   
2017$6,048
 $6,471
2016$5,281
 $5,491
latest being through 2043.
The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on the current rates available to the Company.Registrants.
10.14. DERIVATIVES
The Company isRegistrants are exposed to market risks, primarilyincluding commodity price risk, interest rate risk, weather risk, and weatheroccasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, the Companyeach company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to the Company'seach company's policies in areas such as counterparty exposure and risk management practices. Wholesale gas operations use various contracts in its commercial activities that generally meetFor the definition of derivatives. Fortraditional electric operating companies, Southern Power, and Southern Company Gas' other businesses, the Company'seach company's policy is that derivatives are to be used primarily for hedging purposes. In both cases, the Companypurposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note 913 for additional fair value information. In the statements of cash flows, theany cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities. Any cash impacts of settled foreign currency derivatives are classified as operating or financing activities to correspond with the classification of the hedged interest or principal, respectively. See Note 1 under "Financial Instruments" for additional information. See Note 15 under "Southern Company Gas" for additional information regarding the sale of Sequent.
Energy-Related Derivatives
The Company entersSubsidiary Registrants enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution operations hasutilities have limited exposure to market volatility in pricesenergy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas. Thegas distribution utilities of Southern Company managesGas manage fuel-hedging programs, implemented per the guidelines of the natural gas

NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


distribution utilities'their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which isare expected to continue to mitigate price volatility. The traditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because their long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, the traditional electric operating companies and Southern Power may be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, be extremely material and can adversely affect the Company.its results of operations.
TheSouthern Company Gas also enters into weather derivative contracts as economic hedges of adjusted operating margins in the event of warmer-than-normal weather. Exchange-traded options are carried at fair value, with changes reflected in operating revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are reflected in the statementsoperating revenues.
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Energy-related derivative contracts are accounted for under one of three methods:
Regulatory Hedges Energy-related derivative contracts which are designated as regulatory hedges relate primarily to the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in the cost of natural gasfuel expense as the underlying natural gasfuel is used in operations and ultimately recovered through the respectivean approved cost recovery clauses.
mechanism.
Cash Flow Hedges Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales) are initially deferred in other OCIAOCI before being recognized in the statements of income in the same period and in the same income statement line item as the earnings effect of the hedged transactions are reflected in earnings.
transactions.
Not Designated Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income in the period of change.
as incurred.
Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric and natural gas industry.industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered.
At December 31, 2017,2023, the net volume of energy-related derivative contracts for natural gas positions, totaled 300 million mmBtu for the Company, together with the longest hedge date of 2020 over which the Companyrespective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date of 2026 for derivatives not designated as hedges.hedges, were as follows:
Net
Purchased
mmBtu
Longest
Hedge
Date
Longest
Non-Hedge
Date
(in millions)
Southern Company(*)
44820302028
Alabama Power1182026
Georgia Power1282026
Mississippi Power932028
Southern Power720302024
Southern Company Gas(*)
10220272028
(*)Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of long natural gas positions of 112 million mmBtu and short natural gas positions of 10 million mmBtu at December 31, 2023, which is also included in Southern Company's total volume.
In addition to the volumes discussed above, the traditional electric operating companies and Southern Power enter into physical natural gas supply contracts that provide the option to sell back excess natural gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 12 million mmBtu for Southern Company, which includes 3 million mmBtu for Alabama Power, 4 million mmBtu for Georgia Power, 2 million mmBtu for Mississippi Power, and 3 million mmBtu for Southern Power.
For cash flow hedges of energy-related derivatives, the estimated pre-tax losses that willgains (losses) expected to be reclassified from accumulated OCIAOCI to earnings for the 12-month periodyear ending December 31, 20182024 are $4 million.$(37) million for Southern Company, $(4) million for Southern Power, and $(33) million for Southern Company Gas.
Interest Rate Derivatives
TheSouthern Company and certain subsidiaries may also enter into interest rate derivatives to hedge exposure to changes in interest rates. The derivatives employed as hedging instruments are structured to minimize ineffectiveness. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the effective portion of the derivatives' fair value gains or losses isare recorded in OCI and isare reclassified into earnings at the same time and presented on the same income statement line item as the earnings effect of the hedged transactions affect earnings, with any ineffectiveness recorded directly to earnings.transactions. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings providing an offset, with any difference representing ineffectiveness.on the same income statement line item. Fair value gains or losses on derivatives that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred.
In 2015,
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At December 31, 2023, the Company executed $800 million in notional value of 10-year and 30-year fixed-rate forward-startingfollowing interest rate swapsderivatives were outstanding:
Notional
Amount
Weighted Average Interest Rate PaidInterest
Rate
Received
Hedge
Maturity
Date
Fair Value
Gain (Loss) December 31, 2023
(in millions)(in millions)
Cash Flow Hedges of Forecasted Debt
Georgia Power$150 4.01%N/AApril 2024$— 
Mississippi Power75 3.84%N/AJune 2024— 
Mississippi Power75 4.04%N/AJune 2024— 
Fair Value Hedges of Existing Debt
Southern Company parent400 1-month SOFR + 0.80%1.75%March 2028(46)
Southern Company parent1,000 1-month SOFR + 2.48%3.70%April 2030(139)
Southern Company Gas500 1-month SOFR + 0.49%1.75%January 2031(79)
Southern Company$2,200 $(264)
For cash flow hedges of interest rate derivatives, the estimated pre-tax losses expected to be reclassified from AOCI to interest expense for the year ending December 31, 2024 are $19 million for Southern Company and immaterial for the traditional electric operating companies and Southern Company Gas. Deferred gains and losses related to interest rate derivatives are expected to be amortized into earnings through 2054 for Southern Company, Georgia Power, and Mississippi Power, 2052 for Alabama Power, and 2046 for Southern Company Gas.
Foreign Currency Derivatives
Southern Company and certain subsidiaries, including Southern Power, may enter into foreign currency derivatives to hedge potential interest rate volatility designatedexposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and on the same income statement line as the earnings effect of issuances of long-term debtthe hedged transactions, including foreign currency gains or losses arising from changes in the fourth quarter 2015U.S. currency exchange rates. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and during 2016. Thehedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Southern Company settled $200 millionhas elected to exclude the cross-currency basis spread from the assessment of these interest rate swapseffectiveness in 2015 for an immaterial loss, $400 millionthe fair value hedges of its foreign currency risk and record any difference between the change in May 2016 at a lossthe fair value of $26 million,the excluded components and the remaining $200amounts recognized in earnings as a component of OCI.
At December 31, 2023, the following foreign currency derivatives were outstanding:
Pay NotionalPay RateReceive NotionalReceive RateHedge
Maturity Date
Fair Value
Gain (Loss) December 31, 2023
(in millions)(in millions) (in millions)
Cash Flow Hedges of Existing Debt
Southern Power$564 3.78%500 1.85%June 2026$(22)
Fair Value Hedges of Existing Debt
Southern Company parent1,476 3.39%1,250 1.88%September 2027(100)
Southern Company$2,040 1,750 $(122)
For cash flow hedges of foreign currency derivatives, the estimated pre-tax losses expected to be reclassified from AOCI to earnings for the year ending December 31, 2024 are $11 million in September 2016 at a lossfor Southern Power.
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Table of $35 million. DueContentsIndex to the application of acquisition accounting, only $5 million of the pre-tax loss incurred and deferred in the successor period is being amortized to interest expense through 2046.Financial Statements

COMBINED NOTES TO FINANCIAL STATEMENTS

Derivative Financial Statement Presentation and Amounts
The Registrants enter into derivative contracts of the Company are subject to master netting arrangements or similar agreements and are reported net in the financial statements. Some of these energy-related and interest rate derivative contractsthat may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements.

NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Reportcertain subsidiaries also utilize master netting agreements to mitigate exposure to counterparty credit risk. These agreements may contain provisions that permit netting across product lines and against cash collateral. The fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.


At December 31, 2017 and 2016, theThe fair value of energy-related derivatives, and interest rate derivatives, and foreign currency derivatives was reflected in the balance sheets as follows:
20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Southern Company
Energy-related derivatives designated as hedging instruments for regulatory purposes
Assets from risk management activities/Liabilities from risk management activities$12 $198 $123 $121 
Other deferred charges and assets/Other deferred credits and liabilities31 117 52 44 
Total derivatives designated as hedging instruments for regulatory purposes43 315 175 165 
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Assets from risk management activities/Liabilities from risk management activities 29 27 
Other deferred charges and assets/Other deferred credits and liabilities3 4 
Interest rate derivatives:
Assets from risk management activities/Liabilities from risk management activities 74 12 62 
Other deferred charges and assets/Other deferred credits and liabilities 190 — 240 
Foreign currency derivatives:
Assets from risk management activities/Liabilities from risk management activities 34 — 34 
Other deferred charges and assets/Other deferred credits and liabilities 88 — 182 
Total derivatives designated as hedging instruments in cash flow and fair value hedges3 419 21 549 
Energy-related derivatives not designated as hedging instruments
Assets from risk management activities/Liabilities from risk management activities8 8 13 13 
Other deferred charges and assets/Other deferred credits and liabilities1 2 
Total derivatives not designated as hedging instruments9 10 15 14 
Gross amounts recognized55 744 211 728 
Gross amounts offset(a)
(23)(85)(70)(111)
Net amounts recognized in the Balance Sheets(b)
$32 $659 $141 $617 
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 20172016
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
 (in millions)(in millions)
Derivatives designated as hedging instruments for regulatory purposes    
Energy-related derivatives:    
Assets from risk management activities/Liabilities from risk management activities-current$5
$8
$24
$3
Other deferred charges and assets/Other deferred credits and liabilities

1

Total derivatives designated as hedging instruments for regulatory purposes$5
$8
$25
$3
Derivatives designated as hedging instruments in cash flow and fair value hedges    
Energy-related derivatives:    
Assets from risk management activities/Liabilities from risk management activities-current$
$3
$4
$3
Derivatives not designated as hedging instruments    
Energy-related derivatives:    
Assets from risk management activities/Liabilities from risk management activities-current$379
$434
$486
$482
Other deferred charges and assets/Other deferred credits and liabilities170
215
66
81
Total derivatives not designated as hedging instruments$549
$649
$552
$563
Gross amounts recognized$554
$660
$581
$569
Gross amounts offset(a)
$(390)$(583)$(435)$(497)
Net amounts recognized in the Balance Sheets (b)
$164
$77
$146
$72
20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Alabama Power(c)
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$6 $69 $42 $21 
Other deferred charges and assets/Other deferred credits and liabilities9 41 20 18 
Total derivatives designated as hedging instruments for regulatory purposes15 110 62 39 
Gross amounts offset(10)(10)(24)(24)
Net amounts recognized in the Balance Sheets$5 $100 $38 $15 
Georgia Power
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$2 $82 $36 $43 
Other deferred charges and assets/Other deferred credits and liabilities10 42 18 
Total derivatives designated as hedging instruments for regulatory purposes12 124 42 61 
Energy-related derivatives not designated as hedging instruments
Other deferred charges and assets/Other deferred credits and liabilities1   
Gross amounts recognized13 124 42 62 
Gross amounts offset(11)(11)(21)(21)
Net amounts recognized in the Balance Sheets$2 $113 $21 $41 
Mississippi Power(c)
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$3 $27 $33 $24 
Other deferred charges and assets/Other deferred credits and liabilities12 34 26 
Total derivatives designated as hedging instruments for regulatory purposes15 61 59 32 
Gross amounts offset(14)(14)(17)(17)
Net amounts recognized in the Balance Sheets$1 $47 $42 $15 
(a)Gross amounts offset include cash collateral held on deposit in broker margin accounts of $193 million and $62 million as of December 31, 2017 and 2016, respectively.
(b)Net amount of derivative instruments outstanding excludes premiums and intrinsic value associated with weather derivatives of $11 million as of December 31, 2017.
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20232022
Derivative Category and Balance Sheet LocationAssetsLiabilitiesAssetsLiabilities
(in millions)
Southern Power
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Other current assets/Other current liabilities$ $5 $— $12 
Other deferred charges and assets/Other deferred credits and liabilities3  — 
Foreign currency derivatives:
Other current assets/Other current liabilities 11 — 11 
Other deferred charges and assets/Other deferred credits and liabilities 11 — 36 
Total derivatives designated as hedging instruments in cash flow and fair value hedges3 27 59 
Energy-related derivatives not designated as hedging instruments
Other current assets/Other current liabilities  — 
Other deferred charges and assets/Other deferred credits and liabilities  — 
Total derivatives not designated as hedging instruments  — 
Net amounts recognized in the Balance Sheets$3 $27 $$59 
Southern Company Gas
Energy-related derivatives designated as hedging instruments for regulatory purposes
Other current assets/Other current liabilities$1 $20 $12 $33 
Derivatives designated as hedging instruments in cash flow and fair value hedges
Energy-related derivatives:
Other current assets/Other current liabilities 24 15 
Other deferred charges and assets/Other deferred credits and liabilities 4 
Interest rate derivatives:
Other current assets/Other current liabilities 20 — 14 
Other deferred charges and assets/Other deferred credits and liabilities 59 — 72 
Total derivatives designated as hedging instruments in cash flow and fair value hedges 107 105 
Energy-related derivatives not designated as hedging instruments
Other current assets/Other current liabilities7 8 11 12 
Other deferred charges and assets/Other deferred credits and liabilities1 2 
Total derivatives not designated as hedging instruments8 10 12 13 
Gross amounts recognized9 137 28 151 
Gross amounts offset(a)
12 (50)— (41)
Net amounts recognized in the Balance Sheets(b)
$21 $87 $28 $110 
(a)Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $62 million and $41 million at December 31, 2023 and 2022, respectively.
(b)Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for all periods presented.
(c)Energy-related derivatives not designated as hedging instruments were immaterial at December 31, 2022. There were no such instruments at December 31, 2023.
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At December 31, 20172023 and 2016,2022, the pre-tax effecteffects of unrealized derivative gains (losses) arising from energy-related derivativesderivative instruments designated as regulatory hedging instruments and deferred were as follows:
Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheets
Derivative Category and Balance Sheet
Location
Southern
Company
Alabama
Power
Georgia
Power
Mississippi
Power
Southern Company Gas
 (in millions)
At December 31, 2023:
Energy-related derivatives:
Other regulatory assets, current$(180)$(67)$(80)$(25)$(8)
Other regulatory assets, deferred(87)(32)(33)(22)— 
Other regulatory liabilities, current— 
Other regulatory liabilities, deferred— — — 
Total energy-related derivative gains (losses)$(257)$(95)$(112)$(46)$(4)
At December 31, 2022:
Energy-related derivatives:
Other regulatory assets, current$(71)$(8)$(26)$(13)$(24)
Other regulatory assets, deferred(23)(7)(14)(2)— 
Other regulatory liabilities, current72 29 19 22 
Other regulatory liabilities, deferred31 20 — 
Total energy-related derivative gains (losses)$$23 $(19)$27 $(22)
  Unrealized Losses Unrealized Gains
Derivative CategoryBalance Sheet Location20172016Balance Sheet Location20172016
  (in millions) (in millions)
Energy-related derivatives:     
 Other regulatory assets, current$(4)$(1)Other regulatory liabilities, current$7
$17
 Other regulatory assets, deferred

Other regulatory liabilities, deferred
1
Total energy-related derivative gains (losses)(*)
$(4)$(1) $7
$18
(*) Fair value gains and losses included in regulatory assets and liabilities include cash collateral held on deposit in broker margin accounts of $6 million as ofFor the years ended December 31, 20172023, 2022, and $8 million2021, the pre-tax effects of cash flow and fair value hedge accounting on AOCI for the applicable Registrants were as follows:
Gain (Loss) From Derivatives Recognized in OCI202320222021
(in millions)
Southern Company
Cash flow hedges:
Energy-related derivatives$(81)$$34 
Interest rate derivatives(12)46 
Foreign currency derivatives14 (105)(103)
Fair value hedges(*):
Foreign currency derivatives21 (24)(3)
Total$(58)$(80)$(67)
Georgia Power
Cash flow hedges:
Interest rate derivatives$(2)$31 $— 
Southern Power
Cash flow hedges:
Energy-related derivatives$(18)$(15)$12 
Foreign currency derivatives14 (105)(103)
Total$(4)$(120)$(91)
Southern Company Gas
Cash flow hedges:
Energy-related derivatives$(63)$18 $22 
(*)Represents amounts excluded from the assessment of December 31, 2016.effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report



For all periods presented, theThe pre-tax effecteffects of energy-related derivatives and interest rate derivatives designated as cash flow hedging instruments recognizedon AOCI were immaterial for Alabama Power for all years presented and immaterial for Mississippi Power in OCI2023.
The pre-tax effects of cash flow and those reclassified from accumulated OCI into earningsfair value hedge accounting on income for the years ended December 31, 2023, 2022, and 2021 were as follows:
Location and Amount of Gain (Loss) Recognized in Income on Cash Flow and Fair Value Hedging Relationships202320222021
(in millions)
Southern Company
Total cost of natural gas$1,644 $3,004 $1,619 
Gain (loss) on energy-related cash flow hedges(a)
(44)37 17 
Total other operations and maintenance6,093 6,573 5,902 
Gain (loss) on energy-related cash flow hedges(a)
(2)  
Total depreciation and amortization4,525 3,663 3,565 
Gain (loss) on energy-related cash flow hedges(a)
(23)(5)
Total interest expense, net of amounts capitalized(2,446)(2,022)(1,837)
Gain (loss) on interest rate cash flow hedges(a)
(35)(25)(27)
Gain (loss) on foreign currency cash flow hedges(a)
(11)(19)(24)
Gain (loss) on interest rate fair value hedges(b)
37 (291)(30)
Total other income (expense), net553 500 449 
Gain (loss) on foreign currency cash flow hedges(a)(c)
19 (83)(104)
Gain (loss) on foreign currency fair value hedges69 (106)(63)
Amount excluded from effectiveness testing recognized in earnings(21)24 
Southern Power
Total depreciation and amortization$504 $516 $517 
Gain (loss) on energy-related cash flow hedges(a)
(23)(5)
Total interest expense, net of amounts capitalized(129)(138)(147)
Gain (loss) on foreign currency cash flow hedges(a)
(11)(19)(24)
Total other income (expense), net12 7 10 
Gain (loss) on foreign currency cash flow hedges(a)(c)
19 (83)(104)
Southern Company Gas
Total cost of natural gas$1,644 $3,004 $1,619 
Gain (loss) on energy-related cash flow hedges(a)
(44)37 17 
Total other operations and maintenance1,194 1,176 1,072 
Gain (loss) on energy-related cash flow hedges(a)
(2)  
Total interest expense, net of amounts capitalized(310)(263)(238)
Gain (loss) on interest rate cash flow hedges(a)
(19)(4)— 
Gain (loss) on interest rate fair value hedges(b)
(86)— 
 
Gain (Loss) Recognized in OCI on Derivative
(Effective Portion)
 
Gain (Loss) Reclassified from Accumulated OCI into Income
(Effective Portion)
 Successor Successor
Derivatives in Cash Flow Hedging Relationships2017Statements of Income Location2017
 (in millions) (in millions)
Energy-related derivatives$(9)Cost of natural gas$(2)
(a)Reclassified from AOCI into earnings.
 
Gain (Loss) Recognized in OCI on Derivative
 (Effective Portion)
  Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
 Successor  Predecessor  Successor  Predecessor
Derivatives in Cash Flow Hedging RelationshipsJuly 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 Statements of Income LocationJuly 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016
 (in millions)  (in millions)  (in millions)  (in millions)
Energy-related derivatives$2
  $
 Cost of natural gas$(1)  $(1)
Interest rate derivatives(5)  (64) Interest expense, net of amounts capitalized
  
Total derivatives in cash flow hedging relationships$(3)  $(64)  $(1)  $(1)
 Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 
Gain (Loss) Reclassified from Accumulated OCI into Income
(Effective Portion)
 Predecessor Predecessor
Derivatives in Cash Flow Hedging Relationships2015Statements of Income Location2015
 (in millions) (in millions)
Energy-related derivatives$3
Cost of natural gas$(10)
  Other operations and maintenance(1)
Interest rate derivatives
Interest expense, net of amounts capitalized2
Total derivatives in cash flow hedging relationships$3
 $(9)
There was(b)For fair value hedges, changes in the fair value of the derivative contracts are generally equal to changes in the fair value of the underlying debt and have no material ineffectiveness recordedimpact on income.
(c)The reclassification from AOCI into other income (expense), net completely offsets currency gains and losses arising from changes in earningsthe U.S. currency exchange rates used to record the euro-denominated notes.
The pre-tax effects of cash flow hedge accounting on income for any periodinterest rate derivatives were immaterial for the traditional electric operating companies for all years presented.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report



At December 31, 2023 and 2022, the following amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges:
For all periods presented, the
Carrying Amount of
the Hedged Item
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item
Balance Sheet Location of Hedged ItemsAt December 31, 2023At December 31, 2022At December 31, 2023At December 31, 2022
(in millions)(in millions)
Southern Company
Long-term debt$(3,024)$(2,927)$235 $282 
Southern Company Gas
Long-term debt$(427)$(415)$70 $81 
The pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income of Southern Company and Southern Company Gas for the years ended December 31, 2023, 2022, and 2021 were as follows:
Gain (Loss)Gain (Loss)
Derivatives in Non-Designated Hedging RelationshipsDerivatives in Non-Designated Hedging RelationshipsStatements of Income Location202320222021
(in millions)(in millions)
Energy-related derivatives
Energy-related derivatives
Energy-related derivatives
Cost of natural gas
Total derivatives in non-designated hedging relationships
Total derivatives in non-designated hedging relationships
Total derivatives in non-designated hedging relationships
 Gain (Loss)
 Successor  Predecessor
Derivatives in Non-Designated Hedging RelationshipsStatements of Income LocationYear Ended December 31, 2017July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016Year Ended December 31, 2015
 (in millions)  (in millions)
Energy-related derivatives
Natural gas revenues(*)
$(80)$33
  $(1)$56
Cost of natural gas(2)3
  (62)(6)
Total derivatives in non-designated hedging relationships$(82)$36
  $(63)$50
(*)Excludes the impact of weather derivatives recorded in natural gas revenues of $23 million for the successor year ended December 31, 2017, $6 million for the successor period of July 1, 2016 through December 31, 2016, $3 million for the predecessor period of January 1, 2016 through June 30, 2016, and $12 million for the predecessor year ended December 31, 2015.
(*)    Excludes the impact of weather derivatives recorded in natural gas revenues of $15 million and $(7) million for 2023 and 2022, respectively, as they are accounted for based on intrinsic value rather than fair value. There was no weather derivatives impact for 2021.
The pre-tax effects of energy-related derivatives not designated as hedging instruments were immaterial for all other Registrants for all years presented.
Contingent Features
The Company doesRegistrants do not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of avarious credit rating change below BBB- and/changes of certain Southern Company subsidiaries. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or Baa3.cash. At December 31, 2017,2023, the CompanyRegistrants had no collateral posted with derivative counterparties to satisfy these arrangements.
At December 31, 2017,For Southern Company, the fair value of foreign currency derivative liabilities and interest rate derivative liabilities with contingent features, was $3 million and the maximum potential collateral requirements arising from the credit-risk-related contingent features at a rating below BBB- and/or Baa3, was $2$52 million at December 31, 2023. For Southern Power, the fair value of foreign currency derivative liabilities with contingent features, and the maximum potential collateral requirements arising from the credit-risk-related contingent features at a rating below BBB- and/or Baa3, was immaterial at December 31, 2023. For the traditional electric operating companies and Southern Power, energy-related derivative liabilities with contingent features and the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were immaterial at December 31, 2023. The maximum potential collateral requirements arising from the credit-risk-related contingent features for the traditional electric operating companies and Southern Power include certain agreements that could require collateral in the event that one or more Southern Company power pool participants has a credit rating change to below investment grade.
Alabama Power and Southern Power maintain accounts with certain regional transmission organizations to facilitate financial derivative transactions and they may be required to post collateral based on the value of the positions in these accounts and the associated margin requirements. At December 31, 2023, cash collateral posted in these accounts was immaterial for Alabama Power and Southern Power. Southern Company Gas maintains accounts with brokers or the clearing houses of certain exchanges to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, Southern Company Gas may be required to deposit cash into these accounts. At December 31, 2023, cash collateral held on deposit in broker margin accounts was $62 million.
Generally, collateral may be provided by a guaranty, letter
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Table of credit, or cash. If collateral is required, fair value amounts recognized for the rightContentsIndex to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty.Financial Statements

COMBINED NOTES TO FINANCIAL STATEMENTS

The Company isRegistrants are exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Company hasRegistrants only enter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Registrants have also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate the Company'stheir exposure to counterparty credit risk.
Southern Company Gas uses established credit policies to determine and monitor the creditworthiness of counterparties, including requirements to post collateral or other credit security, as well as the quality of pledged collateral. Collateral or credit security is most often in the form of cash or letters of credit from an investment-grade financial institution, but may also include cash or U.S. government securities held by a trustee. Prior to entering into a physical transaction, theSouthern Company Gas assigns physical wholesaleits counterparties an internal credit rating and credit limit based on the counterparties' Moody's, S&P, and Fitch ratings, commercially available credit reports, and audited financial statements. TheSouthern Company Gas may require counterparties to pledge additional collateral when deemed necessary. Credit evaluations are conducted and appropriate internal approvals are obtained for a counterparty's line of credit before any transaction with the counterparty is executed. In most cases, the counterparty must have an investment grade rating, which includes a minimum long-term debt rating of Baa3 from Moody's and BBB- from S&P. Generally, the
Southern Company requires credit enhancements by way of a guaranty, cash deposit, or letter of credit for transaction counterparties that do not have investment grade ratings.
The Company alsoGas utilizes master netting agreements whenever possible to mitigate exposure to counterparty credit risk. When the Company is engaged in more than one outstanding derivative transaction with the same counterparty and it also has a legally enforceable netting agreement with that counterparty, the "net" mark-to-market exposure represents the netting of the positive and negative exposures with that counterparty and a reasonable measure of the Company's credit risk. The Company also uses other netting agreements with certain counterparties with whom it conducts significant transactions. Master nettingNetting agreements enable theSouthern Company Gas to net certain assets and liabilities by counterparty. The Company also netscounterparty across product lines and against cash collateral, provided the master netting and cash collateral agreements include such provisions. While the amounts due from, or owed to, counterparties are settled net, they are recorded on a gross basis on the balance sheet as energy marketing receivables and energy marketing payables.
The Company may require counterparties to pledge additional collateral when deemed necessary. Therefore, the Company doesRegistrants do not anticipate a material adverse effect on thetheir respective financial statements as a result of counterparty nonperformance.
15. ACQUISITIONS AND DISPOSITIONS
None of the dispositions discussed herein, both individually and combined, represented a strategic shift in operations for the applicable Registrants that has, or is expected to have, a major effect on its operations and financial results; therefore, none of the assets related to the sales have been classified as discontinued operations for any of the periods presented.
Southern Company
In October 2021, Southern Company completed the sale of a leveraged lease investment to the lessee for $45 million. No gain or loss was recognized on the sale; however, it did result in the recognition of approximately $16 million of additional tax benefits. Prior to the sale, in the second quarter 2021, a charge of $7 million ($6 million after tax) was recorded to reduce the investment to its estimated fair value, less costs to sell.
In December 2021, Southern Company completed the termination of its leasehold interest in assets associated with its two international leveraged lease projects and received cash proceeds of approximately $673 million after the accelerated exercise of the lessee's purchase options. The pre-tax gain associated with the transaction was approximately $93 million ($99 million gain after tax).
Alabama Power
In September 2022, Alabama Power completed its acquisition of the Calhoun Generating Station, which was accounted for as an asset acquisition. The total purchase price was $179 million, of which $171 million was related to net assets recorded within property, plant, and equipment on the balance sheet and reflected in property additions within the investing section of the statement of cash flows. The remainder primarily related to fossil fuel stock and materials and supplies. See Note 2 under "Alabama Power – Rate CNP New Plant" for additional information.
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Southern Company GasPower
Southern Power's acquisition-related costs for the projects discussed under "Asset Acquisitions" and Subsidiary Companies 2017 Annual Report


11. MERGER, ACQUISITION, AND DISPOSITIONS
Merger with Southern Company
On July 1, 2016, the Company completed the Merger with Southern Company. A wholly-owned, direct subsidiary of Southern Company merged with and into Southern Company Gas, with the Company surviving as a wholly-owned, direct subsidiary of Southern Company.
At the effective time"Construction Projects" were not material for any of the Merger, each share ofyears presented. There were no asset acquisitions during 2022.
Asset Acquisitions
Project
Facility
ResourceSeller
Approximate Nameplate Capacity (MW)
LocationSouthern
Power
Ownership
Percentage
Expected/Actual CODPPA
Contract Period
Asset Acquisitions During 2023
Millers Branch(a)
Solar
EDF Renewables
Development, Inc.
200Haskell County, TX100%Fourth quarter 202520 years
South CheyenneSolarHanwha Q Cells USA Corp.150Laramie County, WY100%Second quarter 202420 years
Asset Acquisitions During 2021
Deuel Harvest(b)
WindInvenergy Renewables LLC300Deuel County, SD100% of Class BFebruary 2021
25 years
and
15 years
(a)The project includes an option to expand capacity up to an additional 300 MWs. Subsequent to December 31, 2023, Southern Company Gas common stock, other than certain excluded shares, was converted intoPower committed to expand the right to receive $66 in cash, without interest. Also at the effective timeconstruction of the Merger, allfacility through a second phase adding up to 205 MWs, with commercial operation expected to occur in the second quarter 2026.
(b)In March 2021, Southern Power acquired a controlling interest in the project from Invenergy Renewables LLC and completed a tax equity transaction whereby it sold the Class A membership interests in the project. Southern Power consolidates the project's operating results in its financial statements and the tax equity partner and Invenergy Renewables LLC each own a noncontrolling interest.
The aggregate purchase price for the two projects acquired during 2023 was $193 million, which is primarily recorded within construction work in progress on the balance sheet at December 31, 2023.
Construction Projects
Project
Facility
Resource
Approximate Nameplate Capacity (MW)
LocationCODPPA Contract Period
Projects Completed During 2022
Garland Solar Storage(a)
Battery energy storage88Kern County, CA
September 2021 through February 2022(b)
20 years
Tranquillity Solar Storage(a)
Battery energy storage72Fresno County, CA
November 2021 through
March 2022(c)
20 years
Projects Completed During 2021
Glass Sands(d)
Wind118Murray County, OKNovember 202112 years
(a)In 2020, Southern Power restructured its ownership of the outstanding restricted stock units, restricted stock awards, non-employee director stock awards, stock options,project, while retaining the controlling interests, by contributing the Class A membership interests to an existing partnership and performance share units were either redeemed or converted intoselling 100% of the Class B membership interests. During 2021, Southern Company's restricted stock units.Power further restructured its ownership in the battery energy storage projects and completed tax equity transactions whereby it sold the Class A membership interests in the projects. Southern Power consolidates each project's operating results in its financial statements and the tax equity partner and two other partners each own a noncontrolling interest. See Note 89 under "Lessor" for additional information.
(b)The applicationfacility has a total capacity of 88 MWs, of which 73 MWs were placed in service in 2021 and 15 MWs were placed in service in 2022.
(c)The facility has a total capacity of 72 MWs, of which 32 MWs were placed in service in 2021 and 40 MWs were placed in service in 2022.
(d)In December 2020, Southern Power purchased 100% of the acquisition method of accounting was pushed down to the Company. The excessmembership interests of the purchase price over the fair valuesGlass Sands facility.
Development Projects
Southern Power purchased wind turbine equipment in 2016 and 2017 for deployment to development and construction projects. All of the Company's assets and liabilities was recorded as goodwill, which represents a different basis of accounting from the historical basis priorthis equipment has either been deployed to the Merger. The following table presents the final purchase price allocation:projects that have been completed or has been sold to third parties. Gains on wind turbine equipment contributed to various equity method investments totaled approximately $37 million in 2021.
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 Successor  Predecessor  
 New Basis  Old Basis Change in Basis
 (in millions)  (in millions)
Current assets$1,557
  $1,474
 $83
Property, plant, and equipment10,108
  10,148
 (40)
Goodwill5,967
  1,813
 4,154
Other intangible assets400
  101
 299
Regulatory assets1,118
  679
 439
Other assets229
  273
 (44)
Current liabilities(2,201)  (2,205) 4
Other liabilities(4,742)  (4,600) (142)
Long-term debt(4,261)  (3,709) (552)
Contingently redeemable noncontrolling interest(174)  (41) (133)
Total purchase price/equity$8,001
  $3,933
 $4,068
Measurement period adjustments were recorded to the purchase price allocation during the fourth quarter 2016, which resulted in a net $30 million increase in goodwill to establish intangible liabilities for transportation contracts at wholesale services, partially offset by adjustments to deferred tax balances.
In determining the fair value of assets and liabilities subject to rate regulation that allows recovery of costs and/or a fair return on investments, historical cost was deemed to be a reasonable proxy for fair value, as it is included in rate base or otherwise specified in regulatory recovery mechanisms. Property, plant, and equipment subject to rate regulation was reflected based on the historical gross amount of assets in service and accumulated depreciation, as they are included in rate base. For certain assets and liabilities subject to rate regulation (such as debt instruments and employee benefit obligations), the fair value adjustment was applied to historical cost with a corresponding offset to regulatory asset or liability based on the assessment of probable future recovery in rates.
For unregulated assets and liabilities, fair value adjustments were applied to historical cost of natural gas for sale, property, plant, and equipment, debt instruments, and noncontrolling interest. The valuation of other intangible assets included customer relationships, trade names, and favorable/unfavorable contracts. The valuation of these assets and liabilities applied either the market approach or income approach. The market approach was utilized when prices and other relevant market information were available. The income approach, which is based on discounted cash flows, was primarily based on significant unobservable inputs (Level 3). Key estimates and inputs included forecasted profitability and cash flows, customer retention rates, royalty rates, and discount rates.
The estimated fair value of deferred income taxes was determined by applying the appropriate enacted statutory tax rate to the temporary differences that arose on the differences between the financial reporting value and tax basis of the assets acquired and liabilities assumed.

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Southern Company Gas and Subsidiary Companies 2017 Annual Report

Sale of Sequent

The excess of the purchase price over the estimated fair value of assets and liabilities of $6 billion was recognized as goodwill, which is primarily attributable to positioningIn July 2021, Southern Company to provide natural gas infrastructure to meet customers' growing energy needs and to compete for growth across the energy value chain. The Company anticipates that the majority of the value assigned to goodwill will not be deductible for tax purposes.
The receipt of required regulatory approvals was conditioned upon certain terms and commitments. In connection with these regulatory approvals, certain regulatory agencies prohibited the Company from recovering goodwill and Merger-related expenses, required the Company to maintain a minimum number of employees for a set period of time to ensure that certain pipeline safety standards and the competence level of the employee workforce is not degraded, and/or required the Company to maintain its pre-Merger level of support for various social and charitable programs. The most notable terms and commitments with potential financial impacts included:
rate credits of $18 million to be paid to customers in New Jersey and Maryland;
sharing of Merger savings with customers in Georgia starting in 2020;
phasing-out the use of the Nicor name or logo by certain of the Company's gas marketing services subsidiaries in conducting non-utility business in Illinois;
reaffirming that Elizabethtown Gas would file a base rate case no later than September 1, 2016, with another base rate case no later than three years after the 2016 rate case; and
requiring Elkton Gas to file a base rate case within two years of closing the Merger.
There is no restriction on the Company's other utilities' ability to file future rate cases. The rate credits to customers in New Jersey and Maryland were paid during the third and fourth quarters of 2016, respectively. The use of the Nicor name and logo was phased out, effective November 1, 2017, by certain of the Company's gas marketing services subsidiaries in conducting non-utility business in Illinois. Elizabethtown Gas filed a base rate case with the New Jersey BPU on September 1, 2016. See Note 3 under "Base Rate Cases" for additional information. Upon completion of the Merger, the Company amended and restated its Bylaws and Articles of Incorporation, under which it now has the authority to issue no more than 110 million shares of stock consisting of (i) 100 million shares of common stock and (ii) 10 million shares of preferred stock, both categories of which have a par value of $0.01 per share. The amended and restated Articles of Incorporation do not allow any treasury shares to be held.
Investment in SNG
In September 2016, the Company, through a wholly-owned, indirect subsidiary, acquired a 50% equity interest in SNG pursuant to a definitive agreement between Southern Company and Kinder Morgan, Inc. in July 2016, to which Southern Company assigned all rights and obligations to the Company in August 2016. SNG owns a 7,000-mile pipeline system connecting natural gas supply basins in Texas, Louisiana, Mississippi, and Alabama to markets in Louisiana, Mississippi, Alabama, Florida, Georgia, South Carolina, and Tennessee. The purchase price of $1.4 billion was financed by a $1.05 billion equity contribution from Southern Company and $360 million of cash paid by the Company, which was financed by a promissory note from Southern Company repaid with a portion of the proceeds from senior notes issued in September 2016. The purchase price of the 50% equity interest exceeded the underlying ownership interest in the net assets of SNG by approximately $700 million. This basis difference is attributable to goodwill and deferred tax assets. While the deferred tax assets will be amortized through deferred tax expense, the goodwill will not be amortized and is not required to be tested for impairment on an annual basis. The Company's investment in SNG decreased by $104 million related to the impact of the Tax Reform Legislation and new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings.
On March 31, 2017, the Company made an additional $50 million contribution to maintain its 50% equity interest in SNG. See Note 4 under "Equity Method Investments" for additional information on this investment.
Proposed Sale of Elizabethtown Gas and Elkton Gas
On October 15, 2017, the Company's subsidiary, Pivotal Utility Holdings, entered into agreements foraffiliates completed the sale of the assets of two of its natural gas distribution utilities, Elizabethtown Gas and Elkton Gas,Sequent to South Jersey Industries, Inc.Williams Field Services Group for a total cash purchase price of $1.7 billion.$159 million, including final working capital adjustments. The completionpre-tax gain associated with the transaction was approximately $121 million ($92 million after tax). The sale resulted in $85 million of each assetadditional tax expense.
Sale of Natural Gas Storage Facilities
In September 2022, certain affiliates of Southern Company Gas entered into agreements to sell two natural gas storage facilities located in California and Texas for an aggregate purchase price of$186 million, plus working capital and certain other adjustments. The sale isof the Texas facility was completed in November 2022 and the sale of the California facility was completed on September 22, 2023. Both sales resulted in an immaterial loss. Completion of the sale of the Texas facility was subject to release of a Southern Company Gas parent guarantee, which was executed in October 2022 and, as a result, Southern Company Gas recorded pre-tax impairment charges totaling approximately $131 million ($99 million after tax) in the satisfaction or waiverfourth quarter 2022.
16. SEGMENT AND RELATED INFORMATION
Southern Company
Southern Company's reportable business segments are the sale of electricity by the traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. Revenues from sales by Southern Power to the traditional electric operating companies were $537 million, $875 million, and $515 million in 2023, 2022, and 2021, respectively. Revenues from sales of natural gas from Southern Company Gas to the traditional electric operating companies were immaterial for all periods presented. Revenues from sales of natural gas from Southern Company Gas (prior to its sale of Sequent) to Southern Power were $18 million in 2021. The "All Other" column includes the Southern Company parent entity, which does not allocate operating expenses to business segments. Also, this category includes segments below the quantitative threshold for separate disclosure. These segments include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications. All other inter-segment revenues are not material.
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Financial data for business segments and products and services for the years ended December 31, 2023, 2022, and 2021 was as follows:
Electric Utilities
Traditional
Electric
Operating
Companies
Southern
Power
EliminationsTotalSouthern Company GasAll
Other
EliminationsConsolidated
(in millions)
2023
Operating revenues$18,358 $2,189 $(549)$19,998 $4,702 $718 $(165)$25,253 
Depreciation and amortization3,361 504  3,865 582 78  4,525 
Interest income69 7  76 9 26 (26)85 
Earnings from equity method investments(1)  (1)140 5  144 
Interest expense1,145 129  1,274 310 879 (17)2,446 
Income taxes (benefit)571 12  583 211 (298) 496 
Segment net income (loss)(a)(b)(c)(d)
3,637 357  3,994 615 (635)2 3,976 
Goodwill 2  2 5,015 144  5,161 
Total assets100,429 12,761 (545)112,645 25,083 2,446 (843)139,331 
2022
Operating revenues$20,408 $3,369 $(904)$22,873 $5,962 $593 $(149)$29,279 
Depreciation and amortization2,513 516 — 3,029 559 75 — 3,663 
Interest income44 — 47 16 (7)59 
Earnings from equity method investments— — — — 148 — 151 
Interest expense929 138 — 1,067 263 694 (2)2,022 
Income taxes (benefit)828 20 — 848 180 (233)— 795 
Segment net income (loss)(a)(b)(e)(f)
3,318 354 — 3,672 572 (711)(9)3,524 
Goodwill— — 5,015 144 — 5,161 
Total assets95,861 13,081 (659)108,283 24,621 2,665 (678)134,891 
2021
Operating revenues$16,614 $2,216 $(530)$18,300 $4,380 $582 $(149)$23,113 
Depreciation and amortization2,436 517 — 2,953 536 76 — 3,565 
Interest income20 — 21 — (3)22 
Earnings from equity method investments— — 50 24 76 
Interest expense821 147 — 968 238 631 — 1,837 
Income taxes (benefit)232 (13)— 219 275 (227)— 267 
Segment net income (loss)(a)(b)(g)(h)(i)
1,981 266 — 2,247 539 (384)(9)2,393 
Goodwill— — 5,015 263 — 5,280 
Total assets89,051 13,390 (667)101,774 23,560 2,975 (775)127,534 
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(a)Attributable to Southern Company.
(b)For the traditional electric operating companies, includes pre-tax charges (credits) to income at Georgia Power for the estimated probable loss associated with the construction of Plant Vogtle Units 3 and 4 of $(68) million ($(50) million after tax) in 2023, $183 million ($137 million after tax) in 2022, and $1.7 billion ($1.3 billion after tax) in 2021. See Note 2 under "Georgia Power – Nuclear Construction" for additional information.
(c)For Southern Power, includes an $18 million pre-tax loss recovery ($9 million after tax and partnership allocations) related to an arbitration award and a $16 million pre-tax gain ($12 million after tax) on the sale of spare parts. See Note 3 under "General Litigation Matters – Southern Power" for additional information.
(d)For Southern Company Gas, includes pre-tax charges totaling approximately $96 million ($72 million after tax) associated with the disallowance of certain conditions, including, among other customary closing conditions, the receipt of required regulatory approvals, including the FERC, the Federal Communications Commission, the New Jersey BPU, and, with respectcapital investments at Nicor Gas. See Note 2 under "Southern Company Gas" for additional information.
(e)For Southern Company Gas, includes pre-tax impairment charges totaling approximately $131 million ($99 million after tax) related to the sale of Elktonnatural gas storage facilities. See Note 15 under "Southern Company Gas" for additional information.
(f)For the "All Other" column, includes a $119 million goodwill impairment loss (pre-tax and after tax) at PowerSecure. See Note 1 under "Goodwill and Other Intangible Assets" for additional information.
(g)For Southern Power, includes gains on wind turbine equipment contributed to various equity method investments totaling approximately $37 million pre-tax ($28 million after tax). See Notes 7 and 15 under "Southern Power" for additional information.
(h)For Southern Company Gas, includes a pre-tax gain of $121 million ($92 million after tax) related to its sale of Sequent, as well as the Maryland PSC. Theresulting $85 million of additional tax expense due to changes in state apportionment rates, and pre-tax impairment charges totaling $84 million ($67 million after tax) related to its equity method investment in the PennEast Pipeline project. See Notes 7 and 15 under "Southern Company and South Jersey Industries, Inc. made joint filings on December 22, 2017 and January 16, 2018Gas" for additional information.
(i)For the "All Other" column, includes a pre-tax gain of $93 million ($99 million gain after tax) associated with the New Jersey BPUtermination of two leveraged leases projects. See Note 15 under "Southern Company" for additional information.
Products and the Maryland PSC, respectively, requesting regulatory approval. The asset sales are expected to be completed by the end of the third quarter 2018.Services
The ultimate outcome of these matters cannot be determined at this time.
Electric Utilities' Revenues
YearRetailWholesaleOtherTotal
(in millions)
2023$16,343 $2,467 $1,188 $19,998 
202218,197 3,641 1,035 22,873 
202114,852 2,455 993 18,300 
Southern Company Gas' Revenues
YearGas
Distribution
Operations
Gas
Marketing
Services
All OtherTotal
(in millions)
2023$4,090 $548 $64 $4,702 
20225,240 638 84 5,962 
20213,656 475 249 4,380 
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Southern Company Gas
Southern Company Gas and Subsidiary Companies 2017 Annual Report


12. SEGMENT AND RELATED INFORMATION
The Company manages its business through fourthree reportable segments - gas distribution operations, gas pipeline investments, and gas marketing services,services. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' reportable segments also included wholesale gas services, and gas midstream operations.services. The non-reportable segments are combined and presented as all other. In conjunction withSee Note 15 under "Southern Company Gas" for additional information on the Merger, the Company changed the names of certain reportable segments to better align with its new parent company.disposition activities described herein.
Gas distribution operations is the largest component of the Company'sSouthern Company Gas' business and includes natural gas local distribution utilities that construct, manage, and maintain intrastate natural gas pipelines and gas distribution facilities in sevenfour states.
Gas marketing services includespipeline investments consists of joint ventures in natural gas marketingpipeline investments including a 50% interest in SNG and a 50% joint ownership interest in the Dalton Pipeline. These natural gas pipelines enable the provision of diverse sources of natural gas supplies to end-usethe customers primarily in Georgiaof Southern Company Gas. See Notes 5 and Illinois. Additionally, gas marketing services provides home equipment protection products and services. Wholesale7 for additional information.
Through July 1, 2021, wholesale gas services providesprovided natural gas asset management and/or related logistics services for each of the Company'sSouthern Company Gas' utilities except Nicor Gas as well as for non-affiliated companies. Additionally, wholesale gas services segment engagesengaged in natural gas storage and gas pipeline arbitrage and related activities. Since the acquisition of the Company's 50% interest
Gas marketing services provides natural gas marketing to end-use customers primarily in SNG, gas midstream operations primarily consists of the Company's gas pipeline investments, with storageGeorgia and fuel operations also aggregated into this segment. Illinois through SouthStar.
The all other column includes segments below the quantitative threshold for separate disclosure, including theand subsidiaries that fall below the quantitative threshold for separate disclosure.
After the Merger, the Company changed the segment performance measure to net income, which is utilized bydisclosure, including storage and fuels operations. The all other column included a natural gas storage facility in Texas through its parent company. In order to properly assess net income by segment, the Company executed various intercompany note agreements to revise interest charges tosale in November 2022 and a natural gas storage facility in California through its segments. Since such agreements did not existsale in the predecessor periods, the Company is unable to provide the comparable net income for those periods.September 2023.
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Southern Company Gas and Subsidiary Companies 2017 Annual Report



Financial data for business segments for the successor yearyears ended December 31, 2017,2023, 2022, and 2021 was as follows:
Gas Distribution OperationsGas Pipeline Investments
Wholesale Gas Services(a)
Gas Marketing ServicesTotalAll OtherEliminationsConsolidated
(in millions)
2023
Operating revenues$4,105 $32 $ $548 $4,685 $36 $(19)$4,702 
Depreciation and amortization561 5  15 581 1  582 
Operating income (loss)804 22  130 956 (4)(13)939 
Earnings from equity method investments 140   140   140 
Interest expense275 32 3 310   310 
Income taxes126 32  37 195 16  211 
Segment net income (loss)(b)
441 98  91 630 (15) 615 
Total assets22,906 1,534  1,615 26,055 9,675 (10,647)25,083 
2022
Operating revenues$5,267 $32 $— $638 $5,937 $55 $(30)$5,962 
Depreciation and amortization516 — 16 537 22 — 559 
Operating income (loss)803 21 — 133 957 (135)(8)814 
Earnings from equity method investments— 148 — — 148 — — 148 
Interest expense229 27 — 259 — 263 
Income taxes (benefit)145 35 — 37 217 (37)— 180 
Segment net income (loss)(c)
470 107 — 94 671 (99)— 572 
Total assets22,040 1,577 — 1,616 25,233 8,943 (9,555)24,621 
2021
Operating revenues$3,679 $32 $188 $475 $4,374 $38 $(32)$4,380 
Depreciation and amortization482 — 18 505 31 — 536 
Operating income (loss)708 21 241 125 1,095 (40)— 1,055 
Earnings from equity method investments— 50 — — 50 — — 50 
Interest expense207 25 237 — 238 
Income taxes120 27 32 34 213 62 — 275 
Segment net income (loss)(d)(e)(f)
412 19 107 88 626 (87)— 539 
Total assets20,917 1,467 31 1,556 23,971 12,114 (12,525)23,560 
(a)As a result of the successor periodsale of July 1, 2016 through December 31, 2016, andSequent, wholesale gas services is no longer a reportable segment in 2023 or 2022. Prior to the predecessor periodssale of January 1, 2016 through June 30, 2016 andSequent, the year ended December 31, 2015 were as follows:
 Gas Distribution Operations Gas Marketing Services 
Wholesale Gas Services(a)
 Gas Midstream Operations Total All Other Eliminations Consolidated
 (in millions)
Successor – Year ended December 31, 2017          
Operating revenues$3,207
 $860
 $6
 $71
 $4,144
 $10
 $(234) $3,920
Depreciation and
amortization
391
 62
 2
 18
 473
 28
 
 501
Operating income (loss)650
 113
 (51) (10) 702
 (37) 
 665
Earnings from equity method investments
 
 
 103
 103
 3
 
 106
Interest expense(153) (5) (7) (33) (198) (2) 
 (200)
Income taxes(b)
178
 24
 
 61
 263
 104
 
 367
Segment net income (loss)(b)
353
 84
 (57) 3
 383
 (140) 
 243
Gross property
additions
1,330
 9
 1
 134
 1,474
 34
 
 1,508
Successor – Total assets
at December 31, 2017
19,358
 2,147
 1,096
 2,241
 24,842
 12,184
 (14,039) 22,987
Successor – July 1, 2016 through December 31, 2016          
Operating revenues$1,342
 $354
 $24
 $31
 $1,751
 $3
 $(102) $1,652
Depreciation and
amortization
185
 35
 1
 9
 230
 8
 
 238
Operating income (loss)222
 27
 (2) (7) 240
 (43) 
 197
Earnings from equity
method investments

 
 
 58
 58
 2
 
 60
Interest expense(105) (1) (3) (16) (125) 44
 
 (81)
Income taxes51
 7
 (3) 16
 71
 5
 
 76
Segment net income (loss)77
 19
 
 20
 116
 (2) 
 114
Gross property
additions
561
 5
 1
 54
 621
 11
 
 632
Successor – Total assets
at December 31, 2016
19,453
 2,084
 1,127
 2,211
 24,875
 11,145
 (14,167) 21,853
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NOTES (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report


 Gas Distribution Operations Gas Marketing Services 
Wholesale Gas Services(a)
 Gas Midstream Operations Total All Other Eliminations Consolidated
 (in millions)
Predecessor – January 1, 2016 through June 30, 2016          
Operating revenues$1,575
 $435
 $(32) $25
 $2,003
 $4
 $(102) $1,905
Depreciation and
 amortization
178
 11
 1
 9
 199
 7
 
 206
Operating income (loss)351
 109
 (69) (9) 382
 (61) 
 321
EBIT353
 109
 (68) (6) 388
 (60) 
 328
Gross property additions484
 4
 1
 43
 532
 16
 
 548
Predecessor – Year Ended December 31, 2015   
     
Operating revenues$3,049
 $835
 $202
 $55
 $4,141
 $11
 $(211) $3,941
Depreciation and
 amortization
336
 25
 1
 18
 380
 17
 
 397
Operating income (loss)571
 152
 112
 (26) 809
 (63) 
 746
EBIT581
 152
 110
 (23) 820
 (59) 
 761
Gross property additions957
 7
 2
 27
 993
 34
 
 1,027
Predecessor – Total
assets at
December 31, 2015
12,519
 686
 935
 692
 14,832
 9,662
 (9,740) 14,754
(a)The revenues for wholesale gas services arewere netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table.
Third Party Gross RevenuesIntercompany RevenuesTotal Gross RevenuesLess Gross Gas CostsOperating Revenues
(in millions)
2021$3,881 $90 $3,971 $3,783 $188 
(b)For gas distribution operations, includes pre-tax charges totaling approximately $96 million ($72 million after tax) associated with the disallowance of certain capital investments at Nicor Gas. See Note 2 under "Southern Company Gas" for additional information.
(c)For the "All Other" column, includes pre-tax impairment charges totaling approximately $131 million ($99 million after tax) related to the sale of natural gas storage facilities. See Note 15 under "Southern Company Gas" for additional information.
(d)For gas pipeline investments, includes pre-tax impairment charges totaling $84 million ($67 million after tax) related to the equity method investment in the PennEast Pipeline project. See Note 7 under "Southern Company Gas" for additional information.
(e)For wholesale gas services, includes a pre-tax gain of $121 million ($92 million after tax) related to the sale of Sequent.
(f)For the "All Other" column, includes $85 million of additional tax expense as a result of the sale of Sequent.

II-254
 Third Party Gross Revenues Intercompany Revenues Total Gross Revenues Less Gross Gas Costs Operating Revenues
 (in millions)
Successor – Year Ended
December 31, 2017
$6,152
 $481
 $6,633
 $6,627
 $6
Successor – July 1, 2016 through
December 31, 2016
5,807
 333
 6,140
 6,116
 24
 (in millions)
Predecessor – January 1, 2016 through
June 30, 2016
$2,500
 $143
 $2,643
 $2,675
 $(32)
Predecessor – Year Ended December 31, 20156,286
 408
 6,694
 6,492
 202
(b)Includes the impact of the Tax Reform Legislation and new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings.

Table of ContentsIndex to Financial Statements

Item 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
NOTES (continued)None.
Item 9A.CONTROLS AND PROCEDURES
Disclosure Controls and Procedures.
As of the end of the period covered by this Annual Report on Form 10-K, Southern Company, Alabama Power, Georgia Power, Mississippi Power, Southern Power, and Southern Company Gas conducted separate evaluations under the supervision and with the participation of each company's management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of the disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended). Based upon these evaluations, the Chief Executive Officer and the Chief Financial Officer, in each case, concluded that the disclosure controls and procedures are effective.
Internal Control Over Financial Reporting.
(a) Management's Annual Report on Internal Control Over Financial Reporting.
Page
II-256
II-257
II-258
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II-260
II-261
(b) Attestation Report of the Registered Public Accounting Firm.
The report of Deloitte & Touche LLP, Southern Company's independent registered public accounting firm, regarding Southern Company's Internal Control over Financial Reporting is included in Item 8 herein of this Form 10-K. This report is not applicable to Alabama Power, Georgia Power, Mississippi Power, Southern Power, and Southern Company Gas as these companies are not accelerated filers or large accelerated filers.
(c) Changes in internal control over financial reporting.
There have been no changes in Southern Company's, Alabama Power's, Georgia Power's, Mississippi Power's, Southern Power's, or Southern Company Gas' internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended) during the fourth quarter 2023 that have materially affected or are reasonably likely to materially affect Southern Company's, Alabama Power's, Georgia Power's, Mississippi Power's, Southern Power's, or Southern Company Gas' internal control over financial reporting.
Item 9B.OTHER INFORMATION
There were no adoptions, modifications, or terminations of "Rule 10b5-1 trading arrangements" or "non-Rule 10b5-1 trading arrangements," as defined in Item 408(a) of Regulation S-K, during the three months ended December 31, 2023 by the Registrants' directors and "officers," as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended.
Item 9C.DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS
Not applicable.
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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Southern Company and Subsidiary Companies
The management of Southern Company is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of Southern Company's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Southern Company's internal control over financial reporting was effective as of December 31, 2023.
Deloitte & Touche LLP, as auditors of Southern Company's financial statements, has issued an attestation report on the effectiveness of Southern Company's internal control over financial reporting as of December 31, 2023, which is included herein.

/s/ Christopher C. Womack
Christopher C. Womack
Chairman, President, and Chief Executive Officer

/s/ Daniel S. Tucker
Daniel S. Tucker
Executive Vice President and Chief Financial Officer
February 14, 2024

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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Alabama Power Company
The management of Alabama Power is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of Alabama Power's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Alabama Power's internal control over financial reporting was effective as of December 31, 2023.

/s/ J. Jeffrey Peoples
J. Jeffrey Peoples
Chairman, President, and Chief Executive Officer

/s/ Moses H. Feagin
Moses H. Feagin
Executive Vice President, Chief Financial Officer, and Treasurer
February 14, 2024

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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Georgia Power Company
The management of Georgia Power is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of Georgia Power's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Georgia Power's internal control over financial reporting was effective as of December 31, 2023.

/s/ Kimberly S. Greene
Kimberly S. Greene
Chairman, President, and Chief Executive Officer

/s/ Aaron P. Abramovitz
Aaron P. Abramovitz
Executive Vice President, Chief Financial Officer, and Treasurer
February 14, 2024

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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Mississippi Power Company
The management of Mississippi Power is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of Mississippi Power's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Mississippi Power's internal control over financial reporting was effective as of December 31, 2023.

/s/ Anthony L. Wilson
Anthony L. Wilson
Chairman, President, and Chief Executive Officer

/s/ Matthew P. Grice
Matthew P. Grice
Vice President, Chief Financial Officer, and Treasurer
February 14, 2024

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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Southern Power Company and Subsidiary Companies
The management of Southern Power is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.
Under management's supervision, an evaluation of the design and effectiveness of Southern Power's internal control over financial reporting was conducted based on the framework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Southern Power's internal control over financial reporting was effective as of December 31, 2023.

/s/ Christopher Cummiskey
Christopher Cummiskey
Chairman and Chief Executive Officer

/s/ Gary Kerr
Gary Kerr
Senior Vice President, Chief Financial Officer, and Treasurer
February 14, 2024

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MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
Southern Company Gas and Subsidiary Companies 2017 Annual Report

The management of Southern Company Gas is responsible for establishing and maintaining an adequate system of internal control over financial reporting as required by the Sarbanes-Oxley Act of 2002 and as defined in Exchange Act Rule 13a-15(f). A control system can provide only reasonable, not absolute, assurance that the objectives of the control system are met.

13. QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Summarized quarterlyUnder management's supervision, an evaluation of the design and effectiveness of Southern Company Gas' internal control over financial information forreporting was conducted based on the successor year endedframework in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Southern Company Gas' internal control over financial reporting was effective as of December 31, 20172023.

/s/ James Y. Kerr II
James Y. Kerr II
Chairman, President, and the successor period of July 1, 2016 through December 31, 2016Chief Executive Officer

/s/ Grace A. Kolvereid
Grace A. Kolvereid
Executive Vice President, Chief Financial Officer, and for the predecessor period of January 1, 2016 through June 30, 2016 are as follows:Treasurer
February 14, 2024
II-261
Quarter EndedOperating
Revenues
 Operating
Income (Loss)
 EBIT Net Income (Loss) Attributable to Southern Company Gas
 (in millions)
Successor - 2017       
March 2017$1,560
 $391
 $435
 $239
June 2017716
 96
 128
 49
September 2017(a)
565
 68
 118
 15
December 2017(a)(b)
1,079
 110
 129
 (60)
Predecessor - January 1, 2016 through June 30, 2016(in millions)
March 2016$1,334
 $348
 $351
 $182
June 2016571
 (27) (23) (51)
Successor - July 1, 2016 through December 31, 2016(in millions)
September 2016$543
 $12
 $50
 $4
December 20161,109
 185
 221
 110
(a)Net income (loss) attributable to Southern Company Gas includes the impact of new income tax apportionment factors in several states resulting from the Company's inclusion in the consolidated Southern Company state tax filings.
(b)Net loss attributable to Southern Company Gas includes the impact of the Tax Reform Legislation.
The Company's business is influenced by seasonal weather conditions.
See Note 11 under "Merger with Southern Company" for information on the Merger.

Table of ContentsIndex to Financial Statements

SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA 2013-2017
Southern Company Gas and Subsidiary Companies 2017 Annual Report

 Successor  Predecessor
 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 2015 2014 2013
Operating Revenues (in millions)$3,920
 $1,652
  $1,905
 $3,941
 $5,385
 $4,209
Net Income Attributable to
Southern Company Gas
(in millions)
$243
 $114
  $131
 $353
 $482
 $295
Cash Dividends on Common Stock
(in millions)
$443
 $126
  $128
 $244
 $233
 $222
Return on Average Common Equity
(percent)
2.68
 1.74
  3.31
 9.05
 12.96
 8.42
Total Assets (in millions)$22,987
 $21,853
  $14,488
 $14,754
 $14,888
 $14,528
Gross Property Additions
(in millions)
$1,525
 $632
  $548
 $1,027
 $769
 $731
Capitalization (in millions):            
Common stock equity$9,022
 $9,109
  $3,933
 $3,975
 $3,828
 $3,613
Long-term debt5,891
 5,259
  3,709
 3,275
 3,581
 3,791
Total (excluding amounts due within
one year)
$14,913
 $14,368
  $7,642
 $7,250
 $7,409
 $7,404
Capitalization Ratios (percent):            
Common stock equity60.5
 63.4
  51.5
 54.8
 51.7
 48.8
Long-term debt39.5
 36.6
  48.5
 45.2
 48.3
 51.2
Total (excluding amounts due within
one year)
100.0
 100.0
  100.0
 100.0
 100.0
 100.0
Service Contracts (period-end)1,184,257
 1,198,263
  1,197,096
 1,205,476
 1,162,065
 1,176,908
Customers (period-end)            
Gas distribution operations4,623,249
 4,586,477
  4,544,489
 4,557,729
 4,529,114
 4,504,067
Gas marketing services773,984
 655,999
  630,475
 654,475
 633,460
 632,337
Total (period-end)5,397,233
 5,242,476
  5,174,964
 5,212,204
 5,162,574
 5,136,404
Employees (period-end)5,318
 5,292
  5,284
 5,203
 5,165
 6,094
Table of ContentsIndex to Financial Statements

SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA 2013-2017 (continued)
Southern Company Gas and Subsidiary Companies 2017 Annual Report
 Successor  Predecessor
 2017 July 1, 2016 through December 31, 2016  January 1, 2016 through June 30, 2016 2015 2014 2013
Operating Revenues (in millions)            
Residential$2,100
 $899
  $1,101
 $2,129
 $2,877
 $2,422
Commercial641
 260
  310
 617
 861
 696
Transportation811
 269
  290
 526
 458
 487
Industrial159
 74
  72
 203
 242
 180
Other209
 150
  132
 466
 947
 424
Total$3,920
 $1,652
  $1,905
 $3,941
 $5,385
 $4,209
Heating Degree Days:            
Illinois5,246
 1,903
  3,340
 5,433
 6,556
 6,305
Georgia1,970
 727
  1,448
 2,204
 2,882
 2,689
Gas Sales Volumes
(mmBtu in millions):
            
Gas distributions operations            
Firm667
 274
  396
 695
 766
 720
Interruptible95
 47
  49
 99
 106
 111
Total762
 321
  445
 794
 872
 831
Gas marketing services            
Firm:            
Georgia23
 13
  21
 35
 41
 38
Illinois8
 4
  8
 13
 17
 9
Other emerging markets15
 5
  7
 11
 10
 8
Interruptible (large commercial and
industrial)
11
 6
  8
 14
 17
 18
Total57
 28
  44
 73
 85
 73
Market share in Georgia (percent)29.2
 29.4
  29.3
 29.7
 30.6
 31.4
Wholesale gas services            
Daily physical sales (mmBtu in
millions/day
)
6.4
 7.2
  7.6
 6.8
 6.3
 5.7

Table of ContentsIndex to Financial Statements

PART III
Items 10 (other than the information under "Code of Ethics" below), 11, 12, 13, and 14 for Southern Company are incorporated by reference to Southern Company's Definitive Proxy Statement relating to the 20182024 Annual Meeting of Stockholders. Specifically, reference is made to "Corporate Governance at Southern Company" and "Section"Biographical Information about our Nominees for Director," as well as "Delinquent Section 16(a) Beneficial Ownership Reporting Compliance"Reports," if required, for Item 10, "Compensation Discussion and Analysis," "Executive Compensation Tables," and "Director Compensation" for Item 11, "Stock Ownership Information," "Executive Compensation Tables," and "Equity Compensation Plan Information" for Item 12, "Southern Company Board""Biographical Information about our Nominees for Item 13,Director" and "Principal Independent Registered Public Accounting Firm Fees" for Item 14.
Items 10 (other than the information under "Code of Ethics" below), 11, 12, 13, and 14 for Alabama Power and Mississippi Power are incorporated by reference to the Definitive Information Statements of Alabama Power and Mississippi Power relating to each of their respective 2018 Annual Meetings of Shareholders. Specifically, reference is made to "Nominees for Election as Directors," "Corporate Governance" and "Section 16(a) Beneficial Ownership Reporting Compliance" for Item 10, "Executive Compensation," "Compensation Committee Interlocks and Insider Participation," "Director Compensation," "Director Deferred Compensation Plan," and "Director Compensation Table" for Item 11, "Stock Ownership Table" and "Executive Compensation" for Item 12, "Certain Relationships and Related Transactions" and "Director Independence" at Southern Company" for Item 13, and "Principal Independent Registered Public Accounting Firm Fees" for Item 14.
Items 10, 11, 12, and 13 for each of Georgia Power, Gulf Power, Southern Power, and Southern Company Gasthe Subsidiary Registrants are omitted pursuant to General Instruction I(2)(c) of Form 10-K. Item 14 for each of Georgia Power, Gulf Power, Southern Power, and Southern Company Gasthe Subsidiary Registrants is contained herein.
ITEM 10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
Item 10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
Code of Ethics
The registrantsRegistrants collectively have adopted a code of business conduct and ethics (Code of Ethics) that applies to each director, officer, and employee of the registrantsRegistrants and their subsidiaries. The Code of Ethics can be found on Southern Company's website located at www.southerncompany.com. The Code of Ethics is also available free of charge in print to any shareholder by requesting a copy from Myra C. Bierria, Corporate Secretary, Southern Company, 30 Ivan Allen Jr. Boulevard NW, Atlanta, Georgia 30308. Any amendment to or waiver from the Code of Ethics that applies to executive officers and directors will be posted on the website.

III-1

Table of ContentsIndex to Financial Statements

ITEM 14.PRINCIPAL ACCOUNTANT FEES AND SERVICES
Item 14.PRINCIPAL ACCOUNTANT FEES AND SERVICES
The following represents the fees billed to Georgia Power, Gulf Power,the Subsidiary Registrants in 2023 and Southern Power for the last two fiscal years2022 by Deloitte & Touche LLP, each company's principal public accountant for 2017 and 2016:accountant:
20232022
 (in thousands)
Alabama Power
Audit Fees (1)
$3,830 $2,860 
Audit-Related Fees (2)
126 160 
Tax Fees— — 
All Other Fees (3)
139 165 
Total$4,095 $3,185 
Georgia Power
Audit Fees (1)
$5,611 $3,973 
Audit-Related Fees (4)
162 307 
Tax Fees— — 
All Other Fees (3)
134 148 
Total$5,907 $4,428 
Mississippi Power
Audit Fees (1)
$714 $1,432 
Audit-Related Fees (5)
113 
Tax Fees— — 
All Other Fees (3)
31 29 
Total$753 $1,574 
Southern Power
Audit Fees (1)
$1,105 $1,671 
Audit-Related Fees(6)
2,333 2,070 
Tax Fees— — 
All Other Fees (3)
53 38 
Total$3,491 $3,779 
Southern Company Gas
Audit Fees (1)(7)
$2,648 $3,863 
Audit-Related Fees (8)
800 350 
Tax Fees— — 
All Other Fees (3)
72 66 
Total$3,520 $4,279 
 2017 2016
 (in thousands)
Georgia Power   
Audit Fees (1)
$3,247
 $3,154
Audit-Related Fees (2)
96
 30
Tax Fees
 
All Other Fees (3)
1
 15
Total$3,344
 $3,199
Gulf Power   
Audit Fees (1)
$1,442
 $1,346
Audit-Related Fees3
 3
Tax Fees
 
All Other Fees (3)

 2
Total$1,445
 $1,351
Southern Power   
Audit Fees (1)
$1,778
 $1,817
Audit-Related Fees439
 372
Tax Fees
 
All Other Fees (3)
8
 6
Total$2,225
 $2,195
(1)Includes services performed in connection with financing transactions.
(2) Includes both audit andRepresents fees for non-statutory audit services in 2017 and non-statutory audit services associated with reviewing internal controls for a system implementation in 2016.2022 and attest services related to GHG emissions in 2023 and 2022 and sustainability bond expenditures in 2023.
(3)Represents registration fees for attendance at Deloitte & Touche LLP-sponsored education seminars.seminars and other non-audit advisory services.

(4)Represents fees for non-statutory audit services and audit services associated with reviewing internal controls for a system implementation in 2022 and attest services related to GHG emissions and sustainability bond expenditures in 2023 and 2022.
The following represents the(5)Represents fees billedfor non-statutory audit services and audit services associated with reviewing internal controls for a system implementation in 2022 and attest services related to sustainability bond expenditures in 2022 and GHG emissions in 2023 and 2022.
(6)Represents fees in connection with audits of Southern Power partnerships, attest services related to GHG emissions in 2023 and 2022, and agreed upon procedures in 2023.
(7)Includes fees in connection with statutory audits of several Southern Company GasGas subsidiaries.
(8)Represents fees for the last two fiscal years by PricewaterhouseCoopers LLP, Southern Company Gas' principal public accountant through February 11, 2016,non-statutory audit services and Deloitte & Touche LLP, Southern Company Gas' principal public accountant since February 11, 2016:
 2017 2016
 (in thousands)
Southern Company Gas   
Audit Fees (1)
$4,449
 $5,131
Audit-Related Fees (2)
579
 59
Tax Fees (3)

 65
All Other Fees (4)
8
 7
Total$5,036
 $5,262
(1)Includes Deloitte & Touche LLP fees in connection with financing transactions and PricewaterhouseCoopers LLP and Deloitte & Touche LLP fees in connection with audits of several subsidiaries in addition to the consolidated audit.
(2)Represents fees for non-statutory audit services in 2017 and a review report on internal controls provided to third parties billed by Deloitte & Touche LLP in 2017 and 2016.
(3)Represents fees billed by Deloitte & Touche LLP for tax compliance services.
(4)Represents registration fees for attendance at Deloitte & Touche LLP-sponsored education seminars and subscription fees for Deloitte & Touche LLP's technical accounting research tool.

Table of ContentsIndexaudit services associated with reviewing internal controls for a system implementation in 2022, attest services related to Financial Statements

GHG emissions and sustainability bond expenditures in 2023 and 2022, and audit services associated with a forecast review in 2023.
The Southern Company Audit Committee (on behalf of Southern Company and its subsidiaries) adoptedhas a Policy of Engagement of the Independent Auditor for Audit and Non-Audit Services that includes pre-approval requirements for such Audit Committee to pre-approvethe audit and non-audit services provided by Deloitte & Touche LLP. All of the audit services provided by Deloitte & Touche LLP in fiscal years 20172023 and 2016 (described in the footnotes to the table above)2022 and related fees were approved in advance by the Southern Company Audit Committee.

III-2
Prior to the closing of the Merger, the Southern Company Gas Audit Committee had responsibility for appointing, setting compensation, and overseeing the work of Southern Company Gas' independent registered public accounting firm. In recognition of this responsibility, Southern Company Gas' Audit Committee adopted a policy that required specific Audit Committee approval before any services were provided by the independent registered public accounting firm. All of the audit services provided by PricewaterhouseCoopers LLP and Deloitte & Touche LLP in fiscal year 2016 (described in the footnotes to the table above) prior to the closing of the Merger and related fees were approved in advance by the Southern Company Gas Audit Committee.

Table of ContentsIndex to Financial Statements

PART IV
Item 15.EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
(a)The following documents are filed as a part of this report on Form 10-K:
(1)Financial Statements and Financial Statement Schedules:
Item 15.EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
(a)The following documents are filed as a part of this report on Form 10-K:
(1)Financial Statements and Financial Statement Schedules:
Management's ReportReports on Internal Control Over Financial Reporting for Southern Company and Subsidiary Companies, is listed under Item 8 herein.
Management's Report on Internal Control Over Financial Reporting for Alabama Power, is listed under Item 8 herein.
Management's Report on Internal Control Over Financial Reporting for Georgia Power, is listed under Item 8 herein.
Management's Report on Internal Control Over Financial Reporting for Gulf Power is listed under Item 8 herein.
Management's Report on Internal Control Over Financial Reporting for Mississippi Power, is listed under Item 8 herein.
Management's Report on Internal Control Over Financial Reporting for Southern Power and Subsidiary Companies, is listed under Item 8 herein.
Management's Report on Internal Control Over Financial Reporting forand Southern Company Gas and Subsidiary Companies isare listed under Item 89A herein.
Reports of Independent Registered Public Accounting Firm (Deloitte & Touche LLP, PCAOB ID: 34) on the financial statements and financial statement schedules for Southern Company and Subsidiary Companies, Alabama Power Company, Georgia Power GulfCompany, Mississippi Power MississippiCompany, Southern Power Company and Subsidiary Companies, and Southern Company Gas and Subsidiary Companies as well asare listed under Item 8 herein. Also included in Item 8 herein is the Report of Independent Registered Public Accounting Firm (BDO USA, P.C.; Houston, Texas; PCAOB ID: 243) on the financial statements of Southern Power and Subsidiary Companies are listed under Item 8 herein.Natural Gas Company, L.L.C., Southern Company Gas' investment which is accounted for by the use of the equity method.
The financial statements filed as a part of this report for Southern Company and Subsidiary Companies, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power and Subsidiary Companies, and Southern Company Gas and Subsidiary Companies are listed under Item 8 herein.
The financial statement schedules (Schedule II, Valuation and Qualifying Accounts and Reserves) for Southern Company and Subsidiary Companies, Alabama Power, Georgia Power, GulfMississippi Power, MississippiSouthern Power and Subsidiary Companies, and Southern Company Gas and Subsidiary Companies are listedincluded on pages IV-2 and IV-3. Columns in Schedule II may be omitted if the Index to the Financial Statement Schedules at page S-1.information is not applicable or not required. All other schedules are omitted as not applicable or not required.
The financial statements of Southern Natural Gas Company, L.L.C. as of December 31, 2017 and 2016 and(2)Exhibits:
Exhibits for the year ended December 31, 2017 and the four months ended December 31, 2016 are provided by Southern Company Gas as separate financial statements of subsidiaries not consolidated pursuant to Rule 3-09 of Regulation S-X, and are incorporated by reference herein from Exhibit 99(g) hereto.
(2)Exhibits:
Exhibits for Southern Company, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power, and Southern Company GasRegistrants are listed in the Exhibit Index at page E-1.


Item 16.FORM 10-K SUMMARY


None.

IV-1


Table of ContentsIndex to Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholders and the Board of Directors of The Southern Company and Subsidiary Companies
Opinion on the Financial Statement Schedule
We have audited the consolidated financial statements of Southern Company and Subsidiary Companies (the Company) as of December 31, 2017 and 2016, and for each of the three years in the period ended December 31, 2017, and the Company's internal control over financial reporting as of December 31, 2017, and have issued our report thereon dated February 20, 2018; such report is included elsewhere in this Form 10-K. Our audits also included the consolidated financial statement schedule of the Company (page S-2) listed in the Index at Item 15. This consolidated financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion based on our audits. In our opinion, such consolidated financial statement schedule, when considered in relation to the financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018

Table of ContentsIndex to Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholders and the Board of Directors of Alabama Power Company
Opinion on the Financial Statement Schedule
We have audited the financial statements of Alabama Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, and for each of the three years in the period ended December 31, 2017, and have issued our report thereon dated February 20, 2018; such report is included elsewhere in this Form 10-K. Our audits also included the financial statement schedule of the Company (Page S-3) listed in the Index at Item 15. This financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion based on our audits. In our opinion, such financial statement schedule, when considered in relation to the financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.
/s/ Deloitte & Touche LLP
Birmingham, Alabama
February 20, 2018

Table of ContentsIndex to Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Georgia Power Company
Opinion on the Financial Statement Schedule
We have audited the financial statements of Georgia Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, and for each of the three years in the period ended December 31, 2017, and have issued our report thereon dated February 20, 2018; such report is included elsewhere in this Form 10-K. Our audits also included the financial statement schedule of the Company (Page S-4) listed in the Index at Item 15. This financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion based on our audits. In our opinion, such financial statement schedule, when considered in relation to the financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018

Table of ContentsIndex to Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Gulf Power Company
Opinion on the Financial Statement Schedule
We have audited the financial statements of Gulf Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, and for each of the three years in the period ended December 31, 2017, and have issued our report thereon dated February 20, 2018; such report is included elsewhere in this Form 10-K. Our audits also included the financial statement schedule of the Company (Page S-5) listed in the Index at Item 15. This financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statement schedule based on our audits. In our opinion, such financial statement schedule, when considered in relation to the financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018

Table of ContentsIndex to Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholders and the Board of Directors of Mississippi Power Company
Opinion on the Financial Statement Schedule
We have audited the financial statements of Mississippi Power Company (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, and for each of the three years in the period ended December 31, 2017, and have issued our report thereon dated February 20, 2018; such report is included elsewhere in this Form 10-K. Our audits also included the financial statement schedule of the Company (Page S-6) listed in the Index at Item 15. This financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion based on our audits. In our opinion, such financial statement schedule, when considered in relation to the financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018


Table of ContentsIndex to Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the stockholder and the Board of Directors of Southern Company Gas and Subsidiary Companies
Opinion on the Financial Statement Schedule
We have audited the consolidated financial statements of Southern Company Gas and Subsidiary Companies (the Company) (a wholly-owned subsidiary of The Southern Company) as of December 31, 2017 and 2016, and the related consolidated statements of income, comprehensive income, stockholders' equity, and cash flows, for the year ended December 31, 2017 and the six-month periods ended June 30, 2016 (Predecessor) and December 31, 2016 (Successor), and have issued our report thereon dated February 20, 2018; such report is included elsewhere in this Form 10-K. As indicated in that report, we did not audit the financial statements of Southern Natural Gas Company, L.L.C. (SNG), the Company's investment in which is accounted for by the use of the equity method. The Company's consolidated financial statements include its equity investment in SNG of $1,262 million and $1,394 million as of December 31, 2017 and December 31, 2016, respectively, and its earnings from its equity method investment in SNG of $88 million and $56 million for the year ended December 31, 2017 and the six months ended December 31, 2016, respectively. Those statements were audited by other auditors whose report (which expresses an unqualified opinion on SNG's financial statements and contains an emphasis of matter paragraph concerning the extent of its operations and relationships with affiliated entities) have been furnished to us, and our opinion, insofar as it relates to the amounts included for SNG, is based solely on the report of the other auditors. Our audits also included the consolidated financial statement schedule of the Company (Page S-7) listed in the Index at Item 15. This consolidated financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion based on our audits. In our opinion, such consolidated financial statement schedule, when considered in relation to the financial statements taken as a whole, presents fairly, in all material respects, the information set forth therein.
/s/ Deloitte & Touche LLP
Atlanta, Georgia
February 20, 2018

Table of ContentsIndex to Financial Statements

INDEX TO FINANCIAL STATEMENT SCHEDULES
Page
Schedule II
Valuation and Qualifying Accounts and Reserves 2017, 2016, and 2015
S-2
S-3
S-4
S-5
S-6
S-7
Schedules I through V not listed above are omitted as not applicable or not required. A Schedule II for Southern Power Company and Subsidiary Companies is not being provided because there were no reportable items for the three-year period ended December 31, 2017. Columns omitted from schedules filed have been omitted because the information is not applicable or not required.

Table of ContentsIndex to Financial Statements

THE SOUTHERN COMPANY AND SUBSIDIARY COMPANIES
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
FOR THE YEARS ENDED DECEMBER 31, 2017, 2016,2023, 2022, AND 20152021
(Stated in Thousands of Dollars)
Additions
DescriptionBalance at Beginning of PeriodCharged to IncomeCharged to Other Accounts
Deductions(a)
Balance at End of Period
(in millions)
Provision for uncollectible accounts:
Southern Company(b)
2023$71 $87 $$93 $68 
202278 71 (1)77 71 
2021118 51 (23)68 78 
Alabama Power
2023$14 $16 $— $14 $16 
202214 10 — 10 14 
202143 (7)— 22 14 
Georgia Power(b)
2023$$26 $— $25 $
202221 — 20 
202126 16 (23)17 
Mississippi Power
2023$$$— $$
2022
2021— 
Southern Power
2023$$— $— $— $
2022(2)— 
2021— — — 
Southern Company Gas
2023$50 $43 $$52 $44 
202239 55 — 44 50 
202140 26 — 27 39 
   Additions    
DescriptionBalance at Beginning of Period Charged to Income Charged to Other Accounts Acquisitions Deductions (Note) Balance at End of Period
Provision for uncollectible accounts           
2017$43,429
 $55,770
 $(248) $30
 $54,605
 $44,376
201613,341
 39,959
 (1,257) 40,629
 49,243
 43,429
201518,253
 31,074
 
 
 35,986
 13,341
(Note)    Represents write-off(a)Deductions represent write-offs of accounts considered to be uncollectible, less recoveries of amounts previously written off.

(b)During 2020, Georgia Power recorded $23 million of expected bad debt related to the COVID-19 pandemic to a regulatory asset in accordance with orders from the Georgia PSC. During 2021, based on a review of bad debt amounts under a Georgia PSC-approved methodology, Georgia Power reversed substantially all of the amount recorded in 2020.
IV-2

Table of ContentsIndex to Financial Statements

ALABAMA POWER COMPANY
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS (CONTINUED)
FOR THE YEARS ENDED DECEMBER 31, 2017, 2016,2023, 2022, AND 20152021
(Stated
Additions
DescriptionBalance at Beginning of PeriodCharged to IncomeCharged to Other AccountsDeductionsBalance at End of Period
(in millions)
Tax valuation allowance (net state):
Southern Company(a)(b)
2023$207 $(14)$(25)$— $168 
2022169 68 (30)— 207 
2021112 57 — — 169 
Georgia Power(a)
2023$98 $(15)$(23)$— $60 
202258 70 (30)— 98 
202128 30 — — 58 
Mississippi Power(b)
2023$32 $— $— $— $32 
202232 — — — 32 
202132 — — — 32 
Southern Power(b)
2023$21 $— $— $— $21 
202221 — — — 21 
202127 (6)— — 21 
Southern Company Gas(b)
2023$$— $(2)$— $
2022— — — 
2021— — 
(a)In 2018, Georgia Power established a valuation allowance for certain Georgia state tax credits expected to expire prior to being fully utilized, which has been adjusted in Thousandssubsequent years as a result of Dollars)changes in projected state taxable income.
(b)Associated with a state net operating loss carryforward expected to expire prior to being fully utilized.
See Note 10 to the financial statements in Item 8 herein for additional information.
IV-3
   Additions    
Description
Balance at Beginning
of Period
 
Charged to
Income
 Charged to Other Accounts 
Deductions
(Note)
 
Balance at
End of Period
Provision for uncollectible accounts         
2017$10,487
 $9,367
 $
 $11,075
 $8,779
20169,597
 11,310
 
 10,420
 10,487
20159,143
 13,500
 
 13,046
 9,597
(Note)    Represents write-off of accounts considered to be uncollectible, less recoveries of amounts previously written off.

Table of ContentsIndex to Financial Statements

GEORGIA POWER COMPANY
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
FOR THE YEARS ENDED DECEMBER 31, 2017, 2016, AND 2015
(Stated in Thousands of Dollars)
   Additions    
Description
Balance at Beginning
of Period
 
Charged to
Income
 
Charged to Other
Accounts
 
Deductions
(Note)
 Balance at End of Period
Provision for uncollectible accounts         
2017$2,836
 $11,250
 $
 $11,474
 $2,612
20162,147
 14,476
 
 13,787
 2,836
20156,076
 16,862
 
 20,791
 2,147
(Note)    Represents write-off of accounts considered to be uncollectible, less recoveries of amounts previously written off.

Table of ContentsIndex to Financial Statements

GULF POWER COMPANY
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
FOR THE YEARS ENDED DECEMBER 31, 2017, 2016, AND 2015
(Stated in Thousands of Dollars)
   Additions    
Description
Balance at Beginning
of Period
 
Charged to
Income
 
Charged to Other
Accounts
 
Deductions
(Note)
 Balance at End of Period
Provision for uncollectible accounts         
2017$732
 $2,859
 $
 $2,846
 $745
2016775
 2,946
 
 2,989
 732
20152,087
 2,041
 
 3,353
 775
(Note)    Represents write-off of accounts considered to be uncollectible, less recoveries of amounts previously written off.

Table of ContentsIndex to Financial Statements

MISSISSIPPI POWER COMPANY
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
FOR THE YEARS ENDED DECEMBER 31, 2017, 2016, AND 2015
(Stated in Thousands of Dollars)
   Additions    
Description
Balance at Beginning
of Period
 
Charged to
Income
 
Charged to Other
Accounts
 
Deductions
(Note)
 Balance at End of Period
Provision for uncollectible accounts         
2017$494
 $1,377
 $
 $1,279
 $592
2016287
 1,295
 
 1,088
 494
2015(*)825
 (1,994) 
 (1,456) 287
(Note)    Represents write-off of accounts considered to be uncollectible, less recoveries of amounts previously written off.

(*)The refund ordered by the Mississippi PSC pursuant to the 2015 Mississippi Supreme Court decision relative to a regulatory liability used by Mississippi Power to record financing costs associated with construction of the Kemper County energy facility involved refunding all billed amounts to all historical customers and included an interest component. The refund of approximately $371 million in 2015 was of sufficient magnitude to resolve most past due amounts beyond 30 days aged receivables, accounting for the negative provision of $(2.0) million where risk of collectibility was offset by applying the refund to past due amounts. It was also of sufficient size to offset amounts previously written off in the 2012-2015 time frame, accounting for the net recoveries of $1.5 million.
Table of ContentsIndex to Financial Statements

SOUTHERN COMPANY GAS AND SUBSIDIARY COMPANIES
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
FOR THE SUCCESSOR PERIODS OF JULY 1, 2016 THROUGH DECEMBER 31, 2016
AND THE YEAR ENDED DECEMBER 31, 2017
AND THE PREDECESSOR PERIODS OF JANUARY 1, 2016 THROUGH JUNE 30, 2016
AND THE YEAR ENDED DECEMBER 31, 2015
(Stated in Thousands of Dollars)
   Additions    
Description
Balance at Beginning
of Period
 
Charged to
Income
 Charged to Other Accounts 
Deductions
(Note)
 
Balance at
End of Period
Successor – December 31, 2017         
Provision for uncollectible accounts$27,316
 $28,022
 $(248) $27,286
 $27,804
Income tax valuation19,182
 
 
 7,910
 11,272
Successor – December 31, 2016         
Provision for uncollectible accounts$37,663
 $9,500
 $(1,257) $18,590
 $27,316
Income tax valuation19,182
 
 
 
 19,182
Predecessor – June 30, 2016         
Provision for uncollectible accounts$29,142
 $15,976
 $1,608
 $9,063
 $37,663
Income tax valuation19,182
 
 
 
 19,182
Predecessor – 2015         
Provision for uncollectible accounts$35,069
 $27,050
 $3,017
 $35,994
 $29,142
Income tax valuation19,637
 
 
 455
 19,182
(Note)    Represents write-off of accounts considered to be uncollectible, less recoveries of amounts previously written off.

Table of ContentsIndex to Financial Statements

EXHIBIT INDEX
The exhibits below with an asterisk (*) preceding the exhibit number are filed herewith. The remaining exhibits have previously been filed with the SEC and are incorporated herein by reference. The exhibits marked with a pound sign (#) are management contracts or compensatory plans or arrangements required to be identified as such by Item 15 of Form 10-K.
(3)Articles of Incorporation and By-Laws
Southern Company
(2)(a)1Plan
Restated Certificate of acquisition, reorganization, arrangement, liquidation or successionIncorporation of Southern Company, dated February 12, 2019. (Designated in Form 10-K for the year ended December 31, 2018, File No. 1-3526, as Exhibit 3(a)1.)
(a)2Southern Company
(a)1
AgreementAmended and PlanRestated By-laws of Merger by and among Southern Company AMS Corp.,effective December 12, 2022, and Southern Company Gas, dated August 23, 2015. as presently in effect. (Designated in Form 8-K dated August 23, 2015,December 12, 2022, File No. 1-3526, as Exhibit 2.1.3.1.)
Southern Company GasAlabama Power
(b)1(g)1Agreement and Plan of Merger by and among Southern Company, AMS Corp., and Southern Company Gas, dated August 23, 2015. See Exhibit 2(a)1 herein.
(g)2
Purchase and Sale Agreement, dated as of July 10, 2016, among Kinder Morgan SNG Operator LLC, Southern Natural Gas Company, L.L.C., and Southern Company.(Designated in Form 8-K dated August 31, 2016, File No. 1-14174, as Exhibit 2.1a.)
(g)3
Assignment, Assumption and Novation of Purchase and Sale Agreement, dated as of August 31, 2016, between Southern Company and Evergreen Enterprise Holdings LLC. (Designated in Form 8-K dated August 31, 2016, File No. 1-14174, as Exhibit 2.1b.)
(3)Articles of Incorporation and By-Laws
Southern Company
(a)1
Composite Certificate of Incorporation of Southern Company, reflecting all amendments thereto through May 26, 2016. (Designated in Registration No. 33-3546 as Exhibit 4(a), in Certificate of Notification, File No. 70-7341, as Exhibit A, in Certificate of Notification, File No. 70-8181, as Exhibit A, in Form 8-K dated May 26, 2010, File No. 1-3526, as Exhibit 3.1, and in Form 8-K dated May 25, 2016, File No. 1-3526, as Exhibit 3.1.)
(a)2
By-laws of Southern Company as amended effective May 25, 2016, and as presently in effect. (Designated in Form 8-K dated May 25, 2016, File No. 1-3526, as Exhibit 3.2.)
Alabama Power
(b)1
Charter of Alabama Power and amendments thereto through September 7, 2017. (Designated in Registration Nos. 2-59634 as Exhibit 2(b), 2-60209 as Exhibit 2(c), 2-60484 as Exhibit 2(b), 2-70838 as Exhibit 4(a)-2, 2-85987 as Exhibit 4(a)-2, 33-25539 as Exhibit 4(a)-2, 33-43917 as Exhibit 4(a)-2, in Form 8-K dated February 5, 1992, File No. 1-3164, as Exhibit 4(b)-3, in Form 8-K dated July 8, 1992, File No. 1-3164, as Exhibit 4(b)-3, in Form 8-K dated October 27, 1993, File No. 1-3164, as Exhibits 4(a) and 4(b), in Form 8-K dated November 16, 1993, File No. 1-3164, as Exhibit 4(a), in Certificate of Notification, File No. 70-8191, as Exhibit A, in Form 10-K for the year ended December 31, 1997, File No. 1-3164, as Exhibit 3(b)2, in Form 8-K dated August 10, 1998, File No. 1-3164, as Exhibit 4.4, in Form 10-K for the year ended December 31, 2000, File No. 1-3164, as Exhibit 3(b)2, in Form 10-K for the year ended December 31, 2001, File No. 1-3164, as Exhibit 3(b)2, in Form 8-K dated February 5, 2003, File No. 1-3164, as Exhibit 4.4, in Form 10-Q for the quarter ended March 31, 2003, File No 1-3164, as Exhibit 3(b)1, in Form 8-K dated February 5, 2004, File No. 1-3164, as Exhibit 4.4, in Form 10-Q for the quarter ended March 31, 2006, File No. 1-3164, as Exhibit 3(b)(1), in Form 8-K dated December 5, 2006, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated September 12, 2007, File No. 1-3164, as Exhibit 4.5, in Form 8-K dated October 17, 2007, File No. 1-3164, as Exhibit 4.5, in Form 10-Q for the quarter ended March 31, 2008, File No. 1-3164, as Exhibit 3(b)1, and in Form 8-K dated September 5, 2017, File No. 1-3164, as Exhibit 4.1.)
(b)2(b)2
Amended and Restated By-laws of Alabama Power effective February 10, 2014,October 16, 2023, and as presently in effect. (Designated in Form 8-K dated February 10 2014,-Q for the quarter ended September 30, 2023, File No 1-3164, as Exhibit 3.1.3(b)1.)
Table of ContentsIndex to Financial Statements

Georgia Power
(c)1Georgia Power
(c)1
Charter of Georgia Power and amendments thereto through October 9, 2007. (Designated in Registration Nos. 2-63392 as Exhibit 2(a)-2, 2-78913 as Exhibits 4(a)-(2) and 4(a)-(3), 2-93039 as Exhibit 4(a)-(2), 2-96810 as Exhibit 4(a)-2, 33-141 as Exhibit 4(a)-(2), 33-1359 as Exhibit 4(a)(2), 33-5405 as Exhibit 4(b)(2), 33-14367 as Exhibits 4(b)-(2) and 4(b)-(3), 33-22504 as Exhibits 4(b)-(2), 4(b)-(3) and 4(b)-(4), in Form 10-K for the year ended December 31, 1991, File No. 1-6468, as Exhibits 4(a)(2) and 4(a)(3), in Registration No. 33-48895 as Exhibits 4(b)-(2) and 4(b)-(3), in Form 8-K dated December 10, 1992, File No. 1-6468 as Exhibit 4(b), in Form 8-K dated June 17, 1993, File No. 1-6468, as Exhibit 4(b), in Form 8-K dated October 20, 1993, File No. 1-6468, as Exhibit 4(b), in Form 10-K for the year ended December 31, 1997, File No. 1-6468, as Exhibit 3(c)2, in Form 10-K for the year ended December 31, 2000, File No. 1-6468, as Exhibit 3(c)2, in Form 8-K dated June 27, 2006, File No. 1-6468, as Exhibit 3.1, and in Form 8-K dated October 3, 2007, File No. 1-6468, as Exhibit 4.5.)
(c)2(c)2
By-laws of Georgia Power as amended effective November 9, 2016, and as presently in effect. (Designated(Designated in Form 8-K dated November 9, 2016, File No. 1-6468, as Exhibit 3.1.)
GulfMississippi Power
(d)1(d)1
(d)2
By-laws of Gulf Power as amended effective July 1, 2017, and as presently in effect. 22, 2020. ((Designated in Form 10-Q for the quarter ended March 31, 2017, File No. 001-31737, as Exhibit 3(d).)
Mississippi Power
(e)1
Articles of Incorporation of Mississippi Power, articles of merger of Mississippi Power Company (a Maine corporation) into Mississippi Power and articles of amendment to the articles of incorporation of Mississippi Power through April 2, 2004. (Designated in Registration No. 2-71540 as Exhibit 4(a)-1, in Form U5S for 1987, File No. 30-222-2, as Exhibit B-10, in Registration No. 33-49320 as Exhibit 4(b)-(1), in Form 8-K dated August 5, 1992, File No. 001-11229, as Exhibits 4(b)-2 and 4(b)-3, in Form 8-K dated August 4, 1993,June 30, 2020, File No. 001-11229, as Exhibit 4(b)-3, in Form 8-K dated August 18, 1993, File No. 001-11229, as Exhibit 4(b)-3, in Form 10-K for the year ended December 31, 1997, File No. 001-11229, as Exhibit 3(e)2,3(d)1. in Form 10-K for the year ended December 31, 2000, File No. 001-11229, as Exhibit 3(e)2, and in Form 8-K dated March 3, 2004, File No. 001-11229, as Exhibit 4.6.)
(d)2(e)2
By-laws of Mississippi Power as amended effective July 1, 2017,22, 2020, and as presently in effect. ((Designated in Form 10-Q for the quarter ended March 31, 2017,June 30, 2020, File No. 001-11229, as Exhibit 3(e)3(d)2.)
E-1

Table of ContentsIndex to Financial Statements
Southern Power
(e)1Southern Power
(f)1
Certificate of Incorporation of Southern Power Company dated January 8, 2001. (Designated in Registration No. 333-98553 as Exhibit 3.1.)
(e)2(f)2
By-laws of Southern Power Company effective January 8, 2001. (Designated in Registration No. 333-98553 as Exhibit 3.2.)
Southern Company Gas
(f)1(f)1
Amended and Restated Articles of Incorporation of Southern Company Gas dated July 11, 2016. (Designated in Form 8-K dated July 8, 2016, File No. 1-14174, as Exhibit 3.1.)
(f)2(f)2
Amended and Restated By-laws of Southern Company Gas effective July 11, 2016. October 23, 2018. (Designated in Form 8-K dated July 8, 2016,10-Q for the quarter ended June 30, 2019, File No. 1-14174, as Exhibit 3.2.3(e).)
(4)Instruments Describing Rights of Security Holders, Including Indentures
With respect to each of Southern Company, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power Company, and Southern Company Gas, such registrantRegistrant has excluded certain instruments with respect to long-term debt that does not exceed 10% of the total assets of such registrantRegistrant and its subsidiaries. Each such registrantRegistrant agrees, upon request of the SEC, to furnish copies of any or all such instruments to the SEC.
Table of ContentsIndex to Financial Statements

Southern Company
(a)1Southern Company
(a)1
Senior Note Indenture dated as of January 1, 2007, between Southern Company and Wells Fargo Bank, National Association,Computershare Trust Company, N.A., as successor Trustee, and certain indentures supplemental thereto through June 21, 2017.September 8, 2023. (Designated in Form 8-K dated January 11, 2007, File No. 1-3526, as Exhibit 4.1, in Form 8-K dated August 21, 2013, File No. 1-3526, as Exhibit 4.2, in Form 8-K dated August 19, 2014, File No. 1-3526, as Exhibit 4.2(b), in Form 8-K dated June 9, 2015, File No. 1-3526, as Exhibit 4.2, in Form 8-K dated May 19, 2016, File No. 1-3526, as Exhibit 4.2(a), in Form 8-K dated May 19, 2016, File No. 1-3526, as Exhibit 4.2(b), in Form 8-K dated May 19, 2016, File No. 1-3526, as Exhibit 4.2(c), in Form 8-K dated May 19, 2016, File No. 1-3526, as Exhibit 4.2(d), in Form 8-K dated May 19, 2016, File No. 1-3526, as Exhibit 4.2(e), in Form 8-K dated May 19, 2016, File No. 1-3526, as Exhibit 4.2(f), in Form 8-K dated May 19, 2016, File No. 1-3526, as Exhibit 4.2(g), and in Form 10-Q for the quarter ended June 30, 2017,8-K dated April 1, 2020, File No. 1-3526, as Exhibit 4(a)24.2, in Form 8-K dated February 23, 2021, File No. 1-3526, as Exhibit 4.4(a), in Form 8-K dated February 23, 2021, File No. 1-3526, as Exhibit 4.4(b), in Form 8-K dated October 3, 2022, File No. 1-3526, as Exhibit 4.4(a), in Form 8-K dated October 3, 2022, File No. 1-3526, as Exhibit 4.4(b), in Form 8-K dated February 28, 2023, File No. 1-3526, as Exhibit 4.2, in Form 8-K dated May 15, 2023, File No. 1-3526, as Exhibit 4.4(a), in Form 8-K dated May 15, 2023, File No. 1-3526, as Exhibit 4.4(b), in Form 8-K dated September 5, 2023, File No. 1-3526, as Exhibit 4.4(a), and in Form 8-K dated September 5, 2023, File No. 1-3526, as Exhibit 4.4(b).)
(a)2(a)2
Subordinated Note Indenture dated as of October 1, 2015, between The Southern Company and Wells Fargo Bank, National Association,Computershare Trust Company, N.A., as successor Trustee, and certain indentures supplemental thereto through November 22, 2017.May 1, 2022. (Designated in Form 8-K dated October 1, 2015, File No. 1-3526, as Exhibit 4.3, inForm 8-K dated October 1, 2015, File No. 1-3526, as Exhibit 4.4, in Form 8-K dated September 12, 2016, File No. 1-3526, as Exhibit 4.4, in Form 8-K dated December 5, 2016, File No. 1-3526, as Exhibit 4.4, in Form 10-Q for the quarter ended June 30, 2017, File No. 1-3526 as Exhibit 4(a)1, and in Form 8-K dated November 17, 2017, File No. 1-3526, as Exhibit 4.4.)
Alabama Power
(b)1

(a)3(b)
Description of securities registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended. (Designated in Form 10-K for the year ended December 31, 2022, File No. 1-3526, as Exhibit 4(a)3.)
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Table of ContentsIndex to Financial Statements
Alabama Power
(b)21
Senior Note Indenture dated as of December 1, 1997, between Alabama Power and Regions Bank, as Successor Trustee, and certain indentures supplemental thereto through November 8, 2017.9, 2023. (Designated in Form 8-K dated December 4, 1997, File No. 1-3164, as Exhibit 4.1, bit 4.2, in Form 8-K dated December 6, 2002, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated February 11, 2003, File No. 1-3164, as Exhibit 4.2(a), in Form 8-K dated February 11, 2003, File No. 1-3164, as Exhibit 4.2(b), in Form 8-K dated March 12, 2003, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated May 1, 2003, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated November 14, 2003, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated May 8, 2008, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated February 26, 2009, File No. 1-3164 as Exhibit 4.2, in Form 8-K dated September 27, 2010, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated March 3, 2011, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated May 18, 2011, File No. 1-3164, as Exhibit 4.2(a), in Form 8-K dated May 18, 2011, File No. 1-3164, as Exhibit 4.2(b),in Form 8-K dated January 10, 2012, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated October 9, 2012, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated November 27, 2012, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated December 3, 2013, File No. 1-3164, as Exhibit 4.2, in Form 8-K dated August 20, 2014, File No. 1-3164, as Exhibit 4.6, in Form 8-K dated March 5, 2015, File No. 1-3164, as Exhibit 4.6, in Form 8-K dated April 9, 2015, File No. 1-3164, as Exhibit 4.6(b), in Form 8-K dated January 8, 2016, File No. 1-3164, as Exhibit 4.6, in Form 8-K dated February 27, 2017, File No. 1-3164, as Exhibit 4.6, and in Form 8-K dated November 2, 2017, File No. 1-3164, as Exhibit 4.6.)
(b)3
Amended and Restated Trust Agreement of Alabama Power Capital Trust V dated as of October 1, 2002. (Designated, in Form 8-K dated September 26, 2002,June 21, 2018, File No. 1-3164, as Exhibit 4.12-B.)4.6
(b)4
Table of ContentsIndex to Financial Statements

Georgia Power
(c)1Georgia Power
(c)1
Senior Note Indenture dated as of January 1, 1998, between Georgia Power and Wells Fargo Bank, National Association,Computershare Trust Company, N.A., as Successor Trustee, and certain indentures supplemental thereto through AugustNovember 8, 2017.2023. (Designated in Form 8-K dated January 21, 1998, File No. 1-6468, as Exhibits 4.1, in Form 8-K dated April 10, 2003, File No. 1-6468, as Exhibit 4.1, in Form 8-K dated March 6, 2007, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated May 27, 2008, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated February 4, 2009, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated December 8, 2009, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated May 24, 2010, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated August 26, 2010, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated February 29, 2012, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated May 8, 2012, File No. 1-6468, as Exhibit 4.2(b), in Form 8-K dated March 12, 2013, File No. 1-6468, as Exhibit 4.2(a), in Form 8-K dated December 1, 2015, File No. 1-6468, as Exhibit 4.2, in Form 8-K dated March 2, 2016, File No. 1-6468, as Exhibit 4.2(a), in Form 8-K dated March 2, 2016, File No. 1-6468, as Exhibit 4.2(b), in Form 8-K dated February 28, 2017, File No. 1-6468, as Exhibit 4.2(a), in Form 8-K dated February 28, 2017, File No. 1-6468, as Exhibit 4.2(b), and in Form 8-K dated August 3, 2017,September 4, 2019, File No. 1-6468, as Exhibit 4.2(a), in Form 8-K dated September 4, 2019, File No. 1-6468, as Exhibit 4.2(b), in Form 8-K dated January 8, 2020, File No. 1-6468, as Exhibit 4.2(c), in Form 8-K dated February 22, 2021, File No. 1-6468, as Exhibit 4.2 in Form 8-K dated May 2, 2022, File No. 1-6468, as Exhibit 4.2(a), in Form 8-K dated May 2, 2022, File No. 1-6468, as Exhibit 4.2(b), in Form 8-K dated May 1, 2023, File No. 1-6468, as Exhibit 4.2(a), in Form 8-K dated May 1, 2023, File No. 1-6468, as Exhibit 4.2(b), and in Form 8-K dated November 3, 2023, File No.1-6468, as Exhibit 4.2.)
(c)2(c)2
Subordinated Note Indenture, dated as of September 1, 2017, between Georgia Power and Wells Fargo Bank, National Association,Computershare Trust Company, N.A., as Successor Trustee, and First Supplemental Indenture thereto dated as of September 21, 2017. (Designated in Form 8-K dated September 18, 2017, File No. 1-6468, as Exhibit 4.3, and in Form 8-K dated September 18, 2017, File No. 1-6468, as Exhibit 4.4.)
(c)3(c)3
Amended and Restated Loan Guarantee Agreement, dated as of March 22, 2019, between Georgia Power and the DOE dated as of February 20, 2014, Amendment No. 1 thereto dated as of June 4, 2015, Amendment No. 2 thereto dated as of March 9, 2016, Amendment No. 3 thereto dated as of July 27, 2017, and Amendment No. 4 thereto dated as of December 8, 2017.DOE. (Designated in Form 8-K dated February 20, 2014,March 22, 2019, File No. 1-6468, as Exhibit 4.1, in Form 10-Q for the quarter ended June 30, 2015, File No. 1-6468, as Exhibit 10(c)1, in Form 10-Q for the quarter ended March 31, 2016, File No. 1-6468, as Exhibit 4(c)3, in Form 8-K dated July 27, 2017, File No. 1-6468, as Exhibit 4.1, and in Form 8-K dated December 8, 2017, File No. 1-6468, as Exhibit 4.1.)
(c)4(c)4
Note Purchase Agreement among Georgia Power, the DOE, and the Federal Financing Bank dated as of February 20, 2014. (Designated in Form 8-K dated February 20, 2014, File No. 1-6468, as Exhibit 4.2.)
(c)5(c)5
Future Advance Promissory Note dated February 20, 2014 made by Georgia Power to the FFB. (Designated in Form 8-K dated February 20, 2014, File No. 1-6468, as Exhibit 4.3.)
(c)6(c)6
Amended and Restated Deed to Secure Debt, Security Agreement and Fixture Filing, betweendated as of March 22, 2019, by Georgia Power to PNC Bank, National Association, doing business as Midland Loan Services Inc., a division of PNC Bank, National Association. (Designated in Form 8-K dated March 22, 2019, File No. 1-6468, as Exhibit 4.4.)
(c)7
Amended and Restated Owners Consent to Assignment and Direct Agreement and Amendment to Plant Alvin W. Vogtle Additional Units Ownership Participation Agreement, dated as of March 22, 2019, among Georgia Power, the other Vogtle Owners, the DOE, and PNC Bank, National Association, doing business as Midland Loan Services Inc., a division of PNC Bank, National Association dated as of February 20, 2014. (DesignatedAssociation. (Designated in Form 8-K dated February 20, 2014,March 22, 2019, File No. 1-6468, as Exhibit 4.4.4.5.)
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Table of ContentsIndex to Financial Statements
(c)8(c)7
Owners Consent to Assignment and DirectNote Purchase Agreement, and Amendment to Plant Alvin W. Vogtle Additional Units Ownership Participation Agreement by and among Georgia Power, OPC, MEAG Power, and Dalton dated as of February 20, 2014. (DesignatedMarch 22, 2019, between Georgia Power, the DOE, and the FFB. (Designated in Form 8-K dated February 20, 2014,March 22, 2019, File No. 1-6468, as Exhibit 4.5.4.2.)
(c)9Gulf
Promissory Note of Georgia Power,
(d)1
Senior Note Indenture dated as of January 1, 1998, between Gulf Power and Wells Fargo Bank, National Association, as Successor Trustee, and certain indentures supplemental thereto through May 18, 2017.March 22, 2019. (Designated in Form 8-K dated June 17, 1998,March 22, 2019, File No. 0-2429,1-6468, as Exhibit 4.14.3,.)
(c)10
Mississippi Power
(d)1(e)1
Senior Note Indenture dated as of May 1, 1998, between Mississippi Power and Wells Fargo Bank, National Association,Computershare Trust Company, N.A., as Successor Trustee, and certain indentures supplemental thereto through March 9, 2012.June 29, 2021. (Designated in Form 8-K dated May 14, 1998, File No. 001-11229, as Exhibit 4.1, in Form 8-K dated June 24, 2005, File No. 001-11229, as Exhibit 4.2, in Form 8-K dated March 3, 2009, File No. 001-11229, as Exhibit 4.2, in Form 8-K dated October 11, 2011, File No. 001-11229, as Exhibit 4.2(b), and in Form 8-K dated March 5, 2012, File No. 001-11229, as Exhibit 4.2(b), in Form 8-K dated March 22, 2018, File No. 001-11229, as Exhibit 4.2(b), in Form 8-K dated June 24, 2021, File No. 001-11229, as Exhibit 4.2(a), and in Form 8-K dated June 24, 2021, File No. 001-11229, as Exhibit 4.2(b).)
(d)2(e)2
Term Loan Agreement amongSenior Note Indenture dated as of June 1, 2023, between Mississippi Power and Regions Bank, as Trustee, and certain indentures supplemental thereto through June 28, 2023. (Designated in Form 10-Q for the lenders identified therein, datedquarter ended June 30, 2023, File No. 001-11229, as of March 8, 2016. (DesignatedExhibit 4(d)1, in Form 10-Q for the quarter ended March 31, 2016,June 30, 2023, File No. 001-11229, as Exhibit 4(e)1.4(d)2, and in Form 10-Q for the quarter ended June 30, 2023, file No. 001-11229, as Exhibit 4(d)3.)
Table of ContentsIndex to Financial Statements

Southern Power
(e)1Southern Power
(f)1
Senior Note Indenture dated as of June 1, 2002, between Southern Power Company and Wells Fargo Bank, National Association,Computershare Trust Company, N.A., as Successor Trustee, and certain indentures supplemental thereto through November 16, 2016.January 8, 2021. (Designated in Registration No. 333-98553 as Exhibit 4.1, in Form 8-K dated September 14, 2011, File No. 333-98553, as Exhibit 4.4, in Form 8-K dated July 10, 2013, File No. 333-98553, as Exhibit 4.4, in Form 8-K dated May 14, 2015, File No. 333-98553, as Exhibit 4.4(a), in Form 8-K dated May 14, 2015, File No. 333-98553, as Exhibit 4.4(b), in Form 8-K dated November 12, 2015, File No. 333-98553, as Exhibit 4.4(a), in Form 8-K dated June 13, 2016, File No. 001-37803, as Exhibit 4.4(a), in Form 8-K dated June 13, 2016, File No. 001-37803, as Exhibit 4.4(b), in Form 10-Q for the quarter ended September 30, 2016, File No. 001-37803, as Exhibit 4(f)1, in Form 10-Q for the quarter ended September 30, 2016, File No. 001-37803, as Exhibit 4(f)2, in Form 8-K dated November 10, 2016, File No. 001-37803, as Exhibit 4.4(a), in Form 8-K dated November 10, 2016, File No. 001-37803, as Exhibit 4.4(b), and in Form 8-K dated November 10, 2016, File No. 001-37803, as Exhibit 4.4(c), and in Form 8-K dated January 5, 2021, File No. 001-37803, as Exhibit 4.4.)
(e)2*(f)2
Southern Company Gas
(f)1(g)1
Indenture dated February 20, 2001 between AGL Capital Corporation, AGL Resources Inc., and The BankComputershare Trust Company, N.A., as Successor Trustee and First Supplemental Indenture thereto dated as of New York, as Trustee. September 9, 2021. (Designated in Form S-3, File No. 333-69500, as Exhibit 4.2.4.2, and in Form 8-K dated September 7, 2021, File No. 1-14174, as Exhibit 4.2.)
(f)2(g)2
Southern Company Gas Capital Corporation's 6.00% Senior Notes Notes due 2034, 5.25%5.875% Senior Notes due 2019, Form of 3.50% Senior Notes due 2021, 5.875% Senior Notes due 2041, Form of Series B4.40% Senior Notes due 2018, 4.40% Senior Notes due 2043, 3.875% Senior Notes Notes due 2025, 3.250% Senior Notes due 2026, Form of 2.450% Senior Note due October 1, 2023, Form of 3.950% Senior Note due October 1, 2046, and Form of Series 2017A 4.400% Senior Note due May 30, 2047.2047, Form of 2020A 1.750% Senior Note due January 15, 2031, Form of Series 2021A 3.15% Senior Note due September 30, 2051, Form of Series 2022A 5.15% Senior Note due September 30, 2032, and Form of Series 2023A 5.75% Senior Note due September 15, 2033. (Designated inForm 8-K dated September 22, 2004, File No. 1-14174, as Exhibit 4.1, in Form 8-K dated August 5, 2009, File No. 1-14174, as Exhibit 4.1, in Form 8-K dated September 15, 2011, File No. 1-14174, as Exhibit 4.1, in Form 8-K dated March 16, 2011, File No. 1-14174, as Exhibit 4.1, in Form 8-K dated August 31, 2011, File No. 1-14174, as Exhibit 4.2, in Form 8-K dated May 13, 2013, File No. 1-14174, as Exhibit 4.2, in Form 8-K dated November 13, 2015, File No. 1-14174, as Exhibit 4.2, in Form 8-K dated May 13, 2016, File No. 1-14174, as Exhibit 4.2, in Form 8-K dated September 8, 2016, File No. 1-14174, as Exhibit 4.1(a), in Form 8-K dated September 8, 2016, File No. 1-14174, as Exhibit 4.1(b), and in Form 8-K dated May 5, 2017, File No. 1-14174, as Exhibit 4.1, in Form 8-K dated August 17, 2020, File No. 1-14174, as Exhibit 4.1, in Form 8-K dated September 9, 2021, File No. 1-14174, as Exhibit 4.1, in Form 8-K dated September 6, 2022, File No. 1-14174, as Exhibit 4.1, and in Form 8-K dated September 11, 2023, File No. 1-14174, as Exhibit 4.1, respectively.)
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Table of ContentsIndex to Financial Statements
(f)3(g)3
Southern Company Gas' GuaranteeGuarantee related to the 6.00% Senior Notes due 2034,, Guarantee related to the 5.25% Senior Notes due 2019, Guarantee related to the 5.875% Senior Notes due 2041, Form of Guarantee related to the 3.50% Senior Notes due 2021, Guarantee related to the 4.40% Senior Notes due 2043, Guarantee related to the 3.875% Senior Notes due 2025, Guarantee related to the 3.250% Senior Notes due 2026, Form of Guarantee related to the 2.450% Senior Notes due October 1, 2023, Form of Guarantee related to the 3.950% Senior Notes due October 1, 2046, and Form of Guarantee related to the Series 2017A 4.400% Senior Notes due May 30, 2047.2047, Form of Guarantee related to the Series 2020A 1.750% Senior Notes due January 15, 2031, Form of Guarantee related to the Series 2021A 3.15% Senior Note due September 30, 2051, Form of Guarantee related to the Series 2022A 5.15% Senior Notes due September 30, 2032, and Form of Guarantee related to the Series 2023A 5.75% Senior Notes Due September 15, 2033. (Designated in in Form 8-K dated September 22, 2004, File No. 1-14174, as Exhibit 4.3, in Form 8-K dated March 16, 2011, File No. 1-14174, as Exhibit 4.24.1, in Form 8-K dated September 15, 2011, File No. 1-14174, as Exhibit 4.2, in Form 8-K dated May 13, 2013, File No. 1-14174, as Exhibit 4.3, in Form 8-K dated November 13, 2015, File No. 1-14174, as Exhibit 4.3, in Form 8-K dated May 13, 2016, File No. 1-14174, as Exhibit 4.3, in Form 8-K dated September 8, 2016, File No. 1-14174, as Exhibit 4.3(a), in Form 8-K dated September 8, 2016, File No. 1-14174, as Exhibit 4.3(b), and in Form 8-K dated May 5, 2017, File No. 1-14174, as Exhibit 4.3, in Form 8-K dated August 17, 2020, File No. 1-14174, as Exhibit 4.3, in Form 8-K dated September 9, 2021, File No. 1-14174, as Exhibit 4.3, in Form 8-K dated September 6, 2022, File No. 1-14174, as Exhibit 4.3, and in Form 8-K dated September 11, 2023, File No. 1-14174, as Exhibit 4.3,respectively.)
(f)4(g)4Indenture dated December 1, 1989 of Atlanta Gas Light Company and First Supplemental Indenture thereto dated March 16, 1992. (Designated in Form S-3, File No. 33-32274, as Exhibit 4(a) and in Form S-3, File No. 33-46419, as Exhibit 4(a).)
Table of ContentsIndex to Financial Statements

(f)5
(g)5
Indenture of Commonwealth Edison Company to Continental Illinois National Bank and Trust Company of Chicago, Trustee, dated as of January 1, 1954, Indenture of Adoption of Northern Illinois Gas Company to Continental Illinois National Bank and Trust Company of Chicago, Trustee, dated February 9, 1954, and certain indentures supplemental thereto. (Designated in Form 10-K for the year ended December 31, 1995, File No. 1-7296, as Exhibit 4.01, in Form 10-K for the year ended December 31, 1995, File No. 1-7296, as Exhibit 4.02, in Registration No. 2-56578 as Exhibits 2.21 and 2.25, in Form 10-Q for the quarter ended June 30, 1996, File No. 1-7296, as Exhibit 4.01, in Form 10-K for the year ended December 31, 1997, File No. 1-7296, as Exhibit 4.19, in Form 10-K for the year ended December 31, 2003, File No. 1-7296, as Exhibit 4.09, in Form 10-K for the year ended December 31, 2003, File No. 1-7296, as Exhibit 4.10, in Form 10-K for the year ended December 31, 2003, File No. 1-7296, as Exhibit 4.11, in Form 10-K for the year ended December 31, 2006, File No. 1-7296, as Exhibit 4.11, in Form 10-Q for the quarter ended September 30, 2008, File No. 1-7296, as Exhibit 4.01, in Form 10-Q for the quarter ended June 31, 2009, File No. 1-7296, as Exhibit 4.01, in Form 10-Q for the quarter ended September 30, 2012, File No. 1-7296, as Exhibit 4, and in Form 10-K for the year ended December 31, 2016, File No. 1-14174, as Exhibit 4(g)6, in Form 10-K for the year ended December 31, 2017, File No. 1-14174, as Exhibit 4(g)6, in Form 10-Q for the quarter ended September 30, 2018, File No. 1-14174, as Exhibit 4(g)1, in Form 10-K for the year ended December 31, 2019, File No. 1-14174, as Exhibit 4(f)6, in Form 10-K for the year ended December 31, 2020, File No. 1-14174, as Exhibit 4(f)6, in Form 10-Q for the quarter ended September 30, 2021, File No. 1-4174, as Exhibit 4(f)4, and in Form 10-Q for the quarter ended September 30, 2023, File No. 1-4174, as Exhibit 4(f)3.)
(10)*(g)6Material Contracts
Southern Company
(10)#(a)Material Contracts
1Southern Company
#(a)1
Southern Company 2011 Omnibus Incentive Compensation Plan effective May 25, 2011. (Designated in Form 8-K dated May 25, 2011, File No. 1-3526, as Exhibit 10.1.)
#(a)#2(a)2
Form of Stock Option Award Agreement for Executive Officers of Southern Company under the Southern Company Omnibus Incentive Compensation Plan. (Designated in Form 10-Q for the quarter ended March 31, 2011, File No. 1-3526, as Exhibit 10(a)3.)
#(a)#3(a)3
Deferred Compensation Plan for Outside Directors of The Southern Company, Amended and Restated effective JanuaryJune 1, 20082021 and First Amendment thereto effective Aprilas of June 1, 2015.2021. (Designated in Form 10-Q for the quarter ended June 30, 2021, File No. 1-3526, as Exhibit 10(a)2, and in Form 10-K for the year ended December 31, 2007,2021, File No. 1-3526, as Exhibit 10(a)325 and in Form 10-Q for the quarter ended June 30, 2015, File No. 1-3526, as Exhibit 10(a)2.)
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Table of ContentsIndex to Financial Statements
#(a)#   *4(a)4
#(a)#5(a)5
The Southern Company Supplemental Executive Retirement Plan, Amended and Restated effective June 30, 2016, and Amendment No. 1 thereto effective January 1, 2017.2017, Amendment No. 2 thereto effective January 1, 2018, Amendment No. 3 thereto effective April 1, 2018, Amendment No. 4 thereto effective December 4, 2018, Amendment No. 5 thereto effective January 1, 2019 and Amendment No. 6 thereto effective January 1, 2019. (Designated in Form 10-Q for the quarter ended June 30, 2016, File No. 1-3526, as Exhibit 10(a)1 and, in Form 10-K for the year ended December 31, 2016, File No. 13536,1-3526, as Exhibit 10(a)18, in Form 10-K for the year ended December 31, 2017, File No. 1-3526, as Exhibit 10(a)16, in Form 10-Q for the quarter ended March 31, 2018, File No. 1-3526, as Exhibit 10(a)1, in Form 10-K for the year ended December 31, 2018, File No. 1-3526, as Exhibit 10(a)23, in Form 10-K for the year ended December 31, 2018, File No. 1-3526, as Exhibit 10(a)24, and in Form 10-K for the year ended December 31, 2019, File No. 1-3526, as Exhibit 10(a)24.)
#(a)#6(a)6
The Southern Company Supplemental Benefit Plan, Amended and Restated effective as of June 30, 2016, and Amendment No. 1 thereto effective January 1, 2017.2017, Amendment No. 2 thereto effective January 1, 2018, Amendment No. 3 thereto effective April 1, 2018, Amendment No. 4 thereto dated December 14, 2018, Amendment No. 5 thereto effective January 1, 2019, Amendment No. 6 thereto effective January 1, 2019, Amendment No. 7 thereto effective June 30, 2016, and Amendment No. 8 thereto effective July 1, 2021. (Designated in Form 10-Q for the quarter ended June 30, 2016, File No. 1-3526, as Exhibit 10(a)2  and, in Form 10-K for the year ended December 31, 2016, File No. 13536,1-3526, as Exhibit 10(a)19, in Form 10-K for the year ended December 31, 2017, File No. 1-3526, as Exhibit 10(a)17, in Form 10-Q for the quarter ended March 31, 2018, File No. 1-3526, as Exhibit 10(a)2, in Form 10-K for the year ended December 31, 2018, File No. 1-3526, as Exhibit 10(a)25, in Form 10-K for the year ended December 31, 2018, File No. 1-3526, as Exhibit 10(a)26 in Form 10-K for the year ended December 31, 2019, File No. 1-3526, as Exhibit 10(a)23, in Form 10-K for the year ended December 31, 2020, File No. 1-3526, as Exhibit 10(a) 25, and in Form 10-Q for the quarter ended March 31, 2022, File No. 1-3526, as Exhibit 10(a)5.)
#(a)#7(a)7
TheAmended and Restated Southern Company Change in Control Benefits Protection Plan (an amendment and restatement of The Southern Company Change in Control Benefit Plan Determination Policy), effective December 31, 2008.August 15, 2022. (Designated in Form 8-K dated December 31, 2008,August 15, 2022, File No. 1-3526, as Exhibit 10.1.)
#(a)#8(a)8
Deferred Cash Compensation Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective January 1, 2001, between Wells Fargo Bank, N.A., as successor to Wachovia Bank, N.A.,Delaware Charter Guarantee & Trust Company, Southern Company, SCS, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Linc, Southern Company Energy Solutions, LLC, and Southern Nuclear and First Amendment thereto effective January 1, 2009. (Designated in Form 10-K for the year ended December 31, 2000, File No. 1-3526, as Exhibit 10(a)103 and in Form 10-K for the year ended December 31, 2008, File No. 1-3526, as Exhibit 10(a)16.)
#(a)#9(a)9
Amended and Restated Deferred Stock Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective January 1, 2000,December 16, 2020, by and between Reliance Trust Company, Southern Company Alabama Power, Georgia Power, Gulf Power, and Mississippi Power and First Amendment thereto effective January 1, 2009. (DesignatedDelaware Charter Guarantee & Trust Company. (Designated in Form 10-K for the year ended December 31, 2000,2020, File No. 1-3526, as Exhibit 10(a)1049 and in Form 10-K for the year ended December 31, 2008, File No. 1-3526, as Exhibit 10(a)18.)
Table of ContentsIndex to Financial Statements

#(a)10
#(a)10
Amended and Restated Deferred Cash Compensation Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective September 1, 2001,December 16, 2020, by and between Wells Fargo Bank, N.A., as successor to Wachovia Bank, N.A., Southern Company Alabama Power, Georgia Power, Gulf Power, and Mississippi Power and First Amendment thereto effective January 1, 2009. (DesignatedDelaware Charter Guarantee & Trust Company. (Designated in Form 10-K for the year ended December 31, 2001,2020, File No. 1-3526, as Exhibit 10(a)9210 and in Form 10-K for the year ended December 31, 2008, File No. 1-3526, as Exhibit 10(a)20.)
#(a)#11(a)11
Southern Company Senior Executive Change in Control Severance Plan, Amended and Restated effective December 31, 2008, First Amendment thereto effective October 19, 2009, and Second Amendment thereto effective February 22, 2011.August 15, 2022. (Designated in Form 10-K for the year ended December 31, 2008,8-K dated August 15, 2022, File No. 1-3526, as Exhibit 10(a)2310.2, in Form 10-K for the year ended December 31, 2009, File No. 1-3526, as Exhibit 10(a)22, and in Form 10-K for the year ended December 31, 2010, File No. 1-3526, as Exhibit 10(a)16.)
#(a)#12(a)12
Southern Company Executive Change in Control Severance Plan, Amended and Restated effective December 31, 2008 and First Amendment thereto effective January 1, 2010.August 15, 2022. (Designated in Form 10-K10-Q for the yearquarter ended December 31, 2008,September 30, 2022, File No. 1-3526, as Exhibit 10(a)243 and in Form 10-K for the year ended December 31, 2009, File No. 1-3526, as Exhibit 10(a)24.)
E-6

Table of ContentsIndex to Financial Statements
#(a)#13(a)13
Form of Terms for Performance ShareNamed Executive Officer Equity Awards grantedGranted under the Southern Company 2011 Omnibus2021 Equity and Incentive Compensation Plan. (Designated in Form 10-Q for the quarter ended March 31, 2017,2022, File No. 1-3526, as Exhibit 10(a)1).
#(a)#14(a)14
Outside Directors Stock Plan for The Southern Company and its Subsidiaries effective June 1, 2015. (Designated in Definitive Proxy Statement filed April 10, 2015, File No. 1-3526, as Appendix A.)
#(a)15
Deferred Compensation Agreement between Southern Company, SCS, Alabama Power, and Mark A. Crosswhite, effective July 30, 2008. (Designated in Form 10-K for the year ended December 31, 2016, File No. 1-3526, as Exhibit 10(a)17.)

##   *(a)(a)1516
(a)16#   *(a)17
(a)18
The Southern Company Employee Savings Plan, Amended and Restated effective January 1, 2018.2018, First Amendment thereto dated December 7, 2018, Second Amendment thereto dated January 29, 2019, Third Amendment thereto dated December 4, 2019, Fourth Amendment thereto dated November 27, 2020, Fifth Amendment thereto effective July 1, 2021, and Sixth Amendment thereto effective July 1, 2021. (Designated in Post-Effective Amendment No. 1 to Form S-8, File No. 333-212783 as Exhibit 4.3.)
#(a)19
#(a)20
Letter Agreement among Southern Company Gas, Southern Company, and Andrew W. Evans and Performance Stock Unit Award Agreement, dated September 29, 2016. (Designated, in Form 10-Q for the quarter ended March 31, 2017,2022, File No. 1-3526, as Exhibit 10(a)3, and in Form 10-K for the year ended December 31, 2022, File No. 1-3526, as Exhibit 10(a)17.)
*##(a)(a)1721
#(a)18
Deferred Compensation Plan.Agreement between Southern Company, SCS, Georgia Power, and Christopher C. Womack, effective December 10, 2008. (Designated in Form 10-Q for the quarter ended March 31, 2017,September 30, 2022, File No. 1-3526, as Exhibit 10(a)4.)
*#Alabama Power(a)19
#(a)20(b)
The Southern Company Equity and Incentive Compensation Plan, effective May 26, 2021. (Designated in Form 8-K dated May 26, 2021, File No. 1-3526, as Exhibit 10.1.)
Alabama Power
(b)1
Intercompany Interchange Contract as revised effective May 1, 2007, among Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power Company, and SCS.SCS and Appendix A thereto dated as of January 1, 2019. (Designated in Form 10-Q for the quarter ended March 31, 2007, File No. 1-3164, as Exhibit 10(b)5.)
#(b)2Southern Company 2011 Omnibus Incentive Compensation Plan effective May 25, 2011. See Exhibit 10(a)1 herein.
#(b)3 and in Form of Stock Option Award Agreement10-K for Executive Officers of Southern Company under the Southern Company Omnibus Incentive Compensation Plan. See Exhibit 10(a)2 herein.
#(b)4Southern Company Deferred Compensation Plan, Amended and Restated as of January 1, 2018. See Exhibit 10(a)4 herein.
#(b)5The Southern Company Supplemental Executive Retirement Plan, Amended and Restated effective June 30, 2016 and Amendment No. 1 thereto effective January 1, 2017. See Exhibit 10(a)5 herein.
Table of ContentsIndex to Financial Statements

#(b)6The Southern Company Supplemental Benefit Plan, Amended and Restated effective as of June 30, 2016 and Amendment No. 1 thereto effective January 1, 2017. See Exhibit 10(a)6 herein.
#(b)7Southern Company Executive Change in Control Severance Plan, Amended and Restated effectiveyear ended December 31, 2008 and First Amendment thereto effective January 1, 2010. See Exhibit 10(a)12 herein.
#(b)8
Deferred Compensation Plan for Outside Directors of Alabama Power Company, Amended and Restated effective January 1, 2008 and First Amendment thereto effective June 1, 2015. (Designated in Form 10-Q for the quarter ended June 30, 2008, File No. 1-3164, as Exhibit 10(b)1 and in Form 10-Q for the quarter ended June 30, 2015, File No. 1-3164, as Exhibit 10(b)1.)
#(b)9The Southern Company Change in Control Benefits Protection Plan (an amendment and restatement of The Southern Company Change in Control Benefit Plan Determination Policy), effective December 31, 2008. See Exhibit 10(a)7 herein.
#(b)10Deferred Cash Compensation Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective January 1, 2001, between Wells Fargo Bank, N.A., as successor to Wachovia Bank, N.A., Southern Company, SCS, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Linc, Southern Company Energy Solutions, LLC, and Southern Nuclear and First Amendment thereto effective January 1, 2009. See Exhibit 10(a)8 herein.
#(b)11Deferred Stock Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective January 1, 2000, between Reliance Trust Company, Southern Company, Alabama Power, Georgia Power, Gulf Power, and Mississippi Power and First Amendment thereto effective January 1, 2009. See Exhibit 10(a)9 herein.
#(b)12Deferred Cash Compensation Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective September 1, 2001, between Wells Fargo Bank, N.A., as successor to Wachovia Bank, N.A., Southern Company, Alabama Power, Georgia Power, Gulf Power, and Mississippi Power and First Amendment thereto effective January 1, 2009. See Exhibit 10(a)10 herein.
#(b)13Southern Company Senior Executive Change in Control Severance Plan, Amended and Restated effective December 31, 2008, First Amendment thereto effective October 19, 2009, and Second Amendment thereto effective February 22, 2011. See Exhibit 10(a)11 herein.
#(b)14Form of Terms for Performance Share Awards granted under the Southern Company 2011 Omnibus Incentive Compensation Plan. See Exhibit 10(a)13 herein.
#(b)15
Deferred Compensation Agreement between Southern Company, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, and SCS and Philip C. Raymond dated September 15, 2010. (Designated in Form 10-Q for the quarter ended September 30, 2010,2018, File No. 1-3164, as Exhibit 10(b)2.)
#(b)16Deferred Compensation Agreement between Southern Company, SCS, AlabamaGeorgia Power and Mark A. Crosswhite, effective July 30, 2008. See Exhibit 10(a)15 herein.
(c)1#(b)17Outside Directors Stock Plan for The Southern Company and its Subsidiaries effective June 1, 2015. See Exhibit 10(a)14 herein.
#(b)18Second Amendment to The Southern Company Supplemental Executive Retirement Plan effective January 1, 2018. See Exhibit 10(a)16 herein.
#(b)19Second Amendment to The Southern Company Supplemental Benefit Plan effective January 1, 2018. See Exhibit 10(a)17 herein.
#(b)20Form of Terms for Restricted Stock Unit with Performance Measure Awards granted under the Southern Company 2011 Omnibus Incentive Compensation Plan. See Exhibit 10(a)19 herein.
#(b)21Form of Time-Vesting Restricted Stock Unit Awards granted under the Southern Company 2011 Omnibus Incentive Compensation Plan. See Exhibit 10(a)21 herein.
Georgia Power
(c)1Intercompany Interchange Contract as revised effective May 1, 2007, among Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power Company, and SCS.SCS and Appendix A thereto dated as of January 1, 2019. See Exhibit 10(b)1 herein.
(c)2(c)2Revised and Restated Integrated Transmission System Agreement dated as of November 12, 1990, between Georgia Power and OPC. (Designated in Form 10-K for the year ended December 31, 1990, File No. 1-6468, as Exhibit 10(g).)
Table of ContentsIndex to Financial Statements

(c)3
(c)3Revised and Restated Integrated Transmission System Agreement between Georgia Power and Dalton dated as of December 7, 1990. (Designated in Form 10-K for the year ended December 31, 1990, File No. 1-6468, as Exhibit 10(gg).)
(c)4(c)4Revised and Restated Integrated Transmission System Agreement between Georgia Power and MEAG Power dated as of December 7, 1990. (Designated in Form 10-K for the year ended December 31, 1990, File No. 1-6468, as Exhibit 10(hh).)
(c)5(c)5
Interim Assessment Agreement dated as of March 29, 2017, by and among Georgia Power, for itself and as agent for Oglethorpe Power Corporation, Municipal Electric Authority of Georgia, and The City of Dalton, Georgia, acting by and through its Board of Water, Light and Sinking Fund Commissioners, and Westinghouse Electric Company LLC, WECTEC Staffing Services LLC, and WECTEC Global Project Services, Inc., Amendment 1 thereto dated as of April 28, 2017, Amendment 2 thereto dated as of May 12, 2017, Amendment 3 thereto dated as of June 3, 2017, Amendment 4 thereto dated as of June 5, 2017, Amendment 5 thereto dated as of March 29, 2017, Amendment 6 thereto dated as of June 22, 2017, Amendment 7 thereto dated as of June 28, 2017 and Amendment 8 thereto dated as of July 20, 2017. (Designated in Form 10-Q for the quarter ended March 31, 2017, File No. 1-6468, as Exhibit 10(c)3, in Form 10-Q for the quarter ended March 31, 2017, File No. 1-6468, as Exhibit 10(c)4, in Form 8-K dated May 12, 2017, File No. 1-6468, as Exhibit 10.1, in Form 8-K dated June 3, 2017, File No. 1-6468, as Exhibit 10.1, in Form 8-K dated June 5, 2017, File No. 1-6468, as Exhibit 10.1, in Form 8-K dated June 16, 2017, File No. 1-6468, as Exhibit 10.2, in Form 8-K dated June 22, 2017, File No. 1-6468, as Exhibit 10.1, in Form 8-K dated June 28, 2017, File No. 1-6468, as Exhibit 10.1, and in Form 8-K dated July 20, 2017, File No. 1-6468, as Exhibit 10.1.)
(c)6
Settlement Agreement dated as of June 9, 2017, by and among Georgia Power, OglethorpeOPC, MEAG Power, Corporation, Municipal Electric Authority of Georgia, The City of Dalton, Georgia, acting by and through its Board of Water, Light and Sinking Fund Commissioners, and Toshiba Corporation and Amendment No. 1 thereto dated as of December 8, 2017. (Designated in Form 8-K dated June 16, 2017, File No. 1-6468, as Exhibit 10.1 and in Form 8-K dated December 8, 2017, File No. 1-6468, as Exhibit 10.1.)

(c)6(c)7
Amended and Restated Services Agreement dated as of June 20, 2017, by and among Georgia Power, for itself and as agent for OglethorpeOPC, MEAG Power, Corporation, Municipal Electric Authority of Georgia, MEAG Power SPVJ, LLC, MEAG Power SPVM, LLC, MEAG Power SPVP, LLC, and The City of Dalton, acting by and through its Board of Water, Light and Sinking Fund Commissioners, and Westinghouse Electric Company LLC and WECTEC Global Project Services, Inc. (Georgia Power requested confidential treatment for(Pursuant to Item 601(b)(10) of Regulation S-K, certain portions ofidentified information has been omitted from this document pursuant to an application for confidential treatment sent toexhibit because it is both not material and is the SEC.type that Georgia Power omitted such portions from the filing and filed them separately with the SEC.treats as private or confidential.) (Designated inForm 10-Q for the quarter ended June 30, 2017, File No.8-K dated February 1, 2024, File No. 1-6468, as Exhibit 10(c)910.1.)
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Table of ContentsIndex to Financial Statements
(c)7*(c)8
Construction Completion Agreement dated as of October 23, 2017, between Georgia Power, for itself and as agent for OglethorpeOPC, MEAG Power, Corporation, Municipal Electric Authority of Georgia, MEAG Power SPVJ, LLC, MEAG Power SPVM, LLC, MEAG Power SPVP, LLC, and The City of Dalton, acting by and through its Board of Water, Light and Sinking Fund Commissioners, and Bechtel, Power Corporation.Amendment No. 1 thereto dated as of October 12, 2018, and Amendment No. 2 thereto dated as of November 8, 2019. (Georgia Power has requested confidential treatment for certain portions of this documentthese documents pursuant to an applicationapplications for confidential treatment sent to the SEC. Georgia Power omitted such portions from the filingfilings and filed them separately with the SEC.) (Designated in Form 10-K for the year ended December 31, 2017, File No. 1-6468, as Exhibit 10(c)8 and in Form 10-K for the year ended December 31, 2018, File No. 1-6468, as Exhibit 10(c)10, and in Form 10-K for the year ended December 31, 2019, File No. 1-6468, as Exhibit 10(c)8.)
(c)8(c)9
Plant Alvin W. Vogtle Additional Units Ownership Participation Agreement dated as of April 21, 2006, among Georgia Power, OglethorpeOPC, MEAG Power, Corporation, Municipal Electric Authority of Georgia, and The City of Dalton, Georgia, Amendment 1 thereto dated as of April 8, 2008, Amendment 2 thereto dated as of February 20, 2014, and Agreement Regarding Additional Participating Party Rights and Amendment 3 thereto dated as of November 2, 2017.2017, and First Amendment to Agreement Regarding Additional Participating Party Rights and Amendment No. 3 to Plant Alvin W. Vogtle Additional Units Ownership Participation Agreement, dated as of August 31, 2018. (Designated in Form 8-K dated April 21, 2006, File No. 33-7591, as Exhibit 10.4.4, in Form 10-K for the year ended December 31, 2013, File No. 000-53908, as Exhibit 10.3.2(a), in Form 10-K for the year ended December 31, 2013, File No. 000-53908, as Exhibit 10.3.2(b), and in Form 10-Q for the quarter ended September 30, 2017, File No. 000-53908, as Exhibit 10.1, and in Form 8-K dated August 31, 2018, File No. 1-6468, as Exhibit 10.1.)
(c)9Gulf
Global Amendments to Vogtle Additional Units Agreements, dated as of February 18, 2019, among Georgia Power, OPC, MEAG Power, MEAG Power SPVJ, LLC, MEAG Power SPVM, LLC, MEAG Power SPVP, LLC, and Dalton. (Designated in Form 10-K for the year ended December 31, 2018, File No. 1-6468, as Exhibit 10(c)12.)
Mississippi Power
(d)1(d)1Intercompany Interchange Contract as revised effective May 1, 2007, among Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power Company, and SCS.SCS and Appendix A thereto dated as of January 1, 2019. See Exhibit 10(b)1 herein.
(d)2Mississippi Power
(e)1Intercompany Interchange Contract as revised effective May 1, 2007, among Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power Company, and SCS. See Exhibit 10(b)1 herein.
Table of ContentsIndex to Financial Statements

(e)2Transmission Facilities Agreement dated February 25, 1982, Amendment No. 1 dated May 12, 1982 and Amendment No. 2 dated December 6, 1983, between Entergy Corporation (formerly Gulf States) and Mississippi Power. (Designated in Form 10-K for the year ended December 31, 1981, File No. 001-11229, as Exhibit 10(f), in Form 10-K for the year ended December 31, 1982, File No. 001-11229, as Exhibit 10(f)(2), and in Form 10-K for the year ended December 31, 1983, File No. 001-11229, as Exhibit 10(f)(3).)
#(e)3Southern Company 2011 Omnibus Incentive Compensation Plan effective May 25, 2011. See Exhibit 10(a)1 herein.Power
(e)1#(e)4Form of Stock Option Award Agreement for Executive Officers of Southern Company under the Southern Company Omnibus Incentive Compensation Plan. See Exhibit 10(a)2 herein.
#(e)5Southern Company Deferred Compensation Plan, Amended and Restated as of January 1, 2018. See Exhibit 10(a)4 herein.
#(e)6The Southern Company Supplemental Benefit Plan, Amended and Restated effective as of June 30, 2016 and Amendment No. 1 thereto effective January 1, 2017. See Exhibit 10(a)6 herein.
#(e)7Southern Company Executive Change in Control Severance Plan, Amended and Restated effective December 31, 2008 and First Amendment thereto effective January 1, 2010. See Exhibit 10(a)12 herein.
#(e)8The Southern Company Supplemental Executive Retirement Plan, Amended and Restated effective June 30, 2016 and Amendment No. 1 thereto effective January 1, 2017. See Exhibit 10(a)5 herein.
#(e)9
Deferred Compensation Plan for Outside Directors of Mississippi Power Company, Amended and Restated effective January 1, 2008 and First Amendment thereto effective April 1, 2015. (Designated in Form 10-Q for the quarter ended March 31, 2008, File No. 001-11229 as Exhibit 10(e)1 and in Form 10-Q for the quarter ended June 30, 2015, File No. 001-11229 as Exhibit 10(e)1.)
#(e)10The Southern Company Change in Control Benefits Protection Plan (an amendment and restatement of The Southern Company Change in Control Benefit Plan Determination Policy), effective December 31, 2008. See Exhibit 10(a)7 herein.
#(e)11Deferred Cash Compensation Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective January 1, 2001, between Wells Fargo Bank, N.A., as successor to Wachovia Bank, N.A., Southern Company, SCS, Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Linc, Southern Company Energy Solutions, LLC, and Southern Nuclear and First Amendment thereto effective January 1, 2009. See Exhibit 10(a)8 herein.
#(e)12Deferred Stock Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective January 1, 2000, between Reliance Trust Company, Southern Company, Alabama Power, Georgia Power, Gulf Power, and Mississippi Power and First Amendment thereto effective January 1, 2009. See Exhibit 10(a)9 herein.
#(e)13Deferred Cash Compensation Trust Agreement for Directors of Southern Company and its Subsidiaries, Amended and Restated effective September 1, 2001, between Wells Fargo Bank, N.A., as successor to Wachovia Bank, N.A., Southern Company, Alabama Power, Georgia Power, Gulf Power, and Mississippi Power and First Amendment thereto effective January 1, 2009. See Exhibit 10(a)10 herein.
#(e)14Southern Company Senior Executive Change in Control Severance Plan, Amended and Restated effective December 31, 2008, First Amendment thereto effective October 19, 2009, and Second Amendment thereto effective February 22, 2011. See Exhibit 10(a)11 herein.
(e)15
Cooperative Agreement between the DOE and SCS dated as of December 12, 2008. (Designated in Form 10-K for the year ended December 31, 2008, File No. 001-11229, as Exhibit 10(e)22.) (Mississippi Power requested confidential treatment for certain portions of this document pursuant to an application for confidential treatment sent to the SEC. Mississippi Power omitted such portions from this filing and filed them separately with the SEC.)
#(e)16Form of Terms for Performance Share Awards granted under the Southern Company 2011 Omnibus Incentive Compensation Plan. See Exhibit 10(a)13 herein.
#(e)17Outside Directors Stock Plan for The Southern Company and its Subsidiaries effective June 1, 2015. See Exhibit 10(a)14 herein.
#(e)18
Letter Agreement between Mississippi Power and Emile J. Troxclair III dated December 11, 2014. (Designated in Form 10-Q for the quarter ended March 31, 2016, File No. 001-11229, as Exhibit 10(e)1.)
Table of ContentsIndex to Financial Statements

#(e)19
Performance Award Agreement between Southern Company Services, Inc. and Emile J. Troxclair III effective as of January 3, 2015. (Designated in Form 10-Q for the quarter ended March 31, 2016, File No. 001-11229, as Exhibit 10(e)2.)
#(e)20Second Amendment to The Southern Company Supplemental Executive Retirement Plan effective January 1, 2018. See Exhibit 10(a)16 herein.
#(e)21Second Amendment to The Southern Company Supplemental Benefit Plan effective January 1, 2018. See Exhibit 10(a)17 herein.
#(e)22Form of Terms for Restricted Stock Unit with Performance Measure Awards granted under the Southern Company 2011 Omnibus Incentive Compensation Plan. See Exhibit 10(a)19 herein.
#(e)23Form of Time-Vesting Restricted Stock Unit Awards granted under the Southern Company 2011 Omnibus Incentive Compensation Plan. See Exhibit 10(a)21 herein.
Southern Power
(f)1Intercompany Interchange Contract as revised effective May 1, 2007, among Alabama Power, Georgia Power, Gulf Power, Mississippi Power, Southern Power Company, and SCS.SCS and Appendix A thereto dated as of January 1, 2019. See Exhibit 10(b)1 herein.
Southern Company Gas
(f)1(g)1
Note Purchase Agreement dated August 31, 2011. (Designated in Form 8-K dated August 31, 2011, File No. 1-14174, as Exhibit 10.1.)
(g)3
Final Allocation Agreement dated January 3, 2008. (Designated in Form 10-K for the year ended December 31, 2007, File No. 1-7296, as Exhibit 10.15.)
(g)4
Bank Rate Mode Covenants Agreement, dated as of February 26, 2013 and First Amendment to Bank Rate Mode Covenants Agreement dated as of October 30, 2015. (Designated in Form 8-K dated February 26, 2013, File No. 1-14174, as Exhibit 10.1 and in Form 8-K dated October 30, 2015, File No. 1-14174, as Exhibit 10.3.)
(14)(g)5
Loan Agreement dated as of February 1, 2013. (Designated in Form 8-K dated February 26, 2013, File No. 1-14174, as Exhibit 10.2.)
(g)6
Loan Agreement dated as of March 1, 2013. (Designated in Form 8-K dated March 25, 2013, File No. 1-14174, as Exhibit 10.1.)
(g)7
Amended and Restated Loan Agreement dated as of March 1, 2013. (Designated in Form 8-K dated March 25, 2013, File No. 1-14174, as Exhibit 10.2.)
(g)8
Amended and Restated Loan Agreement dated as of March 1, 2013. (Designated in Form 8-K dated March 25, 2013, File No. 1-14174, as Exhibit 10.3.)
(g)9
Amended and Restated Loan Agreement dated as of March 1, 2013. (Designated in Form 8-K dated March 25, 2013, File No. 1-14174, as Exhibit 10.4.)
(g)10
Asset Purchase Agreement, dated as of October 15, 2017, by and between Pivotal Utility Holdings, Inc., as Seller, and South Jersey Industries, Inc., as Buyer. (Designated in Form 8-K dated October 15, 2017, File No. 1-14174, as Exhibit 10.1.)
(14)Code of Ethics
Southern Company
(a)(a)
The Southern Company Code of Ethics. (Designated in Form 10-K for the year ended December 31, 2016, File No. 1-3526, as Exhibit 14(a).)
Alabama Power
(b)(b)The Southern Company Code of Ethics. See Exhibit 14(a) herein.
Georgia Power
(c)(c)The Southern Company Code of Ethics. See Exhibit 14(a) herein.
GulfMississippi Power
(d)(d)The Southern Company Code of Ethics. See Exhibit 14(a) herein.
MississippiSouthern Power
(e)(e)The Southern Company Code of Ethics. See Exhibit 14(a) herein.
E-8

Table of ContentsIndex to Financial Statements
Southern Company Gas
(f)Southern Power
(f)The Southern Company Code of Ethics. See Exhibit 14(a) herein.
Table of ContentsIndex to Financial Statements

(21)Southern Company Gas
(g)The Southern Company Code of Ethics. See Exhibit 14(a) herein.
(21)Subsidiaries of Registrants
Southern Company
*(a)*(a)
Alabama Power
(b)Subsidiaries of Registrant. See Exhibit 21(a) herein.
Georgia Power
Omitted pursuant to General Instruction I(2)(b) of Form 10-K.
GulfGeorgia Power
Omitted pursuant to General Instruction I(2)(b) of Form 10-K.
Mississippi Power
(e)Subsidiaries of Registrant. See Exhibit 21(a) herein.
Southern Power
Omitted pursuant to General Instruction I(2)(b) of Form 10-K.
Southern Company GasPower
Omitted pursuant to General Instruction I(2)(b) of Form 10-K10-K.
Southern Company Gas
Omitted pursuant to General Instruction I(2)(b) of Form 10-K.
(23)Consents of Experts and Counsel
Southern Company
*(a)*(a)1
Alabama Power
*(b)*(b)1
Georgia Power
*(c)*(c)
Mississippi Power
*1(d)
GulfSouthern Power
*(e)*(d)1
Mississippi PowerSouthern Company Gas
*(f)*(e)1
*(f)Southern Power
*(f)1
Southern Company Gas
(24)*(g)1
*(g)2
*(g)3
(24)Powers of Attorney and Resolutions
Southern Company
*(a)*1(a)
Alabama Power
*(b)*1(b)
Georgia Power
*(c)*1(c)
Mississippi Power
*(d)1
Southern Power
*(e)1
Southern Company Gas
*(f)1
E-9

Table of ContentsIndex to Financial Statements

(31)
Gulf Power
*(d)
Mississippi Power
*(e)
Southern Power
*(f)
Southern Company Gas
*(g)
(31)Section 302 Certifications
Southern Company
*(a)*1(a)1
*(a)*2(a)2
Alabama Power
*(b)*1(b)1
*(b)*2(b)2
Georgia Power
*(c)*1(c)1
*(c)*2(c)2
GulfMississippi Power
*(d)*1(d)1
*(d)2
Mississippi Power
*(e)1
*(d)*2(e)2
Southern Power
*(e)*1(f)1
*(e)*2(f)2
Southern Company Gas
*(f)*1(g)1
*(f)*2(g)2
(32)Section 906 Certifications
Southern Company
*(a)*(a)
Alabama Power
*(b)*(b)
Table of ContentsIndex to Financial Statements

Georgia Power
*(c)Georgia Power
*(c)
GulfMississippi Power
*(d)*(d)
Mississippi Power
*(e)
Southern Power
*(e)*(f)
Southern Company Gas
*(f)*(g)
E-10

Table of ContentsIndex to Financial Statements
(97)Policy Relating to Recovery of Erroneously Awarded Compensation
(99)Additional ExhibitsSouthern Company
*(a)
*(g)
Georgia Power
(101)(c)XBRL-Related DocumentsThe Southern Company and Covered Subsidiaries Compensation Recoupment Policy, effective December 1, 2023. See Exhibit 97(a) herein.
Southern Power
(e)*The Southern Company and Covered Subsidiaries Compensation Recoupment Policy, effective December 1, 2023. See Exhibit 97(a) herein.
(101)INSInteractive Data Files
*INSXBRL Instance Document – The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document.
*SCH*SCHXBRL Taxonomy Extension Schema Document
*CAL*CALXBRL Taxonomy Calculation Linkbase Document
*DEF*DEFXBRL Definition Linkbase Document
*LAB*LABXBRL Taxonomy Label Linkbase Document
*PRE*PREXBRL Taxonomy Presentation Linkbase Document
(104)Cover Page Interactive Data File
*Formatted as inline XBRL with applicable taxonomy extension information contained in Exhibits 101.
E-11

Table of ContentsIndex to Financial Statements

THE SOUTHERN COMPANY
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signature of the undersigned company shall be deemed to relate only to matters having reference to such company and any subsidiaries thereof.
THE SOUTHERN COMPANY
By:Christopher C. Womack
By:Thomas A. Fanning
Chairman, President, and
Chief Executive Officer
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date:February 20, 201814, 2024
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. The signature of each of the undersigned shall be deemed to relate only to matters having reference to the above-named company and any subsidiaries thereof.
 
Christopher C. Womack
Thomas A. Fanning
Chairman, President, and

Chief Executive Officer

(Principal Executive Officer)
Art P. Beattie
Daniel S. Tucker
Executive Vice President and Chief Financial Officer

(Principal Financial Officer)
AnnDavid P. Daiss
Poroch
Comptroller and Chief Accounting Officer

(Principal Accounting Officer)
Directors:
Juanita Powell Baranco
Jon A. BosciaJanaki Akella
Henry A. Clark III
Shantella E. Cooper
Anthony F. Earley, Jr.
David J. Grain
Veronica M. Hagen
Warren A. Hood, Jr.
Linda P. Hudson

Donald M. James
John D. Johns
Dale E. Klein
David E. Meador
Ernest J. Moniz
William G. Smith, Jr.
Steven R. SpeckerKristine L. Svinicki
Larry D. ThompsonLizanne Thomas
E. Jenner Wood III

By:
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date: February 20, 201814, 2024





Table of ContentsIndex to Financial Statements

ALABAMA POWER COMPANY
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signature of the undersigned company shall be deemed to relate only to matters having reference to such company and any subsidiaries thereof.
ALABAMA POWER COMPANY
By:J. Jeffrey Peoples
By:Mark A. Crosswhite
Chairman, President, and Chief Executive Officer
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date:February 20, 201814, 2024
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. The signature of each of the undersigned shall be deemed to relate only to matters having reference to the above-named company and any subsidiaries thereof.
 
J. Jeffrey Peoples
Mark A. Crosswhite
Chairman, President, and Chief Executive Officer

(Principal Executive Officer)
Philip C. Raymond
Moses H. Feagin
Executive Vice President, Chief Financial Officer, and Treasurer

(Principal Financial Officer)
Anita Allcorn-Walker
Senior Vice President and Comptroller

(Principal Accounting Officer)
Directors:
Whit Armstrong
David J.Angus R. Cooper, Sr.III
O. B. Grayson Hall, Jr.
Anthony A. Joseph
Patricia M. King

James K. Lowder
Robert D. PowersBarbara J. Knight
Catherine J. Randall
C. Dowd RitterKevin B. Savoy
R. Mitchell Shackleford, III
Charisse D. Stokes
Phillip M. Webb
By:
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date: February 20, 201814, 2024




Supplemental Information to be Furnished with Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act:

Alabama Power is not required to send an annual report or proxy statement to its sole shareholder and parent company, The Southern Company, and will not prepare such a report after filing this Annual Report on Form 10-K for fiscal year 2023. Accordingly, Alabama Power will not file an annual report with the Securities and Exchange Commission.


Table of ContentsIndex to Financial Statements

GEORGIA POWER COMPANY
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signature of the undersigned company shall be deemed to relate only to matters having reference to such company and any subsidiaries thereof.
GEORGIA POWER COMPANY
By:Kimberly S. Greene
By:W. Paul Bowers
Chairman, President, and Chief Executive Officer
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date:February 20, 201814, 2024
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. The signature of each of the undersigned shall be deemed to relate only to matters having reference to the above-named company and any subsidiaries thereof.
 
Kimberly S. Greene
W. Paul Bowers
Chairman, President, and Chief Executive Officer

(Principal Executive Officer)
Xia Liu
Executive Vice President, Chief Financial Officer,
and Treasurer
(Principal Financial Officer)
Aaron P. Abramovitz
David P. Poroch
Comptroller and Vice President
(Principal Accounting Officer)
Directors:
Mark L. Burns
Shantella E. Cooper
Lawrence L. Gellerstedt III
Stephen S. Green
Douglas J. Hertz
Kessel D. Stelling, Jr.
Jimmy C. Tallent
Charles K. Tarbutton
Beverly Daniel Tatum
Clyde C. Tuggle
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date: February 20, 2018



Table of ContentsIndex to Financial Statements

GULF POWER COMPANY
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signature of the undersigned company shall be deemed to relate only to matters having reference to such company and any subsidiaries thereof.
GULF POWER COMPANY
By:S. W. Connally, Jr.
Chairman, President, and Chief Executive Officer
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date:February 20, 2018
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. The signature of each of the undersigned shall be deemed to relate only to matters having reference to the above-named company and any subsidiaries thereof.

S. W. Connally, Jr.
Chairman, President, and Chief Executive Officer
(Principal Executive Officer)
Robin B. Boren
Vice President, Chief Financial Officer, and Treasurer

(Principal Financial and Accounting Officer)
PaulAdam D. Trippe
Houston
Vice President and Comptroller

(Principal Accounting Officer)
Directors:
Mark L. Burns
Jill Campbell
Andrew W. Evans
Steven R. Ewing
Thomas M. Holder
Kessel D. Stelling, Jr.
Charles K. Tarbutton
Clyde C. Tuggle
Directors:
Allan G. BenseJ. Mort O'Sullivan, III
Deborah H. CalderMichael T. Rehwinkel
William C. Cramer, Jr.Winston E. Scott
Julian B. MacQueen
By:
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)

Date: February 14, 2024
Date: February 20, 2018



Supplemental Information to be Furnished with Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act:

Gulf Power Company is not required to send an annual report or proxy statement to its sole shareholder and parent company, The Southern Company, and will not prepare such a report after filing this Annual Report on Form 10-K for fiscal year 2017. Accordingly, Gulf Power Company will not file an annual report with the Securities and Exchange Commission.





MISSISSIPPI POWER COMPANY
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signature of the undersigned company shall be deemed to relate only to matters having reference to such company and any subsidiaries thereof.
MISSISSIPPI POWER COMPANY
By:Anthony L. Wilson
Chairman, President, and Chief Executive Officer
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date:February 20, 201814, 2024
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. The signature of each of the undersigned shall be deemed to relate only to matters having reference to the above-named company and any subsidiaries thereof.
Anthony L. Wilson
Chairman, President, and Chief Executive Officer

(Principal Executive Officer)
Moses H. Feagin
Matthew P. Grice
Vice President, Treasurer, and
Chief Financial Officer
(Principal Financial Officer)
Cynthia F. Shaw
Pascal B. Gill
Comptroller

(Principal Accounting Officer)
Directors:
Augustus Leon Collins
Thomas M. Duff
Mary S. Graham
Directors:
Carl J. ChaneyChristine L. Pickering
L. Royce CumbestPhillip J. Terrell
Mark E. Keenum
Kari R. Wilkinson
Camille Scales Young
M.L. Waters
By:
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date: February 20, 201814, 2024




Supplemental Information to be Furnished with Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act:

Mississippi Power is not required to send an annual report or proxy statement to its sole shareholder and parent company, The Southern Company, and will not prepare such a report after filing this Annual Report on Form 10-K for fiscal year 2023. Accordingly, Mississippi Power will not file an annual report with the Securities and Exchange Commission.





SOUTHERN POWER COMPANY
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signature of the undersigned company shall be deemed to relate only to matters having reference to such company and any subsidiaries thereof.
SOUTHERN POWER COMPANY
By:Christopher Cummiskey
By:Joseph A. Miller
Chairman President and Chief Executive Officer
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date:February 20, 201814, 2024
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. The signature of each of the undersigned shall be deemed to relate only to matters having reference to the above-named company and any subsidiaries thereof.
Christopher Cummiskey
Joseph A. Miller
Chairman President, and Chief Executive Officer

(Principal Executive Officer)
William C. Grantham
Gary Kerr
Senior Vice President, Chief Financial Officer, and Treasurer

(Principal Financial Officer)
Elliott L. Spencer
ComptrollerJelena Andrin
Vice President and Corporate Secretary
Comptroller
(Principal Accounting Officer)
Directors:
Bryan D. Anderson
Stan W. Connally
Martin B. Davis
Sloane N. Drake
Directors:
Art P. Beattie
James Y. Kerr, II
Thomas
Sterling A. Fanning
MarkSpainhour
Daniel S. Lantrip
Kimberly S. GreeneTucker
Christopher C. Womack
By:
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date: February 20, 201814, 2024






SOUTHERN COMPANY GAS
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. The signature of the undersigned company shall be deemed to relate only to matters having reference to such company and any subsidiaries thereof.
SOUTHERN COMPANY GAS
By:James Y. Kerr II
By:Andrew W. Evans
Chairman, President, and Chief Executive Officer
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date:February 20, 201814, 2024
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. The signature of each of the undersigned shall be deemed to relate only to matters having reference to the above-named company and any subsidiaries thereof.
James Y. Kerr II
Andrew W. Evans
Chairman, President, and Chief Executive Officer

(Principal Executive Officer)
Elizabeth W. Reese
Grace A. Kolvereid
Executive Vice President, Chief Financial Officer, and Treasurer

(Principal Financial Officer)
Grace A. Kolvereid
Sarah P. Adams
Senior Vice President and Comptroller

(Principal Accounting Officer)
Directors:
Sandra N. Bane
Kimberly S. Greene
Thomas D. Bell, Jr.
Brenda J. Gaines
Bradley J. Henderson
Norman G. Holmes
J. Bret Lane
John E. Rau
Eric S. Smith
Charles R. CrispJames A. Rubright
Brenda J. Gaines
By:
By:/s/Melissa K. Caen
(Melissa K. Caen, Attorney-in-fact)
Date: February 20, 201814, 2024




Supplemental Information to be Furnished with Reports Filed Pursuant to Section 15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act:


Southern Company Gas is not required to send an annual report or proxy statement to its sole shareholder and parent company, The Southern Company, and will not prepare such a report after filing this Annual Report on Form 10-K for fiscal year 2017.2023. Accordingly, Southern Company Gas will not file an annual report with the Securities and Exchange Commission.