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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 10-Q
☒    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended September 30, 20212022

or

☐    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                    to                    

lnt-20220930_g1.jpg

Name of Registrant, State of Incorporation, Address of Principal Executive Offices, Telephone Number, Commission File Number, IRS Employer Identification Number

ALLIANT ENERGY CORPORATION
(a Wisconsin Corporation)
4902 N. Biltmore Lane
Madison, Wisconsin 53718
Telephone (608) 458-3311
Commission File Number - 1-9894
IRS Employer Identification Number - 39-1380265

INTERSTATE POWER & LIGHT COMPANY
(an Iowa corporation)
Alliant Energy Tower
Cedar Rapids, Iowa 52401
Telephone (319) 786-4411
Commission File Number - 1-4117
IRS Employer Identification Number - 42-0331370

WISCONSIN POWER & LIGHT COMPANY
(a Wisconsin corporation)
4902 N. Biltmore Lane
Madison, Wisconsin 53718
Telephone (608) 458-3311
Commission File Number - 0-337
IRS Employer Identification Number - 39-0714890
This combined Form 10-Q is separately filed by Alliant Energy Corporation, Interstate Power and Light Company and Wisconsin Power and Light Company. Information contained in the Form 10-Q relating to Interstate Power and Light Company and Wisconsin Power and Light Company is filed by each such registrant on its own behalf. Each of Interstate Power and Light Company and Wisconsin Power and Light Company makes no representation as to information relating to registrants other than itself.

Securities registered pursuant to Section 12(b) of the Act:
Alliant Energy Corporation, Common Stock, $0.01 Par Value, Trading Symbol LNT, Nasdaq Global Select Market
Interstate Power and Light Company, 5.100% Series D Cumulative Perpetual Preferred Stock, $0.01 Par Value, Trading Symbol IPLDP, Nasdaq Global Select Market

Indicate by check mark whether the registrant (1) has 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 registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
Alliant Energy Corporation - Yes ☒ No ☐
Interstate Power and Light Company - Yes ☒ No ☐
Wisconsin Power and Light Company - Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).
Alliant Energy Corporation - Yes ☒ No ☐
Interstate Power and Light Company - Yes ☒ No ☐
Wisconsin Power and Light Company - Yes ☒ No ☐
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.
Alliant Energy Corporation - Large Accelerated Filer ☒ Accelerated Filer ☐ Non-accelerated Filer ☐ Smaller Reporting Company ☐ Emerging Growth Company ☐
Interstate Power and Light Company - Large Accelerated Filer ☐ Accelerated Filer ☐ Non-accelerated Filer ☒ Smaller Reporting Company ☐ Emerging Growth Company ☐
Wisconsin Power and Light Company - Large Accelerated Filer ☐ Accelerated Filer ☐ Non-accelerated Filer ☒ Smaller Reporting Company ☐ Emerging Growth Company ☐

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.
Alliant Energy Corporation ☐
Interstate Power and Light Company ☐
Wisconsin Power and Light Company ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
Alliant Energy Corporation - Yes ☐ No ☒
Interstate Power and Light Company - Yes ☐ No ☒
Wisconsin Power and Light Company - Yes ☐ No ☒
Number of shares outstanding of each class of common stock as of September 30, 2021:2022:
Alliant Energy Corporation, Common Stock, $0.01 par value, 250,360,787 251,021,830 shares outstanding
Interstate Power and Light Company, Common Stock, $2.50 par value, 13,370,788 shares outstanding (all outstanding shares are owned beneficially and of record by Alliant Energy Corporation)
Wisconsin Power and Light Company, Common Stock, $5 par value, 13,236,601 shares outstanding (all outstanding shares are owned beneficially and of record by Alliant Energy Corporation)



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DEFINITIONS
The following abbreviations or acronyms used in this report are defined below:
Abbreviation or AcronymDefinitionAbbreviation or AcronymDefinition
20202021 Form 10-KCombined Annual Report on Form 10-K filed by Alliant Energy, IPL and WPL for the year ended Dec. 31, 2020GAAPU.S. generally accepted accounting principles
AEFAlliant Energy Finance, LLC2021IPLInterstate Power and Light Company
AFUDCAEFAllowance for funds used during constructionAlliant Energy Finance, LLCIUBIowa Utilities Board
Alliant EnergyAFUDCAlliant Energy CorporationAllowance for funds used during constructionMDAManagement’s Discussion and Analysis of Financial Condition and Results of Operations
ATCAlliant EnergyAmerican Transmission Company LLCAlliant Energy CorporationMISOMidcontinent Independent System Operator, Inc.
ATCAmerican Transmission Company LLCMWMegawatt
ATC HoldingsInterest in American Transmission Company LLC and ATC Holdco LLCMWMWhMegawattMegawatt-hour
Corporate ServicesAlliant Energy Corporate Services, Inc.MWhMegawatt-hour
COVID-19Novel coronavirusN/ANot applicable
DAECDuane Arnold Energy CenterNote(s)Combined Notes to Condensed Consolidated Financial Statements
DthDekathermOPEBOther postretirement benefits
EGUElectric generating unitPPAPurchased power agreement
EPAU.S. Environmental Protection AgencyPSCWPublic Service Commission of Wisconsin
EPSEarnings per weighted average common shareSECSecurities and Exchange Commission
Federal Tax ReformFERCTax Cuts and Jobs ActFederal Energy Regulatory CommissionU.S.United States of America
FERCFinancial StatementsFederal Energy Regulatory CommissionCondensed Consolidated Financial StatementsWest RiversideWest Riverside Energy Center
Financial StatementsFTRCondensed Consolidated Financial Statementstransmission rightWhiting PetroleumWhiting Petroleum Corporation
FTRGAAPFinancial transmission rightU.S. generally accepted accounting principlesWPLWisconsin Power and Light Company

FORWARD-LOOKING STATEMENTS

Statements contained in this report that are not of historical fact are forward-looking statements intended to qualify for the safe harbors from liability established by the Private Securities Litigation Reform Act of 1995. These forward-looking statements can be identified as such because the statements include words such as “may,” “believe,” “expect,” “anticipate,” “plan,” “project,” “will,” “projections,” “estimate,” or other words of similar import. Similarly, statements that describe future financial performance or plans or strategies are forward-looking statements. Such forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, such statements. Some, but not all, of the risks and uncertainties of Alliant Energy, IPL and WPL that could materially affect actual results include:

the direct or indirect effects resulting from the COVID-19 pandemic,terrorist incidents, including vaccine mandatesphysical attacks and testing requirements, on sales volumes, margins, operations, employees, contractors, vendors, the abilitycyber attacks, or responses to complete construction projects, supply chains, customers’ inability to pay bills, suspension of disconnects, the market value of the assets that fund pension plans and the potential for additional funding requirements, the ability of counterparties to meet their obligations, compliance with regulatory requirements, the ability to implement regulatory plans, economic conditions and access to capital markets;such incidents;
the impact of penalties or third-party claims related to, or in connection with, a failure to maintain the security of personally identifiable information, including associated costs to notify affected persons and to mitigate their information security concerns;
the direct or indirect effects resulting from terrorist incidents, including physical attacks and cyber attacks, or responses to such incidents;
the impact of customer- and third party-owned generation, including alternative electric suppliers, in IPL’s and WPL’s service territories on system reliability, operating expenses and customers’ demand for electricity;
the impact of energy efficiency, franchise retention and customer disconnects on sales volumes and margins;
the impact that price changes may have on IPL’s and WPL’s customers’ demand for electric, gas and steam services and their ability to pay their bills;
inflation and higher interest rates;
changes in the price of delivered natural gas, transmission, purchased electricity and coal, particularly during elevated market prices, and any resulting changes to counterparty credit risk, due to shifts in supply and demand caused by market conditions, regulations and MISO’s seasonal resource adequacy process;
IPL’s and WPL’s ability to obtain adequate and timely rate relief to allow for, among other things, the recovery of and/or the return on costs, including fuel costs, operating costs, transmission costs, deferred expenditures, deferred tax assets, tax expense, capital expenditures, and remaining costs related to EGUs that may be permanently closed and certain other retired assets, decreases in sales volumes, earning their authorized rates of return, and the payments to their parent of expected levels of dividends;
the ability to complete construction of renewable generation and storage projects by planned in-service dates and within the cost targets set by regulators due to cost increases of and access to materials, equipment and commodities including due to tariffs, duties or other assessments, such as any additional tariffs resulting from U.S. Department of Commerce investigations into the sourcing of solar project materials and equipment from certain countries, labor issues or supply shortages, the ability to successfully resolve warranty issues or contract disputes, the ability to achieve the expected level of tax benefits based on tax guidelines and project costs, and the ability to efficiently utilize the renewable generation and storage project tax benefits for the benefit of customers;
federal and state regulatory or governmental actions, including the impact of legislation, and regulatory agency orders;
the ability to utilize tax credits and net operating losses generated to date, and those that may be generated in the future, before they expire;expire, as well as the ability to transfer tax credits that may be generated in the future at adequate pricing;
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the impacts of changes in the tax code, including tax rates, minimum tax rates, and adjustments made to deferred tax assets and liabilities;
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employee workforce factors, including changes in key executives,the ability to hire and retain employees with specialized skills, impacts from employee retirements, changes in key executives, ability to create desired corporate culture, collective bargaining agreements and negotiations, work stoppages or restructurings;
disruptions in the supply and delivery of natural gas, purchased electricity and coal;
changes to the creditworthiness of, or performance of obligations by, counterparties with which Alliant Energy, IPL and WPL have contractual arrangements, including participants in the energy markets and fuel suppliers and transporters;
any material post-closing paymentspayments related to any past asset divestitures, including the sale of Whiting Petroleum, which could result from, among other things, indemnification agreements, warranties, guarantees or litigation;
weather effects on results of utility operations;
disruptions to ongoing operations and the supply of materials, services, equipment and commodities needed to construct solar generation, battery storage and electric and gas distribution projects, which may result from geopolitical issues, supplier manufacturing constraints, labor issues or transportation issues, as well as affect the ability to meet capacity requirements and result in increased capacity expense;
continued access to the capital markets on competitive terms and rates, and the actions of credit rating agencies;
the direct or indirect effects resulting from the ongoing novel coronavirus (COVID-19) pandemic and the spread of variant strains;
issues associated with environmental remediation and environmental compliance, including compliance with all environmental and emissions permits, the Coal Combustion Residuals Rule, future changes in environmental laws and regulations, including federal, state or local regulations for carbon dioxide emissions reductions from new and existing fossil-fueled EGUs, and litigation associated with environmental requirements;
increased pressure from customers, investors and other stakeholders to more rapidly reduce carbon dioxide emissions;
the ability to defend against environmental claims brought by state and federal agencies, such as the EPA, state natural resources agencies or third parties, such as the Sierra Club, and the impact on operating expenses of defending and resolving such claims;
continued accesschanges to the capital markets on competitive termsMISO’s methodology establishing capacity planning reserve margin and rates,capacity accreditation requirements that may impact how and the actions of credit rating agencies;
inflationwhen new generating facilities such as IPL’s and interest rates;
the ability to complete construction ofWPL’s additional solar generation projects withinmay be accredited with energy capacity and may require IPL and WPL to adjust their current resource plans, the cost targets set by regulators dueneed to cost increases of materials, equipment and commodities including dueadd resources to tariffs, labor issuescomply with MISO’s methodology, or supply shortages, the ability to achieve the expected level of tax benefits based on tax guidelines and project costs, and the ability to efficiently utilize the solar generation project tax benefits for the benefit of customers;
disruptions to the supply of materials, equipment and commodities needed to construct solar generation projects, including due to shortages, labor issues or transportation issues, which may impact the ability to meetprocure capacity requirements and result in increased capacity expense;
changes in the price of delivered natural gas, transmission, purchased electricity and coal due to shiftsmarket whereby such costs might not be recovered in supply and demand caused by market conditions and regulations;
disruptions in the supply and delivery of natural gas, purchased electricity and coal;rates;
the direct or indirect effects resulting from breakdown or failure of equipment in the operation of electric and gas distribution systems, such as mechanical problems and explosions or fires, and compliance with electric and gas transmission and distribution safety regulations, including regulations promulgated by the Pipeline and Hazardous Materials Safety Administration;
issues related to the availability and operations of EGUs, including start-up risks, breakdown or failure of equipment, availability of warranty coverage for equipment breakdowns or failures, performance below expected or contracted levels of output or efficiency, operator error, employee safety, transmission constraints, compliance with mandatory reliability standards and risks related to recovery of resulting incremental operating, fuel-related and capital costs through rates;
impacts that excessive heat, excessive cold, storms or natural disasters may have on Alliant Energy’s, IPL’s and WPL’s operations and recovery of costs associated with restoration activities or on the operations of Alliant Energy’s investments;
Alliant Energy’s ability to sustain its dividend payout ratio goal;
changes to costs of providing benefits and related funding requirements of pension and OPEB plans due to the market value of the assets that fund the plans, economic conditions, financial market performance, interest rates, timing and form of benefits payments, life expectancies and demographics;
material changes in employee-related benefit and compensation costs;costs, including settlement losses related to pension plans;
risks associated with operation and ownership of non-utility holdings;
changes in technology that alter the channels through which customers buy or utilize Alliant Energy’s, IPL’s or WPL’s products and services;
impacts on equity income from unconsolidated investments from changes in valuations andof the assets held, as well as potential changes to ATC’s authorized return on equity;
impacts of IPL’s future tax benefits from Iowa rate-making practices, including deductions for repairs expenditures, allocation of mixed service costs and state depreciation, and recoverability of the associated regulatory assets from customers, when the differences reverse in future periods;
changes to the creditworthiness of counterparties with which Alliant Energy, IPL and WPL have contractual arrangements, including participants in the energy markets and fuel suppliers and transporters;
current or future litigation, regulatory investigations, proceedings or inquiries;
reputational damage from negative publicity, protests, fines, penalties and other negative consequences resulting in regulatory and/or legal actions;
the effect of accounting standards issued periodically by standard-setting bodies;
the ability to successfully complete tax audits and changes in tax accounting methods with no material impact on earnings and cash flows; and
other factors listed in MDA and Risk Factors in Item 1A in the 20202021 Form 10-K.

Alliant Energy, IPL and WPL each assume no obligation, and disclaim any duty, to update the forward-looking statements in this report, except as required by law.
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PART I. FINANCIAL INFORMATION
ITEM 1. CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)
ALLIANT ENERGY CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
For the Three MonthsFor the Nine MonthsFor the Three MonthsFor the Nine Months
Ended September 30,Ended September 30,Ended September 30,Ended September 30,
20212020202120202022202120222021
(in millions, except per share amounts)(in millions, except per share amounts)
Revenues:Revenues:Revenues:
Electric utilityElectric utility$939$852$2,357$2,257Electric utility$1,039$939$2,624$2,357
Gas utilityGas utility5042289253Gas utility6250418289
Other utilityOther utility13103632Other utility11133536
Non-utilityNon-utility22166057Non-utility23227060
Total revenuesTotal revenues1,0249202,7422,599Total revenues1,1351,0243,1472,742
Operating expenses:Operating expenses:Operating expenses:
Electric production fuel and purchased powerElectric production fuel and purchased power207179478527Electric production fuel and purchased power274207633478
Electric transmission serviceElectric transmission service148132403326Electric transmission service157148428403
Cost of gas soldCost of gas sold1811149117Cost of gas sold2618242149
Other operation and maintenanceOther operation and maintenance171143477465Other operation and maintenance172171492477
Depreciation and amortizationDepreciation and amortization165156494454Depreciation and amortization169165501494
Taxes other than income taxesTaxes other than income taxes26277882Taxes other than income taxes28268278
Total operating expensesTotal operating expenses7356482,0791,971Total operating expenses8267352,3782,079
Operating incomeOperating income289272663628Operating income309289769663
Other (income) and deductions:Other (income) and deductions:Other (income) and deductions:
Interest expenseInterest expense6868206207Interest expense8368235206
Equity income from unconsolidated investments, netEquity income from unconsolidated investments, net(13)(15)(47)(46)Equity income from unconsolidated investments, net(5)(13)(37)(47)
Allowance for funds used during constructionAllowance for funds used during construction(7)(13)(16)(51)Allowance for funds used during construction(10)(7)(34)(16)
OtherOther3377Other37
Total other (income) and deductionsTotal other (income) and deductions5143150117Total other (income) and deductions6851164150
Income before income taxesIncome before income taxes238229513511Income before income taxes241238605513
Income tax benefit(21)(20)(66)(47)
Income tax expense (benefit)Income tax expense (benefit)14(21)26(66)
Net incomeNet income259249579558Net income227259579579
Preferred dividend requirements of Interstate Power and Light CompanyPreferred dividend requirements of Interstate Power and Light Company3388Preferred dividend requirements of Interstate Power and Light Company38
Net income attributable to Alliant Energy common shareownersNet income attributable to Alliant Energy common shareowners$256$246$571$550Net income attributable to Alliant Energy common shareowners$227$256$579$571
Weighted average number of common shares outstanding:Weighted average number of common shares outstanding:Weighted average number of common shares outstanding:
BasicBasic250.3249.7250.2247.9Basic251.0250.3250.8250.2
DilutedDiluted250.8250.0250.6248.1Diluted251.3250.8251.1250.6
Earnings per weighted average common share attributable to Alliant Energy common shareowners:
Basic$1.02$0.99$2.28$2.22
Diluted$1.02$0.98$2.28$2.22
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted)
Earnings per weighted average common share attributable to Alliant Energy common shareowners (basic and diluted)
$0.90$1.02$2.31$2.28

Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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ALLIANT ENERGY CORPORATION
CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)
September 30,
2021
December 31,
2020
September 30,
2022
December 31,
2021
(in millions, except per
share and share amounts)
(in millions, except per
share and share amounts)
ASSETSASSETSASSETS
Current assets:Current assets:Current assets:
Cash and cash equivalentsCash and cash equivalents$20$54Cash and cash equivalents$344$39
Accounts receivable, less allowance for expected credit lossesAccounts receivable, less allowance for expected credit losses392412Accounts receivable, less allowance for expected credit losses509440
Production fuel, at weighted average costProduction fuel, at weighted average cost4266Production fuel, at weighted average cost4951
Gas stored underground, at weighted average costGas stored underground, at weighted average cost5846Gas stored underground, at weighted average cost12482
Materials and supplies, at weighted average costMaterials and supplies, at weighted average cost118105Materials and supplies, at weighted average cost126113
Regulatory assetsRegulatory assets11181Regulatory assets177104
OtherOther274123Other364240
Total current assetsTotal current assets1,015887Total current assets1,6931,069
Property, plant and equipment, netProperty, plant and equipment, net14,73814,336Property, plant and equipment, net15,85814,987
Investments:Investments:Investments:
ATC HoldingsATC Holdings338331ATC Holdings351338
OtherOther176154Other200179
Total investmentsTotal investments514485Total investments551517
Other assets:Other assets:Other assets:
Regulatory assetsRegulatory assets1,9071,929Regulatory assets1,8641,836
Deferred charges and otherDeferred charges and other15573Deferred charges and other239144
Total other assetsTotal other assets2,0622,002Total other assets2,1031,980
Total assetsTotal assets$18,329$17,710Total assets$20,205$18,553
LIABILITIES AND EQUITYLIABILITIES AND EQUITYLIABILITIES AND EQUITY
Current liabilities:Current liabilities:Current liabilities:
Current maturities of long-term debtCurrent maturities of long-term debt$383$8Current maturities of long-term debt$658$633
Commercial paperCommercial paper316389Commercial paper383515
Accounts payableAccounts payable361377Accounts payable786436
Accrued taxesAccrued taxes8658
Regulatory liabilitiesRegulatory liabilities231249Regulatory liabilities229186
OtherOther266274Other280226
Total current liabilitiesTotal current liabilities1,5571,297Total current liabilities2,4222,054
Long-term debt, net (excluding current portion)Long-term debt, net (excluding current portion)6,6926,769Long-term debt, net (excluding current portion)7,5706,735
Other liabilities:Other liabilities:Other liabilities:
Deferred tax liabilitiesDeferred tax liabilities1,9061,814Deferred tax liabilities1,9191,927
Regulatory liabilitiesRegulatory liabilities1,1301,057Regulatory liabilities1,1581,085
Pension and other benefit obligationsPension and other benefit obligations452511Pension and other benefit obligations349374
OtherOther407374Other522388
Total other liabilitiesTotal other liabilities3,8953,756Total other liabilities3,9483,774
Commitments and contingencies (Note 14)
00
Commitments and contingencies (Note 13)
Commitments and contingencies (Note 13)
Equity:Equity:Equity:
Alliant Energy Corporation common equity:Alliant Energy Corporation common equity:Alliant Energy Corporation common equity:
Common stock - $0.01 par value - 480,000,000 shares authorized; 250,360,787 and 249,868,415 shares32
Common stock - $0.01 par value - 480,000,000 shares authorized; 251,021,830 and 250,474,529 shares outstandingCommon stock - $0.01 par value - 480,000,000 shares authorized; 251,021,830 and 250,474,529 shares outstanding33
Additional paid-in capitalAdditional paid-in capital2,7332,704Additional paid-in capital2,7672,749
Retained earningsRetained earnings3,2612,994Retained earnings3,5083,250
Accumulated other comprehensive loss(1)(1)
Shares in deferred compensation trust - 377,875 and 380,542 shares at a weighted average cost of $30.14 and $28.73 per share(11)(11)
Shares in deferred compensation trust - 395,224 and 383,532 shares at a weighted average cost of $32.23 and $30.59 per shareShares in deferred compensation trust - 395,224 and 383,532 shares at a weighted average cost of $32.23 and $30.59 per share(13)(12)
Total Alliant Energy Corporation common equityTotal Alliant Energy Corporation common equity5,9855,688Total Alliant Energy Corporation common equity6,2655,990
Cumulative preferred stock of Interstate Power and Light Company200200
Total equity6,1855,888
Total liabilities and equityTotal liabilities and equity$18,329$17,710Total liabilities and equity$20,205$18,553

Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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ALLIANT ENERGY CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
For the Nine MonthsFor the Nine Months
Ended September 30,Ended September 30,
2021202020222021
(in millions)(in millions)
Cash flows from operating activities:Cash flows from operating activities:Cash flows from operating activities:
Net incomeNet income$579$558Net income$579$579
Adjustments to reconcile net income to net cash flows from operating activities:Adjustments to reconcile net income to net cash flows from operating activities:Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortizationDepreciation and amortization494454Depreciation and amortization501494
Deferred tax benefit and tax credits(69)(48)
Deferred tax expense (benefit) and tax creditsDeferred tax expense (benefit) and tax credits8(69)
OtherOther7(17)Other(8)7
Other changes in assets and liabilities:Other changes in assets and liabilities:Other changes in assets and liabilities:
Accounts receivableAccounts receivable(397)(316)Accounts receivable(425)(397)
Derivative assetsDerivative assets(202)(22)Derivative assets(184)(202)
Regulatory assetsRegulatory assets(102)(21)
Accounts payableAccounts payable90
Derivative liabilitiesDerivative liabilities89(21)
Regulatory liabilitiesRegulatory liabilities25(72)Regulatory liabilities8925
Deferred income taxesDeferred income taxes160143Deferred income taxes(15)160
Pension and other benefit obligationsPension and other benefit obligations(59)(61)Pension and other benefit obligations(25)(59)
DAEC PPA amendment buyout payment(110)
OtherOther(61)(73)Other(112)(19)
Net cash flows from operating activitiesNet cash flows from operating activities477436Net cash flows from operating activities485477
Cash flows used for investing activities:Cash flows used for investing activities:Cash flows used for investing activities:
Construction and acquisition expenditures:Construction and acquisition expenditures:Construction and acquisition expenditures:
Utility businessUtility business(772)(935)Utility business(873)(772)
OtherOther(60)(39)Other(69)(60)
Cash receipts on sold receivablesCash receipts on sold receivables423318Cash receipts on sold receivables358423
OtherOther(43)(23)Other(15)(43)
Net cash flows used for investing activitiesNet cash flows used for investing activities(452)(679)Net cash flows used for investing activities(599)(452)
Cash flows from (used for) financing activities:Cash flows from (used for) financing activities:Cash flows from (used for) financing activities:
Common stock dividendsCommon stock dividends(304)(281)Common stock dividends(322)(304)
Proceeds from issuance of common stock, net22241
Proceeds from issuance of long-term debtProceeds from issuance of long-term debt3001,050Proceeds from issuance of long-term debt1,238300
Payments to retire long-term debtPayments to retire long-term debt(4)(654)Payments to retire long-term debt(379)(4)
Net change in commercial paperNet change in commercial paper(73)85Net change in commercial paper(132)(73)
Contributions from noncontrolling interestContributions from noncontrolling interest29
Distributions to noncontrolling interestDistributions to noncontrolling interest(29)
OtherOther2(22)Other1624
Net cash flows from (used for) financing activitiesNet cash flows from (used for) financing activities(57)419Net cash flows from (used for) financing activities421(57)
Net increase (decrease) in cash, cash equivalents and restricted cashNet increase (decrease) in cash, cash equivalents and restricted cash(32)176Net increase (decrease) in cash, cash equivalents and restricted cash307(32)
Cash, cash equivalents and restricted cash at beginning of periodCash, cash equivalents and restricted cash at beginning of period5618Cash, cash equivalents and restricted cash at beginning of period4056
Cash, cash equivalents and restricted cash at end of periodCash, cash equivalents and restricted cash at end of period$24$194Cash, cash equivalents and restricted cash at end of period$347$24
Supplemental cash flows information:Supplemental cash flows information:Supplemental cash flows information:
Cash (paid) refunded during the period for:
Cash paid during the period for:Cash paid during the period for:
InterestInterest($197)($197)Interest($220)($197)
Income taxes, netIncome taxes, net($1)$6Income taxes, net($7)($1)
Significant non-cash investing and financing activities:Significant non-cash investing and financing activities:Significant non-cash investing and financing activities:
Accrued capital expendituresAccrued capital expenditures$91$202Accrued capital expenditures$403$91
Beneficial interest obtained in exchange for securitized accounts receivableBeneficial interest obtained in exchange for securitized accounts receivable$164$201Beneficial interest obtained in exchange for securitized accounts receivable$248$164

Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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INTERSTATE POWER AND LIGHT COMPANY
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
For the Three MonthsFor the Nine MonthsFor the Three MonthsFor the Nine Months
Ended September 30,Ended September 30,Ended September 30,Ended September 30,
20212020202120202022202120222021
(in millions)(in millions)
Revenues:Revenues:Revenues:
Electric utilityElectric utility$555$519$1,343$1,332Electric utility$596$555$1,438$1,343
Gas utilityGas utility3124165141Gas utility3331224165
Steam and otherSteam and other13103531Steam and other11133435
Total revenuesTotal revenues5995531,5431,504Total revenues6405991,6961,543
Operating expenses:Operating expenses:Operating expenses:
Electric production fuel and purchased powerElectric production fuel and purchased power101102215304Electric production fuel and purchased power140101290215
Electric transmission serviceElectric transmission service10393274212Electric transmission service115103303274
Cost of gas soldCost of gas sold1268463Cost of gas sold141212684
Other operation and maintenanceOther operation and maintenance9585253269Other operation and maintenance9095260253
Depreciation and amortizationDepreciation and amortization9489281264Depreciation and amortization9594285281
Taxes other than income taxesTaxes other than income taxes14164245Taxes other than income taxes15144342
Total operating expensesTotal operating expenses4193911,1491,157Total operating expenses4694191,3071,149
Operating incomeOperating income180162394347Operating income171180389394
Other (income) and deductions:Other (income) and deductions:Other (income) and deductions:
Interest expenseInterest expense3435103104Interest expense3734111103
Allowance for funds used during constructionAllowance for funds used during construction(2)(6)(7)(21)Allowance for funds used during construction(3)(2)(8)(7)
OtherOther123Other(1)(2)2
Total other (income) and deductionsTotal other (income) and deductions32309886Total other (income) and deductions333210198
Income before income taxesIncome before income taxes148132296261Income before income taxes138148288296
Income tax benefitIncome tax benefit(12)(19)(34)(37)Income tax benefit(16)(12)(39)(34)
Net incomeNet income160151330298Net income154160327330
Preferred dividend requirementsPreferred dividend requirements3388Preferred dividend requirements38
Net income available for common stockNet income available for common stock$157$148$322$290Net income available for common stock$154$157$327$322
Earnings per share data is not disclosed given Alliant Energy Corporation is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented.
Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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INTERSTATE POWER AND LIGHT COMPANY
CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)
September 30,
2021
December 31,
2020
September 30,
2022
December 31,
2021
(in millions, except per
share and share amounts)
(in millions, except per
share and share amounts)
ASSETSASSETSASSETS
Current assets:Current assets:Current assets:
Cash and cash equivalentsCash and cash equivalents$13$50Cash and cash equivalents$45$34
Accounts receivable, less allowance for expected credit lossesAccounts receivable, less allowance for expected credit losses205210Accounts receivable, less allowance for expected credit losses286241
Income tax refunds receivableIncome tax refunds receivable18
Production fuel, at weighted average costProduction fuel, at weighted average cost3248Production fuel, at weighted average cost3129
Gas stored underground, at weighted average costGas stored underground, at weighted average cost3320Gas stored underground, at weighted average cost6640
Materials and supplies, at weighted average costMaterials and supplies, at weighted average cost7163Materials and supplies, at weighted average cost7770
Regulatory assetsRegulatory assets8652Regulatory assets10873
OtherOther10853Other13469
Total current assetsTotal current assets548496Total current assets748564
Property, plant and equipment, netProperty, plant and equipment, net7,9317,889Property, plant and equipment, net8,0137,983
Other assets:Other assets:Other assets:
Regulatory assetsRegulatory assets1,4211,431Regulatory assets1,3151,370
Deferred charges and otherDeferred charges and other7833Deferred charges and other13279
Total other assetsTotal other assets1,4991,464Total other assets1,4471,449
Total assetsTotal assets$9,978$9,849Total assets$10,208$9,996
LIABILITIES AND EQUITYLIABILITIES AND EQUITYLIABILITIES AND EQUITY
Current liabilities:Current liabilities:Current liabilities:
Accounts payableAccounts payable$140$162Accounts payable$232$173
Accounts payable to associated companiesAccounts payable to associated companies3739
Regulatory liabilitiesRegulatory liabilities104103Regulatory liabilities10584
Accrued taxesAccrued taxes6956
Accrued interestAccrued interest3536
OtherOther171182Other11267
Total current liabilitiesTotal current liabilities415447Total current liabilities590455
Long-term debt, netLong-term debt, net3,3473,345Long-term debt, net3,6453,643
Other liabilities:Other liabilities:Other liabilities:
Deferred tax liabilitiesDeferred tax liabilities1,0791,035Deferred tax liabilities1,0291,083
Regulatory liabilitiesRegulatory liabilities616573Regulatory liabilities656607
Pension and other benefit obligationsPension and other benefit obligations161186Pension and other benefit obligations118127
OtherOther325299Other314312
Total other liabilitiesTotal other liabilities2,1812,093Total other liabilities2,1172,129
Commitments and contingencies (Note 14)
00
Commitments and contingencies (Note 13)
Commitments and contingencies (Note 13)
Equity:Equity:Equity:
Interstate Power and Light Company common equity:Interstate Power and Light Company common equity:Interstate Power and Light Company common equity:
Common stock - $2.50 par value - 24,000,000 shares authorized; 13,370,788 shares outstandingCommon stock - $2.50 par value - 24,000,000 shares authorized; 13,370,788 shares outstanding3333Common stock - $2.50 par value - 24,000,000 shares authorized; 13,370,788 shares outstanding3333
Additional paid-in capitalAdditional paid-in capital2,8022,752Additional paid-in capital2,8072,807
Retained earningsRetained earnings1,000979Retained earnings1,016929
Total Interstate Power and Light Company common equityTotal Interstate Power and Light Company common equity3,8353,764Total Interstate Power and Light Company common equity3,8563,769
Cumulative preferred stock200200
Total equity4,0353,964
Total liabilities and equityTotal liabilities and equity$9,978$9,849Total liabilities and equity$10,208$9,996

Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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INTERSTATE POWER AND LIGHT COMPANY
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
For the Nine MonthsFor the Nine Months
Ended September 30,Ended September 30,
2021202020222021
(in millions)(in millions)
Cash flows from operating activities:Cash flows from operating activities:Cash flows from operating activities:
Net incomeNet income$330$298Net income$327$330
Adjustments to reconcile net income to net cash flows from operating activities:Adjustments to reconcile net income to net cash flows from operating activities:Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortizationDepreciation and amortization281264Depreciation and amortization285281
Deferred tax benefit and tax creditsDeferred tax benefit and tax credits(13)(42)Deferred tax benefit and tax credits(24)(13)
OtherOther(1)(9)Other(8)(1)
Other changes in assets and liabilities:Other changes in assets and liabilities:Other changes in assets and liabilities:
Accounts receivableAccounts receivable(412)(337)Accounts receivable(397)(412)
Derivative assetsDerivative assets(86)(12)Derivative assets(118)(86)
Regulatory assetsRegulatory assets(33)(32)Regulatory assets18(33)
Accounts payableAccounts payable715
Derivative liabilitiesDerivative liabilities62(9)
Regulatory liabilitiesRegulatory liabilities30(11)Regulatory liabilities6130
Deferred income taxesDeferred income taxes5662Deferred income taxes(30)56
Pension and other benefit obligationsPension and other benefit obligations(25)(19)Pension and other benefit obligations(9)(25)
DAEC PPA amendment buyout payment(110)
OtherOther(32)(33)Other(72)(28)
Net cash flows from operating activitiesNet cash flows from operating activities9519Net cash flows from operating activities16695
Cash flows from (used for) investing activities:
Cash flows from investing activities:Cash flows from investing activities:
Construction and acquisition expendituresConstruction and acquisition expenditures(285)(465)Construction and acquisition expenditures(269)(285)
Cash receipts on sold receivablesCash receipts on sold receivables423318Cash receipts on sold receivables358423
OtherOther(16)(55)Other(5)(16)
Net cash flows from (used for) investing activities122(202)
Cash flows from (used for) financing activities:
Net cash flows from investing activitiesNet cash flows from investing activities84122
Cash flows used for financing activities:Cash flows used for financing activities:
Common stock dividendsCommon stock dividends(301)(177)Common stock dividends(240)(301)
Capital contributions from parentCapital contributions from parent50345Capital contributions from parent50
Proceeds from issuance of long-term debt400
Payments to retire long-term debt(200)
OtherOther(3)(9)Other1(3)
Net cash flows from (used for) financing activities(254)359
Net cash flows used for financing activitiesNet cash flows used for financing activities(239)(254)
Net increase (decrease) in cash, cash equivalents and restricted cashNet increase (decrease) in cash, cash equivalents and restricted cash(37)176Net increase (decrease) in cash, cash equivalents and restricted cash11(37)
Cash, cash equivalents and restricted cash at beginning of periodCash, cash equivalents and restricted cash at beginning of period509Cash, cash equivalents and restricted cash at beginning of period3450
Cash, cash equivalents and restricted cash at end of periodCash, cash equivalents and restricted cash at end of period$13$185Cash, cash equivalents and restricted cash at end of period$45$13
Supplemental cash flows information:Supplemental cash flows information:Supplemental cash flows information:
Cash (paid) refunded during the period for:Cash (paid) refunded during the period for:Cash (paid) refunded during the period for:
InterestInterest($106)($109)Interest($111)($106)
Income taxes, netIncome taxes, net$28($12)Income taxes, net$33$28
Significant non-cash investing and financing activities:Significant non-cash investing and financing activities:Significant non-cash investing and financing activities:
Accrued capital expendituresAccrued capital expenditures$30$150Accrued capital expenditures$43$30
Beneficial interest obtained in exchange for securitized accounts receivableBeneficial interest obtained in exchange for securitized accounts receivable$164$201Beneficial interest obtained in exchange for securitized accounts receivable$248$164

Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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WISCONSIN POWER AND LIGHT COMPANY
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
For the Three MonthsFor the Nine MonthsFor the Three MonthsFor the Nine Months
Ended September 30,Ended September 30,Ended September 30,Ended September 30,
20212020202120202022202120222021
(in millions)(in millions)
Revenues:Revenues:Revenues:
Electric utilityElectric utility$384$333$1,014$925Electric utility$443$384$1,186$1,014
Gas utilityGas utility1918124112Gas utility2919194124
OtherOther11Other11
Total revenuesTotal revenues4033511,1391,038Total revenues4724031,3811,139
Operating expenses:Operating expenses:Operating expenses:
Electric production fuel and purchased powerElectric production fuel and purchased power10578263223Electric production fuel and purchased power134105343263
Electric transmission serviceElectric transmission service4439128114Electric transmission service4244125128
Cost of gas soldCost of gas sold646553Cost of gas sold13611765
Other operation and maintenanceOther operation and maintenance6665194172Other operation and maintenance7066193194
Depreciation and amortizationDepreciation and amortization7065209186Depreciation and amortization7170211209
Taxes other than income taxesTaxes other than income taxes12113535Taxes other than income taxes11123535
Total operating expensesTotal operating expenses303262894783Total operating expenses3413031,024894
Operating incomeOperating income10089245255Operating income131100357245
Other (income) and deductions:Other (income) and deductions:Other (income) and deductions:
Interest expenseInterest expense25267778Interest expense31258677
Allowance for funds used during constructionAllowance for funds used during construction(5)(6)(9)(29)Allowance for funds used during construction(7)(5)(26)(9)
OtherOther2133Other23
Total other (income) and deductionsTotal other (income) and deductions22217152Total other (income) and deductions24226071
Income before income taxesIncome before income taxes7868174203Income before income taxes10778297174
Income tax benefit(15)(5)(41)(17)
Income tax expense (benefit)Income tax expense (benefit)16(15)50(41)
Net incomeNet income$93$73$215$220Net income$91$93$247$215
Earnings per share data is not disclosed given Alliant Energy Corporation is the sole shareowner of all shares of WPL’s common stock outstanding during the periods presented.
Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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WISCONSIN POWER AND LIGHT COMPANY
CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)
September 30,
2021
December 31,
2020
(in millions, except per
share and share amounts)
ASSETS
Current assets:
Cash and cash equivalents$4$3
Accounts receivable, less allowance for expected credit losses175192
Production fuel, at weighted average cost1018
Gas stored underground, at weighted average cost2526
Materials and supplies, at weighted average cost4540
Regulatory assets2529
Prepaid gross receipts tax2942
Other9912
Total current assets412362
Property, plant and equipment, net6,3676,022
Other assets:
Regulatory assets486498
Deferred charges and other7630
Total other assets562528
Total assets$7,341$6,912
LIABILITIES AND EQUITY
Current liabilities:
Commercial paper$3$257
Accounts payable160154
Regulatory liabilities127146
Other116117
Total current liabilities406674
Long-term debt, net2,4292,130
Other liabilities:
Deferred tax liabilities747702
Regulatory liabilities514484
Finance lease obligations - Sheboygan Falls Energy Facility3442
Pension and other benefit obligations193222
Other206180
Total other liabilities1,6941,630
Commitments and contingencies (Note 14)
00
Equity:
Wisconsin Power and Light Company common equity:
Common stock - $5 par value - 18,000,000 shares authorized; 13,236,601 shares outstanding6666
Additional paid-in capital1,7041,459
Retained earnings1,042953
Total Wisconsin Power and Light Company common equity2,8122,478
Total liabilities and equity$7,341$6,912
September 30,
2022
December 31,
2021
(in millions, except per
share and share amounts)
ASSETS
Current assets:
Cash and cash equivalents$299$2
Accounts receivable, less allowance for expected credit losses211188
Production fuel, at weighted average cost1823
Gas stored underground, at weighted average cost5842
Materials and supplies, at weighted average cost4741
Regulatory assets6931
Prepaid gross receipts tax3140
Other13086
Total current assets863453
Property, plant and equipment, net7,3716,538
Other assets:
Regulatory assets549466
Deferred charges and other11561
Total other assets664527
Total assets$8,898$7,518
LIABILITIES AND EQUITY
Current liabilities:
Current maturities of long-term debt$250$250
Commercial paper236
Accounts payable470190
Accounts payable to associated companies5139
Regulatory liabilities124102
Other9373
Total current liabilities988890
Long-term debt, net (excluding current portion)2,7692,179
Other liabilities:
Deferred tax liabilities783753
Regulatory liabilities502478
Pension and other benefit obligations148159
Other352236
Total other liabilities1,7851,626
Commitments and contingencies (Note 13)
Equity:
Wisconsin Power and Light Company common equity:
Common stock - $5 par value - 18,000,000 shares authorized; 13,236,601 shares outstanding6666
Additional paid-in capital2,1231,704
Retained earnings1,1671,053
Total Wisconsin Power and Light Company common equity3,3562,823
Total liabilities and equity$8,898$7,518

Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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WISCONSIN POWER AND LIGHT COMPANY
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
For the Nine MonthsFor the Nine Months
Ended September 30,Ended September 30,
2021202020222021
(in millions)(in millions)
Cash flows from operating activities:Cash flows from operating activities:Cash flows from operating activities:
Net incomeNet income$215$220Net income$247$215
Adjustments to reconcile net income to net cash flows from operating activities:Adjustments to reconcile net income to net cash flows from operating activities:Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortizationDepreciation and amortization209186Depreciation and amortization211209
Deferred tax benefit and tax credits(63)(9)
Deferred tax expense (benefit) and tax creditsDeferred tax expense (benefit) and tax credits11(63)
OtherOther12(8)Other(7)12
Other changes in assets and liabilities:Other changes in assets and liabilities:Other changes in assets and liabilities:
Derivative assetsDerivative assets(116)(10)Derivative assets(66)(116)
Regulatory assetsRegulatory assets(120)11
Regulatory liabilities(5)(61)
Deferred income taxesDeferred income taxes10879Deferred income taxes20108
OtherOther(11)5Other(17)(27)
Net cash flows from operating activitiesNet cash flows from operating activities349402Net cash flows from operating activities279349
Cash flows used for investing activities:Cash flows used for investing activities:Cash flows used for investing activities:
Construction and acquisition expendituresConstruction and acquisition expenditures(487)(470)Construction and acquisition expenditures(604)(487)
OtherOther(23)5Other(8)(23)
Net cash flows used for investing activitiesNet cash flows used for investing activities(510)(465)Net cash flows used for investing activities(612)(510)
Cash flows from financing activities:Cash flows from financing activities:Cash flows from financing activities:
Common stock dividendsCommon stock dividends(126)(127)Common stock dividends(133)(126)
Capital contributions from parentCapital contributions from parent24525Capital contributions from parent420245
Proceeds from issuance of long-term debtProceeds from issuance of long-term debt300350Proceeds from issuance of long-term debt588300
Payments to retire long-term debt(150)
Net change in commercial paperNet change in commercial paper(254)(29)Net change in commercial paper(236)(254)
Contributions from noncontrolling interestContributions from noncontrolling interest29
Distributions to noncontrolling interestDistributions to noncontrolling interest(29)
OtherOther(3)(8)Other(9)(3)
Net cash flows from financing activitiesNet cash flows from financing activities16261Net cash flows from financing activities630162
Net increase (decrease) in cash, cash equivalents and restricted cash1(2)
Net increase in cash, cash equivalents and restricted cashNet increase in cash, cash equivalents and restricted cash2971
Cash, cash equivalents and restricted cash at beginning of periodCash, cash equivalents and restricted cash at beginning of period34Cash, cash equivalents and restricted cash at beginning of period23
Cash, cash equivalents and restricted cash at end of periodCash, cash equivalents and restricted cash at end of period$4$2Cash, cash equivalents and restricted cash at end of period$299$4
Supplemental cash flows information:Supplemental cash flows information:Supplemental cash flows information:
Cash (paid) refunded during the period for:
Cash paid during the period for:Cash paid during the period for:
InterestInterest($72)($71)Interest($78)($72)
Income taxes, netIncome taxes, net($24)$5Income taxes, net($51)($24)
Significant non-cash investing and financing activities:Significant non-cash investing and financing activities:Significant non-cash investing and financing activities:
Accrued capital expendituresAccrued capital expenditures$59$50Accrued capital expenditures$355$59

Refer to accompanying Combined Notes to Condensed Consolidated Financial Statements.
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Table of Contents
ALLIANT ENERGY CORPORATION
INTERSTATE POWER AND LIGHT COMPANY
WISCONSIN POWER AND LIGHT COMPANY

COMBINED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
NOTE 1(a) General - The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the SEC. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the 20202021 Form 10-K.

In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 20212022 are not necessarily indicative of results that may be expected for the year ending December 31, 2021.2022.

A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred. Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes.

NOTE 1(b) Asset Impairments -
Property, PlantCash and Equipment of Regulated OperationsCash Equivalents - At September 30, 2022, Alliant Energy’s, IPL’s and WPL’s cash and cash equivalents included $334 million, $39 million and $295 million of money market fund investments, respectively, with weighted average interest rates of 3%.

NOTE 1(c) Variable Interest Entities (VIEs) - In 2022, WPL 2022 Solar Holdco, LLC was formed as a joint venture to own and operate project companies responsible for the construction, ownership and operation of various solar generation assets. Members of the joint venture were a WPL subsidiary (the managing member) and a tax equity partner. In the second quarter of 2021,2022, the WPL received approval from MISOsubsidiary and the tax equity partner contributed $62 million and $29 million, respectively, to retire Columbia Units 1WPL 2022 Solar Holdco, LLC in exchange for membership interests, and 2, which had a net book value$88 million of approximately $470 millionthe contributed funds were paid to WPL in aggregate asexchange for equity interests in the project companies. In the second quarter of September 30, 2021, and currently anticipates retiring Columbia Unit 1 by the end of 2023 and Columbia Unit 2 by the end of 2024.2022, Alliant Energy and WPL concludedconsolidated this joint venture as it was a VIE in which WPL held a variable interest, and WPL controlled decisions that Columbia Units 1were significant to the joint venture’s ongoing operations and 2 meteconomic results (i.e., WPL was the criteriaprimary beneficiary).

In August 2022, the Inflation Reduction Act of 2022 was enacted. Following its enactment, WPL evaluated the provisions of the new legislation and determined that retaining full ownership of the solar projects is expected to result in lower costs for its customers. As a result, in the third quarter of 2022, WPL and the tax equity partner terminated the tax equity partnership, and WPL returned the $29 million of initial funding to the tax equity partner. Alliant Energy and WPL no longer expect their solar generation project construction costs to be considered probablefinanced with capital from tax equity partners, which would result in higher rate base amounts compared to those previously approved by the PSCW for WPL’s planned approximately 1,100 MW of abandonment as of September 30, 2021. WPL is currently allowed a full recovery of and a full return on these EGUs from both its retail and wholesale customers, and as a result,solar generation. Alliant Energy and WPL concluded that no disallowance of anticipated higher rate base amounts was required as of September 30, 2021.2022 given full ownership of WPL's planned solar generation is expected to result in lower costs for WPL's customers.

Refer to Note 6 for discussion of a noncontrolling interest that was initially associated with the joint venture prior to the termination of the tax equity partnership.

12

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NOTE 2. REGULATORY MATTERS
Regulatory Assets and Regulatory Liabilities -
Regulatory assets were comprised of the following items (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2022
December 31,
2021
September 30,
2022
December 31,
2021
September 30,
2022
December 31,
2021
Tax-relatedTax-related$931$890$881$843$50$47Tax-related$913$934$842$884$71$50
Pension and OPEB costsPension and OPEB costs549580276291273289Pension and OPEB costs436462216228220234
Asset retirement obligationsAsset retirement obligations12411985813938Asset retirement obligations145128104894139
Commodity cost recoveryCommodity cost recovery129422212740
DerivativesDerivatives1028674354
Assets retired earlyAssets retired early9811369772936Assets retired early759256661926
IPL’s DAEC PPA amendmentIPL’s DAEC PPA amendment9611096110IPL’s DAEC PPA amendment72907290
WPL’s Western Wisconsin gas distribution expansion investmentsWPL’s Western Wisconsin gas distribution expansion investments53555355WPL’s Western Wisconsin gas distribution expansion investments49524952
Commodity cost recovery324171153
Derivatives42641313
OtherOther13111379675246Other12013264805652
$2,018$2,010$1,507$1,483$511$527$2,041$1,940$1,423$1,443$618$497

Tax-related - Refer to Note 9 for discussion of Iowa Tax Reform, which resulted in a decrease in Alliant Energy’s and IPL’s tax-related regulatory assets in the third quarter of 2022.

Commodity cost recovery -In February 2021, portions of the central and southern U.S., including Alliant Energy’s service territories, experienced a prolonged period of very cold temperatures and a series of winter storms. These events created significant volatility and increases in commodity prices caused by higher demand for electricity and natural gas and disruptions in commodity supply, resulting in IPL under-recovering its natural gas costs. In March 2021, IPL received approval from the IUB to spread recovery of these higher natural gas costs from its retail customers through December 2021. As of September 30, 2021, IPL’s cumulative under-collection of natural gas costs was $15 million. The extreme temperatures in February 2021 did not impact WPL’s natural gas costs and IPL’s and WPL’s fuel-related costs to the extent of IPL’s natural gas costs.

The cost recovery mechanism for WPL’s retail electric customers is based on forecasts of certain fuel-related costs expected to be incurred during forward-looking test periods and fuel monitoring ranges determined by the PSCW during each retail electric rate proceeding or in a separate fuel cost plan approval proceeding. In 2021,During the nine months ended September 30, 2022, WPL’s actual fuel-related costs fell outside these fuel monitoring ranges, resulting in a $12$83 million deferral of higher than expected fuel-related costs as of September 30, 2021.2022.

12
Derivatives - Refer to Note 11 for discussion of changes in Alliant Energy’s, IPL’s and WPL’s derivative liabilities/assets during the nine months ended September 30, 2022, which result in comparable changes to regulatory assets/liabilities on the balance sheets.

Table of Contents
Regulatory liabilities were comprised of the following items (in millions):
Alliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
Tax-related$611$732$313$331$298$401
Cost of removal obligations383367252238131129
Derivatives22128104251173
Electric transmission cost recovery536829392429
WPL’s West Riverside liquidated damages40384038
Other537322433130
$1,361$1,306$720$676$641$630

Tax-related - Alliant Energy’s, IPL’s and WPL’s tax-related regulatory liabilities are primarily related to excess deferred tax benefits resulting from the remeasurement of accumulated deferred income taxes caused by Federal Tax Reform. During the nine months ended September 30, 2021, Alliant Energy’s, IPL’s and WPL’s tax-related regulatory liabilities decreased primarily due to returning a portion of these excess deferred tax benefits back to customers.
Alliant EnergyIPLWPL
September 30,
2022
December 31,
2021
September 30,
2022
December 31,
2021
September 30,
2022
December 31,
2021
Tax-related$582$585$304$312$278$273
Cost of removal obligations398384258252140132
Derivatives3121661647714889
WPL’s West Riverside liquidated damages33363336
Electric transmission cost recovery16514271224
Other464931231526
$1,387$1,271$761$691$626$580

NOTE 3. PROPERTY, PLANT AND EQUIPMENT
In June 2022, WPL announced revised expected timing for the retirements of its remaining coal-fired EGUs in order to help manage regional capacity and changing generation requirements across the MISO region. WPL currently expects to retire the Edgewater Generating Station (414 MW) by June 1, 2025, and Columbia Units 1 and 2 by June 1, 2026 (595 MW in aggregate). In addition, IPL currently expects to retire the coal-fired Lansing Generating Station (275 MW) in the first half of 2023. Alliant Energy, IPL and WPL are working with MISO, state regulatory commissions and other regulatory agencies, as required, to determine the timing of these actions, which are subject to change depending on operational, regulatory, market and other factors.

NOTE 4. RECEIVABLES
Sales of Accounts Receivable - IPL maintains a Receivables Purchase and Sale Agreement (Receivables Agreement) whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. In April 2021, IPL amended and extended through March 2023 the purchase commitment from the third party to which it sells its receivables. Effective April 2021, the limit on cash proceeds is $110 million. As of September 30, 2021,2022, IPL had $60$109 million of available capacity under its sales of accounts receivable program. IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions):
Three MonthsNine Months
2021202020212020
Maximum outstanding aggregate cash proceeds$110$1$110$96
Average outstanding aggregate cash proceeds6515212
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Three MonthsNine Months
2022202120222021
Maximum outstanding aggregate cash proceeds$36$110$66$110
Average outstanding aggregate cash proceeds365852

The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
September 30, 2021December 31, 2020September 30, 2022December 31, 2021
Customer accounts receivableCustomer accounts receivable$145$114Customer accounts receivable$169$125
Unbilled utility revenuesUnbilled utility revenues8392Unbilled utility revenues92104
Receivables sold to third partyReceivables sold to third party228206Receivables sold to third party261229
Less: cash proceedsLess: cash proceeds501Less: cash proceeds11
Deferred proceedsDeferred proceeds178205Deferred proceeds260228
Less: allowance for expected credit lossesLess: allowance for expected credit losses1417Less: allowance for expected credit losses1214
Fair value of deferred proceedsFair value of deferred proceeds$164$188Fair value of deferred proceeds$248$214

As of September 30, 2021,2022, outstanding receivables past due under the Receivables Agreement were $19$20 million. Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions):
Three MonthsNine MonthsThree MonthsNine Months
20212020202120202022202120222021
CollectionsCollections$607$561$1,589$1,555Collections$670$607$1,731$1,589
Write-offs, net of recoveriesWrite-offs, net of recoveries4174Write-offs, net of recoveries3467

NOTE 4.5. INVESTMENTS
Unconsolidated Equity Investments - Alliant Energy’s equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and nine months ended September 30 was as follows (in millions):
Three MonthsNine MonthsThree MonthsNine Months
20212020202120202022202120222021
ATC HoldingsATC Holdings($12)($11)($34)($36)ATC Holdings($7)($12)($29)($34)
OtherOther(1)(4)(13)(10)Other2(1)(8)(13)
($13)($15)($47)($46)($5)($13)($37)($47)

Refer to Note 13(e) for discussion of a reduction in earnings recorded in the third quarter of 2022 related to a court decision, which is currently expected to reduce the base return on equity authorized for MISO transmission owners, including ATC.
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NOTE 5.6. COMMON EQUITY
Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
Shares outstanding, January 1, 20212022249,868,415250,474,529 
Shareowner Direct Plan378,823324,533 
Equity-based compensation plans113,549222,768 
Shares outstanding, September 30, 20212022250,360,787251,021,830 

Changes in Shareowners’ EquityNoncontrolling Interest - A summaryIn the second quarter of changes2022, WPL and the tax equity partner contributed to a joint venture associated with certain WPL solar generation projects. The tax equity partner's contributions were represented as a noncontrolling interest within total equity on Alliant Energy’s and WPL’s balance sheets as of June 30, 2022. In the third quarter of 2022, WPL and the tax equity partner terminated the tax equity partnership and WPL returned the tax equity partner’s initial contributions, resulting in shareowners’the reversal of the noncontrolling interest within total equity wason Alliant Energy’s and WPL’s balance sheets as follows (in millions):of September 30, 2022. Refer to Note 1(c) for additional information.
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsIncome (Loss)Trustof IPLEquity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021$3$2,722$3,106($1)($11)$200$6,019
Net income attributable to Alliant Energy common shareowners256256
Common stock dividends ($0.4025 per share)(101)(101)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other55
Ending balance, September 30, 2021$3$2,733$3,261($1)($11)$200$6,185
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020$2$2,683$2,874($1)($10)$200$5,748
Net income attributable to Alliant Energy common shareowners246246
Common stock dividends ($0.38 per share)(94)(94)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other4(1)3
Ending balance, September 30, 2020$2$2,693$3,026($1)($11)$200$5,909
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsIncome (Loss)Trustof IPLEquity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020$2$2,704$2,994($1)($11)$200$5,888
Net income attributable to Alliant Energy common shareowners571571
Common stock dividends ($1.2075 per share)(304)(304)
Shareowner Direct Plan issuances12122
Equity-based compensation plans and other88
Ending balance, September 30, 2021$3$2,733$3,261($1)($11)$200$6,185
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019$2$2,446$2,766$1($10)$200$5,405
Net income attributable to Alliant Energy common shareowners550550
Common stock dividends ($1.14 per share)(281)(281)
Equity forward settlements and Shareowner Direct Plan issuances241241
Equity-based compensation plans and other6(1)5
Adoption of new accounting standard, net of tax(9)(9)
Other comprehensive loss, net of tax(2)(2)
Ending balance, September 30, 2020$2$2,693$3,026($1)($11)$200$5,909

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IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021$33$2,802$944$200$3,979
Net income available for common stock157157
Common stock dividends(101)(101)
Ending balance, September 30, 2021$33$2,802$1,000$200$4,035
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020$33$2,523$915$200$3,671
Net income available for common stock148148
Common stock dividends(59)(59)
Capital contributions from parent170170
Ending balance, September 30, 2020$33$2,693$1,004$200$3,930
Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020$33$2,752$979$200$3,964
Net income available for common stock322322
Common stock dividends(301)(301)
Capital contributions from parent5050
Ending balance, September 30, 2021$33$2,802$1,000$200$4,035
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019$33$2,348$891$200$3,472
Net income available for common stock290290
Common stock dividends(177)(177)
Capital contributions from parent345345
Ending balance, September 30, 2020$33$2,693$1,004$200$3,930
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022$3$2,759$3,387$—($12)$29$6,166
Net income attributable to Alliant Energy common shareowners227227
Common stock dividends ($0.4275 per share)(106)(106)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other2(1)1
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022$3$2,767$3,508$—($13)$—$6,265
WPLAdditionalTotal
CommonPaid-InRetainedCommon
StockCapitalEarningsEquity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021$66$1,669$990$2,725
Net income9393
Common stock dividends(41)(41)
Capital contributions from parent3535
Ending balance, September 30, 2021$66$1,704$1,042$2,812
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020$66$1,459$927$2,452
Net income7373
Common stock dividends(43)(43)
Ending balance, September 30, 2020$66$1,459$957$2,482
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021$3$2,722$3,106($1)($11)$200$6,019
Net income attributable to Alliant Energy common shareowners256256
Common stock dividends ($0.4025 per share)(101)(101)
Shareowner Direct Plan issuances66
Equity-based compensation plans and other55
Ending balance, September 30, 2021$3$2,733$3,261($1)($11)$200$6,185
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares in
AdditionalOtherDeferred
CommonPaid-InRetainedComprehensiveCompensationNoncontrollingTotal
StockCapitalEarningsLossTrustInterestEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021$3$2,749$3,250$—($12)$—$5,990
Net income attributable to Alliant Energy common shareowners579579
Common stock dividends ($1.2825 per share)(322)(322)
Shareowner Direct Plan issuances1919
Equity-based compensation plans and other(1)1(1)(1)
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022$3$2,767$3,508$—($13)$—$6,265
Alliant EnergyTotal Alliant Energy Common Equity
AccumulatedShares inCumulative
AdditionalOtherDeferredPreferred
CommonPaid-InRetainedComprehensiveCompensationStockTotal
StockCapitalEarningsLossTrustof IPLEquity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020$2$2,704$2,994($1)($11)$200$5,888
Net income attributable to Alliant Energy common shareowners571571
Common stock dividends ($1.2075 per share)(304)(304)
Shareowner Direct Plan issuances12122
Equity-based compensation plans and other88
Ending balance, September 30, 2021$3$2,733$3,261($1)($11)$200$6,185
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WPLAdditionalTotal
CommonPaid-InRetainedCommon
StockCapitalEarningsEquity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020$66$1,459$953$2,478
Net income215215
Common stock dividends(126)(126)
Capital contributions from parent245245
Ending balance, September 30, 2021$66$1,704$1,042$2,812
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019$66$1,434$864$2,364
Net income220220
Common stock dividends(127)(127)
Capital contributions from parent2525
Ending balance, September 30, 2020$66$1,459$957$2,482
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022$33$2,807$942$—$3,782
Net income available for common stock154154
Common stock dividends(80)(80)
Ending balance, September 30, 2022$33$2,807$1,016$—$3,856
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021$33$2,802$944$200$3,979
Net income available for common stock157157
Common stock dividends(101)(101)
Ending balance, September 30, 2021$33$2,802$1,000$200$4,035
IPLTotal IPL Common Equity
AdditionalCumulative
CommonPaid-InRetainedPreferredTotal
StockCapitalEarningsStockEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021$33$2,807$929$—$3,769
Net income available for common stock327327
Common stock dividends(240)(240)
Ending balance, September 30, 2022$33$2,807$1,016$—$3,856
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020$33$2,752$979$200$3,964
Net income available for common stock322322
Common stock dividends(301)(301)
Capital contributions from parent5050
Ending balance, September 30, 2021$33$2,802$1,000$200$4,035
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Three Months Ended September 30, 2022
Beginning balance, June 30, 2022$66$1,968$1,120$29$3,183
Net income9191
Common stock dividends(44)(44)
Capital contributions from parent155155
Distributions to noncontrolling interest(29)(29)
Ending balance, September 30, 2022$66$2,123$1,167$—$3,356
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021$66$1,669$990$—$2,725
Net income9393
Common stock dividends(41)(41)
Capital contributions from parent3535
Ending balance, September 30, 2021$66$1,704$1,042$—$2,812
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NOTE 6. PREFERRED STOCK
In November 2021, IPL announced it will redeem all 8,000,000 outstanding shares of its 5.1% cumulative preferred stock in December 2021 at par value for approximately $200 million plus accrued and unpaid dividends up to the redemption date.
WPLTotal WPL Common Equity
Additional
CommonPaid-InRetainedNoncontrollingTotal
StockCapitalEarningsInterestEquity
Nine Months Ended September 30, 2022
Beginning balance, December 31, 2021$66$1,704$1,053$—$2,823
Net income247247
Common stock dividends(133)(133)
Capital contributions from parent420420
Contributions from noncontrolling interest2929
Distributions to noncontrolling interest(29)(29)
Other(1)(1)
Ending balance, September 30, 2022$66$2,123$1,167$—$3,356
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020$66$1,459$953$—$2,478
Net income215215
Common stock dividends(126)(126)
Capital contributions from parent245245
Ending balance, September 30, 2021$66$1,704$1,042$—$2,812

NOTE 7. DEBT
NOTE 7(a) Short-term Debt - Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper classified as short-term debt was as follows (dollars in millions):
September 30, 2022Alliant EnergyIPLWPL
Amount outstanding$383$—$—
Weighted average interest rates3.4%N/AN/A
Available credit facility capacity$617$250$300
Alliant EnergyIPLWPL
Three Months Ended September 30202220212022202120222021
Maximum amount outstanding (based on daily outstanding balances)$449$648$—$8$251$320
Average amount outstanding (based on daily outstanding balances)$353$560$—$—$110$221
Weighted average interest rates2.4%0.2%—%0.2%2.0%0.1%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)$577$648$—$19$252$320
Average amount outstanding (based on daily outstanding balances)$377$479$—$—$160$196
Weighted average interest rates1.2%0.2%—%0.2%0.9%0.1%

In the third quarter of 2021,October 2022, Alliant Energy, IPL and WPL reallocated credit facility capacity amounts to $500 million for Alliant Energy at the parent company level, $100$200 million for IPL and $400$300 million for WPL, within the $1 billion total commitment. Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper, and Alliant Energy’s and WPL’s borrowings under the single credit facility, which currently expires in August 2023, classified as short-term debt was as follows (dollars in millions):
September 30, 2021Alliant EnergyIPLWPL
Amount outstanding$316$—$3
Weighted average interest rates0.2%N/A0.1%
Available credit facility capacity$684$100$397
Alliant EnergyIPLWPL
Three Months Ended September 30202120202021202020212020
Maximum amount outstanding (based on daily outstanding balances)$648$422$8$—$320$139
Average amount outstanding (based on daily outstanding balances)$560$252$—$—$221$83
Weighted average interest rates0.2%0.2%0.2%N/A0.1%0.2%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)$648$463$19$8$320$212
Average amount outstanding (based on daily outstanding balances)$479$252$—$—$196$86
Weighted average interest rates0.2%1.1%0.2%0.5%0.1%1.2%

NOTE 7(b) Long-term Debt - In February 2022, AEF issued $350 million of 3.6% senior notes due 2032. The net proceeds from the issuance were used to reduce Alliant Energy’s outstanding commercial paper and for general corporate purposes. In March 2022, AEF entered into a $300 million variable rate (3% as of September 2021,30, 2022) term loan credit agreement (with Alliant Energy as guarantor), which expires in March 2024, and used the borrowings under this agreement to retire its $300 million variable rate term loan credit agreement that expired in March 2022.

In August 2022, WPL issued $300$600 million of 1.95%3.95% debentures due 2031.2032. The debentures were issued as green bonds, and an amount equal to or in excess of the net proceeds will be disbursed for the constructiondevelopment and developmentacquisition of WPL’s wind and solar EGUs.

In September 2022, Corporate Services retired its $75 million, 3.45% senior notes due 2022.

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NOTE 8. REVENUES
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Three Months Ended September 30Three Months Ended September 30202120202021202020212020Three Months Ended September 30202220212022202120222021
Electric Utility:Electric Utility:Electric Utility:
Retail - residentialRetail - residential$348$328$207$189$141$139Retail - residential$376$348$222$207$154$141
Retail - commercialRetail - commercial2322101601427268Retail - commercial2432321651607872
Retail - industrialRetail - industrial26524115814910792Retail - industrial289265172158117107
WholesaleWholesale554718173730Wholesale685519184937
Bulk power and otherBulk power and other39261222274Bulk power and other633918124527
Total Electric UtilityTotal Electric Utility939852555519384333Total Electric Utility1,039939596555443384
Gas Utility:Gas Utility:Gas Utility:
Retail - residentialRetail - residential242214121010Retail - residential282414141410
Retail - commercialRetail - commercial13108654Retail - commercial181388105
Retail - industrialRetail - industrial32311Retail - industrial43331
Transportation/otherTransportation/other1086543Transportation/other12108644
Total Gas UtilityTotal Gas Utility504231241918Total Gas Utility625033312919
Other Utility:Other Utility:Other Utility:
SteamSteam9898Steam9999
Other utilityOther utility4242Other utility2424
Total Other UtilityTotal Other Utility13101310Total Other Utility11131113
Non-Utility and Other:Non-Utility and Other:Non-Utility and Other:
Travero and otherTravero and other2216Travero and other2322
Total Non-Utility and OtherTotal Non-Utility and Other2216Total Non-Utility and Other2322
Total revenuesTotal revenues$1,024$920$599$553$403$351Total revenues$1,135$1,024$640$599$472$403
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Nine Months Ended September 30Nine Months Ended September 30202120202021202020212020Nine Months Ended September 30202220212022202120222021
Electric Utility:Electric Utility:Electric Utility:
Retail - residentialRetail - residential$868$845$488$472$380$373Retail - residential$956$868$529$488$427$380
Retail - commercialRetail - commercial579556385371194185Retail - commercial628579411385217194
Retail - industrialRetail - industrial677648386384291264Retail - industrial743677418386325291
WholesaleWholesale14212744449883Wholesale168142494411998
Bulk power and otherBulk power and other918140615120Bulk power and other1299131409851
Total Electric UtilityTotal Electric Utility2,3572,2571,3431,3321,014925Total Electric Utility2,6242,3571,4381,3431,1861,014
Gas Utility:Gas Utility:Gas Utility:
Retail - residentialRetail - residential16214690797267Retail - residential2371621279011072
Retail - commercialRetail - commercial857047383832Retail - commercial1278562476538
Retail - industrialRetail - industrial1188533Retail - industrial151110853
Transportation/otherTransportation/other312920191110Transportation/other393125201411
Total Gas UtilityTotal Gas Utility289253165141124112Total Gas Utility418289224165194124
Other Utility:Other Utility:Other Utility:
SteamSteam27272727Steam29272927
Other utilityOther utility958411Other utility695811
Total Other UtilityTotal Other Utility3632353111Total Other Utility3536343511
Non-Utility and Other:Non-Utility and Other:Non-Utility and Other:
Travero and otherTravero and other6057Travero and other7060
Total Non-Utility and OtherTotal Non-Utility and Other6057Total Non-Utility and Other7060
Total revenuesTotal revenues$2,742$2,599$1,543$1,504$1,139$1,038Total revenues$3,147$2,742$1,696$1,543$1,381$1,139

NOTE 9. INCOME TAXES
Income Tax Rates - Overall effective income tax rates, which were computed by dividing income tax expense (benefit) by income before income taxes, were as follows. The effective income tax rates were different than the federal statutory rate primarily due to state income taxes, production tax credits, amortization of excess deferred taxes and the effect of rate-making on property-related differences. The decreasesincreases in Alliant Energy’s and WPL’s overall effective income tax rates for the three and nine months ended September 30, 2021 compared to the same periods in 2020 were primarily due to increased amortization of excess deferred taxes primarily at WPL, which were used to offset increases in WPL’s 2021 increased revenue requirements.
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Alliant EnergyIPLWPL
Three MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine Months
202120202021202020212020202120202021202020212020
Overall income tax rate(9%)(9%)(13%)(9%)(8%)(14%)(11%)(14%)(19%)(7%)(24%)(8%)
and nine months ended September 30, 2022 compared to the same periods in 2021 were primarily due to decreased amortization of excess deferred taxes primarily at WPL.
Alliant EnergyIPLWPL
Three MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine Months
202220212022202120222021202220212022202120222021
Overall income tax rate6%(9%)4%(13%)(12%)(8%)(14%)(11%)15%(19%)17%(24%)

Deferred Tax Assets and Liabilities -
Carryforwards - In the third quarter of 2022, Alliant Energy, IPL and WPL fully utilized their respective federal net operating losses carryforwards. At September 30, 2021,2022, the remaining carryforwards and expiration dates were estimated as follows (in millions):
Range of Expiration DatesAlliant EnergyIPLWPLRange of Expiration DatesAlliant EnergyIPLWPL
Federal net operating losses2037$170$157$1
State net operating lossesState net operating losses2021-2041592242State net operating losses2022-2042$500$9$2
Federal tax creditsFederal tax credits2022-2041547339186Federal tax credits2022-2042655437208

Iowa Tax Reform - In March 2022, Iowa tax reform was enacted. Annually, and by each November 1, the Iowa Department of Revenue will establish corporate income tax rates for the next tax year based on net corporate income tax receipts for the prior tax year, and reduce such rates if certain state income tax revenue triggers are satisfied. These corporate income tax rate reductions are currently expected to occur over a period of several years, with a target corporate income tax rate of 5.5%, compared to the current 9.8% Iowa corporate income tax rate. In September 2022, the Iowa Department of Revenue announced an Iowa corporate income tax rate of 8.4%, effective January 1, 2023. Deferred tax assets and liabilities are measured at the enacted tax rate expected to be applied when temporary differences are to be realized or settled. Given the announcement of the new Iowa corporate income tax rate, Alliant Energy’s and IPL’s deferred tax liabilities were remeasured based upon the new rate effective January 1, 2023, which resulted in a $76 million reduction of Alliant Energy’s and IPL’s tax-related regulatory assets and a decrease in their deferred tax liabilities in the third quarter of 2022. The reduction in tax-related regulatory assets is expected to provide cost benefits to IPL’s customers in the future. Alliant Energy parent company’s deferred tax assets were remeasured based upon the new rate effective January 1, 2023, which resulted in a charge of $8 million recorded to income tax expense in Alliant Energy’s income statement and a decrease in deferred income tax assets on Alliant Energy’s balance sheet in the third quarter of 2022. Alliant Energy is currently unable to predict with certainty the timing or amount of any future rate reductions.

NOTE 10. BENEFIT PLANS
NOTE 10(a) Pension and OPEB Plans -
Net Periodic Benefit Costs - The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.
Defined Benefit Pension PlansOPEB PlansDefined Benefit Pension PlansOPEB Plans
Three MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine Months
Alliant EnergyAlliant Energy20212020202120202021202020212020Alliant Energy20222021202220212022202120222021
Service costService cost$2$3$8$8$1$1$3$3Service cost$3$2$7$8$—$1$2$3
Interest costInterest cost91026321235Interest cost9927261143
Expected return on plan assetsExpected return on plan assets(17)(17)(51)(52)(1)(1)(3)(4)Expected return on plan assets(18)(17)(52)(51)(1)(3)(3)
Amortization of prior service creditAmortization of prior service credit(1)(1)Amortization of prior service credit(1)(1)
Amortization of actuarial lossAmortization of actuarial loss1092926132Amortization of actuarial loss81024291123
Settlement losses (a)4
$3$5$11$18$2$2$6$6
$2$3$6$11$2$2$5$6
Defined Benefit Pension PlansOPEB PlansDefined Benefit Pension PlansOPEB Plans
Three MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine Months
IPLIPL20212020202120202021202020212020IPL20222021202220212022202120222021
Service costService cost$1$2$5$5$—$—$1$1Service cost$1$1$4$5$—$—$1$1
Interest costInterest cost4512151122Interest cost4412121122
Expected return on plan assetsExpected return on plan assets(8)(8)(24)(24)(1)(1)(3)(3)Expected return on plan assets(7)(8)(23)(24)(1)(1)(3)(3)
Amortization of actuarial lossAmortization of actuarial loss54131111Amortization of actuarial loss3510131
$2$3$6$7$—$—$1$1$1$2$3$6$—$—$—$1
Defined Benefit Pension PlansOPEB Plans
Three MonthsNine MonthsThree MonthsNine Months
WPL20212020202120202021202020212020
Service cost$1$1$3$3$1$—$1$1
Interest cost351114112
Expected return on plan assets(8)(8)(23)(23)(1)(1)
Amortization of actuarial loss5414121122
$1$2$5$6$2$1$4$4
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Defined Benefit Pension PlansOPEB Plans
Three MonthsNine MonthsThree MonthsNine Months
WPL20222021202220212022202120222021
Service cost$—$1$2$3$—$1$—$1
Interest cost431211121
Expected return on plan assets(7)(8)(23)(23)
Amortization of actuarial loss451214112
$1$1$3$5$1$2$3$4

(a)Settlement losses related to payments made to retired executives of Alliant Energy.

NOTE 10(b) Equity-based Compensation Plans - A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Three MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine Months
202120202021202020212020202120202021202020212020202220212022202120222021202220212022202120222021
Compensation expenseCompensation expense$4$5$9$10$2$3$5$6$2$2$4$4Compensation expense$3$4$9$9$2$2$5$5$1$2$4$4
Income tax benefitsIncome tax benefits113311211Income tax benefits11331111

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As of September 30, 2021,2022, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $7$8 million, $4$5 million and $3 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years.

For the nine months ended September 30, 2021,2022, performance shares, performance restricted stock units and restricted stock units were granted to key employees under existing plans as follows. These shares and units will be paid out in shares of common stock, and are therefore accounted for as equity awards.
Weighted AverageWeighted Average
GrantsGrant Date Fair ValueGrantsGrant Date Fair Value
Performance sharesPerformance shares73,112$46.19Performance shares74,106$54.45
Performance restricted stock unitsPerformance restricted stock units73,11248.66Performance restricted stock units84,67057.01
Restricted stock unitsRestricted stock units80,15248.65Restricted stock units77,12256.88

As of September 30, 2021, 491,4062022, 285,909 shares were included in the calculation of diluted EPS related to the nonvested equity awards.

NOTE 11. ASSET RETIREMENT OBLIGATIONS
A reconciliation of the changes in asset retirement obligations associated with long-lived assets for the nine months ended September 30, 2021 is as follows (in millions):
Alliant EnergyIPL
Balance, January 1$251$177
Revisions in estimated cash flows3732
Liabilities settled(10)(8)
Liabilities incurred1
Accretion expense64
Balance, September 30$285$205

NOTE 12.11. DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Notional Amounts - As of September 30, 2021,2022, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
FTRsNatural GasCoalDiesel FuelElectricityFTRsNatural GasCoalDiesel Fuel
MWhsYearsDthsYearsTonsYearsGallonsYearsMWhsYearsMWhsYearsDthsYearsTonsYearsGallonsYears
Alliant EnergyAlliant Energy13,265 2021-2022189,332 2021-20304,280 2021-20233,654 2021-2022Alliant Energy1,3792022-202414,454 2022-2023249,508 2022-20321,566 2022-2023756 2022
IPLIPL4,014 2021-2022103,859 2021-20301,807 2021-2023— IPL7682022-20246,165 2022-2023135,193 2022-2030669 2022-2023— 
WPLWPL9,251 2021-202285,473 2021-20302,473 2021-20233,654 2021-2022WPL6112022-20238,289 2022-2023114,315 2022-2032897 2022-2023756 2022

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheets as assets or liabilities as follows (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2021
December 31,
2020
September 30,
2022
December 31,
2021
September 30,
2022
December 31,
2021
September 30,
2022
December 31,
2021
Current derivative assetsCurrent derivative assets$158$24$72$20$86$4Current derivative assets$200$113$117$48$83$65
Non-current derivative assetsNon-current derivative assets7810439351Non-current derivative assets1606385367527
Current derivative liabilitiesCurrent derivative liabilities39336Current derivative liabilities718544174
Non-current derivative liabilitiesNon-current derivative liabilities116197Non-current derivative liabilities27112151

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During the nine months ended September 30, 2021,2022, Alliant Energy’s, IPL’s and WPL’s derivative assets increased primarily due to the annual FTR auction operated by MISO and derivative liabilities decreased primarily as a result of higher natural gas prices. Alliant Energy’s, IPL’s and WPL’s derivative liabilities increased primarily due to new natural gas contracts entered into in the second quarter of 2022. Based on IPL’s and WPL’s natural gas cost recovery mechanisms, thisthe changes in the fair value of derivative liabilities/assets resulted in corresponding decreases in derivativecomparable changes to regulatory assets and increases in derivative regulatory assets/liabilities on the balance sheets.

Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. At September 30, 20212022 and December 31, 2020,2021, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position was not materially different than amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL
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or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered.

Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, amounts would not be materially different from gross amounts of derivative assets and derivative liabilities at September 30, 2021 and December 31, 2020. related to commodity contracts would have been presented on the balance sheets as follows (in millions):
Alliant EnergyIPLWPL
GrossGrossGross
(as reported)Net(as reported)Net(as reported)Net
September 30, 2022
Derivative assets$360$308$202$165$158$143
Derivative liabilities984666293217
December 31, 2021
Derivative assets17617184839288
Derivative liabilities944351

Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement.

NOTE 13.12. FAIR VALUE MEASUREMENTS
Fair Value of Financial Instruments - The carrying amounts of current assets and current liabilities approximate fair value because of the short maturity of such financial instruments. Carrying amounts and related estimated fair values of other financial instruments were as follows (in millions):
Alliant EnergySeptember 30, 2021December 31, 2020
Fair ValueFair Value
CarryingLevelLevelLevelCarryingLevelLevelLevel
Amount123TotalAmount123Total
Assets:
Money market fund investments$9 $9 $— $— $9 $44 $44 $— $— $44 
Derivatives236  207 29 236 34 — 29 34 
Deferred proceeds164   164 164 188 — — 188 188 
Liabilities:
Derivatives4  4  4 25 — 25 — 25 
Long-term debt (incl. current maturities)7,075  8,083 1 8,084 6,777 — 8,107 8,109 
IPLSeptember 30, 2021December 31, 2020
Fair ValueFair Value
CarryingLevelLevelLevelCarryingLevelLevelLevel
Amount123TotalAmount123Total
Assets:
Money market fund investments$9 $9 $— $— $9 $44 $44 $— $— $44 
Derivatives115  96 19 115 29 — 26 29 
Deferred proceeds164   164 164 188 — — 188 188 
Liabilities:
Derivatives4  4  4 12 — 12 — 12 
Long-term debt3,347  3,849  3,849 3,345 — 4,021 — 4,021 
WPLSeptember 30, 2021December 31, 2020
Fair ValueFair Value
CarryingLevelLevelLevelCarryingLevelLevelLevel
Amount123TotalAmount123Total
Assets:
Derivatives$121 $— $111 $10 $121 $5 $— $2 $3 $5 
Liabilities:
Derivatives     13 — 13 — 13 
Long-term debt2,429  2,869  2,869 2,130 — 2,690 — 2,690 

Alliant EnergySeptember 30, 2022December 31, 2021
Fair ValueFair Value
CarryingLevelLevelLevelCarryingLevelLevelLevel
Amount123TotalAmount123Total
Assets:
Money market fund investments$334 $334 $— $— $334 $32 $32 $— $— $32 
Derivatives360  295 65 360 176 — 146 30 176 
Deferred proceeds248   248 248 214 — — 214 214 
Liabilities:
Derivatives98  78 20 98 — 
Long-term debt (incl. current maturities)8,228  7,473 1 7,474 7,368 — 8,329 8,330 
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IPLSeptember 30, 2022December 31, 2021
Fair ValueFair Value
CarryingLevelLevelLevelCarryingLevelLevelLevel
Amount123TotalAmount123Total
Assets:
Money market fund investments$39 $39 $— $— $39 $32 $32 $— $— $32 
Derivatives202  150 52 202 84 — 65 19 84 
Deferred proceeds248   248 248 214 — — 214 214 
Liabilities:
Derivatives66  47 19 66 — 
Long-term debt3,645  3,228  3,228 3,643 — 4,124 — 4,124 
WPLSeptember 30, 2022December 31, 2021
Fair ValueFair Value
CarryingLevelLevelLevelCarryingLevelLevelLevel
Amount123TotalAmount123Total
Assets:
Money market fund investments$295 $295 $— $— $295 $— $— $— $— $— 
Derivatives158  145 13 158 92 — 81 11 92 
Liabilities:
Derivatives32  31 1 32 — — 
Long-term debt (incl. current maturities)3,019  2,778  2,778 2,429 — 2,862 — 2,862 

Information for Alliant Energy’s and IPL’s fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions). Such amounts for WPL were not material.:
Alliant EnergyAlliant EnergyCommodity Contract DerivativeAlliant EnergyCommodity Contract Derivative
Assets and (Liabilities), netDeferred ProceedsAssets and (Liabilities), netDeferred Proceeds
Three Months Ended September 30Three Months Ended September 302021202020212020Three Months Ended September 302022202120222021
Beginning balance, July 1Beginning balance, July 1$39$36$154$194Beginning balance, July 1$72$39$244$154
Total net gains included in changes in net assets (realized/unrealized)5
Total net gains (losses) included in changes in net assets (realized/unrealized)Total net gains (losses) included in changes in net assets (realized/unrealized)(1)5
Transfers out of Level 3Transfers out of Level 3(8)Transfers out of Level 3(8)
Sales(1)
Settlements (a)Settlements (a)(7)(5)107Settlements (a)(26)(7)410
Ending balance, September 30Ending balance, September 30$29$30$164$201Ending balance, September 30$45$29$248$164
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30$5($1)$—$—The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30($1)$5$—$—
Alliant EnergyCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Nine Months Ended September 302021202020212020
Beginning balance, January 1$29$21$188$188
Total net gains included in changes in net assets (realized/unrealized)68
Transfers out of Level 3(8)
Purchases2114
Sales(1)
Settlements (a)(19)(12)(24)13
Ending balance, September 30$29$30$164$201
The amount of total net gains for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30$6$8$—$—
IPLCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Three Months Ended September 302021202020212020
Beginning balance, July 1$30$32$154$194
Total net gains (losses) included in changes in net assets (realized/unrealized)2(1)
Transfers out of Level 3(8)
Sales(1)
Settlements (a)(5)(4)107
Ending balance, September 30$19$26$164$201
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30$2($1)$—$—
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IPLCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Nine Months Ended September 302021202020212020
Beginning balance, January 1$26$18$188$188
Total net gains included in changes in net assets (realized/unrealized)7
Transfers out of Level 3(8)
Purchases1611
Sales(1)
Settlements (a)(15)(9)(24)13
Ending balance, September 30$19$26$164$201
The amount of total net gains for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30$—$7$—$—
Alliant EnergyCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Nine Months Ended September 302022202120222021
Beginning balance, January 1$29$29$214$188
Total net gains (losses) included in changes in net assets (realized/unrealized)(17)6
Transfers out of Level 3(8)
Purchases7921
Settlements (a)(46)(19)34(24)
Ending balance, September 30$45$29$248$164
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30($17)$6$—$—
IPLCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Three Months Ended September 302022202120222021
Beginning balance, July 1$58$30$244$154
Total net gains (losses) included in changes in net assets (realized/unrealized)(6)2
Transfers out of Level 3(8)
Settlements (a)(19)(5)410
Ending balance, September 30$33$19$248$164
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30($6)$2$—$—
IPLCommodity Contract Derivative
Assets and (Liabilities), netDeferred Proceeds
Nine Months Ended September 302022202120222021
Beginning balance, January 1$18$26$214$188
Total net losses included in changes in net assets (realized/unrealized)(13)
Transfers out of Level 3(8)
Purchases5816
Settlements (a)(30)(15)34(24)
Ending balance, September 30$33$19$248$164
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30($14)$—$—$—
WPLCommodity Contract Derivative
Assets and (Liabilities), net
Three Months Ended September 3020222021
Beginning balance, July 1$14$9
Total net gains included in changes in net assets (realized/unrealized)53
Settlements(7)(2)
Ending balance, September 30$12$10
The amount of total net gains for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at September 30$5$3
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WPLCommodity Contract Derivative
Assets and (Liabilities), net
Nine Months Ended September 3020222021
Beginning balance, January 1$11$3
Total net gains (losses) included in changes in net assets (realized/unrealized)(4)6
Purchases215
Settlements(16)(4)
Ending balance, September 30$12$10
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at September 30($3)$6

(a)Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for expected credit losses associated with the receivables sold and cash amounts received from the receivables sold.

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Commodity Contracts - The fair value of FTR and natural gas commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions):
Alliant EnergyIPLWPL
Excluding FTRsFTRsExcluding FTRsFTRsExcluding FTRsFTRs
September 30, 2021$7$22$5$14$2$8
December 31, 2020181117912
Alliant EnergyIPLWPL
Excluding FTRsFTRsExcluding FTRsFTRsExcluding FTRsFTRs
September 30, 2022($14)$59($15)$48$1$11
December 31, 2021920810110

NOTE 14.13. COMMITMENTS AND CONTINGENCIES
NOTE 14(a)13(a) Capital Purchase Commitments - Various contractual obligations contain minimum future commitments related to capital expenditures for certain construction projects, including WPL’s expansion of solar generation. At September 30, 2021,2022, Alliant Energy’s and WPL’s minimum future commitments for these projects were $95$208 million and $93$206 million, respectively.

NOTE 14(b)13(b) Other Purchase Commitments - Various commodity supply, transportation and storage contracts help meet obligations to provide electricity and natural gas to utility customers. In addition, there are various purchase commitments associated with other goods and services. At September 30, 2021,2022, related minimum future commitments were as follows (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Natural gasNatural gas$985$514$471Natural gas$1,608$742$866
CoalCoal825428Coal19795102
Other (a)Other (a)1347139Other (a)1265728
$1,201$639$538$1,931$894$996

(a)Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2021.2022.

NOTE 14(c)13(c) Guarantees and Indemnifications -
Whiting Petroleum - Whiting Petroleum is an independent oil and gas company. In 2004, Alliant Energy sold its remaining interest in Whiting Petroleum. Alliant Energy Resources, LLC, as the successor to a predecessor entity that owned Whiting Petroleum, and a wholly-owned subsidiary of AEF, continues to guarantee the partnership obligations of an affiliate of Whiting Petroleum under multiple general partnership agreements in the oil and gas industry. The guarantees do not include a maximum limit. Based on information made available to Alliant Energy by Whiting Petroleum, the Whiting Petroleum affiliate holds an approximate 6% share in the partnerships, and currently known obligations include costs associated with the future abandonment of certain facilities owned by the partnerships. The general partnerships were formed under California law, and Alliant Energy Resources, LLC may need to perform under the guarantees if the affiliate of Whiting Petroleum is unable to meet its partnership obligations.

As of September 30, 2021,2022, the currently known partnership obligations for the abandonment obligations are estimated at $68$58 million, which represents Alliant Energy’s currently estimated maximum exposure under the guarantees. Alliant Energy estimates its expected loss to be a portion of the $68$58 million of known partnership abandonment obligations of the Whiting Petroleum affiliate and the other partners. Alliant Energy is not aware of any material liabilities related to these guarantees that it is probable that it will be obligated to pay; however, as of both September 30, 20212022 and December 31, 2020,2021, a liability of $5 million is recorded in “Other liabilities” on Alliant Energy’s balance sheets for expected credit losses related to the contingent obligations that are in the scope of these guarantees.

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Whiting Petroleum completed a business combination with Oasis Petroleum Inc. in July 2022. The combined operations are now known as Chord Energy Corporation. The business combination is not expected to affect the scope of the Whiting Petroleum affiliate’s obligations to Alliant Energy or Alliant Energy’s related guarantees.

Non-utility Wind Farm in Oklahoma - In 2017, a wholly-owned subsidiary of AEF acquired a cash equity ownership interest in a non-utility wind farm located in Oklahoma. The wind farm provides electricity to a third party under a long-term PPA. Alliant Energy provided a parent guarantee of its subsidiary’s indemnification obligations under the related operating agreement and PPA. Alliant Energy’s obligations under the operating agreement were $67$59 million as of September 30, 20212022 and will reduce annually until expiring in July 2047. Alliant Energy’s obligations under the PPA are subject to a maximum limit of $17 million and expire in December 2031, subject to potential extension. Alliant Energy is not aware of any material liabilities related to this guarantee that it is probable that it will be obligated to pay and therefore has not recognized any material liabilities related to this guarantee as of September 30, 20212022 and December 31, 2020.2021.

NOTE 14(d)13(d) Environmental Matters -
Manufactured Gas Plant (MGP) Sites - IPL and WPL have current or previous ownership interests in various sites that are previously associated with the production of gas for which IPL and WPL have, or may have in the future, liability for investigation, remediation and monitoring costs. IPL and WPL are working pursuant to the requirements of various federal and state agencies to investigate, mitigate, prevent and remediate, where necessary, the environmental impacts to property, including natural resources, at and around these former MGP sites in order to protect public health and the environment. At September 30, 2021,2022, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, which are not discounted, were as follows (in millions). At September 30, 2021,2022, such amounts for WPL were not material.
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Alliant EnergyIPLAlliant EnergyIPL
Range of estimated future costsRange of estimated future costs$9 -$24$6 -$19Range of estimated future costs$9 -$25$6 -$19
Current and non-current environmental liabilitiesCurrent and non-current environmental liabilities$12$9Current and non-current environmental liabilities$12$8

IPL Consent Decree - In 2015, the U.S. District Court for the Northern District of Iowa approved a Consent Decree that IPL entered into with the EPA, the Sierra Club, the State of Iowa and Linn County in Iowa, thereby resolving potential Clean Air Act issues associated with emissions from IPL’s coal-fired generating facilities in Iowa. IPL has completed various requirements under the Consent Decree. IPL’s remaining requirements include fuel switching or retiring Burlington by December 31, 2021 and Prairie Creek Units 1 and 3 by December 31, 2025. Alliant Energy and IPL currently expect to recover material costs incurred by IPL related to compliance with the terms of the Consent Decree from IPL’s electric customers.

Other Environmental Contingencies - In addition to the environmental liabilities discussed above, various environmental rules are monitored that may have a significant impact on future operations. Several of these environmental rules are subject to legal challenges, reconsideration and/or other uncertainties. Given uncertainties regarding the outcome, timing and compliance plans for these environmental matters, the complete financial impact of each of these rules is not able to be determined; however, future capital investments and/or modifications to EGUs and electric and gas distribution systems to comply with certain of these rules could be significant. Specific current, proposed or potential environmental matters include, among others: Effluent Limitation Guidelines, Coal Combustion Residuals Rule, and various legislation and EPA regulations to monitor and regulate the emission of greenhouse gases, including the Clean Air Act.

NOTE 13(e) MISO Transmission Owner Return on Equity Complaints - A group of stakeholders, including MISO cooperative and municipal utilities, previously filed complaints with FERC requesting a reduction to the base return on equity authorized for MISO transmission owners, including ITC Midwest LLC and ATC. In 2019, FERC issued an order on the previously filed complaints and reduced the base return on equity authorized for the MISO transmission owners to 9.88% for November 12, 2013 through February 11, 2015, and subsequent to September 28, 2016. In 2020, FERC issued orders in response to various rehearing requests and increased the base return on equity authorized for the MISO transmission owners from 9.88% to 10.02% for November 12, 2013 through February 11, 2015, and subsequent to September 28, 2016. In August 2022, the U.S. Court of Appeals for the District of Columbia Circuit vacated FERC’s prior orders that established the base return on equity authorized for the MISO transmission owners and remanded the cases to FERC for further proceedings, which may result in additional changes to the base return on equity authorized for the MISO transmission owners. As a result of the August 2022 court decision, Alliant Energy recorded a $5 million reduction in “Equity income from unconsolidated investments” in its income statement for the three and nine months ended September 30, 2022 to reflect the anticipated reduction in the base return on equity authorized for the MISO transmission owners. Any further changes in FERC’s decisions may have an impact on Alliant Energy’s share of ATC’s future earnings and customer costs.

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NOTE 15.14. SEGMENTS OF BUSINESS
Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.
Alliant EnergyAlliant EnergyATC Holdings,AlliantAlliant EnergyATC Holdings,Alliant
UtilityNon-Utility,EnergyUtilityNon-Utility,Energy
ElectricGasOtherTotalParent and OtherConsolidatedElectricGasOtherTotalParent and OtherConsolidated
(in millions)(in millions)
Three Months Ended September 30, 2022Three Months Ended September 30, 2022
RevenuesRevenues$1,039$62$11$1,112$23$1,135
Operating income (loss)Operating income (loss)304(3)13027309
Net income (loss) attributable to Alliant Energy common shareownersNet income (loss) attributable to Alliant Energy common shareowners245(18)227
Three Months Ended September 30, 2021Three Months Ended September 30, 2021Three Months Ended September 30, 2021
RevenuesRevenues$939$50$13$1,002$22$1,024Revenues$939$50$13$1,002$22$1,024
Operating income (loss)Operating income (loss)290(5)(5)2809289Operating income (loss)290(5)(5)2809289
Net income attributable to Alliant Energy common shareownersNet income attributable to Alliant Energy common shareowners2506256Net income attributable to Alliant Energy common shareowners2506256
Three Months Ended September 30, 2020
Revenues$852$42$10$904$16$920
Operating income (loss)251(1)125121272
Net income attributable to Alliant Energy common shareowners22125246
Alliant EnergyAlliant EnergyATC Holdings,AlliantAlliant EnergyATC Holdings,Alliant
UtilityNon-Utility,EnergyUtilityNon-Utility,Energy
ElectricGasOtherTotalParent and OtherConsolidatedElectricGasOtherTotalParent and OtherConsolidated
(in millions)(in millions)
Nine Months Ended September 30, 2022Nine Months Ended September 30, 2022
RevenuesRevenues$2,624$418$35$3,077$70$3,147
Operating incomeOperating income68062474623769
Net income attributable to Alliant Energy common shareownersNet income attributable to Alliant Energy common shareowners5745579
Nine Months Ended September 30, 2021Nine Months Ended September 30, 2021Nine Months Ended September 30, 2021
RevenuesRevenues$2,357$289$36$2,682$60$2,742Revenues$2,357$289$36$2,682$60$2,742
Operating income (loss)Operating income (loss)60142(4)63924663Operating income (loss)60142(4)63924663
Net income attributable to Alliant Energy common shareownersNet income attributable to Alliant Energy common shareowners53734571Net income attributable to Alliant Energy common shareowners53734571
Nine Months Ended September 30, 2020
Revenues$2,257$253$32$2,542$57$2,599
Operating income54948560226628
Net income attributable to Alliant Energy common shareowners51040550
IPLElectricGasOtherTotal
(in millions)
Three Months Ended September 30, 2022
Revenues$596$33$11$640
Operating income (loss)174(3)171
Net income available for common stock154
Three Months Ended September 30, 2021
Revenues$555$31$13$599
Operating income (loss)186(3)(3)180
Net income available for common stock157
Nine Months Ended September 30, 2022
Revenues$1,438$224$34$1,696
Operating income353333389
Net income available for common stock327
Nine Months Ended September 30, 2021
Revenues$1,343$165$35$1,543
Operating income (loss)36530(1)394
Net income available for common stock322
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IPLElectricGasOtherTotal
(in millions)
Three Months Ended September 30, 2021
Revenues$555$31$13$599
Operating income (loss)186(3)(3)180
Net income available for common stock157
Three Months Ended September 30, 2020
Revenues$519$24$10$553
Operating income15912162
Net income available for common stock148
Nine Months Ended September 30, 2021
Revenues$1,343$165$35$1,543
Operating income (loss)36530(1)394
Net income available for common stock322
Nine Months Ended September 30, 2020
Revenues$1,332$141$31$1,504
Operating income308345347
Net income available for common stock290
WPLWPLElectricGasOtherTotalWPLElectricGasOtherTotal
(in millions)(in millions)
Three Months Ended September 30, 2022Three Months Ended September 30, 2022
RevenuesRevenues$443$29$—$472
Operating incomeOperating income1301131
Net incomeNet income91
Three Months Ended September 30, 2021Three Months Ended September 30, 2021Three Months Ended September 30, 2021
RevenuesRevenues$384$19$—$403Revenues$384$19$—$403
Operating income (loss)Operating income (loss)104(2)(2)100Operating income (loss)104(2)(2)100
Net incomeNet income93Net income93
Three Months Ended September 30, 2020
Nine Months Ended September 30, 2022Nine Months Ended September 30, 2022
RevenuesRevenues$333$18$—$351Revenues$1,186$194$1$1,381
Operating income (loss)92(2)(1)89
Operating incomeOperating income327291357
Net incomeNet income73Net income247
Nine Months Ended September 30, 2021Nine Months Ended September 30, 2021Nine Months Ended September 30, 2021
RevenuesRevenues$1,014$124$1$1,139Revenues$1,014$124$1$1,139
Operating income (loss)Operating income (loss)23612(3)245Operating income (loss)23612(3)245
Net incomeNet income215Net income215
Nine Months Ended September 30, 2020
Revenues$925$112$1$1,038
Operating income24114255
Net income220

NOTE 16.15. RELATED PARTIES
Service Agreements - Pursuant to service agreements, IPL and WPL receive various administrative and general services from an affiliate, Corporate Services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services, depreciation and amortization of property, plant and equipment, and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO. The amounts billed for services provided, sales credited and purchases for the three and nine months ended September 30 were as follows (in millions):
IPLWPLIPLWPL
Three MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine Months
2021202020212020202120202021202020222021202220212022202120222021
Corporate Services billingsCorporate Services billings$50$53$138$134$37$41$113$108Corporate Services billings$45$50$136$138$39$37$117$113
Sales creditedSales credited41093516234Sales credited11411931166223
Purchases billedPurchases billed10511034724824397179Purchases billed119105342347422410371

Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2021December 31, 2020September 30, 2021December 31, 2020
Net payables to Corporate Services$109$110$80$73
IPLWPL
September 30, 2022December 31, 2021September 30, 2022December 31, 2021
Net payables to Corporate Services$113$110$88$83

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ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):
Three MonthsNine MonthsThree MonthsNine Months
20212020202120202022202120222021
ATC billings to WPLATC billings to WPL$29$27$91$80ATC billings to WPL$38$29$107$91
WPL billings to ATCWPL billings to ATC42138WPL billings to ATC641413

WPL owed ATC net amounts of $8$9 million as of September 30, 20212022 and $9$10 million as of December 31, 2020.2021.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This MDA includes information relating to Alliant Energy, and IPL and WPL (collectively, the Utilities), as well as ATC Holdings, AEF and Corporate Services. Where appropriate, information relating to a specific entity has been segregated and labeled as such. The following discussion and analysis should be read in conjunction with the Financial Statements and the Notes included in this report, as well as the financial statements, notes and MDA included in the 20202021 Form 10-K. Unless otherwise noted, all “per share” references in MDA refer to earnings per diluted share.
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20212022 HIGHLIGHTS

Key highlights since the filing of the 20202021 Form 10-K include the following:

Customer Investments (referInvestments:
In response to Customer Investmentsa petition from a U.S.-based solar panel assembler, in March 2022, the U.S. Department of Commerce initiated an investigation into whether the sourcing of solar project materials and equipment from certain Southeast Asian countries circumvent tariffs and duties imposed on such materials and equipment imported from China. In June 2022, a presidential executive order postponed through 2024 any additional tariffs on solar project materials and equipment while the U.S. Department of Commerce completes its investigation. Alliant Energy, IPL and WPL are currently unable to predict with certainty the future outcome or impact of these matters, including from any related legal challenges; however, this could result in delays and/or higher costs for details):IPL’s and WPL’s planned development and acquisition of additional renewable energy, and impact Alliant Energy’s, IPL’s and WPL’s anticipated future construction and acquisition expenditures.
In March 2021, WPL filed its second Certificate of Authority withJune 2022, the PSCW for approvalissued an order approving WPL’s second certificate of authority to acquire, construct, own, and operate up to 414 MW of new solar generation in variousthe following Wisconsin counties.counties: Dodge (150 MW), Waushara (99 MW), Rock (65 MW), Grant (50 MW) and Green (50 MW).
In June 2021, WPL received an order from the PSCW for its first Certificate of Authority authorizing WPL to acquire, own and operate 675 MW of new solar generation in various Wisconsin counties.
In November 2021,2022, IPL filed for a revised fixed cost cap of $1,934/kilowatt with the IUB related to IPL’s November 2021 advance rate-making principles with the IUBfiling for up to 400 MW of new solar generation with in-service dates in 2023 and up to2024 and approximately 75 MW of battery storage in 2024, which reflects higher materials, labor and shipping costs. The revised fixed cost cap includes allowance for funds used during construction and transmission upgrade costs among other costs. In September 2022, IPL provided the IUB with a summary of the Inflation Reduction Act of 2022, as well as an economic analysis indicating full ownership for its planned solar and battery storage projects is currently expected to result in lower costs for its customers compared to previous plans to utilize tax equity financing. IPL currently expects a decision from the IUB on its filing by the end of 2022.
In August 2022, FERC approved MISO’s proposal to change its methodology for procuring capacity in the energy market effective with the 2023/2024 MISO Planning Year, as a result of changes in the overall generation resource mix due to the shift to renewable generation and the retirement of certain fossil-fueled generation. The capacity construct will change from the current Summer-based annual construct to four distinct seasons to help ensure the continued reliability of the electric transmission grid. FERC’s approval also includes establishing planning reserve margin requirements for all market participants on a seasonal basis and determining a seasonal accredited capacity value for certain classes of generating resources, including higher accredited capacity for wind generation during the Spring, Fall and Winter seasons and lower accredited capacity for solar generation during the Winter season. Alliant Energy, IPL and WPL are currently unable to predict with certainty the future outcome or impact of these matters, but anticipate additional generating resources will be needed to comply with the requirements of the new capacity construct. Refer to “Liquidity and Capital Resources” for discussion of proposed changes to IPL’s and WPL’s current resource plans resulting from these matters.
In September 2022, WPL filed a request with the PSCW for approval to construct, own and operate 175 MW of battery storage.storage, with 100 MW and 75 MW at the Grant County and Wood County solar projects, respectively. Estimated capital expenditures for these planned projects for 2023 through 2025 are included in the “Renewables and battery storage” line in the construction and acquisition table in “Liquidity and Capital Resources.”
In September 2022, after the enactment of the Inflation Reduction Act of 2022, WPL informed the PSCW of its decision to retain full ownership of its planned solar projects instead of financing a portion of the projects with tax equity partners, which is currently expected to result in lower costs for its customers compared to previous plans to utilize tax equity financing.
In September 2022, WPL completed the construction of the Bear Creek Solar Garden in Richland County, Wisconsin (50 MW).
In October 2022, WPL completed the construction of the North Rock Solar Garden in Rock County, Wisconsin (50 MW).
Refer to Note 3 for discussion of revised expected timing for the retirements of various IPL and WPL coal-fired EGUs.

Rate Matters:
In May 2021,June 2022, WPL filed a proposed settlementlimited reopener request with the PSCW to increase annual retail gas rates for annual base rate increases of $70 million and $15 million for WPL’s retail electric and gas customers, respectively, covering the 2022/2023 forward-looking Test Period by approximately $10 million, which was based onreflects changes in weighted average cost of capital, updated depreciation rates and modifications to certain regulatory asset and regulatory liability amortizations. WPL currently expects a stipulated agreement between WPL and certain intervenor groups. In November 2021, WPL filed updated information withdecision from the PSCW to reflect anticipated increases in retail fuel-related costs in 2022. As a result, annual rates for WPL’s retail electric customers are currently expected to increase by an additional $45 million in 2022, for a total of $115 million. The key drivers for the proposed annual base rate increases include lower excess deferred income tax benefits in 2022 and 2023 and revenue requirement impacts of increasing electric and gas rate base, including investments in solar generation. In addition, the settlement proposes WPL maintainon its current authorized return on common equity of 10%, implement a 54% common equity component of regulatory capital structure, as well as receive a recovery of and a return on the remaining net book value of Edgewater Unit 5, which is currently expected to be retiredrequest by the end of 2022. WPL currently expects any rate changes granted from this request to be effective on January 1, 2022 and extend through the end of 2023.
In June 2021, the IUB adopted new rules that establish minimum filing requirements for rate reviews using a forward-looking test period, and the related subsequent proceeding review after the close of the forward-looking test period. The rules provide that in the subsequent proceeding review, a utility’s actual costs and revenues shall be presumed to be reasonably consistent with the forward-looking test period if the utility’s actual return on common equity falls within a standard of reasonableness of 50 basis points above to 50 basis points below the authorized return on common equity. If the utility’s actual return on common equity is outside of this range, future rates could be adjusted.
In August 2021,2022, the IUB issued an order for IPL’s 2020 forward-looking Test Period gas subsequent proceeding, authorizing IPLPSCW authorized WPL to maintaincollect $37 million in 2023 from its current retail gas rates.
In November 2021, the IUB issued an order for IPL’s 2020 forward-looking Test Period electric subsequent proceeding, authorizing IPL to maintain its current retail electric rates.

Legislative Matters:
customers, plus interest, for an under-collection of fuel-related costs incurred by WPL in 2021 that were higher than fuel-related costs used to determine rates for such period. In March 2021,addition, in November 2022, WPL filed updated fuel-related cost information for 2023 with the American Rescue Plan ActPSCW, which reflects an increase in annual retail electric rates of 2021 (Act) was enacted. The most significant provisionapproximately $63 million in 2023 compared to WPL’s approved 2022 fuel-related costs. WPL currently expects a decision from the PSCW on its request by the end of the Act for Alliant Energy is reduced minimum pension plan funding requirements, which Alliant Energy adopted in August 2021. The Act also provides additional funding to the Low Income Home Energy Assistance Program, which assists certain of Alliant Energy’s customers with managing their energy costs, as well as provides financial support for certain of Alliant Energy’s residential, small business and non-profit customers.
In April 2021, legislation was enacted in Iowa prohibiting counties and cities from regulating the sale of natural gas and propane, which supports IPL’s ability to provide gas utility service to a diversified base of retail customers and industries.

2022.
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WPL currently expects to file a retail electric and gas rate review with the PSCW in the second quarter of 2023 for the 2024/2025 forward-looking Test Period. The key drivers for the anticipated filing include revenue requirement impacts of increasing electric and gas rate base, including investments in solar generation and battery storage. Any rate changes granted from this pending request are expected to be effective on January 1, 2024, with a decision from the PSCW expected by the end of 2023.
IPL currently expects to file a retail electric and gas rate review with the IUB by the first half of 2024. The key drivers for the anticipated filing include revenue requirement impacts of increasing electric and gas rate base, including investments in solar generation and battery storage.

Legislative Matters:
Refer to Note 9 for discussion of Iowa tax reform enacted in March 2022.
In August 2022, the Inflation Reduction Act of 2022 was enacted. The most significant provisions of the new legislation for Alliant Energy, IPL and WPL relate to a 10-year extension of tax credits for clean energy projects, a new production tax credit eligible for solar projects, a new stand-alone investment tax credit for battery storage projects and the right to transfer future renewable credits to other corporate taxpayers. The new legislation also includes a requirement for corporations with income over $1 billion to pay a 15% minimum tax; however, Alliant Energy is currently below this income level. Alliant Energy, IPL and WPL currently expect to utilize various provisions of the new legislation to enhance the tax benefits expected from their announced approximately 1,500 MW of solar and 250 MW of battery storage projects, including transferring the future tax credits from such projects to other corporate taxpayers and opting to retain full ownership of such projects instead of financing a portion of the projects with tax equity partners. Compared to previous plans to utilize tax equity financing, the impact of these changes is expected to result in lower costs for IPL's and WPL's customers, higher rate base amounts, additional financing needs expected to be satisfied with additional long-term debt and common stock issuances, and improvements in long-term cash flows over the life of the solar and battery storage projects.

Financings and Common Stock Dividends:
In September 2021, WPL issued $300 million of 1.95% debentures due 2031. The debentures were issued as green bonds, and an amount equal to or in excess of the net proceeds will be disbursed for the construction and development of WPL’s wind and solar EGUs.
Refer to “Results of Operations” for discussion of expected future issuances of common stock dividendsand common stock dividends, and expected future issuances and retirements of long-term debt, by the end of 2022.2023.

RESULTS OF OPERATIONS

Results of operations include financial information prepared in accordance with GAAP as well as utility electric margins and utility gas margins, which are not measures of financial performance under GAAP. Utility electric margins are defined as electric revenues less electric production fuel, purchased power and electric transmission service expenses. Utility gas margins are defined as gas revenues less cost of gas sold. Utility electric margins and utility gas margins are non-GAAP financial measures because they exclude other utility and non-utility revenues, other operation and maintenance expenses, depreciation and amortization expenses, and taxes other than income tax expense.

Management believes that utility electric and gas margins provide a meaningful basis for evaluating and managing utility operations since electric production fuel, purchased power and electric transmission service expenses and cost of gas sold are generally passed through to customers, and therefore, result in changes to electric and gas revenues that are comparable to changes in such expenses. The presentation of utility electric and gas margins herein is intended to provide supplemental information for investors regarding operating performance. These utility electric and gas margins may not be comparable to how other entities define utility electric and gas margin. Furthermore, these measures are not intended to replace operating income as determined in accordance with GAAP as an indicator of operating performance.

Additionally, the table below includes EPS for Utilities and Corporate Services, ATC Holdings, and Non-utility and Parent, which are non-GAAP financial measures. Alliant Energy believes these non-GAAP financial measures are useful to investors because they facilitate an understanding of segment performance and trends, and provide additional information about Alliant Energy’s operations on a basis consistent with the measures that management uses to manage its operations and evaluate its performance.

Financial Results Overview - Alliant Energy’s net income and EPS attributable to Alliant Energy common shareowners for the three months ended September 30 were as follows (dollars in millions, except per share amounts):
2021202020222021
Income (Loss)EPSIncomeEPSIncome (Loss)EPSIncome (Loss)EPS
Utilities and Corporate ServicesUtilities and Corporate Services$254$1.01$224$0.89Utilities and Corporate Services$249$0.99$254$1.01
ATC HoldingsATC Holdings80.0380.03ATC Holdings50.0280.03
Non-utility and ParentNon-utility and Parent(6)(0.02)140.06Non-utility and Parent(27)(0.11)(6)(0.02)
Alliant Energy ConsolidatedAlliant Energy Consolidated$256$1.02$246$0.98Alliant Energy Consolidated$227$0.90$256$1.02

Alliant Energy’s Utilities and Corporate Services net income increaseddecreased by $30$5 million for the three-month period, primarily due to higher earnings resulting from IPL’s and WPL’s increasing rate base, as well as higher sales due in part to the derecho windstorm in Iowa and COVID-19 sales impacts in the third quarter of 2020. These items were partially offset by higher depreciationinterest expense and lower AFUDC.

Alliant Energy’s Non-utility and Parent net income decreased by $20 million for the three-month period, primarily due to an adjustment in 2020 to the credit loss liability related to legacy guarantees associated with an affiliate of Whiting Petroleum and timing of income taxes.

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Alliant Energy’s Non-utility and Parent net income decreased by $21 million for the three-month period, primarily due to higher interest expense, the timing of income taxes and the impact of the Iowa corporate income tax rate change.

For the three and nine months ended September 30, operating income and a reconciliation of utility electric and gas margins to the most directly comparable GAAP measure, operating income, was as follows (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Three MonthsThree Months202120202021202020212020Three Months202220212022202120222021
Operating incomeOperating income$289$272$180$162$100$89Operating income$309$289$171$180$131$100
Electric utility revenuesElectric utility revenues$939$852$555$519$384$333Electric utility revenues$1,039$939$596$555$443$384
Electric production fuel and purchased power expensesElectric production fuel and purchased power expenses(207)(179)(101)(102)(105)(78)Electric production fuel and purchased power expenses(274)(207)(140)(101)(134)(105)
Electric transmission service expenseElectric transmission service expense(148)(132)(103)(93)(44)(39)Electric transmission service expense(157)(148)(115)(103)(42)(44)
Utility Electric Margin (non-GAAP)Utility Electric Margin (non-GAAP)584541351324235216Utility Electric Margin (non-GAAP)608584341351267235
Gas utility revenuesGas utility revenues504231241918Gas utility revenues625033312919
Cost of gas soldCost of gas sold(18)(11)(12)(6)(6)(4)Cost of gas sold(26)(18)(14)(12)(13)(6)
Utility Gas Margin (non-GAAP)Utility Gas Margin (non-GAAP)323119181314Utility Gas Margin (non-GAAP)363219191613
Other utility revenuesOther utility revenues13101310Other utility revenues11131113
Non-utility revenuesNon-utility revenues2216Non-utility revenues2322
Other operation and maintenance expensesOther operation and maintenance expenses(171)(143)(95)(85)(66)(65)Other operation and maintenance expenses(172)(171)(90)(95)(70)(66)
Depreciation and amortization expensesDepreciation and amortization expenses(165)(156)(94)(89)(70)(65)Depreciation and amortization expenses(169)(165)(95)(94)(71)(70)
Taxes other than income tax expenseTaxes other than income tax expense(26)(27)(14)(16)(12)(11)Taxes other than income tax expense(28)(26)(15)(14)(11)(12)
Operating incomeOperating income$289$272$180$162$100$89Operating income$309$289$171$180$131$100
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Nine MonthsNine Months202120202021202020212020Nine Months202220212022202120222021
Operating incomeOperating income$663$628$394$347$245$255Operating income$769$663$389$394$357$245
Electric utility revenuesElectric utility revenues$2,357$2,257$1,343$1,332$1,014$925Electric utility revenues$2,624$2,357$1,438$1,343$1,186$1,014
Electric production fuel and purchased power expensesElectric production fuel and purchased power expenses(478)(527)(215)(304)(263)(223)Electric production fuel and purchased power expenses(633)(478)(290)(215)(343)(263)
Electric transmission service expenseElectric transmission service expense(403)(326)(274)(212)(128)(114)Electric transmission service expense(428)(403)(303)(274)(125)(128)
Utility Electric Margin (non-GAAP)Utility Electric Margin (non-GAAP)1,4761,404854816623588Utility Electric Margin (non-GAAP)1,5631,476845854718623
Gas utility revenuesGas utility revenues289253165141124112Gas utility revenues418289224165194124
Cost of gas soldCost of gas sold(149)(117)(84)(63)(65)(53)Cost of gas sold(242)(149)(126)(84)(117)(65)
Utility Gas Margin (non-GAAP)Utility Gas Margin (non-GAAP)14013681785959Utility Gas Margin (non-GAAP)17614098817759
Other utility revenuesOther utility revenues3632353111Other utility revenues3536343511
Non-utility revenuesNon-utility revenues6057Non-utility revenues7060
Other operation and maintenance expensesOther operation and maintenance expenses(477)(465)(253)(269)(194)(172)Other operation and maintenance expenses(492)(477)(260)(253)(193)(194)
Depreciation and amortization expensesDepreciation and amortization expenses(494)(454)(281)(264)(209)(186)Depreciation and amortization expenses(501)(494)(285)(281)(211)(209)
Taxes other than income tax expenseTaxes other than income tax expense(78)(82)(42)(45)(35)(35)Taxes other than income tax expense(82)(78)(43)(42)(35)(35)
Operating incomeOperating income$663$628$394$347$245$255Operating income$769$663$389$394$357$245

Operating Income Variances - Variances between periods in operating income for the three and nine months ended September 30, 20212022 compared to the same periods in 20202021 were as follows (in millions):
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Total higher utility electric margin variance (Refer to details below)$43$27$19$72$38$35
Total higher (lower) utility gas margin variance (Refer to details below)11(1)43
Total (higher) lower other operation and maintenance expenses variance (Refer to details below)(28)(10)(1)(12)16(22)
Higher depreciation and amortization expense primarily due to additional plant in service in 2020 and 2021, including IPL’s new wind generation, and WPL’s West Riverside Energy Center and Kossuth wind farm(9)(5)(5)(40)(17)(23)
Other105(1)117
$17$18$11$35$47($10)
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Total higher (lower) utility electric margin variance (Refer to details below)$24($10)$32$87($9)$95
Total higher utility gas margin variance (Refer to details below)43361718
Total (higher) lower other operation and maintenance expenses variance (Refer to details below)(1)5(4)(15)(7)1
Total higher depreciation and amortization expense(4)(1)(1)(7)(4)(2)
Other(3)(3)15(2)
$20($9)$31$106($5)$112

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Electric and Gas Revenues and Sales Summary - Electric and gas revenues (in millions), and MWh and Dth sales (in thousands), for the three and nine months ended September 30 were as follows:
Alliant EnergyAlliant EnergyElectricGasAlliant EnergyElectricGas
RevenuesMWhs SoldRevenuesDths SoldRevenuesMWhs SoldRevenuesDths Sold
2021202020212020202120202021202020222021202220212022202120222021
Three MonthsThree MonthsThree Months
RetailRetail$845$7797,0316,762$40$343,2643,500Retail$908$8456,7887,031$50$403,5843,264
Sales for resaleSales for resale78541,8531,453N/AN/AN/AN/ASales for resale115781,7591,853N/AN/AN/AN/A
Transportation/OtherTransportation/Other1619181710826,36524,842Transportation/Other16161618121030,98226,365
$939$8528,9028,232$50$4229,62928,342$1,039$9398,5638,902$62$5034,56629,629
Nine MonthsNine MonthsNine Months
RetailRetail$2,124$2,04919,26218,496$258$22433,29932,545Retail$2,327$2,12419,30419,262$379$25837,28433,299
Sales for resaleSales for resale1811624,4114,962N/AN/AN/AN/ASales for resale2511815,1614,411N/AN/AN/AN/A
Transportation/OtherTransportation/Other52465353312974,11179,546Transportation/Other46524653393183,24174,111
$2,357$2,25723,72623,511$289$253107,410112,091$2,624$2,35724,51123,726$418$289120,525107,410
IPLIPLElectricGasIPLElectricGas
RevenuesMWhs SoldRevenuesDths SoldRevenuesMWhs SoldRevenuesDths Sold
2021202020212020202120202021202020222021202220212022202120222021
Three MonthsThree MonthsThree Months
RetailRetail$525$4803,9143,743$25$191,7021,873Retail$559$5253,7363,914$25$251,7391,702
Sales for resaleSales for resale2125487765N/AN/AN/AN/ASales for resale2821581487N/AN/AN/AN/A
Transportation/OtherTransportation/Other91499659,3089,020Transportation/Other9999869,7439,308
$555$5194,4104,517$31$2411,01010,893$596$5554,3264,410$33$3111,48211,010
Nine MonthsNine MonthsNine Months
RetailRetail$1,259$1,22710,81010,414$145$12217,26816,950Retail$1,358$1,25910,82110,810$199$14519,11817,268
Sales for resaleSales for resale49751,1603,090N/AN/AN/AN/ASales for resale53491,6001,160N/AN/AN/AN/A
Transportation/OtherTransportation/Other35302627201929,72729,127Transportation/Other27352526252031,91729,727
$1,343$1,33211,99613,531$165$14146,99546,077$1,438$1,34312,44611,996$224$16551,03546,995
WPLWPLElectricGasWPLElectricGas
RevenuesMWhs SoldRevenuesDths SoldRevenuesMWhs SoldRevenuesDths Sold
2021202020212020202120202021202020222021202220212022202120222021
Three MonthsThree MonthsThree Months
RetailRetail$320$2993,1173,019$15$151,5621,627Retail$349$3203,0523,117$25$151,8451,562
Sales for resaleSales for resale57291,366688N/AN/AN/AN/ASales for resale87571,1781,366N/AN/AN/AN/A
Transportation/OtherTransportation/Other75984317,05715,822Transportation/Other77794421,23917,057
$384$3334,4923,715$19$1818,61917,449$443$3844,2374,492$29$1923,08418,619
Nine MonthsNine MonthsNine Months
RetailRetail$865$8228,4528,082$113$10216,03115,595Retail$969$8658,4838,452$180$11318,16616,031
Sales for resaleSales for resale132873,2511,872N/AN/AN/AN/ASales for resale1981323,5613,251N/AN/AN/AN/A
Transportation/OtherTransportation/Other17162726111044,38450,419Transportation/Other19172127141151,32444,384
$1,014$92511,7309,980$124$11260,41566,014$1,186$1,01412,06511,730$194$12469,49060,415

Sales Trends and Temperatures - Alliant Energy’s retail electric and gas sales volumes increased 4%decreased 3% and decreased 7%, respectively,were unchanged for the three months ended September 30, 2021 compared to the same period in 2020, primarily due to COVID-19 impacts in Alliant Energy’s service territories, impacts from the derecho windstorm in IPL’s service territory in August 2020 and changes in temperatures. Alliant Energy’s retail electric and gas sales volumes increased 4% and 2%, respectively, for the nine months ended September 30, 2021 compared to the same period in 2020, primarily due to changes in temperatures, COVID-19 impacts in Alliant Energy’s service territories and impacts from the derecho windstorm in IPL’s service territory in August 2020, partially offset by the impact on sales of the additional day due to leap year in 2020. For the three and nine months ended September 30, 2022 compared to the same periods in 2021, respectively, primarily due to changes in COVID-19 impacts resulted in decreases for retail electric residential sales volumes and increases for retail electricof commercial and industrial sales.customers due to standby service customers that can use other generation, as well as maintenance outages at certain large customers. Alliant Energy’s retail gas sales volumes increased 10% and 12% for the three and nine months ended September 30, 2022 compared to the same periods in 2021, respectively, primarily due to changes in temperatures and increases in the number of retail customers.

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Estimated increases (decreases) to electric and gas margins from the impacts of temperatures for the three and nine months ended September 30 were as follows (in millions):
Electric MarginsGas MarginsElectric MarginsGas Margins
Three MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine MonthsThree MonthsNine Months
20212020Change20212020Change20212020Change20212020Change20222021Change20222021Change20222021Change20222021Change
IPLIPL$5$3$2$16$2$14($1)$—($1)$1 $— $1 IPL$4$5($1)$15$16($1)$—($1)$1$4$1$3
WPLWPL3(3)936 (1)WPL109122
Total Alliant EnergyTotal Alliant Energy$5$6($1)$25$5$20($1)$—($1)$1 ($1)$2 Total Alliant Energy$4$5($1)$25$25$—$—($1)$1$6$1$5

Electric Sales for Resale - Electric sales for resale volume changes were largely due to changes in sales in the wholesale energy markets operated by MISO. These changes are impacted by several factors, including the availability and dispatch of Alliant Energy’s EGUs and electricity demand within these wholesale energy markets. Changes in sales for resale revenues were largely offset by changes in fuel-related costs, and therefore, did not have a significant impact on electric margins.

Gas Transportation/Other - Gas transportation/other sales volume changes were largely due to changes in the gas volumes supplied to Alliant Energy’s natural gas-fired EGUs caused by the availability and dispatch of such EGUs. Changes in these transportation/other revenues did not have a significant impact on gas margins.

Utility Electric Margin Variances - The following items contributed to increased (decreased) utility electric margins for the three and nine months ended September 30, 20212022 compared to the same periods in 20202021 as follows (in millions):
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Higher revenue requirements due to increasing rate base (a) (b)$12$9$3$38$28$10
Estimated changes in sales volumes caused by temperatures(1)2(3)20146
Higher wholesale margins at WPL partially due to a new wholesale customer in 20212244
Lower revenues at IPL related to changes in recovery amounts for energy efficiency costs through the energy efficiency rider (mostly offset by changes in energy efficiency expense)(3)(3)(11)(11)
Higher (lower) revenues at IPL due to changes in credits on customers’ bills related to excess deferred income tax benefits amortization through the tax benefit rider (offset by changes in income tax)88(4)(4)
(Higher) lower WPL electric fuel-related costs, net of recoveries55(2)(2)
Other (includes higher temperature-normalized sales primarily due to derecho windstorm in 2020 and COVID-19 impacts)201112271117
$43$27$19$72$38$35
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Higher revenue requirements at WPL due to increasing rate base (a)$32$—$32$85$—$85
Higher revenues at IPL due to changes in credits on customers’ bills related to excess deferred income tax benefits amortization through the tax benefit rider (offset by changes in income tax)1111
Lower revenues at IPL due to changes in the renewable energy rider (mostly offset by changes in income tax)(4)(4)(23)(23)
Other(4)(6)14310
$24($10)$32$87($9)$95

(a)IPL’s final retail electric base rate increase was effective February 26, 2020. Effective with final rates, the recovery of, and return on, IPL’s new wind generation placed in service in 2019 and 2020 is provided through the renewable energy rider. The final rate increase includes a reduction for anticipated production tax credits for IPL’s new wind generation. This reduction is expected to be offset by a reduction in income tax expense resulting from production tax credits recognized from this new wind generation. In September 2020, IPL made a buyout payment of $110 million in exchange for shortening the terms of its DAEC PPA by 5 years. The higher revenue requirements from the buyout payment, including a return on such costs, is being recovered from IPL’s retail customers from 2021 through the end of 2025.
(b)In December 2020,2021, the PSCW issued an order authorizing WPL to maintain its currentannual base rate increases of $114 million and $15 million for WPL’s retail electric and gas customers, respectively, covering the 2022/2023 forward-looking Test Period, which was based on a stipulated agreement between WPL and certain stakeholders. The key drivers for the annual base rates through the end of 2021. WPL will utilize anticipatedrate increases include higher retail fuel-related cost savings andcosts in 2022, lower excess deferred income tax benefits in 2022 and 2023 compared to 2021, to offset theand revenue requirement impacts of increasing electric and gas rate base, including investments in solar generation. Retail electric rate changes were effective on January 1, 2022 and extend through the Kossuth wind farm, which was placed in service in October 2020.end of 2023. Retail gas rate changes were effective on January 1, 2022 and extend through the end of 2022. The lowerhigher fuel expense benefitscosts are recognized in electric margin and the additionallower amount of excess deferred income tax benefits is recognized as a reduction in income tax expense.tax.

Utility Gas Margin Variances - The following items contributed to increased (decreased) utility gas margins for the three and nine months ended September 30, 20212022 compared to the same periods in 20202021 as follows (in millions):
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Estimated changes in sales volumes caused by temperatures($1)($1)$—$2$1$1
Other22(1)22(1)
$1$1($1)$4$3$—
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Higher revenues at IPL related to changes in recovery amounts for energy efficiency costs through the energy efficiency rider (mostly offset by changes in energy efficiency expense)$1$1$—$12$12$—
Higher revenue requirements at WPL due to increasing rate base (refer to (a) above)111010
Other (includes higher sales in 2022)2(1)21458
$4$—$3$36$17$18

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Other Operation and Maintenance Expenses Variances - The following items contributed to (increased) decreased other operation and maintenance expenses for the three and nine months ended September 30, 20212022 compared to the same periods in 20202021 as follows (in millions):
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Higher generation operation and maintenance expenses($10)($8)($2)($21)($12)($9)
Credit loss adjustments in 2020 related to guarantees for an affiliate of Whiting Petroleum(15)(7)
Lower energy efficiency expense at IPL (primarily offset by lower revenues)221010
(Higher) lower bad debt expense at IPL(2)(2)88
Other(3)(2)1(2)10(13)
($28)($10)($1)($12)$16($22)
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Higher energy efficiency expense at IPL (mostly offset by higher revenues)$—$—$—($8)($8)$—
Non-utility Travero (mostly offset by higher revenues)(2)(9)
Other15(4)211
($1)$5($4)($15)($7)$1

Other Income and Deductions Variances - The following items contributed to increased(increased) decreased other income and deductions for the three and nine months ended September 30, 20212022 compared to the same periods in 20202021 as follows (in millions):
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Lower interest expense$—$1$1$1$1$1
Lower AFUDC primarily due to changes in construction work in progress balances related to IPL’s new wind generation, and WPL’s West Riverside Energy Center and Kossuth wind farm placed in service in 2020(6)(4)(1)(35)(14)(20)
Other(2)1(1)11
($8)($2)($1)($33)($12)($19)
Three MonthsNine Months
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Higher interest expense primarily due to financings completed in 2022 and 2021 and higher interest rates($15)($3)($6)($29)($8)($9)
(Lower) higher equity income from unconsolidated investments, net (refer to Note 5 for details)
(8)(10)1
Higher AFUDC primarily due to changes in construction work in progress balances related to WPL’s solar generation31218117
Other312742
($17)($1)($2)($14)($3)$11

Income Taxes - Refer to Note 9 for details of effective income tax rates.

Preferred Dividend Requirements of IPL - Alliant Energy’s and IPL’s preferred dividend requirements decreased for the three and nine months ended September 30, 2022 compared to the same periods in 2021 due to the redemption of IPL’s 5.1% cumulative preferred stock in December 2021.

Other Future Considerations - In addition to items discussed in this report, the following key items could impact Alliant Energy’s, IPL’s and WPL’s future financial condition or results of operations:
Financing Plans - In the fourth quarter of 2021, IPLAlliant Energy currently expects to issue up to $300$250 million of long-term debtcommon stock in 2023 through one or more offerings and redeem all of its cumulative preferred stock at par value for approximately $200 million plus accrued and unpaid dividends upShareowner Direct Plan. IPL, WPL (subject to the redemption date. WPLregulatory approval) and AEF currently expect to issue up to $300 million, $300 million, and $800$450 million of long-term debt, respectively, in 2022.by the end of 2023. WPL AEF and Corporate ServicesAEF have $250 million $300 million and $75$400 million of long-term debt maturing in 2022 and 2023, respectively. Alliant Energy currently expects to issue approximately $25 million of common stock in 2022 through its Shareowner Direct Plan.
Common Stock Dividends - Alliant Energy announced a 6% increase in its targeted 20222023 annual common stock dividend to $1.71$1.81 per share, which is equivalent to a quarterly rate of $0.4275$0.4525 per share, beginning with the February 20222023 dividend payment. The timing and amount of future dividends is subject to an approved dividend declaration from Alliant Energy’s Board of Directors, and is dependent upon earnings expectations, capital requirements, and general financial business conditions, among other factors.
Higher Earnings on Increasing Rate Base - Alliant Energy and WPL currently expect an increase in earnings in 20222023 compared to 20212022 due to impacts from increasing revenue requirements related to investments in the utility business, including WPL’s solar investments. WPL’s increased revenue requirements are expected to be offset by higher income tax expense as a result of lower tax benefits.
Other Operation and Maintenance Expenses - Alliant Energy, IPL and WPL currently expect a decrease in other operation and maintenance expenses in 20222023 compared to 20212022 largely due to cost reductions resulting from operating efficiencies.
Depreciation and Amortization Expenses - Alliant Energy, IPL and WPL currently expect an increase in depreciation and amortization expenses in 2022 compared to 2021 due to property additions, including WPL’s expansion of solar generation.
Interest Expense - Alliant Energy, IPL and WPL currently expect an increase in interest expense in 20222023 compared to 20212022 due to financings completed in 20212022 and planned in 2021 and 2022 as discussed above.
Allowance for Funds Used During Construction - Alliant Energy and WPL currently expect AFUDC to increase in 2022 compared to 2021 primarily due to increased construction work in progress balances related to WPL’s solar generation.

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CUSTOMER INVESTMENTS

Renewable Generation
Alliant Energy’s cleaner energy strategy, or Clean Energy Blueprints, currently includes the planned development and acquisition of additional renewable energy, including approximately 1,100 MW of solar generation at WPL with in-service dates in 2022-2024, approximately 400 MW of solar generation at IPL with in-service dates in 2023-2024 and approximately 75 MW of battery storage in 2024 at IPL. Alliant Energy, IPL and WPL continue to evaluate additional opportunities to add more renewable generation, including wind repowering, and additional solar generation and distributed energy resources, including community solar and energy storage systems. Estimated capital expenditures for these projects for 2021 through 2025 are included in the “Renewable projects” line in the construction and acquisition table in “Liquidity and Capital Resources.” These estimates include current expectations for higher costs for various projects, as supply constraints and commodity inflation continue to be prevalent in the solar market. In addition, these estimates reflect later expected in-service dates for certain solar projects to reflect the tight market for solar panels. IPL and WPL currently assume that a portion of the construction costs for the new solar generation will be financed by a tax equity partner, which is discussed in “IPL and WPL Solar Project Tax Equity Credits” in “Liquidity and Capital Resources.”

WPL’s Solar Generation and Distributed Energy Resources - In June 2021, WPL received an order from the PSCW for its first Certificate of Authority authorizing WPL to acquire, own and operate 675 MW of new solar generation in the following Wisconsin counties: Grant (200 MW), Sheboygan (150 MW), Wood (150 MW), Jefferson (75 MW), Richland (50 MW) and Rock (50 MW). In July 2021, WPL notified the PSCW that it currently expects estimated construction costs and related rate base additions associated with its 675 MW of new solar generation will exceed amounts approved by the PSCW in June 2021 by approximately 7-10%. In September 2021, WPL filed revised estimated construction costs and related rate base additions for its second Certificate of Authority with the PSCW for approval to acquire, construct, own, and operate up to 414 MW of new solar generation in the following Wisconsin counties: Dodge (150 MW), Waushara (99 MW), Rock (65 MW), Grant (50 MW) and Green (50 MW). These projects are expected to be placed in-service in 2022-2024. The 1,089 MW of new solar generation would replace energy and capacity being eliminated with the planned retirement of the coal-fired Edgewater Generating Station (414 MW) by the end of 2022, and Columbia Unit 1 by the end of 2023 and Columbia Unit 2 by the end of 2024 (595 MW in aggregate), which are the last coal-fired EGUs at WPL. The retirement of these coal-fired EGUs supports Alliant Energy’s strategy, which is focused on meeting its customers’ energy needs in an economical, efficient and sustainable manner. As a result of WPL’s neighboring utilities anticipated exercise of their options to purchase a partial ownershipas discussed above, as well as expected higher interest in West Riverside, WPL anticipates additional capacity needs by 2024, which may include additional solar generation and distributed energy resources such as community solar and energy storage systems.

IPL’s Solar Generation and Distributed Energy Resources - In November 2021, IPL filed for advance rate-making principles with the IUB for up to 400 MW of solar generation with in-service dates in 2023 and 2024 and approximately 75 MW of battery storage in 2024. The advance rate-making principles filing included requests for a fixed cost cap of $1,575/kilowatt, including AFUDC and transmission upgrade costs among other costs, and a return on common equity of 11.40%, and proposes that a portion of the construction be financed by tax equity partners. In addition, the filing included a request that any costs incurred in excess of the cost cap be incorporated into rates if determined to be reasonable and prudent. The 400 MW of new solar generation and 75 MW of battery storage would help replace a portion of the energy and capacity expected to be eliminated with the planned retirement of the coal-fired Lansing Generating Station (275 MW) by the end of 2022 and the expected reduction of energy and capacity resulting from the planned fuel switch of the Burlington Generating Station (212 MW) from coal to natural gas by the end of 2021. In addition, IPL’s plans include additional distributed energy resources, including community solar and energy storage systems, to add energy and capacity.rates.

LIQUIDITY AND CAPITAL RESOURCES

The liquidity and capital resources summary included in the 20202021 Form 10-K has not changed materially, except as described below.

Liquidity Position - At September 30, 2021,2022, Alliant Energy had $20$344 million of cash and cash equivalents, $684$617 million ($18767 million at the parent company, $100$250 million at IPL and $397$300 million at WPL) of available capacity under the single revolving credit facility and $60$109 million of available capacity at IPL under its sales of accounts receivable program.

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Capital Structure - Capital structures at September 30, 20212022 were as follows (Long-term Debt (including current maturities) (LD); Short-term Debt (SD); Common Equity (CE); IPL’s Preferred Stock (PS)):
lnt-20210930_g2.jpglnt-20210930_g3.jpglnt-20210930_g4.jpglnt-20220930_g2.jpglnt-20220930_g3.jpglnt-20220930_g4.jpg
Cash Flows - Selected information from the cash flows statements was as follows (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
202120202021202020212020202220212022202120222021
Cash, cash equivalents and restricted cash, January 1Cash, cash equivalents and restricted cash, January 1$56$18$50$9$3$4Cash, cash equivalents and restricted cash, January 1$40$56$34$50$2$3
Cash flows from (used for):Cash flows from (used for):Cash flows from (used for):
Operating activitiesOperating activities4774369519349402Operating activities48547716695279349
Investing activitiesInvesting activities(452)(679)122(202)(510)(465)Investing activities(599)(452)84122(612)(510)
Financing activitiesFinancing activities(57)419(254)35916261Financing activities421(57)(239)(254)630162
Net increase (decrease)Net increase (decrease)(32)176(37)1761(2)Net increase (decrease)307(32)11(37)2971
Cash, cash equivalents and restricted cash, September 30Cash, cash equivalents and restricted cash, September 30$24$194$13$185$4$2Cash, cash equivalents and restricted cash, September 30$347$24$45$13$299$4

Operating Activities - The following items contributed to increased (decreased) operating activity cash flows for the nine months ended September 30, 20212022 compared to the same period in 20202021 (in millions):
Alliant EnergyIPLWPL
DAEC PPA amendment buyout payment in 2020$110$110$—
Credits issued to IPL’s retail electric customers in 2020 through its transmission cost rider for amounts previously collected in rates4242
Increased collections from IPL’s and WPL’s retail customers caused by temperature impacts on electric and gas sales22157
Changes in the sales of accounts receivable at IPL(68)(68)
Refunds received in 2020 related to the MISO transmission owner return on equity complaint FERC orders(20)(15)(5)
Higher natural gas cost payments primarily from extreme temperatures in February 2021 resulting in under-recovered natural gas costs at IPL (Refer to Note 2)
(15)(15)
Credits issued to IPL’s retail electric customers in 2021 through its transmission cost rider for refunds received in 2020 for the MISO transmission owner return on equity complaints(14)(14)
Changes in income taxes paid/refunded(7)40(29)
Other (primarily due to other changes in working capital)(9)(19)(26)
$41$76($53)
Alliant EnergyIPLWPL
Higher collections from WPL’s retail electric and gas base rate increases$95$—$95
Lower contributions to qualified defined benefit pension plans371718
Natural gas cost payments from extreme temperatures in February 2021 resulting in under-recovered natural gas costs at IPL in 20211515
Credits issued to IPL’s retail electric customers in 2021 through its transmission cost rider for refunds received in 2020 for MISO transmission owner return on equity complaints1414
Timing of WPL’s fuel-related cost recoveries from customers(71)(71)
Changes in levels of gas stored underground and prepaid gas costs(35)(13)(22)
Changes in interest payments(23)(5)(6)
Changes in income taxes paid/refunded(6)5(27)
Other (primarily due to other changes in working capital)(18)38(57)
$8$71($70)

As discussed in “2022 Highlights,” the Inflation Reduction Act of 2022 provides the right to transfer future renewable tax credits to other corporate taxpayers, which is expected to result in future cash flows from operating activities for Alliant Energy, IPL and WPL.

Investing Activities - The following items contributed to increased (decreased) investing activity cash flows for the nine months ended September 30, 20212022 compared to the same period in 20202021 (in millions):
Alliant EnergyIPLWPL
Alliant EnergyIPLWPL
(Higher) lower utility construction and acquisition expenditures (a)(Higher) lower utility construction and acquisition expenditures (a)$163$180($17)(Higher) lower utility construction and acquisition expenditures (a)($101)$16($117)
Changes in the amount of cash receipts on sold receivablesChanges in the amount of cash receipts on sold receivables105105Changes in the amount of cash receipts on sold receivables(65)(65)
Refund from ATC in 2020 for construction deposits WPL previously provided to ATC for transmission network upgrades for West Riverside(42)(42)
OtherOther13914Other191115
$227$324($45)($147)($38)($102)

(a)Largely due to higher expenditures for WPL’s solar generation, partially offset by lower expenditures for IPL’s and WPL’s expansion of wind generation, IPL’s and WPL’s electric and gas distribution systems and WPL’s West Riverside Energy Center, partially offset by higher expenditures for WPL’s solar generation.systems.

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Construction and Acquisition Expenditures - Construction and acquisition expenditures and financing plans are reviewed, approved and updated as part of the strategic planning process. Changes may result from a number of reasons, including regulatory requirements, changing legislation, not obtaining favorable and acceptable regulatory approval on certain projects, improvements in technology, and improvements to ensure reliability of the electric and gas distribution systems. Construction and acquisition expenditures for 20212022 through 20252026 are currently anticipated as follows (in millions), andwhich are focused on the transition to cleaner energy and strengthening the resiliency and reliability of Alliant Energy’s, IPL’s and WPL’s electric grid. Cost estimates represent Alliant Energy’s, IPL’s and WPL’s portion of construction expenditures and exclude AFUDC and capitalized interest, if applicable. Such estimates do not reflect
Alliant EnergyIPLWPL
202220232024202520262022202320242025202620222023202420252026
Generation:
Renewables and battery storage$775 $900 $1,205 $725 $1,060 $40 $325 $625 $260 $670 $735 $575 $580 $465 $390 
Other80 100 315 490 335 40 55 55 70 100 40 45 260 420 235 
Distribution:
Electric systems465 550 595 545 535 250 320 360 300 280 215 230 235 245 255 
Gas systems75 80 85 85 85 35 35 40 40 40 40 45 45 45 45 
Other145 220 210 175 180 25 45 40 45 45 20 35 30 30 30 
$1,540 $1,850 $2,410 $2,020 $2,195 $390 $780 $1,120 $715 $1,135 $1,050 $930 $1,150 $1,205 $955 

New MISO Seasonal Capacity Construct - As discussed in “2022 Highlights,” in August 2022, FERC approved MISO’s proposal to change its methodology for procuring capacity in the assumption that a portionenergy market effective with the 2023/2024 MISO Planning Year. IPL and WPL currently plan to construct and/or acquire additional renewable, battery and natural gas resources to comply with the requirements of this new methodology and have reflected the estimated capital expenditures for these projects in the "Renewables and battery storage" and "Other” Generation lines in the construction is expected to be financed by tax equity partners, as discussed below in “IPLand acquisition table above.

Renewables and Battery Storage - Alliant Energy, IPL and WPL Solar Project Tax Equity Credits.”continue to evaluate potential impacts from cost pressures prevalent in the solar generation and battery storage markets and the pending U.S. Department of Commerce investigation on the timing and estimated costs for IPL’s and WPL’s planned development and acquisition of additional renewable energy, which could impact their anticipated future construction and acquisition expenditures. Refer to "Customer Investments2022 Highlights" for further discussion of certain key projects impacting constructionthe U.S. Department of Commerce investigation and acquisition plansregulatory filings with the IUB and PSCW related to future renewable and battery storage projects, including recent filings by IPL and WPL announcing plans to shift away from tax equity partnerships to traditional ownership for future renewable and battery storage projects following the utility business.enactment of the Inflation Reduction Act of 2022.
Alliant EnergyIPLWPL
202120222023202420252021202220232024202520212022202320242025
Generation:
Renewable projects$385 $550 $520 $1,270 $675 $20 $80 $200 $510 $340 $365 $470 $320 $760 $335 
Other90 105 185 190 90 55 65 150 140 45 35 40 35 50 45 
Distribution:
Electric systems490 445 560 605 625 265 210 300 340 350 225 235 260 265 275 
Gas systems70 70 80 70 75 35 35 40 35 35 35 35 40 35 40 
Other165 185 185 185 205 25 30 30 35 40 20 25 25 35 30 
$1,200 $1,355 $1,530 $2,320 $1,670 $400 $420 $720 $1,060 $810 $680 $805 $680 $1,145 $725 

Financing Activities - The following items contributed to increased (decreased) financing activity cash flows for the nine months ended September 30, 20212022 compared to the same period in 20202021 (in millions):
Alliant EnergyIPLWPLAlliant EnergyIPLWPL
Lower net proceeds from issuance of long-term debt($750)($400)($50)
Lower net proceeds from common stock issuances(219)
Higher net proceeds from issuance of long-term debtHigher net proceeds from issuance of long-term debt$938$—$288
Capital contributions from noncontrolling interestCapital contributions from noncontrolling interest2929
Higher payments to retire long-term debtHigher payments to retire long-term debt(375)
Net changes in the amount of commercial paper outstandingNet changes in the amount of commercial paper outstanding(158)(225)Net changes in the amount of commercial paper outstanding(59)18
Distributions to noncontrolling interestDistributions to noncontrolling interest(29)(29)
(Higher) lower common stock dividends(Higher) lower common stock dividends(23)(124)1(Higher) lower common stock dividends(18)61(7)
Lower payments to retire long-term debt650200150
Higher (lower) capital contributions from IPL’s and WPL’s parent company, Alliant EnergyHigher (lower) capital contributions from IPL’s and WPL’s parent company, Alliant Energy(295)220Higher (lower) capital contributions from IPL’s and WPL’s parent company, Alliant Energy(50)175
OtherOther2465Other(8)4(6)
($476)($613)$101$478$15$468

IPL and WPL Solar Project Tax Equity CreditsFinancing - As discussed in Note 1(c) and “2022 Highlights,” with the August 2022 enactment of the Inflation Reduction Act of 2022, IPL and WPL each proposecurrently expect to own and operateretain full ownership of their planned solar generation projects discussed in “Customer Investments,” which are currently expected to qualify for 26% to 30% investment tax credits, through a tax equity partnership, with approximately 25% to 45%instead of the construction costs financed with capital from the tax equity partner. Assumingfinancing a portion of the construction costs are financed by thewith capital from tax equity partner, IPL would receive approximately $25 million in 2023 and $260 million in 2024 from the tax equity partner, and WPL would receive approximately $190 million in 2022, $100 million in 2023, $320 million in 2024 and $170 million in 2025 from the tax equity partner. IPL and WPL would expect to include their portion of capital expenditures, less the amounts financed by the tax equity partner, in their respective rate base.partners.

Common Stock Issuances and Common Stock Dividends - Refer to Note 5 6 for discussion of common stock issuances by Alliant Energy in 2021.2022. Refer to “Results of Operations” for discussion of expected issuances of common stock and common stock dividends in 2022.2023.

Short- and Long-term Debt - Refer to Note 7(a) for discussion of changes to Alliant Energy's, IPL's and WPL's credit facility capacity amounts in the third quarter of 2021. Refer to Note 7(b) for discussion of AEF’s and WPL’s issuance of long-term debt and Corporate Services’ retirement of long-term debt in 2021.2022. AEF’s current term loan credit agreement that expires in March 2024 includes an option to increase the amount outstanding up to $400 million in aggregate with the same maturity, subject to bank approval, and includes substantially the same financial covenants that are included in Alliant Energy’s credit facility agreement. Refer to “Results of OperationsOperations” for discussion of expected future issuances and retirements of long-term debt by the end of 2022.2023.
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Impact of Credit Ratings on Liquidity and Collateral Obligations -
Ratings Triggers - In June 2022, Standard & Poor’s Ratings Services changed WPL’s outlook from stable to negative. This outlook change is not expected to have a material impact on Alliant Energy and WPL’s liquidity or collateral obligations.

Off-Balance Sheet Arrangements and Certain Financial Commitments - A summary of Alliant Energy’s and IPL’s off-balance sheet arrangements and Alliant Energy’s, IPL’s and WPL’s contractual obligations is included in the 20202021 Form 10-K and has not changed materially from the items reported in the 20202021 Form 10-K, except for the items described in Notes 34, 7 and 143.

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OTHER MATTERS

Critical Accounting Policies and Estimates - The summary of critical accounting policies and estimates included in the 2020 Form 10-K has not changed materially, except as described below.

Long-Lived Assets -
Regulated Operations -
Generating Units Subject to Early Retirement - Refer to Note 1(b) for discussion of the anticipated retirement of Columbia Unit 1 by the end of 2023 and Columbia Unit 2 by the end of 2024, and Alliant Energy’s and WPL’s conclusion that these EGUs met the criteria to be considered probable of abandonment and no disallowance was required as of September 30, 2021.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Quantitative and Qualitative Disclosures About Market Risk are reported in the 20202021 Form 10-K and have not changed materially.

ITEM 4. CONTROLS AND PROCEDURES

Alliant Energy’s, IPL’s and WPL’s management evaluated, with the participation of each of Alliant Energy’s, IPL’s and WPL’s Chief Executive Officer, Chief Financial Officer and Disclosure Committee, the effectiveness of the design and operation of Alliant Energy’s, IPL’s and WPL’s disclosure controls and procedures (as defined in Rule 13a-15(e) of the Securities Exchange Act of 1934)1934, as amended) as of September 30, 20212022 pursuant to the requirements of the Securities Exchange Act of 1934, as amended. Based on their evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that Alliant Energy’s, IPL’s and WPL’s disclosure controls and procedures were effective as of the quarter ended September 30, 2021.2022.

There was no change in Alliant Energy’s, IPL’s and WPL’s internal control over financial reporting that occurred during the quarter ended September 30, 20212022 that has materially affected, or is reasonably likely to materially affect, Alliant Energy’s, IPL’s or WPL’s internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

None. SEC regulations require Alliant Energy, IPL and WPL to disclose information about certain proceedings arising under federal, state or local environmental provisions when a governmental authority is a party to the proceedings and such proceedings involve potential monetary sanctions that Alliant Energy, IPL and WPL reasonably believe will exceed a specified threshold. Pursuant to the SEC regulations, Alliant Energy, IPL and WPL use a threshold of $1 million for purposes of determining whether disclosure of any such proceedings is required. Applying this threshold, there are no environmental matters to disclose for this period.

ITEM 1A. RISK FACTORS

The risk factors described in Item 1A in the 20202021 Form 10-K have not changed materially.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

A summary of Alliant Energy common stock repurchases for the quarter ended September 30, 20212022 was as follows:
Total NumberAverage PriceTotal Number of SharesMaximum Number (or Approximate
of SharesPaid PerPurchased as Part ofDollar Value) of Shares That May
PeriodPurchased (a)SharePublicly Announced PlanYet Be Purchased Under the Plan (a)
July 1 through July 313,753$56.78N/A
August 1 through August 312,52661.64N/A
September 1 through September 307259.59N/A
6,35158.74

Total NumberAverage PriceTotal Number of SharesMaximum Number (or Approximate
of SharesPaid PerPurchased as Part ofDollar Value) of Shares That May
PeriodPurchased (a)SharePublicly Announced PlanYet Be Purchased Under the Plan (a)
July 1 through July 314,429$57.92N/A
August 1 through August 312,66863.83N/A
September 1 through September 306158.18N/A
7,15860.12

(a)All shares were purchased on the open market and held in a rabbi trust under the Alliant Energy Deferred Compensation Plan. There is no limit on the number of shares of Alliant Energy common stock that may be held under the Deferred Compensation Plan, which currently does not have an expiration date.

ITEM 5. OTHER INFORMATION

On November 4, 2022, the Board of Directors of Alliant Energy Corporation (the “Company”) approved an amendment and restatement of the Amended and Restated Bylaws of the Company, effective November 8, 2022. The amendments update Section 3.14 related to notice of shareowner business and nomination of directors by conforming the bylaw provision to
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Table of Contents
universal proxy rules promulgated by the SEC, requiring additional information be provided by shareowners utilizing the bylaw provision, and amending the deadline to submit proposals or nominees under the bylaws to not later than the close of business on the 90th day nor earlier than the close of business on the 120th day prior to the first anniversary of the preceding year’s annual meeting except in certain circumstances. The amendments also include certain technical and clarifying changes to the bylaws.

The foregoing summary is qualified in its entirety by reference to the copy of the Amended and Restated Bylaws of Alliant Energy filed as Exhibit 3.1 to this Quarterly Report on Form 10-Q and is incorporated by reference herein. A blackline of the Amended and Restated Bylaws against the prior version of the bylaws is filed herewith as Exhibit 3.2.

ITEM 6. EXHIBITS

The following Exhibits are filed herewith or incorporated herein by reference.
Exhibit NumberDescription
3.1
3.2
4.1
10.1#
10.2#
31.1
31.2
31.3
31.4
31.5
31.6
32.1
32.2
32.3
101.INSInline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCHInline XBRL Taxonomy Extension Schema Document
101.CALInline XBRL Taxonomy Extension Calculation Linkbase Document
101.LABInline XBRL Taxonomy Extension Label Linkbase Document
101.PREInline XBRL Taxonomy Extension Presentation Linkbase Document
101.DEFInline XBRL Taxonomy Extension Definition Linkbase Document
104Cover Page Interactive Data File (embedded within the Inline XBRL document)

# A management contract or compensatory plan or arrangement.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Alliant Energy Corporation, Interstate Power and Light Company and Wisconsin Power and Light Company have each duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized on the 5th8th day of November 2021.2022.

ALLIANT ENERGY CORPORATION
Registrant
By: /s/ Benjamin M. BilitzChief Accounting Officer and Controller
Benjamin M. Bilitz(Principal Accounting Officer and Authorized Signatory)
INTERSTATE POWER AND LIGHT COMPANY
Registrant
By: /s/ Benjamin M. BilitzChief Accounting Officer and Controller
Benjamin M. Bilitz(Principal Accounting Officer and Authorized Signatory)
WISCONSIN POWER AND LIGHT COMPANY
Registrant
By: /s/ Benjamin M. BilitzChief Accounting Officer and Controller
Benjamin M. Bilitz(Principal Accounting Officer and Authorized Signatory)
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