UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K
(Mark One)
ý
x
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 20132015
OR
¨
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
For the transition period from                     ��           to                     . 
Commission File Number 1-5924
Commission
File Number
Registrant; State of Incorporation;
Address; and Telephone Number
IRS Employer
Identification Number
1-13739
UNS ENERGY CORPORATION
(An Arizona Corporation)
88 East Broadway Boulevard
Tucson, AZ 85701
(520) 571-4000
86-0786732
1-5924
TUCSON ELECTRIC POWER COMPANY
(An Exact name of registrant as specifiedin its charter)
Arizona Corporation)
(State or other jurisdiction of
incorporation or organization)
86-0062700
(I.R.S. Employer Identification No.)
88 East Broadway Boulevard,
Tucson, AZ 85701
(Address of principal executive offices)(Zip Code)
Registrant's telephone number, including area code: (520) 571-4000
86-0062700
Securities registered pursuant to Section 12(b) of the Exchange Act:
RegistrantTitle of Each Class
Name of Each Exchange
on Which Registered
UNS Energy Corporation                     Common Stock, no par value            New York Stock Exchange
None
Securities registered pursuant to Section 12(g) of the Exchange Act:
RegistrantTitle of Each Class
Name of Each Exchange
on Which Registered
Tucson Electric Power Company        Common Stock, without par value
N/A(Title of Class)

Indicate by check mark if the registrant is a well knownwell-known seasoned issuer, as defined in Rule 405 of the Securities Act of 1933.
UNS Energy Corporation
Yes  x
No  ¨
Tucson Electric Power Company         
Yes  ¨
 
No  x




Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 (Exchange Act).
UNS Energy Corporation
Yes  ¨
 
No  x
Tucson Electric Power Company         
Yes  ¨
No  x

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.
UNS Energy Corporation
Yes  x
 
    No  ¨
Tucson Electric Power Company
Yes  x
No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).




UNS Energy Corporation
Yes  x
 
    No  ¨
Tucson Electric Power Company
Yes  x
No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of each registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ýx

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):
UNS Energy CorporationLarge Accelerated Filerx¨Accelerated Filer¨
Non-accelerated Filer¨xSmaller Reporting Company¨
Tucson Electric Power CompanyLarge Accelerated Filer¨Accelerated Filer¨
Non-accelerated FilerxSmaller Reporting Company¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
UNS Energy Corporation
Yes  ¨
 
 No  x
Tucson Electric Power Company
Yes  ¨
    No  x
The
State the aggregate market value of UNS Energy Corporationthe voting Common Stockand non-voting common equity held by non-affiliates of the registrant was $1,855,552,035 based on the last reported sale price thereof on the consolidated tape on June 30, 2013.non-affiliates: None

As of February 14, 2014, 41,633,535 shares of UNS Energy Corporation Common Stock, no par value (the only class of Common Stock), were outstanding. As of February 14, 2014,17, 2016, Tucson Electric Power Company had 32,139,434 shares of common stock, outstanding, no par value, outstanding, all of which were held by UNS Energy Corporation.Corporation, an indirect wholly owned subsidiary of Fortis Inc.

Tucson Electric Power Company meets the conditions set forth in General Instructions (I)(1)(a) and (b) on Form 10-K and is therefore filing this report with the reduced disclosure format.
Documents incorporated by reference: Specified portions of UNS Energy Corporation’s Proxy Statement relating to the 2014 Annual Meeting of Shareholders are incorporated by reference into Part III.None



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Table of Contents
PART I
 
  
PART II 
  

iii



  
PART III 

iii




  
  
PART IV 
  



iv





DEFINITIONS
The abbreviations and acronyms used in the 20132015 Form 10-K are defined below:
2010 Credit Agreement The 2010 Credit Agreement consisted of a $200 million revolving credit and letter of credit facility together with an $82 million LOC facility to support tax-exempt bonds; terminated in October 2015 when replaced by the 2015 Credit Agreement
2010 Reimbursement AgreementReimbursement Agreement, dated December 14, 2010, between TEP, as borrower, and a financial institution
2013 Covenants AgreementA Lender Rate Mode Covenants Agreement between TEP and the purchaser of $100 million of unsecured tax-exempt bonds that were issued on behalf of TEP in November 2013 and sold in a private placement
2013 TEP Rate OrderA rate order issued by the ACC resulting in a new rate structure for TEP, effective July 1, 2013
2014 Credit AgreementThe 2014 Credit Agreement consisted of a $130 million term loan commitment and a $70 million revolving credit commitment; terminated in June 2015
2015 Credit AgreementThe 2015 Credit Agreement provides for a $250 million revolving credit and letter of credit facility with a sublimit of $50 million; the credit agreement matures in 2020 and replaced the 2010 Credit Agreement
2015 TEP Rate CaseA pending general rate case filed with the ACC by TEP in November 2015 requesting new rates effective January 1, 2017
ACC Arizona Corporation Commission
APS Arizona Public Service Company
BART Best Available Retrofit Technology
Base O&MA non-GAAP financial measure that represents the fundamental level of operating and maintenance expense related to our business
Base Rates The portion of TEP’s and UNS Electric’s Retail Rates attributed to generation, transmission, distribution, costs, and customer charge; and UNS Gas’ delivery costs and customer charge.costs. Base Rates exclude authorized charges designed to recover specific costs that are passed through to customers forincluding fuel and purchased power costs, energy efficiency program costs, certain environmental compliance costs, and a portion of renewable energy costs
BtuBritish thermal unit(s)
Cooling Degree Days An index used to measure the impact of weather on energy usage calculated by subtracting 75 from the average of the high and low daily temperatures
DSM Demand Side Management
ECAEE Standards Environmental Compliance Adjustor
Entegraa subsidiary of Entegra Power Group LLCEnergy Efficiency Standards
FERC Federal Energy Regulatory Commission
FVRBFair Value Rate Base
FortisFortisUS, Inc., a Delaware corporation whose ultimate parent company is Fortis Parent
Fortis Parent Fortis Inc., a corporation incorporated under the Corporations Act of Newfoundland and Labrador, Canada, whose principal executive offices are located at Fortis Place, Suite 1100, 5 Springdale Street, St. John's, NL A1E 0E4
Four Corners Four Corners Generating Station
GAAPGenerally Accepted Accounting Principles in the United States
GBtu Billion British thermal units
GWh Gigawatt-hour(s)
Gila River Unit 3 Unit 3 of the Gila River Generating Station
Heating Degree Days An index used to measure the impact of weather on energy usage calculated by subtracting the average of the high and low daily temperatures from 65
kV Kilo-voltKilo-volt(s)
kWh Kilowatt-hour(s)
LFCR Lost Fixed Cost Recovery Mechanism
MillenniumLOC Millennium Energy Holdings, Inc., a wholly-owned subsidiaryLetter of UNS Energy Corporation
MMBtuMillion British thermal unitsCredit
MW Megawatt(s)
MWh Megawatt-hour(s)
Navajo Navajo Generating Station
NTUANavajo Tribal Utility Authority
OATTOpen Access Transmission Tariff
OCRBOriginal Cost Rate Base
PGAPurchased Gas Adjustor, a Retail Rate mechanism designed to recover the cost of gas purchased for retail gas customers
PNM Public Service Company of New Mexico
PPA Power Purchase Agreement
PPFAC Purchased Power and Fuel Adjustment Clause
RECppb Renewable Energy Credit
RESRenewable Energy Standard
Regional Haze RulesRules promulgated by the EPA to improve visibility at national parks and wilderness areasParts per billion

v




RECRenewable Energy Credit
RESRenewable Energy Standard
Retail Rates Rates designed to allow a regulated utility an opportunity to recover its reasonable operating and capital costs and earn a return on its utility plant in service
San Juan San Juan Generating Station
SCR Selective Catalytic Reduction
SJCC San Juan Coal Company
SNCR Selective Non-Catalytic Reduction
Springerville Springerville Generating Station
Springerville Coal Handling FacilitiesCoal handling facilities at Springerville used by all four Springerville units
Springerville Coal Handling Facilities Leases CoalLeases for coal handling facilities at Springerville used in common by all four Springerville units
Springerville Common Facilities Facilities at Springerville used in common by all four Springerville unitsUnits 1 and 2
Springerville Common Facilities Leases Leveraged lease arrangements relating to an undivided one-half interest in certain Springerville Common Facilities
Springerville Unit 1 Unit 1 of the Springerville Generating Station
Springerville Unit 1 Leases 
Leveraged lease arrangement relating to Springerville Unit 1 and an
undivided one-half interest in certain Springerville Common Facilities
Springerville Unit 2 Unit 2 of the Springerville Generating Station
Springerville Unit 3 Unit 3 of the Springerville Generating Station
Springerville Unit 4 Unit 4 of the Springerville Generating Station
SRP Salt River Project Agricultural Improvement and Power District
Sundt H. Wilson Sundt Generating Station
Sundt Unit 4 Unit 4 of the H. Wilson Sundt Generating Station
TCATransmission Cost Adjustor
TEP Tucson Electric Power Company, the principal subsidiary of UNS Energy Corporation
ThermThird-Party Owners A unitWilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of heating value equivalent to 100,000 Btusthe remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners)
Tri-State Tri-State Generation and Transmission Association, Inc.
UEDUniSource Energy Development Company, a wholly-owned subsidiary of UNS Energy Corporation
UESUniSource Energy Services, Inc., a wholly-owned subsidiary of UNS Energy, and intermediate holding company established to own the operating companies UNS Electric and UNS Gas
UNS Electric UNS Electric, Inc., aan indirect wholly-owned subsidiary of UESUNS Energy
UNS Energy UNS Energy Corporation, (formerly known as UniSource Energy Corporation)the parent company of TEP, whose principal executive offices are located at 88 East Broadway Boulevard, Tucson, Arizona 85701
UNS Gas UNS Gas, Inc., aan indirect wholly-owned subsidiary of UESUNS Energy
 


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Table of Contents

PART IFORWARD-LOOKING INFORMATION
This combined Form 10-K is being filed separately by UNS Energy Corporation (UNS Energy) and Tucson Electric Power Company (TEP) (collectively, the Registrants). Information contained herein relating to any individual registrant is filed by such registrant on its own behalf. TEP does not make any representation as to information relating to any other subsidiary of UNS Energy.
This Annual Report on Form 10-K contains forward-looking statements as defined by the Private Securities Litigation Reform Act of 1995. You should readTucson Electric Power Company (TEP) is including the following cautionary statements to make applicable and take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 for any forward-looking statements together with the cautionary statements and important factors included elsewheremade by or for TEP in this Annual Report on Form 10-K (See Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations, Safe Harbor for Forward-Looking Statements).10-K. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance and underlying assumptions. Forward-lookingassumptions, and other statements that are not statements of historical facts. Forward-looking statements may be identified by the use of words such as “anticipates,” “estimates,” “expects,” “intends,” “plans,” “predicts,” “projects,”anticipates, believes, estimates, expects, intends, may, plans, predicts, projects, would, and similar expressions. From time to time, we may publish or otherwise make available forward-looking statements of this nature. All such forward-looking statements, whether written or oral, and whether made by or on behalf of TEP, are expressly qualified by these cautionary statements and any other cautionary statements which may accompany the forward-looking statements. In addition, TEP disclaims any obligation to update any forward-looking statements to reflect events or circumstances after the date of this report, except as may otherwise be required by the federal securities laws.
Forward-looking statements involve risks and uncertainties, which could cause actual results or outcomes to differ materially from those expressed therein. We express our expectations, beliefs, and projections in good faith and believe them to have a reasonable basis. However, we make no assurances that management’s expectations, beliefs or projections will be achieved or accomplished. InWe have identified the following important factors that could cause actual results to differ materially from those discussed in our forward-looking statements. These may be in addition UNS Energyto other factors and TEP disclaim any obligation to update any forward-looking statements to reflect events or circumstances after the datematters discussed in: Part I, Item 1A. Risk Factors; Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations; and other parts of this report.

ITEM 1. – BUSINESS
OVERVIEW OF CONSOLIDATED BUSINESS
UNS Energy is a utility services holding company engaged, through its subsidiaries, These factors include: state and federal regulatory and legislative decisions and actions; changes in, the electric generation and energy delivery business. Each of UNS Energy’s subsidiaries is a separate legal entity with its own assets and liabilities. UNS Energy owns 100% of TEP, UniSource Energy Services, Inc. (UES), Millennium Energy Holdings, Inc. (Millennium), and UniSource Energy Development Company (UED).
TEP is a regulated utility and UNS Energy’s largest operating subsidiary, representing approximately 83% of UNS Energy’s total assets at December 31, 2013. TEP generates, transmits and distributes electricity to approximately 413,000 retail electric customers in a 1,155 square mile area in southeastern Arizona. TEP also sells electricity to other utilities and power marketing entities, located primarily in the western United States. In addition, TEP operates Springerville Generating Station (Springerville) Unit 3 on behalf of Tri-State Generation and Transmission Association, Inc. (Tri-State) and Springerville Unit 4 on behalf of Salt River Project Agriculture Improvement and Power District (SRP).
UES holds the common stock of two regulated utilities, UNS Electric, Inc. (UNS Electric) and UNS Gas, Inc. (UNS Gas). UNS Electric is a regulated utility, which generates, transmits and distributes electricity to approximately 93,000 retail customers in Mohave and Santa Cruz counties in Arizona. UNS Gas is a regulated gas distribution company, which services approximately 150,000 retail customers in Mohave, Yavapai, Coconino, Navajo, and Santa Cruz counties in Arizona.
UED and Millennium’s investments in unregulated businesses represent less than 1% of UNS Energy’s assets as of December 31, 2013.
References in this report to “we” and “our” are to UNS Energy and its subsidiaries, collectively.
AGREEMENT AND PLAN OF MERGER
In December 2013, UNS Energy entered into an Agreement and Plan of Merger (the Merger Agreement) with FortisUS Inc., a Delaware corporation (Fortis), Color Acquisition Sub Inc., an Arizona corporation and a wholly owned subsidiary of Fortis (Merger Sub), and, solely for the purposes of Sections 5.5(c) and 8.15 of the Merger Agreement, Fortis Inc., a corporation incorporated under the Corporations Act of Newfoundland and Labrador and the parent company of Fortis (Fortis Parent).
The Merger Agreement provides for a business combination whereby Merger Sub will merge with and into UNS Energy (the Merger). As a result of the Merger, the separate corporate existence of Merger Sub will cease and UNS Energy will continue as a wholly owned subsidiary of Fortis. The Boards of Directors of each of UNS Energy and Fortis Parent have approved the Merger.
Under the Merger Agreement, at the effective time of the Merger, each outstanding share of UNS Energy common stock (other than shares owned by UNS Energy, Fortis Parent, Fortis or Merger Sub or their subsidiaries) will be converted into the right to receive $60.25 in cash (the Merger Consideration). At the effective time and as a result of the Merger, each outstanding option to acquire UNS Energy common stock issued by UNS Energy will be converted into the right to receive the difference between

K-1


the Merger Consideration and the exercise price of the option, on a per-share basis, and each outstanding share of restricted stock, restricted stock unit, performance share and other equity-based awards will vest and be converted into the right to receive the Merger Consideration.
The Merger is subject to the approval of stockholders holding a majority of the outstanding shares of UNS Energy and other customary closing conditions, including, among other things:
the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended;
approvals of the Arizona Corporation Commission (ACC) and the Federal Energy Regulatory Commission (FERC);
confirmation of review, without unresolved concerns, from the Committee on Foreign Investment in the United States; and
the absence of any injunction, order or other law prohibiting the Merger.
The obligations of each party to close the Merger are also subject to the accuracy of representations and warranties of, and compliance with, covenantsenvironmental laws, regulations, decisions and policies that could increase operating and capital costs, reduce generating facility output or accelerate generating facility retirements; regional economic and market conditions which could affect customer growth and energy usage; changes in energy consumption by retail customers; weather variations affecting energy usage; the other parties as set forth incost of debt and equity capital and access to capital markets; the Merger Agreement, and, in the case of Fortis, the absence of any material adverse effect on UNS Energy.
The Merger Agreement provides that Fortis and UNS Energy may mutually agree to terminate the Merger Agreement before completing the Merger. In addition, either Fortis or UNS Energy may decide to terminate the Merger Agreement if, among other things:
the Merger is not consummated by December 11, 2014, subject to extension to June 11, 2015 if regulatory approvals have not been obtained (or further if approvals have been obtained but have not yet become final orders), but other closing conditions have been satisfied or waived;
UNS Energy stockholders fail to adopt the Merger Agreement;
a court or other governmental entity issues a final and nonappealable order prohibiting the Merger; or
the other party breaches the Merger Agreement in a way that would entitle the party seeking to terminate the Merger Agreement not to consummate the Merger, subject to the rightperformance of the breaching partystock market and changing interest rate environment, which affect the value of our pension and other retiree benefit plan assets and the related contribution requirements and expense; the inability to curemake additions to our existing high voltage transmission system; unexpected increases in O&M expense; resolution of pending litigation matters; changes in accounting standards; changes in critical accounting estimates; the breach.
UNS Energy may also terminateongoing impact of mandated energy efficiency and distributed generation initiatives; changes to long-term contracts; the Merger Agreement prior to receiving stockholder approval, after complying with certain procedures set forth incost of fuel and power supplies; the Merger Agreement, in order to accept a superior takeover proposal upon payment of a termination fee of approximately $64 million (Termination Fee). Fortis may terminate the Merger Agreement and require payment of the Termination Fee if UNS Energy enters into an agreement with respect to a superior takeover proposal, or if the Board of Directors of UNS Energy recommends or proposes to approve or recommend any alternative takeover proposal with a third party, or withdraws, modifies or proposes publicly to withdraw or modify its approval or recommendation with respect to the Merger Agreement. The Merger Agreement further provides that, upon termination under certain other circumstances, UNS Energy may be obligated to reimburse up to $12.5 million of Fortis’ expenses with respect to the transaction and, if another takeover proposal is agreed or consummated, pay Fortis the Termination Fee (net of any expense reimbursement previously paid).
Fortis has agreed to maintain UNS Energy’s community involvement efforts and charitable donations for five years following the closing and to keep UNS Energy’s headquarters in Tucson, Arizona. Fortis has also agreed to retain four of UNS Energy’s current directors on the board of UNS Energy following the closing.
UNS Energy and Fortis have agreed to customary representations, warranties and covenants in the Merger Agreement, including, among others, covenants (i) with respect to the conduct of its business during the interim period between the execution of the Merger Agreement and consummation of the Merger, (ii) not to solicit proposals regarding alternative business combination transactions and (iii) not to engage in certain kinds of transactions during such period. UNS Energy and Fortis have agreed to use their reasonable best effortsability to obtain required governmental approvalscoal from our suppliers; cyber attacks or challenges to effectour information security; and the transaction.performance of TEP's generating plants.
On February 18, 2014, we filed definitive proxy materials with the SEC. We expect UNS Energy's shareholders to formally consider a proposal to approve the Merger Agreement at a meeting on March 26, 2014.
In January 2014, UNS Energy and Fortis Parent filed an application and supporting testimony with the ACC requesting approval of the Merger. The ACC administrative law judge (ALJ) assigned to this matter issued a procedural order that provides for settlement discussions to commence on April 28, 2014, and a hearing before the ALJ to commence on June 16, 2014. In February 2014, we filed an application with FERC requesting approval of the Merger. The Merger is expected to close by the end of 2014.

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Table of Contents

BUSINESS SEGMENT CONTRIBUTIONS
The table below shows the contributions to our consolidated after-tax earnings by our three business segments.
 2013 2012 2011
 Millions of Dollars
TEP$101
 $65
 $85
UNS Electric12
 17
 18
UNS Gas11
 9
 10
Other Non-Reportable Segments and Adjustments(1)
3
 
 (3)
Consolidated Net Income$127
 $91
 $110
(1)
Includes: UNS Energy parent company expenses, Millennium, UED, and intercompany eliminations.
See Note 4 for additional financial information regarding our business segments.
Rates and Regulation of TEP, UNS Electric, and UNS Gas
The ACC regulates portions of TEP's, UNS Electric's, and UNS Gas' utility accounting practices and energy rates. The ACC has authority over rates charged to retail customers, the issuance of securities, and transactions with affiliated parties. Our regulated utility rates for retail electric and natural gas service are determined on a “cost of service” basis. Retail Rates are designed to provide, after recovery of allowable operating expenses, an opportunity for our utility businesses to earn a reasonable return on rate base. Rate base is generally determined by reference to the original cost (net of depreciation) of utility plant in service to the extent deemed used and useful, and to various adjustments for deferred taxes and other items, plus a working capital component. Over time, additions to utility plant in service increase rate base while depreciation of utility plant reduces rate base.
The rates charged to retail customers also include pass-through mechanisms that allow each utility to recover the prudently incurred actual costs of its fuel, transmission, and energy purchases.
The FERC regulates the terms and prices of transmission services and wholesale electricity sales, wholesale transport and purchases of natural gas, and portions of our accounting practices. TEP and UNS Electric have FERC tariffs to sell power at market-based rates.PART I

TEPITEM 1. BUSINESS

GENERAL
Tucson Electric Power Company (TEP) and its predecessor companies have served the greater Tucson metropolitan area for over 100 years. TEP was incorporated in the State of Arizona in 1963. TEP is the principal operating subsidiary of UNS Energy. In 2013, TEP’sa regulated electric utility operations contributed 81% of UNS Energy’s operating revenues and comprised 83% of its assets at year end.
SERVICE AREA AND CUSTOMERS
TEP is a vertically integrated utility that provides regulated electric service tocompany serving approximately 413,000417,000 retail customers in southeastern Arizona.customers. TEP’s service territory covers 1,155 square miles and includes a population of approximately one million people in the greater Tucson metropolitan area in Pima County, as well as parts of Cochise County. TEP's principal business operations include generating, transmitting, and distributing electricity to its retail customers. In addition to retail sales, TEP also sells electricity, transmission, and ancillary services to other entitiesutilities, municipalities, and energy marketing companies on a wholesale basis. TEP is subject to comprehensive state and federal regulation. The regulated electric utility operation is TEP's only segment.
TEP is a wholly owned subsidiary of UNS Energy Corporation (UNS Energy), a utility services holding company. In August 2014, UNS Energy was acquired by Fortis Inc. (Fortis) and became an indirect wholly owned subsidiary of Fortis, which is a leader in the westernNorth American electric and gas utility business.
REGULATED UTILITY OPERATIONS
TEP delivers electricity to retail customers in southern Arizona. TEP owns or has contracts for coal, natural gas, wind, solar, and landfill gas generation resources to provide electricity. This electricity, together with electricity purchased on the wholesale market, is delivered over transmission lines which are part of the Western Interconnection, a regional grid in the United States. The electricity is then transformed to lower voltages and delivered to customers through TEP's distribution system.
TEP operates under a certificate of public convenience and necessity as regulated by the Arizona Corporation Commission (ACC), under which TEP is obligated to provide electricity service to customers within its service territory. The ACC establishes retail rates on a cost-of-service basis, which are designed to allow TEP to recover its costs of providing services and an opportunity to earn a reasonable return on its investment.

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CUSTOMERS
Electricity sold to retail and wholesale customers by class of customer and the average number of retail customers over the last three years were as follows:
 2015 2014 2013
Electric Sales - GWh           
Residential3,724 28% 3,727 29% 3,867 30%
Commercial2,124 15% 2,170 17% 2,187 17%
Industrial (Non-mining)2,063 15% 2,098 16% 2,114 17%
Mining1,109 8% 1,137 9% 1,079 9%
Other33 % 33 % 32 %
Total Electric Retail Sales9,053 66% 9,165 71% 9,279 73%
Electric Wholesale Sales - Long-Term750 5% 618 5% 605 5%
Electric Wholesale Sales - Short-Term3,928 29% 3,082 24% 2,859 22%
Total Electric Sales13,731 100% 12,865 100% 12,743 100%
            
Average Number of Retail Customers:           
Residential376,439 90% 374,204 90% 370,925 90%
Commercial38,253 9% 38,079 9% 37,783 9%
Industrial (Non-mining)588 % 604 % 622 %
Mining4 % 4 % 4 %
Other1,857 1% 1,858 1% 1,843 1%
Total Retail Customers417,141 100% 414,749 100% 411,177 100%
Retail Customers
TEP provides electric utility service to a diverse group of residential, commercial, industrial, and public sector customers. Major industries served include copper mining, cement manufacturing, defense, health care, education, military bases, and other governmental entities. TEP’s retail sales are influenced by several factors, including economic conditions, seasonal weather patterns, demand side managementDemand Side Management (DSM) initiatives and the increasing use of energy efficient products, and opportunities for customers to generate their own electricity.

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Table of Contents

Customer Base
The table below shows the percentage distribution of TEP’s energy sales by major customer class over the last three years. In 2014, the retail energy consumption by customer class is expected to be similar to the historical distribution.
 2013 2012 2011
Residential42% 41% 42%
Commercial23% 24% 23%
Non-mining Industrial23% 23% 23%
Mining12% 12% 12%
owned distributed generation.
Local, regional, and national economic factors can impact the growth in the number of customers in TEP’s service territory. In 2013, 2012, and 2011,each of the past five years, TEP’s average number of retail customers increased by less than 1% in each year.
We expect. TEP expects the number of TEP’s retail customers to increase at a rate of approximately 1% in 20142016 based on estimated population growth in its service territory.
TEP’s retail sales volume in 2015 was approximately 9,053 gigawatt-hours (GWh), which is a decrease of 3% from 2011 levels. During the past five years, local economic conditions combined with state requirements to reduce retail sales through energy efficiency and 2015.distributed generation have resulted in lower sales volumes and lower use per customer.
Two of TEP’s largest retail customers are in the copper mining industry. TEP’s kilowatt-hour (kWh)GWh sales to mining customers depend on a variety of factors including the market price of copper,commodity prices, the electricity rate paid by mining customers, and the mines’ potential development of their own electric generation resources. TEP’s kWhGWh sales to mining customers decreased by 1.2%2% in 20132015 as a result of mining curtailments due in part to a higher occurrence of planneddeclining commodity prices. In 2016, TEP expects additional curtailments to certain mining customers based on announced plans and unplanned maintenance atcurrent commodity prices. TEP cannot predict how long the mines that reducedcommodity prices will remain low or the mines' demand for electricity.impact prices will have on mining production.
See Part II, Item. 7 - Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Tucson Electric Power, Factors Affecting Results of Operations Sales to Mining Customers.for additional information regarding mining customers.

Retail Sales Volumes
2

During the past three years, economic conditions and state requirements for energy efficiency and distributed generation have negatively affected retail electricity sales. TEP’s retail sales volumes in 2013 were approximately 9,279 Gigawatt-hours (GWh). These volumes were 0.1% below 2010 levels.


Wholesale Sales
TEP’s electric utility operations include the wholesale marketing of electricity to other utilities and power marketers. Wholesale sales transactions are made on both a firm and interruptible basis. A firm contract requires TEP to supply power on demand (except under limited emergency circumstances), while an interruptible contract allows TEP to stop supplying power under defined conditions. See Generating and Other Resources, Purchases and Interconnections, below.
Generally, TEP commits to future sales based on expected excess generating capability, forward prices, and generation costs, using a diversified portfolio approach to provide a balance between long-term, mid-term, and spot energy sales. TEP’s wholesale sales consist primarily of two types of sales:types:
Long-Term Wholesale Sales
Long-term wholesale sales contracts cover periods of more than one year.year or greater. TEP typically uses its own generation to serve the requirements of its long-term wholesale customers. In 2015, TEP’s two primary long-term contracts arewere with Salt River Project Agriculture Improvement and Power District (SRP) and, Shell Energy North America (Shell), the Navajo Tribal Utility Authority (NTUA), and TRICO Electric Cooperative (TRICO). See Item 7. – Management’s DiscussionThe SRP contract expires in May 2016, the Shell contract expires in December 2017, the NTUA contract expires in December 2022, and Analysisthe TRICO contract expires in December 2024.
In November 2015, TEP entered into a long-term wholesale sales contract with Navopache Electric Cooperative (Navopache). Delivery of Financial Conditionpower begins January 1, 2017 and Results of Operations, Tucson Electric Power Company, Factors Affecting Results of Operations, Long-Termexpires in December 2041.
Short-Term Wholesale Sales.
Short-Term Sales
Forward contracts commit TEP to sell a specified amount of capacity or energy at a specified price over a given period of time, typically for one-month three-month, or one-yearthree-month periods. TEP also engages in short-term sales by selling energy in the daily or hourly markets at fluctuating spot market prices and making other non-firm energy sales. AllThe majority of our revenues from short-term wholesale sales offset fuel and purchased power costs and are passed through to TEP’s retail customers. TEP uses short-term wholesale sales as part of its hedging strategy to reduce customer exposure to fluctuating power prices. See Rates
Competition
Retail Customers
TEP is the primary electric service provider to retail customers within its service territory and Regulation, below.operates under a certificate of public convenience and necessity as regulated by the ACC. TEP is subject to competition from customer-sited distributed generation, energy efficiency, and other emerging technologies. TEP is experiencing increases in the levels of customer-sited solar arrays and the use of net energy metering, which allows self-generating retail customers to use their excess generation to offset a portion of their future electricity consumption at the full retail rate.

Wholesale Sales

The Federal Energy Regulatory Commission (FERC) regulates rates for wholesale power sales and transmission services. TEP's wholesale activity primarily consists of Short-Term Wholesale Sales to manage fuel and purchased power supplies to serve retail customer energy requirements and Long-Term Wholesale Sales to optimize generation capacity. As a result of its wholesale activity, TEP competes with other utilities, power marketers and independent power producers in the wholesale markets.

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GENERATING AND OTHER RESOURCESFACILITIES
AtAs of December 31, 2013,2015 TEP owned or leased 2,240 MW2,501 megawatts (MW) of nominal generating capacity, as set forth in the following table:table. Nominal capacity is based on unit design net output.
 Unit   Date Resource Capacity Operating TEP’s Share
Generating SourceNo. Location In Service Type MW Agent % MW
Springerville Station(1)
1 Springerville, AZ 1985 Coal 387
 TEP 100.0
 387
Springerville Station2 Springerville, AZ 1990 Coal 390
 TEP 100.0
 390
San Juan Station1 Farmington, NM 1976 Coal 340
 PNM 50.0
 170
San Juan Station2 Farmington, NM 1973 Coal 340
 PNM 50.0
 170
Navajo Station1 Page, AZ 1974 Coal 750
 SRP 7.5
 56
Navajo Station2 Page, AZ 1975 Coal 750
 SRP 7.5
 56
Navajo Station3 Page, AZ 1976 Coal 750
 SRP 7.5
 56
Four Corners Station4 Farmington, NM 1969 Coal 784
 APS 7.0
 55
Four Corners Station5 Farmington, NM 1970 Coal 784
 APS 7.0
 55
Luna Generating Station1 Deming, NM 2006 Gas 555
 PNM 33.3
 185
Sundt Station1 Tucson, AZ 1958 Gas/Oil 81
 TEP 100.0
 81
Sundt Station2 Tucson, AZ 1960 Gas/Oil 81
 TEP 100.0
 81
Sundt Station3 Tucson, AZ 1962 Gas/Oil 104
 TEP 100.0
 104
Sundt Station4 Tucson, AZ 1967 Coal/Gas 156
 TEP 100.0
 156
Sundt Internal Combustion Turbines  Tucson, AZ 1972-1973 Gas/Oil 50
 TEP 100.0
 50
DeMoss Petrie  Tucson, AZ 1972 Gas/Oil 75
 TEP 100.0
 75
North Loop  Tucson, AZ 2001 Gas 95
 TEP 100.0
 95
Springerville Solar Station  Springerville, AZ 2002-2010 Solar 6
 TEP 100.0
 6
Tucson Solar Projects  Tucson, AZ 2010-2012 Solar 12
 TEP 100.0
 12
Total TEP Capacity (2)
              2,240
  Unit   Date Resource Capacity Operating TEP’s Share
Generating Source No. Location In Service Type MW Agent % 
MW (1)
Springerville Station 1 Springerville, AZ 1985 Coal 387
 TEP 49.5
 192
Springerville Station 2 Springerville, AZ 1990 Coal 406
 TEP 100
 406
San Juan Station 1 Farmington, NM 1976 Coal 340
 PNM 50.0
 170
San Juan Station 2 Farmington, NM 1973 Coal 340
 PNM 50.0
 170
Navajo Station 1 Page, AZ 1974 Coal 750
 SRP 7.5
 56
Navajo Station 2 Page, AZ 1975 Coal 750
 SRP 7.5
 56
Navajo Station 3 Page, AZ 1976 Coal 750
 SRP 7.5
 56
Four Corners Station 4 Farmington, NM 1969 Coal 785
 APS 7.0
 55
Four Corners Station 5 Farmington, NM 1970 Coal 785
 APS 7.0
 55
Gila River Power Station 3 Gila Bend, AZ 2003 Gas 550
 Ethos Energy 75.0
 413
Luna Generating Station 1 Deming, NM 2006 Gas 555
 PNM 33.3
 185
Sundt Station 1 Tucson, AZ 1958 Gas/Oil 81
 TEP 100
 81
Sundt Station 2 Tucson, AZ 1960 Gas/Oil 81
 TEP 100
 81
Sundt Station 3 Tucson, AZ 1962 Gas/Oil 104
 TEP 100
 104
Sundt Station (2)
 4 Tucson, AZ 1967 Gas 156
 TEP 100
 156
Sundt Internal Combustion Turbines   Tucson, AZ 1972-1973 Gas/Oil 50
 TEP 100
 50
DeMoss Petrie   Tucson, AZ 2001 Gas 75
 TEP 100
 75
North Loop   Tucson, AZ 2001 Gas 94
 TEP 100
 94
Springerville Solar Station   Springerville, AZ 2002-2014 Solar 16
 TEP 100
 16
Tucson Solar Projects   Tucson, AZ 2010-2014 Solar 13
 TEP 100
 13
Ft. Huachuca Project   Ft. Huachuca, AZ 2014 Solar 17
 TEP 100
 17
Total TEP Capacity (3)
               2,501
(1) 
Leased asset as of December 31, 2013.Capacity measured in direct current (DC).
(2) 
Sundt Station Unit 4 is a multi-fuel generating facility that can be operated on either coal or natural gas as a primary fuel source. In August 2015, TEP exhausted its existing coal supply at Sundt Station Unit 4 and plans to continue operating Sundt Station Unit 4 with natural gas as a primary fuel source. The table above reflects the nominal generating capacity assuming the unit is fueled by natural gas. Refer to Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Environmental Matters of this Form 10-K for additional information related to environmental matters impacting Unit 4 of the H. Wilson Sundt Generating Station (Sundt).
(3)
Excludes 683913 MW of additional resources, which consist of certain capacity purchases and interruptible retail load. At December 31, 2013, total owned capacity was 1,853 MW and leased capacity was 387 MW.
Springerville Generating Station
TEP leaseshas a 49.5% ownership interest in Unit 1 of the Springerville Generating Station and an undivided one-half interest in certain Springerville Common Facilities (collectively Springerville(Springerville Unit 1) under seven separate lease agreements (Springerville Unit 1 Leases) that are accounted for as capital leases. The leases expire in January 2015 and include fair market value renewal and purchase options. TEP owns a 14.1% undivided ownership interestoperates the remaining interests in Springerville Unit 1 representing approximately 55 megawatts (MW)on behalf of capacity.third parties, Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). The Owner Trustees and Co-Trustees are responsible for their share of operating and capital costs for the facility. See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding the Third-Party Owners.
Unit 2 of the Springerville Generating Station (Springerville Unit 2) is owned by San Carlos Resources, Inc. (San Carlos), a wholly-owned subsidiary of TEP. TEP’s

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TEP's other interests in the Springerville Generating Station (Springerville) include leasehold interestsinclude: (i) 49.5% undivided interest in certain common facilities used by Springerville Unit 1; and (ii) an 83% ownership interest in the Springerville Coal Handling Facilities and in a one-half interest in certain other facilities at Springerville used in common by all four Springerville units (Springerville Common Facilities).Facilities.
Springerville Unit 1 Leases
TEP leases Unit 1 of the Springerville Generating Station and an undivided one-half interest in certain Springerville Common Facilities (collectively Springerville Unit 1) under seven separate lease agreements (Springerville Unit 1 Leases) that are accounted for as capital leases. The leases expire in January 2015 and include fair market value renewal and purchase options. In 2006, TEP purchased a 14.1% undivided ownership interest in Springerville Unit 1, representing approximately 55 MW of capacity.

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During 2013, TEP agreed to purchase leased interests of 35.4% or 137 MW of Springerville Unit 1, for an aggregate purchase price of approximately $65 million. TEP expects to complete the purchases in December 2014 and in January 2015. See Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations, Tucson Electric Power Company, Factors Affecting Results of Operations, Springerville Unit 1.
Springerville Common Facilities Leases
The leveraged lease arrangements relating to ana 50% undivided one-half interest in certain Springerville Common Facilities (Springerville Common Facilities Leases), used by Springerville Unit 2, which expire in 2017 and 2021, have fair market value renewal options as well as a fixed-price purchase provision.options. The fixed prices to acquire the leased interests in the Springerville Common Facilities are $38 million in 2017 and $68 million in 2021.
Springerville Coal Handling Facilities Lease
In 1984, TEP sold and leased back the Springerville Coal Handling Facilities. Since entering the lease, TEP purchased a 13% ownership interest in the Springerville Coal Handling Facilities. The terms of the Springerville Coal Handling Facilities Leases expire in April 2015 but have fixed-rate renewal options if certain conditions are satisfied as well as a fixed-price purchase provision of $120 million.
See Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Tucson Electric Power Company, Liquidity and Capital Resources Contractual Obligations.for additional information regarding the capital leases.
Springerville Units 3 and 4
Springerville Units 3 and 4 are each approximately 400 MW coal-fired generating facilities that are operated, but not owned by TEP. These facilities are located at the same site as Springerville Units 1 and 2. The lessee of Springerville Unit 3 and the owner of Springerville Unit 4 compensate TEP for operating the facilities and pay an allocated portion of the fixed costs related to the Springerville common facilities and Coal Handling Facilities.
Sundt Generating Station
The H. Wilson Sundt Generating Station (Sundt) and the internal combustion turbines located in Tucson are designated as “must-run generation”must-run generation facilities. Must-run generation units are required to run in certain circumstances to maintain distribution system reliability and to meet local load requirements.
Future Generating Resources
Gila River Generating Station Unit 3
In December 2013, TEP and UNS Electric entered into an agreement (the Purchase Agreement) with a subsidiary of Entegra Power Group LLC (Entegra) to purchase Unit 3 of the Gila River Generating Station (Gila River Unit 3). The purchase price of $219 million is subject to adjustments to prorate certain fees and expenses through the closing and in respect of certain operational matters. Gila River Unit 3 is a gas-fired combined cycle unit with a capacity rating of 550 MW, located in Gila Bend, Arizona.
It is anticipated that TEP will purchase a 75% undivided interest in Gila River Unit 3 (413 MW) for approximately $164 million and UNS Electric will purchase the remaining 25% undivided interest (137 MW) for approximately $55 million, although TEP and UNS Electric may modify the percentage ownership allocation between them. We expect the transaction to close in December 2014. See TEP, Factors Affecting Results of Operations, Gila River Generating Station Unit 3 and UNS Electric, Factors Affecting Results of Operations, Gila River Generating Station Unit 3. See also Note 8.
The purchase of Gila River Unit 3, which would replace the expiring coal-fired leased capacity from Springerville Unit 1 and the expected reduction of coal-fired generating capacity from San Juan Unit 2, is consistent with TEP's strategy to diversify its generation fuel mix. For more information on San Juan Unit 2, see Environmental Matters, Regional Haze Rules, San Juan, below.
Renewable Energy Resources
The ACC’s Renewable Energy Standard (RES) requires TEP, and other affected utilities, to increase their use of renewable energy each year until it represents at least 15% of their total annual retail energy requirements by 2025, with distributed generation accounting for 30% of the annual renewable energy requirement. Affected utilities must file an annual RES implementation plan for review and approval by the ACC. TEP plans to meet this requirement through a combination of owned resources and Power Purchase Agreements (PPAs). See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Rates and Regulations below for additional information regarding RES.
Owned Renewable Resources
As of December 31, 2013,2015, TEP owned 1846 MW of photovoltaic (PV) solar generating capacity. The SpringervilleIn 2016, TEP plans to complete an additional solar system, which is located near the Springerville Generating Station, has a total capacity of 6 MW. TEP’s remaining 12project adding 5 MW of PV solar generating capacity. The solar generating facilities are located on properties held under easements and leases. In December 2015, TEP also acquired a 5 MW concentrated solar project which does not increase capacity is located inbut displaces the Tucson area.equivalent amount of steam produced by burning fossil fuel.
In 2014, TEP expects to complete solar projects providing capacity of 20 MW at Ft. Huachuca, Arizona and 10 MW in Springerville, Arizona.

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Renewable Power Purchase Agreements
In order to meet the ACC’s renewable energy requirements,As of December 31, 2015, TEP has power purchase agreements (PPAs)renewable PPAs for 124175 MW of capacity measured in direct current (DC) from solar resources, 10280 MW of capacity measured in alternating current (AC) from wind resources and 4 MW of capacity measured in AC from a landfill gas generation plant. At December 31, 2013, approximately 88 MW of contracted solar resources and 51 MW of contracted wind resources were operational. The remaining resources are expected to be developed over the next several years. The solar PPAs contain options that allow TEP to purchase all or part of the related project at a future period. See Rates and Regulation, Renewable Energy Standard and Tariff, below.
Power Purchases and Interconnections
TEP purchases power from other utilities and power marketers. TEP may enter into contracts: (a)contracts to purchasepurchase: (i) energy under long-term contracts to serve retail load and long-term wholesale contracts, (b) to purchasecontracts; (ii) capacity or energy during periods of planned outages or for peak summer load conditions,conditions; and (c) to purchase(iii) energy for resale to certain wholesale customers under load and resource management agreements.
TEP typically uses generation from its gas-fired units, supplemented by power purchases, to meet the summer peak demands of its retail customers. Some of these power purchases are price-indexed to natural gas. Due to its increasing seasonal gas and purchased power usage, TEP hedges a portion of its total natural gas exposure with fixed price contracts for a maximum of three years. TEP also purchases energy in the daily and hourly markets to meet higher than anticipated demands, to cover unplanned generation outages, or when doing so is more economical than generating its own energy.

5



TEP is a member of a regional reserve-sharing organization and has reliability and power sharing relationships with other utilities. These relationships allow TEP to call upon other utilities during emergencies, such as plant outages and system disturbances, and reduce the amount of reserves TEP is required to carry.
As a result of the Energy Policy Act of 2005, owners and operators of bulk power transmission systems, including TEP, are subject to mandatory reliability standards that are developed and enforced by the North American Electric Reliability Corporation (NERC) and subject to the oversight of the FERC. TEP periodically reviews its operating policies and procedures to ensure continued compliance with these standards.
Springerville Units 3 and 4
Springerville Units 3 and 4 are each approximately 400 MW coal-fired generating facilities that are operated, but not owned by TEP. These facilities are located at the same site as Springerville Units 1 and 2. The owners of Springerville Units 3 and 4 compensate TEP for operating the facilities and pay an allocated portion of the fixed costs related to the Springerville Common Facilities and Coal Handling Facilities. See Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations, Tucson Electric Power Company, Factors Affecting Results of Operations, Springerville Units 3 and 4.PEAK DEMAND AND FUTURE RESOURCES
Peak Demand and Resources
Peak Demand2013 2012 2011 2010 2009
MW
(in MW)2015 2014 2013 2012 2011
Retail Customers2,230
 2,290
 2,334
 2,333
 2,354
2,222
 2,218
 2,230
 2,290
 2,334
Firm Sales to Other Utilities484
 286
 322
 340
 385
638
 673
 484
 286
 322
Coincident Peak Demand (A)2,714
 2,576
 2,656
 2,673
 2,739
2,860
 2,891
 2,714
 2,576
 2,656
         
Total Generating Resources2,240
 2,267
 2,262
 2,245
 2,229
2,452
 2,240
 2,240
 2,267
 2,262
Other Resources (1)
775
 683
 1,009
 799
 781
913
 932
 775
 683
 1,009
Total TEP Resources (B)3,015
 2,950
 3,271
 3,044
 3,010
3,365
 3,172
 3,015
 2,950
 3,271
Total Margin (B) – (A)301
 374
 615
 371
 271
505
 281
 301
 374
 615
Reserve Margin (% of Coincident Peak Demand)11% 15% 23% 14% 10%18% 10% 11% 15% 23%
(1) 
Other Resources include firm power purchases and interruptible retail and wholesale loads.
Peak demand occurs during the summer months due to the cooling requirements of TEP’s retail customers. Retail peak demand varies from year-to-year due to weather, economic conditions, and other factors. TEP’s retail peak demand declined over the period of 2009 to 2013 due primarily to weak economic conditions and the implementation of energy efficiency programs.
The chart above shows the relationship over a five-year period between TEP’s peak demand and its energy resources. TEP’s totalTotal margin is the difference between total energy resources and coincident peak demand, and the reserve margin is the ratio of

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margin to coincident peak demand. TEP’sThe reserve margin in 20132015 was in compliance with reliability criteria set forth by the Western Electricity Coordinating Council, a regional council of NERC.North American Reliability Corporation (NERC).
Peak demand occurs during the summer months due to the cooling requirements of retail customers. Retail peak demand varies from year-to-year due to weather, economic conditions, and other factors. Retail peak demand has primarily declined over the five-year period due to weak economic conditions and the implementation of energy efficiency programs and distributed generation.
Forecasted retail peak demand for 20142016 is 2,2532,109 MW compared with actual peak demand of 2,2302,222 MW in 2013.2015. TEP’s 20142016 estimated retail peak demand is based on weather patterns observed over a 10-year period.period and other factors, including estimates of customer usage and planned curtailment of mining customers. TEP believes existing generation capacity and power purchase agreementsPPAs are sufficient to meet expected demand in 2014.2016 and established reserve margin criteria.
Future Resources
At December 31, 2015, approximately 49% of TEP's generating capacity was fueled by coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating additional steps to reduce its dependency on coal generation while still meeting its peak load requirements. In August 2015, TEP exhausted its existing coal supply at Unit 4 of the H. Wilson Sundt Generating Station (Sundt Unit 4). TEP expects to continue operating Sundt Unit 4 on natural gas as a primary fuel source.
See Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Factors Affecting Results of Operations for additional information regarding TEP's generating facilities.

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FUEL SUPPLY
Fuel and Purchased Power Summary
Resource information is provided below:
Average Cost per kWh (cents per kWh) Percentage of Total kWh ResourcesAverage Cost per kWh (cents per kWh) Percentage of Total kWh Resources
2013 2012 2011 2013 2012 20112015 2014 2013 2015 2014 2013
Coal2.66
 2.54
 2.56
 75% 72% 73%2.44
 2.50
 2.66
 60% 68% 75%
Gas4.57
 4.54
 5.99
 8% 11% 7%3.35
 4.99
 4.57
 19% 9% 8%
Purchased Power4.83
 3.44
 3.94
 17% 17% 20%4.05
 4.79
 4.83
 21% 23% 17%
All Sources3.54
 3.19
 3.30
 100% 100% 100%3.31
 3.64
 3.54
 100% 100% 100%
Coal
TEP’s principal fuelThe coal used for electric generation is low-sulfur, bituminous or sub-bituminous coal from mines in Arizona and New Mexico. More than 90% of TEP’sThe table below provides information on the existing coal contracts that supply is purchased under long-term contracts, which results in more predictable prices.our generating stations. The average cost per ton of coal per million metric British thermal unit (MMBtu), including transportation, was $48.51$2.34 in 2013, $45.842015, $2.43 in 2012,2014, and $46.64$2.57 in 20112013..
StationCoal Supplier 
2013 Coal
Consumption
(tons in 000’s)
 
Contract
Expiration
 
Avg.
Sulfur
Content
 
Coal Obtained  From(1)
 Coal Supplier 2015 Coal
Consumption
(tons in 000s)
 
Contract
Expiration
 
Avg.
Sulfur
Content
 Coal Obtained From
Springerville(1)Peabody Coalsales 3,172 2020 1.0% Lee Ranch Coal Co. Peabody CoalSales 2,676 2020 1.0% Lee Ranch Mine/El Segundo Mine
Four Corners(2)
BHP Billiton 381 2016 0.8% Navajo Indian Tribe BHP Billiton 378 2031 0.7% Navajo Mine
San Juan(3)San Juan Coal Co. 1,306 2017 0.8% Federal and State Agencies San Juan Coal Co. 1,079 2022 0.8% San Juan Mine
NavajoPeabody Coalsales 560 2019 0.6% Navajo and Hopi Indian Tribes Peabody CoalSales 510 2019 0.6% Kayenta Mine
(1) 
Substantially allPeabody has a pending sale of the suppliers’ mining leases extend at least as long as coal is being mined in economic quantities.Lee Ranch Mine/El Segundo Mine to Bowie Resources Partners.
(2)
Beginning in July 2016 through June 2031, the coal for Four Corners will be purchased from the Navajo Transitional Energy Company (NTEC). NTEC purchased the mine located near Four Corners from BPHBHP Billiton and will begin operatingoverseeing the mine operation in 2016.
(3)
BHP Billiton sold San Juan Coal Co. to Westmoreland Coal Company, effective January 31, 2016.
TEP Operated Generating Facilities
The coal supplies for Springerville Units 1 and 2 are transported approximately 200 miles by railroad from northwestern New Mexico. TEP expects coal reserves to be sufficient to supply the estimated requirements for Springerville Units 1 and 2 for their presently estimated remaining lives.
Prior to 2010,TEP no longer uses coal as a primary fuel source for Sundt Unit 4 was predominantly fueled by coal; however, the generating station also can be operated with natural gas. Both fuels are combined with methane, a renewable energy resource, delivered from a nearby landfill. Since 2010, TEP has fueled Sundt Unit 4 with both coal and natural gas depending on which resource is most economic. In 2014, TEP expects to fuel Sundt Unit 4 primarily with existing coal supplies at the site. See Note 7.4.
Coal Generating Facilities Operated by Others
TEP also participates in jointly-owned coal-fired generating facilities at the Four Corners Generating Station (Four Corners), the Navajo Generating Station (Navajo), and the San Juan Generating Station (San Juan). Four Corners, which is operated by Arizona Public Service Company (APS), and San Juan, which is operated by Public Service Company of New Mexico (PNM), are mine-mouth generating stations located adjacent to the coal reserves. Navajo, which is operated by SRP, obtains its coal supply from athe nearby Kayenta coal mine and receives deliveries on a dedicated electric rail delivery system. TheEffective January 31, 2016, Westmoreland Coal Company purchased San Juan Coal Company (SJCC) from BHP Billiton and has also agreed to a new coal supplies are under long-term contracts administered by the

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operating agents.supply agreement extending through June 30, 2022. TEP expects the available coal reserves of the suppliersavailable to these three jointly-owned generating facilities to be sufficient for the remaining estimated lives of the stations.
Natural Gas Supply
TEP typically uses generation from its facilities fueled by natural gas, in addition to energy from its coal-fired facilities and purchased power, to meet the summer peak demands of its retail customers and local reliability needs. TEP purchasesThe average cost of natural gas from Southwest Gas Corporation under a retail tariff for North Loop’s 95 MW of internal combustion turbinesper MMBtu, including transportation, was $3.49 in 2015, $5.17 in 2014, and receives distribution service under a transportation agreement for DeMoss Petrie, a 75 MW internal combustion turbine. $4.55 in 2013.

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TEP purchases capacity from El Paso Natural Gas (EPNG) for transportation from the San Juan and Permian Basins to its Sundt plant under firm transportation agreements and buys gas from third-party suppliers for Sundt and DeMoss Petrie.
agreements. TEP also purchases firm gas transportation for Gila River Unit 3 from EPNG and Transwestern Pipeline Co., and for Luna Generating Station (Luna) from EPNGEPNG. TEP purchases gas from the San JuanSouthwest Gas Corporation under a retail tariff for North Loop’s 94 MW of internal combustion turbines and Permian Basins, utilizing firmreceives distribution service under a transportation agreements with EPNG.agreement for DeMoss Petrie, a 75 MW internal combustion turbine.
TRANSMISSION ACCESSAND DISTRIBUTION
TEP's transmission system is part of the Western Interconnection, which includes the interconnected transmission systems of 14 western states, two Canadian provinces and parts of Mexico. TEP's transmission system, together with contractual rights on other transmission systems, enables TEP has transmissionto integrate and access and power transaction arrangements with over 140 electric systems or suppliers. TEP also has various ongoing projects that are designedgeneration resources to increase access to the regional wholesale energy market and improve the reliability, capacity and efficiency ofmeet its existingcustomer load requirements. TEP's transmission and distribution systems.systems included approximately 2,170 miles of transmission lines, and 7,557 miles of distribution lines as of December 31, 2015.
In 2015, TEP is participating in the continuation of the 500 kVcompleted construction and placed into service a 500-Kilo-volt (kV) transmission line from the Pinal West substation to the Pinal Central substation. This project is expected to be in service in 2014.  TEP is also finalizing the engineering design for a 40-mile 500-kV transmission lineextending from the Pinal Central substation to TEP’s Tortolita substation northwest of Tucson to further enhance its ability to access the region’s energy resources. TEP expects the Pinal Central to Tortolita line to be in service in 2016. As a result of these transmission additions, TEP expects that its ability to import energy into its service territory would increase by at least 250 MW.
Discontinued Transmission Project
TEP and UNS Electric are parties to aTucson. The transmission line project initiated in responsewas built to an order byprovide additional transmission capacity from the ACC to UNS Electric to improve the reliability of electricPalo Verde area into TEP’s northern service in Nogales, Arizona. TEP had previously capitalized $11 million related to the project, including $2 million to secure land and land rights. UNS Electric had previously capitalized $0.4 million related to the project.
TEP and UNS Electric will not proceed with the project based on the estimated cost of the proposed line, the difficulty in reaching agreement with the Forest Service on a path for the line, and concurrence by the ACC of transmission plans filed by TEP and UNS Electric supporting the elimination of this project.  In 2012, TEP and UNS Electric wrote off a portion of the capitalized costs believed not probable of recovery and recorded a regulatory asset for the balance deemed probable of recovery. TEP and UNS Electric believe it is probable that we will recover at least $5 million and $0.2 million, respectively, of costs incurred through 2013. See Note 7.territory.
RATES AND REGULATION
2013 TEPThe ACC and the FERC each regulate portions of the utility accounting practices and rates of TEP. The ACC regulates rates charged to retail customers, the siting of generation and transmission facilities, the issuance of debt, transactions with affiliated parties, and other utility matters. The ACC also enacts other regulations and policies that can affect business decisions and accounting practices. The FERC regulates terms and prices of transmission services and wholesale electricity sales.
2015 Rate OrderCase
In June 2013,November 2015, TEP filed a general rate case with the ACC issued an order (2013 TEPrequesting a Base Rate Order) that resolved theincrease of $110 million and various rate case filed by TEPdesign changes. See Note 2 of Notes to Consolidated Financial Statements in July 2012, which was based on a test year ended December 31, 2011. The 2013 TEP Rate Order approved new rates effective July 1, 2013.Item 8 of this From 10-K and SeePart II, Item 7. - Management’s Discussion and Analysis of Financial Condition and Results of Operations, Tucson Electric Power, Factors Affecting Results of Operations 2013 TEPfor key provisions regarding the 2015 Rate Order.Case.
Purchased Power and Fuel Adjustment Clause
The Purchased Power and Fuel Adjustment Clause (PPFAC) allows TEP to recover its fuel, transmission, and purchased power costs, including demand charges, and the prudent costs of contracts for hedging fuel and purchased power costs for its retail customers. The PPFAC consists of a forward component and a true-up component.
The true-up component will reconcilereconciles any over/under collected amounts from the preceding 12-month period and will beis credited to or recovered from customers in the subsequent year.
TEP’s PPFAC also includes the recovery of the following costs and/or credits: lime costs used to control SO2sulfur dioxide (SO2) emissions net ofat Springerville; sulfur credits received from TEP’s coal suppliers; broker fees; 100% ofrevenues from short-term wholesale revenuessales; and all of the proceeds from the sale of SO2SO2 allowances.

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The 2013 TEP Rate Order approved a new PPFAC rate, effective July 1, 2013, which is a credit to retail customers of 0.14 cents per kWh. This PPFAC rate will be in effect until the rate is reset by the ACC in the second quarter of 2014.
TEP’s current PPFAC rate includes:
a reduction in the PPFAC bank balance, recorded in June 2013 as an increase to fuel expense, of $3 million related to prior sulfur credits; and
a transfer of $10 million, recorded in June 2013, from the PPFAC bank balance to a new regulatory asset to defer coal costs related to the San Juan mine fire. These costs will be eligible for recovery through the PPFAC upon final insurance settlement.

Beginning on July 1, 2013, net lime expense is recovered through the PPFAC; these expenses were previously recorded in O&M expense.
At December 31, 2013,2015, TEP had under-collectedover-collected fuel and purchased power costs on a billed-to-customer basis of $14by $18 million.
In February 2014, TEP filed a request with the ACC to reset the PPFAC in order to collect the under-collected balance from customers.
Renewable Energy StandardStandards and Tariff
The ACC’s Renewable Energy Standard (RES)RES requires TEP UNS Electric, and other affected utilities to increase their use of renewable energy each year until it represents at least 15% of their total annual retail energy requirements in 2025.2025, with distributed generation accounting for 30% of the annual renewable energy requirement. Affected utilities must file an annual RES implementation plansplan for review and approval by the ACC. The approved cost of carrying out those plans is recovered from retail customers through the RES surcharge. In 2010, the ACC approved a funding mechanism that allows TEP to recover operating costs, depreciation, property taxes, and a return on investments in company-owned solar projects through RES fundssurcharge until such costs are reflected in TEP’s Base Rates. The associated lost revenues attributable to meeting distributed generation targets will be partially recovered through the Lost Fixed Cost Recovery Mechanism (LFCR). See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
In October 2013,July 2015, TEP submitted its application for the ACC approved TEP's 20142016 RES implementation plan. Underplan that includes a budget of $57 million, which will be partially offset by applying approximately $9 million of previously recovered carryover funds. TEP proposed to recover $48 million through the plan, TEP expects to collect approximately $34 million from retail customers during 2014 toRES surcharge. The budget will fund the following: the above market cost of renewable energy purchases; performance basedpreviously awarded performance-based incentives for customer installed distributed generation; depreciation and a return on and of TEP's investments in company-owned solar projects; and various other program costs. The plan includes approval forTEP expects to receive a

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decision on the application in the first half 2016. TEP investmentexpects to recognize approximately $9 million of $28 millionrevenue in 2014 for2016 as a return on company-owned solar projects and an additional $12 million in 2015. TEP metprojects.
The percentage of retail kilowatt-hour (kWh) sales attributable to the 20132015 RES renewable energy targetrequirement was 8.6%, exceeding the overall 2015 requirement of 4.0% of retail kWh sales and5.0%. TEP expects to meet the 2014 target2016 RES renewable energy requirement of 4.5%.6.0% of retail kWh sales. Compliance is determined through the ACC's review of TEP's annual RES implementation plan. As TEP no longer pays incentives to obtain distributed generation Renewable Energy Credits (REC), which are used to demonstrate compliance with the distributed generation requirement, TEP has requested a waiver of the RES distributed generation requirements in its 2016 RES implementation plan.
Electric Energy Efficiency Standards
In 2010, the ACC approved new Electric EEEnergy Efficiency Standards (EE Standards) designed to require electric utilities to implement cost-effective programs to reduce customers' energy consumption. The Electric EE Standards require increasing cumulative annual targeted retail kWh savings equal to 22% by 2020. Since the implementation of the Electric EE Standards, TEP’s cumulative annual energy savings isare approximately 4.4%9.3% of retail kWh sales.
DSM programs approved bysales in 2015. Compliance with the ACC, direct load control programs, and energy efficient building codes are acceptable means to meet the Electric EE Standards as set forth byis determined through the ACC.
The 2013 TEP Rate Order approved (i) a Lost Fixed Cost Recovery (LFCR) mechanism that will allow TEP to recover certain non-fuel costs that would otherwise go unrecovered due to reduced kWh sales attributed toACC's review of the company's annual energy efficiency programs and distributed generation, and (ii) an energy efficiency provision that included a 2013 calendar year budget to fund programs that support the ACC's Electric EE Standards as well as a new performance incentive. See Item. 7-Management’s Discussion and Analysis of Financial Condition and Result of Operations, Tucson Electric Power, Factors Affecting Results of Operations, 2013 TEP Rate Order.
Competition
Retail Electric Competition Rulesimplementation plan.
In 1999,February 2016, the ACC approved TEP’s 2016 energy efficiency implementation plan. Under the Retail Electric Competition Rules (Rules) that provided a framework for the introduction of retail electric competition in Arizona. Certain portions of the Rules that enabled Electric Service Providers (ESPs)2016 plan, TEP has been approved to compete in the retail market were invalidated by an Arizona Court of Appeals decision in 2004. During 2012 and 2013, several companies filed applications for a Certificate of Convenience and Necessity (CC&N) with the ACC to provide competitive

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retail electric services in TEP's service territory as an ESP. Unless and until the ACC clarifies the Rules and/or grants a CC&N to an ESP, it is not possible for TEP'srecover approximately $14 million from retail customers to use an alternative ESP.
In May 2013,and will offer customers new and existing DSM programs. Energy savings realized through the ACC considered the possibility of opening Arizona to retail electric competition. After receiving comments from various parties, the ACC voted to close the docket in September 2013 and did not take any steps to implement retail electric competition. See Item. 7—Management’s Discussion and Analysis of Financial Condition and Result of Operations, Tucson Electric Power, Factors Affecting Results of Operations, Competition, Retail Electric Competition Rules.
Technological Developments and Energy Efficiency
New technological developmentsprograms will count toward Arizona’s EE Standards and the implementationassociated lost revenue will be partially recovered through the LFCR. See Note 2 of the Electric EE Standards have reduced energy consumption by TEP's retail customers. TEP's customers also have the abilityNotes to install renewable energy technologies and conventional generation units that could reduce their reliance on TEP's services.

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TableConsolidated Financial Statements in Item 8 of Contentsthis Form 10-K for additional information.

TEP’S UTILITY OPERATING STATISTICS
 2013 2012 2011 2010 2009
Generation and Purchased Power – kWh (000)         
Remote Generation10,586,972
 10,284,612
 10,005,127
 9,077,032
 9,134,183
Local Tucson Generation (Oil, Gas, & Coal)674,443
 803,146
 906,496
 1,492,885
 1,131,399
Renewable Generation38,206
 44,930
 28,049
 24,511
 23,712
Purchased Power2,328,581
 2,328,420
 2,686,918
 2,846,005
 3,809,890
Total Generation and Purchased Power13,628,202
 13,461,108
 13,626,590
 13,440,433
 14,099,184
Less Losses and Company Use885,026
 789,613
 822,220
 879,423
 936,206
Total Energy Sold12,743,176
 12,671,495
 12,804,370
 12,561,010
 13,162,978
Sales – kWh (000)         
Residential3,866,665
 3,820,637
 3,888,011
 3,869,540
 3,905,696
Commercial2,187,095
 2,187,617
 2,184,241
 2,171,694
 2,205,045
Industrial2,113,659
 2,132,214
 2,145,163
 2,138,749
 2,160,946
Mining1,079,150
 1,092,518
 1,083,071
 1,079,327
 1,064,830
Other32,350
 31,833
 31,621
 32,478
 34,226
Total – Electric Retail Sales9,278,919
 9,264,819
 9,332,107
 9,291,788
 9,370,743
Electric Wholesale Sales3,464,257
 3,406,676
 3,472,263
 3,269,222
 3,792,235
Total Electric Sales12,743,176
 12,671,495
 12,804,370
 12,561,010
 13,162,978
Operating Revenues ($000)         
Residential$400,999
 $387,840
 $383,908
 $372,212
 $377,761
Commercial252,547
 247,157
 241,044
 233,567
 236,836
Industrial164,433
 166,739
 164,024
 159,937
 163,720
Mining65,094
 66,158
 65,720
 62,112
 61,033
Other2,809
 2,693
 2,601
 2,593
 2,723
RES, DSM, ECA and LFCR48,475
 45,292
 46,633
 37,767
 25,443
Total – Electric Retail Sales934,357
 915,879
 903,930
 868,188
 867,516
Wholesale Revenue- Long-Term26,203
 24,910
 41,056
 55,653
 48,249
Wholesale Revenue- Short-Term91,467
 71,257
 72,798
 71,435
 84,410
California Power Exchange Provision for Wholesale Refunds
 
 
 (2,970) (4,172)
Transmission14,830
 15,793
 16,392
 20,863
 18,974
Other Revenues129,833
 133,821
 122,210
 112,098
 84,361
Total Operating Revenues$1,196,690
 $1,161,660
 1,156,386
 $1,125,267
 $1,099,338
Customers (End of Period)         
Residential372,411
 369,480
 367,396
 366,217
 365,157
Commercial37,913
 37,672
 37,536
 37,215
 37,027
Industrial617
 632
 636
 635
 629
Mining4
 4
 4
 4
 4
Public Authorities1,857
 1,833
 1,814
 1,829
 1,839
Total Retail Customers412,802
 409,621
 407,386
 405,900
 404,656
Average Retail Revenue per kWh Sold (cents)         
Residential10.4
 10.2
 9.9
 9.6
 9.7
Commercial11.5
 11.3
 11.0
 10.8
 10.7
Industrial and Mining7.2
 7.2
 7.1
 6.9
 7.0
Average Retail Revenue per kWh Sold (excludes RES, DSM, ECA and LFCR)9.5
 9.4
 9.2
 8.9
 9.0
Average Revenue per Residential Customer$1,077
 $1,050
 $1,045
 $1,016
 $1,035
Average kWh Sales per Residential Customer10,383
 10,341
 10,583
 10,566
 10,696

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ENVIRONMENTAL MATTERS
Environmental Regulation
The Environmental Protection Agency (EPA) limitsEPA regulates the amount of sulfur dioxide (SO2)SO2, nitrogen oxide (NOx)(NOx), carbon dioxide (CO2), particulate matter, mercury and other emissions released into the atmosphereby-products produced by power plants. TEP may incur added costs to comply with future changes in federal and state environmental laws, regulations, and permit requirements at its power plants. Complying withEnvironmental laws and regulations are subject to a range of interpretations, which may ultimately be resolved by the courts. Because these changes may reduce operating efficiency.laws and regulations continue to evolve, TEP is unable to predict the impact of the changing laws and regulations on its operations and consolidated financial results. TEP expects to recover the cost of environmental compliance from its ratepayers.
National Ambient Air Quality Standards
In October 2015, the EPA released the final rule for the 8-hour Ozone NAAQS or Ozone Standard. The EPA lowered the standard from 75 parts per billion (ppb) to 70ppb. If Pima County does not meet the standard, the county will be designated as a “non-attainment” area and will need to develop a plan to bring the air-shed into compliance. A “non-attainment” designation may slow economic growth in the region and impact our ability to site new local generation.
Implementation of the rule is scheduled as follows:
States’ recommendation of area designations (attainment, non-attainment, or unclassified) by October 2016.
EPA's response to states’ designation recommendation by June 2017.
EPA's finalization of area designations by October 2017, based on 2014-2016 air quality data.
Effluent Limitation Guidelines
In September 2015, as part of the Clean Water Act the EPA published the final Effluent Limitation Guidelines setting technology standards and limitations for steam electric power plant discharges. The rule sets the first federal limits on the levels of toxic metals in wastewater that can be discharged from power plants, based on technology improvements in the steam electric power industry over the last three decades. TEP is evaluating the effects of this rule on its facilities including Navajo, San Juan, and Four Corners. Since the majority of TEP's facilities are zero discharge, TEP does not anticipate a significant financial impact.
TEP believes it is in material compliance with applicable laws and regulations. Refer to Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Environmental Laws and Regulations of this Form 10-K for additional information related to environmental laws and regulations impacting TEP's liquidity and capital resources and Liquidity and Capital Resources for TEP's forecasted environmental-related capital expenditures.

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EMPLOYEES
At December 31, 2015, TEP had 1,478 employees, of which approximately 688 were represented by the International Brotherhood of Electrical Workers (IBEW) Local No. 1116. A new collective bargaining agreement between the IBEW and TEP was entered into in January 2016 and expires in January 2019.

SEC REPORTS AVAILABLE ON TEP'S WEBSITE
TEP makes available its annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports as soon as reasonably practical after we electronically file or furnish them to the Securities and Exchange Commission (SEC). These reports are available free of charge through TEP’s website address at www.tep.com/about/investors/.
UNS Energy’s code of ethics, which applies to the Board of Directors and all officers and employees of UNS Energy and its subsidiaries, including TEP, and any amendments or any waivers made to the code of ethics, is also available on TEP’s website at www.tep.com/about/investors/.
TEP is providing the address of TEP’s website solely for the information of investors and does not intend the address to be an active link. Information contained at TEP’s website is not part of, or incorporated by reference into, any report or other filing filed with the SEC by TEP.

ITEM 1A. RISK FACTORS
The business and financial results of TEP are subject to a number of risks and uncertainties, including those set forth below. These risks and uncertainties fall primarily into five major categories: revenues, regulatory, environmental, financial, and operational.
REVENUES
National and local economic conditions can negatively affect the results of operations, net income, and cash flows at TEP.
Economic conditions have contributed significantly to a reduction in TEP’s retail customer growth and lower energy usage by the company’s residential, commercial, and industrial customers. As a result of weak economic conditions, TEP’s average retail customer base grew by less than 1% in each year from 2011 through 2015 compared with average increases of approximately 1% in each year from 2005 to 2009. TEP estimates that a 1% change in annual retail sales could impact pre-tax net income and pre-tax cash flows by approximately $6 million.
New technological developments and compliance with the ACC's EE Standards and RES will continue to have a significant impact on retail sales, which could negatively impact TEP’s results of operations, net income, and cash flows.
Research and development activities are ongoing for new technologies that produce power or reduce power consumption. These technologies include renewable energy, customer-owned generation, and appliances, equipment, and control systems. Continued development and use of these technologies and compliance with the ACC's EE Standards could further impact the results of operations, net income, and cash flows of TEP.
The revenues, results of operations, and cash flows of TEP are seasonal, and are subject to weather conditions and customer usage patterns, which are beyond the company’s control.
TEP typically earns the majority of its operating revenue and net income in the third quarter because retail customers increase their air conditioning usage during the summer. Conversely, TEP’s first quarter net income is typically limited by relatively mild winter weather in its retail service territory. Cool summers or warm winters may reduce customer usage, adversely affecting operating revenues, cash flows, and net income by reducing sales.
TEP is dependent on a small segment of large customers for future revenues. A reduction in the electricity sales to these customers would negatively affect our results of operations, net income, and cash flows.
TEP sells electricity to mines, military installations, and other large industrial customers. In 2015, 35% of TEP’s retail kWh sales were to 592 industrial and mining customers. Retail sales volumes and revenues from these customer classes could

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decline as a result of, among other things: global, national, and local economic conditions; curtailments of customer operations due to declines in commodity prices; decisions by the federal government to close military bases; the effects of energy efficiency and distributed generation; or the decision by customers to self-generate all or a portion of their energy needs. A reduction in retail kWh sales to TEP’s large customers would negatively affect our results of operations, net income, and cash flows.
REGULATORY
TEP is subject to regulation by the ACC, which sets the company’s Retail Rates and oversees many aspects of its business in ways that could negatively affect the company’s results of operations, net income, and cash flows.
The ACC is a constitutionally created body composed of five elected commissioners. Commissioners are elected state-wide for staggered four-year terms and are limited to serving a total of two terms. As a result, the composition of the commission, and therefore its policies, are subject to change every two years.
TEP’s Retail Rates consist of Base Rates and various rate adjustors that allow for timely recovery of certain costs between rate cases. The ACC is charged with setting Retail Rates that allow TEP to recover its costs of service and an opportunity to earn a reasonable rate of return. In setting TEP’s Retail Rates, the ACC could disallow the recovery of costs or not provide for the timely recovery of costs. The decisions made by the ACC on such matters impact the net income and cash flows of TEP.
Changes in federal energy regulation may negatively affect the results of operations, net income, and cash flows of TEP.
TEP is subject to the impact of comprehensive and changing governmental regulation at the federal level that continues to change the structure of the electric and gas utility industries and the ways in which these industries are regulated. TEP is subject to regulation by the FERC. The FERC has jurisdiction over rates for electric transmission in interstate commerce and rates for wholesale sales of electric power, including terms and prices of transmission services and sales of electricity at wholesale.
As a result of the Energy Policy Act of 2005, owners and operators of bulk power systems, including TEP, are subject to mandatory transmission standards developed and enforced by NERC and subject to the oversight of the FERC. Compliance with modified or new transmission standards may subject TEP to higher operating costs and increased capital costs. Failure to comply with the mandatory transmission standards could subject TEP to sanctions, including substantial monetary penalties.
ENVIRONMENTAL
TEP is subject to numerous environmental laws and regulations that may increase its cost of operations or expose it to environmentally-related litigation and liabilities.Many of these regulations could have a significant impact on TEP due to its reliance on coal as its primary fuel for electric generation.
Numerous federal, state, and local environmental laws and regulations affect present and future operations. Those laws and regulations include rules regarding air emissions, water use, wastewater discharges, solid waste, hazardous waste, and management of coal combustion residuals.
These laws and regulations can contribute to higher capital, operating, and other costs, particularly with regard to enforcement efforts focused on existing power plants and new compliance standards related to new and existing power plants. These laws and regulations generally require us to obtain and comply with a wide variety of environmental licenses, permits, authorizations, and other approvals. Both public officials and private individuals may seek to enforce applicable environmental laws and regulations. Failure to comply with applicable laws and regulations may result in litigation, and the imposition of fines, penalties, and a requirement by regulatory authorities for costly equipment upgrades.
Existing environmental laws and regulations may be revised and new environmental laws and regulations may be adopted or become applicable to our facilities. Increased compliance costs or additional operating restrictions from revised or additional regulation could have an adverse effect on our results of operations, particularly if those costs are not fully recoverable from our customers. TEP’s obligation to comply with the EPA’s Best Available Retrofit Technology (BART) determinations as a participant in the San Juan, Four Corners, and Navajo plants, coupled with the financial impact of future climate change legislation, other environmental regulations and other business considerations, could jeopardize the economic viability of these plants or the ability of individual participants to meet their obligations and willingness to continue their participation in these plants. TEP cannot predict the ultimate outcome of these matters.
TEP also is contractually obligated to pay a portion of the environmental reclamation costs incurred at generating stations in which it has a minority interest and is obligated to pay similar costs at the mines that supply these generating stations. While TEP has recorded the portion of its costs that can be determined at this time, the total costs for final reclamation at these sites are unknown and could be substantial.

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Federal regulations limiting greenhouse gas emissions require a shift in generation from coal to natural gas and renewable generation and could increase TEP's cost of operations.
In August 2015, the EPA issued the Clean Power Plan (CPP) limiting CO2 emissions from existing and new fossil fueled power plants. The CPP establishes state-level CO2 emission rates and mass-based goals that apply to fossil fuel-fired generation. The plan requires CO2 emission reductions for existing facilities by 2030 and establishes interim goals that begin in 2022. The CPP will require a shift in generation from coal to natural gas and renewables and could lead to the early retirement of coal generation in Arizona within the 2022 to 2030 compliance time-frame. TEP will continue to work with the other Arizona and New Mexico utilities, as well as the appropriate regulatory agencies, to develop compliance strategies. TEP is unable to determine how the final CPP rule will impact its facilities until the plans are developed and approved by the EPA.
Early closure of TEP's coal-fired generation plants resulting from environmental regulations could result in TEP recognizing impairments in respect of such plants and increased cost of operations if recovery of our remaining investments in such plants and the costs associated with such early closures were not permitted through rates charged to customers.
TEP's coal-fired generating stations may be required to be closed before the end of their useful lives in response to recent or future changes in environmental regulation, including potential regulation relating to greenhouse gas emissions. If any of the coal-fired generation plants, or coal handling facilities, from which TEP obtains power are closed prior to the end of their useful life, TEP could be required to recognize an impairment of its assets and incur added expenses relating to accelerated depreciation and amortization, decommissioning, reclamation and cancellation of long-term coal contracts of such generating plants and facilities. Closure of any of such generating stations may force TEP to incur higher costs for replacement capacity and energy. TEP may not be permitted full recovery of these costs in the rates it charges its customers. As of December 31, 2015, approximately 49% of TEP's generating capacity is fueled by coal.
FINANCIAL
The Third-Party Owners of Springerville Unit 1 have and may continue to refuse to pay some, or all, of their pro-rata share of the costs and expenses associated with SpringervilleUnit 1.
TEP owns 49.5% of Springerville Unit 1 and two separate third-parties own the remaining 50.5%. Starting in January 2015, TEP is obligated to operate Springerville Unit 1 for these Third-Party Owners under existing agreements. TEP and the Third-Party Owners disagree on several key aspects of these agreements, including the allocation of Springerville Unit 1 operating and maintenance expenses, capital improvement costs, and transmission rights. In addition, since late 2014 the Third-Party Owners have filed separate complaints at the FERC, in New York State court, and with the American Arbitration Association that include allegations that TEP violated certain provisions of the governing agreements in relation to TEP’s operation of Springerville Unit 1. Because of these disagreements and the pending litigation, the Third-Party Owners have and may continue to refuse to pay some or all of their pro-rata share of such Springerville Unit 1 costs and expenses. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016. The Third-Party Owners’ share of estimated 2016 operations and maintenance costs for Springerville Unit 1 is approximately $27 million and their share of estimated 2016 capital expenditures is approximately $9 million.
Volatility or disruptions in the financial markets, or unanticipated financing needs, could: increase our financing costs; limit our access to the credit markets; affect our ability to comply with financial covenants in our debt agreements; and increase our pension funding obligations. Such outcomes may adversely affect our liquidity and our ability to carry out our financial strategy.
We rely on access to the bank markets and capital markets as a significant source of liquidity and for capital requirements not satisfied by the cash flow from our operations. Market disruptions such as those experienced in 2008 and 2009 in the United States and abroad may increase our cost of borrowing or adversely affect our ability to access sources of liquidity needed to finance our operations and satisfy our obligations as they become due. These disruptions may include turmoil in the financial services industry, including substantial uncertainty surrounding particular lending institutions and counterparties we do business with, unprecedented volatility in the markets where our outstanding securities trade, and general economic downturns in our utility service territories. If we are unable to access credit at competitive rates, or if our borrowing costs dramatically increase, our ability to finance our operations, meet our short-term obligations, and execute our financial strategy could be adversely affected.
Changing market conditions could negatively affect the market value of assets held in our pension and other retiree plans and may increase the amount and accelerate the timing of required future funding contributions.

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Plant closings or changes in power flows into our service territory could require us to redeem or defease some or all of the tax-exempt bonds issued for our benefit. This could result in increased financing costs.
TEP has financed a substantial portion of utility plant assets with the proceeds of pollution control revenue bonds and industrial development revenue bonds issued by governmental authorities. Interest on these bonds is, subject to certain exceptions, excluded from gross income for federal tax purposes. This tax-exempt status is based, in part, on continued use of the assets for pollution control purposes or the local furnishing of energy within TEP’s two-county retail service area.
As of December 31, 2015, there were outstanding approximately $309 million aggregate principal amount of tax-exempt bonds that financed pollution control facilities at TEP’s generating units. Should certain of TEP’s generating units be retired and dismantled prior to the stated maturity dates of the related tax-exempt bonds, it is possible that some or all of the bonds financing such facilities would be subject to mandatory early redemption by TEP. Of the total amount outstanding, $37 million of the principal amount of the bonds can currently be redeemed at par upon notice to holders, and $272 million principal amount of the bonds have early redemption dates or final maturities ranging from 2019 to 2022.
In addition, as of December 31, 2015, there were outstanding approximately $307 million aggregate principal amount of tax-exempt bonds that financed local furnishing facilities. Depending on changes that may occur to the regional generation mix in the desert southwest, to the regional bulk transmission network, or to the demand for retail energy in TEP’s local service area, it is possible that TEP would no longer qualify as a local furnisher of energy within the meaning of the Internal Revenue Code. In recent years, reductions in retail demand in the winter months have made it increasingly difficult for TEP to continue to qualify as a local furnisher of electricity. If TEP could no longer qualify as a local furnisher of energy, all of TEP’s tax-exempt local furnishing bonds would be subject to mandatory early redemption by TEP or defeasance to the earliest possible redemption date. Of the total tax-exempt local furnishing bonds outstanding, $100 millionof the principal amount of the bonds can currently be redeemed at par upon notice to holders, and $207 million principal amount of the bonds have early redemption dates ranging from 2020 to 2023.
TEP’s net income and cash flows can be adversely affected by rising interest rates.
At December 31, 2015, TEP had $137 million of tax-exempt variable rate debt obligations. The interest rates are set weekly or monthly. The average weekly interest rates (including Letters of Credit (LOCs) and remarketing fees) ranged from 0.93% - 1.42% in 2015. The average monthly interest rates ranged from 0.79% - 0.87%. A 100 basis point increase in the average interest rates on this debt over a twelve-month period would increase TEP’s interest expense by approximately $1 million.
TEP is also subject to risk resulting from changes in the interest rate on its borrowings under the 2015 Credit Agreement. Such borrowings may be made on a spread over London Interbank Offer Rate (LIBOR) or an Alternate Base Rate.
If short-term interest rates rise, the resulting increase in the cost of variable rate borrowings would negatively impact our results of operations, net income, and cash flows. Likewise, if capital market conditions result in higher long-term interest rates, TEP’s borrowing costs would increase on any new long-term debt needed to finance capital expenditures or to refinance existing long-term debt.
OPERATIONAL
The operation of electric generating stations, and transmission and distribution systems, involves risks that could result in reduced generating capability or unplanned outages that could adversely affect TEP’s results of operations, net income, and cash flows.
The operation of electric generating stations, and transmission and distribution systems, involves certain risks, including equipment breakdown or failure, fires, weather, and other hazards, interruption of fuel supply, and lower than expected levels of efficiency or operational performance. Unplanned outages, including extensions of planned outages due to equipment failure or other complications, occur from time to time and are an inherent risk of our business. If TEP’s generating stations and transmission and distribution systems operate below expectations, TEP’s operating results could be adversely affected and/or TEP's capital spending could be increased.
TEP receives power from certain generating facilities that are jointly owned and operated by third parties. Therefore, TEP may not have the ability to affect the management or operations at such facilities which could adversely affect TEP’s results of operations, net income, and cash flows.
Certain of the generating stations from which TEP receives power are jointly owned with, or are operated by, third parties. TEP may not have the sole discretion or any ability to affect the management or operations at such facilities. As a result of this reliance on other operators, TEP may not be able to ensure the proper management of the operations and maintenance of the plants. Further, TEP may have no ability or a limited ability to make determinations on how best to manage the changing regulations which may

13




affect such facilities. In addition, TEP will not have sole discretion as to how to proceed in the face of requirements relating to environmental compliance which could require significant capital expenditures or the closure of such generating stations. A divergence in the interests of TEP and the co-owners or operators, as applicable, of such generating facilities could negatively impact the business and operations of TEP.
We may be subject to physical attacks.
As operators of critical energy infrastructure, we may face a heightened risk of physical attacks on our electric systems. Our electric generation, transmission, and distribution assets and systems are geographically dispersed and are often in rural or unpopulated areas which make them especially difficult to adequately detect, defend from, and respond to such attacks.
If, despite our security measures, a significant physical attack occurred, we could have our operations disrupted, property damaged, experience loss of revenues, response costs, and other financial loss; and be subject to increased regulation, litigation, and damage to our reputation, any of which could have a negative impact on our business and results of operations.
We may be subject to cyber attacks.
We may face a heightened risk of cyber attacks. Our information and operations technology systems may be vulnerable to unauthorized access due to hacking, viruses, acts of war or terrorism, and other causes. Our operations technology systems have direct control over certain aspects of the electric system and, in addition, our utility business requires access to sensitive customer data, including personal and credit information, in the ordinary course of business.
If, despite our security measures, a significant cyber breach occurred, we could have our operations disrupted, property damaged, and customer information stolen; experience loss of revenues, response costs, and other financial loss; and be subject to increased regulation, litigation, and damage to our reputation, any of which could have a negative impact on our business and results of operations.

ITEM 1B. UNRESOLVED STAFF COMMENTS
None.

ITEM 2. PROPERTIES
Transmission facilities owned by TEP and by third parties are located in Arizona and New Mexico and transmit the output from TEP’s electric generating stations at Four Corners, Navajo, San Juan, Springerville, Gila River, and Luna to the Tucson area for use by TEP’s retail customers. The transmission system is interconnected at various points in Arizona and New Mexico with other regional utilities. See Part I, Item 1. Business, General for additional information regarding the transmission facilities.
TEP's electric generating stations (except as noted below), administrative headquarters, warehouses and service centers are located on land owned by TEP. The electric distribution and transmission facilities owned by TEP are located:
on property owned by TEP;
under or over streets, alleys, highways, and other places in the public domain, as well as in national forests and state lands, under franchises, easements, or other rights which are generally subject to termination;
under or over private property as a result of easements obtained primarily from the record holder of title; or
over American Indian reservations under grant of easement by the Secretary of the Interior or lease by American Indian tribes.
It is possible that some of the easements, and the property over which the easements were granted, may have title defects or liens existing at the time the easements were acquired.
Springerville is located on property held by TEP under a term patent with the State of Arizona. TEP, under separate sale and leaseback arrangements, leases a 50% undivided interest in the Springerville Common Facilities (which do not include land).
Four Corners and Navajo are located on properties held under easements from the United States and under leases from the Navajo Nation. TEP, individually and in conjunction with PNM in connection with San Juan, has acquired land rights, easements and leases for the plant, transmission lines and a water diversion facility located on land owned by the Navajo

14




Nation. TEP also has acquired easements for transmission facilities related to San Juan, Four Corners, and Navajo located on reservation lands of the Zuni, Navajo, and Tohono O’odham Nations. TEP, in conjunction with PNM and Samchully Power & Utilities 1 LLC, holds an undivided ownership interest in the property on which Luna is located.
TEP’s rights under these various easements and leases may be subject to defects such as:
possible conflicting grants or encumbrances due to the absence of, or inadequacies in, the recording laws or record systems of the Bureau of Indian Affairs (BIA) and the American Indian tribes;
possible inability of TEP to legally enforce its rights against adverse claimants and the American Indian tribes without Congressional consent; or
failure or inability of the American Indian tribes to protect TEP’s interests in the easements and leases from disruption by the U.S. Congress, Secretary of the Interior, or other adverse claimants.
These possible defects have not interfered, and are not expected to materially interfere, with TEP’s interest in and operation of its facilities.
Under separate ground lease agreements, TEP leased parcels of land for the following photovoltaic facilities:
The Solar Zone of the University of Arizona Tech Park in Pima County, Arizona; and
Bright Tucson Community Solar Blocks in Pima County, Arizona.
In December 2014, TEP placed in service an additional photovoltaic facility in Cochise County, Arizona, for which TEP entered into a 30-year easement agreement. The easement is to facilitate the operations of a solar photovoltaic renewable energy generation system on behalf of the Department of the Army, located at Fort Huachuca in Cochise County.
See Item 1. Business, General for additional information regarding generating facilities.

ITEM 3. LEGAL PROCEEDINGS
Springerville Unit 1 Proceedings
Upon the termination of the Springerville Unit 1 Leases on January 1, 2015, 50.5% of Springerville Unit 1, or 195 MW of capacity, continued to be owned by third parties, Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the Third-Party Owners’ Springerville Unit 1 power.
Commencing on January 1, 2015, with the termination of the leases, TEP is obligated to operate the unit for the Third-Party Owners under existing agreements. In 2014, TEP and the Third-Party Owners engaged in discussions regarding the post-lease operation of Springerville Unit 1 and related cost sharing arrangements, but did not reach agreement on several key points.
In November 2014, the Springerville Unit 1 Third-Party Owners filed a complaint (FERC Action) against TEP at the FERC alleging that TEP had not agreed to wheel power and energy for the Third-Party Owners in the manner specified in the existing Springerville Unit 1 facility support agreement between TEP and the Third-Party Owners and for the cost specified by the Third-Party Owners. The Third-Party Owners requested an order from the FERC requiring such wheeling of the Third-Party Owners’ energy from their Springerville Unit 1 interests beginning in January 2015 to the Palo Verde switchyard and for the price specified by the Third-Party Owners. In February 2015, the FERC issued an order denying the Third-Party Owners complaint. In March 2015, the Third-Party Owners filed a request for rehearing in the FERC Action, which the FERC denied in October 2015. In December 2015, the Third-Party Owners appealed the FERC’s order denying the Third-Party Owners' complaint to the U.S. Court of Appeals for the Ninth Circuit. In December 2015, TEP filed an unopposed motion to intervene in the Ninth Circuit appeal.
On December 19, 2014, the Third-Party Owners filed a complaint against TEP in the Supreme Court of the State of New York, New York County (New York Action). In response to motions filed by TEP to dismiss various counts and compel arbitration of certain of the matters alleged, and the court’s subsequent ruling on the motions, the Third-Party Owners have amended the complaint three times, dropping certain of the allegations and raising others in the New York Action and in the arbitration proceeding described below. As amended, the New York Action alleges, among other things, that TEP failed to properly operate, maintain, and make capital investments in Springerville Unit 1 during the term of the leases and that TEP has breached

15




the lease transaction documents by refusing to pay certain of the Third-Party Owners’ claimed expenses. The third amended complaint seeks $71 million in liquidated damages and direct and consequential damages in an amount to be determined at trial. The Third-Party Owners have also agreed to stay their claim that TEP has not agreed to wheel power and energy as required pending the outcome of the FERC Action. In November 2015, the Third-Party Owners filed a motion for summary judgment on their claim that TEP has failed to pay certain of the Third-Party Owners’ claimed expenses.
In December 2014 and January 2015, Wilmington Trust Company, as Owner Trustees and Lessors under the leases of the Third-Party Owners, sent a notice to TEP that alleged that TEP had defaulted under the Third-Party Owners’ leases. The notices demanded that TEP pay liquidated damages totaling approximately $71 million. In letters to the Owner Trustees, TEP denied the allegations in the notices.
In April 2015, TEP filed a demand for arbitration with the American Arbitration Association (AAA) seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expenses and capital expenditures for Springerville Unit 1. In June 2015, the Third-Party Owners filed a separate demand for arbitration with the AAA alleging, among other things, that TEP has failed to properly operate, maintain and make capital investments in Springerville Unit 1 since the leases have expired. The Third-Party Owners’ arbitration demand seeks declaratory judgments, damages in an amount to be determined by the arbitration panel and the Third-Party Owners’ fees and expenses. TEP and the Third-Party Owners have since agreed to consolidate their arbitration demands into one proceeding. In August 2015, the Third-Party Owners filed an amended arbitration demand adding claims that TEP has converted the Third-Party Owners’ water rights and certain emission reduction payments and that TEP is improperly dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. The arbitration hearing is scheduled for July 2016.
In November 2015, TEP filed a petition to confirm the interim arbitration order in the Supreme Court of the State of New York naming the Owner Trustee and Co-Trustee as respondents. The petition seeks an order from the court confirming the interim arbitration order under the Federal Arbitration Act. In December 2015, the Owner Trustees filed an answer to the petition and a cross-motion to vacate the interim arbitration order.
As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
TEP cannot predict the outcome of the claims relating to Springerville Unit 1, and, due to the general and non-specific scope and nature of the claims, TEP cannot determine estimates of the range of loss, if any, at this time. TEP intends to vigorously defend itself against the claims asserted by the Third-Party Owners and to vigorously pursue the claims it has asserted against the Owner Trustees and Co-Trustees.
TEP and the Third-Party Owners have agreed to stay these litigation matters relating to Springerville Unit 1 in furtherance of settlement negotiations. However, there is no assurance that a settlement will be reached or that the litigation will not continue.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Factors Affecting Results of Operations for additional information regarding Springerville Unit 1.

ITEM 4. MINE SAFETY DISCLOSURES
Not applicable.


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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS, AND ISSUER PURCHASES OF EQUITY SECURITIES
Market Information
TEP’s common stock is wholly-owned by UNS Energy and is not listed for trading on any stock exchange.
Dividends
TEP paid dividends to UNS Energy of $50 million in 2015 and $40 million in 2014 and 2013.
TEP can pay dividends if it maintains compliance with its 2015 Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement which all contain substantially the same financial covenants. At December 31, 2015, TEP was in compliance with the terms of all financial covenants and agreements.
The ACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and reported to the ACC annually beginning on April 1, 2016. As of December 31, 2015, TEP's dividend payments were still restricted as the 50 percent of total capital threshold had not yet been reached.

ITEM 6. SELECTED FINANCIAL DATA
(in thousands)2015 2014 2013 2012 2011
Income Statement Data         
Operating Revenues$1,306,544
 $1,269,901
 $1,196,690
 $1,161,660
 $1,156,386
Net Income127,794
 102,338
 101,342
 65,470
 85,334
Balance Sheet Data         
Total Utility Plant, Net$3,558,229
 $3,425,190
 $2,944,455
 $2,750,421
 $2,650,652
Total Assets (1)
4,249,478
 4,119,830
 3,490,085
 3,413,638
 3,247,647
          
Long-Term Debt, Net (1)
$1,451,720
 $1,361,828
 $1,213,367
 $1,213,246
 $1,072,037
Non-Current Capital Lease Obligations55,324
 69,438
 131,370
 262,138
 352,720
Cash Flow Data         
Net Cash Flows From Operating Activities$364,934
 $313,663
 $346,191
 $267,919
 $268,294
Net Cash Flows From Investing Activities(502,891) (517,638) (259,662) (227,881) (312,011)
Net Cash Flows From Financing Activities119,471
 252,810
 (140,937) 11,987
 51,452
Other Data         
Ratio of Earnings to Fixed Charges (2)
3.74
 2.56
 2.67
 2.10
 2.40
(1)
Total Assets and Long-term Debt, Net were adjusted to reflect the reclassifications made as a result of the recently adopted accounting pronouncements. See Note 1 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding recently adopted accounting pronouncements.
(2)
For purposes of this computation, earnings are defined as pre-tax earnings from continuing operations before minority interest, or income/loss from equity method investments, plus interest expense and amortization of debt discount and expense related to indebtedness. Fixed charges are interest expense, including amortization of debt discount, interest on operating lease payments, and expense on indebtedness, including capital lease obligations.
See Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations for additional information.


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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Management’s Discussion and Analysis explains the results of operations, the general financial condition, and the outlook for TEP. It includes the following:
outlook and strategies;
operating results during 2015 compared with the same periods of 2014, and 2014 compared with 2013;
factors affecting our results and outlook;
liquidity, capital needs, capital resources, and contractual obligations;
dividends; and
critical accounting estimates.
Management’s Discussion and Analysis includes financial information prepared in accordance with Generally Accepted Accounting Principles in the United States of America (GAAP), as well as certain non-GAAP financial measures. The non-GAAP financial measures should be viewed as a supplement to, and not a substitute for, financial measures presented in accordance with GAAP. Non-GAAP financial measures as presented herein may not be comparable to similarly titled measures used by other companies.
Management’s Discussion and Analysis should be read in conjunction with Item 6 of this Form 10-K and the Consolidated Financial Statements and Notes in Item 8 of this Form 10-K. For information on factors that may cause our actual future results to differ from those we currently seek or anticipate, see Forward-Looking Information at the front of this report and Part I, Item 1A. Risk Factors for additional information.
References in this report to "we" and "our" are to TEP.

OUTLOOK AND STRATEGIES
TEP's financial prospects and outlook are affected by many factors including: global, national, regional, and local economic conditions; volatility in the financial markets; environmental laws and regulations; and other regulatory factors. Our plans and strategies include the following:
Achieving a constructive outcome in our pending rate case proceeding that provides TEP recovery of its full cost of service and an opportunity to earn an appropriate return on its rate base investments, updated rates to provide more accurate price signals and a more equitable allocation of costs to TEP's customers, and enables TEP to continue to provide safe and reliable service.
Continuing to focus on our long-term generation resource strategy, including shifting from coal to natural gas, renewables, and energy efficiency while providing rate stability for our customers, mitigating environmental impacts, complying with regulatory requirements, leveraging our existing utility infrastructure, and maintaining financial strength.
Developing strategic responses to new environmental regulations and potential new legislation, including new carbon emission standards to reduce greenhouse gas emissions from existing power plants. We are evaluating TEP's existing mix of generation resources and defining steps to achieve environmental objectives that protect the financial stability of our utility business and the interests of our customers.
Strengthening the underlying financial condition of TEP by achieving constructive regulatory outcomes, strengthening our capital structure, sustaining our credit ratings, and promoting economic development in our service territory.
Focusing on our core utility business through operational excellence, investing in utility rate base, emphasizing customer service, and maintaining a strong community presence.

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2015 Operational and Financial Highlights
The year ended December 31, 2015 included the following notable items:
In January 2015, TEP purchased an additional 24.8% undivided ownership interest in Springerville Unit 1, bringing its total ownership interest to 49.5%;
In January 2015, TEP purchased existing unsecured tax-exempt industrial development revenue bonds in the amount of $130 million using funds borrowed from the term loan portion of the 2014 Credit Agreement;
In February 2015, TEP issued and sold $300 million of unsecured notes;
In April 2015, TEP purchased an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities, and in May 2015, TEP sold a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
In June 2015, TEP terminated the 2014 Credit Agreement;
In June 2015, TEP received an equity contribution of $180 million from UNS Energy;
In October 2015, TEP entered into a new unsecured credit agreement (2015 Credit Agreement) that provides for a $250 million revolving credit and letter of credit (LOC) facility. The new credit agreement matures in 2020 and replaces the 2010 Credit Agreement;
In November 2015, TEP filed a general rate case with the ACC that requests, among other things, a Base Rate increase of $110 million. The application also requests that new rates become effective no later than January 1, 2017; and
In December 2015, TEP completed construction and placed into service a 500-kV transmission line extending from the Pinal Central substation to TEP’s Tortolita substation northwest of Tucson.

RESULTS OF OPERATIONS
The following discussion provides the significant items that affected TEP's results of operations for the years ended December 31, 2015, 2014 and 2013. The significant items affecting net income are presented on an after-tax basis.
2015 compared with 2014
TEP reported net income of $128 million in 2015 compared with $102 million in 2014. The increase of $26 million, or 25%, was primarily due to:
$16 million in lower O&M resulting primarily from acquisition related costs and outages at Springerville Units 1 and 2 that were incurred in 2014, partially offset by higher O&M related to Gila River, labor costs, and outside services;
$6 million in higher transmission revenue resulting primarily from an increase in sales volume on favorably priced contracts; and
$4 million in lower interest expense primarily due to a reduction in the balance of capital lease obligations.
2014 compared with 2013
TEP reported net income of $102 million in 2014 compared with $101 million in 2013. The increase of $1 million, or 1%, was primarily due to:
$25 million in higher revenues including a non-fuel Base Rate increase that was effective on July 1, 2013, an increase in LFCR revenues, higher long-term wholesale revenues due in part to an increase in the average market price and higher transmission revenue; and
$7 million in lower interest expense, primarily due to a reduction in the balance of capital lease obligations.
The increase was partially offset by:
$22 million in higher O&M for acquisition related costs, higher generating plant maintenance expense, and increased rent expense associated with the Navajo lease amendment;

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$5 million in higher income taxes primarily generated by a non-recurring $11 million tax benefit recorded in June 2013 to recover previously recorded income tax expense as a result of the 2013 TEP Rate Order. This amount is partially offset by a $2 million increase in the valuation allowance in 2013 and a $3 million increase in investment tax credits recorded in 2014. See Note 12 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding income taxes; and
$4 million in higher depreciation and amortization expenses, resulting primarily from an increase in asset base in the current year.

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Utility Sales and Revenues
The table below provides a summary of retail kWh sales, revenues, and weather data during 2015, 2014 and 2013:
 Year Ended Increase (Decrease) Year Ended Increase (Decrease)
 2015 2014 
Percent(1)
 2013 
Percent(1)
Electric Retail Sales (kWh in millions)         
Residential3,724
 3,727
 (0.1)% 3,867
 (3.6)%
Commercial2,124
 2,170
 (2.1)% 2,187
 (0.8)%
Industrial2,063
 2,098
 (1.7)% 2,114
 (0.8)%
Mining1,109
 1,137
 (2.5)% 1,079
 5.4 %
Public Authorities33
 33
  % 32
 3.1 %
Total Electric Retail Sales9,053
 9,165
 (1.2)% 9,279
 (1.2)%
Retail Margin Revenues (in millions)         
Residential$281
 $280
 0.4 % $271
 3.3 %
Commercial185
 188
 (1.6)% 181
 3.9 %
Industrial103
 104
 (1.0)% 97
 7.2 %
Mining38
 38
  % 34
 11.8 %
Public Authorities2
 2
  % 2
  %
Total by Customer Class609
 612
 (0.5)% 585
 4.6 %
LFCR Revenues12
 11
 9.1 % 2
 *
DSM Performance Bonus3
 2
 50.0 % 1
 100.0 %
Other Retail Margin Revenues5
 1
 *
 
 *
Total Retail Margin Revenues (Non-GAAP) (1)
629
 626
 0.5 % 588
 6.5 %
Fuel and Purchased Power Revenues344
 303
 13.5 % 300
 1.0 %
DSM and RES Surcharge Revenues49
 41
 19.5 % 46
 (10.9)%
Total Retail Revenues (GAAP)$1,022
 $970
 5.4 % $934
 3.9 %
Average Retail Margin Rate (Cents / kWh) (2)
         
Residential7.55
 7.51
 0.5 % 7.02
 7.0 %
Commercial8.71
 8.66
 0.6 % 8.28
 4.6 %
Industrial4.99
 4.96
 0.6 % 4.61
 7.6 %
Mining3.43
 3.34
 2.7 % 3.14
 6.4 %
Public Authorities5.61
 6.06
 (7.4)% 5.56
 9.0 %
Total Average Margin Rate by Customer Class6.73
 6.68
 0.7 % 6.30
 6.0 %
Total Average Retail Margin Rate (3)
6.95
 6.80
 2.2 % 6.31
 7.8 %
Average Fuel and Purchased Power Rate3.80
 3.31
 14.8 % 3.24
 2.2 %
Average DSM and RES Rate0.54
 0.48
 12.5 % 0.52
 (7.7)%
Total Average Retail Rate11.29
 10.59
 6.6 % 10.07
 5.2 %
Weather Data
 
 
 
 
Cooling Degree Days         
Year Ended December 31,1,576
 1,557
 1.2 % 1,631
 (4.5)%
10-Year Average1,520
 1,515
 *
 1,491
 *
Heating Degree Days         
Year Ended December 31,1,072
 930
 15.3 % 1,449
 (35.8)%
10-Year Average1,317
 1,335
 *
 1,404
 *
* Not meaningful
(1)
Retail Margin Revenues, a non-GAAP financial measure, should not be considered as an alternative to Total Retail Revenues, which is determined in accordance with GAAP. Retail Margin Revenues exclude: (i) revenues collected from retail customers that are

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directly offset by expenses recorded in other line items; and (ii) revenues collected from third parties that are unrelated to kWh sales to retail customers. We believe the change in Retail Margin Revenues between periods provides useful information because it demonstrates the underlying revenue trend and performance of our core utility business. Retail Margin Revenues represents the portion of retail operating revenues from kWh sales, LFCR Revenues, DSM Performance Bonus, and certain other retail margin revenues available to cover the non-fuel operating expenses of our core utility business.
(2)
Calculated on un-rounded data and may not correspond exactly to data shown in table.
(3)
Total Average Retail Margins Rates include revenues related to LFCR Revenues, DSM Performance Bonus, and Other Retail Margin Revenues included in the Total Retail Margin Revenues.
Retail Revenues were higher in 2015 compared with 2014 primarily due to the increase in the PPFAC rate and higher Retail Margin Revenues. Retail Margin Revenues were higher primarily due to higher LFCR revenues, DSM Performance Bonus, and Other Retail Margin Revenues related to adjustor mechanisms.
Retail Revenues were higher in 2014 compared with 2013 primarily due to higher Retail Margin Revenues and increased LFCR revenues. The increase in Retail Margin Revenues resulted from a non-fuel Base Rate increase effective July 1, 2013. These increases were partially offset by lower sales volume due to milder weather.
Wholesale Sales and Transmission Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Long-Term Wholesale Revenues$36

$28
 $26
Transmission Revenues27
 16
 15
Short-Term Wholesale Revenues104
 114
 92
Total Electric Wholesale Sales$167
 $158
 $133
Long-Term Wholesale Revenues increased by $8 million, or 29%, in 2015 compared with 2014 primarily due to new wholesale agreements partially offset by unfavorable wholesale market prices. Transmission Revenues increased by $11 million, or 69%, in 2015 compared with 2014 primarily due to a new long-term transmission agreement with UNS Electric related to Gila River and contract renewals resulting in favorable pricing.
Long-Term Wholesale Revenues increased by $2 million, or 8%, in 2014 compared with 2013 primarily due to favorable market prices for wholesale power. There were no significant changes in transmission revenues in 2014 compared to 2013.
The majority of revenues from short-term wholesale sales are related to ACC jurisdictional assets and are credited against the fuel and purchased power costs eligible for recovery in the PPFAC.
Other Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Springerville Units 3 and 4 Revenue (1)
$91
 $112
 $102
Other Revenue27
 29
 28
Total Other Revenue$118
 $141
 $130
(1)
Represents revenues and reimbursements from Tri-State, the lessee of Springerville Unit 3, and SRP, the owner of Springerville Unit 4, to TEP related to the operation of these plants.
In addition to reimbursements related to Springerville Units 3 and 4, TEP’s other revenues include inter-company revenues from its affiliates, UNS Gas, Inc., an indirect wholly-owned subsidiary of UNS Energy, (UNS Gas) and UNS Electric, for corporate services provided by TEP, and miscellaneous service-related revenues such as rent on power pole attachments, damage claims, and customer late fees. See Note 5 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding related party transactions.
There were no significant changes in Other Revenue in 2015 compared with 2014, as well as no significant changes in Other Revenue in 2014 compared with 2013.

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Operating Expenses
Generating Output and Fuel and Purchased Power Expense
TEP’s fuel and purchased power expense and energy resources for 2015, 2014, and 2013 are detailed below:
 Generation and Purchased Power (kWh) Fuel and Purchased Power Expense
(in millions)2015 2014 2013 2015 2014 2013
Coal-Fired Generation8,584
 9,271
 10,254
 $209
 $232
 $273
Gas-Fired Generation2,723
 1,210
 1,007
 91
 60
 46
Utility Owned Renewable Generation65
 48
 38
 
 
 
Reimbursed Fuel Expense for Springerville Units 3 and 4 (1)

 
 
 5
 5
 7
Total Generation11,372
 10,529
 11,299
 305
 297
 326
Total Purchased Power3,079
 3,195
 2,329
 125
 153
 112
Transmission and Other PPFAC Recoverable Costs
 
 
 25
 18
 12
Increase (Decrease) to Reflect PPFAC Recovery Treatment
 
 
 40
 (11) (12)
Total Generation and Purchased Power14,451
 13,724
 13,628
 $495
 $457
 $438
Less Line Losses and Company Use(719) (859) (885)      
Total Energy Sold13,732
 12,865
 12,743
      
(1)
Springerville Unit 3 and 4 Fuel Expense is reimbursed by Tri-State and SRP.
Fuel and Purchased Power Expense increased by $38 million, or 8%, in 2015 compared with 2014 primarily due to an increase in the PPFAC charge and additional generation and transmission costs associated with Gila River Unit 3. The increase was partially offset by favorable purchased power costs (see table below) and decreased coal generation at Springerville Unit 1 as a result of the lease expiration in January 2015.
Fuel and Purchased Power Expense increased by $19 million, or 4%, in 2014 compared with 2013 primarily due to the increase in purchased power volumes resulting from outages at Springerville and Sundt generating stations in 2014. The increase was partially offset by a decrease in generation expense as a result of the outages.
See the table below for information on the average fuel cost of generated and purchased kWh:
(cents per kWh)2015 2014 2013
Coal2.44
 2.50
 2.66
Gas3.35
 4.99
 4.57
Purchased Power4.05
 4.79
 4.83
All Sources3.31
 3.64
 3.54
Operations and Maintenance Expense
The table below summarizes the items included in Operations and Maintenance (O&M) expense:
(in millions)2015 2014 2013
Reimbursed Expenses - Springerville Units 3 and 4 (1)
$65
 $84
 $70
Reimbursed Expenses - Customer Funded Renewable Energy and
DSM Programs (2)
25
 23
 26
Other Operating and Maintenance Expense (3)
255
 272
 239
Total Operations and Maintenance Expense$345
 $379
 $335
(1)
Expenses related to Springerville Units 3 and 4 are reimbursed with corresponding amounts recorded in other revenue.
(2)
These expenses are being collected from customers and the corresponding amounts are recorded in retail revenue.
(3)
The Third-Party Owners' share of expenses related to Springerville Unit 1 is included in Other Operating and Maintenance Expense.

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Operating and Maintenance expenses decreased by $34 million, or 9%, in2015 compared with 2014. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, decreased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense decreased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014, partially offset by higher O&M related to Gila River, labor costs and outside services.
Operating and Maintenance expenses increased by$44 million, or 13%, in 2014 compared with 2013. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, increased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense increased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014.

FACTORS AFFECTING RESULTS OF OPERATIONS
2015 Rate Case
In November 2015, TEP filed a general rate case with the ACC to: (i) update and improve its rate design and tariffs to provide more accurate price signals and a more equitable allocation of its fixed costs to its customers; (ii) provide TEP with an opportunity to recover its full cost of service, including an appropriate return on its rate base investments; and (iii) enable TEP to continue to provide safe and reliable service. The rate application is based on a test year ended June 30, 2015. The filing requests that new rates be implemented by January 1, 2017.
The key provisions of the rate case include:
a Base Rate increase of $110 million, or 12%, compared with adjusted test year revenues;
a 7.34% return on original cost rate base of $2.1 billion;
a capital structure for rate making purposes of approximately 50% common equity and 50% long-term debt;
a cost of equity of 10.35% and an average cost of debt of 4.32%;
a request to apply excess depreciation reserves against the unrecovered net book value (NBV) of San Juan Unit 2 and the Sundt Coal Handling Facilities due to early retirement;
a request for authority to begin using the Third-Party Owners' portion of Springerville Unit 1 that is available to TEP for dispatch to serve retail customer needs and to recover the related operating costs through the PPFAC; and
rate design changes that would reduce the reliance on volumetric sales to recover fixed costs, and a new net metering tariff that would ensure that customers who install distributed generation pay an equitable price for their electric service.
TEP cannot predict the outcome of this proceeding or whether its rate request will be adopted by the ACC in whole or in part.
Generating Resources
At December 31, 2015, approximately 49% of TEP's generating capacity was fueled by coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating additional steps to reduce its dependency on coal generation.
In August 2015, TEP exhausted its existing coal supply at Unit 4 of the H. Wilson Sundt Generating Station (Sundt Unit 4). Currently, TEP is operating Sundt Unit 4 on natural gas as a primary fuel source.
TEP's ability to further reduce its coal-fired generating capacity will depend on several factors, including, but not limited to:
The impact of the Clean Power Plan on current coal-fired generating facilities; and
The ability to resolve Springerville Unit 1 legal proceedings relating to the Third-Party Owners.
See Part I, Item 1. Business, General for additional information regarding TEP's generating facilities.

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Springerville Unit 1
TEP leased Unit 1 of the Springerville Generating Station and an undivided one-half interest in certain Springerville Common Facilities (collectively Springerville Unit 1) under seven separate lease agreements (Springerville Unit 1 Leases) that were accounted for as capital leases. The leases expired in January 2015. At that time, TEP purchased a leased interest comprising 24.8% of Springerville Unit 1, representing 96 MW of capacity, for an aggregate purchase price of $46 million. Following this purchase, TEP owns 49.5% of Springerville Unit 1, or 192 MW of capacity.
The remaining 50.5% of Springerville Unit 1, or 195 MW of capacity, is owned by Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the Third-Party Owners’ generating output. TEP is obligated to operate the unit for the Third-Party Owners. Owner Trustees and Co-Trustees are obligated to compensate TEP for their pro rata share of expenses for the unit. TEP estimates the Third-Party Owners’ share of 2016 operations and maintenance expense will be $27 million and their estimated share of 2016 capital expenditures will be $9 million.
In April 2015, TEP filed a demand for arbitration seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expense and capital expenditures for Springerville Unit 1. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part I, Item 3. Legal Proceedings for additional information regarding the legal proceedings relating to the Third-Party Owners.
Potential Plant Retirements
TEP's 2014 Integrated Resource Plan (IRP), which was acknowledged by the ACC in April 2015, reflected plans to reduce its overall coal capacity by 492 MW (32% of TEP's existing coal fleet) by 2018. TEP's 2014 IRP included retiring certain coal-fired generating facilities at San Juan Generating Station (San Juan) and coal handling facilities at the H. Wilson Sundt Generating Station (Sundt) earlier than their current estimated useful lives. These facilities currently do not have the requisite emission control equipment to meet proposed Environmental Protection Agency (EPA) regulations. TEP plans to seek regulatory recovery for amounts that would not otherwise be recovered if and when any assets are retired. TEP plans to file a preliminary IRP in March 2016 and is required to file its next IRP by April 2017.
See Part I, Item 1. Business, Environmental Matters for additional information regarding the impact of environmental matters on plant operations.
Springerville Coal Handling Facilities Capital Lease Purchase
TEP previously leased interests in the coal handling facilities at the Springerville Generating Station (Springerville Coal Handling Facilities) under two separate lease agreements (Springerville Coal Handling Facilities Leases). The lease agreements had an initial term that expired in April 2015 and provided TEP the option to renew the leases or to purchase the leased interests at the aggregate fixed price of $120 million. In April 2015, TEP exercised its option to purchase the facilities.
Upon the expiration of the lease term, TEP purchased an 86.7% undivided ownership interest in the Springerville Coal Handling Facilities bringing TEP's total ownership interest to 100%. With the completion of the purchase, SRP was obligated to buy a 17.05% undivided interest in the Springerville Coal Handling Facilities from TEP for approximately $24 million. This transaction was completed in May 2015. Tri-State, is obligated to either: 1) buy a 17.05% undivided interest in the facilities for approximately $24 million or 2) continue to make payments to TEP for the use of the facilities. Tri-State has until April 2016 to exercise its purchase option.
Sales to Mining Customers
TEP's largest mining customer is taking initial steps to curtail production in 2016 due to the decline in commodity prices. TEP cannot predict the extent to which this customer will curtail production, how long commodity prices will remain low, or the

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total impact the prices will have on mining production in the future. At December 31, 2015, mining customers made up 8% of TEP's total electric sales.
The proposed Rosemont Copper Mine near Tucson, Arizona is in the permitting stage. If the Rosemont Copper Mine is constructed and reaches full production, it will become TEP's largest retail customer with an estimated load of approximately 85 to 120 MW.
Interest Rates
See Part II, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for information regarding interest rate risks and its impact on earnings.

LIQUIDITY AND CAPITAL RESOURCES
Liquidity
Cash flows may vary during the year, with cash flows from operations typically the lowest in the first quarter and highest in the third quarter due to TEP’s summer peaking load. As a result of the varied seasonal cash flow, we will use, as needed, our revolving credit facility to assist in funding business activities. We believe that we have sufficient liquidity under our revolving credit facilities to meet short-term working capital needs and to provide credit enhancement as necessary under energy procurement and hedging agreements.
Available Liquidity
(in millions)As of December 31, 2015
Cash and Cash Equivalents$56
Amount Available under Revolving Credit Facility (1)
250
Total Liquidity$306
(1)
TEP's revolving credit facility, which matures in 2020, provides for a $250 million revolving credit commitment with a LOC sublimit of $50 million.
Future Liquidity Requirements
We expect to meet all of our financial obligations and other anticipated cash outflows for the foreseeable future. These obligations and anticipated cash outflows include, but are not limited to, dividend payments, debt maturities, and obligations included in the Contractual Obligations and forecasted Capital Expenditures tablesbelow.
See Part III, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for additional information regarding TEP's market risks and Note 6of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's financing arrangements.
Summary of Cash Flow
The table below presents net cash provided by (used for) operating, investing and financing activities:
 Year Ended 
Increase
(Decrease)
 Year Ended 
Increase
(Decrease)
(in millions)2015 2014 Percent 2013 Percent
Operating Activities$365
 $314
 16.2 % $346
 (9.2)%
Investing Activities(503) (518) (2.9)% (260) 99.2 %
Financing Activities120
 253
 (52.6)% (141) 279.4 %
Net Increase (Decrease) in Cash(18) 49
 (136.7)% (55) 189.1 %
Cash, Beginning of Year74
 25
 196.0 % 80
 (68.8)%
Cash, End of Year$56
 $74
 (24.3)% $25
 196.0 %
Cash Flows for both 2015 and 2014 included unusually large capital expenditures. These capital requirements were met with a combination of equity contributions from UNS Energy and long-term borrowings as discussed in Financing Activities below.

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In 2015, we issued long-term debt and used the proceeds to repay revolving and term loans under our credit agreements and pay a portion of the purchase price for interests in the Springerville Coal Handling Facilities. In addition, we received an equity contribution from UNS Energy and used the proceeds to repay the outstanding balances under our revolving credit facilities and redeem long-term variable rate tax-exempt bonds which were called for redemption in June 2015.
In 2014, we received an equity contribution from UNS Energy and used the proceeds to pay for the purchase of both Gila River Unit 3 and Springerville Unit 1 leased assets.
Operating Activities
2015 compared with 2014
In 2015, net cash flows from operating activities increased by $51 million compared to 2014 primarily due to:
$39 million of higher cash receipts from retail and wholesale sales, net of fuel and purchased power costs paid driven primarily by an increase in the average PPFAC rate; and
$34 million in lower cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition.
The increase in net cash flows from operating activities was partially offset by $16 million of higher cash paid for pension and retiree funding.
2014 compared with 2013
In 2014, net cash flows from operating activities decreased by $32 million compared to 2013 primarily due to:
$27 million of higher cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition; and
$6 million of higher cash paid for capital lease interest.
Investing Activities
2015 compared with 2014
In 2015, net cash flows used for investing activities decreased by $15 million compared with 2014 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.
The decrease in net cash flows used for investing activities was partially offset by:
$120 million purchase, in April 2015, of an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities partially offset by $24 million of cash received for the sale, in May 2015, of a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
$46 million purchase, in January 2015, of an additional 24.8% undivided ownership interest in Springerville Unit 1 increasing our total ownership interest to 49.5%;
$11 million in lower cash receipts for contributions in aid of construction received; and
$10 million of higher capital expenditures to fund system reinforcement through replacements and betterments.
2014 compared with 2013
In 2014, net cash flows used for investing activities increased by $258 million compared with 2013 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3;
$71 million of higher capital expenditures to fund the construction of new solar projects and improvements to our generating facilities; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.

27



Financing Activities
2015 compared with 2014
In 2015, net cash flows from financing activities decreased by $133 million compared with 2014 primarily due to:
$209 million in higher cash payments due to the purchase of $130 million in fixed rate tax-exempt long-term debt in January 2015, and the retirement of $79 million in variable rate tax-exempt bonds in August 2015;
$170 million in lower proceeds borrowed and higher repayments under TEP's revolving credit facilities;
$45 million in lower cash proceeds from UNS Energy's equity contributions; and
$10 million in higher cash dividend payments.
The decrease in net cash flows from financing activities was partially offset by:
$152 million in lower cash payments due to the expiration of capital lease obligations in 2015; and
$150 million in higher cash proceeds from the issuance of long-term debt, in February 2015.
2014 compared with 2013
In 2014, net cash flows from financing activities increased by $394 million compared with 2013 primarily due to:
$225 million in higher cash proceeds from UNS Energy's equity contributions made to complete the purchases for interest in Gila River Unit 3 and Springerville Unit 1;
$149 million in higher cash proceeds from the issuance of long-term debt; and
$85 million in higher cash borrowings (net of repayments) under TEP's revolving credit facilities.
The increase in net cash flows from financing activities was partially offset by $66 million in higher cash payments of capital lease obligations.
External Sources of Liquidity
Short-Term Investments
TEP’s short-term investment policy governs the investment of excess cash balances. We regularly review and update this policy in response to market conditions. At December 31, 2015, TEP's short-term investments included highly-rated and liquid money market funds.
Access to Revolving Credit Facilities
We have access to working capital through a revolving credit agreement with lenders. The 2015 Credit Agreement provides for a $250 million revolving credit commitment and LOC facility, due in October 2020. The LOC sublimit is $50 million. TEP expects that amounts borrowed under the credit agreement will be used for working capital and other general corporate purposes and that LOCs will be issued from time to time to support energy procurement and hedging transactions. No amounts were drawn under the 2015 Credit Agreement at December 31, 2015.
In June 2015, the 2014 Credit Agreement was terminated. In October 2015, the 2010 Credit Agreement was terminated.
For details on TEP's credit facilities see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Debt Financing
We use debt financing to lower our overall cost of capital. We are exposed to adverse changes in interest rates to the extent that we rely on variable rate financing. Our cost of capital is also affected by our credit ratings
In April 2015, we filed a financing application with the ACC. The application requests extending and expanding the existing financing authority to TEP by: (i) extending authority from December 2016 to December 2020; (ii) increasing the outstanding long-term debt limitation from $1.7 billion to $2.2 billion; (iii) allowing parent equity contributions of up to $400 million; and (iv) extending current interest rate hedging authority. The ACC issued an order granting such authority in January 2016.

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As discussed in Part I, Item 1A. Risk Factors of this Form 10-K, we may need to redeem or defease certain tax-exempt bonds outstanding. To the extent that is required, we would need to issue new taxable debt or enter into a new bank financing.
We have no new financing planned for 2016. TEP has, from time to time, refinanced or repurchased portions of its outstanding debt before scheduled maturity. Depending on market conditions, TEP may refinance other debt issuances or make additional debt repurchases in the future. For details on changes to or maturities on long-term debt, see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Debt Restrictive Covenants
The 2015 Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement contain pricing based on TEP’s credit ratings. A change in TEP’s credit ratings can cause an increase or decrease in the amount of interest TEP pays on its borrowings, and the amount of fees it pays for its LOCs and unused commitments. Also, under certain agreements, should TEP fail to maintain compliance with covenants, lenders could accelerate the maturity of all amounts outstanding. At December 31, 2015, TEP was in compliance with these covenants.
TEP conducts its wholesale marketing and risk management activities under certain master agreements whereby TEP may be required to post credit enhancements in the form of cash or a LOC due to exposures exceeding unsecured credit limits provided to TEP, changes in contract values, a change in TEP’s credit ratings, or if there has been a material change in TEP’s creditworthiness. As of December 31, 2015, TEP had posted less than $1 million in LOCs for credit enhancement with wholesale counterparties.
We do not have any provisions in any of our debt or lease agreements that would cause an event of default or cause amounts to become due and payable in the event of a credit rating downgrade.
Credit Ratings
Our credit ratings affect our access to capital markets and supplemental bank financing. At December 31, 2015, TEP’s credit ratings for senior unsecured debt were A3 from Moody’s and BBB+ from both Standard & Poor’s and Fitch. As of February 2016, at TEP's request for commercial reasons, Fitch withdrew its rating on TEP.
TEP's credit ratings are dependent on a number of factors, both quantitative and qualitative, and are subject to change at any time. The disclosure of these credit ratings is not a recommendation to buy, sell, or hold TEP securities. Each rating should be evaluated independently of any other ratings.
Dividends
TEP declared and paid $50 million in dividends to UNS Energy in 2015 and $40 million in 2014 and 2013.
The ACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and reported to the ACC annually beginning on April 1, 2016. As of December 31, 2015, TEP had not yet reached the 50 percent of total capital and was therefore still restricted by the condition contained in the ACC's approval order.
Capital Expenditures
TEP's routine capital expenditures include funds used for system reinforcement, replacements and betterments, and costs to comply with environmental rules and regulations. In 2015, total capital expenditures of $500 million, included the purchase of an undivided ownership interest in Springerville Unit 1 and the remaining ownership interest in the Springerville Coal Handling facilities. In 2014, total capital expenditures of $507 million, included the purchase of interest in Gila River Unit 3 and an undivided ownership interest in Springerville Unit 1. Construction for a new 500-kilovolt (kV) transmission line in Pinal County that began in December 2014 and concluded in late 2015, totaled $79 million.

29



With the exception of 2017, we expect capital requirements to remain stable from 2016 through 2020. TEP's forecasted capital expenditures are summarized below:
(in millions)2016 2017 2018 2019 2020
Generation Facilities:         
Environmental Compliance$39
 $27
 $11
 $2
 $2
Renewable Energy27
 27
 27
 27
 27
Springerville Common Lease Purchase
 38
 
 
 
Other Generation Facilities34
 82
 31
 36
 39
Total Generation Facilities100
 174
 69
 65
 68
Transmission and Distribution122
 112
 159
 154
 163
General and Other (1)
52
 46
 56
 57
 54
Total Capital Expenditures$274
 $332
 $284
 $276
 $285
(1)
General and Other primarily includes cost for information technology as well as fleet, facilities and communication equipment.
These estimates are subject to continuing review and adjustment. Actual capital expenditures may differ from these estimates due to changes in business conditions, construction schedules, environmental requirements, state or federal regulations and other factors. We expect to pay for forecasted capital expenditures with cash on hand, internally generated funds, and short-term revolver borrowings.
Contractual Obligations
The following chart displays TEP’s contractual obligations by maturity and by type of obligation as of December 31, 2015:
   Payments Due by Period
(in millions)Total Less than 1 Year 1-3 Years 3-5 Years More than 5 Years
Long-Term Debt
        
Principal (1)
$1,466
 $
 $100
 $117
 $1,249
Interest (2)
769
 59
 120
 116
 474
Capital Lease Obligations (3)
77
 17
 30
 30
 
Operating Leases: (4)

        
Land Easements and Rights-of-Way82
 1
 2
 2
 77
Operating Leases Other9
 1
 2
 2
 4
Purchase Obligations:
        
Fuel, Including Transportation (5)(6)
580
 78
 125
 90
 287
Purchased Power28
 28
 
 
 
Transmission38
 6
 12
 7
 13
Renewable Purchase Power Agreements (7)(8)
1,054
 61
 122
 121
 750
RES Performance-Based Incentives (9)
107
 8
 16
 16
 67
Acquisition of Springerville Common Facilities (10)
106
 
 38
 
 68
Other Long-Term Liabilities: (11) (12)

        
Restricted and Performance-Based Stock Units2
 
 2
 
 
Pension & Other Post Retirement Obligations (13)
77
 16
 11
 13
 37
Total Contractual Obligations$4,395
 $275
 $580
 $514
 $3,026
(1)
$37 million of TEP’s variable rate bonds are backed by an LOC issued pursuant to the 2010 Reimbursement Agreement, which expires in December 2019. Although the variable rate bond matures in 2032, the above table reflects a redemption or repurchase of such bond in 2019 as though the LOC terminates without replacement upon expiration of the 2010 Reimbursement Agreement. TEP's 2013 tax-exempt variable rate IDRBs, which have an aggregate principal amount of $100 million and mature in 2032, are subject to mandatory tender for purchase in 2018. Total long-term debt is not reduced by $11 million of related unamortized debt issuance costs or $3 million of unamortized original issue discount.

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(2)
Excludes interest on revolving credit facilities and includes interest on TEP's 2013 tax-exempt IDRBs through the end of the current five-year term.
(3)
Effective with commercial operation of Springerville Unit 3 in July 2006 and Unit 4 in December 2009, Tri-State and SRP began reimbursing TEP for various operating costs related to the common facilities on an ongoing basis. The common facilities included assets leased by TEP under the Springerville Common and Springerville Coal Handling Facilities Leases. Upon expiration of the Springerville Coal Handling Lease in April 2015, TEP purchased the interests in those assets. SRP then purchased an undivided interest in those coal handling assets from TEP. Tri-State and SRP each continue to reimburse TEP for their shares of common assets owned or leased by TEP. TEP was reimbursed for $11 million of operation costs in 2015, and absent a purchase of an interest in the coal handling facilities by Tri-State, will be reimbursed $10 million of operation costs in 2016. Capital Lease Obligations do not reflect any reduction associated with this reimbursement. Our capital lease obligation balances decline over time as scheduled capital lease payments are made by TEP.
(4)
TEP's operating lease expense is primarily for rail cars, office facilities, land easements, and rights-of-way with varying terms, provisions, and expiration dates.
(5)
Contemporaneously with the sale of SJCC's stock in January 2016, the existing coal sale agreement terminated and a new Coal Supply Agreement (CSA) became effective. The new CSA is between SJCC and PNM and continues through June 30, 2022. TEP is not a party to the new CSA, but has minimum purchase obligations under restructured ownership agreements at San Juan. Estimated future payments, not included in the table above, are $21 million in 2016, $23 million in 2017, $24 million in 2018 and 2019, $23 million in 2020, and $22 million through the end of the contract.
(6)
Excludes TEP’s liability for final environmental reclamation at the coal mines which supply the Navajo, San Juan and Four Corners generating stations as the timing of payment has not been determined. See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP’s share of reclamation costs.
(7)
TEP enters into long-term renewable power purchase agreements which require TEP to purchase 100% of certain renewable energy generation facilities output once commercial operation status is achieved. While TEP is not required to make payments under these contracts if power is not delivered, the table above includes estimated future payments based on expected power deliveries.
(8)
In February 2016, a facility achieved commercial operation status. The related contract expires in 2036. Estimated future payments, not included in the table above, are $3 million in each of 2016 through 2020 and $43 million through the end of the contract.
(9)
TEP has entered into REC purchase agreements to purchase the environmental attributes from retail customers with solar installations. Payments for the RECs are termed Performance-Based Incentives (PBIs) and are paid in contractually agreed upon intervals (usually quarterly) based on metered renewable energy production. PBIs are recoverable through the RES tariff. See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's RES tariff.
(10)
The Springerville Common Facilities Leases have an initial term to December 2017 for one lease and January 2021 for the other two leases, subject to optional renewal periods of two or more years through 2025. Instead of extending the leases, TEP may exercise its fixed-price purchase options.
(11)
Excludes asset retirement obligations of $33 million expected to occur through 2066.
(12)
Excludes unrecognized tax benefits of $5 million. At this time we are unable to make a reasonably reliable estimate of the timing of payments in individual years in connection with these tax liabilities.
(13)
These obligations represent TEP’s expected contributions to pension plans in 2016, expected benefit payments for its unfunded Supplemental Executive Retirement Plan (SERP), and expected retiree benefit costs to cover medical and life insurance claims as determined by the plans’ actuaries. Due to the significant impact that returns on plan assets and changes in discount rates might have on payment obligation amounts, other contributions are excluded beyond 2016.
We expect to pay for forecasted capital expenditures with cash on hand, internally generated funds, and short-term revolver borrowings.
Off Balance Sheet Arrangements
Other than the unrecorded contractual obligations in the table above, we do not have any arrangements or relationships with entities that are not consolidated into the financial statements.
Income Tax Position
Prior year tax legislation and the Consolidated Appropriations Act of 2016, include provisions that make qualified property placed in service between 2010 and 2019 eligible for bonus depreciation for tax purposes. In addition, the IRS issued new guidance related to the treatment of expenditures to maintain, replace, or improve property. These provisions are an acceleration of tax benefits TEP otherwise would have received over 20 years and have created net operating loss

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carryforwards that can be used to offset future taxable income. As a result, TEP did not pay any federal or state income taxes in 2015 and does not expect to make any payments until 2020.
Environmental Matters
The EPA regulates the amount of sulfur dioxide (SO2), nitrogen oxide (NOx), carbon dioxide (CO2), particulate matter, mercury and other by-products produced by power plants. TEP may incur added costs to comply with future changes in federal and state environmental laws, regulations, and permit requirements at its power plants. Environmental laws and regulations are subject to a range of interpretations, which may ultimately be resolved by the courts. Because these laws and regulations continue to evolve, TEP is unable to predict the impact of the changing laws and regulations on its operations and consolidated financial results. Complying with these changes may reduce operating efficiency. TEP capitalized $33 million in 2015, $11 million in 2014, and $5 million in 2013 in costs to comply with environmental rules and regulations. In addition, we recorded O&M expenses of $6 million in 2015, $5 million in 2014, and $8 million in 2013. TEP expects to recover the cost of environmental compliance from its ratepayers.
Hazardous Air Pollutant Requirements
The Clean Air Act requires the EPA to develop emission limit standards for hazardous air pollutants that reflect the maximum achievable control technology. In February 2012, the EPA issued final rules to set the standards for the control of mercury emissions and other hazardous air pollutants from power plants.
Navajo
Based on the EPA’s standards, Navajo may require mercuryEPA's final Mercury and particulate matterAir Toxics Standards (MATS) rules, additional emission control equipment would have been required by April 2015. TEP’s shareTEP, as operator of the estimated capital cost of this equipment is less than $1 million for mercury controlSpringerville and about $43 million ifSundt generating stations, and the installation of baghouses to control particulates is necessary. The operatoroperators of Navajo is currently analyzing the need for baghouses under various regulatory scenarios, which will be affected by final Best Available Retrofit Technology (BART) rules when issued. TEP expects its share of the annual operating costs for mercury control and baghouses to be less than $1 million each.
San Juan
TEP expects San Juan’s current emission controls to be adequateFour Corners received extensions until April 2016 to comply with the EPA’s final standards.MATS rules.
Four CornersIn June 2015, the U.S. Supreme Court reversed and remanded the D.C. Circuit Court of Appeals decision in Michigan v. EPA to uphold the MATS rules requiring power plants to control mercury and other emissions. The Supreme Court held that the EPA did not adequately consider “cost” before determining that MATS was “appropriate and necessary.” The D.C. Circuit Court of Appeals remanded the rules to the EPA for further consideration.
Based onAt this time, despite the EPA’s final standards, Four Corners may requireU.S. Supreme Court ruling, the MATS rules remain in force and effect. TEP will proceed with its planned MATS compliance activity at each of our facilities. Additionally, Arizona has an Arizona-specific mercury emission control equipment by 2015. rule in place that will become effective and applicable to our Arizona facilities in the event the Federal rule is struck down. Our compliance strategy is intended to ensure compliance with both the Federal and the State rule, as applicable.
TEP's share of the estimated capital cost of this equipment is less than $1 million. TEP expects its share of the annual operating cost of the mercury emission control equipmentcosts to be less than $1 million.comply with the MATS rules includes the following:
Springerville Generating Station
(in millions)Navajo 
Springerville(1)
Capital Expenditures$1
 $5
Annual O&M Expenses$1
 $1
Compliance Year2016 2016
Based on the EPA’s final standards, Springerville Generating Station (Springerville) may require mercury emission control equipment by 2015. The estimated capital cost of this equipment for Springerville Units 1 and 2 is about $5 million. TEP expects the annual operating cost of the mercury emission control equipment to be about $3 million. TEP will own 49.5% of Springerville Unit 1 upon close of the lease option purchases by early 2015; after the completion of such purchases, 50.5% of environmental costs attributed to Springerville Unit 1 will be reimbursed by third party owners.
Sundt Generating Station
(1)
Total capital expenditures and annual O&M expenses represent amounts for Springerville Units 1 and 2, with estimated costs split equally between the two units. In January 2015, TEP completed the purchase of 24.8% of Springerville Unit 1, bringing its total ownership interest to 49.5%. With the completion of the purchase, the Third-Party Owners are responsible for 50.5% of environmental costs attributable to Springerville Unit 1. TEP will continue to be responsible for 100% of environmental costs attributable to Springerville Unit 2.
TEP expects the final EPA standards will have little effect onno additional capital expenditures or O&M expenses will be incurred to comply with the MATS rules at Four Corners, Sundt, and San Juan Generating Station (Sundt).Stations.
Regional Haze Rules
The EPA's Regional Haze Rules require emission controls known as BART for certain industrial facilities emitting air pollutants that reduce visibility in national parks and wilderness areas. The rules callrule calls for all states to establish goals and emission reduction strategies for improving visibility. States must submit these goals and strategies to the EPA for approval. BART applies to plants built between August 1962 and August 1977. Because Navajo and Four Corners are located on land leased from the Navajo Indian Reservation,Nation, they are not subject to state oversight; the EPA oversees regional haze planning for these power plants.
In the western U.S., Regional Haze BART determinations have focused on controls for NOx, often resulting in a requirement to install Selective Catalytic Reduction (SCR). Complying with the EPA’s BART findings,rule, and with other future environmental rules, may make it economically impractical to continue operating all or a portion of the Navajo, San Juan, and Four Corners power plants or for individual owners to continue to participate in these power plants. TEP cannot predict the ultimate outcome of these matters.

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Navajo
In January 2013, the EPA proposed a BART determination that would require the installation of Selective Catalytic Reduction (SCR) technology on all three units at Navajo by 2023. In July 2013, SRP, along with other stakeholders including impacted government agencies, environmental organizations, and tribal representatives, submitted an agreement to the EPA that would achieve greater NOx emission reductions than the EPA's proposed BART rule. In September 2013, the EPA issued a supplemental proposal incorporating the provisions of the agreement as a better-than-BART alternative.
Among other things, the agreement calls for the shut-down of one unit or an equivalent reduction in emissions by 2020. The shutdown of one unit will not impact the total amount of energy delivered to TEP from Navajo. Additionally, the remaining Navajo participants would be required to install SCR or an equivalent technology on the remaining two units by 2030. As part of the agreement, the current owners have committed to cease their operation of conventional coal-fired generation at Navajo no later than December 2044. The Navajo Nation can continue operation after 2044 at its election. If SCR technology is ultimately implemented at Navajo, TEP estimates its share of the capital cost will be $42 million. Also, the installation of SCR technology at Navajo could increase the power plant's particulate emissions which may require that baghouses be installed. TEP estimates that its share of the capital expenditure for baghouses would be about $43 million. TEP's share of annual operating costs for SCR and baghouses is estimated at less than $1 million each. The EPA could issue their decision as early as mid-2014.
San Juan
In August 2011, the EPA issued a Federal Implementation Plan (FIP) establishing new emission limits for air pollutants at San Juan. These requirements are more stringent than those proposed by the State of New Mexico. The FIP requires the installation of SCR technology with sorbent injection on all four units to reduce NOx and control sulfuric acid emissions by September 2016. TEP estimates its share of the cost to install SCR technology with sorbent injection to be between $180 million and $200 million. TEP expects its share of the annual operating costs for SCR technology to be approximately $6 million.
In 2011, Public Service Company of New Mexico (PNM) filed a petition for review of, and a motion to stay, the FIP with the United States Court of Appeals for the Tenth Circuit (Tenth Circuit). In addition, the operator filed a request for reconsideration of the rule with the EPA and a request to stay the effectiveness of the rule pending the EPA's reconsideration and review by the Tenth Circuit. The State of New Mexico filed similar motions with the Tenth Circuit and the EPA. Several environmental groups were granted permission to join in opposition to PNM's petition to review in the Tenth Circuit. In addition, WildEarth Guardians filed a separate appeal against the EPA challenging the FIP's five-year implementation schedule. PNM was granted permission to join in opposition to that appeal. In March 2012, the Tenth Circuit denied PNM's and the State of New Mexico's motion for stay. Oral argument on the appeal was heard in October 2012.
In February 2013, the State of New Mexico, the EPA, and PNM signed a non-binding agreement (Settlement Agreement) that outlines an alternative to the FIP. The terms of the Settlement Agreement include: the retirement of San Juan Units 2 and 3 by December 31, 2017; the replacement by PNM of those units with non-coal generation sources; and the installation of Selective Non-Catalytic Reduction technology (SNCR) on San Juan Units 1 and 4 by January 2016 or later depending on the timing of EPA approvals. The New Mexico Environmental Department (NMED) prepared a revision to the regional haze State Implementation Plan (SIP) incorporating the provisions of the Settlement Agreement, and in September 2013, the New Mexico Environmental Improvement Board approved the SIP revision. The SIP revision now awaits final EPA approval. The EPA is expected to issue a final BART determination in the second or third quarter of 2014.  TEP estimates its share of the cost to install SNCR technology on San Juan Unit 1 would be approximately $35 million. TEP's share of incremental annual operating costs for SNCR is estimated at $1 million. TEP owns 340 MW, or 50%, of San Juan Units 1 and 2. If San Juan Unit 2 is retired, TEP's coal-fired generating capacity would be reduced by 170 MW.
In connection with the implementation of the SIP revision and the retirement of San Juan Units 2 and 3, some of the San Juan owner participants (Participants) have expressed a desire to exit their ownership in the plant. As a result, the Participants are attempting to negotiate a restructuring of the ownership in San Juan, as well as addressing the obligations of the exiting Participants for plant decommissioning, mine reclamation, environmental matters, and certain ongoing operating costs, among other items. The Participants have engaged a mediator to assist in facilitating the resolution of these matters among the owners. The owners of the affected units also may seek approvals of their utility commissions or governing boards. We are unable to predict the outcome of the negotiations and mediation.

On October 17, 2013, the Tenth Circuit ruled on a motion filed by PNM for abatement of the pending petitions for review and seeking deferral of briefing on a simultaneously-filed motion to stay the FIP. The Tenth Circuit placed the pending petitions for

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review in abeyance and set a schedule for the parties to file status reports. The court ruled that, if at any time the Settlement Agreement is not implemented as contemplated, any party to the litigation may file a motion seeking to lift the abatement.
At December 31, 2013, the book value of TEP's share of San Juan Unit 2 was $113 million. If Unit 2 is retired early, we expect to request ACC approval to recover, over a reasonable time period, all costs associated with the early closure of the unit. TEP cannot predict the ultimate outcome of this matter.
Four Corners
In 2012, the EPA finalized the regional haze FIP for Four Corners. The final FIP requires SCR technology to be installed on all five units by 2017. In December 2013, APS (the operator) decided to shut down Units 1-3 and install SCRs on Units 4 and 5. Under this scenario, the installation of SCR technology can be delayed until July 2018. TEP's estimated share of the capital costs to install SCR technology on Units 4 and 5 is approximately $35 million. TEP's share of incremental annual operating costs for SCR is estimated at $2 million.
Springerville
The BART provisions of the Regional Haze Rules requiring emission control upgrades do not apply to Springerville Units 1 and 2 since they were constructed in the 1980s, which is after the time frame as designated by the rules. Other provisions of the

32



Regional Haze RuleRules requiring further emission reductionreductions are not likely to impact Springerville operations until after 2018. TEP cannot predict the ultimate outcome of these matters.
SundtTEP's estimated NOx emissions control costs involved in meeting these rules are:
(in millions)Navajo San Juan Four Corners Sundt
Capital Expenditures$28
 $12
 $44
 $12
Annual O&M Expenses$1
 $1
 $2
 $6
Compliance Year2030 2016 2018 2017
Navajo
In July 2013,August 2014, the EPA rejectedpublished a final Federal Implementation Plan (FIP) which provides that one unit at Navajo will be shut down by 2020, SCR (or the Arizona state implementation plan determinationequivalent) will be installed on the remaining two units by 2030, and conventional coal-fired generation will cease by December 2044. The final BART rule includes options that Sundt Unitaccommodate potential ownership changes at the plant. The plant has until December 2019 to notify the EPA of how it will comply with the FIP.
San Juan
In October 2014, the EPA published a final rule approving a revised State Implementation Plan (SIP) covering BART requirements for San Juan, which includes the closure of Units 2 and 3 by December 2017 and the installation of Selective Non-Catalytic Reduction (SNCR) on Units 1 and 4 is not subject toby February 2016. TEP owns 50% of Units 1 and 2 at San Juan. The SIP approval references a New Source Review permit issued by the BART provisions of the Regional Haze Rule and developed a timeline to issue a federal implementation plan for emissions sources including Sundt Unit 4. While TEP does not agree that Sundt Unit 4 is subject to BART, it submitted a better-than-BART proposalNew Mexico Environment Department in November 2013 which, calledamong other things, calls for balanced draft upgrades on San Juan Unit 1 to reduce particulate matter emissions. PNM, the eliminationoperator of coalSan Juan, is currently installing SNCR. Balanced draft modifications to San Juan Unit 1were completed in June 2015. TEP’s share of the balanced draft upgrades was approximately $22 million. In December 2015, PNM obtained New Mexico Public Regulation Commission approval to shut down Units 2 and 3 at San Juan.
At December 31, 2015, the net book value of TEP's share in San Juan Unit 2, including construction work in progress, was $104 million. Consistent with the 2013 Rate Order, TEP has requested authorization from the ACC to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case.
Four Corners
In December 2013, APS, on behalf of the co-owners of Four Corners, notified the EPA that they have chosen an alternative BART compliance strategy; as a fuel source at Sundtresult, APS closed Units 1, 2, and 3 in December 2013 and agreed to the installation of SCR on Units 4 and 5 by 2017. July 2018. TEP owns 7% of Four Corners Units 4 and 5.
Sundt
In JanuaryJune 2014, the EPA issued a BART proposalfinal rule that would require TEP to eithereither: (i) install, by mid-2017, SNCR and other equipmentdry sorbent injection if Sundt Unit 4 of the H. Wilson Sundt Generating Station (Sundt) continues to use coal as a fuel source,source; or (ii) permanently eliminate coal as a fuel source as a better-than-BART alternative by the end of 2017. TEP estimates that the cost to install SNCR and other necessary equipment would be approximately $12 million, and the incremental annual operating costs would be $5 million to $6 million. Under the proposal,rule, TEP would beis required to notify the EPA of its decision by July 31, 2015. The EPA is expected to issue a final BART determination by July 2014. March 2017.
At December 31, 2013,2015, the net book value of the Sundt coal handling facilities was $27$16 million. IfIn August 2015, TEP exhausted its existing coal supply at Sundt and has been operating Sundt with natural gas as a primary fuel source. TEP expects to retire the Sundt coal handling facilities earlier than expected, and has requested to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case. The estimated NOx emissions control costs in the table above will not be expended if Sundt's coal handling facilities are retired early, we expect to request ACC approval to recover, over a reasonable time period, all the remaining costs of the coal handling facilities.early.

Greenhouse Gas RegulationRenewable Energy Resources
In June 2013, President Obama directedThe ACC’s Renewable Energy Standard (RES) requires TEP, and other affected utilities, to increase their use of renewable energy each year until it represents at least 15% of their total annual retail energy requirements by 2025, with distributed generation accounting for 30% of the EPA to move forward with carbon emission regulationsannual renewable energy requirement. Affected utilities must file an annual RES implementation plan for both newreview and existing fossil-fueled power plants.
In January 2014,approval by the EPA published a re-proposed rule for new power plants. UNS Energy does not anticipate that a final rule related to new fossil-fueled power plant sources will have a significant impact on operations.
For existing power plants, the President ordered the EPA to:
propose carbon emission standards by June 1, 2014;
finalize those standards by June 1, 2015; and
require states to submit their implementationACC. TEP plans to meet this requirement through a combination of owned resources and Power Purchase Agreements (PPAs). See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Rates and Regulations below for additional information regarding RES.
Owned Renewable Resources
As of December 31, 2015, TEP owned 46 MW of photovoltaic (PV) solar generating capacity. In 2016, TEP plans to complete an additional solar project adding 5 MW of PV solar generating capacity. The solar generating facilities are located on properties held under easements and leases. In December 2015, TEP also acquired a 5 MW concentrated solar project which does not increase capacity but displaces the standardsequivalent amount of steam produced by June 30, 2016.burning fossil fuel.
UNS Energy will continueRenewable Power Purchase Agreements
As of December 31, 2015, TEP has renewable PPAs for 175 MW of capacity measured in direct current (DC) from solar resources, 80 MW of capacity measured in alternating current (AC) from wind resources and 4 MW of capacity measured in AC from a landfill gas generation plant. The solar PPAs contain options that allow TEP to workpurchase all or part of the related project at a future period.
Power Purchases
TEP purchases power from other utilities and power marketers. TEP may enter into contracts to purchase: (i) energy under long-term contracts to serve retail load and long-term wholesale contracts; (ii) capacity or energy during periods of planned outages or for peak summer load conditions; and (iii) energy for resale to certain wholesale customers under load and resource management agreements.
TEP typically uses generation from its gas-fired units, supplemented by power purchases, to meet the summer peak demands of its retail customers. Some of these power purchases are price-indexed to natural gas. Due to its increasing seasonal gas and purchased power usage, TEP hedges a portion of its total natural gas exposure with federal and state regulatory agencies to promote compliance flexibilityfixed price contracts for a maximum of three years. TEP also purchases energy in the rules impacting existing fossil-fuel fired power plants. We cannot predict the ultimate outcome of these matters.daily and hourly markets to meet higher than anticipated demands, to cover unplanned generation outages, or when doing so is more economical than generating its own energy.

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The table below providesTEP is a summarymember of a regional reserve-sharing organization and has reliability and power sharing relationships with other utilities. These relationships allow TEP to call upon other utilities during emergencies, such as plant outages and system disturbances, and reduce the estimated impactamount of pending environmental regulations on TEP's annual O&M expense and capital expenditures.reserves TEP is required to carry.
PEAK DEMAND AND FUTURE RESOURCES
Peak Demand
Generating Facility 

Estimated
 Annual O&M Expense
 

Estimated
Capital Expenditures
 


Regulation
(Compliance Date)
Upgrades
  Millions of Dollars   
Springerville Units 1 & 2(1)
 $3
 $5
 MATS (2015)Mercury Controls
San Juan Unit 1 1 - 6
 35 - 200
 Regional Haze/BART (2016)
SNCRs or SCRs  
Navajo Units 1-3 3
 86
 
MATS (2015)
Regional Haze/BART (2030)
Mercury Controls; SCRs; Baghouses
Four Corners Units 4 & 5 3
 36
 
MATS (2015)
Regional Haze/BART (2018)
Mercury Controls; SCRs
Sundt Unit 4 5 - 6
 12
 Regional Haze (2017)SNCR
(in MW)2015 2014 2013 2012 2011
Retail Customers2,222
 2,218
 2,230
 2,290
 2,334
Firm Sales to Other Utilities638
 673
 484
 286
 322
Coincident Peak Demand (A)2,860
 2,891
 2,714
 2,576
 2,656
          
Total Generating Resources2,452
 2,240
 2,240
 2,267
 2,262
Other Resources (1)
913
 932
 775
 683
 1,009
Total TEP Resources (B)3,365
 3,172
 3,015
 2,950
 3,271
Total Margin (B) – (A)505
 281
 301
 374
 615
Reserve Margin (% of Coincident Peak Demand)18% 10% 11% 15% 23%
(1)
TEP will own 49.5% of Springerville Unit 1 upon closeOther Resources include firm power purchases and interruptible retail and wholesale loads.
The chart above shows the relationship over a five-year period between peak demand and energy resources. Total margin is the difference between total energy resources and coincident peak demand, and the reserve margin is the ratio of margin to coincident peak demand. The reserve margin in 2015 was in compliance with reliability criteria set forth by the Western Electricity Coordinating Council, a regional council of North American Reliability Corporation (NERC).
Peak demand occurs during the summer months due to the cooling requirements of retail customers. Retail peak demand varies from year-to-year due to weather, economic conditions, and other factors. Retail peak demand has primarily declined over the five-year period due to weak economic conditions and the implementation of energy efficiency programs and distributed generation.
Forecasted retail peak demand for 2016 is 2,109 MW compared with actual peak demand of 2,222 MW in 2015. TEP’s 2016 estimated retail peak demand is based on weather patterns observed over a 10-year period and other factors, including estimates of customer usage and planned curtailment of mining customers. TEP believes existing generation capacity and PPAs are sufficient to meet expected demand in 2016 and established reserve margin criteria.
Future Resources
At December 31, 2015, approximately 49% of TEP's generating capacity was fueled by coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating additional steps to reduce its dependency on coal generation while still meeting its peak load requirements. In August 2015, TEP exhausted its existing coal supply at Unit 4 of the H. Wilson Sundt Generating Station (Sundt Unit 4). TEP expects to continue operating Sundt Unit 4 on natural gas as a primary fuel source.
See Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Factors Affecting Results of Operations for additional information regarding TEP's generating facilities.

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FUEL SUPPLY
Fuel and Purchased Power Summary
Resource information is provided below:
 Average Cost per kWh (cents per kWh) Percentage of Total kWh Resources
 2015 2014 2013 2015 2014 2013
Coal2.44
 2.50
 2.66
 60% 68% 75%
Gas3.35
 4.99
 4.57
 19% 9% 8%
Purchased Power4.05
 4.79
 4.83
 21% 23% 17%
All Sources3.31
 3.64
 3.54
 100% 100% 100%
Coal
The coal used for electric generation is low-sulfur, bituminous or sub-bituminous coal from mines in Arizona and New Mexico. The table below provides information on the existing coal contracts that supply our generating stations. The average cost of coal per million metric British thermal unit (MMBtu), including transportation, was $2.34 in 2015, $2.43 in 2014, and $2.57 in 2013.
Station Coal Supplier 2015 Coal
Consumption
(tons in 000s)
 
Contract
Expiration
 
Avg.
Sulfur
Content
 Coal Obtained From
Springerville (1)
 Peabody CoalSales 2,676 2020 1.0% Lee Ranch Mine/El Segundo Mine
Four Corners (2)
 BHP Billiton 378 2031 0.7% Navajo Mine
San Juan (3)
 San Juan Coal Co. 1,079 2022 0.8% San Juan Mine
Navajo Peabody CoalSales 510 2019 0.6% Kayenta Mine
(1)
Peabody has a pending sale of the lease option purchases by early 2015; afterLee Ranch Mine/El Segundo Mine to Bowie Resources Partners.
(2)
Beginning in July 2016 through June 2031, the completion of such purchases, 50.5% of environmental costs attributed to Springerville Unit 1coal for Four Corners will be reimbursed by third party owners.purchased from the Navajo Transitional Energy Company (NTEC). NTEC purchased the mine located near Four Corners from BHP Billiton and will begin overseeing the mine operation in 2016.
(3)
BHP Billiton sold San Juan Coal Co. to Westmoreland Coal Company, effective January 31, 2016.
Certain environmental costsTEP Operated Generating Facilities
The coal supplies for Springerville Units 1 and investments can2 are transported approximately 200 miles by railroad from northwestern New Mexico. TEP expects coal reserves to be recoveredsufficient to supply the estimated requirements for Springerville Units 1 and 2 for their estimated remaining lives.
TEP no longer uses coal as a primary fuel source for Sundt Unit 4.
Coal Generating Facilities Operated by Others
TEP also participates in jointly-owned coal-fired generating facilities at the Four Corners Generating Station (Four Corners), the Navajo Generating Station (Navajo), and the San Juan Generating Station (San Juan). Four Corners, which is operated by Arizona Public Service Company (APS), and San Juan, which is operated by Public Service Company of New Mexico (PNM), are mine-mouth generating stations located adjacent to the coal reserves. Navajo, which is operated by SRP, obtains its coal supply from the nearby Kayenta coal mine and receives deliveries on a dedicated electric rail delivery system. Effective January 31, 2016, Westmoreland Coal Company purchased San Juan Coal Company (SJCC) from BHP Billiton and has also agreed to a new coal supply agreement extending through June 30, 2022. TEP expects coal reserves available to these three jointly-owned generating facilities to be sufficient for the remaining lives of the stations.
Natural Gas Supply
TEP uses generation from its facilities fueled by natural gas, in addition to energy from its coal-fired facilities and purchased power, to meet the summer peak demands of its retail customers and local reliability needs. The average cost of natural gas per MMBtu, including transportation, was $3.49 in 2015, $5.17 in 2014, and $4.55 in 2013.

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TEP purchases capacity from El Paso Natural Gas (EPNG) for transportation from the San Juan and Permian Basins to its Sundt plant under firm transportation agreements. TEP also purchases firm gas transportation for Gila River Unit 3 from EPNG and Transwestern Pipeline Co., and for Luna Generating Station (Luna) from EPNG. TEP purchases gas from Southwest Gas Corporation under a retail tariff for North Loop’s 94 MW of internal combustion turbines and receives distribution service under a transportation agreement for DeMoss Petrie, a 75 MW internal combustion turbine.
TRANSMISSION AND DISTRIBUTION
TEP's transmission system is part of the Western Interconnection, which includes the interconnected transmission systems of 14 western states, two Canadian provinces and parts of Mexico. TEP's transmission system, together with contractual rights on other transmission systems, enables TEP to integrate and access generation resources to meet its customer load requirements. TEP's transmission and distribution systems included approximately 2,170 miles of transmission lines, and 7,557 miles of distribution lines as of December 31, 2015.
In 2015, TEP completed construction and placed into service a 500-Kilo-volt (kV) transmission line extending from the Pinal Central substation to TEP’s Tortolita substation northwest of Tucson. The transmission line was built to provide additional transmission capacity from the Palo Verde area into TEP’s northern service territory.
RATES AND REGULATION
The ACC and the FERC each regulate portions of the utility accounting practices and rates of TEP. The ACC regulates rates charged to retail customers, the siting of generation and transmission facilities, the issuance of debt, transactions with affiliated parties, and other utility matters. The ACC also enacts other regulations and policies that can affect business decisions and accounting practices. The FERC regulates terms and prices of transmission services and wholesale electricity sales.
2015 Rate Case
In November 2015, TEP filed a general rate mechanism, calledcase with the Environmental Cost Adjustor, that was approvedACC requesting a Base Rate increase of $110 million and various rate design changes. See Note 2 of Notes to Consolidated Financial Statements in the 2013 TEP Rate Order. SeeItem 8 of this From 10-K and Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, TEP, Factors Affecting Results of Operations 2013for key provisions regarding the 2015 Rate Case.
Purchased Power and Fuel Adjustment Clause
The Purchased Power and Fuel Adjustment Clause (PPFAC) allows TEP Rate Order.to recover its fuel, transmission, and purchased power costs, including demand charges, and the costs of contracts for hedging fuel and purchased power costs for its retail customers. The PPFAC consists of a forward component and a true-up component.
The true-up component reconciles any over/under collected amounts from the preceding 12-month period and is credited to or recovered from customers in the subsequent year.
TEP’s PPFAC also includes the recovery of the following costs and/or credits: lime costs used to control sulfur dioxide (SO2) emissions at Springerville; sulfur credits received from TEP’s coal suppliers; broker fees; revenues from short-term wholesale sales; and all of the proceeds from the sale of SO2 allowances.
Coal Combustion ResidualsAt December 31, 2015, TEP had over-collected fuel and purchased power costs by $18 million.
Renewable Energy Standards and Tariff
The ACC’s RES requires TEP and other affected utilities to increase their use of renewable energy each year until it represents at least 15% of their total annual retail energy requirements in 2025, with distributed generation accounting for 30% of the annual renewable energy requirement. Affected utilities must file an annual RES implementation plan for review and approval by the ACC. The approved cost of carrying out those plans is recovered from retail customers through the RES surcharge until such costs are reflected in TEP’s Base Rates. The associated lost revenues attributable to meeting distributed generation targets will be partially recovered through the Lost Fixed Cost Recovery Mechanism (LFCR). See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
In July 2015, TEP submitted its application for the 2016 RES implementation plan that includes a budget of $57 million, which will be partially offset by applying approximately $9 million of previously recovered carryover funds. TEP proposed to recover $48 million through the RES surcharge. The budget will fund the following: the above market cost of renewable energy purchases; previously awarded performance-based incentives for customer installed distributed generation; depreciation and a return on TEP's investments in company-owned solar projects; and various other program costs. TEP expects to receive a

8



decision on the application in the first half 2016. TEP expects to recognize approximately $9 million of revenue in 2016 as a return on company-owned solar projects.
The percentage of retail kilowatt-hour (kWh) sales attributable to the 2015 RES renewable energy requirement was 8.6%, exceeding the overall 2015 requirement of 5.0%. TEP expects to meet the 2016 RES renewable energy requirement of 6.0% of retail kWh sales. Compliance is determined through the ACC's review of TEP's annual RES implementation plan. As TEP no longer pays incentives to obtain distributed generation Renewable Energy Credits (REC), which are used to demonstrate compliance with the distributed generation requirement, TEP has requested a waiver of the RES distributed generation requirements in its 2016 RES implementation plan.
Energy Efficiency Standards
In 2010, the ACC approved new Energy Efficiency Standards (EE Standards) designed to require electric utilities to implement cost-effective programs to reduce customers' energy consumption. The EE Standards require increasing cumulative annual targeted retail kWh savings equal to 22% by 2020. Since the implementation of the EE Standards, TEP’s cumulative annual energy savings are approximately 9.3% of retail kWh sales in 2015. Compliance with the EE Standards is determined through the ACC's review of the company's annual energy efficiency implementation plan.
In February 2016, the ACC approved TEP’s 2016 energy efficiency implementation plan. Under the 2016 plan, TEP has been approved to recover approximately $14 million from retail customers and will offer customers new and existing DSM programs. Energy savings realized through the programs will count toward Arizona’s EE Standards and the associated lost revenue will be partially recovered through the LFCR. See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.

ENVIRONMENTAL MATTERS
The EPA proposed a rule to regulateregulates the handling and disposalamount of coal ashSO2, nitrogen oxide (NOx), carbon dioxide (CO2), particulate matter, mercury and other Coal Combustion Residuals (CCRs).by-products produced by power plants. TEP may incur added costs to comply with future changes in federal and state environmental laws, regulations, and permit requirements at its power plants. Environmental laws and regulations are subject to a range of interpretations, which may ultimately be resolved by the courts. Because these laws and regulations continue to evolve, TEP is unable to predict the impact of the changing laws and regulations on its operations and consolidated financial results. TEP expects to recover the cost of environmental compliance from its ratepayers.
National Ambient Air Quality Standards
In October 2015, the EPA released the final rule for the 8-hour Ozone NAAQS or Ozone Standard. The EPA lowered the standard from 75 parts per billion (ppb) to 70ppb. If Pima County does not meet the standard, the county will be designated as a “non-attainment” area and will need to develop a plan to bring the air-shed into compliance. A “non-attainment” designation may slow economic growth in the region and impact our ability to site new local generation.
Implementation of the rule is scheduled as follows:
States’ recommendation of area designations (attainment, non-attainment, or unclassified) by October 2016.
EPA's response to states’ designation recommendation by June 2017.
EPA's finalization of area designations by October 2017, based on 2014-2016 air quality data.
Effluent Limitation Guidelines
In September 2015, as part of the Clean Water Act the EPA published the final Effluent Limitation Guidelines setting technology standards and limitations for steam electric power plant discharges. The rule sets the first federal limits on the levels of toxic metals in wastewater that can be discharged from power plants, based on technology improvements in the steam electric power industry over the last three decades. TEP is evaluating the effects of this rule on its facilities including Navajo, San Juan, and Four Corners. Since the majority of TEP's facilities are zero discharge, TEP does not anticipate a significant financial impact.
TEP believes it is in material compliance with applicable laws and regulations. Refer to Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Environmental Laws and Regulations of this Form 10-K for additional information related to environmental laws and regulations impacting TEP's liquidity and capital resources and Liquidity and Capital Resources for TEP's forecasted environmental-related capital expenditures.

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EMPLOYEES
At December 31, 2015, TEP had 1,478 employees, of which approximately 688 were represented by the International Brotherhood of Electrical Workers (IBEW) Local No. 1116. A new collective bargaining agreement between the IBEW and TEP was entered into in January 2016 and expires in January 2019.

SEC REPORTS AVAILABLE ON TEP'S WEBSITE
TEP makes available its annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports as soon as reasonably practical after we electronically file or furnish them to the Securities and Exchange Commission (SEC). These reports are available free of charge through TEP’s website address at www.tep.com/about/investors/.
UNS Energy’s code of ethics, which applies to the Board of Directors and all officers and employees of UNS Energy and its subsidiaries, including TEP, and any amendments or any waivers made to the code of ethics, is also available on TEP’s website at www.tep.com/about/investors/.
TEP is providing the address of TEP’s website solely for the information of investors and does not intend the address to be an active link. Information contained at TEP’s website is not part of, or incorporated by reference into, any report or other filing filed with the SEC by TEP.

ITEM 1A. RISK FACTORS
The business and financial results of TEP are subject to a number of risks and uncertainties, including those set forth below. These risks and uncertainties fall primarily into five major categories: revenues, regulatory, environmental, financial, and operational.
REVENUES
National and local economic conditions can negatively affect the results of operations, net income, and cash flows at TEP.
Economic conditions have contributed significantly to a reduction in TEP’s retail customer growth and lower energy usage by the company’s residential, commercial, and industrial customers. As a result of weak economic conditions, TEP’s average retail customer base grew by less than 1% in each year from 2011 through 2015 compared with average increases of approximately 1% in each year from 2005 to 2009. TEP estimates that a 1% change in annual retail sales could impact pre-tax net income and pre-tax cash flows by approximately $6 million.
New technological developments and compliance with the ACC's EE Standards and RES will continue to have a significant impact on retail sales, which could negatively impact TEP’s results of operations, net income, and cash flows.
Research and development activities are ongoing for new technologies that produce power or reduce power consumption. These technologies include renewable energy, customer-owned generation, and appliances, equipment, and control systems. Continued development and use of these technologies and compliance with the ACC's EE Standards could further impact the results of operations, net income, and cash flows of TEP.
The revenues, results of operations, and cash flows of TEP are seasonal, and are subject to weather conditions and customer usage patterns, which are beyond the company’s control.
TEP typically earns the majority of its operating revenue and net income in the third quarter because retail customers increase their air conditioning usage during the summer. Conversely, TEP’s first quarter net income is typically limited by relatively mild winter weather in its retail service territory. Cool summers or warm winters may reduce customer usage, adversely affecting operating revenues, cash flows, and net income by reducing sales.
TEP is dependent on a small segment of large customers for future revenues. A reduction in the electricity sales to these customers would negatively affect our results of operations, net income, and cash flows.
TEP sells electricity to mines, military installations, and other large industrial customers. In 2015, 35% of TEP’s retail kWh sales were to 592 industrial and mining customers. Retail sales volumes and revenues from these customer classes could

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decline as a result of, among other things: global, national, and local economic conditions; curtailments of customer operations due to declines in commodity prices; decisions by the federal government to close military bases; the effects of energy efficiency and distributed generation; or the decision by customers to self-generate all or a portion of their energy needs. A reduction in retail kWh sales to TEP’s large customers would negatively affect our results of operations, net income, and cash flows.
REGULATORY
TEP is subject to regulation by the ACC, which sets the company’s Retail Rates and oversees many aspects of its business in ways that could negatively affect the company’s results of operations, net income, and cash flows.
The ACC is a constitutionally created body composed of five elected commissioners. Commissioners are elected state-wide for staggered four-year terms and are limited to serving a total of two terms. As a result, the composition of the commission, and therefore its policies, are subject to change every two years.
TEP’s Retail Rates consist of Base Rates and various rate adjustors that allow for timely recovery of certain costs between rate cases. The ACC is charged with setting Retail Rates that allow TEP to recover its costs of service and an opportunity to earn a reasonable rate of return. In setting TEP’s Retail Rates, the ACC could disallow the recovery of costs or not provide for the timely recovery of costs. The decisions made by the ACC on such matters impact the net income and cash flows of TEP.
Changes in federal energy regulation may negatively affect the results of operations, net income, and cash flows of TEP.
TEP is subject to the impact of comprehensive and changing governmental regulation at the federal level that continues to change the structure of the electric and gas utility industries and the ways in which these industries are regulated. TEP is subject to regulation by the FERC. The FERC has proposed regulating CCRsjurisdiction over rates for electric transmission in interstate commerce and rates for wholesale sales of electric power, including terms and prices of transmission services and sales of electricity at wholesale.
As a result of the Energy Policy Act of 2005, owners and operators of bulk power systems, including TEP, are subject to mandatory transmission standards developed and enforced by NERC and subject to the oversight of the FERC. Compliance with modified or new transmission standards may subject TEP to higher operating costs and increased capital costs. Failure to comply with the mandatory transmission standards could subject TEP to sanctions, including substantial monetary penalties.
ENVIRONMENTAL
TEP is subject to numerous environmental laws and regulations that may increase its cost of operations or expose it to environmentally-related litigation and liabilities.Many of these regulations could have a significant impact on TEP due to its reliance on coal as either non-hazardousits primary fuel for electric generation.
Numerous federal, state, and local environmental laws and regulations affect present and future operations. Those laws and regulations include rules regarding air emissions, water use, wastewater discharges, solid waste, or hazardous waste. The hazardous waste alternative would require additional capital investments and operational costs for both storage and handling at plants and transportation to disposal locations. Both the hazardous waste, and non-hazardous solid waste alternatives wouldmanagement of coal combustion residuals.
These laws and regulations can contribute to higher capital, operating, and other costs, particularly with regard to enforcement efforts focused on existing power plants and new compliance standards related to new and existing power plants. These laws and regulations generally require linersus to obtain and comply with a wide variety of environmental licenses, permits, authorizations, and other approvals. Both public officials and private individuals may seek to enforce applicable environmental laws and regulations. Failure to comply with applicable laws and regulations may result in litigation, and the imposition of fines, penalties, and a requirement by regulatory authorities for costly equipment upgrades.
Existing environmental laws and regulations may be revised and new ash landfillsenvironmental laws and regulations may be adopted or expansionsbecome applicable to our facilities. Increased compliance costs or additional operating restrictions from revised or additional regulation could have an adverse effect on our results of operations, particularly if those costs are not fully recoverable from our customers. TEP’s obligation to comply with the EPA’s Best Available Retrofit Technology (BART) determinations as a participant in the San Juan, Four Corners, and Navajo plants, coupled with the financial impact of future climate change legislation, other environmental regulations and other business considerations, could jeopardize the economic viability of these plants or the ability of individual participants to meet their obligations and willingness to continue their participation in these plants. TEP cannot predict the ultimate outcome of these matters.
TEP also is contractually obligated to pay a portion of the environmental reclamation costs incurred at generating stations in which it has a minority interest and is obligated to pay similar costs at the mines that supply these generating stations. While TEP has recorded the portion of its costs that can be determined at this time, the total costs for final reclamation at these sites are unknown and could be substantial.

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Federal regulations limiting greenhouse gas emissions require a shift in generation from coal to natural gas and renewable generation and could increase TEP's cost of operations.
In August 2015, the EPA issued the Clean Power Plan (CPP) limiting CO2 emissions from existing ash landfills.and new fossil fueled power plants. The rules willCPP establishes state-level CO2 emission rates and mass-based goals that apply to CCRs producedfossil fuel-fired generation. The plan requires CO2 emission reductions for existing facilities by 2030 and establishes interim goals that begin in 2022. The CPP will require a shift in generation from coal to natural gas and renewables and could lead to the early retirement of coal generation in Arizona within the 2022 to 2030 compliance time-frame. TEP will continue to work with the other Arizona and New Mexico utilities, as well as the appropriate regulatory agencies, to develop compliance strategies. TEP is unable to determine how the final CPP rule will impact its facilities until the plans are developed and approved by the EPA.
Early closure of TEP's coal-fired generation plants resulting from environmental regulations could result in TEP recognizing impairments in respect of such plants and increased cost of operations if recovery of our remaining investments in such plants and the costs associated with such early closures were not permitted through rates charged to customers.
TEP's coal-fired generating stations may be required to be closed before the end of their useful lives in response to recent or future changes in environmental regulation, including potential regulation relating to greenhouse gas emissions. If any of the coal-fired generation plants, or coal handling facilities, from which TEP obtains power are closed prior to the end of their useful life, TEP could be required to recognize an impairment of its assets and incur added expenses relating to accelerated depreciation and amortization, decommissioning, reclamation and cancellation of long-term coal contracts of such generating plants and facilities. Closure of any of such generating stations may force TEP to incur higher costs for replacement capacity and energy. TEP may not be permitted full recovery of these costs in the rates it charges its customers. As of December 31, 2015, approximately 49% of TEP's generating capacity is fueled by coal.
FINANCIAL
The Third-Party Owners of Springerville Unit 1 have and may continue to refuse to pay some, or all, of their pro-rata share of the costs and expenses associated with SpringervilleUnit 1.
TEP owns 49.5% of Springerville Unit 1 and two separate third-parties own the remaining 50.5%. Starting in January 2015, TEP is obligated to operate Springerville Unit 1 for these Third-Party Owners under existing agreements. TEP and the Third-Party Owners disagree on several key aspects of these agreements, including the allocation of Springerville Unit 1 operating and maintenance expenses, capital improvement costs, and transmission rights. In addition, since late 2014 the Third-Party Owners have filed separate complaints at the FERC, in New York State court, and with the American Arbitration Association that include allegations that TEP violated certain provisions of the governing agreements in relation to TEP’s operation of Springerville Unit 1. Because of these disagreements and the pending litigation, the Third-Party Owners have and may continue to refuse to pay some or all of their pro-rata share of such Springerville Unit 1 costs and expenses. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016. The Third-Party Owners’ share of estimated 2016 operations and maintenance costs for Springerville Unit 1 is approximately $27 million and their share of estimated 2016 capital expenditures is approximately $9 million.
Volatility or disruptions in the financial markets, or unanticipated financing needs, could: increase our financing costs; limit our access to the credit markets; affect our ability to comply with financial covenants in our debt agreements; and increase our pension funding obligations. Such outcomes may adversely affect our liquidity and our ability to carry out our financial strategy.
We rely on access to the bank markets and capital markets as a significant source of liquidity and for capital requirements not satisfied by the cash flow from our operations. Market disruptions such as those experienced in 2008 and 2009 in the United States and abroad may increase our cost of borrowing or adversely affect our ability to access sources of liquidity needed to finance our operations and satisfy our obligations as they become due. These disruptions may include turmoil in the financial services industry, including substantial uncertainty surrounding particular lending institutions and counterparties we do business with, unprecedented volatility in the markets where our outstanding securities trade, and general economic downturns in our utility service territories. If we are unable to access credit at competitive rates, or if our borrowing costs dramatically increase, our ability to finance our operations, meet our short-term obligations, and execute our financial strategy could be adversely affected.
Changing market conditions could negatively affect the market value of assets held in our pension and other retiree plans and may increase the amount and accelerate the timing of required future funding contributions.

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Plant closings or changes in power flows into our service territory could require us to redeem or defease some or all of the tax-exempt bonds issued for our benefit. This could result in increased financing costs.
TEP has financed a substantial portion of utility plant assets with the proceeds of pollution control revenue bonds and industrial development revenue bonds issued by governmental authorities. Interest on these bonds is, subject to certain exceptions, excluded from gross income for federal tax purposes. This tax-exempt status is based, in part, on continued use of the assets for pollution control purposes or the local furnishing of energy within TEP’s two-county retail service area.
As of December 31, 2015, there were outstanding approximately $309 million aggregate principal amount of tax-exempt bonds that financed pollution control facilities at TEP’s generating units. Should certain of TEP’s generating units be retired and dismantled prior to the stated maturity dates of the related tax-exempt bonds, it is possible that some or all of the bonds financing such facilities would be subject to mandatory early redemption by TEP. Of the total amount outstanding, $37 million of the principal amount of the bonds can currently be redeemed at par upon notice to holders, and $272 million principal amount of the bonds have early redemption dates or final maturities ranging from 2019 to 2022.
In addition, as of December 31, 2015, there were outstanding approximately $307 million aggregate principal amount of tax-exempt bonds that financed local furnishing facilities. Depending on changes that may occur to the regional generation mix in the desert southwest, to the regional bulk transmission network, or to the demand for retail energy in TEP’s local service area, it is possible that TEP would no longer qualify as a local furnisher of energy within the meaning of the Internal Revenue Code. In recent years, reductions in retail demand in the winter months have made it increasingly difficult for TEP to continue to qualify as a local furnisher of electricity. If TEP could no longer qualify as a local furnisher of energy, all of TEP’s coal-fired generating assets. San Juan may alsotax-exempt local furnishing bonds would be subject to separatemandatory early redemption by TEP or defeasance to the earliest possible redemption date. Of the total tax-exempt local furnishing bonds outstanding, $100 millionof the principal amount of the bonds can currently be redeemed at par upon notice to holders, and $207 million principal amount of the bonds have early redemption dates ranging from 2020 to 2023.
TEP’s net income and cash flows can be adversely affected by rising interest rates.
At December 31, 2015, TEP had $137 million of tax-exempt variable rate debt obligations. The interest rates are set weekly or monthly. The average weekly interest rates (including Letters of Credit (LOCs) and remarketing fees) ranged from 0.93% - 1.42% in 2015. The average monthly interest rates ranged from 0.79% - 0.87%. A 100 basis point increase in the average interest rates on this debt over a twelve-month period would increase TEP’s interest expense by approximately $1 million.
TEP is also subject to risk resulting from changes in the interest rate on its borrowings under the 2015 Credit Agreement. Such borrowings may be made on a spread over London Interbank Offer Rate (LIBOR) or an Alternate Base Rate.
If short-term interest rates rise, the resulting increase in the cost of variable rate borrowings would negatively impact our results of operations, net income, and cash flows. Likewise, if capital market conditions result in higher long-term interest rates, TEP’s borrowing costs would increase on any new long-term debt needed to finance capital expenditures or to refinance existing long-term debt.
OPERATIONAL
The operation of electric generating stations, and transmission and distribution systems, involves risks that could result in reduced generating capability or unplanned outages that could adversely affect TEP’s results of operations, net income, and cash flows.
The operation of electric generating stations, and transmission and distribution systems, involves certain risks, including equipment breakdown or failure, fires, weather, and other hazards, interruption of fuel supply, and lower than expected levels of efficiency or operational performance. Unplanned outages, including extensions of planned outages due to equipment failure or other complications, occur from time to time and are an inherent risk of our business. If TEP’s generating stations and transmission and distribution systems operate below expectations, TEP’s operating results could be adversely affected and/or TEP's capital spending could be increased.
TEP receives power from certain generating facilities that are jointly owned and operated by third parties. Therefore, TEP may not have the ability to affect the management or operations at such facilities which could adversely affect TEP’s results of operations, net income, and cash flows.
Certain of the generating stations from which TEP receives power are jointly owned with, or are operated by, third parties. TEP may not have the sole discretion or any ability to affect the management or operations at such facilities. As a result of this reliance on other operators, TEP may not be able to ensure the proper management of the operations and maintenance of the plants. Further, TEP may have no ability or a limited ability to make determinations on how best to manage the changing regulations being draftedwhich may

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affect such facilities. In addition, TEP will not have sole discretion as to how to proceed in the face of requirements relating to environmental compliance which could require significant capital expenditures or the closure of such generating stations. A divergence in the interests of TEP and the co-owners or operators, as applicable, of such generating facilities could negatively impact the business and operations of TEP.
We may be subject to physical attacks.
As operators of critical energy infrastructure, we may face a heightened risk of physical attacks on our electric systems. Our electric generation, transmission, and distribution assets and systems are geographically dispersed and are often in rural or unpopulated areas which make them especially difficult to adequately detect, defend from, and respond to such attacks.
If, despite our security measures, a significant physical attack occurred, we could have our operations disrupted, property damaged, experience loss of revenues, response costs, and other financial loss; and be subject to increased regulation, litigation, and damage to our reputation, any of which could have a negative impact on our business and results of operations.
We may be subject to cyber attacks.
We may face a heightened risk of cyber attacks. Our information and operations technology systems may be vulnerable to unauthorized access due to hacking, viruses, acts of war or terrorism, and other causes. Our operations technology systems have direct control over certain aspects of the electric system and, in addition, our utility business requires access to sensitive customer data, including personal and credit information, in the ordinary course of business.
If, despite our security measures, a significant cyber breach occurred, we could have our operations disrupted, property damaged, and customer information stolen; experience loss of revenues, response costs, and other financial loss; and be subject to increased regulation, litigation, and damage to our reputation, any of which could have a negative impact on our business and results of operations.

ITEM 1B. UNRESOLVED STAFF COMMENTS
None.

ITEM 2. PROPERTIES
Transmission facilities owned by TEP and by third parties are located in Arizona and New Mexico and transmit the output from TEP’s electric generating stations at Four Corners, Navajo, San Juan, Springerville, Gila River, and Luna to the Tucson area for use by TEP’s retail customers. The transmission system is interconnected at various points in Arizona and New Mexico with other regional utilities. See Part I, Item 1. Business, General for additional information regarding the transmission facilities.
TEP's electric generating stations (except as noted below), administrative headquarters, warehouses and service centers are located on land owned by TEP. The electric distribution and transmission facilities owned by TEP are located:
on property owned by TEP;
under or over streets, alleys, highways, and other places in the public domain, as well as in national forests and state lands, under franchises, easements, or other rights which are generally subject to termination;
under or over private property as a result of easements obtained primarily from the record holder of title; or
over American Indian reservations under grant of easement by the OfficeSecretary of Surface Mining Reclamationthe Interior or lease by American Indian tribes.
It is possible that some of the easements, and Enforcementthe property over which the easements were granted, may have title defects or liens existing at the time the easements were acquired.
Springerville is located on property held by TEP under a term patent with the State of Arizona. TEP, under separate sale and leaseback arrangements, leases a 50% undivided interest in the Springerville Common Facilities (which do not include land).
Four Corners and Navajo are located on properties held under easements from the United States and under leases from the Navajo Nation. TEP, individually and in conjunction with PNM in connection with San Juan, has acquired land rights, easements and leases for the plant, transmission lines and a water diversion facility located on land owned by the Navajo

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Nation. TEP also has acquired easements for transmission facilities related to San Juan, Four Corners, and Navajo located on reservation lands of the Zuni, Navajo, and Tohono O’odham Nations. TEP, in conjunction with PNM and Samchully Power & Utilities 1 LLC, holds an undivided ownership interest in the property on which Luna is located.
TEP’s rights under these various easements and leases may be subject to defects such as:
possible conflicting grants or encumbrances due to the absence of, or inadequacies in, the recording laws or record systems of the Bureau of Indian Affairs (BIA) and the American Indian tribes;
possible inability of TEP to legally enforce its rights against adverse claimants and the American Indian tribes without Congressional consent; or
failure or inability of the American Indian tribes to protect TEP’s interests in the easements and leases from disruption by the U.S. Congress, Secretary of the Interior, or other adverse claimants.
These possible defects have not interfered, and are not expected to materially interfere, with TEP’s interest in and operation of its facilities.
Under separate ground lease agreements, TEP leased parcels of land for the following photovoltaic facilities:
The Solar Zone of the University of Arizona Tech Park in Pima County, Arizona; and
Bright Tucson Community Solar Blocks in Pima County, Arizona.
In December 2014, TEP placed in service an additional photovoltaic facility in Cochise County, Arizona, for which TEP entered into a 30-year easement agreement. The easement is to facilitate the operations of a solar photovoltaic renewable energy generation system on behalf of the Department of the Army, located at Fort Huachuca in Cochise County.
See Item 1. Business, General for additional information regarding generating facilities.

ITEM 3. LEGAL PROCEEDINGS
Springerville Unit 1 Proceedings
Upon the termination of the Springerville Unit 1 Leases on January 1, 2015, 50.5% of Springerville Unit 1, or 195 MW of capacity, continued to be owned by third parties, Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the Third-Party Owners’ Springerville Unit 1 power.
Commencing on January 1, 2015, with the termination of the leases, TEP is obligated to operate the unit for the Third-Party Owners under existing agreements. In 2014, TEP and the Third-Party Owners engaged in discussions regarding the post-lease operation of Springerville Unit 1 and related cost sharing arrangements, but did not reach agreement on several key points.
In November 2014, the Springerville Unit 1 Third-Party Owners filed a complaint (FERC Action) against TEP at the FERC alleging that TEP had not agreed to wheel power and energy for the Third-Party Owners in the manner specified in the existing Springerville Unit 1 facility support agreement between TEP and the Third-Party Owners and for the cost specified by the Third-Party Owners. The Third-Party Owners requested an order from the FERC requiring such wheeling of the Third-Party Owners’ energy from their Springerville Unit 1 interests beginning in January 2015 to the Palo Verde switchyard and for the price specified by the Third-Party Owners. In February 2015, the FERC issued an order denying the Third-Party Owners complaint. In March 2015, the Third-Party Owners filed a request for rehearing in the FERC Action, which the FERC denied in October 2015. In December 2015, the Third-Party Owners appealed the FERC’s order denying the Third-Party Owners' complaint to the U.S. Court of Appeals for the Ninth Circuit. In December 2015, TEP filed an unopposed motion to intervene in the Ninth Circuit appeal.
On December 19, 2014, the Third-Party Owners filed a complaint against TEP in the Supreme Court of the State of New York, New York County (New York Action). In response to motions filed by TEP to dismiss various counts and compel arbitration of certain of the matters alleged, and the court’s subsequent ruling on the motions, the Third-Party Owners have amended the complaint three times, dropping certain of the allegations and raising others in the New York Action and in the arbitration proceeding described below. As amended, the New York Action alleges, among other things, that TEP failed to properly operate, maintain, and make capital investments in Springerville Unit 1 during the term of the leases and that TEP has breached

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the lease transaction documents by refusing to pay certain of the Third-Party Owners’ claimed expenses. The third amended complaint seeks $71 million in liquidated damages and direct and consequential damages in an amount to be determined at trial. The Third-Party Owners have also agreed to stay their claim that TEP has not agreed to wheel power and energy as required pending the outcome of the FERC Action. In November 2015, the Third-Party Owners filed a motion for summary judgment on their claim that TEP has failed to pay certain of the Third-Party Owners’ claimed expenses.
In December 2014 and January 2015, Wilmington Trust Company, as Owner Trustees and Lessors under the leases of the Third-Party Owners, sent a notice to TEP that alleged that TEP had defaulted under the Third-Party Owners’ leases. The notices demanded that TEP pay liquidated damages totaling approximately $71 million. In letters to the Owner Trustees, TEP denied the allegations in the notices.
In April 2015, TEP filed a demand for arbitration with the American Arbitration Association (AAA) seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expenses and capital expenditures for Springerville Unit 1. In June 2015, the Third-Party Owners filed a separate demand for arbitration with the AAA alleging, among other things, that TEP has failed to properly operate, maintain and make capital investments in Springerville Unit 1 since the leases have expired. The Third-Party Owners’ arbitration demand seeks declaratory judgments, damages in an amount to be determined by the arbitration panel and the Third-Party Owners’ fees and expenses. TEP and the Third-Party Owners have since agreed to consolidate their arbitration demands into one proceeding. In August 2015, the Third-Party Owners filed an amended arbitration demand adding claims that TEP has converted the Third-Party Owners’ water rights and certain emission reduction payments and that TEP is improperly dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. The arbitration hearing is scheduled for July 2016.
In November 2015, TEP filed a petition to confirm the interim arbitration order in the Supreme Court of the State of New York naming the Owner Trustee and Co-Trustee as respondents. The petition seeks an order from the court confirming the interim arbitration order under the Federal Arbitration Act. In December 2015, the Owner Trustees filed an answer to the petition and a cross-motion to vacate the interim arbitration order.
As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
TEP cannot predict the outcome of the claims relating to Springerville Unit 1, and, due to the general and non-specific scope and nature of the claims, TEP cannot determine estimates of the range of loss, if any, at this time. TEP intends to vigorously defend itself against the claims asserted by the Third-Party Owners and to vigorously pursue the claims it has asserted against the Owner Trustees and Co-Trustees.
TEP and the Third-Party Owners have agreed to stay these litigation matters relating to Springerville Unit 1 in furtherance of settlement negotiations. However, there is no assurance that a settlement will be reached or that the litigation will not continue.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Factors Affecting Results of Operations for additional information regarding Springerville Unit 1.

ITEM 4. MINE SAFETY DISCLOSURES
Not applicable.


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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS, AND ISSUER PURCHASES OF EQUITY SECURITIES
Market Information
TEP’s common stock is wholly-owned by UNS Energy and is not listed for trading on any stock exchange.
Dividends
TEP paid dividends to UNS Energy of $50 million in 2015 and $40 million in 2014 and 2013.
TEP can pay dividends if it maintains compliance with its 2015 Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement which all contain substantially the same financial covenants. At December 31, 2015, TEP was in compliance with the terms of all financial covenants and agreements.
The ACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and reported to the ACC annually beginning on April 1, 2016. As of December 31, 2015, TEP's dividend payments were still restricted as the 50 percent of total capital threshold had not yet been reached.

ITEM 6. SELECTED FINANCIAL DATA
(in thousands)2015 2014 2013 2012 2011
Income Statement Data         
Operating Revenues$1,306,544
 $1,269,901
 $1,196,690
 $1,161,660
 $1,156,386
Net Income127,794
 102,338
 101,342
 65,470
 85,334
Balance Sheet Data         
Total Utility Plant, Net$3,558,229
 $3,425,190
 $2,944,455
 $2,750,421
 $2,650,652
Total Assets (1)
4,249,478
 4,119,830
 3,490,085
 3,413,638
 3,247,647
          
Long-Term Debt, Net (1)
$1,451,720
 $1,361,828
 $1,213,367
 $1,213,246
 $1,072,037
Non-Current Capital Lease Obligations55,324
 69,438
 131,370
 262,138
 352,720
Cash Flow Data         
Net Cash Flows From Operating Activities$364,934
 $313,663
 $346,191
 $267,919
 $268,294
Net Cash Flows From Investing Activities(502,891) (517,638) (259,662) (227,881) (312,011)
Net Cash Flows From Financing Activities119,471
 252,810
 (140,937) 11,987
 51,452
Other Data         
Ratio of Earnings to Fixed Charges (2)
3.74
 2.56
 2.67
 2.10
 2.40
(1)
Total Assets and Long-term Debt, Net were adjusted to reflect the reclassifications made as a result of the recently adopted accounting pronouncements. See Note 1 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding recently adopted accounting pronouncements.
(2)
For purposes of this computation, earnings are defined as pre-tax earnings from continuing operations before minority interest, or income/loss from equity method investments, plus interest expense and amortization of debt discount and expense related to indebtedness. Fixed charges are interest expense, including amortization of debt discount, interest on operating lease payments, and expense on indebtedness, including capital lease obligations.
See Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations for additional information.


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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Management’s Discussion and Analysis explains the results of operations, the general financial condition, and the outlook for TEP. It includes the following:
outlook and strategies;
operating results during 2015 compared with the same periods of 2014, and 2014 compared with 2013;
factors affecting our results and outlook;
liquidity, capital needs, capital resources, and contractual obligations;
dividends; and
critical accounting estimates.
Management’s Discussion and Analysis includes financial information prepared in accordance with Generally Accepted Accounting Principles in the United States of America (GAAP), as well as certain non-GAAP financial measures. The non-GAAP financial measures should be viewed as a supplement to, and not a substitute for, financial measures presented in accordance with GAAP. Non-GAAP financial measures as presented herein may not be comparable to similarly titled measures used by other companies.
Management’s Discussion and Analysis should be read in conjunction with Item 6 of this Form 10-K and the Consolidated Financial Statements and Notes in Item 8 of this Form 10-K. For information on factors that may cause our actual future results to differ from those we currently seek or anticipate, see Forward-Looking Information at the front of this report and Part I, Item 1A. Risk Factors for additional information.
References in this report to "we" and "our" are to TEP.

OUTLOOK AND STRATEGIES
TEP's financial prospects and outlook are affected by many factors including: global, national, regional, and local economic conditions; volatility in the financial markets; environmental laws and regulations; and other regulatory factors. Our plans and strategies include the following:
Achieving a constructive outcome in our pending rate case proceeding that provides TEP recovery of its full cost of service and an opportunity to earn an appropriate return on its rate base investments, updated rates to provide more accurate price signals and a more equitable allocation of costs to TEP's customers, and enables TEP to continue to provide safe and reliable service.
Continuing to focus on our long-term generation resource strategy, including shifting from coal to natural gas, renewables, and energy efficiency while providing rate stability for our customers, mitigating environmental impacts, complying with regulatory requirements, leveraging our existing utility infrastructure, and maintaining financial strength.
Developing strategic responses to new environmental regulations and potential new legislation, including new carbon emission standards to reduce greenhouse gas emissions from existing power plants. We are evaluating TEP's existing mix of generation resources and defining steps to achieve environmental objectives that protect the financial stability of our utility business and the interests of our customers.
Strengthening the underlying financial condition of TEP by achieving constructive regulatory outcomes, strengthening our capital structure, sustaining our credit ratings, and promoting economic development in our service territory.
Focusing on our core utility business through operational excellence, investing in utility rate base, emphasizing customer service, and maintaining a strong community presence.

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2015 Operational and Financial Highlights
The year ended December 31, 2015 included the following notable items:
In January 2015, TEP purchased an additional 24.8% undivided ownership interest in Springerville Unit 1, bringing its total ownership interest to 49.5%;
In January 2015, TEP purchased existing unsecured tax-exempt industrial development revenue bonds in the amount of $130 million using funds borrowed from the term loan portion of the 2014 Credit Agreement;
In February 2015, TEP issued and sold $300 million of unsecured notes;
In April 2015, TEP purchased an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities, and in May 2015, TEP sold a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
In June 2015, TEP terminated the 2014 Credit Agreement;
In June 2015, TEP received an equity contribution of $180 million from UNS Energy;
In October 2015, TEP entered into a new unsecured credit agreement (2015 Credit Agreement) that provides for a $250 million revolving credit and letter of credit (LOC) facility. The new credit agreement matures in 2020 and replaces the 2010 Credit Agreement;
In November 2015, TEP filed a general rate case with the ACC that requests, among other things, a Base Rate increase of $110 million. The application also requests that new rates become effective no later than January 1, 2017; and
In December 2015, TEP completed construction and placed into service a 500-kV transmission line extending from the Pinal Central substation to TEP’s Tortolita substation northwest of Tucson.

RESULTS OF OPERATIONS
The following discussion provides the significant items that affected TEP's results of operations for the years ended December 31, 2015, 2014 and 2013. The significant items affecting net income are presented on an after-tax basis.
2015 compared with 2014
TEP reported net income of $128 million in 2015 compared with $102 million in 2014. The increase of $26 million, or 25%, was primarily due to:
$16 million in lower O&M resulting primarily from acquisition related costs and outages at Springerville Units 1 and 2 that were incurred in 2014, partially offset by higher O&M related to Gila River, labor costs, and outside services;
$6 million in higher transmission revenue resulting primarily from an increase in sales volume on favorably priced contracts; and
$4 million in lower interest expense primarily due to a reduction in the balance of capital lease obligations.
2014 compared with 2013
TEP reported net income of $102 million in 2014 compared with $101 million in 2013. The increase of $1 million, or 1%, was primarily due to:
$25 million in higher revenues including a non-fuel Base Rate increase that was effective on July 1, 2013, an increase in LFCR revenues, higher long-term wholesale revenues due in part to an increase in the average market price and higher transmission revenue; and
$7 million in lower interest expense, primarily due to a reduction in the balance of capital lease obligations.
The increase was partially offset by:
$22 million in higher O&M for acquisition related costs, higher generating plant maintenance expense, and increased rent expense associated with the Navajo lease amendment;

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$5 million in higher income taxes primarily generated by a non-recurring $11 million tax benefit recorded in June 2013 to recover previously recorded income tax expense as a result of the 2013 TEP Rate Order. This amount is partially offset by a $2 million increase in the valuation allowance in 2013 and a $3 million increase in investment tax credits recorded in 2014. See Note 12 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding income taxes; and
$4 million in higher depreciation and amortization expenses, resulting primarily from an increase in asset base in the current year.

20



Utility Sales and Revenues
The table below provides a summary of retail kWh sales, revenues, and weather data during 2015, 2014 and 2013:
 Year Ended Increase (Decrease) Year Ended Increase (Decrease)
 2015 2014 
Percent(1)
 2013 
Percent(1)
Electric Retail Sales (kWh in millions)         
Residential3,724
 3,727
 (0.1)% 3,867
 (3.6)%
Commercial2,124
 2,170
 (2.1)% 2,187
 (0.8)%
Industrial2,063
 2,098
 (1.7)% 2,114
 (0.8)%
Mining1,109
 1,137
 (2.5)% 1,079
 5.4 %
Public Authorities33
 33
  % 32
 3.1 %
Total Electric Retail Sales9,053
 9,165
 (1.2)% 9,279
 (1.2)%
Retail Margin Revenues (in millions)         
Residential$281
 $280
 0.4 % $271
 3.3 %
Commercial185
 188
 (1.6)% 181
 3.9 %
Industrial103
 104
 (1.0)% 97
 7.2 %
Mining38
 38
  % 34
 11.8 %
Public Authorities2
 2
  % 2
  %
Total by Customer Class609
 612
 (0.5)% 585
 4.6 %
LFCR Revenues12
 11
 9.1 % 2
 *
DSM Performance Bonus3
 2
 50.0 % 1
 100.0 %
Other Retail Margin Revenues5
 1
 *
 
 *
Total Retail Margin Revenues (Non-GAAP) (1)
629
 626
 0.5 % 588
 6.5 %
Fuel and Purchased Power Revenues344
 303
 13.5 % 300
 1.0 %
DSM and RES Surcharge Revenues49
 41
 19.5 % 46
 (10.9)%
Total Retail Revenues (GAAP)$1,022
 $970
 5.4 % $934
 3.9 %
Average Retail Margin Rate (Cents / kWh) (2)
         
Residential7.55
 7.51
 0.5 % 7.02
 7.0 %
Commercial8.71
 8.66
 0.6 % 8.28
 4.6 %
Industrial4.99
 4.96
 0.6 % 4.61
 7.6 %
Mining3.43
 3.34
 2.7 % 3.14
 6.4 %
Public Authorities5.61
 6.06
 (7.4)% 5.56
 9.0 %
Total Average Margin Rate by Customer Class6.73
 6.68
 0.7 % 6.30
 6.0 %
Total Average Retail Margin Rate (3)
6.95
 6.80
 2.2 % 6.31
 7.8 %
Average Fuel and Purchased Power Rate3.80
 3.31
 14.8 % 3.24
 2.2 %
Average DSM and RES Rate0.54
 0.48
 12.5 % 0.52
 (7.7)%
Total Average Retail Rate11.29
 10.59
 6.6 % 10.07
 5.2 %
Weather Data
 
 
 
 
Cooling Degree Days         
Year Ended December 31,1,576
 1,557
 1.2 % 1,631
 (4.5)%
10-Year Average1,520
 1,515
 *
 1,491
 *
Heating Degree Days         
Year Ended December 31,1,072
 930
 15.3 % 1,449
 (35.8)%
10-Year Average1,317
 1,335
 *
 1,404
 *
* Not meaningful
(1)
Retail Margin Revenues, a non-GAAP financial measure, should not be considered as an alternative to Total Retail Revenues, which is determined in accordance with GAAP. Retail Margin Revenues exclude: (i) revenues collected from retail customers that are

21



directly offset by expenses recorded in other line items; and (ii) revenues collected from third parties that are unrelated to kWh sales to retail customers. We believe the change in Retail Margin Revenues between periods provides useful information because it disposesdemonstrates the underlying revenue trend and performance of CCRsour core utility business. Retail Margin Revenues represents the portion of retail operating revenues from kWh sales, LFCR Revenues, DSM Performance Bonus, and certain other retail margin revenues available to cover the non-fuel operating expenses of our core utility business.
(2)
Calculated on un-rounded data and may not correspond exactly to data shown in table.
(3)
Total Average Retail Margins Rates include revenues related to LFCR Revenues, DSM Performance Bonus, and Other Retail Margin Revenues included in the Total Retail Margin Revenues.
Retail Revenues were higher in surface mine pits.2015 compared with 2014 primarily due to the increase in the PPFAC rate and higher Retail Margin Revenues. Retail Margin Revenues were higher primarily due to higher LFCR revenues, DSM Performance Bonus, and Other Retail Margin Revenues related to adjustor mechanisms.
Retail Revenues were higher in 2014 compared with 2013 primarily due to higher Retail Margin Revenues and increased LFCR revenues. The increase in Retail Margin Revenues resulted from a non-fuel Base Rate increase effective July 1, 2013. These increases were partially offset by lower sales volume due to milder weather.
Wholesale Sales and Transmission Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Long-Term Wholesale Revenues$36

$28
 $26
Transmission Revenues27
 16
 15
Short-Term Wholesale Revenues104
 114
 92
Total Electric Wholesale Sales$167
 $158
 $133
Long-Term Wholesale Revenues increased by $8 million, or 29%, in 2015 compared with 2014 primarily due to new wholesale agreements partially offset by unfavorable wholesale market prices. Transmission Revenues increased by $11 million, or 69%, in 2015 compared with 2014 primarily due to a new long-term transmission agreement with UNS Electric related to Gila River and contract renewals resulting in favorable pricing.
Long-Term Wholesale Revenues increased by $2 million, or 8%, in 2014 compared with 2013 primarily due to favorable market prices for wholesale power. There were no significant changes in transmission revenues in 2014 compared to 2013.
The EPA has not yet indicatedmajority of revenues from short-term wholesale sales are related to ACC jurisdictional assets and are credited against the fuel and purchased power costs eligible for recovery in the PPFAC.
Other Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Springerville Units 3 and 4 Revenue (1)
$91
 $112
 $102
Other Revenue27
 29
 28
Total Other Revenue$118
 $141
 $130
(1)
Represents revenues and reimbursements from Tri-State, the lessee of Springerville Unit 3, and SRP, the owner of Springerville Unit 4, to TEP related to the operation of these plants.
In addition to reimbursements related to Springerville Units 3 and 4, TEP’s other revenues include inter-company revenues from its affiliates, UNS Gas, Inc., an indirect wholly-owned subsidiary of UNS Energy, (UNS Gas) and UNS Electric, for corporate services provided by TEP, and miscellaneous service-related revenues such as rent on power pole attachments, damage claims, and customer late fees. See Note 5 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding related party transactions.
There were no significant changes in Other Revenue in 2015 compared with 2014, as well as no significant changes in Other Revenue in 2014 compared with 2013.

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Operating Expenses
Generating Output and Fuel and Purchased Power Expense
TEP’s fuel and purchased power expense and energy resources for 2015, 2014, and 2013 are detailed below:
 Generation and Purchased Power (kWh) Fuel and Purchased Power Expense
(in millions)2015 2014 2013 2015 2014 2013
Coal-Fired Generation8,584
 9,271
 10,254
 $209
 $232
 $273
Gas-Fired Generation2,723
 1,210
 1,007
 91
 60
 46
Utility Owned Renewable Generation65
 48
 38
 
 
 
Reimbursed Fuel Expense for Springerville Units 3 and 4 (1)

 
 
 5
 5
 7
Total Generation11,372
 10,529
 11,299
 305
 297
 326
Total Purchased Power3,079
 3,195
 2,329
 125
 153
 112
Transmission and Other PPFAC Recoverable Costs
 
 
 25
 18
 12
Increase (Decrease) to Reflect PPFAC Recovery Treatment
 
 
 40
 (11) (12)
Total Generation and Purchased Power14,451
 13,724
 13,628
 $495
 $457
 $438
Less Line Losses and Company Use(719) (859) (885)      
Total Energy Sold13,732
 12,865
 12,743
      
(1)
Springerville Unit 3 and 4 Fuel Expense is reimbursed by Tri-State and SRP.
Fuel and Purchased Power Expense increased by $38 million, or 8%, in 2015 compared with 2014 primarily due to an increase in the PPFAC charge and additional generation and transmission costs associated with Gila River Unit 3. The increase was partially offset by favorable purchased power costs (see table below) and decreased coal generation at Springerville Unit 1 as a preferenceresult of the lease expiration in January 2015.
Fuel and Purchased Power Expense increased by $19 million, or 4%, in 2014 compared with 2013 primarily due to the increase in purchased power volumes resulting from outages at Springerville and Sundt generating stations in 2014. The increase was partially offset by a decrease in generation expense as a result of the outages.
See the table below for regulating CCRs. Each optioninformation on the average fuel cost of generated and purchased kWh:
(cents per kWh)2015 2014 2013
Coal2.44
 2.50
 2.66
Gas3.35
 4.99
 4.57
Purchased Power4.05
 4.79
 4.83
All Sources3.31
 3.64
 3.54
Operations and Maintenance Expense
The table below summarizes the items included in Operations and Maintenance (O&M) expense:
(in millions)2015 2014 2013
Reimbursed Expenses - Springerville Units 3 and 4 (1)
$65
 $84
 $70
Reimbursed Expenses - Customer Funded Renewable Energy and
DSM Programs (2)
25
 23
 26
Other Operating and Maintenance Expense (3)
255
 272
 239
Total Operations and Maintenance Expense$345
 $379
 $335
(1)
Expenses related to Springerville Units 3 and 4 are reimbursed with corresponding amounts recorded in other revenue.
(2)
These expenses are being collected from customers and the corresponding amounts are recorded in retail revenue.
(3)
The Third-Party Owners' share of expenses related to Springerville Unit 1 is included in Other Operating and Maintenance Expense.

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Operating and Maintenance expenses decreased by $34 million, or 9%, in2015 compared with 2014. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, decreased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense decreased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014, partially offset by higher O&M related to Gila River, labor costs and outside services.
Operating and Maintenance expenses increased by$44 million, or 13%, in 2014 compared with 2013. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, increased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense increased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014.

FACTORS AFFECTING RESULTS OF OPERATIONS
2015 Rate Case
In November 2015, TEP filed a general rate case with the ACC to: (i) update and improve its rate design and tariffs to provide more accurate price signals and a more equitable allocation of its fixed costs to its customers; (ii) provide TEP with an opportunity to recover its full cost of service, including an appropriate return on its rate base investments; and (iii) enable TEP to continue to provide safe and reliable service. The rate application is based on a test year ended June 30, 2015. The filing requests that new rates be implemented by January 1, 2017.
The key provisions of the rate case include:
a Base Rate increase of $110 million, or 12%, compared with adjusted test year revenues;
a 7.34% return on original cost rate base of $2.1 billion;
a capital structure for rate making purposes of approximately 50% common equity and 50% long-term debt;
a cost of equity of 10.35% and an average cost of debt of 4.32%;
a request to apply excess depreciation reserves against the unrecovered net book value (NBV) of San Juan Unit 2 and the Sundt Coal Handling Facilities due to early retirement;
a request for authority to begin using the Third-Party Owners' portion of Springerville Unit 1 that is available to TEP for dispatch to serve retail customer needs and to recover the related operating costs through the PPFAC; and
rate design changes that would allow CCRsreduce the reliance on volumetric sales to be beneficially reused or recycled as components of other products. We expect the EPA to issuerecover fixed costs, and a final rule in late 2014. new net metering tariff that would ensure that customers who install distributed generation pay an equitable price for their electric service.
TEP cannot predict the outcome of this matter.proceeding or whether its rate request will be adopted by the ACC in whole or in part.
Generating Resources
At December 31, 2015, approximately 49% of TEP's generating capacity was fueled by coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating additional steps to reduce its dependency on coal generation.
In August 2015, TEP exhausted its existing coal supply at Unit 4 of the H. Wilson Sundt Generating Station (Sundt Unit 4). Currently, TEP is operating Sundt Unit 4 on natural gas as a primary fuel source.
TEP's ability to further reduce its coal-fired generating capacity will depend on several factors, including, but not limited to:
The impact of the Clean Power Plan on current coal-fired generating facilities; and
The ability to resolve Springerville Unit 1 legal proceedings relating to the Third-Party Owners.
See Part I, Item 1. Business, General for additional information regarding TEP's generating facilities.

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Springerville Unit 1
TEP leased Unit 1 of the Springerville Generating Station and an undivided one-half interest in certain Springerville Common Facilities (collectively Springerville Unit 1) under seven separate lease agreements (Springerville Unit 1 Leases) that were accounted for as capital leases. The leases expired in January 2015. At that time, TEP purchased a leased interest comprising 24.8% of Springerville Unit 1, representing 96 MW of capacity, for an aggregate purchase price of $46 million. Following this purchase, TEP owns 49.5% of Springerville Unit 1, or 192 MW of capacity.
The remaining 50.5% of Springerville Unit 1, or 195 MW of capacity, is owned by Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the Third-Party Owners’ generating output. TEP is obligated to operate the unit for the Third-Party Owners. Owner Trustees and Co-Trustees are obligated to compensate TEP for their pro rata share of expenses for the unit. TEP estimates the Third-Party Owners’ share of 2016 operations and maintenance expense will be $27 million and their estimated share of 2016 capital expenditures will be $9 million.
In April 2015, TEP filed a demand for arbitration seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expense and capital expenditures for Springerville Unit 1. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part I, Item 3. Legal Proceedings for additional information regarding the legal proceedings relating to the Third-Party Owners.
Potential Plant Retirements
TEP's 2014 Integrated Resource Plan (IRP), which was acknowledged by the ACC in April 2015, reflected plans to reduce its overall coal capacity by 492 MW (32% of TEP's existing coal fleet) by 2018. TEP's 2014 IRP included retiring certain coal-fired generating facilities at San Juan Generating Station (San Juan) and coal handling facilities at the H. Wilson Sundt Generating Station (Sundt) earlier than their current estimated useful lives. These facilities currently do not have the requisite emission control equipment to meet proposed Environmental Protection Agency (EPA) regulations. TEP plans to seek regulatory recovery for amounts that would not otherwise be recovered if and when any assets are retired. TEP plans to file a preliminary IRP in March 2016 and is required to file its next IRP by April 2017.
See Part I, Item 1. Business, Environmental Matters for additional information regarding the impact of environmental matters on plant operations.
Springerville Coal Handling Facilities Capital Lease Purchase
TEP previously leased interests in the coal handling facilities at the Springerville Generating Station (Springerville Coal Handling Facilities) under two separate lease agreements (Springerville Coal Handling Facilities Leases). The lease agreements had an initial term that expired in April 2015 and provided TEP the option to renew the leases or to purchase the leased interests at the aggregate fixed price of $120 million. In April 2015, TEP exercised its option to purchase the facilities.
Upon the expiration of the lease term, TEP purchased an 86.7% undivided ownership interest in the Springerville Coal Handling Facilities bringing TEP's total ownership interest to 100%. With the completion of the purchase, SRP was obligated to buy a 17.05% undivided interest in the Springerville Coal Handling Facilities from TEP for approximately $24 million. This transaction was completed in May 2015. Tri-State, is obligated to either: 1) buy a 17.05% undivided interest in the facilities for approximately $24 million or 2) continue to make payments to TEP for the use of the facilities. Tri-State has until April 2016 to exercise its purchase option.
Sales to Mining Customers
TEP's largest mining customer is taking initial steps to curtail production in 2016 due to the decline in commodity prices. TEP cannot predict the extent to which this customer will curtail production, how long commodity prices will remain low, or the

25



total impact the prices will have on mining production in the future. At December 31, 2015, mining customers made up 8% of TEP's total electric sales.
The proposed Rosemont Copper Mine near Tucson, Arizona is in the permitting stage. If the Rosemont Copper Mine is constructed and reaches full production, it will become TEP's largest retail customer with an estimated load of approximately 85 to 120 MW.
Interest Rates
See Part II, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for information regarding interest rate risks and its impact on earnings.

UNS ELECTRICLIQUIDITY AND CAPITAL RESOURCES
SERVICE TERRITORY AND CUSTOMERSLiquidity
UNS Electric isCash flows may vary during the year, with cash flows from operations typically the lowest in the first quarter and highest in the third quarter due to TEP’s summer peaking load. As a vertically integrated electric utility company serving approximately 93,000 retail customersresult of the varied seasonal cash flow, we will use, as needed, our revolving credit facility to assist in Mohave and Santa Cruz counties. These countiesfunding business activities. We believe that we have a combined population of approximately 250,000. UNS Electric’s annual retail customer growth rate was less than 1% from 2010 through 2013. We estimate that UNS Electric’s retail customer base will increase by less than 1% in 2014. UNS Electric’s customer base is primarily residential, with some commercial and industrial customers. Peak demand for 2013 was 423 MW.
POWER SUPPLY AND TRANSMISSION
Purchased Energy
UNS Electric relies on a portfolio of long, intermediate, and short-term power purchasessufficient liquidity under our revolving credit facilities to meet customer load requirements.
Generating Resources
UNS Electric ownsshort-term working capital needs and operates Black Mountain Generating Station (BMGS), a 90 MW gas-fired facility located near Kingman, Arizona. In July 2011, UNS Electric purchased BMGS from UED. UNS Gas purchasesto provide credit enhancement as necessary under energy procurement and transports natural gas to BMGS for UNS Electric under long-term natural gas transportation and saleshedging agreements.

K-16


UNS Electric also owns and operates the Valencia Power Plant (Valencia), located in Nogales, Arizona. Valencia consists of four gas and diesel-fueled combustion turbine units and provides approximately 62 MW of peaking resources. The facility is directly interconnected with the distribution system serving the city of Nogales and the surrounding areas.
Renewable Energy Resources
Available Liquidity
(in millions)As of December 31, 2015
Cash and Cash Equivalents$56
Amount Available under Revolving Credit Facility (1)
250
Total Liquidity$306
(1)
TEP's revolving credit facility, which matures in 2020, provides for a $250 million revolving credit commitment with a LOC sublimit of $50 million.
Future Liquidity Requirements
We expect to meet all of our financial obligations and other anticipated cash outflows for the foreseeable future. These obligations and anticipated cash outflows include, but are not limited to, dividend payments, debt maturities, and obligations included in the Contractual Obligations and forecasted Capital Expenditures tablesbelow.
See Part III, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for additional information regarding TEP's market risks and Note 6of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's financing arrangements.
Summary of Cash Flow
The table below presents net cash provided by (used for) operating, investing and financing activities:
 Year Ended 
Increase
(Decrease)
 Year Ended 
Increase
(Decrease)
(in millions)2015 2014 Percent 2013 Percent
Operating Activities$365
 $314
 16.2 % $346
 (9.2)%
Investing Activities(503) (518) (2.9)% (260) 99.2 %
Financing Activities120
 253
 (52.6)% (141) 279.4 %
Net Increase (Decrease) in Cash(18) 49
 (136.7)% (55) 189.1 %
Cash, Beginning of Year74
 25
 196.0 % 80
 (68.8)%
Cash, End of Year$56
 $74
 (24.3)% $25
 196.0 %
Cash Flows for both 2015 and 2014 included unusually large capital expenditures. These capital requirements were met with a combination of equity contributions from UNS Electric agreed to purchase the output of a combined wind farmEnergy and solar generating facility located near Kingman. The above-market cost of energy purchased through the 20-year PPA will be recovered through the RES surcharge. For more information seelong-term borrowings as discussed in Rates and Regulation, Renewable Energy Standard and TariffFinancing Activities below.

Future Generating Resources
26



In 2015, we issued long-term debt and used the proceeds to repay revolving and term loans under our credit agreements and pay a portion of the purchase price for interests in the Springerville Coal Handling Facilities. In addition, we received an equity contribution from UNS Energy and used the proceeds to repay the outstanding balances under our revolving credit facilities and redeem long-term variable rate tax-exempt bonds which were called for redemption in June 2015.
In 2014, we received an equity contribution from UNS Energy and used the proceeds to pay for the purchase of both Gila River Generating Station Unit 3 and Springerville Unit 1 leased assets.
Operating Activities
2015 compared with 2014
In 2015, net cash flows from operating activities increased by $51 million compared to 2014 primarily due to:
$39 million of higher cash receipts from retail and wholesale sales, net of fuel and purchased power costs paid driven primarily by an increase in the average PPFAC rate; and
$34 million in lower cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition.
The increase in net cash flows from operating activities was partially offset by $16 million of higher cash paid for pension and retiree funding.
2014 compared with 2013
In 2014, net cash flows from operating activities decreased by $32 million compared to 2013 primarily due to:
$27 million of higher cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition; and
$6 million of higher cash paid for capital lease interest.
Investing Activities
2015 compared with 2014
In 2015, net cash flows used for investing activities decreased by $15 million compared with 2014 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.
The decrease in net cash flows used for investing activities was partially offset by:
$120 million purchase, in April 2015, of an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities partially offset by $24 million of cash received for the sale, in May 2015, of a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
$46 million purchase, in January 2015, of an additional 24.8% undivided ownership interest in Springerville Unit 1 increasing our total ownership interest to 49.5%;
$11 million in lower cash receipts for contributions in aid of construction received; and
$10 million of higher capital expenditures to fund system reinforcement through replacements and betterments.
2014 compared with 2013
In 2014, net cash flows used for investing activities increased by $258 million compared with 2013 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3;
$71 million of higher capital expenditures to fund the construction of new solar projects and improvements to our generating facilities; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.

27



Financing Activities
2015 compared with 2014
In 2015, net cash flows from financing activities decreased by $133 million compared with 2014 primarily due to:
$209 million in higher cash payments due to the purchase of $130 million in fixed rate tax-exempt long-term debt in January 2015, and the retirement of $79 million in variable rate tax-exempt bonds in August 2015;
$170 million in lower proceeds borrowed and higher repayments under TEP's revolving credit facilities;
$45 million in lower cash proceeds from UNS Energy's equity contributions; and
$10 million in higher cash dividend payments.
The decrease in net cash flows from financing activities was partially offset by:
$152 million in lower cash payments due to the expiration of capital lease obligations in 2015; and
$150 million in higher cash proceeds from the issuance of long-term debt, in February 2015.
2014 compared with 2013
In 2014, net cash flows from financing activities increased by $394 million compared with 2013 primarily due to:
$225 million in higher cash proceeds from UNS Energy's equity contributions made to complete the purchases for interest in Gila River Unit 3 and Springerville Unit 1;
$149 million in higher cash proceeds from the issuance of long-term debt; and
$85 million in higher cash borrowings (net of repayments) under TEP's revolving credit facilities.
The increase in net cash flows from financing activities was partially offset by $66 million in higher cash payments of capital lease obligations.
External Sources of Liquidity
Short-Term Investments
TEP’s short-term investment policy governs the investment of excess cash balances. We regularly review and update this policy in response to market conditions. At December 31, 2015, TEP's short-term investments included highly-rated and liquid money market funds.
Access to Revolving Credit Facilities
We have access to working capital through a revolving credit agreement with lenders. The 2015 Credit Agreement provides for a $250 million revolving credit commitment and LOC facility, due in October 2020. The LOC sublimit is $50 million. TEP expects that amounts borrowed under the credit agreement will be used for working capital and other general corporate purposes and that LOCs will be issued from time to time to support energy procurement and hedging transactions. No amounts were drawn under the 2015 Credit Agreement at December 31, 2015.
In June 2015, the 2014 Credit Agreement was terminated. In October 2015, the 2010 Credit Agreement was terminated.
For details on TEP's credit facilities see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Debt Financing
We use debt financing to lower our overall cost of capital. We are exposed to adverse changes in interest rates to the extent that we rely on variable rate financing. Our cost of capital is also affected by our credit ratings
In April 2015, we filed a financing application with the ACC. The application requests extending and expanding the existing financing authority to TEP by: (i) extending authority from December 2016 to December 2020; (ii) increasing the outstanding long-term debt limitation from $1.7 billion to $2.2 billion; (iii) allowing parent equity contributions of up to $400 million; and (iv) extending current interest rate hedging authority. The ACC issued an order granting such authority in January 2016.

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As discussed in Part I, Item 1A. Risk Factors of this Form 10-K, we may need to redeem or defease certain tax-exempt bonds outstanding. To the extent that is required, we would need to issue new taxable debt or enter into a new bank financing.
We have no new financing planned for 2016. TEP has, from time to time, refinanced or repurchased portions of its outstanding debt before scheduled maturity. Depending on market conditions, TEP may refinance other debt issuances or make additional debt repurchases in the future. For details on changes to or maturities on long-term debt, see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Debt Restrictive Covenants
The 2015 Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement contain pricing based on TEP’s credit ratings. A change in TEP’s credit ratings can cause an increase or decrease in the amount of interest TEP pays on its borrowings, and the amount of fees it pays for its LOCs and unused commitments. Also, under certain agreements, should TEP fail to maintain compliance with covenants, lenders could accelerate the maturity of all amounts outstanding. At December 31, 2015, TEP was in compliance with these covenants.
TEP conducts its wholesale marketing and risk management activities under certain master agreements whereby TEP may be required to post credit enhancements in the form of cash or a LOC due to exposures exceeding unsecured credit limits provided to TEP, changes in contract values, a change in TEP’s credit ratings, or if there has been a material change in TEP’s creditworthiness. As of December 31, 2015, TEP had posted less than $1 million in LOCs for credit enhancement with wholesale counterparties.
We do not have any provisions in any of our debt or lease agreements that would cause an event of default or cause amounts to become due and payable in the event of a credit rating downgrade.
Credit Ratings
Our credit ratings affect our access to capital markets and supplemental bank financing. At December 31, 2015, TEP’s credit ratings for senior unsecured debt were A3 from Moody’s and BBB+ from both Standard & Poor’s and Fitch. As of February 2016, at TEP's request for commercial reasons, Fitch withdrew its rating on TEP.
TEP's credit ratings are dependent on a number of factors, both quantitative and qualitative, and are subject to change at any time. The disclosure of these credit ratings is not a recommendation to buy, sell, or hold TEP securities. Each rating should be evaluated independently of any other ratings.
Dividends
TEP declared and paid $50 million in dividends to UNS Energy in 2015 and $40 million in 2014 and 2013.
The ACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and reported to the ACC annually beginning on April 1, 2016. As of December 31, 2015, TEP had not yet reached the 50 percent of total capital and was therefore still restricted by the condition contained in the ACC's approval order.
Capital Expenditures
TEP's routine capital expenditures include funds used for system reinforcement, replacements and betterments, and costs to comply with environmental rules and regulations. In 2015, total capital expenditures of $500 million, included the purchase of an undivided ownership interest in Springerville Unit 1 and the remaining ownership interest in the Springerville Coal Handling facilities. In 2014, total capital expenditures of $507 million, included the purchase of interest in Gila River Unit 3 and an undivided ownership interest in Springerville Unit 1. Construction for a new 500-kilovolt (kV) transmission line in Pinal County that began in December 2014 and concluded in late 2015, totaled $79 million.

29



With the exception of 2017, we expect capital requirements to remain stable from 2016 through 2020. TEP's forecasted capital expenditures are summarized below:
(in millions)2016 2017 2018 2019 2020
Generation Facilities:         
Environmental Compliance$39
 $27
 $11
 $2
 $2
Renewable Energy27
 27
 27
 27
 27
Springerville Common Lease Purchase
 38
 
 
 
Other Generation Facilities34
 82
 31
 36
 39
Total Generation Facilities100
 174
 69
 65
 68
Transmission and Distribution122
 112
 159
 154
 163
General and Other (1)
52
 46
 56
 57
 54
Total Capital Expenditures$274
 $332
 $284
 $276
 $285
(1)
General and Other primarily includes cost for information technology as well as fleet, facilities and communication equipment.
These estimates are subject to continuing review and adjustment. Actual capital expenditures may differ from these estimates due to changes in business conditions, construction schedules, environmental requirements, state or federal regulations and other factors. We expect to pay for forecasted capital expenditures with cash on hand, internally generated funds, and short-term revolver borrowings.
Contractual Obligations
The following chart displays TEP’s contractual obligations by maturity and by type of obligation as of December 31, 2015:
   Payments Due by Period
(in millions)Total Less than 1 Year 1-3 Years 3-5 Years More than 5 Years
Long-Term Debt
        
Principal (1)
$1,466
 $
 $100
 $117
 $1,249
Interest (2)
769
 59
 120
 116
 474
Capital Lease Obligations (3)
77
 17
 30
 30
 
Operating Leases: (4)

        
Land Easements and Rights-of-Way82
 1
 2
 2
 77
Operating Leases Other9
 1
 2
 2
 4
Purchase Obligations:
        
Fuel, Including Transportation (5)(6)
580
 78
 125
 90
 287
Purchased Power28
 28
 
 
 
Transmission38
 6
 12
 7
 13
Renewable Purchase Power Agreements (7)(8)
1,054
 61
 122
 121
 750
RES Performance-Based Incentives (9)
107
 8
 16
 16
 67
Acquisition of Springerville Common Facilities (10)
106
 
 38
 
 68
Other Long-Term Liabilities: (11) (12)

        
Restricted and Performance-Based Stock Units2
 
 2
 
 
Pension & Other Post Retirement Obligations (13)
77
 16
 11
 13
 37
Total Contractual Obligations$4,395
 $275
 $580
 $514
 $3,026
(1)
$37 million of TEP’s variable rate bonds are backed by an LOC issued pursuant to the 2010 Reimbursement Agreement, which expires in December 2019. Although the variable rate bond matures in 2032, the above table reflects a redemption or repurchase of such bond in 2019 as though the LOC terminates without replacement upon expiration of the 2010 Reimbursement Agreement. TEP's 2013 tax-exempt variable rate IDRBs, which have an aggregate principal amount of $100 million and mature in 2032, are subject to mandatory tender for purchase in 2018. Total long-term debt is not reduced by $11 million of related unamortized debt issuance costs or $3 million of unamortized original issue discount.

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(2)
Excludes interest on revolving credit facilities and includes interest on TEP's 2013 tax-exempt IDRBs through the end of the current five-year term.
(3)
Effective with commercial operation of Springerville Unit 3 in July 2006 and Unit 4 in December 2009, Tri-State and SRP began reimbursing TEP for various operating costs related to the common facilities on an ongoing basis. The common facilities included assets leased by TEP under the Springerville Common and Springerville Coal Handling Facilities Leases. Upon expiration of the Springerville Coal Handling Lease in April 2015, TEP purchased the interests in those assets. SRP then purchased an undivided interest in those coal handling assets from TEP. Tri-State and SRP each continue to reimburse TEP for their shares of common assets owned or leased by TEP. TEP was reimbursed for $11 million of operation costs in 2015, and absent a purchase of an interest in the coal handling facilities by Tri-State, will be reimbursed $10 million of operation costs in 2016. Capital Lease Obligations do not reflect any reduction associated with this reimbursement. Our capital lease obligation balances decline over time as scheduled capital lease payments are made by TEP.
(4)
TEP's operating lease expense is primarily for rail cars, office facilities, land easements, and rights-of-way with varying terms, provisions, and expiration dates.
(5)
Contemporaneously with the sale of SJCC's stock in January 2016, the existing coal sale agreement terminated and a new Coal Supply Agreement (CSA) became effective. The new CSA is between SJCC and PNM and continues through June 30, 2022. TEP is not a party to the new CSA, but has minimum purchase obligations under restructured ownership agreements at San Juan. Estimated future payments, not included in the table above, are $21 million in 2016, $23 million in 2017, $24 million in 2018 and 2019, $23 million in 2020, and $22 million through the end of the contract.
(6)
Excludes TEP’s liability for final environmental reclamation at the coal mines which supply the Navajo, San Juan and Four Corners generating stations as the timing of payment has not been determined. See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP’s share of reclamation costs.
(7)
TEP enters into long-term renewable power purchase agreements which require TEP to purchase 100% of certain renewable energy generation facilities output once commercial operation status is achieved. While TEP is not required to make payments under these contracts if power is not delivered, the table above includes estimated future payments based on expected power deliveries.
(8)
In February 2016, a facility achieved commercial operation status. The related contract expires in 2036. Estimated future payments, not included in the table above, are $3 million in each of 2016 through 2020 and $43 million through the end of the contract.
(9)
TEP has entered into REC purchase agreements to purchase the environmental attributes from retail customers with solar installations. Payments for the RECs are termed Performance-Based Incentives (PBIs) and are paid in contractually agreed upon intervals (usually quarterly) based on metered renewable energy production. PBIs are recoverable through the RES tariff. See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's RES tariff.
(10)
The Springerville Common Facilities Leases have an initial term to December 2017 for one lease and January 2021 for the other two leases, subject to optional renewal periods of two or more years through 2025. Instead of extending the leases, TEP may exercise its fixed-price purchase options.
(11)
Excludes asset retirement obligations of $33 million expected to occur through 2066.
(12)
Excludes unrecognized tax benefits of $5 million. At this time we are unable to make a reasonably reliable estimate of the timing of payments in individual years in connection with these tax liabilities.
(13)
These obligations represent TEP’s expected contributions to pension plans in 2016, expected benefit payments for its unfunded Supplemental Executive Retirement Plan (SERP), and expected retiree benefit costs to cover medical and life insurance claims as determined by the plans’ actuaries. Due to the significant impact that returns on plan assets and changes in discount rates might have on payment obligation amounts, other contributions are excluded beyond 2016.
We expect to pay for forecasted capital expenditures with cash on hand, internally generated funds, and short-term revolver borrowings.
Off Balance Sheet Arrangements
Other than the unrecorded contractual obligations in the table above, we do not have any arrangements or relationships with entities that are not consolidated into the financial statements.
Income Tax Position
Prior year tax legislation and the Consolidated Appropriations Act of 2016, include provisions that make qualified property placed in service between 2010 and 2019 eligible for bonus depreciation for tax purposes. In addition, the IRS issued new guidance related to the treatment of expenditures to maintain, replace, or improve property. These provisions are an acceleration of tax benefits TEP otherwise would have received over 20 years and have created net operating loss

31



carryforwards that can be used to offset future taxable income. As a result, TEP did not pay any federal or state income taxes in 2015 and does not expect to make any payments until 2020.
Environmental Matters
The EPA regulates the amount of sulfur dioxide (SO2), nitrogen oxide (NOx), carbon dioxide (CO2), particulate matter, mercury and other by-products produced by power plants. TEP may incur added costs to comply with future changes in federal and state environmental laws, regulations, and permit requirements at its power plants. Environmental laws and regulations are subject to a range of interpretations, which may ultimately be resolved by the courts. Because these laws and regulations continue to evolve, TEP is unable to predict the impact of the changing laws and regulations on its operations and consolidated financial results. Complying with these changes may reduce operating efficiency. TEP capitalized $33 million in 2015, $11 million in 2014, and $5 million in 2013 in costs to comply with environmental rules and regulations. In addition, we recorded O&M expenses of $6 million in 2015, $5 million in 2014, and $8 million in 2013. TEP expects to recover the cost of environmental compliance from its ratepayers.
Hazardous Air Pollutant Requirements
In February 2012, the EPA issued final rules for the control of mercury emissions and other hazardous air pollutants from power plants. Based on the EPA's final Mercury and Air Toxics Standards (MATS) rules, additional emission control equipment would have been required by April 2015. TEP, as operator of the Springerville and Sundt generating stations, and the operators of Navajo and Four Corners received extensions until April 2016 to comply with the MATS rules.
In June 2015, the U.S. Supreme Court reversed and remanded the D.C. Circuit Court of Appeals decision in Michigan v. EPA to uphold the MATS rules requiring power plants to control mercury and other emissions. The Supreme Court held that the EPA did not adequately consider “cost” before determining that MATS was “appropriate and necessary.” The D.C. Circuit Court of Appeals remanded the rules to the EPA for further consideration.
At this time, despite the U.S. Supreme Court ruling, the MATS rules remain in force and effect. TEP will proceed with its planned MATS compliance activity at each of our facilities. Additionally, Arizona has an Arizona-specific mercury rule in place that will become effective and applicable to our Arizona facilities in the event the Federal rule is struck down. Our compliance strategy is intended to ensure compliance with both the Federal and the State rule, as applicable.
TEP's share of the estimated mercury emission control costs to comply with the MATS rules includes the following:
(in millions)Navajo 
Springerville(1)
Capital Expenditures$1
 $5
Annual O&M Expenses$1
 $1
Compliance Year2016 2016
(1)
Total capital expenditures and annual O&M expenses represent amounts for Springerville Units 1 and 2, with estimated costs split equally between the two units. In January 2015, TEP completed the purchase of 24.8% of Springerville Unit 1, bringing its total ownership interest to 49.5%. With the completion of the purchase, the Third-Party Owners are responsible for 50.5% of environmental costs attributable to Springerville Unit 1. TEP will continue to be responsible for 100% of environmental costs attributable to Springerville Unit 2.
TEP expects no additional capital expenditures or O&M expenses will be incurred to comply with the MATS rules at Four Corners, Sundt, and San Juan Generating Stations.
Regional Haze Rules
The EPA's Regional Haze Rules require emission controls known as BART for certain industrial facilities emitting air pollutants that reduce visibility in national parks and wilderness areas. The rule calls for all states to establish goals and emission reduction strategies for improving visibility. States must submit these goals and strategies to the EPA for approval. Because Navajo and Four Corners are located on land leased from the Navajo Nation, they are not subject to state oversight; the EPA oversees regional haze planning for these power plants.
In the western U.S., Regional Haze BART determinations have focused on controls for NOx, often resulting in a requirement to install Selective Catalytic Reduction (SCR). Complying with the BART rule, and with other future environmental rules, may make it economically impractical to continue operating all or a portion of the Navajo, San Juan, and Four Corners power plants or for individual owners to continue to participate in these power plants. The BART provisions do not apply to Springerville Units 1 and 2 since they were constructed in the 1980s, after the time frame as designated by the rules. Other provisions of the

32



Regional Haze Rules requiring further emission reductions are not likely to impact Springerville operations until after 2018. TEP cannot predict the ultimate outcome of these matters.
TEP's estimated NOx emissions control costs involved in meeting these rules are:
(in millions)Navajo San Juan Four Corners Sundt
Capital Expenditures$28
 $12
 $44
 $12
Annual O&M Expenses$1
 $1
 $2
 $6
Compliance Year2030 2016 2018 2017
Navajo
In August 2014, the EPA published a final Federal Implementation Plan (FIP) which provides that one unit at Navajo will be shut down by 2020, SCR (or the equivalent) will be installed on the remaining two units by 2030, and conventional coal-fired generation will cease by December 2044. The final BART rule includes options that accommodate potential ownership changes at the plant. The plant has until December 2019 to notify the EPA of how it will comply with the FIP.
San Juan
In October 2014, the EPA published a final rule approving a revised State Implementation Plan (SIP) covering BART requirements for San Juan, which includes the closure of Units 2 and 3 by December 2017 and the installation of Selective Non-Catalytic Reduction (SNCR) on Units 1 and 4 by February 2016. TEP owns 50% of Units 1 and 2 at San Juan. The SIP approval references a New Source Review permit issued by the New Mexico Environment Department in November 2013 which, among other things, calls for balanced draft upgrades on San Juan Unit 1 to reduce particulate matter emissions. PNM, the operator of San Juan, is currently installing SNCR. Balanced draft modifications to San Juan Unit 1were completed in June 2015. TEP’s share of the balanced draft upgrades was approximately $22 million. In December 2015, PNM obtained New Mexico Public Regulation Commission approval to shut down Units 2 and 3 at San Juan.
At December 31, 2015, the net book value of TEP's share in San Juan Unit 2, including construction work in progress, was $104 million. Consistent with the 2013 Rate Order, TEP has requested authorization from the ACC to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case.
Four Corners
In December 2013, UNS Electric entered intoAPS, on behalf of the co-owners of Four Corners, notified the EPA that they have chosen an agreement to purchase 25% of Gila River Unitalternative BART compliance strategy; as a result, APS closed Units 1, 2, and 3 (137 MW) for approximately $55 million, with TEP purchasing the remaining 75% interest (413 MW). The purchase price is subject to adjustments to prorate certain fees and expenses through the closing and in respect of certain operational matters. TEP and UNS Electric may also modify the percentage ownership allocation between them. We expect the transaction to close in December 2014.2013 and agreed to the installation of SCR on Units 4 and 5 by July 2018. TEP owns 7% of Four Corners Units 4 and 5.
The purchaseSundt
In June 2014, the EPA issued a final rule that would require TEP to either: (i) install, by mid-2017, SNCR and dry sorbent injection if Unit 4 of a 25% interest of Gila River Unit 3 would be consistent with UNS Electric's strategy to reduce its reliance on wholesale market purchases to meet retail customer demand.
See TEP, Generating and Other Resources, Future Generating Resources, Gila Riverthe H. Wilson Sundt Generating Station Unit 3, (Sundt) continues to use coal as a fuel source; or (ii) permanently eliminate coal as a fuel source as a better-than-BART alternative by the end of 2017. Under the rule, TEP is required to notify the EPA of its decision by March 2017.
At December 31, 2015, the net book value of the Sundt coal handling facilities was $16 million. In August 2015, TEP exhausted its existing coal supply at Sundt and has been operating Sundt with natural gas as a primary fuel source. TEP expects to retire the Sundt coal handling facilities earlier than expected, and has requested to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case. The estimated NOabove,and xNote 8. emissions control costs in the table above will not be expended if Sundt's coal handling facilities are retired early.
Renewable Energy Resources
UNS ElectricThe ACC’s Renewable Energy Standard (RES) requires TEP, and other affected utilities, to increase their use of renewable energy each year until it represents at least 15% of their total annual retail energy requirements by 2025, with distributed generation accounting for 30% of the annual renewable energy requirement. Affected utilities must file an annual RES implementation plan for review and approval by the ACC. TEP plans to meet this requirement through a combination of owned resources and Power Purchase Agreements (PPAs). See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Rates and Regulations below for additional information regarding RES.
Owned Renewable Resources
As of December 31, 2015, TEP owned 46 MW of photovoltaic (PV) solar generating capacity. In 2016, TEP plans to complete an additional solar project adding 5 MW of PV solar generating capacity. The solar generating facilities are located on properties held under easements and leases. In December 2015, TEP also acquired a 5 MW concentrated solar project which does not increase capacity but displaces the equivalent amount of steam produced by burning fossil fuel.
Renewable Power Purchase Agreements
As of December 31, 2015, TEP has renewable PPAs for 175 MW of capacity measured in direct current (DC) from solar resources, 80 MW of capacity measured in alternating current (AC) from wind resources and 4 MW of capacity measured in AC from a landfill gas generation plant. The solar PPAs contain options that allow TEP to purchase all or part of the related project at a future period.
Power Purchases
TEP purchases power from other utilities and power marketers. TEP may enter into contracts to purchase: (i) energy under long-term contracts to serve retail load and long-term wholesale contracts; (ii) capacity or energy during periods of planned outages or for peak summer load conditions; and (iii) energy for resale to certain wholesale customers under load and resource management agreements.
TEP typically uses generation from its gas-fired units, supplemented by power purchases, to meet the summer peak demands of its retail customers. Some of these power purchases are price-indexed to natural gas. Due to its increasing seasonal gas and purchased power usage, TEP hedges a portion of its total natural gas exposure with fixed price contracts for a maximum of three years. TEP also purchases energy in the daily and hourly markets to meet higher than anticipated demands, to cover unplanned generation outages, or when doing so is more economical than generating its own energy.

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TEP is a member of a regional reserve-sharing organization and has reliability and power sharing relationships with other utilities. These relationships allow TEP to call upon other utilities during emergencies, such as plant outages and system disturbances, and reduce the amount of reserves TEP is required to carry.
PEAK DEMAND AND FUTURE RESOURCES
Peak Demand
(in MW)2015 2014 2013 2012 2011
Retail Customers2,222
 2,218
 2,230
 2,290
 2,334
Firm Sales to Other Utilities638
 673
 484
 286
 322
Coincident Peak Demand (A)2,860
 2,891
 2,714
 2,576
 2,656
          
Total Generating Resources2,452
 2,240
 2,240
 2,267
 2,262
Other Resources (1)
913
 932
 775
 683
 1,009
Total TEP Resources (B)3,365
 3,172
 3,015
 2,950
 3,271
Total Margin (B) – (A)505
 281
 301
 374
 615
Reserve Margin (% of Coincident Peak Demand)18% 10% 11% 15% 23%
(1)
Other Resources include firm power purchases and interruptible retail and wholesale loads.
The chart above shows the relationship over a five-year period between peak demand and energy resources. Total margin is the difference between total energy resources and coincident peak demand, and the reserve margin is the ratio of margin to coincident peak demand. The reserve margin in 2015 was in compliance with reliability criteria set forth by the Western Electricity Coordinating Council, a regional council of North American Reliability Corporation (NERC).
Peak demand occurs during the summer months due to the cooling requirements of retail customers. Retail peak demand varies from year-to-year due to weather, economic conditions, and other factors. Retail peak demand has primarily declined over the five-year period due to weak economic conditions and the implementation of energy efficiency programs and distributed generation.
Forecasted retail peak demand for 2016 is 2,109 MW compared with actual peak demand of 2,222 MW in 2015. TEP’s 2016 estimated retail peak demand is based on weather patterns observed over a 10-year period and other factors, including estimates of customer usage and planned curtailment of mining customers. TEP believes existing generation capacity and PPAs are sufficient to meet expected demand in 2016 and established reserve margin criteria.
Future Resources
At December 31, 2015, approximately 49% of TEP's generating capacity was fueled by coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating additional steps to reduce its dependency on coal generation while still meeting its peak load requirements. In August 2015, TEP exhausted its existing coal supply at Unit 4 of the H. Wilson Sundt Generating Station (Sundt Unit 4). TEP expects to invest approximately $7continue operating Sundt Unit 4 on natural gas as a primary fuel source.
See Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, Factors Affecting Results of Operations for additional information regarding TEP's generating facilities.

6



FUEL SUPPLY
Fuel and Purchased Power Summary
Resource information is provided below:
 Average Cost per kWh (cents per kWh) Percentage of Total kWh Resources
 2015 2014 2013 2015 2014 2013
Coal2.44
 2.50
 2.66
 60% 68% 75%
Gas3.35
 4.99
 4.57
 19% 9% 8%
Purchased Power4.05
 4.79
 4.83
 21% 23% 17%
All Sources3.31
 3.64
 3.54
 100% 100% 100%
Coal
The coal used for electric generation is low-sulfur, bituminous or sub-bituminous coal from mines in Arizona and New Mexico. The table below provides information on the existing coal contracts that supply our generating stations. The average cost of coal per million metric British thermal unit (MMBtu), including transportation, was $2.34 in 2015, $2.43 in 2014, and $2.57 in company-owned solar PV capacity. See Note 3.2013.
Transmission
Station Coal Supplier 2015 Coal
Consumption
(tons in 000s)
 
Contract
Expiration
 
Avg.
Sulfur
Content
 Coal Obtained From
Springerville (1)
 Peabody CoalSales 2,676 2020 1.0% Lee Ranch Mine/El Segundo Mine
Four Corners (2)
 BHP Billiton 378 2031 0.7% Navajo Mine
San Juan (3)
 San Juan Coal Co. 1,079 2022 0.8% San Juan Mine
Navajo Peabody CoalSales 510 2019 0.6% Kayenta Mine
(1)
Peabody has a pending sale of the Lee Ranch Mine/El Segundo Mine to Bowie Resources Partners.
(2)
Beginning in July 2016 through June 2031, the coal for Four Corners will be purchased from the Navajo Transitional Energy Company (NTEC). NTEC purchased the mine located near Four Corners from BHP Billiton and will begin overseeing the mine operation in 2016.
(3)
BHP Billiton sold San Juan Coal Co. to Westmoreland Coal Company, effective January 31, 2016.
TEP Operated Generating Facilities
UNS Electric importsThe coal supplies for Springerville Units 1 and 2 are transported approximately 200 miles by railroad from northwestern New Mexico. TEP expects coal reserves to be sufficient to supply the estimated requirements for Springerville Units 1 and 2 for their estimated remaining lives.
TEP no longer uses coal as a primary fuel source for Sundt Unit 4.
Coal Generating Facilities Operated by Others
TEP also participates in jointly-owned coal-fired generating facilities at the Four Corners Generating Station (Four Corners), the Navajo Generating Station (Navajo), and the San Juan Generating Station (San Juan). Four Corners, which is operated by Arizona Public Service Company (APS), and San Juan, which is operated by Public Service Company of New Mexico (PNM), are mine-mouth generating stations located adjacent to the coal reserves. Navajo, which is operated by SRP, obtains its coal supply from the nearby Kayenta coal mine and receives deliveries on a dedicated electric rail delivery system. Effective January 31, 2016, Westmoreland Coal Company purchased San Juan Coal Company (SJCC) from BHP Billiton and has also agreed to a new coal supply agreement extending through June 30, 2022. TEP expects coal reserves available to these three jointly-owned generating facilities to be sufficient for the remaining lives of the stations.
Natural Gas Supply
TEP uses generation from its facilities fueled by natural gas, in addition to energy from its coal-fired facilities and purchased power, generated at BMGSto meet the summer peak demands of its retail customers and local reliability needs. The average cost of natural gas per MMBtu, including transportation, was $3.49 in 2015, $5.17 in 2014, and $4.55 in 2013.

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TEP purchases capacity from El Paso Natural Gas (EPNG) for transportation from the San Juan and Permian Basins to its Sundt plant under firm transportation agreements. TEP also purchases firm gas transportation for Gila River Unit 3 from EPNG and Transwestern Pipeline Co., and for Luna Generating Station (Luna) from EPNG. TEP purchases gas from Southwest Gas Corporation under a retail tariff for North Loop’s 94 MW of internal combustion turbines and receives distribution service under a transportation agreement for DeMoss Petrie, a 75 MW internal combustion turbine.
TRANSMISSION AND DISTRIBUTION
TEP's transmission system is part of the Western Interconnection, which includes the interconnected transmission systems of 14 western states, two Canadian provinces and parts of Mexico. TEP's transmission system, together with contractual rights on other transmission systems, enables TEP to integrate and access generation resources to meet its customer load requirements. TEP's transmission and distribution systems included approximately 2,170 miles of transmission lines, and 7,557 miles of distribution lines as of December 31, 2015.
In 2015, TEP completed construction and placed into its Mohave County service territory over Western Area Power Administration’s (WAPA)a 500-Kilo-volt (kV) transmission lines. UNS Electric hasline extending from the Pinal Central substation to TEP’s Tortolita substation northwest of Tucson. The transmission service agreements with WAPA for itsline was built to provide additional transmission capacity that expire in June 2016.
UNS Electric importsfrom the power generated at ValenciaPalo Verde area into its Santa Cruz CountyTEP’s northern service territory over its own transmission lines.
Tucson to Nogales 138kV Transmission Line
UNS Electric completed construction of a 138kV transmission line from Tucson to Nogales at the end of 2013. This project replaces a 115kV transmission line that previously linked UNS Electric's load to the WAPA system. The new transmission line now connects UNS Electric's load in Nogales directly to TEP’s high voltage transmission system. The connection to TEP’s system eliminates a requirement to run local generation in Nogales that was required due to limitations on the WAPA system.territory.
RATES AND REGULATION
2013 UNS ElectricThe ACC and the FERC each regulate portions of the utility accounting practices and rates of TEP. The ACC regulates rates charged to retail customers, the siting of generation and transmission facilities, the issuance of debt, transactions with affiliated parties, and other utility matters. The ACC also enacts other regulations and policies that can affect business decisions and accounting practices. The FERC regulates terms and prices of transmission services and wholesale electricity sales.
2015 Rate OrderCase
In December 2013,November 2015, TEP filed a general rate case with the ACC issued an order (2013 UNSErequesting a Base Rate Order) that resolved theincrease of $110 million and various rate case filed by UNSEdesign changes. See Note 2 of Notes to Consolidated Financial Statements in December 2012, which was based on a test year ended June 30, 2012. The 2013 UNSE Rate Order approved a $3 million non-fuel base rate increaseItem 8 of this From 10-K and a new rate structure effective January 1, 2014. See Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, UNS Electric, Factors Affecting Results of Operations 2013 UNS Electricfor key provisions regarding the 2015 Rate Order.Case.
Purchased Power and Fuel Adjustment Clause
The PPFAC, which is reset monthly,Purchased Power and Fuel Adjustment Clause (PPFAC) allows UNS ElectricTEP to recover its fuel, transmission, and purchased power costs, including demand charges, broker fees, and the prudent costs of contracts for hedging fuel and purchased power costs for its retail customers. The PPFAC consists of a forward component and a true-up component.
IfThe true-up component reconciles any over/under collected amounts from the preceding 12-month period and is credited to or recovered from customers in the subsequent year.
TEP’s PPFAC bank balance becomes over collected by more than $10 million, UNS Electric must file for a PPFAC rate adjustment also includes the recovery of the following costs and/or justify why an adjustment is not necessarycredits: lime costs used to control sulfur dioxide (SO2) emissions at this time. UNS Electric can request a surcharge to recover costs if

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the PPFAC bank balance is under-collected. proceeds from the sale of SO2 allowances.
At December 31, 2013, the PPFAC bank balance was2015, TEP had over-collected fuel and purchased power costs by $14 million on a billed-to-customer basis. See Note 3.

$18 million.
Renewable Energy StandardStandards and Tariff
As partThe ACC’s RES requires TEP and other affected utilities to increase their use of a rate order issuedrenewable energy each year until it represents at least 15% of their total annual retail energy requirements in 2010,2025, with distributed generation accounting for 30% of the ACC authorized UNS Electric to recover operating costs, depreciation, property taxes,annual renewable energy requirement. Affected utilities must file an annual RES implementation plan for review and a return on its investment in company-owned solar projectsapproval by the ACC. The approved cost of carrying out those plans is recovered from retail customers through the RES fundssurcharge until thesesuch costs are reflected in itsTEP’s Base Rates. The associated lost revenues attributable to meeting distributed generation targets will be partially recovered through the Lost Fixed Cost Recovery Mechanism (LFCR). See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
In October 2013,July 2015, TEP submitted its application for the ACC approved UNS Electric's 20142016 RES implementation plan. Underplan that includes a budget of $57 million, which will be partially offset by applying approximately $9 million of previously recovered carryover funds. TEP proposed to recover $48 million through the plan, UNS ElectricRES surcharge. The budget will collect approximately $6 million from customers during 2014 to fund the following: the above market cost of renewable energy purchases; previously awarded performance-based incentives for customer installed distributed generation; depreciation and a return on and of UNS Electric'sTEP's investments in company-owned solar projects; and various other program costs. The plan includes approval forTEP expects to receive a UNS Electric investment

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decision on the application in the first half 2016. TEP expects to recognize approximately $9 million of $7 millionrevenue in 2014 for2016 as a return on company-owned solar projects.
The percentage of retail kilowatt-hour (kWh) sales attributable to the 2015 RES renewable energy requirement was 8.6%, exceeding the overall 2015 requirement of 5.0%. TEP expects to meet the 2016 RES renewable energy requirement of 6.0% of retail kWh sales. Compliance is determined through the ACC's review of TEP's annual RES implementation plan. As TEP no longer pays incentives to obtain distributed generation Renewable Energy Credits (REC), which are used to demonstrate compliance with the distributed generation requirement, TEP has requested a waiver of the RES distributed generation requirements in its 2016 RES implementation plan.
Energy Efficiency Standards
In 2010, the ACC approved new Energy Efficiency Standards (EE Standards) designed to require electric utilities to implement cost-effective programs to reduce customers' energy consumption. The EE Standards require increasing cumulative annual targeted retail kWh savings equal to 22% by 2020. Since the implementation of the Electric EE Standards, in 2010, UNS Electric savedTEP’s cumulative annual energy equal tosavings are approximately 4.7%9.3% of retail kWh sales. See TEP, Rates and Regulation, Electric Energy Efficiencysales in 2015. Compliance with the EE Standards above.
The 2013 UNS Electric Rate Order approved a LFCR mechanism that will allow UNS Electric to recover certain non-fuel costs that would otherwise go unrecovered due to reduced kWh sales attributed to is determined through the ACC's review of the company's annual energy efficiency programs and distributed generation. See Item. 7-Management’s Discussion and Analysis of Financial Condition and Results of Operations, UNS Electric, Factors Affecting Results of Operations, 2013 UNS Electric Rate Order.implementation plan.
In December 2013,February 2016, the ACC approved UNS Electric’s 2013-2014TEP’s 2016 energy efficiency implementation plan. Under the 2016 plan, TEP has been approved to recover approximately $14 million from retail customers and will offer customers new and existing DSM programs. Energy Efficiency implementation plan that included a 2014 calendar year budget to fundsavings realized through the programs that support the ACC’s Electricwill count toward Arizona’s EE Standards as well as a new performance incentive.and the associated lost revenue will be partially recovered through the LFCR. See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.

ENVIRONMENTAL MATTERS
UNS Electric isThe EPA regulates the amount of SO2, nitrogen oxide (NOx), carbon dioxide (CO2), particulate matter, mercury and other by-products produced by power plants. TEP may incur added costs to comply with future changes in federal and state environmental laws, regulations, and permit requirements at its power plants. Environmental laws and regulations are subject to a range of interpretations, which may ultimately be resolved by the courts. Because these laws and regulations continue to evolve, TEP is unable to predict the impact of the changing laws and regulations on its operations and consolidated financial results. TEP expects to recover the cost of environmental regulationcompliance from its ratepayers.
National Ambient Air Quality Standards
In October 2015, the EPA released the final rule for the 8-hour Ozone NAAQS or Ozone Standard. The EPA lowered the standard from 75 parts per billion (ppb) to 70ppb. If Pima County does not meet the standard, the county will be designated as a “non-attainment” area and will need to develop a plan to bring the air-shed into compliance. A “non-attainment” designation may slow economic growth in the region and impact our ability to site new local generation.
Implementation of the rule is scheduled as follows:
States’ recommendation of area designations (attainment, non-attainment, or unclassified) by October 2016.
EPA's response to states’ designation recommendation by June 2017.
EPA's finalization of area designations by October 2017, based on 2014-2016 air quality data.
Effluent Limitation Guidelines
In September 2015, as part of the Clean Water Act the EPA published the final Effluent Limitation Guidelines setting technology standards and water quality, resource extraction, waste disposal, and land use bylimitations for steam electric power plant discharges. The rule sets the first federal state, and local authorities. UNS Electric believeslimits on the levels of toxic metals in wastewater that can be discharged from power plants, based on technology improvements in the steam electric power industry over the last three decades. TEP is evaluating the effects of this rule on its facilities including Navajo, San Juan, and Four Corners. Since the majority of TEP's facilities are zero discharge, TEP does not anticipate a significant financial impact.
TEP believes it is in substantialmaterial compliance with all existing regulationsapplicable laws and will be in compliance with expected environmental regulations. SeeNote 7Refer to .

UNS GAS
SERVICE TERRITORY AND CUSTOMERS
UNS Gas is a gas distribution company serving approximately 150,000 retail customers in Mohave, Yavapai, Coconino, Navajo, and Santa Cruz counties in Arizona. These counties comprise approximately 50% of the territory in the state of Arizona, with a population of approximately 700,000. UNS Gas’ customer base is primarily residential. Sales to residential customers provided approximately 61% of total revenues in 2013.
UNS Gas’ annual retail customer growth rate was less than 1% from 2010 through 2013. In 2014, we expect UNS Gas’ retail customer base to increase by less than 1%.
GAS SUPPLY AND TRANSPORTATION
UNS Gas directly manages its gas supply and transportation contracts. The market price for gas varies based upon the period during which the commodity is purchased and is affected by weather, production issues, the economy, and other factors. UNS Gas hedges its gas supply prices by entering into physical fixed price forward agreements and financial contracts in order to provide more stable prices to its customers. These purchases are made up to three years in advance with the goal of hedging at least 60% of the price of expected monthly gas consumption. UNS Gas hedged approximately 65% of its expected monthly consumption for the 2013/2014 winter season (November through March). Additionally, UNS Gas has approximately 60% of its expected gas consumption hedged for April through October 2014, and 40% hedged for the 2014/2015 winter season.
UNS Gas buys most of the gas it distributes from the San Juan Basin. The gas is delivered on the El Paso Natural Gas (EPNG) and Transwestern Pipeline Company (Transwestern) interstate pipeline systems under firm transportation agreements with combined capacity sufficient to meet UNS Gas’ customers’ demands.

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UNS Gas has average capacity rights of approximately 655,000 therms per day on the EPNG pipeline system, with an average of 1,095,000 therms per day in the winter season (November through March) to serve its service territories. UNS Gas has average capacity rights of 230,000 therms per day on the San Juan Lateral and Mainline of the Transwestern pipeline. The Transwestern pipeline principally delivers gas to the portion of UNS Gas’ distribution system serving customers in Flagstaff and Kingman.
UNS Gas has a separate agreement with Transwestern for transportation capacity rights on the Phoenix Lateral Extension Line that expires in 2024. UNS Gas’ average daily capacity right is 126,000 therms per day, with an average of 222,000 therms per day in the winter season.
See Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, UNS Gas, Environmental Laws and Regulations of this Form 10-K for additional information related to environmental laws and regulations impacting TEP's liquidity and capital resources and Liquidity and Capital Resources Contractual Obligations.
RATES AND REGULATION
2012 UNS Gas Rate Order
In April 2012, the ACC approved a Base Rate increase of $2.7 million as well as a partial decoupling mechanism to recover lost fixed cost revenues as a result of implementing the Gas Energy Efficiency Standards (Gas EE Standards). See Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations, UNS Gas, Factors Affecting Results of Operations, 2012 UNS Gas Rate Order.
Purchased Gas Adjustor
The PGA mechanism is intended to address the volatility of natural gas prices and allow UNS Gas to recover its actual commodity costs, including transportation, through a price adjustor. The difference between UNS Gas’ actual monthly gas and transportation costs and the rolling 12-month average cost of gas and transportation is deferred and recovered or returned to customers through the PGA mechanism.
At any time UNS Gas’ PGA balancing account, called the PGA bank balance, is under-recovered, UNS Gas may request a PGA surcharge with the goal of collecting the amount deferred from customers over a period deemed appropriate by the ACC. When the PGA bank balance reaches an over-collected balance of $10 million on a billed-to-customer basis, UNS Gas is required to make a filing with the ACC to determine how the over-collected balance should be returned to customers.
In October 2013, the ACC approved an increase to the existing customer PGA credit from 4.5 cents per therm to 10 cents per therm in order to reduce the over-collected PGA bank balance. The PGA credit will be effective for the period November 1, 2013 through April 30, 2014. At December 31, 2013, the PGA bank balance was over-collected by $10 million on a billed-to-customer basis.
Gas Energy Efficiency Standards and Decoupling
In 2010, the ACC approved Gas EE Standards which are designed to require UNS Gas and other affected utilities to implement cost-effective DSM programs. The Gas EE standards require increasing annual targeted retail therm savings equal to 6% by 2020. Since the implementation of the Gas EE Standards in 2010, UNS Gas’ customers have saved cumulative energy equal to approximately 0.5% of total retail therm sales.
New and existing DSM programs, renewable energy technology that displaces gas, and certain energy efficient building codes are acceptable means to meet the Gas EE Standards. The Gas EE Standards provide for the recovery of costs incurred to implement DSM programs. UNS Gas’ DSM programs and rates charged to retail customers for these programs are subject to ACC approval.
In June 2013, the ACC approved the UNS Gas 2011-2012 Gas Energy Efficiency implementation plan with modifications and amendments. The approval included an annual energy efficiency budget of approximately $2 million and a waiver of the Gas EE Standards through 2013.
ENVIRONMENTAL MATTERS
UNS Gas is subject to environmental regulation of air and water quality, resource extraction, waste disposal, and land use by federal, state, and local authorities. UNS Gas’ facilities are in substantial compliance with existing regulations.

TEP's forecasted environmental-related capital expenditures.

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EMPLOYEES (At
At December 31, 2013)
2015, TEP had 1,3981,478 employees, of which approximately 678688 were represented by the International Brotherhood of Electrical Workers (IBEW) Local No. 1116. A new collective bargaining agreement between the IBEW and TEP was entered into in January 20132016 and expires in January 2016.
UNS Electric had 143 employees, of which 27 employees were represented by the IBEW Local No. 387 and 87 employees were represented by the IBEW Local No. 769. The existing agreements with the IBEW Local No. 387 and No. 769 expire in February 2017 and June 2016, respectively.
UNS Gas had 188 employees, of which 109 employees were represented by IBEW Local No. 1116 and 5 employees were represented by IBEW Local No. 387. The agreements with the IBEW Local No. 1116 and No. 387 expire in June 2015 and February 2017, respectively.
SES had 248 employees, of which 216 are represented by IBEW Local No. 1116 and 19 by IBEW Local No. 570. These agreements expire in December 2014 and May 2016, respectively.

EXECUTIVE OFFICERS OF THE REGISTRANTS
Executive Officers – UNS Energy and TEP
Executive Officers of UNS Energy and TEP, who are elected annually by UNS Energy’s Board of Directors and TEP’s Board of Directors, are as follows:
Name Age Position(s) Held 
Executive
Officer Since
Paul J. Bonavia 62
 Chairman and Chief Executive Officer 2009
David G. Hutchens 47
 President and Chief Operating Officer 2007
Kevin P. Larson 57
 
Senior Vice President and Chief Financial Officer(1)
 2000
Philip J. Dion III 45
 Senior Vice President, Public Policy and Customer Solutions 2008
Kentton C. Grant 55
 
Vice President, Finance and Rates(2)
 2007
Todd C. Hixon 47
 Vice President and General Counsel 2011
Karen G. Kissinger 59
 Vice President and Chief Compliance Officer 1991
Mark C. Mansfield 58
 Vice President, Energy Resources 2012
Frank P. Marino 49
 Vice President and Controller 2013
Thomas A. McKenna 65
 Vice President, Energy Delivery 2007
Catherine E. Ries 54
 Vice President, Human Resources and Information Technology 2007
Herlinda H. Kennedy 52
 Corporate Secretary 2006
(1)Mr. Larson is also Treasurer at UNS Energy.
(2)Mr. Grant is also Treasurer at TEP.

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Paul J. BonaviaMr. Bonavia has served as Chairman and Chief Executive Officer of UNS Energy and TEP since January 2009. He also served as President from January 2009 to December 2011. Prior to joining UNS Energy, Mr. Bonavia served as President of the Utilities Group of Xcel Energy. Mr. Bonavia previously served as President of Xcel Energy’s Commercial Enterprises business unit and President of the company’s Energy Markets unit.
David G. HutchensMr. Hutchens has served as President and Chief Operating Officer of UNS Energy and TEP since August 2013. In December 2011 Mr. Hutchens was named President of UNS Energy and TEP. In March 2011, Mr. Hutchens was named Executive Vice President of UNS Energy and TEP. In May 2009, Mr. Hutchens was named Vice President of Energy Efficiency and Resource Planning. In January 2007, Mr. Hutchens was elected Vice President of Wholesale Energy at UNS Energy and TEP. Mr. Hutchens joined TEP in 1995.
Kevin P. LarsonMr. Larson has served as Senior Vice President and Chief Financial Officer of UNS Energy and TEP since September 2005. Mr. Larson is also Treasurer of UNS Energy. Mr. Larson joined TEP in 1985 and thereafter held various positions in its finance department and investment subsidiaries. He was elected Treasurer in August 1994 and Vice President in March 1997. In October 2000, he was elected Vice President and Chief Financial Officer.
Philip J. Dion IIIMr. Dion has served as Senior Vice President, Public Policy and Customer Solutions of UNS Energy and TEP since August 2013. Mr. Dion was named Vice President, Public Policy in April 2010. Mr. Dion joined UNS Energy in February 2008 as Vice President of Legal and Environmental Services. Prior to joining UNS Energy, Mr. Dion was chief of staff and chief legal advisor to Commissioner Marc Spitzer of the FERC. Mr. Dion previously worked in various roles at the ACC, including as an administrative law judge and as an advisor to Mr. Spitzer, prior to his appointment to the FERC.
Kentton C. GrantMr. Grant has served as Vice President of Finance and Rates of UNS Energy and TEP since January 2007. Mr. Grant also serves as Treasurer of TEP. Mr. Grant joined TEP in 1995.
Todd C. HixonMr. Hixon has served as Vice President and General Counsel of UNS Energy and TEP since May 2011. Mr. Hixon joined TEP’s legal department in 1998 and served in a variety of capacities, most recently serving as Associate General Counsel.
Karen G. KissingerMs. Kissinger has served as Vice President and Chief Compliance Officer of UNS Energy and TEP since August 2013. Ms. Kissinger served as Vice President, Controller, and Chief Compliance Officer from 2001 to 2013. Ms. Kissinger joined TEP as Vice President and Controller in January 1991.
Mark C. MansfieldMr. Mansfield has served as Vice President, Energy Resources since 2012. He joined the company in 2008, most recently serving as Senior Director of Generation. Prior to joining TEP, Mr. Mansfield held various leadership positions at PacifiCorp Energy from 1992-2008.
Frank P. MarinoMr. Marino has served as Vice President and Controller of UNS Energy and TEP since August 2013.  Mr. Marino joined UNS Energy as Assistant Controller in January 2013.  Prior to joining UNS Energy, he served various roles at the AES Corporation, a global power company. In 2012 he served as AES' Vice President for Business Demand and Outsourcing Management, and from 2007-2011 he served as Chief Financial Officer for two different business units.
Thomas A. McKennaMr. McKenna has served as Vice President, Energy Delivery since August 2013. Mr. McKenna was named Vice President, Engineering in January 2007. Mr. McKenna joined Nations Energy Corporation (a then wholly-owned subsidiary of Millennium) in 1998.
Catherine E. RiesMs. Ries has served as Vice President, Human Resources and Information Technology, since May 2013. Ms. Ries joined UNS Energy and TEP as Vice President of Human Resources in June 2007. Prior to joining UNS Energy, Ms. Ries worked for Clopay Building Products, a division of Griffon Corporation, from 2000 to 2007, and held the position of Vice President of Human Resources.
Herlinda H. KennedyMs. Kennedy has served as Corporate Secretary of UNS Energy and TEP since September 2006. Ms. Kennedy joined TEP in 1980 and was named assistant Corporate Secretary in 1999.
2019.

SEC REPORTS AVAILABLE ON UNS ENERGY’STEP'S WEBSITE
UNS Energy and TEP makemakes available theirits annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports as soon as reasonably practical after theywe electronically file them with, or furnish them to the Securities and Exchange Commission (SEC). These reports are available free of charge through UNS Energy’sTEP’s website address: http://www.uns.com. A link from UNS Energy’s website to these SEC reports is accessible as follows: At the UNS Energy main page, select Investors from the menu shownaddress at the top of the page; next select SEC filings from the menu shown on the Investor Relations page. www.tep.com/about/investors/.
UNS Energy’s code of ethics, which applies to the Board of Directors and all officers and employees of UNS Energy and its subsidiaries, including TEP, and any amendments or any waivers made to the code of ethics, is also available on UNS Energy’s website.TEP’s website at www.tep.com/about/investors/.

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UNS Energy and TEP areis providing the address of UNS Energy’sTEP’s website solely for the information of investors and dodoes not intend the address to be an active link. Information contained at UNS Energy’sTEP’s website is not part of, or incorporated by reference into, any report or other filing filed with the SEC by UNS Energy or TEP.

ITEM 1A. RISK FACTORS
The business and financial results of UNS Energy and TEP are subject to a number of risks and uncertainties, including those set forth below and in other documents we file with the SEC.below. These risks and uncertainties fall primarily into sixfive major categories: the proposed Merger, revenues, regulatory, environmental, financial, and operational.
RISKS RELATED TO THE PROPOSED MERGER WITH FORTIS
The Proposed Merger with Fortis May Not Be Completed.
The proposed Merger with Fortis requires approval by UNS Energy shareholders, the FERC, the Committee on Foreign Investment in the United States, and the ACC. Such approvals may not be obtained. For example, the ACC may not approve the Merger or may seek to impose conditions on the completion of the transaction, which could cause the conditions to the Merger to not be satisfied or which could delay or increase the cost of the transaction. In addition, the occurrence of a material adverse effect or the failure to satisfy other closing conditions could result in a termination of the Merger Agreement by Fortis.
Termination Fee
UNS Energy will be obligated to reimburse up to $12.5 million of Fortis' expenses if (i) Fortis or UNS Energy terminates the Merger Agreement because the acquisition has not been completed by December 11, 2014 (which may be extended under certain circumstances) or Fortis terminates the Merger Agreement based on a breach of the Merger Agreement by UNS Energy, and (ii) a competing proposal has been made or publicly disclosed and not withdrawn prior to the termination of the Merger Agreement or applicable breach. In addition, if within twelve months after such termination, a definitive agreement providing for an acquisition transaction is entered into, or an acquisition transaction is consummated by UNS Energy with, the person who made the acquisition proposal prior to such termination or applicable breach or with any other third party making an acquisition proposal within three months following such termination, UNS Energy will be obligated to pay Fortis a termination fee of approximately $64 million (less any expense reimbursement previously paid). In no event will more than one termination fee be payable.
Access to Capital and Market Value of UNS Energy Common Stock
Failure to complete the Merger could: (i) affect the value of UNS Energy’s common stock, including by reducing it to a level at or below the trading range preceding the announcement of the Fortis transaction; and (ii) negatively affect our access to and cost of both equity and debt financing.
REVENUES
National and local economic conditions can negatively affect on the results of operations, net income, and cash flows at TEP, UNS Electric, and UNS Gas.TEP.
Economic conditions have contributed significantly to a reduction in TEP’s retail customer growth and lower energy usage by the company’s residential, commercial, and industrial customers. As a result of weak economic conditions, TEP’s average retail customer base grew by less than 1% in each year from 20092011 through 20132015 compared with average increases of approximately 2%1% in each year from 20042005 to 2008. In 2013, total retail kWh sales were 0.2% above 2012 levels.2009. TEP estimates that a 1% change in annual retail sales could impact pre-tax net income and pre-tax cash flows by approximately $6 million.
Similar impacts were felt at UNS Electric and UNS Gas. Annual average increases in the number of retail customers at both companies remained below 1% in 2009 through 2013 compared with average annual growth rates of 3% from 2004 to 2008. We estimate that a 1% change in annual retail sales at UNS Electric and UNS Gas could impact pre-tax net income and pre-tax cash flows by approximately $1 million.
New technological developments and compliance with the implementation of new Energy EfficiencyACC's EE Standards and RES will continue to have a significant impact on retail sales, which could negatively impact UNS Energy’sTEP’s results of operations, net income, and cash flows.
Research and development activities are ongoing for new technologies that produce power or reduce power consumption. These technologies include renewable energy, customer-owned generation, and appliances, equipment, and equipment. TEP and UNS

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Electric also are promoting DSM programs designed to help customers reduce their energy use, and these efforts will increase significantly under energy efficiency rules approved in 2010 by the ACC. Furthercontrol systems. Continued development and use of these technologies and implementation of these rules would negativelycompliance with the ACC's EE Standards could further impact the results of operations, net income, and cash flows of TEP and UNS Electric.TEP.
The revenues, results of operations, and cash flows of TEP UNS Electric, and UNS Gas are seasonal, and are subject to weather conditions and customer usage patterns, which are beyond the companies’company’s control.
TEP typically earns the majority of its operating revenue and net income in the third quarter because retail customers increase their air conditioning usage during the summer. Conversely, TEP’s first quarter net income is typically limited by relatively mild winter weather in its retail service territory. UNS Electric’s earnings follow a similar pattern, while UNS Gas’ sales peak in the winter during home heating season. Cool summers or warm winters may reduce customer usage, at all three companies, adversely affecting operating revenues, cash flows, and net income by reducing sales.
TEP and UNS Electric areis dependent on a small segment of large customers for future revenues. A reduction in the electricity sales to these customers would negatively affect our results of operations, net income, and cash flows.
TEP and UNS Electric sellsells electricity to mines, military installations, and other large industrial customers. In 2013,2015, 35% of TEP’s retail kWh sales and 14% of UNS Electric’s retail kWh sales, were to 592 industrial and mining customers. Retail sales volumes and revenues from these customer classes could

10



decline as a result of, among other things: global, national, and local economic conditions; curtailments of customer operations due to declines in commodity prices; decisions by the federal government to close military bases; the effects of energy efficiency and distributed generation; or the decision by customers to self-generate all or a portion of thetheir energy needs. A reduction in retail kWh sales to TEP’s and UNS Electric’s large customers would negatively affect our results of operations, net income, and cash flows.
REGULATORY
TEP UNS Electric, and UNS Gas areis subject to regulation by the ACC, which sets the companies’company’s Retail Rates and oversees many aspects of theirits business in ways that could negatively affect the companies’company’s results of operations, net income, and cash flows.
The ACC is a constitutionally created body composed of five elected commissioners. Commissioners are elected state-wide for staggered four-year terms and are limited to serving a total of two terms. As a result, the composition of the commission, and therefore its policies, are subject to change every two years.
TEP’s Retail Rates consist of Base Rates and various rate adjustors that allow for timely recovery of certain costs between rate cases. The ACC is charged with setting retail electric and gas ratesRetail Rates that provide utility companies with an opportunityallow TEP to recover theirits costs of service and an opportunity to earn a reasonable rate of return. As part of the ACC’s process of establishing the retail electric and gas rates charged by TEP, UNS Electric and UNS Gas,In setting TEP’s Retail Rates, the ACC could disallow the recovery of certain costs such as: (i)or not provide for the write-downtimely recovery of assets due to changes in federal regulations or due to applicable accounting rules; or (ii) any other expenses the ACC determines were not prudently incurred.costs. The decisions made by the ACC on such matters impact the net income and cash flows of TEP, UNS Electric, and UNS Gas.TEP.
Changes in federal energy regulation may negatively affect the results of operations, net income, and cash flows of TEP, UNS Electric, and UNS Gas.TEP.
TEP UNS Electric, and UNS Gas areis subject to the impact of comprehensive and changing governmental regulation at the federal level that continues to change the structure of the electric and gas utility industries and the ways in which these industries are regulated. UNS Energy’s electric utility subsidiaries areTEP is subject to regulation by the FERC. The FERC has jurisdiction over rates for electric transmission in interstate commerce and rates for wholesale sales of electric power, including terms and prices of transmission services and sales of electricity at wholesale prices.wholesale.
As a result of the Energy Policy Act of 2005, owners and operators of bulk power transmission systems, including TEP, are subject to mandatory transmission standards developed and enforced by NERC and subject to the oversight of the FERC. Compliance with modified or new transmission standards may subject TEP to higher operating costs and increased capital costs. Failure to comply with the mandatory transmission standards could subject TEP to sanctions, including substantial monetary penalties.
ENVIRONMENTAL
UNS Energy’s utility subsidiaries areTEP is subject to numerous environmental laws and regulations that may increase theirits cost of operations or expose themit to environmentally-related litigation and liabilities. Many of these regulations could have a significant impact on TEP due to its reliance on coal as its primary fuel for energyelectric generation.

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Numerous federal, state, and local environmental laws and regulations affect present and future operations. Those laws and regulations include rules regarding air emissions, water use, wastewater discharges, solid waste, hazardous waste, and management of coal combustion residuals.
These laws and regulations can contribute to higher capital, operating, and other costs, particularly with regard to enforcement efforts focused on existing power plants and new compliance standards related to new and existing power plants. These laws and regulations generally require us to obtain and comply with a wide variety of environmental licenses, permits, authorizations, and other approvals. Both public officials and private individuals may seek to enforce applicable environmental laws and regulations. Failure to comply with applicable laws and regulations may result in litigation, and the imposition of fines, penalties, and a requirement by regulatory authorities for costly equipment upgrades by regulatory authorities.upgrades.
We cannot provide assurance that existingExisting environmental laws and regulations will notmay be revised or thatand new environmental laws and regulations will notmay be adopted or become applicable to our facilities. Increased compliance costs or additional operating restrictions from revised or additional regulation could have an adverse effect on our results of operations, particularly if those costs are not fully recoverable from our customers. TEP’s obligation to comply with the EPA’s BARTBest Available Retrofit Technology (BART) determinations as a participant in the San Juan, Four Corners, and Navajo plants, coupled with the financial impact of future climate change legislation, other environmental regulations and other business considerations, could jeopardize the economic viability of these plants or the ability of individual participants to meet their obligations and willingness to continue their participation in these plants. TEP cannot predict the ultimate outcome of these matters.
TEP also is contractually obligated to pay a portion of the environmental reclamation costs incurred at generating stations in which it has a minority interest and is obligated to pay similar costs at the mines that supply these generating stations. While TEP has recorded the portion of its costs that can be determined at this time, the total costs for final reclamation at these sites are unknown and could be substantial.

New federal
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Federal regulations to limitlimiting greenhouse gas emissions require a shift in generation from coal to natural gas and renewable generation and could increase TEP’sTEP's cost of operations and result in a change in the composition of TEP’s coal-dominated generating fleet.operations.
Based on the finding byIn August 2015, the EPA in December 2009 that emissions of greenhouse gases endanger public health and welfare,issued the agency is in the process of regulating greenhouse gas emissions. In addition, there are proposals and ongoing studies at the state, federal, and international levels to address global climate change that could also result in the regulation of CO2 and other greenhouse gases. Any future regulatory actions taken to address global climate change represent a business risk to our operations. In 2013, 80% of TEP’s total energy resources came from its coal-fueled generating facilities.
Reductions inClean Power Plan (CPP) limiting CO2 emissions from existing and new fossil fueled power plants. The CPP establishes state-level CO2 emission rates and mass-based goals that apply to fossil fuel-fired generation. The plan requires CO2 emission reductions for existing facilities by 2030 and establishes interim goals that begin in 2022. The CPP will require a shift in generation from coal to natural gas and renewables and could lead to the levels specifiedearly retirement of coal generation in Arizona within the 2022 to 2030 compliance time-frame. TEP will continue to work with the other Arizona and New Mexico utilities, as well as the appropriate regulatory agencies, to develop compliance strategies. TEP is unable to determine how the final CPP rule will impact its facilities until the plans are developed and approved by some proposalsthe EPA.
Early closure of TEP's coal-fired generation plants resulting from environmental regulations could be materially adverse to our financial position or resultsresult in TEP recognizing impairments in respect of such plants and increased cost of operations if recovery of our remaining investments in such plants and the costs associated costswith such early closures were not permitted through rates charged to customers.
TEP's coal-fired generating stations may be required to be closed before the end of controltheir useful lives in response to recent or limitation cannot be recovered from customers. Any future legislation orchanges in environmental regulation, addressing climate change could produce a number of other results including costly modificationspotential regulation relating to or reexaminationgreenhouse gas emissions. If any of the economic viabilitycoal-fired generation plants, or coal handling facilities, from which TEP obtains power are closed prior to the end of our existingtheir useful life, TEP could be required to recognize an impairment of its assets and incur added expenses relating to accelerated depreciation and amortization, decommissioning, reclamation and cancellation of long-term coal plants; changescontracts of such generating plants and facilities. Closure of any of such generating stations may force TEP to incur higher costs for replacement capacity and energy. TEP may not be permitted full recovery of these costs in the overall fuel mixrates it charges its customers. As of ourDecember 31, 2015, approximately 49% of TEP's generating fleet; or additional costs to fund energy efficiency activities. The impact of legislation or regulation to address global climate change would depend on the specific terms of those measures and cannot be determined at this time.capacity is fueled by coal.
FINANCIAL
The Third-Party Owners of Springerville Unit 1 have and may continue to refuse to pay some, or all, of their pro-rata share of the costs and expenses associated with SpringervilleUnit 1.
TEP owns 49.5% of Springerville Unit 1 and two separate third-parties own the remaining 50.5%. Starting in January 2015, TEP is obligated to operate Springerville Unit 1 for these Third-Party Owners under existing agreements. TEP and the Third-Party Owners disagree on several key aspects of these agreements, including the allocation of Springerville Unit 1 operating and maintenance expenses, capital improvement costs, and transmission rights. In addition, since late 2014 the Third-Party Owners have filed separate complaints at the FERC, in New York State court, and with the American Arbitration Association that include allegations that TEP violated certain provisions of the governing agreements in relation to TEP’s operation of Springerville Unit 1. Because of these disagreements and the pending litigation, the Third-Party Owners have and may continue to refuse to pay some or all of their pro-rata share of such Springerville Unit 1 costs and expenses. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016. The Third-Party Owners’ share of estimated 2016 operations and maintenance costs for Springerville Unit 1 is approximately $27 million and their share of estimated 2016 capital expenditures is approximately $9 million.
Volatility or disruptions in the financial markets, or unanticipated financing needs, could: increase our financing costs; limit our access to the credit markets; affect our ability to comply with financial covenants in our debt agreements; and increase our pension funding obligations. Such outcomes may adversely affect our liquidity and our ability to carry out our financial strategy.
We rely on access to the bank markets and capital markets as a significant source of liquidity and for capital requirements not satisfied by the cash flow from our operations. Market disruptions such as those experienced in 2008 and 2009 in the United States and abroad may increase our cost of borrowing or adversely affect our ability to access sources of liquidity needed to finance our operations and satisfy our obligations as they become due. These disruptions may include turmoil in the financial services industry, including substantial uncertainty surrounding particular lending institutions and counterparties we do business with, unprecedented volatility in the markets where our outstanding securities trade, and general economic downturns in our utility service territories. If we are unable to access credit at competitive rates, or if our borrowing costs dramatically increase, our ability to finance our operations, meet our short-term obligations, and execute our financial strategy could be adversely affected.
Changing market conditions could negatively affect the market value of assets held in our pension and other retiree plans and may increase the amount and accelerate the timing of required future funding contributions.

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UNS Energy’sPlant closings or changes in power flows into our service territory could require us to redeem or defease some or all of the tax-exempt bonds issued for our benefit. This could result in increased financing costs.
TEP has financed a substantial portion of utility plant assets with the proceeds of pollution control revenue bonds and industrial development revenue bonds issued by governmental authorities. Interest on these bonds is, subject to certain exceptions, excluded from gross income for federal tax purposes. This tax-exempt status is based, in part, on continued use of the assets for pollution control purposes or the local furnishing of energy within TEP’s two-county retail service area.
As of December 31, 2015, there were outstanding approximately $309 million aggregate principal amount of tax-exempt bonds that financed pollution control facilities at TEP’s generating units. Should certain of TEP’s generating units be retired and dismantled prior to the stated maturity dates of the related tax-exempt bonds, it is possible that some or all of the bonds financing such facilities would be subject to mandatory early redemption by TEP. Of the total amount outstanding, $37 million of the principal amount of the bonds can currently be redeemed at par upon notice to holders, and $272 million principal amount of the bonds have early redemption dates or final maturities ranging from 2019 to 2022.
In addition, as of December 31, 2015, there were outstanding approximately $307 million aggregate principal amount of tax-exempt bonds that financed local furnishing facilities. Depending on changes that may occur to the regional generation mix in the desert southwest, to the regional bulk transmission network, or to the demand for retail energy in TEP’s local service area, it is possible that TEP would no longer qualify as a local furnisher of energy within the meaning of the Internal Revenue Code. In recent years, reductions in retail demand in the winter months have made it increasingly difficult for TEP to continue to qualify as a local furnisher of electricity. If TEP could no longer qualify as a local furnisher of energy, all of TEP’s tax-exempt local furnishing bonds would be subject to mandatory early redemption by TEP or defeasance to the earliest possible redemption date. Of the total tax-exempt local furnishing bonds outstanding, $100 millionof the principal amount of the bonds can currently be redeemed at par upon notice to holders, and $207 million principal amount of the bonds have early redemption dates ranging from 2020 to 2023.
TEP’s net income and cash flows can be adversely affected by rising interest rates.
At December 31, 2013,2015, TEP had $215$137 million of tax-exempt variable rate debt obligations, $50 million of which was hedged with a fixed-for-floating interest rate swap through September 2014.obligations. The interest rates are set weekly or monthly. The average weekly interest rates (including Letters of Credit (LOCs) and remarketing fees) ranged from 0.93% - 1.42% in 2015. The average monthly interest rates ranged from 0.06% to 0.48% in 2013.0.79% - 0.87%. A 100 basis point increase in the average interest rates on this debt over a twelve-month period would increase TEP’s interest expense by approximately $2$1 million.
UNS Energy, TEP UNS Electric, and UNS Gasis also are subject to risk resulting from changes in the interest rate on theirits borrowings under revolving credit facilities. Revolving creditthe 2015 Credit Agreement. Such borrowings may be made on a spread over London Interbank Offer Rate (LIBOR) or an Alternate Base Rate. Each of these agreements is a committed facility and expires in November 2016.
If capital market conditions result in risingshort-term interest rates rise, the resulting increase in the cost of variable rate borrowings would negatively impact our results of operations, net income, and cash flows.
The expected purchase of Gila River and certain of Likewise, if capital market conditions result in higher long-term interest rates, TEP’s leased assets, as well as the cost of significant investments in TEP’s transmission system could require significant outlays of cash, which could be difficultborrowing costs would increase on any new long-term debt needed to finance.
During 2013, TEP notified certain owner participants and their lessors that TEP elected to purchase their undivided ownership interests in Springerville Unit 1 upon the expiration of the lease term in January 2015. In total, TEP elected to purchase leased interests comprising 35.4% of Springerville Unit 1, representing 137 MW of capacity. In December 2014 and January 2015, TEP will be required to fund the purchase price of $65 million.
The Springerville Coal Handling Facilities can be purchased in April 2015 for a fixed price of $120 million. TEP also leases a 50% undivided interest in Springerville Common Facilities with primary lease terms ending in 2017 and 2021. Upon expiration of the Springerville Coal Handling and Common Facilities Leases (whether at the end of the initial term or any renewal term), TEP has the obligation under agreements with the owners of Springerville Units 3 and 4 to purchase such facilities. Upon acquisition by TEP, the owner of Springerville Unit 3 has the option and the owner of Springerville Unit 4 has the obligation to purchase from TEP a 14% interest in the Common Facilities and a 17% interest in the Coal Handling Facilities.
In December 2013, TEP and UNS Electric entered into a purchase agreement to acquire Unit 3 of the Gila River Generating Station (Gila River Unit 3). Gila River Unit 3 is a gas-fired combined cycle unit with a capacity rating of 550 MW. The transaction is expected to close in late 2014, upon which TEP and UNS Electric will be required to fund the purchase amount of $219 million.
In 2014 and 2015, TEP’sfinance capital expenditures relatedor to investments in its high voltage transmission system are expected to be $147 million.
Debt levels, liquidity, regulatory rules, and other restrictions could limit the ability of TEP, UNS Electric, and UNS Gas to make distributions to UNS Energy.
As a holding company, UNS Energy has no operations of its own and derives all of its revenues and cash flow from its subsidiaries. TEP, UNS Electric, and UNS Gas could experience reduced levels of liquidity, or face other restrictions, which could adversely impact their ability to pay dividends to UNS Energy.
The debt levels at TEP, UNS Electric, and UNS Gas:
require UNS Energy's subsidiaries to dedicate a substantial portion of their cash flow to pay principal and interest on their debt, which could reduce the funds available for working capital, capital expenditures, acquisitions, and other general corporate purposes; and
could limit their ability to borrow additional amounts for working capital, capital expenditures, acquisitions, dividends, debt service requirements, execution of their business strategy, or other purposes.
TEP, UNS Electric, and UNS Gas may be required to post margin under their power and fuel supply agreements which could negatively impact their liquidity. The agreements under which we contract for power and fuel include requirements to post credit enhancement in the form of cash or letters of credit (LOCs) under certain circumstances, including changes in market prices which affect contract values, or a change in creditworthiness of the respective companies. In order to post such credit enhancement, TEP, UNS Electric, and UNS Gas would have to use available cash, draw under their revolving credit agreements, or issue LOCs under their revolving credit agreements.

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Regulatory rules and other restrictions include:
TEP's, UNS Electric's, and UNS Gas' inability to lend to affiliates without ACC approval; and
TEP, UNS Electric, and UNS Gas must be in compliance with their respective debt agreements to make dividend payments to UNS Energy.refinance existing long-term debt.
OPERATIONAL
The operation of electric generating stations, and transmission and distribution systems, involves risks that could result in reduced generating capability or unplanned outages that could adversely affect TEP’s or UNS Electric’s results of operations, net income, and cash flows.
The operation of electric generating stations, and transmission and distribution systems, involves certain risks, including equipment breakdown or failure, fires, weather, and other hazards, interruption of fuel supply, and lower than expected levels of efficiency or operational performance. Unplanned outages, including extensions of planned outages due to equipment failure or other complications, occur from time to time and are an inherent risk of our business. If TEP’s or UNS Electric’s generating stations and transmission and distribution systems operate below expectations, TEP or UNS Electric’sTEP’s operating results could be adversely affected.
The lack of access to sufficient supplies of wateraffected and/or TEP's capital spending could have a material adverse impact on TEP’s business and results of operations.
Natural gas and coal-fired generating plants require continuous water supply for their operation.  The region in which our power plants are located is prone to drought conditions, which could potentially affect the plants’ water supplies.  Any material reduction in the water supply for such facilities would limit the ability of TEP and UNS Electric to produce and market electricity from such facilities and could have a material adverse impact on our results of operations. Further, any change in regulations or the level of regulation with regard to use, treatment and discharge of water, or the licensing of water rights in the jurisdictions where TEP and UNS Electric operate, could have a material adverse impact on our results of operations.be increased.
TEP receives power from certain generating facilities that are jointly owned and operated by third parties. Therefore, TEP may not have the ability to affect the management or operations at such facilities which could adversely affect TEP’s results of operations, net income, and cash flows.
Certain of the generating stations from which TEP receives power are jointly owned with, or are operated by, third parties. TEP may not have the sole discretion or any ability to affect the management or operations at such facilities. As a result of this reliance on other operators, TEP may not be able to ensure the proper management of the operations and maintenance of the plants. Further, TEP may have no ability or a limited ability to make determinations on how best to manage the changing regulations which may

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affect such facilities. In addition, TEP will not have sole discretion as to how to proceed in the face of requirements relating to environmental compliance which could require significant capital expenditures or the closure of such generating stations. A divergence in the interests of TEP and the co-owners or operators, as applicable, of such generating facilities could negatively impact the business and operations of TEP.
The nature of our gas operations presents inherent risks of loss that could adversely affect our results of operations.
The operation of UNS Gas’ transmission and distribution systems involves certain risks, including gas leaks, fires, natural disasters, catastrophic accidents, explosions, pipeline ruptures, and other hazards and risks that may cause unforeseen interruptions, personal injury, or property damage. Any such incident could have an adverse effect on UNS Gas.
We may be subject to physical and/or cyber attacks.
As operators of critical energy infrastructure, we may face a heightened risk of physical and/or cyber attacks.attacks on our electric systems. Our electric generation, transmission, and distribution assets and systems may be vulnerableare geographically dispersed and are often in rural or unpopulated areas which make them especially difficult to disability or failures as a result of physical or cyber acts of war or terrorism, vandalism or other causes.
Our corporateadequately detect, defend from, and information technology systems may be vulnerablerespond to unauthorized access due to hacking, viruses, acts of war or terrorism, and other causes. In addition, our utility business requires access to sensitive customer data, including personal and credit information, in the ordinary course of business.such attacks.
If, despite our security measures, a significant physical attack or cyber breach occurred, we could have our operations disrupted, property damaged, and customer information stolen; experience substantial loss of revenues, response costs, and

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other financial loss; and be subject to increased regulation, litigation, and damage to our reputation, any of which could have a negative impact on our business and results of operations.
TEP or UNS Electric might not be able to secure adequate right-of-way to construct transmission lines and distribution-related facilities, and could be required to find alternate ways to provide adequate sources of energy and maintain reliable service for their customers.
TEP and UNS Electric rely on federal, state, and local governmental agencies to secure right-of-way and siting permits to construct transmission lines and distribution-related facilities. If adequate right-of-way and siting permits to build new transmission lines cannot be secured, TEP and UNS Electric may need to rely on more costly alternatives to provide energy to their customers, may not be able to maintain reliability in their service areas, or their ability to provide electric service to new customersWe may be negatively impacted.subject to cyber attacks.
We may face a heightened risk of cyber attacks. Our information and operations technology systems may be vulnerable to unauthorized access due to hacking, viruses, acts of war or terrorism, and other causes. Our operations technology systems have direct control over certain aspects of the electric system and, in addition, our utility business requires access to sensitive customer data, including personal and credit information, in the ordinary course of business.
If, despite our security measures, a significant cyber breach occurred, we could have our operations disrupted, property damaged, and customer information stolen; experience loss of revenues, response costs, and other financial loss; and be subject to increased regulation, litigation, and damage to our reputation, any of which could have a negative impact on our business and results of operations.

ITEM 1B. UNRESOLVED STAFF COMMENTS
None.

ITEM 2. – PROPERTIES
TEP PROPERTIES
Transmission facilities owned by TEP and by third parties are located in Arizona and New Mexico and transmit the output from TEP’s remote electric generating stations at Four Corners, Navajo, San Juan, Springerville, Gila River, and Luna to the Tucson area for use by TEP’s retail customers. The transmission system is interconnected at various points in Arizona and New Mexico with other regional utilities. TEP has arrangements with approximately 140 companies to interchange generation capacity and transmission of energy. See Part I, Item 1. Business, TEP, Generating and Other Resources.General for additional information regarding the transmission facilities.
At December 31, 2013, TEP owned or participated in an overhead electric transmission and distribution system consisting of:
564 circuit-miles of 500-kV lines;
1,088 circuit-miles of 345-kV lines;
413 circuit-miles of 138-kV lines;
481 circuit-miles of 46-kV lines; and
2,605 circuit-miles of lower voltage primary lines.
TEP’s underground electric distribution system includes 4,442 cable-miles of lines. TEP owns approximately 77% of the poles on which its lower voltage lines are located. Electric substation capacity consists of 104 substations with a total installed transformer capacity of 14,879,950 kilovolt amperes.
TheTEP's electric generating stations (except as noted below), administrative headquarters, warehousewarehouses and service centercenters are located on land owned by TEP. The electric distribution and transmission facilities owned by TEP are located:
on property owned by TEP;
under or over streets, alleys, highways, and other places in the public domain, as well as in national forests and state lands, under franchises, easements, or other rights which are generally subject to termination;
under or over private property as a result of easements obtained primarily from the record holder of title; or
over American Indian reservations under grant of easement by the Secretary of the Interior or lease by American Indian tribes.
It is possible that some of the easements, and the property over which the easements were granted, may have title defects or liens existing at the time the easements were acquired.
Springerville is located on property held by TEP under a long-term surface ownership agreementterm patent with the State of Arizona. TEP, under separate sale and leaseback arrangements, leases a 50% undivided interest in the Springerville Common Facilities (which do not include land).
Four Corners and Navajo are located on properties held under easements from the United States and under leases from the Navajo Nation. TEP, individually and in conjunction with PNM in connection with San Juan, has acquired land rights,

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easements and leases for the plant, transmission lines and a water diversion facility located on land owned by the Navajo

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Nation. TEP also has acquired easements for transmission facilities related to San Juan, Four Corners, and Navajo acrosslocated on reservation lands of the Zuni, Navajo, and Tohono O’dham American Indian Reservations.O’odham Nations. TEP, in conjunction with PNM and Freeport McMoRan,Samchully Power & Utilities 1 LLC, holds an undivided ownership interest in the property on which Luna is located.
TEP’s rights under these various easements and leases may be subject to defects such as:
possible conflicting grants or encumbrances due to the absence of, or inadequacies in, the recording laws or record systems of the Bureau of Indian Affairs (BIA) and the American Indian tribes;
possible inability of TEP to legally enforce its rights against adverse claimants and the American Indian tribes without Congressional consent; or
failure or inability of the American Indian tribes to protect TEP’s interests in the easements and leases from disruption by the U.S. Congress, Secretary of the Interior, or other adverse claimants.
These possible defects have not interfered, and are not expected to materially interfere, with TEP’s interest in and operation of its facilities.
Under separate ground lease agreements, TEP under separate sale and leaseback arrangements, leasesleased parcels of land for the following photovoltaic facilities:
The Solar Zone of the University of Arizona Tech Park in Pima County, Arizona; and
Bright Tucson Community Solar Blocks in Pima County, Arizona.
In December 2014, TEP placed in service an additional photovoltaic facility in Cochise County, Arizona, for which TEP entered into a 30-year easement agreement. The easement is to facilitate the operations of a solar photovoltaic renewable energy generation facilities (which do not include land):system on behalf of the Department of the Army, located at Fort Huachuca in Cochise County.
Springerville Coal Handling Facilities;See Item 1. Business, General for additional information regarding generating facilities.
a 50% undivided interest in the Springerville Common Facilities; and
ITEM 3. LEGAL PROCEEDINGS
Springerville Unit 1 Proceedings
Upon the termination of the Springerville Unit 1 Leases on January 1, 2015, 50.5% of Springerville Unit 1, or 195 MW of capacity, continued to be owned by third parties, Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the Third-Party Owners’ Springerville Unit 1 power.
Commencing on January 1, 2015, with the termination of the leases, TEP is obligated to operate the unit for the Third-Party Owners under existing agreements. In 2014, TEP and the remaining 50% undivided interestThird-Party Owners engaged in discussions regarding the post-lease operation of Springerville Unit 1 and related cost sharing arrangements, but did not reach agreement on several key points.
In November 2014, the Springerville Unit 1 Third-Party Owners filed a complaint (FERC Action) against TEP at the FERC alleging that TEP had not agreed to wheel power and energy for the Third-Party Owners in the manner specified in the existing Springerville Common Facilities.Unit 1 facility support agreement between TEP and the Third-Party Owners and for the cost specified by the Third-Party Owners. The Third-Party Owners requested an order from the FERC requiring such wheeling of the Third-Party Owners’ energy from their Springerville Unit 1 interests beginning in January 2015 to the Palo Verde switchyard and for the price specified by the Third-Party Owners. In February 2015, the FERC issued an order denying the Third-Party Owners complaint. In March 2015, the Third-Party Owners filed a request for rehearing in the FERC Action, which the FERC denied in October 2015. In December 2015, the Third-Party Owners appealed the FERC’s order denying the Third-Party Owners' complaint to the U.S. Court of Appeals for the Ninth Circuit. In December 2015, TEP filed an unopposed motion to intervene in the Ninth Circuit appeal.
On December 19, 2014, the Third-Party Owners filed a complaint against TEP in the Supreme Court of the State of New York, New York County (New York Action). In response to motions filed by TEP to dismiss various counts and compel arbitration of certain of the matters alleged, and the court’s subsequent ruling on the motions, the Third-Party Owners have amended the complaint three times, dropping certain of the allegations and raising others in the New York Action and in the arbitration proceeding described below. As amended, the New York Action alleges, among other things, that TEP failed to properly operate, maintain, and make capital investments in Springerville Unit 1 during the term of the leases and that TEP has breached

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the lease transaction documents by refusing to pay certain of the Third-Party Owners’ claimed expenses. The third amended complaint seeks $71 million in liquidated damages and direct and consequential damages in an amount to be determined at trial. The Third-Party Owners have also agreed to stay their claim that TEP has not agreed to wheel power and energy as required pending the outcome of the FERC Action. In November 2015, the Third-Party Owners filed a motion for summary judgment on their claim that TEP has failed to pay certain of the Third-Party Owners’ claimed expenses.
In December 2014 and January 2015, Wilmington Trust Company, as Owner Trustees and Lessors under the leases of the Third-Party Owners, sent a notice to TEP that alleged that TEP had defaulted under the Third-Party Owners’ leases. The notices demanded that TEP pay liquidated damages totaling approximately $71 million. In letters to the Owner Trustees, TEP denied the allegations in the notices.
In April 2015, TEP filed a demand for arbitration with the American Arbitration Association (AAA) seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expenses and capital expenditures for Springerville Unit 1. In June 2015, the Third-Party Owners filed a separate demand for arbitration with the AAA alleging, among other things, that TEP has failed to properly operate, maintain and make capital investments in Springerville Unit 1 since the leases have expired. The Third-Party Owners’ arbitration demand seeks declaratory judgments, damages in an amount to be determined by the arbitration panel and the Third-Party Owners’ fees and expenses. TEP and the Third-Party Owners have since agreed to consolidate their arbitration demands into one proceeding. In August 2015, the Third-Party Owners filed an amended arbitration demand adding claims that TEP has converted the Third-Party Owners’ water rights and certain emission reduction payments and that TEP is improperly dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. The arbitration hearing is scheduled for July 2016.
In November 2015, TEP filed a petition to confirm the interim arbitration order in the Supreme Court of the State of New York naming the Owner Trustee and Co-Trustee as respondents. The petition seeks an order from the court confirming the interim arbitration order under the Federal Arbitration Act. In December 2015, the Owner Trustees filed an answer to the petition and a cross-motion to vacate the interim arbitration order.
As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
TEP cannot predict the outcome of the claims relating to Springerville Unit 1, and, due to the general and non-specific scope and nature of the claims, TEP cannot determine estimates of the range of loss, if any, at this time. TEP intends to vigorously defend itself against the claims asserted by the Third-Party Owners and to vigorously pursue the claims it has asserted against the Owner Trustees and Co-Trustees.
TEP and the Third-Party Owners have agreed to stay these litigation matters relating to Springerville Unit 1 in furtherance of settlement negotiations. However, there is no assurance that a settlement will be reached or that the litigation will not continue.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Tucson Electric Power Company, Factors Affecting Results of Operations for additional information regarding Springerville Unit 1 1.and Note 6.
UES PROPERTIES
At December 31, 2013, UNS Electric’s transmission and distribution system consisted of approximately 60 circuit-miles of 138-kV transmission lines, 274 circuit-miles of 69-kV transmission lines, and 3,651 circuit-miles of underground and overhead distribution lines. UNS Electric also owns the 62 MW Valencia plant, the 90 MW BMGS, as well as 40 substations having a total installed capacity of 1,549,000 kilovolt amperes.
At December 31, 2013, UNS Gas’ transmission and distribution system consisted of approximately 31 miles of steel transmission mains, 4,238 miles of steel and plastic distribution piping, and 138,951 customer service lines.
The gas and electric distribution and transmission facilities owned by UNS Electric and UNS Gas are located:
on property owned by UNS Electric or UNS Gas;
under or over streets, alleys, highways, and other places in the public domain, as well as national forests and state lands, under franchises, easements, or other rights which are generally subject to termination; or
under or over private property as a result of easements obtained primarily from the record holder of title.

ITEM 3. – LEGAL PROCEEDINGS
Shareholder Lawsuits
Five putative shareholder class action lawsuits challenging the merger have been filed, four in the Superior Court of Pima County, Arizona: (i) Phillip Malenovshy v. UNS Energy Corporation, et al. (Case No. C20136942); (ii) Paul Parshall v. UNS Energy Corporation, et al. (Case No. C20136943); (iii) Hillary Kramer v. Paul J. Bonavia, et al. (Case No. C2014-0026); and (iv) Vandermeer Trust U/A DTD 03/11/1997 v. UNS Energy Corporation, et al. (Case No. C2014-0107); and one in federal court in the United States District Court for the District of Arizona: Milton Pfeiffer v. Paul J. Bonavia, et al. (Case No. 4:13-CV-02619-JGZ).

The lawsuits generally allege, among other things, that the directors of UNS Energy breached their fiduciary duties to shareholders of UNS Energy purportedly by agreeing to a transaction pursuant to an inadequate process and for failing to

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obtain the highest value for UNS Energy shareholders. The lawsuits allege that the Fortis entities also aided and abetted the directors of UNS Energy in the alleged breach of their fiduciary duties.

The lawsuits seek, in general, and among other things, (i) injunctive relief enjoining the transactions contemplated by the merger agreement, (ii) rescission or an award of rescissory damages in the event a merger is consummated, (iii) an award of plaintiffs’ costs including reasonable attorneys’ and experts’ fees, (iv) an accounting by the defendants to plaintiffs for all damages caused by the defendants, and (v) such further relief as the court deems just and proper.

These lawsuits are at a preliminary stage. UNS Energy, its directors and the other defendants believe that these lawsuits are without merit and intend to defend against them vigorously.
Right of Way Matters
TEP previously reported it was a defendant in a class action filed in February 2009 in the United States District Court in Albuquerque, New Mexico by members of the Navajo Nation. The plaintiffs alleged, among other things, that the rights of way for defendants’ transmission lines on Navajo lands were improperly granted and that the compensation paid for such rights of way was inadequate. The plaintiffs were requesting, among other things, that the transmission lines on these lands be removed. In March 2010, the court entered a final judgment dismissing the case. The plaintiffs filed a Notice of Appeal with the Bureau of Indian Affairs (BIA) in May 2010, appealing the BIA’s decision to grant the rights of way that were the subject of the now-dismissed complaint. In June 2010, the BIA found that the Notice of Appeal failed to meet the minimum filing requirements. In September 2010, the plaintiffs filed new Notices of Appeal concerning the same rights of way. In August 2013, the Interior Board of Indian Appeals dismissed the plaintiffs’ appeal for failure to meet procedural requirements. TEP cannot predict if the plaintiffs will again attempt to appeal the BIA’s decision to grant the rights of way.
In addition, see legal proceedings discussed in Note 7.

ITEM 4. MINE SAFETY DISCLOSURES
Not applicable.


K-2916


PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS, AND ISSUER PURCHASES OF COMMON EQUITY SECURITIES
Stock Trading
UNS Energy’s Common Stock is traded under the ticker symbol UNS and is listed on the New York Stock Exchange. On February 14, 2014, the closing price was $60.21 with 7,392 shareholders of record.Market Information
TEP’s common stock is wholly-owned by UNS Energy and is not listed for trading on any stock exchange.
Dividends
UNS Energy
UNS Energy’s Board of Directors expects to continue to authorize the payment of regular quarterly cash dividends on our Common Stock; however, such dividends are subject to the Board’s evaluation of our financial condition, earnings, cash flows, and dividend policy.
The merger agreement with Fortis allows UNS Energy's Board of Directors to authorize quarterly dividends of up to $0.48 per share until the merger is completed, including a pro rata dividend determined by the number of days from the last declared record date to the date the merger is completed. See Item. 1- Business, Overview of Consolidated Businesses, Agreement and Plan of Merger.
On February 24, 2014, UNS Energy declared a first quarter cash dividend of $0.48 per share of Common Stock. The first quarter dividend, totaling approximately $20 million, will be paid March 25, 2014 to shareholders of record at the close of business March 13, 2014. The table below summarizes UNS Energy’s dividends paid in 2011 through 2013.
 2013 2012 2011
Quarterly Dividend Per Common Share$0.435
 $0.43
 $0.42
Annual Dividend Per Common Share$1.74
 $1.72
 $1.68
Common Stock Dividends Paid$72 million
 $70 million
 $62 million
UNS Energy relies on dividends from its subsidiaries, primarily TEP, to declare and pay dividends to its shareholders.
TEP
TEP paid dividends to UNS Energy of $50 million in 2015 and $40 million in 20132014 and $30 million in 2012. TEP did not pay any dividends to UNS Energy in 2011.2013.
TEP can pay dividends if it maintains compliance with the TEPits 2015 Credit Agreement, the 2010 Reimbursement Agreement, and certainthe 2013 Covenants Agreement which all contain substantially the same financial covenants. At December 31, 2013,2015, TEP was in compliance with the terms of all financial covenants and agreements.
The ACC's approval of the TEP Credit Agreement.
acquisition of UNS Electric
UNS Electric paid dividendsEnergy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than 60 percent of $10 millionTEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in 2013accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and 2012. UNS Electric did not pay any dividendsreported to UNS Energy in 2011. UNS Electric’s ability to pay future dividends will dependthe ACC annually beginning on the cash needs for capital expenditures and various other factors.
The note purchase agreement for UNS Electric contains restrictions on dividends. UNS Electric may pay dividends so long as (a) no default or eventApril 1, 2016. As of default exists and (b) it could incur additional debt under the debt incurrence test. At December 31, 2013, UNS Electric was in compliance with2015, TEP's dividend payments were still restricted as the terms50 percent of its note purchase agreement.total capital threshold had not yet been reached.
UNS Gas
UNS Gas paid dividends to UNS Energy of $10 million in 2013, $20 million in 2012, and $10 million in 2011. UNS Gas’ ability to pay future dividends will depend on the cash needs for capital expenditures and various other factors.
The note purchase agreement for UNS Gas contains restrictions on dividends. UNS Gas may pay dividends so long as (a) no default or event of default exists and (b) it could incur additional debt under the debt incurrence test. At December 31, 2013, UNS Gas was in compliance with the terms of its note purchase agreement.

K-30


Other Non-Reportable Segments
Millennium paid dividends to UNS Energy of $1 million in 2013, $14 million in 2012 and $3 million in 2011.
UED did not pay any dividends to UNS Energy in 2013 or 2012. UED paid dividends to UNS Energy of $39 million in 2011, of which $28 million represented a return of capital.
See Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations, UNS Energy Consolidated, Liquidity and Capital Resources, Dividends on Common Stock.
Common Stock Dividends and Price RangesITEM 6. SELECTED FINANCIAL DATA
  2013 2012
  Market Price per   Market Price per  
  Share of Common Dividends Share of Common Dividends
  
Stock (1)
 Declared 
Stock (1)
 Declared
Quarter: High Low   High Low  
First $49.13
 $43.10
 $0.435
 $38.66
 $35.83
 $0.43
Second 51.54
 42.51
 0.435
 38.86
 35.20
 0.43
Third 51.86
 43.81
 0.435
 42.71
 38.43
 0.43
Fourth 60.02
 45.30
 0.435
 43.56
 39.02
 0.43
Total     $1.74
     $1.72
(in thousands)2015 2014 2013 2012 2011
Income Statement Data         
Operating Revenues$1,306,544
 $1,269,901
 $1,196,690
 $1,161,660
 $1,156,386
Net Income127,794
 102,338
 101,342
 65,470
 85,334
Balance Sheet Data         
Total Utility Plant, Net$3,558,229
 $3,425,190
 $2,944,455
 $2,750,421
 $2,650,652
Total Assets (1)
4,249,478
 4,119,830
 3,490,085
 3,413,638
 3,247,647
          
Long-Term Debt, Net (1)
$1,451,720
 $1,361,828
 $1,213,367
 $1,213,246
 $1,072,037
Non-Current Capital Lease Obligations55,324
 69,438
 131,370
 262,138
 352,720
Cash Flow Data         
Net Cash Flows From Operating Activities$364,934
 $313,663
 $346,191
 $267,919
 $268,294
Net Cash Flows From Investing Activities(502,891) (517,638) (259,662) (227,881) (312,011)
Net Cash Flows From Financing Activities119,471
 252,810
 (140,937) 11,987
 51,452
Other Data         
Ratio of Earnings to Fixed Charges (2)
3.74
 2.56
 2.67
 2.10
 2.40
(1) 
UNS Energy’s Common Stock priceTotal Assets and Long-term Debt, Net were adjusted to reflect the reclassifications made as reported bya result of the New York Stock Exchange.recently adopted accounting pronouncements. See Note 1 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding recently adopted accounting pronouncements.
Convertible Senior Notes
See Note 6.
Issuer Purchases of Common Equity
UNS Energy did not purchase any shares of Common Stock during 2013, 2012, or 2011.


K-31


ITEM 6. – SELECTED FINANCIAL DATA
UNS Energy
 2013 2012 2011 2010 2009
 In Thousands
(Except per Share Data)
Income Statement Data         
Operating Revenues$1,484,560
 $1,461,766
 $1,478,702
 $1,425,947
 $1,396,606
Net Income127,478
 90,919
 109,975
 112,984
 105,901
Basic Earnings Per Share3.06
 2.25
 2.98
 3.10
 2.95
Diluted Earnings Per Share3.04
 2.20
 2.75
 2.86
 2.73
Shares of Common Stock Outstanding:         
Weighted Average41,618
 40,362
 36,962
 36,415
 35,858
End of Year41,538
 41,344
 36,918
 36,542
 35,851
          
Cash Dividends Declared per Share$1.74
 $1.72
 $1.68
 $1.56
 $1.16
          
Balance Sheet Data         
Total Utility Plant – Net$3,534,837
 $3,300,363
 $3,182,263
 $2,961,498
 $2,785,714
Total Investments in Lease Debt and Equity36,194
 45,457
 65,829
 103,844
 132,168
Other Investments and Other Property34,971
 36,537
 34,205
 61,676
 60,239
Total Assets4,273,069
 4,140,429
 3,989,279
 3,796,246
 3,615,211
          
Long-Term Debt$1,507,070
 $1,498,442
 $1,517,373
 $1,352,977
 $1,307,795
Non-Current Capital Lease Obligations149,767
 262,138
 352,720
 429,074
 488,349
Common Stock Equity1,130,784
 1,065,465
 888,474
 830,756
 759,329
Total Capitalization2,787,621
 2,826,045
 2,758,567
 2,612,807
 2,555,473
          
Cash Flow Data         
Net Cash Flows From Operating Activities$420,512
 $348,109
 $337,320
 $346,920
 $347,310
Capital Expenditures(325,886) (307,277) (374,122) (330,629) (294,020)
Net Cash Flows From Financing Activities(135,742) (37,682) (1,441) (51,183) (28,916)
          
Ratio of Earnings to Fixed Charges (1)
2.77
 2.30
 2.43
 2.62
 2.46


K-32


TEP
 2013 2012 2011 2010 2009
 Thousands of Dollars
Income Statement Data         
Operating Revenues$1,196,690
 $1,161,660
 $1,156,386
 $1,125,267
 $1,099,338
Net Income101,342
 65,470
 85,334
 108,260
 90,688
          
Balance Sheet Data         
Total Utility Plant – Net$2,944,455
 $2,750,421
 $2,650,652
 $2,410,077
 $2,261,325
Total Investments in Lease Debt and Equity36,194
 45,457
 65,829
 103,844
 132,168
Other Investments and Other Property33,488
 35,091
 32,313
 43,588
 31,813
Total Assets3,556,060
 3,461,046
 3,277,661
 3,078,411
 2,924,108
          
Long-Term Debt1,223,070
 1,223,442
 1,080,373
 1,003,615
 903,615
Non-Current Capital Lease Obligations149,767
 262,138
 352,720
 429,074
 488,311
Common Stock Equity925,923
 860,927
 824,943
 709,884
 650,591
Total Capitalization2,298,760
 2,346,507
 2,258,036
 2,142,573
 2,042,517
          
Cash Flow Data         
Net Cash Flows From Operating Activities$346,191
 $267,919
 $268,294
 $302,483
 $268,064
Capital Expenditures(252,848) (252,782) (351,890) (277,309) (240,079)
Net Cash Flows From Financing Activities(140,937) 11,987
 51,452
 (51,882) (29,320)
          
Ratio of Earnings to Fixed Charges (1)
2.67
 2.10
 2.40
 2.74
 2.56
(1)(2) 
For purposes of this computation, earnings are defined as pre-tax earnings from continuing operations before minority interest, or income/loss from equity method investments, plus interest expense and amortization of debt discount and expense related to indebtedness. Fixed charges are interest expense, including amortization of debt discount, interest on operating lease payments, and expense on indebtedness.indebtedness, including capital lease obligations.
See Part II, Item 7. – Management’sManagement's Discussion and Analysis of Financial Condition and Results of Operationsfor additional information.


K-3317



ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Management’s Discussion and Analysis explains the results of operations, the general financial condition, and the outlook for UNS Energy and its three primary business segments.TEP. It includes the following:
outlook and strategies;
operating results during 20132015 compared with 2012,the same periods of 2014, and 20122014 compared with 2011;
2013;
factors affecting our results and outlook;
liquidity, capital needs, capital resources, and contractual obligations;
dividends; and
critical accounting estimates.
Management’s Discussion and Analysis includes financial information prepared in accordance with Generally Accepted Accounting Principles in the United States of America (GAAP), as well as certain non-GAAP financial measures. The non-GAAP financial measures should be viewed as a supplement to, and not a substitute for, financial measures presented in accordance with GAAP. Non-GAAP financial measures as presented herein may not be comparable to similarly titled measures used by other companies.
Management’s Discussion and Analysis should be read in conjunction with Item 6 of this Form 10-K and the Consolidated Financial Statements and Notes in Item 8 of this Form 10-K. For information on factors that may cause our actual future results to differ from those we currently seek or anticipate, see Forward-Looking Information at the front of this report and Part I, Item 1A. Risk Factors for additional information.
References in this report to "we" and "our" are to TEP.

UNS ENERGY CORPORATION
UNS Energy is a utility services holding company engaged, through its primary subsidiaries, in the electric generation and energy delivery business. Each of UNS Energy’s subsidiaries is a separate legal entity with its own assets and liabilities. UNS Energy owns 100% of TEP and UES.
References to “we” and “our” are to UNS Energy and its subsidiaries, collectively.
OUTLOOK AND STRATEGIES
Agreement and Plan of Merger
In December 2013, UNS Energy entered into an Agreement and Plan of Merger with Fortis Parent, Fortis and Merger Sub. The Boards of Directors of each of UNS Energy and Fortis Parent have approved the Merger. At the completion of the Merger, each outstanding share of UNS Energy common stock will be converted into the right to receive $60.25 in cash and UNS Energy will become a wholly-owned subsidiary of Fortis.
The Merger is subject to the approval of stockholders holding a majority of the outstanding shares of UNS Energy and other customary closing conditions, including, among other things:
the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended;
approvals of the Arizona Corporation Commission and the Federal Energy Regulatory Commission;
confirmation of review, without unresolved concerns, from the Committee on Foreign Investment in the United States; and
the absence of any injunction, order or other law prohibiting the Merger.
On February 18, 2014, we filed definitive proxy materials with the SEC. We expect UNS Energy's shareholders to formally consider a proposal to approve the Merger Agreement at a meeting on March 26, 2014.
In January 2014, UNS Energy and Fortis Parent filed an application and supporting testimony with the ACC requesting approval of the Merger. The ACC administrative law judge (ALJ) assigned to this matter issued a procedural order that calls for settlement discussions to commence on April 28, 2014, and a hearing before the ALJ to commence on June 16, 2014. In February 2014, we filed an application with FERC requesting approval of the Merger. The Merger is expected to close by the end of 2014. If the Merger is completed, UNS Energy expects to record approximately $22 million of expenses related to the Merger in 2014.
Operating Plans and Strategies
OurTEP's financial prospects and outlook are affected by many factors including: global, national, regional, and local economic conditions; volatility in the financial markets; environmental laws and regulations; and other regulatory factors. Our plans and strategies include the following:
Completing the proposed Merger with Fortis including obtaining all necessary approvals;

K-34


Completing the purchasesits full cost of Gila River Unit 3service and additional interests in Springerville Unit 1, which are both key componentsan opportunity to earn an appropriate return on its rate base investments, updated rates to provide more accurate price signals and a more equitable allocation of costs to TEP's customers, and enables TEP to continue to provide safe and reliable service.
Continuing to focus on our long-term diversification strategy for our generating portfolio. The focus of ourgeneration resource strategy, isincluding shifting from coal to provide long-termnatural gas, renewables, and energy efficiency while providing rate stability for our customers, mitigatemitigating environmental impacts, complycomplying with regulatory requirements, and leverageleveraging our existing utility infrastructure.
Strengthening the underlyinginfrastructure, and maintaining financial condition of our utility subsidiaries by achieving constructive regulatory outcomes, improving our capital structure and our credit ratings, and promoting economic development in our service territories.strength.
Developing strategic responses to new environmental regulations and potential new legislation, including potential limits onnew carbon emission standards to reduce greenhouse gas emissions.emissions from existing power plants. We are evaluating TEP's existing mix of generation resources and defining steps to achieve environmental objectives that protect the financial stability of our utility businesses.business and the interests of our customers.
Strengthening the underlying financial condition of TEP by achieving constructive regulatory outcomes, strengthening our capital structure, sustaining our credit ratings, and promoting economic development in our service territory.
Focusing on our core utility businessesbusiness through operational excellence, investing in utility rate base, emphasizing customer service, and maintaining a strong community presence.

Expanding TEP's
18




2015 Operational and Financial Highlights
The year ended December 31, 2015 included the following notable items:
In January 2015, TEP purchased an additional 24.8% undivided ownership interest in Springerville Unit 1, bringing its total ownership interest to 49.5%;
In January 2015, TEP purchased existing unsecured tax-exempt industrial development revenue bonds in the amount of $130 million using funds borrowed from the term loan portion of the 2014 Credit Agreement;
In February 2015, TEP issued and sold $300 million of unsecured notes;
In April 2015, TEP purchased an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities, and in May 2015, TEP sold a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
In June 2015, TEP terminated the 2014 Credit Agreement;
In June 2015, TEP received an equity contribution of $180 million from UNS Electric's portfolioEnergy;
In October 2015, TEP entered into a new unsecured credit agreement (2015 Credit Agreement) that provides for a $250 million revolving credit and letter of renewable energy resourcescredit (LOC) facility. The new credit agreement matures in 2020 and programsreplaces the 2010 Credit Agreement;
In November 2015, TEP filed a general rate case with the ACC that requests, among other things, a Base Rate increase of $110 million. The application also requests that new rates become effective no later than January 1, 2017; and
In December 2015, TEP completed construction and placed into service a 500-kV transmission line extending from the Pinal Central substation to meet Arizona's Renewable Energy Standard (RES) while creating ownership opportunities for renewable energy projects that benefit customers, shareholders, and the communities we serve.
Developing strategic responses to Arizona's Energy Efficiency Standards that protect the financial stabilityTEP’s Tortolita substation northwest of our utility businesses and provide benefits to our customers.Tucson.

RESULTS OF OPERATIONS
ContributionThe following discussion provides the significant items that affected TEP's results of operations for the years ended December 31, 2015, 2014 and 2013. The significant items affecting net income are presented on an after-tax basis.
2015 compared with 2014
TEP reported net income of $128 million in 2015 compared with $102 million in 2014. The increase of $26 million, or 25%, was primarily due to:
$16 million in lower O&M resulting primarily from acquisition related costs and outages at Springerville Units 1 and 2 that were incurred in 2014, partially offset by Business Segmenthigher O&M related to Gila River, labor costs, and outside services;
$6 million in higher transmission revenue resulting primarily from an increase in sales volume on favorably priced contracts; and
$4 million in lower interest expense primarily due to a reduction in the balance of capital lease obligations.
2014 compared with 2013
TEP reported net income of $102 million in 2014 compared with $101 million in 2013. The increase of $1 million, or 1%, was primarily due to:
$25 million in higher revenues including a non-fuel Base Rate increase that was effective on July 1, 2013, an increase in LFCR revenues, higher long-term wholesale revenues due in part to an increase in the average market price and higher transmission revenue; and
$7 million in lower interest expense, primarily due to a reduction in the balance of capital lease obligations.
The increase was partially offset by:
$22 million in higher O&M for acquisition related costs, higher generating plant maintenance expense, and increased rent expense associated with the Navajo lease amendment;

19



$5 million in higher income taxes primarily generated by a non-recurring $11 million tax benefit recorded in June 2013 to recover previously recorded income tax expense as a result of the 2013 TEP Rate Order. This amount is partially offset by a $2 million increase in the valuation allowance in 2013 and a $3 million increase in investment tax credits recorded in 2014. See Note 12 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding income taxes; and
$4 million in higher depreciation and amortization expenses, resulting primarily from an increase in asset base in the current year.

20



Utility Sales and Revenues
The table below shows the contributions to our consolidated net income by business segment:
provides a summary of retail kWh sales, revenues, and weather data during 2015, 2014 and 2013:
 2013 2012 2011
 Millions of Dollars
TEP$101
 $65
 $85
UNS Electric12
 17
 18
UNS Gas11
 9
 10
Other Non-Reportable Segments and Adjustments (1)
3
 
 (3)
Consolidated Net Income$127
 $91
 $110
 Year Ended Increase (Decrease) Year Ended Increase (Decrease)
 2015 2014 
Percent(1)
 2013 
Percent(1)
Electric Retail Sales (kWh in millions)         
Residential3,724
 3,727
 (0.1)% 3,867
 (3.6)%
Commercial2,124
 2,170
 (2.1)% 2,187
 (0.8)%
Industrial2,063
 2,098
 (1.7)% 2,114
 (0.8)%
Mining1,109
 1,137
 (2.5)% 1,079
 5.4 %
Public Authorities33
 33
  % 32
 3.1 %
Total Electric Retail Sales9,053
 9,165
 (1.2)% 9,279
 (1.2)%
Retail Margin Revenues (in millions)         
Residential$281
 $280
 0.4 % $271
 3.3 %
Commercial185
 188
 (1.6)% 181
 3.9 %
Industrial103
 104
 (1.0)% 97
 7.2 %
Mining38
 38
  % 34
 11.8 %
Public Authorities2
 2
  % 2
  %
Total by Customer Class609
 612
 (0.5)% 585
 4.6 %
LFCR Revenues12
 11
 9.1 % 2
 *
DSM Performance Bonus3
 2
 50.0 % 1
 100.0 %
Other Retail Margin Revenues5
 1
 *
 
 *
Total Retail Margin Revenues (Non-GAAP) (1)
629
 626
 0.5 % 588
 6.5 %
Fuel and Purchased Power Revenues344
 303
 13.5 % 300
 1.0 %
DSM and RES Surcharge Revenues49
 41
 19.5 % 46
 (10.9)%
Total Retail Revenues (GAAP)$1,022
 $970
 5.4 % $934
 3.9 %
Average Retail Margin Rate (Cents / kWh) (2)
         
Residential7.55
 7.51
 0.5 % 7.02
 7.0 %
Commercial8.71
 8.66
 0.6 % 8.28
 4.6 %
Industrial4.99
 4.96
 0.6 % 4.61
 7.6 %
Mining3.43
 3.34
 2.7 % 3.14
 6.4 %
Public Authorities5.61
 6.06
 (7.4)% 5.56
 9.0 %
Total Average Margin Rate by Customer Class6.73
 6.68
 0.7 % 6.30
 6.0 %
Total Average Retail Margin Rate (3)
6.95
 6.80
 2.2 % 6.31
 7.8 %
Average Fuel and Purchased Power Rate3.80
 3.31
 14.8 % 3.24
 2.2 %
Average DSM and RES Rate0.54
 0.48
 12.5 % 0.52
 (7.7)%
Total Average Retail Rate11.29
 10.59
 6.6 % 10.07
 5.2 %
Weather Data
 
 
 
 
Cooling Degree Days         
Year Ended December 31,1,576
 1,557
 1.2 % 1,631
 (4.5)%
10-Year Average1,520
 1,515
 *
 1,491
 *
Heating Degree Days         
Year Ended December 31,1,072
 930
 15.3 % 1,449
 (35.8)%
10-Year Average1,317
 1,335
 *
 1,404
 *
* Not meaningful
(1) 
Includes: UNS Energy parent company expenses; Millennium; UED;Retail Margin Revenues, a non-GAAP financial measure, should not be considered as an alternative to Total Retail Revenues, which is determined in accordance with GAAP. Retail Margin Revenues exclude: (i) revenues collected from retail customers that are

21



directly offset by expenses recorded in other line items; and (ii) revenues collected from third parties that are unrelated to kWh sales to retail customers. We believe the change in Retail Margin Revenues between periods provides useful information because it demonstrates the underlying revenue trend and performance of our core utility business. Retail Margin Revenues represents the portion of retail operating revenues from kWh sales, LFCR Revenues, DSM Performance Bonus, and certain other retail margin revenues available to cover the non-fuel operating expenses of our core utility business.
(2)
Calculated on un-rounded data and inter-company eliminations.may not correspond exactly to data shown in table.
(3)
Total Average Retail Margins Rates include revenues related to LFCR Revenues, DSM Performance Bonus, and Other Retail Margin Revenues included in the Total Retail Margin Revenues.
Executive Overview
2013 Compared with 2012
TEP
TEP reported net income of $101 millionRetail Revenues were higher in 20132015 compared with net income of $65 million2014 primarily due to the increase in 2012.the PPFAC rate and higher Retail Margin Revenues. Retail Margin Revenues were higher primarily due to higher LFCR revenues, DSM Performance Bonus, and Other Retail Margin Revenues related to adjustor mechanisms.
Retail Revenues were higher in 2014 compared with 2013 primarily due to higher Retail Margin Revenues and increased LFCR revenues. The increase in net income isRetail Margin Revenues resulted from a non-fuel Base Rate increase effective July 1, 2013. These increases were partially offset by lower sales volume due to milder weather.
Wholesale Sales and Transmission Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Long-Term Wholesale Revenues$36

$28
 $26
Transmission Revenues27
 16
 15
Short-Term Wholesale Revenues104
 114
 92
Total Electric Wholesale Sales$167
 $158
 $133
Long-Term Wholesale Revenues increased by $8 million, or 29%, in part to:2015 compared with 2014 primarily due to new wholesale agreements partially offset by unfavorable wholesale market prices. Transmission Revenues increased by $11 million, or 69%, in 2015 compared with 2014 primarily due to a $41 million increase in retail margin revenuesnew long-term transmission agreement with UNS Electric related to a non-fuel base rate increase that was effective on July 1, 2013Gila River and higher retail kWh salescontract renewals resulting fromin favorable weather conditions; apricing.
Long-Term Wholesale Revenues increased by $2 million, increaseor 8%, in the margin on long-term wholesale sales2014 compared with 2013 primarily due to higherfavorable market prices for wholesale power;power. There were no significant changes in transmission revenues in 2014 compared to 2013.
The majority of revenues from short-term wholesale sales are related to ACC jurisdictional assets and a $9 million decreaseare credited against the fuel and purchased power costs eligible for recovery in interest expense duethe PPFAC.
Other Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Springerville Units 3 and 4 Revenue (1)
$91
 $112
 $102
Other Revenue27
 29
 28
Total Other Revenue$118
 $141
 $130
(1)
Represents revenues and reimbursements from Tri-State, the lessee of Springerville Unit 3, and SRP, the owner of Springerville Unit 4, to TEP related to the operation of these plants.
In addition to reimbursements related to Springerville Units 3 and 4, TEP’s other revenues include inter-company revenues from its affiliates, UNS Gas, Inc., an indirect wholly-owned subsidiary of UNS Energy, (UNS Gas) and UNS Electric, for corporate services provided by TEP, and miscellaneous service-related revenues such as rent on power pole attachments, damage claims, and customer late fees. See Note 5 of Notes to Consolidated Financial Statements in part to a reductionItem 8 of this Form 10-K for additional information regarding related party transactions.
There were no significant changes in capital lease obligation balances; partially offset by a $12 million increaseOther Revenue in Base O&M due in part to planned and unplanned maintenance on TEP's generating facilities,2015 compared with 2014, as well as merger-related expenses of $6no significant changes in Other Revenue in 2014 compared with 2013.

22



Operating Expenses
Generating Output and Fuel and Purchased Power Expense
TEP’s fuel and purchased power expense and energy resources for 2015, 2014, and 2013 are detailed below:
 Generation and Purchased Power (kWh) Fuel and Purchased Power Expense
(in millions)2015 2014 2013 2015 2014 2013
Coal-Fired Generation8,584
 9,271
 10,254
 $209
 $232
 $273
Gas-Fired Generation2,723
 1,210
 1,007
 91
 60
 46
Utility Owned Renewable Generation65
 48
 38
 
 
 
Reimbursed Fuel Expense for Springerville Units 3 and 4 (1)

 
 
 5
 5
 7
Total Generation11,372
 10,529
 11,299
 305
 297
 326
Total Purchased Power3,079
 3,195
 2,329
 125
 153
 112
Transmission and Other PPFAC Recoverable Costs
 
 
 25
 18
 12
Increase (Decrease) to Reflect PPFAC Recovery Treatment
 
 
 40
 (11) (12)
Total Generation and Purchased Power14,451
 13,724
 13,628
 $495
 $457
 $438
Less Line Losses and Company Use(719) (859) (885)      
Total Energy Sold13,732
 12,865
 12,743
      
(1)
Springerville Unit 3 and 4 Fuel Expense is reimbursed by Tri-State and SRP.
Fuel and Purchased Power Expense increased by $38 million, recordedor 8%, in December 2013; and a $3 million increase in taxes other than income taxes2015 compared with 2014 primarily due in part to an increase in property tax ratesthe PPFAC charge and higher asset balances.
Additionally, TEP's net income in 2013 includes an income tax benefit of $11 million. In June 2013, we recorded a regulatory assetadditional generation and corresponding reduction of income tax expense of $11 million to recover previously recorded income tax expense through future ratestransmission costs associated with Gila River Unit 3. The increase was partially offset by favorable purchased power costs (see table below) and decreased coal generation at Springerville Unit 1 as a result of the lease expiration in January 2015.
Fuel and Purchased Power Expense increased by $19 million, or 4%, in 2014 compared with 2013 TEP Rate Order. The regulatory asset will be amortized as income tax expense as the qualifying assets are depreciated. See Note 9. TEP's 2013 results also include additional fuel expense of $3 million related to a one-time credit to customers resulting from the 2013 TEP Rate Order. TEP's results in 2012 reflect a $3 million reduction

K-35


to pre-tax incomeprimarily due to an unplanned outage at Springerville Unit 3 and a $5 million write-off of transmission related assets. See Tucson Electric Power Company, Results of Operations.
UNS Electric
UNS Electric reported net income of $12 million in 2013 compared with net income of $17 million in 2012. The decrease in net income was due in part to lower mining kWh sales during 2013 and the loss of an industrial customer in the second half of 2012. See UNS Electric, Results of Operations.
UNS Gas
UNS Gas reported net income of $11 million in 2013 compared with net income of $9 million in 2012. The increase in net income is due primarily to: higher salespurchased power volumes resulting from cold weather, which contributed to an improvementoutages at Springerville and Sundt generating stations in retail margin revenues; and a non-fuel base rate2014. The increase that was effective in May 2012. See UNS Gas, Results of Operations.
2012 Compared with 2011
TEP
TEP reported net income of $65 million in 2012 compared with $85 million in 2011. The decrease in net income was due primarily to: a $7 million decline in retail margin revenues resulting from lower retail kWh sales due to milder summer weather than 2011, as well as the effects of the ACC’s energy efficiency and distributed generation requirements; an $8 million decline in long-term wholesale margin revenues resulting primarily from a change in the pricing of energy sold under the SRP wholesale contract that was effective on June 1, 2011; an $11 million increase in depreciation and amortization expense as a result of an increase in utility plant-in-service; and a $5 million decrease in pre-tax income related to the partial write-off of transmission-related assets. These factors were partially offset by a decrease in TEP’s Base O&M, resulting primarily from fewer planned generating plantgeneration expense as a result of the outages. Net income in 2011 included the recognition of a $7 million pre-tax gain related to the settlement of a dispute with El Paso Electric. See Tucson Electric Power, Results of Operations.
UNS Electric and UNS Gas
UNS Electric reported net incomeSee the table below for information on the average fuel cost of $17 million in 2012 compared with net income of $18 million in 2011. See generated and purchased kWh:UNS Electric, Results of Operations.
UNS Gas reported net income of $9 million in 2012 compared with net income of $10 million in 2011. See UNS Gas, Results of Operations.
(cents per kWh)2015 2014 2013
Coal2.44
 2.50
 2.66
Gas3.35
 4.99
 4.57
Purchased Power4.05
 4.79
 4.83
All Sources3.31
 3.64
 3.54
Operations and Maintenance Expense
The table below summarizes the items included in UNS Energy’s Operations and Maintenance (O&M) expense. In 2013, Base O&M includes merger-related expenses of $7 million.expense:
 2013 2012 2011
 Millions of Dollars
UNS Energy Base O&M (Non-GAAP)(1) 
$288
 $266
 $271
Reimbursed Expenses Related to Springerville Units 3 and 470
 72
 63
Expenses Related to Customer-Funded Renewable Energy and Demand Side Management (DSM) Programs(2)
32
 46
 45
Total UNS Energy O&M (GAAP)390
 $384
 $379
(in millions)2015 2014 2013
Reimbursed Expenses - Springerville Units 3 and 4 (1)
$65
 $84
 $70
Reimbursed Expenses - Customer Funded Renewable Energy and
DSM Programs (2)
25
 23
 26
Other Operating and Maintenance Expense (3)
255
 272
 239
Total Operations and Maintenance Expense$345
 $379
 $335
(1) 
Base O&M, a non-GAAP financial measure, should not be considered as an alternative to O&M, which is determined in accordance with generally accepted accounting principles (GAAP). We believe Base O&M provides useful information to investors because it represents the fundamental level of operating and maintenance expenseExpenses related to our core business. Base O&M excludes expenses thatSpringerville Units 3 and 4 are directly offset by revenues collected from customers andreimbursed with corresponding amounts recorded in other third parties.revenue.
(2) 
Represents expenses related to customer-funded renewable energy and DSM programs; theseThese expenses are being collected from customers and the corresponding amounts are recorded in retail revenue.
(3)
The Third-Party Owners' share of expenses related to Springerville Unit 1 is included in Other Operating and Maintenance Expense.

23



Operating and Maintenance expenses decreased by $34 million, or 9%, in2015 compared with 2014. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, decreased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense decreased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014, partially offset by higher O&M related to Gila River, labor costs and outside services.
Operating and Maintenance expenses increased by$44 million, or 13%, in 2014 compared with 2013. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, increased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense increased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014.

FACTORS AFFECTING RESULTS OF OPERATIONS
2015 Rate Case
In November 2015, TEP filed a general rate case with the ACC to: (i) update and improve its rate design and tariffs to provide more accurate price signals and a more equitable allocation of its fixed costs to its customers; (ii) provide TEP with an opportunity to recover its full cost of service, including an appropriate return on its rate base investments; and (iii) enable TEP to continue to provide safe and reliable service. The rate application is based on a test year ended June 30, 2015. The filing requests that new rates be implemented by January 1, 2017.
The key provisions of the rate case include:
a Base Rate increase of $110 million, or 12%, compared with adjusted test year revenues;
a 7.34% return on original cost rate base of $2.1 billion;
a capital structure for rate making purposes of approximately 50% common equity and 50% long-term debt;
a cost of equity of 10.35% and an average cost of debt of 4.32%;
a request to apply excess depreciation reserves against the unrecovered net book value (NBV) of San Juan Unit 2 and the Sundt Coal Handling Facilities due to early retirement;
a request for authority to begin using the Third-Party Owners' portion of Springerville Unit 1 that is available to TEP for dispatch to serve retail customer needs and to recover the related operating costs through the PPFAC; and
rate design changes that would reduce the reliance on volumetric sales to recover fixed costs, and a new net metering tariff that would ensure that customers who install distributed generation pay an equitable price for their electric service.
TEP cannot predict the outcome of this proceeding or whether its rate request will be adopted by the ACC in whole or in part.
Generating Resources
At December 31, 2015, approximately 49% of TEP's generating capacity was fueled by coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating additional steps to reduce its dependency on coal generation.
In August 2015, TEP exhausted its existing coal supply at Unit 4 of the H. Wilson Sundt Generating Station (Sundt Unit 4). Currently, TEP is operating Sundt Unit 4 on natural gas as a primary fuel source.
TEP's ability to further reduce its coal-fired generating capacity will depend on several factors, including, but not limited to:
The impact of the Clean Power Plan on current coal-fired generating facilities; and
The ability to resolve Springerville Unit 1 legal proceedings relating to the Third-Party Owners.
See Part I, Item 1. Business, General for additional information regarding TEP's generating facilities.

K-3624


Springerville Unit 1
TEP leased Unit 1 of the Springerville Generating Station and an undivided one-half interest in certain Springerville Common Facilities (collectively Springerville Unit 1) under seven separate lease agreements (Springerville Unit 1 Leases) that were accounted for as capital leases. The leases expired in January 2015. At that time, TEP purchased a leased interest comprising 24.8% of Springerville Unit 1, representing 96 MW of capacity, for an aggregate purchase price of $46 million. Following this purchase, TEP owns 49.5% of Springerville Unit 1, or 192 MW of capacity.
The remaining 50.5% of Springerville Unit 1, or 195 MW of capacity, is owned by Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the Third-Party Owners’ generating output. TEP is obligated to operate the unit for the Third-Party Owners. Owner Trustees and Co-Trustees are obligated to compensate TEP for their pro rata share of expenses for the unit. TEP estimates the Third-Party Owners’ share of 2016 operations and maintenance expense will be $27 million and their estimated share of 2016 capital expenditures will be $9 million.
In April 2015, TEP filed a demand for arbitration seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expense and capital expenditures for Springerville Unit 1. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part I, Item 3. Legal Proceedings for additional information regarding the legal proceedings relating to the Third-Party Owners.
Potential Plant Retirements
TEP's 2014 Integrated Resource Plan (IRP), which was acknowledged by the ACC in April 2015, reflected plans to reduce its overall coal capacity by 492 MW (32% of TEP's existing coal fleet) by 2018. TEP's 2014 IRP included retiring certain coal-fired generating facilities at San Juan Generating Station (San Juan) and coal handling facilities at the H. Wilson Sundt Generating Station (Sundt) earlier than their current estimated useful lives. These facilities currently do not have the requisite emission control equipment to meet proposed Environmental Protection Agency (EPA) regulations. TEP plans to seek regulatory recovery for amounts that would not otherwise be recovered if and when any assets are retired. TEP plans to file a preliminary IRP in March 2016 and is required to file its next IRP by April 2017.
See Part I, Item 1. Business, Environmental Matters for additional information regarding the impact of environmental matters on plant operations.
Springerville Coal Handling Facilities Capital Lease Purchase
TEP previously leased interests in the coal handling facilities at the Springerville Generating Station (Springerville Coal Handling Facilities) under two separate lease agreements (Springerville Coal Handling Facilities Leases). The lease agreements had an initial term that expired in April 2015 and provided TEP the option to renew the leases or to purchase the leased interests at the aggregate fixed price of $120 million. In April 2015, TEP exercised its option to purchase the facilities.
Upon the expiration of the lease term, TEP purchased an 86.7% undivided ownership interest in the Springerville Coal Handling Facilities bringing TEP's total ownership interest to 100%. With the completion of the purchase, SRP was obligated to buy a 17.05% undivided interest in the Springerville Coal Handling Facilities from TEP for approximately $24 million. This transaction was completed in May 2015. Tri-State, is obligated to either: 1) buy a 17.05% undivided interest in the facilities for approximately $24 million or 2) continue to make payments to TEP for the use of the facilities. Tri-State has until April 2016 to exercise its purchase option.
Sales to Mining Customers
TEP's largest mining customer is taking initial steps to curtail production in 2016 due to the decline in commodity prices. TEP cannot predict the extent to which this customer will curtail production, how long commodity prices will remain low, or the

25



total impact the prices will have on mining production in the future. At December 31, 2015, mining customers made up 8% of TEP's total electric sales.
The proposed Rosemont Copper Mine near Tucson, Arizona is in the permitting stage. If the Rosemont Copper Mine is constructed and reaches full production, it will become TEP's largest retail customer with an estimated load of approximately 85 to 120 MW.
Interest Rates
See Part II, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for information regarding interest rate risks and its impact on earnings.

LIQUIDITY AND CAPITAL RESOURCES
UNS Energy Consolidated Liquidity
Cash flows may vary during the year, with cash flowflows from operations typically the lowest in the first quarter and highest in the third quarter due to TEP’s summer peaking load. As a result of the varied seasonal cash flow, UNS Energywe will use, as needed, itsour revolving credit facility to assist in funding its business activities. The table below provides a summary of the liquidity position of UNS Energy and each of its segments:
Balances at December 31, 2013
Cash and  Cash
Equivalents
 
Borrowings under
Revolving Credit
Facility(1)
 
Amount Available
under Revolving
Credit Facility
 Millions of Dollars
UNS Energy Stand-Alone$9
 $54
 $71
TEP25
 1
 199
UNS Electric(2)
5
 22
 48
UNS Gas(2)
33
 
 70
Other(3)
3
 N/A
 N/A
Total$75
    
(1)
Includes Letters of Credit (LOCs) issued under revolving credit facilities.
(2)
Either UNS Gas or UNS Electric may borrow up to a maximum of $70 million; the total combined amount borrowed by both companies cannot exceed $100 million.
(3)
Includes cash and cash equivalents at Millennium and UED.
In March 2014, TEP expects to issue a $15 million LOC to a subsidiary of Entegra to satisfy a condition of the Gila River Unit 3 purchase agreement. TEP's borrowing capacity under the TEP Credit Agreement will be reduced by $15 million until the Gila River transaction closes and the LOC is terminated.
Dividends from UNS Energy’s subsidiaries represent the parent company’s main source of liquidity.
Dividends from Subsidiaries
UNS Energy received $40 million in dividends from TEP and $10 million in dividends from each of UNS Electric and UNS Gas in 2013, and $1 million from Millennium. In 2012, UNS Energy received dividends of $30 million from TEP, $20 million from UNS Gas, $14 million from Millennium, and $10 million from UNS Electric.
Short-term Investments
UNS Energy’s short-term investment policy governs the investment of excess cash balances. We regularly review and update this policy in response to market conditions. At December 31, 2013, UNS Energy’s short-term investments included highly-rated and liquid money market funds and certificates of deposit.
Access to Revolving Credit Facilities
We have access to working capital through revolving credit agreements with lenders. Each of these agreements is a committed facility that expires in November 2016. The TEP Revolving Credit Facility and UNS Electric/UNS Gas Revolver may be used for revolving borrowings as well as to issue LOCs. TEP, UNS Electric, and UNS Gas each issue LOCs from time to time to provide credit enhancement to counterparties for their energy procurement and hedging activities. The UNS Credit Agreement also may be used to issue LOCs for general corporate purposes.
We believe that we have sufficient liquidity under our revolving credit facilities to meet short-term working capital needs and to provide credit enhancement as necessary under energy procurement and hedging agreements. However, TEP will need to issue long-term debt or enter into additional short-term credit facilities by June 2014
Available Liquidity
(in millions)As of December 31, 2015
Cash and Cash Equivalents$56
Amount Available under Revolving Credit Facility (1)
250
Total Liquidity$306
(1)
TEP's revolving credit facility, which matures in 2020, provides for a $250 million revolving credit commitment with a LOC sublimit of $50 million.
Future Liquidity Requirements
We expect to meet capital expenditure requirementsall of our financial obligations and scheduled mid-year capital lease payments. other anticipated cash outflows for the foreseeable future. These obligations and anticipated cash outflows include, but are not limited to, dividend payments, debt maturities, and obligations included in the Contractual Obligations and forecasted Capital Expenditures tablesbelow.
See Part III, Item 7A7A. Quantitative and Qualitative Disclosures about Market Risk.for additional information regarding TEP's market risks and Note 6of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's financing arrangements.
Summary of Cash Flow
The table below presents net cash provided by (used for) operating, investing and financing activities:
 Year Ended 
Increase
(Decrease)
 Year Ended 
Increase
(Decrease)
(in millions)2015 2014 Percent 2013 Percent
Operating Activities$365
 $314
 16.2 % $346
 (9.2)%
Investing Activities(503) (518) (2.9)% (260) 99.2 %
Financing Activities120
 253
 (52.6)% (141) 279.4 %
Net Increase (Decrease) in Cash(18) 49
 (136.7)% (55) 189.1 %
Cash, Beginning of Year74
 25
 196.0 % 80
 (68.8)%
Cash, End of Year$56
 $74
 (24.3)% $25
 196.0 %
Cash Flows for both 2015 and 2014 included unusually large capital expenditures. These capital requirements were met with a combination of equity contributions from UNS Energy and long-term borrowings as discussed in Financing Activities below.

K-3726


In 2015, we issued long-term debt and used the proceeds to repay revolving and term loans under our credit agreements and pay a portion of the purchase price for interests in the Springerville Coal Handling Facilities. In addition, we received an equity contribution from UNS Energy Consolidated Cash Flows
 Years Ended December 31,
 2013 2012 2011
 Millions of Dollars
Operating Activities$421
 $348
 $337
Investing Activities(334) (263) (327)
Financing Activities(136) (37) (2)
Net Increase (Decrease) in Cash(49) 48
 8
Beginning Cash124
 76
 68
Ending Cash$75
 $124
 76
UNS Energy’s operating cash flows are generated primarily by retail and wholesale energy sales at TEP, UNS Electric, and UNS Gas, net ofused the related payments for fuel and purchased power. Generally, cash from operations is lowest inproceeds to repay the first quarter and highest in the third quarter due to TEP’s summer-peaking load. TEP, UNS Electric, and UNS Gas typically use theiroutstanding balances under our revolving credit facilities to assistand redeem long-term variable rate tax-exempt bonds which were called for redemption in funding their business activities during periods when sales are seasonally lower.June 2015.
Capital expenditures at TEP, UNS Electric, and UNS Gas represent the primary use of cash for investing activities.
Cash used for investing and financing activities can fluctuate year-to-year depending on: capital expenditures; repayments and borrowings under revolving credit facilities; debt issuances or retirements; capital lease payments by TEP; and dividends paid byIn 2014, we received an equity contribution from UNS Energy and used the proceeds to its shareholders.pay for the purchase of both Gila River Unit 3 and Springerville Unit 1 leased assets.
Operating Activities
2015 compared with 2014
In 2013,2015, net cash flows from operating activities were $73 million higher than they were in 2012. The following items affected the year-over-year change in operating cash flows: a $23increased by $51 million increase incompared to 2014 primarily due to:
$39 million of higher cash receipts from retail and wholesale sales, net of fuel and purchased power costs paid due to a non-fuel base rate increase that became effective on July 1, 2013,driven primarily by an increase in sales volumesthe average PPFAC rate; and
$34 million in lower cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition.
The increase in net cash flows from warmer weatheroperating activities was partially offset by $16 million of higher cash paid for pension and retiree funding.
2014 compared with 2013
In 2014, net cash flows from operating activities decreased by $32 million compared to 2012, and2013 primarily due to:
$27 million of higher market pricescash paid for wholesale power; a $27 million decrease in operations and maintenanceacquisition-related costs and wagesincentive compensation primarily due to the 2014 acquisition; and
$6 million of higher cash paid net of amounts capitalized, due in part to renewable prepayments made in 2012; and a $6 million decrease in interest paid onfor capital lease obligations due to a decline in the balance of capital lease obligations.interest.
Investing Activities
2015 compared with 2014
In 2015, net cash flows used for investing activities decreased by $15 million compared with 2014 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.
The decrease in net cash flows used for investing activities was partially offset by:
$120 million purchase, in April 2015, of an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities partially offset by $24 million of cash received for the sale, in May 2015, of a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
$46 million purchase, in January 2015, of an additional 24.8% undivided ownership interest in Springerville Unit 1 increasing our total ownership interest to 49.5%;
$11 million in lower cash receipts for contributions in aid of construction received; and
$10 million of higher capital expenditures to fund system reinforcement through replacements and betterments.
Net2014 compared with 2013
In 2014, net cash flows used for investing activities increased by $258 million compared with 2013 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3;
$71 million of higher capital expenditures to fund the construction of new solar projects and improvements to our generating facilities; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.

27



Financing Activities
2015 compared with 2014
In 2015, net cash flows from financing activities decreased by $133 million compared with 2014 primarily due to:
$209 million in higher cash payments due to the purchase of $130 million in fixed rate tax-exempt long-term debt in January 2015, and the retirement of $79 million in variable rate tax-exempt bonds in August 2015;
$170 million in lower proceeds borrowed and higher repayments under TEP's revolving credit facilities;
$45 million in lower cash proceeds from UNS Energy's equity contributions; and
$10 million in higher cash dividend payments.
The decrease in net cash flows from financing activities was partially offset by:
$152 million in lower cash payments due to the expiration of capital lease obligations in 2015; and
$150 million in higher cash proceeds from the issuance of long-term debt, in February 2015.
2014 compared with 2013
In 2014, net cash flows from financing activities increased by $394 million compared with 2013 primarily due to:
$225 million in higher cash proceeds from UNS Energy's equity contributions made to complete the purchases for interest in Gila River Unit 3 and Springerville Unit 1;
$149 million in higher cash proceeds from the issuance of long-term debt; and
$85 million in higher cash borrowings (net of repayments) under TEP's revolving credit facilities.
The increase in net cash flows from financing activities was partially offset by $66 million in higher cash payments of capital lease obligations.
External Sources of Liquidity
Short-Term Investments
TEP’s short-term investment policy governs the investment of excess cash balances. We regularly review and update this policy in response to market conditions. At December 31, 2015, TEP's short-term investments included highly-rated and liquid money market funds.
Access to Revolving Credit Facilities
We have access to working capital through a revolving credit agreement with lenders. The 2015 Credit Agreement provides for a $250 million revolving credit commitment and LOC facility, due in October 2020. The LOC sublimit is $50 million. TEP expects that amounts borrowed under the credit agreement will be used for working capital and other general corporate purposes and that LOCs will be issued from time to time to support energy procurement and hedging transactions. No amounts were drawn under the 2015 Credit Agreement at December 31, 2015.
In June 2015, the 2014 Credit Agreement was terminated. In October 2015, the 2010 Credit Agreement was terminated.
For details on TEP's credit facilities see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Debt Financing
We use debt financing to lower our overall cost of capital. We are exposed to adverse changes in interest rates to the extent that we rely on variable rate financing. Our cost of capital is also affected by our credit ratings
In April 2015, we filed a financing application with the ACC. The application requests extending and expanding the existing financing authority to TEP by: (i) extending authority from December 2016 to December 2020; (ii) increasing the outstanding long-term debt limitation from $1.7 billion to $2.2 billion; (iii) allowing parent equity contributions of up to $400 million; and (iv) extending current interest rate hedging authority. The ACC issued an order granting such authority in January 2016.

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As discussed in 2013Part I, Item 1A. Risk Factors compared with of this Form 10-K, we may need to redeem or defease certain tax-exempt bonds outstanding. To the extent that is required, we would need to issue new taxable debt or enter into a new bank financing.
We have no new financing planned for 2016. TEP has, from time to time, refinanced or repurchased portions of its outstanding debt before scheduled maturity. Depending on market conditions, TEP may refinance other debt issuances or make additional debt repurchases in the future. For details on changes to or maturities on long-term debt, see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information2012. due
Debt Restrictive Covenants
The 2015 Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement contain pricing based on TEP’s credit ratings. A change in part to: a $19 million increase in capital expenditures; a $17 million increase in REC purchases due toTEP’s credit ratings can cause an increase in renewable energy PPAs; a $15 million decrease in proceeds from a note receivable; and a $10 millionor decrease in the returnamount of investmentinterest TEP pays on its borrowings, and the amount of fees it pays for its LOCs and unused commitments. Also, under certain agreements, should TEP fail to maintain compliance with covenants, lenders could accelerate the maturity of all amounts outstanding. At December 31, 2015, TEP was in Springervillecompliance with these covenants.
TEP conducts its wholesale marketing and risk management activities under certain master agreements whereby TEP may be required to post credit enhancements in the form of cash or a LOC due to exposures exceeding unsecured credit limits provided to TEP, changes in contract values, a change in TEP’s credit ratings, or if there has been a material change in TEP’s creditworthiness. As of December 31, 2015, TEP had posted less than $1 million in LOCs for credit enhancement with wholesale counterparties.
We do not have any provisions in any of our debt or lease debt.agreements that would cause an event of default or cause amounts to become due and payable in the event of a credit rating downgrade.
Credit Ratings
Our credit ratings affect our access to capital markets and supplemental bank financing. At December 31, 2015, TEP’s credit ratings for senior unsecured debt were A3 from Moody’s and BBB+ from both Standard & Poor’s and Fitch. As of February 2016, at TEP's request for commercial reasons, Fitch withdrew its rating on TEP.
TEP's credit ratings are dependent on a number of factors, both quantitative and qualitative, and are subject to change at any time. The disclosure of these credit ratings is not a recommendation to buy, sell, or hold TEP securities. Each rating should be evaluated independently of any other ratings.
Dividends
TEP declared and paid $50 million in dividends to UNS Energy in 2015 and $40 million in 2014 and 2013.
The ACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and reported to the ACC annually beginning on April 1, 2016. As of December 31, 2015, TEP had not yet reached the 50 percent of total capital and was therefore still restricted by the condition contained in the ACC's approval order.
Capital Expenditures
 Actual Estimated
 2013 2014 2015 2016 2017 2018
 Millions of Dollars
TEP$253
 $528
 $469
 $223
 $276
 $218
UNS Electric56
 95
 39
 33
 37
 49
UNS Gas17
 13
 13
 14
 15
 16
UNS Energy Consolidated$326
 $636
 $521
 $270
 $328
 $283
TEP's estimated capital expenditures include:
$164 million for the purchase of 75% of Gila River Unit 3 in 2014;
$65 million for the purchase of 35.4% of Springerville Unit 1 in 2014Utility Sales and 2015, and $73 million for TEP's share of the expected purchase of interests in the Springerville Coal Handling facilities in April 2015;
$147 million for TEP-related transmission investments during 2014 and 2015;

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$35 million for TEP's share of potential environmental expenditures related to the installation of SNCR at San Juan Unit 1. See Item 1 Business, TEP, Environmental Matters andNote 7; and
$38 million for TEP's share of the expected purchase of the Springerville Common Facilities upon the expiration of one of the two leases in 2017.
UNS Electric's estimated capital expenditures include the purchase of 25% of Gila River Unit 3 for approximately $55 million in 2014.
These estimates are subject to continuing review and adjustment. Actual capital expenditures may differ from these estimates due to changes in business conditions, construction schedules, environmental requirements, state or federal regulations and other factors. See Tucson Electric Power Company, Liquidity and Capital Resources, Investing Activities, Capital Expenditures.
Financing Activities
Net cash flows used for financing activities were $98 million higher in 2013 when compared with 2012 due to: a $10 million increase in scheduled capital lease payments; a $3 million increase in dividends paid on Common Stock; and the issuance of $150 million of long-term debt by TEP in 2012.
Capital Contributions
UNS Energy made no capital contributions to its subsidiaries in 2013 and 2012.
In 2011, UNS Energy contributed $20 million in capital to UNS Electric to help fund its purchase of BMGS from UED.
Also in 2011, UNS Energy contributed $30 million in capital to TEP to help fund the purchase of TEP’s headquarters building.
See  Tucson Electric Power Company, Liquidity and Capital Resources.
UNS Credit AgreementRevenues
The UNS Credit Agreement, which expires in November 2016, consiststable below provides a summary of a $125 million revolving creditretail kWh sales, revenues, and LOC facility. At December 31, 2013, there was $54 million outstanding at a weighted-average interest rate of 1.66%. The UNS Credit Agreement restricts additional indebtedness, liens, mergers,weather data during 2015, 2014 and sales of assets. The UNS Credit Agreement also requires UNS Energy to meet a minimum cash flow to debt service coverage ratio determined on a UNS Energy stand-alone basis. Additionally, UNS Energy cannot exceed a maximum leverage ratio determined on a consolidated basis. Under the terms of the UNS Credit Agreement, UNS Energy may pay dividends so long as it maintains compliance with the agreement. UNS Energy’s obligations under the agreement are secured by a pledge of the common stock of Millennium, UES, and UED.
At December 31, 2013, we were in compliance with the terms of the UNS Credit Agreement.
Interest Rate Risk
UNS Energy is subject to interest rate risk resulting from changes in interest rates on its borrowings under the revolving credit facility. The interest paid on revolving credit borrowings is variable. UNS Energy may be required to pay higher rates of interest on borrowings under its revolving credit facility if LIBOR and other benchmark interest rates increase. See Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

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Contractual Obligations
The following chart displays UNS Energy’s consolidated contractual obligations by maturity and by type of obligation as of December 31, 2013:
 UNS Energy Contractual Obligations
Payment Due in Years Ending December 31,2014 2015 2016 2017 2018 Thereafter Other Total
 Millions of Dollars
Long-Term Debt               
Principal(1) 
$
 $130
 $132
 $
 $100
 $1,146
 $
 $1,508
Interest(2)
67
 66
 61
 60
 61
 480
 
 795
Capital Lease Obligations(3)
214
 69
 17
 18
 11
 30
 
 359
Operating Leases4
 4
 3
 2
 2
 14
 
 29
Purchase Obligations(4):
               
Fuel(5)
103
 83
 80
 75
 49
 345
 
 735
Purchased Power75
 17
 
 
 
 
 
 92
Transmission7
 13
 12
 12
 11
 27
 
 82
Renewable Power Purchase Agreements (6)
36
 37
 37
 37
 37
 485
   669
RES Performance-Based Incentives(7)
9
 9
 9
 9
 9
 85
 
 130
Acquisition of Springerville Coal Handling & Common Facilities(8)

 120
 
 38
 
 68
 
 226
Other Long-Term Liabilities(9):
               
Pension & Other Post Retirement Obligations(10)
17
 6
 6
 6
 6
 33
 
 74
Unrecognized Tax Benefits
 
 
 
 
 
 4
 4
Total Contractual Obligations$532
 $554
 $357
 $257
 $286
 $2,713
 $4
 $4,703
 Year Ended Increase (Decrease) Year Ended Increase (Decrease)
 2015 2014 
Percent(1)
 2013 
Percent(1)
Electric Retail Sales (kWh in millions)         
Residential3,724
 3,727
 (0.1)% 3,867
 (3.6)%
Commercial2,124
 2,170
 (2.1)% 2,187
 (0.8)%
Industrial2,063
 2,098
 (1.7)% 2,114
 (0.8)%
Mining1,109
 1,137
 (2.5)% 1,079
 5.4 %
Public Authorities33
 33
  % 32
 3.1 %
Total Electric Retail Sales9,053
 9,165
 (1.2)% 9,279
 (1.2)%
Retail Margin Revenues (in millions)         
Residential$281
 $280
 0.4 % $271
 3.3 %
Commercial185
 188
 (1.6)% 181
 3.9 %
Industrial103
 104
 (1.0)% 97
 7.2 %
Mining38
 38
  % 34
 11.8 %
Public Authorities2
 2
  % 2
  %
Total by Customer Class609
 612
 (0.5)% 585
 4.6 %
LFCR Revenues12
 11
 9.1 % 2
 *
DSM Performance Bonus3
 2
 50.0 % 1
 100.0 %
Other Retail Margin Revenues5
 1
 *
 
 *
Total Retail Margin Revenues (Non-GAAP) (1)
629
 626
 0.5 % 588
 6.5 %
Fuel and Purchased Power Revenues344
 303
 13.5 % 300
 1.0 %
DSM and RES Surcharge Revenues49
 41
 19.5 % 46
 (10.9)%
Total Retail Revenues (GAAP)$1,022
 $970
 5.4 % $934
 3.9 %
Average Retail Margin Rate (Cents / kWh) (2)
         
Residential7.55
 7.51
 0.5 % 7.02
 7.0 %
Commercial8.71
 8.66
 0.6 % 8.28
 4.6 %
Industrial4.99
 4.96
 0.6 % 4.61
 7.6 %
Mining3.43
 3.34
 2.7 % 3.14
 6.4 %
Public Authorities5.61
 6.06
 (7.4)% 5.56
 9.0 %
Total Average Margin Rate by Customer Class6.73
 6.68
 0.7 % 6.30
 6.0 %
Total Average Retail Margin Rate (3)
6.95
 6.80
 2.2 % 6.31
 7.8 %
Average Fuel and Purchased Power Rate3.80
 3.31
 14.8 % 3.24
 2.2 %
Average DSM and RES Rate0.54
 0.48
 12.5 % 0.52
 (7.7)%
Total Average Retail Rate11.29
 10.59
 6.6 % 10.07
 5.2 %
Weather Data
 
 
 
 
Cooling Degree Days         
Year Ended December 31,1,576
 1,557
 1.2 % 1,631
 (4.5)%
10-Year Average1,520
 1,515
 *
 1,491
 *
Heating Degree Days         
Year Ended December 31,1,072
 930
 15.3 % 1,449
 (35.8)%
10-Year Average1,317
 1,335
 *
 1,404
 *
* Not meaningful
(1) 
CertainRetail Margin Revenues, a non-GAAP financial measure, should not be considered as an alternative to Total Retail Revenues, which is determined in accordance with GAAP. Retail Margin Revenues exclude: (i) revenues collected from retail customers that are

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directly offset by expenses recorded in other line items; and (ii) revenues collected from third parties that are unrelated to kWh sales to retail customers. We believe the change in Retail Margin Revenues between periods provides useful information because it demonstrates the underlying revenue trend and performance of our core utility business. Retail Margin Revenues represents the portion of retail operating revenues from kWh sales, LFCR Revenues, DSM Performance Bonus, and certain other retail margin revenues available to cover the non-fuel operating expenses of our core utility business.
(2)
Calculated on un-rounded data and may not correspond exactly to data shown in table.
(3)
Total Average Retail Margins Rates include revenues related to LFCR Revenues, DSM Performance Bonus, and Other Retail Margin Revenues included in the Total Retail Margin Revenues.
Retail Revenues were higher in 2015 compared with 2014 primarily due to the increase in the PPFAC rate and higher Retail Margin Revenues. Retail Margin Revenues were higher primarily due to higher LFCR revenues, DSM Performance Bonus, and Other Retail Margin Revenues related to adjustor mechanisms.
Retail Revenues were higher in 2014 compared with 2013 primarily due to higher Retail Margin Revenues and increased LFCR revenues. The increase in Retail Margin Revenues resulted from a non-fuel Base Rate increase effective July 1, 2013. These increases were partially offset by lower sales volume due to milder weather.
Wholesale Sales and Transmission Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Long-Term Wholesale Revenues$36

$28
 $26
Transmission Revenues27
 16
 15
Short-Term Wholesale Revenues104
 114
 92
Total Electric Wholesale Sales$167
 $158
 $133
Long-Term Wholesale Revenues increased by $8 million, or 29%, in 2015 compared with 2014 primarily due to new wholesale agreements partially offset by unfavorable wholesale market prices. Transmission Revenues increased by $11 million, or 69%, in 2015 compared with 2014 primarily due to a new long-term transmission agreement with UNS Electric related to Gila River and contract renewals resulting in favorable pricing.
Long-Term Wholesale Revenues increased by $2 million, or 8%, in 2014 compared with 2013 primarily due to favorable market prices for wholesale power. There were no significant changes in transmission revenues in 2014 compared to 2013.
The majority of revenues from short-term wholesale sales are related to ACC jurisdictional assets and are credited against the fuel and purchased power costs eligible for recovery in the PPFAC.
Other Revenues
 Year Ended December 31,
(in millions)2015 2014 2013
Springerville Units 3 and 4 Revenue (1)
$91
 $112
 $102
Other Revenue27
 29
 28
Total Other Revenue$118
 $141
 $130
(1)
Represents revenues and reimbursements from Tri-State, the lessee of TEP’s variable rate industrial development revenue bonds (IDBs) or pollution control revenue bonds are secured by LOCs issued pursuantSpringerville Unit 3, and SRP, the owner of Springerville Unit 4, to TEP related to the TEP Credit Agreement, which expiresoperation of these plants.
In addition to reimbursements related to Springerville Units 3 and 4, TEP’s other revenues include inter-company revenues from its affiliates, UNS Gas, Inc., an indirect wholly-owned subsidiary of UNS Energy, (UNS Gas) and UNS Electric, for corporate services provided by TEP, and miscellaneous service-related revenues such as rent on power pole attachments, damage claims, and customer late fees. See Note 5 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding related party transactions.
There were no significant changes in Other Revenue in 2015 compared with 2014, as well as no significant changes in Other Revenue in 2014 compared with 2013.

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Operating Expenses
Generating Output and Fuel and Purchased Power Expense
TEP’s fuel and purchased power expense and energy resources for 2015, 2014, and 2013 are detailed below:
 Generation and Purchased Power (kWh) Fuel and Purchased Power Expense
(in millions)2015 2014 2013 2015 2014 2013
Coal-Fired Generation8,584
 9,271
 10,254
 $209
 $232
 $273
Gas-Fired Generation2,723
 1,210
 1,007
 91
 60
 46
Utility Owned Renewable Generation65
 48
 38
 
 
 
Reimbursed Fuel Expense for Springerville Units 3 and 4 (1)

 
 
 5
 5
 7
Total Generation11,372
 10,529
 11,299
 305
 297
 326
Total Purchased Power3,079
 3,195
 2,329
 125
 153
 112
Transmission and Other PPFAC Recoverable Costs
 
 
 25
 18
 12
Increase (Decrease) to Reflect PPFAC Recovery Treatment
 
 
 40
 (11) (12)
Total Generation and Purchased Power14,451
 13,724
 13,628
 $495
 $457
 $438
Less Line Losses and Company Use(719) (859) (885)      
Total Energy Sold13,732
 12,865
 12,743
      
(1)
Springerville Unit 3 and 4 Fuel Expense is reimbursed by Tri-State and SRP.
Fuel and Purchased Power Expense increased by $38 million, or 8%, in 2015 compared with 2014 primarily due to an increase in the PPFAC charge and additional generation and transmission costs associated with Gila River Unit 3. The increase was partially offset by favorable purchased power costs (see table below) and decreased coal generation at Springerville Unit 1 as a result of the lease expiration in January 2015.
Fuel and Purchased Power Expense increased by $19 million, or 4%, in 2014 compared with 2013 primarily due to the increase in purchased power volumes resulting from outages at Springerville and Sundt generating stations in 2014. The increase was partially offset by a decrease in generation expense as a result of the outages.
See the table below for information on the average fuel cost of generated and purchased kWh:
(cents per kWh)2015 2014 2013
Coal2.44
 2.50
 2.66
Gas3.35
 4.99
 4.57
Purchased Power4.05
 4.79
 4.83
All Sources3.31
 3.64
 3.54
Operations and Maintenance Expense
The table below summarizes the items included in Operations and Maintenance (O&M) expense:
(in millions)2015 2014 2013
Reimbursed Expenses - Springerville Units 3 and 4 (1)
$65
 $84
 $70
Reimbursed Expenses - Customer Funded Renewable Energy and
DSM Programs (2)
25
 23
 26
Other Operating and Maintenance Expense (3)
255
 272
 239
Total Operations and Maintenance Expense$345
 $379
 $335
(1)
Expenses related to Springerville Units 3 and 4 are reimbursed with corresponding amounts recorded in 2016, and the 2010 TEP Reimbursement Agreement, which expires in 2019. Although the $115 million of variable rate bonds mature between 2022 and 2032, the above maturity reflects a redemption or repurchase of such bonds as though the LOCs terminate without replacement upon expiration of the TEP Credit Agreement in 2016 (that supports $78 million of variable rate bonds) and the 2010 TEP Reimbursement Agreement in 2019 (that supports $37 million of variable rate bonds). Additionally, TEP's 2013 variable-rate IDBs, which mature in 2032, are subject to mandatory tender for purchase after the current five-year term and are therefore reflected as maturing in 2018. Excludes approximately $1 million of debt discount.other revenue.
(2) 
Excludes interest on revolving credit facilitiesThese expenses are being collected from customers and includes interest on TEP's 2013 tax-exempt IDBs through the end of the current five-year term.corresponding amounts are recorded in retail revenue.
(3) 
Capital lease obligations include the purchaseThe Third-Party Owners' share of expenses related to Springerville Unit 1 is included in December 2014Other Operating and January 2015. See Note 6. Effective with commercial operation of Springerville Unit 3 in July 2006 and Unit 4 in December 2009, Tri-State and SRP are reimbursing TEP for various operating costs related to the common facilities on an ongoing basis, including a total of $14 million annually related to the Springerville Common and Springerville Coal Handling Facilities Leases. TEP remains the obligor under these capital leases, and Capital Lease Obligations do not reflect any reduction associated with this reimbursement.Maintenance Expense.

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Operating and Maintenance expenses decreased by $34 million, or 9%, in2015 compared with 2014. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, decreased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense decreased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014, partially offset by higher O&M related to Gila River, labor costs and outside services.
Operating and Maintenance expenses increased by$44 million, or 13%, in 2014 compared with 2013. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, increased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense increased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014.

FACTORS AFFECTING RESULTS OF OPERATIONS
2015 Rate Case
In November 2015, TEP filed a general rate case with the ACC to: (i) update and improve its rate design and tariffs to provide more accurate price signals and a more equitable allocation of its fixed costs to its customers; (ii) provide TEP with an opportunity to recover its full cost of service, including an appropriate return on its rate base investments; and (iii) enable TEP to continue to provide safe and reliable service. The rate application is based on a test year ended June 30, 2015. The filing requests that new rates be implemented by January 1, 2017.
The key provisions of the rate case include:
a Base Rate increase of $110 million, or 12%, compared with adjusted test year revenues;
a 7.34% return on original cost rate base of $2.1 billion;
a capital structure for rate making purposes of approximately 50% common equity and 50% long-term debt;
a cost of equity of 10.35% and an average cost of debt of 4.32%;
a request to apply excess depreciation reserves against the unrecovered net book value (NBV) of San Juan Unit 2 and the Sundt Coal Handling Facilities due to early retirement;
a request for authority to begin using the Third-Party Owners' portion of Springerville Unit 1 that is available to TEP for dispatch to serve retail customer needs and to recover the related operating costs through the PPFAC; and
rate design changes that would reduce the reliance on volumetric sales to recover fixed costs, and a new net metering tariff that would ensure that customers who install distributed generation pay an equitable price for their electric service.
TEP cannot predict the outcome of this proceeding or whether its rate request will be adopted by the ACC in whole or in part.
Generating Resources
At December 31, 2015, approximately 49% of TEP's generating capacity was fueled by coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating additional steps to reduce its dependency on coal generation.
In August 2015, TEP exhausted its existing coal supply at Unit 4 of the H. Wilson Sundt Generating Station (Sundt Unit 4). Currently, TEP is operating Sundt Unit 4 on natural gas as a primary fuel source.
TEP's ability to further reduce its coal-fired generating capacity will depend on several factors, including, but not limited to:
The impact of the Clean Power Plan on current coal-fired generating facilities; and
The ability to resolve Springerville Unit 1 legal proceedings relating to the Third-Party Owners.
See Part I, Item 1. Business, General for additional information regarding TEP's generating facilities.

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Springerville Unit 1
TEP leased Unit 1 of the Springerville Generating Station and an undivided one-half interest in certain Springerville Common Facilities (collectively Springerville Unit 1) under seven separate lease agreements (Springerville Unit 1 Leases) that were accounted for as capital leases. The leases expired in January 2015. At that time, TEP purchased a leased interest comprising 24.8% of Springerville Unit 1, representing 96 MW of capacity, for an aggregate purchase price of $46 million. Following this purchase, TEP owns 49.5% of Springerville Unit 1, or 192 MW of capacity.
The remaining 50.5% of Springerville Unit 1, or 195 MW of capacity, is owned by Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the Third-Party Owners’ generating output. TEP is obligated to operate the unit for the Third-Party Owners. Owner Trustees and Co-Trustees are obligated to compensate TEP for their pro rata share of expenses for the unit. TEP estimates the Third-Party Owners’ share of 2016 operations and maintenance expense will be $27 million and their estimated share of 2016 capital expenditures will be $9 million.
In April 2015, TEP filed a demand for arbitration seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expense and capital expenditures for Springerville Unit 1. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part I, Item 3. Legal Proceedings for additional information regarding the legal proceedings relating to the Third-Party Owners.
Potential Plant Retirements
TEP's 2014 Integrated Resource Plan (IRP), which was acknowledged by the ACC in April 2015, reflected plans to reduce its overall coal capacity by 492 MW (32% of TEP's existing coal fleet) by 2018. TEP's 2014 IRP included retiring certain coal-fired generating facilities at San Juan Generating Station (San Juan) and coal handling facilities at the H. Wilson Sundt Generating Station (Sundt) earlier than their current estimated useful lives. These facilities currently do not have the requisite emission control equipment to meet proposed Environmental Protection Agency (EPA) regulations. TEP plans to seek regulatory recovery for amounts that would not otherwise be recovered if and when any assets are retired. TEP plans to file a preliminary IRP in March 2016 and is required to file its next IRP by April 2017.
See Part I, Item 1. Business, Environmental Matters for additional information regarding the impact of environmental matters on plant operations.
Springerville Coal Handling Facilities Capital Lease Purchase
TEP previously leased interests in the coal handling facilities at the Springerville Generating Station (Springerville Coal Handling Facilities) under two separate lease agreements (Springerville Coal Handling Facilities Leases). The lease agreements had an initial term that expired in April 2015 and provided TEP the option to renew the leases or to purchase the leased interests at the aggregate fixed price of $120 million. In April 2015, TEP exercised its option to purchase the facilities.
Upon the expiration of the lease term, TEP purchased an 86.7% undivided ownership interest in the Springerville Coal Handling Facilities bringing TEP's total ownership interest to 100%. With the completion of the purchase, SRP was obligated to buy a 17.05% undivided interest in the Springerville Coal Handling Facilities from TEP for approximately $24 million. This transaction was completed in May 2015. Tri-State, is obligated to either: 1) buy a 17.05% undivided interest in the facilities for approximately $24 million or 2) continue to make payments to TEP for the use of the facilities. Tri-State has until April 2016 to exercise its purchase option.
Sales to Mining Customers
TEP's largest mining customer is taking initial steps to curtail production in 2016 due to the decline in commodity prices. TEP cannot predict the extent to which this customer will curtail production, how long commodity prices will remain low, or the

25



total impact the prices will have on mining production in the future. At December 31, 2015, mining customers made up 8% of TEP's total electric sales.
The proposed Rosemont Copper Mine near Tucson, Arizona is in the permitting stage. If the Rosemont Copper Mine is constructed and reaches full production, it will become TEP's largest retail customer with an estimated load of approximately 85 to 120 MW.
Interest Rates
See Part II, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for information regarding interest rate risks and its impact on earnings.

LIQUIDITY AND CAPITAL RESOURCES
Liquidity
Cash flows may vary during the year, with cash flows from operations typically the lowest in the first quarter and highest in the third quarter due to TEP’s summer peaking load. As a result of the varied seasonal cash flow, we will use, as needed, our revolving credit facility to assist in funding business activities. We believe that we have sufficient liquidity under our revolving credit facilities to meet short-term working capital needs and to provide credit enhancement as necessary under energy procurement and hedging agreements.
Available Liquidity
(in millions)As of December 31, 2015
Cash and Cash Equivalents$56
Amount Available under Revolving Credit Facility (1)
250
Total Liquidity$306
(4)(1) 
Excludes the acquisitionTEP's revolving credit facility, which matures in 2020, provides for a $250 million revolving credit commitment with a LOC sublimit of Gila River Unit 3 pending regulatory approvals. See Note 8.$50 million.
(5)
Future Liquidity Requirements
We expect to meet all of our financial obligations and other anticipated cash outflows for the foreseeable future. These obligations and anticipated cash outflows include, but are not limited to, dividend payments, debt maturities, and obligations included in the Contractual Obligations and forecasted Capital Expenditures tablesbelow.
See Part III, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for additional information regarding TEP's market risks and Note 6of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's financing arrangements.
Summary of Cash Flow
The table below presents net cash provided by (used for) operating, investing and financing activities:
 Year Ended 
Increase
(Decrease)
 Year Ended 
Increase
(Decrease)
(in millions)2015 2014 Percent 2013 Percent
Operating Activities$365
 $314
 16.2 % $346
 (9.2)%
Investing Activities(503) (518) (2.9)% (260) 99.2 %
Financing Activities120
 253
 (52.6)% (141) 279.4 %
Net Increase (Decrease) in Cash(18) 49
 (136.7)% (55) 189.1 %
Cash, Beginning of Year74
 25
 196.0 % 80
 (68.8)%
Cash, End of Year$56
 $74
 (24.3)% $25
 196.0 %
Cash Flows for both 2015 and 2014 included unusually large capital expenditures. These capital requirements were met with a combination of equity contributions from UNS Energy and long-term borrowings as discussed in Financing Activities below.
Excludes TEP’s liability for final environmental reclamation at the coal mines which supply the Navajo, San Juan and Four Corners generating stations as the timing of payment has not been determined. See Note 7.
(6)
TEP and UNS Electric have entered into 20-year PPAs with renewable energy generation producers to comply with the RES tariff. TEP and UNS Electric are obligated to purchase 100% of the output of these facilities. The table above includes estimated future payments based on expected power deliveries under these contracts. TEP and UNS Electric have entered into additional long-term renewable PPAs to comply with the RES; however, TEP's and UNS Electric's obligations to accept and pay for electric power under these agreements does not begin until the facilities are operational.
(7)
TEP and UNS Electric have entered into REC purchase agreements to purchase the environmental attributes from retail customers with solar installations. Payments for the RECs are termed Performance Based Incentives (PBIs) and are paid in contractually agreed upon intervals (usually quarterly) based on metered renewable energy production. PBIs are recoverable through the RES tariff. See Note 3.

K-4026


(8)
In 2015, we issued long-term debt and used the proceeds to repay revolving and term loans under our credit agreements and pay a portion of the purchase price for interests in the Springerville Coal Handling Facilities. In addition, we received an equity contribution from UNS Energy and used the proceeds to repay the outstanding balances under our revolving credit facilities and redeem long-term variable rate tax-exempt bonds which were called for redemption in June 2015.
In 2014, we received an equity contribution from UNS Energy and used the proceeds to pay for the purchase of both Gila River Unit 3 and Springerville Unit 1 leased assets.
Operating Activities
2015 compared with 2014
In 2015, net cash flows from operating activities increased by $51 million compared to 2014 primarily due to:
$39 million of higher cash receipts from retail and wholesale sales, net of fuel and purchased power costs paid driven primarily by an increase in the average PPFAC rate; and
$34 million in lower cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition.
The increase in net cash flows from operating activities was partially offset by $16 million of higher cash paid for pension and retiree funding.
2014 compared with 2013
In 2014, net cash flows from operating activities decreased by $32 million compared to 2013 primarily due to:
$27 million of higher cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition; and
$6 million of higher cash paid for capital lease interest.
Investing Activities
2015 compared with 2014
In 2015, net cash flows used for investing activities decreased by $15 million compared with 2014 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.
The decrease in net cash flows used for investing activities was partially offset by:
$120 million purchase, in April 2015, of an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities partially offset by $24 million of cash received for the sale, in May 2015, of a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
$46 million purchase, in January 2015, of an additional 24.8% undivided ownership interest in Springerville Unit 1 increasing our total ownership interest to 49.5%;
$11 million in lower cash receipts for contributions in aid of construction received; and
$10 million of higher capital expenditures to fund system reinforcement through replacements and betterments.
2014 compared with 2013
In 2014, net cash flows used for investing activities increased by $258 million compared with 2013 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3;
$71 million of higher capital expenditures to fund the construction of new solar projects and improvements to our generating facilities; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.

27



Financing Activities
2015 compared with 2014
In 2015, net cash flows from financing activities decreased by $133 million compared with 2014 primarily due to:
$209 million in higher cash payments due to the purchase of $130 million in fixed rate tax-exempt long-term debt in January 2015, and the retirement of $79 million in variable rate tax-exempt bonds in August 2015;
$170 million in lower proceeds borrowed and higher repayments under TEP's revolving credit facilities;
$45 million in lower cash proceeds from UNS Energy's equity contributions; and
$10 million in higher cash dividend payments.
The decrease in net cash flows from financing activities was partially offset by:
$152 million in lower cash payments due to the expiration of capital lease obligations in 2015; and
$150 million in higher cash proceeds from the issuance of long-term debt, in February 2015.
2014 compared with 2013
In 2014, net cash flows from financing activities increased by $394 million compared with 2013 primarily due to:
$225 million in higher cash proceeds from UNS Energy's equity contributions made to complete the purchases for interest in Gila River Unit 3 and Springerville Unit 1;
$149 million in higher cash proceeds from the issuance of long-term debt; and
$85 million in higher cash borrowings (net of repayments) under TEP's revolving credit facilities.
The increase in net cash flows from financing activities was partially offset by $66 million in higher cash payments of capital lease obligations.
External Sources of Liquidity
Short-Term Investments
TEP’s short-term investment policy governs the investment of excess cash balances. We regularly review and update this policy in response to market conditions. At December 31, 2015, TEP's short-term investments included highly-rated and liquid money market funds.
Access to Revolving Credit Facilities
TEP has agreed with the owners of Springerville Units 3 and 4 that, prior to expiration of the Springerville Coal Handling Facilities and Common Facilities Leases, TEP will either renew such leases or exercise its fixed price purchase option under such leases and acquire the leased facilities. TEP has the option of purchasing the facilities at the end of the initial lease term or after one or more renewal periods through 2025 for the Springerville Common Facilities and through 2035 for the Springerville Coal Handling Facilities. The table above reflects the purchase as if TEP exercised the fixed price purchase option at the end of the initial lease term. Upon such acquisitions by TEP, the owner of Springerville Unit 3 and the owner of Springerville Unit 4 have the obligation to purchase from TEP a 17% interest in the Springerville Coal Handling Facilities and a 14% interest in the Springerville Common Facilities.
(9)
Excludes asset retirement obligations expected to occur through 2066.
(10)
These obligations represent TEP’s and UES’ expected contributions to pension plans in 2014, TEP’s expected benefit payments for its unfunded Supplemental Executive Retirement Plan (SERP), and TEP’s expected retiree benefit costs to cover medical and life insurance claims as determined by the plans’ actuaries. TEP and UES do not know and have not included pension and retiree benefit contributions beyond 2014 for their funded plans due to the significant impact that returns on plan assets and changes in discount rates might have on such amounts.
We have reviewedaccess to working capital through a revolving credit agreement with lenders. The 2015 Credit Agreement provides for a $250 million revolving credit commitment and LOC facility, due in October 2020. The LOC sublimit is $50 million. TEP expects that amounts borrowed under the credit agreement will be used for working capital and other general corporate purposes and that LOCs will be issued from time to time to support energy procurement and hedging transactions. No amounts were drawn under the 2015 Credit Agreement at December 31, 2015.
In June 2015, the 2014 Credit Agreement was terminated. In October 2015, the 2010 Credit Agreement was terminated.
For details on TEP's credit facilities see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Debt Financing
We use debt financing to lower our contractual obligationsoverall cost of capital. We are exposed to adverse changes in interest rates to the extent that we rely on variable rate financing. Our cost of capital is also affected by our credit ratings
In April 2015, we filed a financing application with the ACC. The application requests extending and provideexpanding the followingexisting financing authority to TEP by: (i) extending authority from December 2016 to December 2020; (ii) increasing the outstanding long-term debt limitation from $1.7 billion to $2.2 billion; (iii) allowing parent equity contributions of up to $400 million; and (iv) extending current interest rate hedging authority. The ACC issued an order granting such authority in January 2016.

28



As discussed in Part I, Item 1A. Risk Factors of this Form 10-K, we may need to redeem or defease certain tax-exempt bonds outstanding. To the extent that is required, we would need to issue new taxable debt or enter into a new bank financing.
We have no new financing planned for 2016. TEP has, from time to time, refinanced or repurchased portions of its outstanding debt before scheduled maturity. Depending on market conditions, TEP may refinance other debt issuances or make additional information:debt repurchases in the future. For details on changes to or maturities on long-term debt, see Note 6 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Debt Restrictive Covenants
The 2015 Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement contain pricing based on TEP’s credit ratings. A change in TEP’s credit ratings can cause an increase or decrease in the amount of interest TEP pays on its borrowings, and the amount of fees it pays for its LOCs and unused commitments. Also, under certain agreements, should TEP fail to maintain compliance with covenants, lenders could accelerate the maturity of all amounts outstanding. At December 31, 2015, TEP was in compliance with these covenants.
TEP conducts its wholesale marketing and risk management activities under certain master agreements whereby TEP may be required to post credit enhancements in the form of cash or a LOC due to exposures exceeding unsecured credit limits provided to TEP, changes in contract values, a change in TEP’s credit ratings, or if there has been a material change in TEP’s creditworthiness. As of December 31, 2015, TEP had posted less than $1 million in LOCs for credit enhancement with wholesale counterparties.
We do not have any provisions in any of our debt or lease agreements that would cause an event of default or cause amounts to become due and payable in the event of a credit rating downgrade.
NoneCredit Ratings
Our credit ratings affect our access to capital markets and supplemental bank financing. At December 31, 2015, TEP’s credit ratings for senior unsecured debt were A3 from Moody’s and BBB+ from both Standard & Poor’s and Fitch. As of our contractsFebruary 2016, at TEP's request for commercial reasons, Fitch withdrew its rating on TEP.
TEP's credit ratings are dependent on a number of factors, both quantitative and qualitative, and are subject to change at any time. The disclosure of these credit ratings is not a recommendation to buy, sell, or financing arrangements contains acceleration clauses orhold TEP securities. Each rating should be evaluated independently of any other consequences triggered by changesratings.
Dividends
TEP declared and paid $50 million in our stock price.
Income Tax Positiondividends to UNS Energy in 2015 and $40 million in 2014 and 2013.
The 2010 Federal Tax Relief ActACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and the American Taxpayer Relief Act of 2012 include provisions that make qualified property placed in service between 2010 and 2013 eligible for bonus depreciation for tax purposes. In addition, the IRS issued new guidance relatedreported to the treatmentACC annually beginning on April 1, 2016. As of expenditures to maintain, replace, or improve property. These provisions are an accelerationDecember 31, 2015, TEP had not yet reached the 50 percent of tax benefits UNS Energytotal capital and TEP otherwise would have received over 20 years. As a result of these provisions, UNS Energy and TEP do not expect to pay any federal or state income taxes through 2017.


TUCSON ELECTRIC POWER COMPANY
RESULTS OF OPERATIONS
TEP’s financialwas therefore still restricted by the condition and results of operations are the principal factors affecting the financial condition and results of operations of UNS Energy. The following discussion relates to TEP, unless otherwise noted.
2013 compared with 2012
TEP reported net income of $101 million in 2013 compared with net income of $65 million in 2012. The following factors affected TEP’s results in 2013:
a $41 million increase in retail margin revenues due to a non-fuel base rate increase that was effective on July 1, 2013, $2 million of LFCR revenues recordedcontained in the fourth quarter of 2013, and favorable weather during 2013 compared with the same period last year. Favorable weather conditions contributed to a 0.2% increase in retail kilowatt-hour (kWh) sales during 2013;
a $2 million increase in the margin on long-term wholesale sales due in part to an increase in the market price for wholesale power;
a $3 million increase in pre-tax income related to the operation of Springerville Units 3 and 4. An unplanned outage at Springerville Unit 3 negatively affected results in 2012;
a $9 million decrease in interest expense due to a reduction in the balance of capital lease obligations;
an $11 million tax benefit related to a regulatory asset recorded in June 2013 to recover previously recorded income tax expense through future rates as a result of the 2013 TEP Rate Order. See Note 9; and

K-41


a $5 million increase in pre-tax income as a result of the 2012 write-off of a portion of the planned Tucson to Nogales transmission line;
partially offset by
a charge of $3 million recorded to fuel and purchased energy expense resulting from the 2013 TEP Rate Order. See Factors Affecting Results of Operations, Purchased Power and Fuel Adjustor Clause, below;
a $12 million increase in Base O&M due in part to higher planned and unplanned generating plant maintenance expense, as well as merger-related expenses of $6 million recorded in December 2013; and
a $3 million increase in taxes other than income taxes due in part to an increase in property tax rates and higher asset balances.
2012 compared with 2011
TEP reported net income of $65 million in 2012 compared with net income of $85 million in 2011. The following factors contributed to the decrease in TEP's net income:
a $7 million decline in retail margin revenues resulting from lower retail kWh sales due to milder summer weather than 2011, as well as the effects of the ACC's energy efficiency and distributed generation requirements;approval order.
an $8 million decline in long-term wholesale margin revenues resulting primarily from a change in the pricing of energy sold under the SRP wholesale contract effective June 1, 2011;
a $3 million decrease in pre-tax income related to the operation of Springerville Units 3 and 4. An unplanned outage at Springerville Unit 3 negatively affected results in 2012;
a $7 million pre-tax gain recorded in 2011 related to the settlement of a dispute with El Paso Electric;
an $11 million increase in depreciation and amortization expense as a result of an increase in utility plant-in-service; and
a $5 million decrease in pre-tax income as a result of the write-off of a portion of the planned Tucson to Nogales transmission line;
partially offset by
a $4 million decrease in Base O&M primarily due to lower planned generating plant maintenance expense at San Juan.

K-42


Utility Sales and Revenues
The table below provides a summary of TEP’s retail kWh sales, revenues, and weather data during 2013, 2012,2015, 2014 and 2011:2013:
2013 2012 
Percent(1)
 2011 
Percent(1)
Year Ended Increase (Decrease) Year Ended Increase (Decrease)
Energy Sales, kWh (in Millions):         
Electric Retail Sales:         
2015 2014 
Percent(1)
 2013 
Percent(1)
Electric Retail Sales (kWh in millions)         
Residential3,867
 3,821
 1.2 % 3,888
 (1.7)%3,724
 3,727
 (0.1)% 3,867
 (3.6)%
Commercial(2)
2,187
 2,187
  % 2,184
 0.2 %2,124
 2,170
 (2.1)% 2,187
 (0.8)%
Industrial2,114
 2,132
 (0.9)% 2,145
 (0.6)%2,063
 2,098
 (1.7)% 2,114
 (0.8)%
Mining1,079
 1,093
 (1.2)% 1,083
 0.9 %1,109
 1,137
 (2.5)% 1,079
 5.4 %
Other(2)
32
 32
 1.6 % 32
 0.7 %
Public Authorities33
 33
  % 32
 3.1 %
Total Electric Retail Sales9,279
 9,265
 0.2 % 9,332
 (0.7)%9,053
 9,165
 (1.2)% 9,279
 (1.2)%
Retail Margin Revenues (in Millions):         
Retail Margin Revenues (in millions)         
Residential$271
 $248
 9.3 % 252
 (1.4)%$281
 $280
 0.4 % $271
 3.3 %
Commercial181
 171
 5.9 % 170
 0.5 %185
 188
 (1.6)% 181
 3.9 %
Industrial97
 93
 5.4 % 95
 (2.5)%103
 104
 (1.0)% 97
 7.2 %
Mining34
 30
 11.5 % 32
 (3.8)%38
 38
  % 34
 11.8 %
Other2
 2
 5.9 % 2
 (15.0)%
Total Retail Margin Revenues (Non-GAAP)(3)
585
 544
 7.7 % 551
 (1.2)%
Public Authorities2
 2
  % 2
  %
Total by Customer Class609
 612
 (0.5)% 585
 4.6 %
LFCR Revenues12
 11
 9.1 % 2
 *
DSM Performance Bonus3
 2
 50.0 % 1
 100.0 %
Other Retail Margin Revenues5
 1
 *
 
 *
Total Retail Margin Revenues (Non-GAAP) (1)
629
 626
 0.5 % 588
 6.5 %
Fuel and Purchased Power Revenues300
 327
 (8.1)% 307
 6.5 %344
 303
 13.5 % 300
 1.0 %
RES, DSM, ECA and LFCR Revenues49
 45
 6.8 % 46
 (2.6)%
DSM and RES Surcharge Revenues49
 41
 19.5 % 46
 (10.9)%
Total Retail Revenues (GAAP)$934
 $916
 2.0 % 904
 1.3 %$1,022
 $970
 5.4 % $934
 3.9 %
Average Retail Margin Rate (Cents / kWh):(1)
         
Average Retail Margin Rate (Cents / kWh) (2)
         
Residential7.02
 6.50
 8.0 % 6.48
 0.3 %7.55
 7.51
 0.5 % 7.02
 7.0 %
Commercial8.28
 7.82
 5.9 % 7.80
 0.3 %8.71
 8.66
 0.6 % 8.28
 4.6 %
Industrial4.61
 4.33
 6.5 % 4.42
 (2.0)%4.99
 4.96
 0.6 % 4.61
 7.6 %
Mining3.14
 2.78
 12.9 % 2.92
 (4.8)%3.43
 3.34
 2.7 % 3.14
 6.4 %
Other5.56
 5.34
 4.1 % 6.32
 (15.5)%
Average Retail Margin Revenue6.31
 5.87
 7.5 % 5.90
 (0.5)%
Average Fuel and Purchased Power Revenue3.24
 3.52
 (8.0)% 3.29
 7.0 %
Average RES, DSM, ECA and LFCR Revenue0.52
 0.49
 6.1 % 0.50
 (2.0)%
Total Average Retail Revenue10.07
 9.88
 1.9 % 9.69
 2.0 %
         
Weather Data:         
Public Authorities5.61
 6.06
 (7.4)% 5.56
 9.0 %
Total Average Margin Rate by Customer Class6.73
 6.68
 0.7 % 6.30
 6.0 %
Total Average Retail Margin Rate (3)
6.95
 6.80
 2.2 % 6.31
 7.8 %
Average Fuel and Purchased Power Rate3.80
 3.31
 14.8 % 3.24
 2.2 %
Average DSM and RES Rate0.54
 0.48
 12.5 % 0.52
 (7.7)%
Total Average Retail Rate11.29
 10.59
 6.6 % 10.07
 5.2 %
Weather Data
 
 
 
 
Cooling Degree Days                  
Year Ended December 31,1,631
 1,556
 4.8 % 1,528
 1.8 %1,576
 1,557
 1.2 % 1,631
 (4.5)%
10-Year Average1,491
 1,484
 NM
 1,473
 NM
1,520
 1,515
 *
 1,491
 *
Heating Degree Days                  
Year Ended December 31,1,449
 1,201
 20.6 % 1,597
 (24.8)%1,072
 930
 15.3 % 1,449
 (35.8)%
10-Year Average1,404
 1,394
 NM
 1,417
 NM
1,317
 1,335
 *
 1,404
 *
* Not meaningful
(1)
Calculated on un-rounded data and may not correspond exactly to data shown in table.
(2)
Retail kWh sales to commercial and other customers for 2012 and 2011 have been adjusted to reflect a change in the methodology for counting customers resulting from rate design changes from the 2013 TEP Rate Order.
(3) 
Retail Margin Revenues, a non-GAAP financial measure, should not be considered as an alternative to Total Retail Revenues, which is determined in accordance with GAAP. Retail Margin Revenues exclude: (i) revenues collected from retail customers that are

21



directly offset by expenses recorded in other line items; and (ii) revenues collected from third parties that are unrelated to kWh sales to retail customers. We believe the change in Retail Margin Revenues between periods provides useful information because it demonstrates the underlying revenue trend and performance of our core utility business. Retail Margin Revenues represents the portion of retail operating revenues from kWh sales, LFCR Revenues, DSM Performance Bonus, and certain other retail margin revenues available to cover the non-fuel operating expenses of our core utility business.
(2)
Calculated on un-rounded data and may not correspond exactly to data shown in table.
(3)
Total Average Retail Margins Rates include revenues related to LFCR Revenues, DSM Performance Bonus, and Other Retail Margin Revenues between periods provides useful information to investors because it demonstratesincluded in the underlying revenue trend and performance of our core utility business.Total Retail Margin Revenues represents the portion of retail operating revenues available to cover the non-fuel operating expenses of our core utility business.Revenues.

K-43


2013Retail Revenues were higher in 2015 compared with 20122014 primarily due to the increase in the PPFAC rate and higher Retail Margin Revenues. Retail Margin Revenues were higher primarily due to higher LFCR revenues, DSM Performance Bonus, and Other Retail Margin Revenues related to adjustor mechanisms.
Residential
Residential kWh salesRetail Revenues were1.2% higher in 2013 due in part to favorable weather conditions2014 compared with 2012. A2013 primarily due to higher Retail Margin Revenues and increased LFCR revenues. The increase in Retail Margin Revenues resulted from a non-fuel base rateBase Rate increase effective July 1, 2013 and higher2013. These increases were partially offset by lower sales volumes led to an increase in residential margin revenues of 9.3%, or $23 million. The average number of residential customers grew by 0.7% in 2013 compared with 2012.
Commercial
Commercial kWh sales were the same when compared with 2012. A non-fuel base rate increase effective July 1, 2013 contributed to an increase in commercial margin revenues of 5.9%, or $10 million.
Industrial
Industrial kWh sales decreased by 0.9% compared with 2012. Lower salesvolume due to certain customers changing their usage patterns were more than offset by a non-fuel base rate increase effective July 1, 2013, which led to an increase in industrial margin revenues of $4 million.milder weather.
Mining
Mining kWh sales decreased by 1.2% compared with 2012. One of TEP's mining customers performed maintenance on its facilities resulting in a temporary decrease in production. A non-fuel base rate increase effective July 1, 2013 led to an increase in margin revenues from mining customers of 11.5%, or $4 million. See Factors Affecting Results of Operations, Sales to Mining Customers.
2012 compared with 2011
Residential
In 2012, residential kWh sales decreased by 1.7% compared with 2011 due in part to a decrease in the number of Cooling Degree Days during the summer months of 2012 compared with 2011. Other factors affecting TEP’s 2012 retail sales volumes included the ACC’s Electric EE Standards and distributed generation requirements, as well as the pace of economic recovery.
Residential margin revenues in 2012 decreased by $4 million when compared with 2011.
Commercial
Commercial kWh sales increased by 0.1% compared with 2011 due primarily to a 0.4% increase in the number of commercial customers. Commercial margin revenues increased by less than $1 million, or 0.1%, compared with 2011.
Industrial
Industrial kWh sales decreased by 0.6% in 2012 compared with 2011, while margin revenues declined by 2.5%. The decline in margin revenues resulted from a change in usage patterns by certain industrial customers that reduced their demand charges paid to TEP.
Mining
The continuation of high copper prices led to increased mining activity, resulting in a 0.9% increase in sales volumes in 2012 compared with 2011. However, margin revenues from mining customers decreased by 3.8% compared with 2011, due to changing usage patterns which resulted in lower demand charges paid to TEP.

K-44


Wholesale Sales and Transmission Revenues
 2013 2012 2011
 Millions of Dollars
Long-Term Wholesale Revenues:     
Long-Term Wholesale Margin Revenues (Non-GAAP)(1)
$7
 $5
 $13
Fuel and Purchased Power Expense Allocated to Long- Term Wholesale Revenues19
 20
 28
Total Long-Term Wholesale Revenues26
 25
 41
Transmission Revenues15
 16
 16
Short-Term Wholesale Revenues92
 70
 73
Electric Wholesale Sales (GAAP)$133
 $111
 $130
 Year Ended December 31,
(in millions)2015 2014 2013
Long-Term Wholesale Revenues$36

$28
 $26
Transmission Revenues27
 16
 15
Short-Term Wholesale Revenues104
 114
 92
Total Electric Wholesale Sales$167
 $158
 $133
(1)
Long-term Wholesale Margin Revenues, a non-GAAP financial measure, should not be considered as an alternative to Electric Wholesale Sales, which is determined in accordance with GAAP. We believe the change in Long-Term Wholesale Margin Revenues between periods provides useful information to investors because it demonstrates the underlying profitability of TEP’s long-term wholesale sales contracts. Long-Term Wholesale Margin Revenues represents the portion of long-term wholesale revenues available to cover the operating expenses of our core utility business.
Long-Term Wholesale Margin Revenues increased by $8 million, or 29%, in 2013 were higher when2015 compared with 20122014 primarily due to new wholesale agreements partially offset by unfavorable wholesale market prices. Transmission Revenues increased by $11 million, or 69%, in part2015 compared with 2014 primarily due to highera new long-term transmission agreement with UNS Electric related to Gila River and contract renewals resulting in favorable pricing.
Long-Term Wholesale Revenues increased by $2 million, or 8%, in 2014 compared with 2013 primarily due to favorable market prices for wholesale power. Long-Term Wholesale Margin RevenuesThere were no significant changes in 2012 were lower whentransmission revenues in 2014 compared with 2011 due to a change in the pricing2013.
The majority of energy sold under the SRP contract. See Factors Affecting Results of Operations, Long-Term Wholesale Sales, below.
Short-Term Wholesale Revenues
All revenues from short-term wholesale sales are related to ACC jurisdictional assets and 10% of the profits from wholesale trading activity are credited against the fuel and purchased power costs eligible for recovery in the PPFAC.
Other Revenues
2013 2012 2011Year Ended December 31,
Millions of Dollars
Revenue related to Springerville Units 3 and 4(1)
$102
 $101
 $97
(in millions)2015 2014 2013
Springerville Units 3 and 4 Revenue (1)
$91
 $112
 $102
Other Revenue28
 33
 2627
 29
 28
Total Other Revenue$130
 $134
 $123
$118
 $141
 $130
(1)
Represents revenues and reimbursements from Tri-State, the lessee of Springerville Unit 3, and SRP, ownersthe owner of Springerville Units 3 andUnit 4, respectively, to TEP related to the operation of these plants.
In addition to reimbursements related to Springerville Units 3 and 4, TEP’s other revenues include inter-company revenues from its affiliates, UNS Gas, Inc., an indirect wholly-owned subsidiary of UNS Energy, (UNS Gas) and UNS Electric, for corporate services provided by TEP, and miscellaneous service-related revenues such as rent on power pole attachments, damage claims, and customer late fees. See Note 5 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding related party transactions.
There were no significant changes in Other Revenue in 2015 compared with 2014, as well as no significant changes in Other Revenue in 2014 compared with 2013.

K-4522


Operating Expenses
Generating Output and Fuel and Purchased Power Expense
TEP’s fuel and purchased power expense and energy resources for 2013, 20122015, 2014, and 20112013 are detailed below:
 
Generation and Purchased
Power
 
Fuel and Purchased Power
Expense
 2013 2012 2011 2013 2012 2011
 Millions of kWh Millions of Dollars
Coal-Fired Generation10,254
 9,702
 9,946
 $273
 $247
 $254
Gas-Fired Generation1,007
 1,435
 929
 46
 65
 55
Renewable Generation38
 45
 28
 
 
 
Reimbursed Fuel Expense for Springerville Units 3 and 4
 
 
 7
 7
 8
Total Fuel11,299
 11,182
 10,903
 326
 319
 317
Total Purchased Power2,329
 2,328
 2,687
 112
 80
 106
Transmission and Other PPFAC Recoverable Costs
 
 
 12
 6
 (1)
Increase (Decrease) to Reflect PPFAC Recovery Treatment
 
 
 (12) 31
 (6)
Total Resources13,628
 13,510
 13,590
 $438
 $436
 $416
Less Line Losses and Company Use(885) (839) (786)      
Total Energy Sold12,743
 12,671
 12,804
      
Generation
Total generating output increased in 2013 when compared with 2012 due in part to higher retail kWh sales than the same period last year. Coal-fired generation increased by 6% in 2013 when compared with 2012 due in part to the use of coal to fuel Sundt Unit 4 instead of natural gas.
The table below summarizes TEP’s average cost per kWh generated or purchased:
 2013 2012 2011
 cents per kWh
Coal2.66
 2.54
 2.56
Gas4.57
 4.54
 5.99
Purchased Power4.83
 3.44
 3.94
All Sources3.54
 3.19
 3.30
O&M
The table below summarizes the items included in TEP’s O&M expense.
 2013 2012 2011
 Millions of Dollars
Base O&M (Non-GAAP)(1)
$246
 $234
 $238
O&M Recorded in Other Expense(7) (6) (8)
Reimbursed Expenses Related to Springerville Units 3 and 470
 72
 63
Expenses Related to Customer Funded Renewable Energy and DSM Programs(2)
26
 35
 38
Total O&M (GAAP)$335
 $335
 $331
 Generation and Purchased Power (kWh) Fuel and Purchased Power Expense
(in millions)2015 2014 2013 2015 2014 2013
Coal-Fired Generation8,584
 9,271
 10,254
 $209
 $232
 $273
Gas-Fired Generation2,723
 1,210
 1,007
 91
 60
 46
Utility Owned Renewable Generation65
 48
 38
 
 
 
Reimbursed Fuel Expense for Springerville Units 3 and 4 (1)

 
 
 5
 5
 7
Total Generation11,372
 10,529
 11,299
 305
 297
 326
Total Purchased Power3,079
 3,195
 2,329
 125
 153
 112
Transmission and Other PPFAC Recoverable Costs
 
 
 25
 18
 12
Increase (Decrease) to Reflect PPFAC Recovery Treatment
 
 
 40
 (11) (12)
Total Generation and Purchased Power14,451
 13,724
 13,628
 $495
 $457
 $438
Less Line Losses and Company Use(719) (859) (885)      
Total Energy Sold13,732
 12,865
 12,743
      
(1) 
Base O&MSpringerville Unit 3 and 4 Fuel Expense is a non-GAAP financial measurereimbursed by Tri-State and should not be considered as an alternative to O&M, which is determined in accordance with GAAP. TEP believes that Base O&M, which is O&M less reimbursed expenses and expensesSRP.
Fuel and Purchased Power Expense increased by $38 million, or 8%, in 2015 compared with 2014 primarily due to an increase in the PPFAC charge and additional generation and transmission costs associated with Gila River Unit 3. The increase was partially offset by favorable purchased power costs (see table below) and decreased coal generation at Springerville Unit 1 as a result of the lease expiration in January 2015.
Fuel and Purchased Power Expense increased by $19 million, or 4%, in 2014 compared with 2013 primarily due to the increase in purchased power volumes resulting from outages at Springerville and Sundt generating stations in 2014. The increase was partially offset by a decrease in generation expense as a result of the outages.
See the table below for information on the average fuel cost of generated and purchased kWh:
(cents per kWh)2015 2014 2013
Coal2.44
 2.50
 2.66
Gas3.35
 4.99
 4.57
Purchased Power4.05
 4.79
 4.83
All Sources3.31
 3.64
 3.54
Operations and Maintenance Expense
The table below summarizes the items included in Operations and Maintenance (O&M) expense:
(in millions)2015 2014 2013
Reimbursed Expenses - Springerville Units 3 and 4 (1)
$65
 $84
 $70
Reimbursed Expenses - Customer Funded Renewable Energy and
DSM Programs (2)
25
 23
 26
Other Operating and Maintenance Expense (3)
255
 272
 239
Total Operations and Maintenance Expense$345
 $379
 $335
(1)
Expenses related to customer-funded renewable energySpringerville Units 3 and DSM programs, provides useful information to investors because it represents the fundamental level of operating and maintenance expense related to our core business.4 are reimbursed with corresponding amounts recorded in other revenue.
(2) 
Represents expenses related to customer-funded renewable energy and DSM programs; theseThese expenses are being collected from customers and the corresponding amounts are recorded in retail revenue.
(3)
The Third-Party Owners' share of expenses related to Springerville Unit 1 is included in Other Operating and Maintenance Expense.

K-4623


The table below summarizes TEP’s pensionOperating and other retiree benefitMaintenance expenses includeddecreased by $34 million, or 9%, in TEP's Base2015 compared with 2014. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, decreased primarily due to outages incurred in 2014. Other Operating and Maintenance Expense decreased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014, partially offset by higher O&M related to Gila River, labor costs and outside services.
Operating and Maintenance expenses increased by$44 million, or 13%, in 2014 compared with 2013. Springerville Units 3 and 4 expenses, which are reimbursed by third party owners, increased primarily due to outages incurred in 2013, 2012,2014. Other Operating and 2011. See Maintenance Expense increased primarily due to acquisition related costs and outages at Springerville Units 1 and 2 that occurred in 2014.Note 10.
 2013 2012 2011
 Millions of Dollars
Pension Expense Charged to O&M$10
 $10
 $10
Retiree Benefit Expense Charged to O&M5
 5
 4
Total$15
 $15
 $14

FACTORS AFFECTING RESULTS OF OPERATIONS
2013 TEP2015 Rate OrderCase
In June 2013,November 2015, TEP filed a general rate case with the ACC issuedto: (i) update and improve its rate design and tariffs to provide more accurate price signals and a more equitable allocation of its fixed costs to its customers; (ii) provide TEP with an order (2013opportunity to recover its full cost of service, including an appropriate return on its rate base investments; and (iii) enable TEP Rate Order) that resolved theto continue to provide safe and reliable service. The rate case filed by TEP in July 2012, which wasapplication is based on a test year ended December 31, 2011.June 30, 2015. The 2013 TEP Rate Order approvedfiling requests that new rates effective Julybe implemented by January 1, 2013.2017.
The key provisions of the 2013 TEPrate case include:
a Base Rate Order include, but are not limited to:
an increase in non-fuel retail Base Rates of approximately $76$110 million, overor 12%, compared with adjusted test year revenues;
an Original Cost Rate Base (OCRB)a 7.34% return on original cost rate base of $2.1 billion;
a capital structure for rate making purposes of approximately $1.5 billion50% common equity and a Fair Value Rate Base (FVRB) of approximately $2.3 billion;50% long-term debt;
a return oncost of equity of 10.0%, a long-term10.35% and an average cost of debt of 5.18%,4.32%;
a request to apply excess depreciation reserves against the unrecovered net book value (NBV) of San Juan Unit 2 and the Sundt Coal Handling Facilities due to early retirement;
a request for authority to begin using the Third-Party Owners' portion of Springerville Unit 1 that is available to TEP for dispatch to serve retail customer needs and to recover the related operating costs through the PPFAC; and
rate design changes that would reduce the reliance on volumetric sales to recover fixed costs, and a short-term costnew net metering tariff that would ensure that customers who install distributed generation pay an equitable price for their electric service.
TEP cannot predict the outcome of debt of 1.42%, resulting in a weighted average cost of capital of 7.26%;
a capital structure of approximately 43.5% equity, 56.0% long-term debt, and 0.5% short-term debt;
a 0.68% return on the fair value increment ofthis proceeding or whether its rate base (the fair value increment of rate base represents the difference between OCRB and FVRB of approximately $800 million);
a revision in depreciation rates from an average rate of 3.32% to 3.0% for generation and distribution plant regulatedrequest will be adopted by the ACC primarily due to revised estimates of asset removal costs, which will have the effect of reducing depreciation expense by approximately $11 million annually; and
in whole or in part.
an agreement by TEP to seek recovery of costs related to the Nogales transmission line from the Federal Energy Regulatory Commission (FERC) before seeking rate recovery from the ACC.
The 2013 TEP Rate Order also approved the following cost recovery mechanisms:
A Lost Fixed Cost Recovery mechanism (LFCR) that allows TEP to recover certain non-fuel costs that would otherwise go unrecovered due to reduced kWh sales attributed to energy efficiency programs and distributed generation. The LFCR rate will be adjusted annually and is subject to ACC review and a year-over-year cap of 1% of TEP's total retail revenues. TEP expects to file its first LFCR report with the ACC on or before May 15, 2014. We expect the new LFCR rate to become effective on July 1, 2014. TEP’s 2015 LFCR report may include an estimated $6 million to $8 million of unrecovered non-fuel costs incurred during 2014. In the fourth quarter of 2013, TEP recorded LFCR revenues of $2 million for unrecovered non-fuel costs incurred during 2013.
An Environmental Compliance Adjustor (ECA) mechanism that allows TEP to recover the costs of complying with environmental standards required by federal or other governmental agencies between rate cases. The ECA will be adjusted annually to recover environmental compliance costs and is subject to ACC approval and a cap of $0.00025 per kWh, which approximates 0.25% of TEP's total retail revenues. TEP expects to file its first ECA report on or before March 1, 2014. That report will include qualified investments and costs to be included in the ECA. TEP expects the new ECA rate to become effective on May 1, 2014. We estimate that the ECA could benefit pre-tax income by less than $1 million in 2014.
An energy efficiency provision which includes a 2013 calendar year budget to fund programs that support the ACC's Electric Energy Efficiency Standards (Electric EE Standards), as well as a performance incentive. See Electric Energy Efficiency Standards, below.
A new rate under TEP's PPFAC. See Purchased Power and Fuel Adjustment Clause, below.

K-47


Competition
Retail Electric Competition Rules
In 1999, the ACC approved the Rules that provided a framework for the introduction of retail electric competition in Arizona.  Certain portions of the ACC Rules that enabled Electric Service Providers (ESPs) to compete in the retail market were invalidated by an Arizona Court of Appeals decision in 2004.  During 2012, several companies filed applications for a Certificate of Convenience and Necessity (CC&N) with the ACC to provide competitive retail electric services in TEP's service territory as an ESP.  Unless and until the ACC clarifies the Rules and/or grants a CC&N to an ESP, it is not possible for TEP's retail customers to use an alternative ESP.
In May 2013, the ACC voted to commence a process to consider the possibility of opening Arizona to retail electric competition. The first step in the process was to solicit comments on questions raised by the ACC on the potential benefits and risks to Arizona electric customers associated with retail electric competition. In July 2013, various parties, including TEP and UNS Electric, filed comments. TEP and UNS Electric oppose opening Arizona to retail electric competition. Responsive comments from the parties were filed in August 2013. In September 2013, the ACC voted to close the docket and did not take any steps to implement retail electric competition. We cannot predict if the ACC will consider retail electric competition in the future.
Technological Developments and Energy Efficiency
New technological developments and the implementation of Electric EE Standards have reduced energy consumption by TEP's retail customers. TEP's customers also have the ability to install renewable energy technologies and conventional generation units that could reduce their reliance on TEP's services.
Coal-Fired Generating Resources
At December 31, 2013,2015, approximately 70%49% of TEP's generating capacity was fueled by coal (of which 120 MW can be converted to 156 MW of natural gas capacity at Sundt Unit 4).coal. Existing and proposed federal environmental regulations, as well as potential changes in state regulation, may increase the cost of operating coal-fired generating facilities. TEP is executing strategies and evaluating various strategies for reducingadditional steps to reduce its dependency on coal generation.
In August 2015, TEP exhausted its existing coal supply at Unit 4 of the proportion of coal in itsH. Wilson Sundt Generating Station (Sundt Unit 4). Currently, TEP is operating Sundt Unit 4 on natural gas as a primary fuel mix. source.
TEP's ability to further reduce its coal-fired generating capacity will depend on several factors, including, but not limited to:
The impact of the Clean Power Plan on current coal-fired generating facilities; and
the resolution of the non-binding agreement between the State of New Mexico, the EPA, and PNM as it relatesThe ability to San Juan, see Note 7;
TEP's future ownership interest inresolve Springerville Unit 1 see Springerville Unit 1; and
legal proceedings relating to the potential purchase of a combined cycle natural gas plant, see Gila River Generating Station Unit 3Third-Party Owners.
See Part I, Item 1. Business, General for additional information regarding TEP's generating facilities.

24



Springerville Unit 1
TEP leasesleased Unit 1 of the Springerville Generating Station and an undivided one-half interest in certain Springerville Common Facilities (collectively Springerville Unit 1) under seven separate lease agreements (Springerville Unit 1 Leases) that arewere accounted for as capital leases. The leases expireexpired in January 2015 and include fair market value renewal and purchase options. In 2006,2015. At that time, TEP purchased a 14.1% undivided ownershipleased interest in Springerville Unit 1, representing approximately 55 MW of capacity.
In 2011, TEP and the owner participants of Springerville Unit 1 completed a formal appraisal procedure to determine the fair market value purchase price of Springerville Unit 1 in accordance with the Springerville Unit 1 Leases. The purchase price was determined to be $478 per kW of capacity based on a capacity rating of 387 MW.
In August 2013, TEP notified certain owner participants and their lessors that TEP elected to purchase their undivided ownership interests in Springerville Unit 1, at the appraised value upon the expiration of the lease term in January 2015. In total, TEP elected to purchase leased interests comprising 24.8% of Springerville Unit 1, representing 96 MW of capacity, for an aggregate purchase price of $46 million.
In October 2013, Following this purchase, TEP agreed to purchase an additional 10.6% leased interest in Springerville Unit 1 for $20 million, the appraised value, with the purchase scheduled to occur in December 2014. The 10.6% ownership interest represents 41 MW of capacity.

K-48


Upon the close of these lease option purchases, TEP will ownowns 49.5% of Springerville Unit 1, or 192 MW of capacity. Due to TEP’s purchase commitments, TEP and UNS Energy recorded an increase to both Utility Plant Under Capital Leases and Capital Lease Obligations on their balance sheets in the aggregate amount of approximately $55 million.
TEP does not expect that its final undivided ownership interest in Springerville Unit 1 will exceed 49.5%, or 192 MW of capacity. The remaining 50.5% of Springerville Unit 1, or 195 MW of capacity, will beis owned by third parties.Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-trustee under a separate trust agreement with each of the remaining two owner participants, Alterna Springerville LLC (Alterna) and LDVF1 TEP LLC (LDVF1) (Alterna and LDVF1, together with the Owner Trustees and Co-trustees, the Third-Party Owners). TEP is not obligated to purchase any of the remaining power from Springerville Unit 1; however,Third-Party Owners’ generating output. TEP is obligated to operate the unit for the Third-Party Owners. Owner Trustees and Co-Trustees are obligated to compensate TEP for their pro rata share of expenses for the unit. TEP estimates the Third-Party Owners’ share of 2016 operations and maintenance expense will be $27 million and their estimated share of 2016 capital expenditures will be $9 million.
In April 2015, TEP filed a demand for arbitration seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expense and capital expenditures for Springerville Unit 1. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the remaining third-party owners followingThird-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and Part I, Item 3. Legal Proceedings for additional information regarding the legal proceedings relating to the Third-Party Owners.
Potential Plant Retirements
TEP's 2014 Integrated Resource Plan (IRP), which was acknowledged by the ACC in April 2015, reflected plans to reduce its overall coal capacity by 492 MW (32% of TEP's existing coal fleet) by 2018. TEP's 2014 IRP included retiring certain coal-fired generating facilities at San Juan Generating Station (San Juan) and coal handling facilities at the H. Wilson Sundt Generating Station (Sundt) earlier than their current estimated useful lives. These facilities currently do not have the requisite emission control equipment to meet proposed Environmental Protection Agency (EPA) regulations. TEP plans to seek regulatory recovery for amounts that would not otherwise be recovered if and when any assets are retired. TEP plans to file a preliminary IRP in March 2016 and is required to file its next IRP by April 2017.
See Part I, Item 1. Business, Environmental Matters for additional information regarding the impact of environmental matters on plant operations.
Springerville Coal Handling Facilities Capital Lease Purchase
TEP previously leased interests in the coal handling facilities at the Springerville Generating Station (Springerville Coal Handling Facilities) under two separate lease agreements (Springerville Coal Handling Facilities Leases). The lease agreements had an initial term that expired in April 2015 and provided TEP the option to renew the leases or to purchase the leased interests at the aggregate fixed price of $120 million. In April 2015, TEP exercised its option to purchase the facilities.
Upon the expiration of the leases.lease term, TEP expectspurchased an 86.7% undivided ownership interest in the Springerville Coal Handling Facilities bringing TEP's total ownership interest to replace100%. With the 195 MWcompletion of expiring leased capacity with the purchase, of Gila River Unit 3. See Gila River Generating Station Unit 3, below.
Gila River Generating Station Unit 3
In December 2013, TEP and UNS Electric entered into an agreement (the Purchase Agreement)SRP was obligated to purchase Gila River Unit 3 for $219 million frombuy a subsidiary of Entegra. The purchase price is subject to adjustments to prorate certain fees and expenses through the closing and in respect of certain operational matters. It is anticipated that TEP will purchase a 75%17.05% undivided interest in Gila River Unit 3 (413 MW)the Springerville Coal Handling Facilities from TEP for approximately $164 million and UNS Electric will purchase the remaining 25%$24 million. This transaction was completed in May 2015. Tri-State, is obligated to either: 1) buy a 17.05% undivided interest (137 MW)in the facilities for approximately $55$24 million althoughor 2) continue to make payments to TEP and UNS Electric may modifyfor the percentage ownership allocation between them. We expect the transaction to close in December 2014.
The Purchase Agreement is subject to, among other things:
the expiration or terminationuse of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended;
the approval of the FERC;
an amendment satisfactoryfacilities. Tri-State has until April 2016 to TEP, UNS Electric and the owners of the other units of the Gila River Power Station of the agreement with the other unit owners to address the ownership, operations and maintenance of common facilities and future generation located at the station;
the completion of certain other agreements associated with the operation of Gila River Unit 3; and
other customary closing conditions.
TEP expects to provide a letter of credit in March 2014 for $15 million to satisfy a condition of the Purchase Agreement. The seller of Gila River Unit 3 would be entitled to draw upon the letter of credit and apply such amount as liquidated damages if it has validly terminated the Purchase Agreement as a result of misrepresentations by TEP and UNS Electric or the failure of TEP and UNS Electric to close the transaction when the closing conditions have been satisfied. Upon the close of the transaction, the letter of credit would be canceled.
Theexercise its purchase of Gila River Unit 3, which would replace the expiring coal-fired leased capacity from Springerville Unit 1 and the expected reduction of coal-fired generating capacity from San Juan Unit 2, is consistent with TEP's strategy to diversify its generation fuel mix. See Note 7.option.
In December 2013, UNS Electric filed an application requesting the ACC to approve an accounting order that would authorize UNS Electric to defer for future recovery specific non-fuel operating costs associated with its anticipated ownership of 25% of Gila River Unit 3. See UNS Electric, Factors Affecting Results of Operations, Gila River Generating Station Unit 3 and Note 8.
Springerville Units 3 and 4
TEP receives annual benefits in the form of rental payments and other fees and cost savings from operating Springerville Unit 3 on behalf of Tri-State and Unit 4 on behalf of SRP.

K-49


The table below summarizes the income statement line items in which TEP records revenues and expenses related to Springerville Units 3 and 4:
 2013 2012 2011
 Millions of Dollars
Other Revenues$102
 $101
 $97
Fuel Expense(7) (7) (8)
O&M Expense(69) (72) (63)
Taxes Other Than Income Taxes(2) (1) (2)
Long-Term Wholesale Sales
TEP’s two primary long-term wholesale contracts are with SRP and the Navajo Tribal Utility Authority (NTUA).
Salt River Project
From January 1, 2012, through the end of the contract in May 2016, SRP is required to purchase 500,000 MWh of on-peak energy per year. TEP does not receive a demand charge and the price of energy is based on a discount to the wholesale market price of on-peak power.
Navajo Tribal Utility Authority
TEP serves the portion of NTUA's load that is not served from NTUA's allocation of federal hydroelectric power. Over the last three years, sales to NTUA averaged 225,000 MWh. Prior to June 30, 2013, the power sold to NTUA was at a fixed price.  In May 2013, TEP amended its contract with NTUA and extended the contract term from December 2015 to December 2022.
As a result of the amendment, on July 1, 2013, TEP began receiving monthly capacity payments in exchange for providing 15 MW from July to September (June to September beginning in 2014 and thereafter) and 50 MW for the remainder of each year. Starting in 2016, the July to September capacity increases to 25 MW. TEP prices the energy sold to NTUA at its monthly PPFAC eligible cost rate. Any energy sold in excess of the seasonal capacity amounts will be indexed to the wholesale market price of natural gas.  TEP estimates that sales to NTUA will be approximately 225,000 MWh in 2014 and 2015.
Sales to Mining Customers
TEP's largest mining customers have indicated they arecustomer is taking initial steps to increasecurtail production either through expansion of their current mining operations or by the re-opening of non-operational mine sites. If efforts to increase production are successful, TEP's mining load could increase by up to 100 MW over the next several years. The market price for copper and the ability to obtain necessary permits could affect the mining industry's expansion plans.
In additionin 2016 due to the decline in commodity prices. TEP cannot predict the extent to which this customer will curtail production, how long commodity prices will remain low, or the

25



total impact the prices will have on mining production in the future. At December 31, 2015, mining customers that TEP currently serves, Augusta Resources Corporation filed a planmade up 8% of operations with the United States Forest Service in 2007 for theTEP's total electric sales.
The proposed Rosemont Copper Mine near Tucson, Arizona.  The Rosemont Copper Mine requires electric service from TEP via a 138 kilo-volt (kV) transmission line forArizona is in the construction and ongoing operation of the mine. The state line siting committee approved a Certificate of Environmental Compatibility (CEC) in 2011 for the 138 kV transmission line. In 2012, the ACC finalized the CEC.permitting stage. If the Rosemont Copper Mine is constructed and reaches full production, it would be expected towill become TEP's largest retail customer with TEP serving the mine'san estimated load of approximately 85 to 120 MW.
TEP cannot predict if or when existing mines will expand operations or new or re-opened mines will commence operations.
Interest Rates
TEP is exposed to interest rate risk resulting from changes in interest rates on certain of its variable rate debt obligations, as well as borrowings under its revolving credit facility. As a result, TEP may be required to pay significantly higher rates of interest on outstanding variable rate debt and borrowings under the TEP Revolving Credit Facility. At December 31, 2013, TEP had $215 million in tax-exempt variable rate debt outstanding. The interest rates on TEP’s tax-exempt variable rate debt are reset weekly or monthly. In 2013, the average rates paid ranged from 0.06% to 0.48%.
TEP has a fixed-for-floating interest rate swap to hedge $50 million of its tax-exempt variable rate debt.
TEP is also subject to interest rate risk resulting from changes in interest rates on its borrowings under the TEP Revolving Credit Facility. The interest paid on revolving credit borrowings is variable. If LIBOR and other benchmark interest rates

K-50


increase, TEP may be required to pay higher rates of interest on borrowings under its revolving credit facility. See Part II, Item 7A. Quantitative and Qualitative Disclosures about Market Risk.for information regarding interest rate risks and its impact on earnings.

LIQUIDITY AND CAPITAL RESOURCES
TEP Cash Flows
The tables below show TEP's net cash flows after capital expenditures, scheduled lease debt payments, and payments on capital lease obligations:
 2013 2012 2011
 Millions of Dollars
Net Cash Flows – Operating Activities (GAAP)$346
 $268
 $268
Less: Capital Expenditures(253) (253) (352)
Net Cash Flows after Capital Expenditures (Non-GAAP)(1)
93
 15
 (84)
Less: Payments of Capital Lease Obligations(100) (89) (74)
Plus: Proceeds from Investment in Lease Debt9
 19
 38
Net Cash Flows after Capital Expenditures and Required Payments on Lease Debt and Capital Lease Obligations (Non-GAAP)(1)
$2
 $(55) $(120)
 2013 2012 2011
 Millions of Dollars
Net Cash Flows – Operating Activities (GAAP)$346
 $268
 $268
Net Cash Flows – Investing Activities (GAAP)(260) (228) (312)
Net Cash Flows – Financing Activities (GAAP)(141) 12
 52
Net Increase (Decrease) in Cash(55) 52
 8
Beginning Cash80
 28
 20
Ending Cash$25
 $80
 $28
(1)
Net Cash Flows after Capital Expenditures and Net Cash Flows after Capital Expenditures and Required Payments on Lease Debt and Capital Lease Obligations, both non-GAAP measures of liquidity, should not be considered as alternatives to Net Cash Flows—Operating Activities, which is determined in accordance with GAAP. We believe that Net Cash Flows after Capital Expenditures and Net Cash Flows after Capital Expenditures and Required Payments on Lease Debt and Capital Lease Obligations provide useful information to investors as measures of TEP’s ability to fund capital requirements, make required payments on lease debt and capital lease obligations, and pay dividends to UNS Energy before consideration of financing activities.
Liquidity Outlook
Cash flows may vary during the year, with cash flowflows from operations typically the lowest in the first quarter and highest in the third quarter due to TEP’s summer peaking load. As a result of the varied seasonal cash flow, TEPwe will use, as needed, itsour revolving credit facility to assist in funding its business activities. We believe that we have sufficient liquidity under our revolving credit facilities to meet short-term working capital needs and to provide credit enhancement as necessary under energy procurement and hedging agreements.
Additionally, dueAvailable Liquidity
(in millions)As of December 31, 2015
Cash and Cash Equivalents$56
Amount Available under Revolving Credit Facility (1)
250
Total Liquidity$306
(1)
TEP's revolving credit facility, which matures in 2020, provides for a $250 million revolving credit commitment with a LOC sublimit of $50 million.
Future Liquidity Requirements
We expect to meet all of our financial obligations and other anticipated cash outflows for the foreseeable future. These obligations and anticipated cash outflows include, but are not limited to, dividend payments, debt maturities, and obligations included in the Contractual Obligations and forecasted Capital Expenditures tablesbelow.
See Part III, Item 7A. Quantitative and Qualitative Disclosures about Market Risk for additional information regarding TEP's market risks and Note 6of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's financing arrangements.
Summary of Cash Flow
The table below presents net cash provided by (used for) operating, investing and financing activities:
 Year Ended 
Increase
(Decrease)
 Year Ended 
Increase
(Decrease)
(in millions)2015 2014 Percent 2013 Percent
Operating Activities$365
 $314
 16.2 % $346
 (9.2)%
Investing Activities(503) (518) (2.9)% (260) 99.2 %
Financing Activities120
 253
 (52.6)% (141) 279.4 %
Net Increase (Decrease) in Cash(18) 49
 (136.7)% (55) 189.1 %
Cash, Beginning of Year74
 25
 196.0 % 80
 (68.8)%
Cash, End of Year$56
 $74
 (24.3)% $25
 196.0 %
Cash Flows for both 2015 and 2014 included unusually large capital expenditureexpenditures. These capital requirements were met with a combination of equity contributions from UNS Energy and scheduled mid-year lease payments, TEP will need to issuelong-term borrowings as discussed in Financing Activities below.

26



In 2015, we issued long-term debt or enter into additional short-termand used the proceeds to repay revolving and term loans under our credit agreements and pay a portion of the purchase price for interests in the Springerville Coal Handling Facilities. In addition, we received an equity contribution from UNS Energy and used the proceeds to repay the outstanding balances under our revolving credit facilities byand redeem long-term variable rate tax-exempt bonds which were called for redemption in June 2014. Due2015.
In 2014, we received an equity contribution from UNS Energy and used the proceeds to additionalpay for the purchase commitments forof both Gila River Unit 3 and Springerville Unit 1 additional external financing will be needed by year-end 2014.leased assets.
If the Merger Agreement is approved by all necessary parties, Fortis will contribute $200 million of equity capital to UNS Energy upon closing. If the contribution is made by December 2014, UNS Energy may then contribute this capital to TEP and UNS Electric to help fund the Gila River Unit 3 and Springerville Unit 1 purchase commitments.
Operating Activities
2015 compared with 2014
In 2013,2015, net cash flows from operating activities were $78increased by $51 million higher than in 2012. The increase was compared to 2014 primarily due primarily to: a $34
$39 million increase inof higher cash receipts from retail and wholesale sales, net of fuel and purchased power costs paid resulting from a base rate increase that became effective on July 1, 2013,driven primarily by an increase in retail sales volumes,the average PPFAC rate; and an
$34 million in lower cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition.
The increase in wholesale power prices; a $30 million decrease in operations and maintenance costs paid due in part to lower renewable prepayments, lower incentive payments under DSM programs, and lower payments for remote plants; and a $6 million decrease in capital

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lease interest paid due to a decline in capital lease obligation balances;net cash flows from operating activities was partially offset by a $6$16 million increase in wagesof higher cash paid (netfor pension and retiree funding.
2014 compared with 2013
In 2014, net cash flows from operating activities decreased by $32 million compared to 2013 primarily due to:
$27 million of amounts capitalized).higher cash paid for acquisition-related costs and incentive compensation primarily due to the 2014 acquisition; and
$6 million of higher cash paid for capital lease interest.
Investing Activities
2015 compared with 2014
In 2015, net cash flows used for investing activities decreased by $15 million compared with 2014 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.
The decrease in net cash flows used for investing activities was partially offset by:
$120 million purchase, in April 2015, of an additional 86.7% undivided ownership interest in the Springerville Coal Handling Facilities partially offset by $24 million of cash received for the sale, in May 2015, of a 17.05% undivided ownership interest in the Springerville Coal Handling Facilities to SRP;
$46 million purchase, in January 2015, of an additional 24.8% undivided ownership interest in Springerville Unit 1 increasing our total ownership interest to 49.5%;
$11 million in lower cash receipts for contributions in aid of construction received; and
$10 million of higher capital expenditures to fund system reinforcement through replacements and betterments.
Net2014 compared with 2013
In 2014, net cash flows used for investing activities increased by $32$258 million compared with 2013 primarily due to:
$164 million purchase, in December 2014, of a 75% interest in Gila River Unit 3;
$71 million of higher capital expenditures to fund the construction of new solar projects and improvements to our generating facilities; and
$20 million purchase, in December 2014, of a 10.6% interest in Springerville Unit 1.

27



Financing Activities
2015 compared with 2014
In 2015, net cash flows from financing activities decreased by $133 million compared with 2014 primarily due to:
$209 million in 2013 compared with 2012 due primarily to: a $14 million increase in purchases of RECshigher cash payments due to an increasethe purchase of $130 million in renewable energy PPAs;fixed rate tax-exempt long-term debt in January 2015, and $10the retirement of $79 million in variable rate tax-exempt bonds in August 2015;
$170 million in lower proceeds borrowed and higher repayments under TEP's revolving credit facilities;
$45 million in lower cash proceeds from investmentUNS Energy's equity contributions; and
$10 million in lease debt.higher cash dividend payments.
TEP’s capital expenditures were $253 millionThe decrease in each of 2013 and 2012.
TEP's forecasted capital expenditures are summarized below:
 2014 2015 2016 2017 2018
 Millions of Dollars
Transmission and Distribution$135 $169 $84 $80 $81
Generation Facilities109
 101
 63
 83
 61
Renewable Energy Generation45
 30
 31
 31
 31
Springerville Lease Purchases(1)
20
 119
 
 38
 
Gila River Unit 3 Purchase164
 
 
 
 
General and Other55
 50
 45
 44
 45
Total$528 $469 $223 $276 $218
(1)
Includes: Springerville Unit 1 purchases of $65 million, $20 million in 2014, and $46 million in 2015; TEP's portion of the Springerville Coal Handling facilities purchase of $73 million in 2015; and Springerville Common facilities purchases of $38 million in 2017.
Financing Activities
In 2013, net cash flows from financing activities was partially offset by:
$153152 million in lower than 2012. Financing activities in 2013 included a $10 million increase in dividendcash payments due to UNS Energy and a $10 million increase in payments made onthe expiration of capital lease obligations. Financing activitiesobligations in 2012 included:2015; and
$150 million in higher cash proceeds from the issuance of $150long-term debt, in February 2015.
2014 compared with 2013
In 2014, net cash flows from financing activities increased by $394 million of long-term debt; $7 million of repayments of long-term debt; and $10 million of repayments (net of borrowings) under the TEP Revolving Credit Facility.compared with 2013 primarily due to:
TEP Mortgage Indenture
Prior to November 2013, the TEP Credit Agreement and the 2010 TEP Reimbursement Agreement were secured by $423$225 million in Mortgage Bonds issued underhigher cash proceeds from UNS Energy's equity contributions made to complete the 1992 Mortgage. As a result of a credit rating upgrade, in October 2013, TEP (i) requested $423 million in Mortgage Bonds be returned to TEPpurchases for cancellation, and (ii) discharged the 1992 Mortgage, which had created a lien on and security interest in substantially all of TEP’s utility plant assets. TEP’s obligations under the TEP Credit Agreement and the 2010 TEP Reimbursement Agreement are now unsecured. See Note 6.
TEP Credit Agreement
TEP Credit Agreement consists of a $200 million revolving credit, revolving LOC facility and an $82 million LOC facility to support tax-exempt bonds. The TEP Credit Agreement expires in November 2016.
In December 2013, TEP reduced its letter of credit facility from $186 million to $82 million, following the refinancing of $100 million of variable rate bonds and the cancellation of $104 million of LOCs supporting those bonds.
At December 31, 2013, there were no outstanding borrowings and $1 million of LOCs issued under the TEP Revolving Credit Facility.
In March 2014, TEP expects to issue a $15 million LOC to a subsidiary of Entegra to satisfy a condition of the Gila River Unit 3 purchase agreement.and Springerville Unit 1;
$149 million in higher cash proceeds from the issuance of long-term debt; and
$85 million in higher cash borrowings (net of repayments) under TEP's borrowing capacityrevolving credit facilities.
The increase in net cash flows from financing activities was partially offset by $66 million in higher cash payments of capital lease obligations.
External Sources of Liquidity
Short-Term Investments
TEP’s short-term investment policy governs the investment of excess cash balances. We regularly review and update this policy in response to market conditions. At December 31, 2015, TEP's short-term investments included highly-rated and liquid money market funds.
Access to Revolving Credit Facilities
We have access to working capital through a revolving credit agreement with lenders. The 2015 Credit Agreement provides for a $250 million revolving credit commitment and LOC facility, due in October 2020. The LOC sublimit is $50 million. TEP expects that amounts borrowed under the TEPcredit agreement will be used for working capital and other general corporate purposes and that LOCs will be issued from time to time to support energy procurement and hedging transactions. No amounts were drawn under the 2015 Credit Agreement will be reduced by $15 million untilat December 31, 2015.
In June 2015, the Gila River transaction closes and2014 Credit Agreement was terminated. In October 2015, the LOC is2010 Credit Agreement was terminated.
The TEP Credit Agreement contains restrictionsFor details on mergers and saleTEP's credit facilities see Note 6 of assets. The TEP Credit Agreement also requires TEP notNotes to exceed a maximum leverage ratio. If TEP complies with the termsConsolidated Financial Statements in Item 8 of the TEP Credit Agreement, TEP may pay dividends to UNS Energy. At December 31, 2013, TEP was in compliance with the terms of the TEP Credit Agreement. See Note 6.

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2010 TEP Reimbursement Agreement
In December 2010, TEP entered into a four-year $37 million reimbursement agreement (2010 TEP Reimbursement Agreement). A $37 million LOC was issued pursuant to the 2010 TEP Reimbursement Agreement. The LOC supports $37 million aggregate principal amount of variable rate tax-exempt pollution control bonds that were issued on behalf of TEP in December 2010.
In February 2014, TEP amended the 2010 TEP Reimbursement Agreement to extend the expiration date of the LOC from 2014 to 2019.
The 2010 TEP Reimbursement Agreement contains substantially the same restrictive covenants as the TEP Credit Agreement described above. At December 31, 2013, TEP was in compliance with the terms of the 2010 TEP Reimbursement Agreement. See Note 6this Form 10-K for additional information.
2013 Bond Issuances and RedemptionsDebt Financing
In March 2013, approximately $91 millionWe use debt financing to lower our overall cost of unsecured tax-exempt industrial development bonds were issuedcapital. We are exposed to adverse changes in interest rates to the extent that we rely on behalfvariable rate financing. Our cost of TEP. The bonds bear interest at a fixed rate of 4.0%, mature in September 2029 and may be redeemed at par on or after March 1, 2023. capital is also affected by our credit ratings
In April 2013,2015, we filed a financing application with the proceedsACC. The application requests extending and expanding the existing financing authority to TEP by: (i) extending authority from December 2016 to December 2020; (ii) increasing the outstanding long-term debt limitation from $1.7 billion to $2.2 billion; (iii) allowing parent equity contributions of the bond issuance were usedup to $400 million; and (iv) extending current interest rate hedging authority. The ACC issued an order granting such authority in January 2016.

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As discussed in Part I, Item 1A. Risk Factors of this Form 10-K, we may need to redeem approximately $91 million ofor defease certain tax-exempt bonds with an interest rateoutstanding. To the extent that is required, we would need to issue new taxable debt or enter into a new bank financing.
We have no new financing planned for 2016. TEP has, from time to time, refinanced or repurchased portions of 6.375% and a maturity dateits outstanding debt before scheduled maturity. Depending on market conditions, TEP may refinance other debt issuances or make additional debt repurchases in the future. For details on changes to or maturities on long-term debt, see Note 6 of September 2029. See Note 6Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
In November 2013, $100 million of unsecured tax-exempt industrial development revenue bonds were issued on behalf of TEP and sold in a private placement. The bonds bear interest at a variable rate, mature in April 2032, and may be redeemed at any time while the bonds are in variable rate mode and upon proper notice by TEP. Also in November 2013, TEP entered into a Lender Rate ModeDebt Restrictive Covenants Agreement (2013 Covenants Agreement), with the purchaser of the bonds. The 2013 Covenants Agreement contains covenants and events of default which are the same, in all material respects, as those in the TEP Credit Agreement, including restrictions on mergers and sale of assets and requiring TEP not to exceed a maximum leverage ratio.
Under the terms of the 2013 Covenants Agreement, TEP may pay dividends to UNS Energy so long as it maintains compliance with the agreement. In December 2013, the proceeds of the bond issuance were used to redeem $100 million of variable rate tax-exempt bonds with a maturity date of December 2018. See Note 6.
Capital Lease Obligations
At December 31, 2013, TEP had $317 million of total capital lease obligations on its balance sheet. The table below provides a summary of the outstanding lease obligations:
 
Capital Lease  Obligation
Balance As Of
    
Capital LeasesDecember 31, 2013 Expiration Renewal/Purchase Option
 Millions of Dollars    
Springerville Unit 1(1)
$193
 2015 
Fair market value(2)
Springerville Coal Handling Facilities28
 2015 
Fixed price purchase
option of $120 million(3)
Springerville Common Facilities(4)
96
 2017 and 2021 
Fixed price purchase
option of $106 million(3)
Total Capital Lease Obligations$317
    
(1)
The Springerville Unit 1 Leases cover both Unit 1 and an undivided one-half interest in certain Springerville Common Facilities. The $193 million balance includes the present value of the lease purchase options elected and agreed to in August and October 2013. See Factors Affecting Results of Operations, Coal-Fired Generating Resources, Springerville Unit 1. Also see Note 6.
(2)
As determined in December 2011 in an appraisal procedure undertaken pursuant to the Springerville Unit 1 lease agreements. TEP elected and agreed to purchase certain interests in the Springerville Unit 1 lease agreements in August and October 2013. See Factors Affecting Results of Operations, Coal-Fired Generating Resources, Springerville Unit 1. Also see Note 6.
(3)
TEP agreed with Tri-State, the lessee of Springerville Unit 3 and SRP, the owner of Springerville Unit 4, that if the Springerville Coal Handling Facilities and Common Leases are not renewed, TEP will exercise the purchase options under these contracts. SRP will then be obligated to buy a portion of these facilities and Tri State will then be obligated to either 1) buy a portion of these facilities; or 2) continue making payments to TEP for the use of these facilities.
(4)
The Springerville Common Facilities Leases cover an undivided one-half interest in certain Springerville Common Facilities.
TEP's capital lease obligation balances decline over time due to the normal capital lease payments made by TEP.

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Income Tax Position
See UNS Energy Consolidated, Liquidity and Capital Resources, Income Tax Position.
Contractual Obligations
The following chart displays TEP’s contractual obligations by maturity and by type of obligation as of December 31, 2013:
 TEP Contractual Obligations
Payment Due in Years Ending December 31,2014 2015 2016 2017 2018 Thereafter Other Total
 Millions of Dollars
Long-Term Debt               
Principal$
 $
 $78
 $
 $100
 $1,046
 $
 $1,224
Interest54
 53
 54
 53
 54
 443
 
 711
Capital Lease Obligations214
 69
 17
 18
 11
 30
 
 359
Operating Leases3
 3
 2
 2
 2
 14
 
 26
Purchase Obligations(1):
               
Fuel77
 63
 64
 62
 36
 285
 
 587
Purchased Power27
 5
 
 
 
 
 
 32
Transmission3
 6
 6
 6
 6
 21
 
 48
Renewable Power Purchase Agreements30
 31
 31
 31
 31
 410
   564
RES Performance-Based Incentives8
 8
 8
 8
 8
 83
 
 123
Acquisition of Springerville Coal Handling and Common Facilities
 120
 
 38
 
 68
 
 226
Other Long-Term Liabilities:               
Pension & Other Post Retirement Obligations15
 6
 6
 6
 6
 33
 
 72
Unrecognized Tax Benefits
 
 
 
 
 
 2
 2
Total Contractual Obligations$431
 $364
 $266
 $224
 $254
 $2,433
 $2
 $3,974
(1) Excludes the acquisition of Gila River Unit 3 pending regulatory approvals. See Note 8.
See UNS Energy Consolidated, Liquidity and Capital Resources, Contractual Obligations, for a description of these obligations.
We have reviewed our contractual obligations and provide the following additional information:
The TEP2015 Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement contain pricing based on TEP’s credit ratings. A change in TEP’s credit ratings can cause an increase or decrease in the amount of interest TEP pays on its borrowings, and the amount of fees it pays for its LOCs and unused commitments. A downgrade in TEP’s credit ratings would not cause a restriction in TEP’s abilityAlso, under certain agreements, should TEP fail to borrow under its revolving credit facility.
The TEP Credit Agreement, the 2010 Reimbursement Agreement, and the 2013 Covenants Agreement contain certain financial and other restrictivemaintain compliance with covenants, including a leverage test. Failure to comply with these covenants would entitle the lenders tocould accelerate the maturity of all amounts outstanding. At December 31, 2013,2015, TEP was in compliance with these covenants. See TEP Credit Agreement, above.
TEP conducts its wholesale marketing and risk management activities under certain master agreements whereby TEP may be required to post credit enhancements in the form of cash or ana LOC due to exposures exceeding unsecured credit limits provided to TEP, changes in contract values, a change in TEP’s credit ratings, or if there has been a material change in TEP’s creditworthiness. As of December 31, 2013,2015, TEP had posted less than $1 million in LOCs as collateral with counterparties for credit enhancement.enhancement with wholesale counterparties.

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TableWe do not have any provisions in any of Contentsour debt or lease agreements that would cause an event of default or cause amounts to become due and payable in the event of a credit rating downgrade.
Credit Ratings

Our credit ratings affect our access to capital markets and supplemental bank financing. At December 31, 2015, TEP’s credit ratings for senior unsecured debt were A3 from Moody’s and BBB+ from both Standard & Poor’s and Fitch. As of February 2016, at TEP's request for commercial reasons, Fitch withdrew its rating on TEP.
TEP's credit ratings are dependent on a number of factors, both quantitative and qualitative, and are subject to change at any time. The disclosure of these credit ratings is not a recommendation to buy, sell, or hold TEP securities. Each rating should be evaluated independently of any other ratings.
Dividends on Common Stock
TEP declared and paid dividends to UNS Energy of $40$50 million in2013 and $30 million in 2012. TEP did not pay any dividends to UNS Energy in 2011.2015 and $40 million in 2014 and 2013.
TEP can pay dividendsThe ACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy if it maintains complianceby TEP to no more than 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and reported to the ACC annually beginning on April 1, 2016. As of December 31, 2015, TEP Credit Agreement,had not yet reached the 2010 TEP Reimbursement Agreement50 percent of total capital and was therefore still restricted by the condition contained in the ACC's approval order.
Capital Expenditures
TEP's routine capital expenditures include funds used for system reinforcement, replacements and betterments, and costs to comply with environmental rules and regulations. In 2015, total capital expenditures of $500 million, included the purchase of an undivided ownership interest in Springerville Unit 1 and the 2013 Covenants Agreement. At December 31, 2013, TEP was in compliance with the terms of the TEP Credit Agreement, the 2010 TEP Reimbursement Agreement and the 2013 Covenants Agreement.


UNS ELECTRIC
RESULTS OF OPERATIONS
UNS Electric reported net income of $12 million in 2013, $17 million in 2012, and $18 million in 2011. The decline in net income in 2013 is related to a reduction in mining kWh sales as well as the loss of an industrial customer during the fourth quarter of 2012.
Like TEP, UNS Electric’s operations are typically seasonal in nature, with peak energy demand occurringremaining ownership interest in the summer months. The table below provides summary financial informationSpringerville Coal Handling facilities. In 2014, total capital expenditures of $507 million, included the purchase of interest in Gila River Unit 3 and an undivided ownership interest in Springerville Unit 1. Construction for UNS Electric:a new 500-kilovolt (kV) transmission line in Pinal County that began in December 2014 and concluded in late 2015, totaled $79 million.

29



With the exception of 2017, we expect capital requirements to remain stable from 2016 through 2020. TEP's forecasted capital expenditures are summarized below:
 2013 2012 2011
 Millions of Dollars
Retail Electric Revenues$168
 $171
 $182
Wholesale Electric Revenues6
 17
 6
Other Revenues2
 2
 2
Total Operating Revenues176
 190
 190
Purchased Energy Expense7
 81
 91
Fuel Expense76
 10
 7
Transmission Expense13
 11
 12
Increase (Decrease) to Reflect PPFAC Recovery(2) (1) (4)
O&M32
 31
 27
Depreciation and Amortization Expense19
 18
 17
Taxes Other Than Income Taxes6
 4
 4
Total Other Operating Expenses151
 154
 154
Operating Income25
 36
 36
Other Income1
 
 
Interest Expense7
 8
 7
Income Tax Expense7
 11
 11
Net Income$12
 $17
 18

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The table below shows UNS Electric’s kWh sales and margin revenues:
 2013 2012 
Percent(1)
 2011 
Percent(1)
Electric Retail Sales, kWh (in Millions):         
Residential844
 836
 1.0 % 828
 1.0 %
Commercial607
 614
 (1.2)% 602
 2.0 %
Industrial185
 213
 (13.2)% 221
 (3.5)%
Mining61
 91
 (32.7)% 200
 (54.8)%
Other2
 2
 20.5 % 2
 (1.7)%
Total Electric Retail Sales1,699
 1,756
 (3.2)% 1,853
 (5.3)%
       
Retail Margin Revenues (in Millions):      
Residential$32
 $32
 0.9 % $31
 2.6 %
Commercial28
 29
 (1.7)% 29
  %
Industrial8
 9
 (14.4)% 9
  %
Mining4
 7
 (34.4)% 7
 (1.5)%
Other
 
  % 
 (33.3)%
Total Retail Margin Revenues (Non-GAAP)(2)
$72
 $77
 (4.8)% $76
 0.8 %
Fuel and Purchased Power Revenues88
 83
 5.0 % 99
 71.2 %
RES & DSM Revenues8
 11
 (31.9)% 7
 (15.9)%
Total Retail Revenues (GAAP)$168
 $171
 (1.8)% $182
 (5.8)%
Weather Data:         
Cooling Degree Days         
Year Ended December 31,3,278
 3,489
 (6.0)% 3,243
 7.6 %
10-Year Average3,271
 3,285
 NM
 3,283
 NM
(in millions)2016 2017 2018 2019 2020
Generation Facilities:         
Environmental Compliance$39
 $27
 $11
 $2
 $2
Renewable Energy27
 27
 27
 27
 27
Springerville Common Lease Purchase
 38
 
 
 
Other Generation Facilities34
 82
 31
 36
 39
Total Generation Facilities100
 174
 69
 65
 68
Transmission and Distribution122
 112
 159
 154
 163
General and Other (1)
52
 46
 56
 57
 54
Total Capital Expenditures$274
 $332
 $284
 $276
 $285
(1) 
Percent change calculated on un-rounded dataGeneral and may not correspond exactly to data shown in table.
(2)
Total Retail Margin Revenues, a non-GAAP financial measure, should not be consideredOther primarily includes cost for information technology as an alternative to Total Retail Revenues, which is determined in accordance with GAAP. Total Retail Margin Revenues exclude revenues collected from retail customers that are directly offset by expenses recorded in other line items. We believe the change in Total Retail Margin Revenues between periods provides useful information to investors because it demonstrates the underlying revenue trendwell as fleet, facilities and performance of our core utility business. Total Retail Margin Revenues represents the portion of retail operating revenues available to cover the non-fuel operating expenses of our core utility business.communication equipment.
In 2013, total retail kWh sales decreased by 3.2%These estimates are subject to continuing review and retail margin revenues decreased by 4.8% compared with 2012. The decline in sales volumes and resulting reduction in retail margin revenues is due primarily to one of UNS Electric's mining customers generating a portion of its own electricity and the loss of an industrial customer in the fourth quarter of 2012.

FACTORS AFFECTING RESULTS OF OPERATIONS
2013 UNS Electric Rate Order
In December 2012, UNS Electric filed a rate case application with the ACC as required by the ACC in UNS Electric's 2010 rate order. UNS Electric's rate filing was based on a test year ended June 30, 2012.
In December 2013, the ACC approved a new rate structure for UNS Electric that became effective on January 1, 2014 (2013 UNS Electric Rate Order). The provisions of the 2013 UNS Electric Rate Order include, but are not limited to:
an increase in non-fuel retail Base Rates of approximately $3 million;
an Original Cost Rate Base (OCRB) of approximately $213 million and a Fair Value Rate Base (FVRB) of approximately $283 million;

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a return on equity of 9.50% and a long-term cost of debt of 5.97% resulting in a weighted average cost ofadjustment. Actual capital of 7.83%;
a 0.50% return on the fair value increment of rate base (the fair value increment of rate base represents the difference between OCRB and FVRB of approximately $70 million); and
a capital structure of 52.6% equity and 47.4% long-term debt.
The 2013 UNS Electric Rate Order also approved the following cost recovery mechanisms:
an LFCR mechanism that will allow UNS Electric to recover certain non-fuel costs that would otherwise go unrecoveredexpenditures may differ from these estimates due to reduced kWh sales attributed to compliance with the ACC's Electric EE Standards and distributed generation requirements under the ACC's RES. The LFCR is not a full decoupling mechanism because it is not intended to recover lost fixed costs attributable to weather or economic conditions; and
a Transmission Cost Adjustment Mechanism (TCA) that will allow more timely recovery of transmission costs associated with serving retail customers at the level approved by FERC. UNS Electric's approved Base Rates include a transmission component based on UNS Electric’s current FERC Open Access Transmission Tariff (OATT) rate. The OATT rates are adjusted annually and the TCA will be limited to the recovery (or refund) of costs associated with future changes in UNS Electric’s OATT rate. UNS Electric expects to make an informational TCA filing with the ACC onbusiness conditions, construction schedules, environmental requirements, state or before May 1, 2014. The filing will include an updated retail transmission rate calculated pursuant to UNS Electric's OATT rate.
Gila River Generating Station Unit 3
In December 2013, TEPfederal regulations and UNS Electric entered into an agreement to purchase Gila River Unit 3 for $219 million. It is anticipated that TEP will purchase a 75% undivided interest in Gila River Unit 3 (413 MW) for approximately $164 million and UNS Electric will purchase the remaining 25% undivided interest (137 MW) for approximately $55 million, although TEP and UNS Electric may modify the percentage ownership allocation between them.other factors. We expect the transaction to close in December 2014. See Tucson Electric, Factors Affecting Results of Operations, Gila River Generating Station Unit 3 and Note 8.
Also in December 2013, UNS Electric filed an application requesting the ACC to approve an accounting order that would authorize UNS Electric to deferpay for future recovery specific non-fuel operating costs associated with Gila River Unit 3. If UNS Electric purchases 25% of Gila River Unit 3, the deferred costs, including depreciation, amortization, property taxes, O&M expense and a carrying cost on UNS Electric's investment in Gila River Unit 3, are expected to total approximately $9 million by the end of 2015. We cannot predict if the ACC will approve UNS Electric's request.
Competition
See Tucson Electric Power, Factors Affecting Results of Operations, Competition.
Fair Value Measurements
UNS Electric’s income statement exposure to risk is mitigated as UNS Electric reports the change in fair value of energy contract derivatives as a regulatory asset or a regulatory liability rather than in the income statement. See Note 15.

LIQUIDITY AND CAPITAL RESOURCES
Liquidity Outlook
UNS Electric expects operating cash flows to fund a portion of its construction expenditures during 2014. Additional sources of fundingforecasted capital expenditures could include drawswith cash on the UNS Electric/UNS Gas Revolver, additional credit lines, the issuance of long-term debt, or capital contributions from UNS Energy.

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Cash Flowshand, internally generated funds, and Capital Expendituresshort-term revolver borrowings.
Contractual Obligations
The table below provides summary cash flow information for UNS Electric:following chart displays TEP’s contractual obligations by maturity and by type of obligation as of December 31, 2015:
 2013 2012 2011
 Millions of Dollars
Cash Provided By (Used In):     
Operating Activities$43
 $50
 $43
Investing Activities(59) (37) (93)
Financing Activities13
 (10) 44
Net Increase/(Decrease) in Cash(3) 3
 (6)
Beginning Cash8
 5
 11
Ending Cash$5
 $8
 $5
Operating Activities
Cash provided by operating activities decreased by $7 million in 2013 when compared with 2012 due primarily to a $6 million decrease in cash receipts from electric sales (net of fuel and purchased energy costs paid) caused by a lower PPFAC rate effective in June 2012, the loss of an industrial customer, and lower mining sales volumes.
Investing Activities
UNS Electric had capital expenditures of $56 million in 2013 compared with $38 million in 2012. The increase is related to a transmission line that was constructed to increase reliability to UNS Electric's service territory in Nogales, Arizona.
Financing Activities
Cash provided by financing activities at UNS Electric in 2013 increased by $23 million when compared with 2012. Financing activities in 2013 included $22 million of borrowings under the UNS Electric/UNS Gas Revolver (net of repayments) and a $2 million receipt related to a contribution in aid of construction from a large customer.
UNS Electric/UNS Gas Credit Agreement
The UNS Electric/UNS Gas Credit Agreement consists of a $100 million unsecured revolving credit and revolving letter of credit facility. Either company can borrow up to a maximum of $70 million as long as the combined amount borrowed does not exceed $100 million. The UNS Electric/UNS Gas Credit Agreement expires November 2016.
UNS Electric is only liable for UNS Electric’s borrowings, and similarly, UNS Gas is only liable for UNS Gas' borrowings under the UNS Electric/UNS Gas Credit Agreement.
The UNS Electric/UNS Gas Credit Agreement restricts additional indebtedness, liens, and mergers. It also requires each borrower not to exceed a maximum leverage ratio. Each borrower may pay dividends so long as it maintains compliance with the agreement. At December 31, 2013, UNS Electric and UNS Gas each were in compliance with the terms of the UNS Electric/UNS Gas Credit Agreement.
UNS Electric expects to draw upon the UNS Electric/UNS Gas Revolver from time to time for seasonal working capital purposes, to fund a portion of its capital expenditures or to issue LOCs to provide credit enhancement for its energy procurement and hedging activities. At December 31, 2013, UNS Electric had $22 million of outstanding borrowings and less than $1 million of LOCs issued under the UNS Electric/UNS Gas Credit Agreement.

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Contractual Obligations
 UNS Electric Contractual Obligations
Payment Due in Years Ending December 31,2014 2015 2016 2017 2018 Thereafter Other Total
 Millions of Dollars
Long-Term Debt               
Principal$
 $80
 $
 $
 $
 $50
 $
 $130
Interest7
 7
 4
 4
 4
 17
 
 43
Purchase Obligations(1):
               
Purchased Power48
 12
 
 
 
 
 
 60
Transmission4
 7
 6
 6
 5
 6
 
 34
Renewable Power Purchase Agreements6
 6
 6
 6
 6
 75
 
 105
RES Performance-Based Incentives1
 1
 1
 1
 1
 2
   7
Other Long-Term Liabilities:               
Pension & Other Post Retirement Obligations1
 
 
 
 
 
 
 1
Unrecognized Tax Benefits
 
 
 
 
 
 2
 2
Total Contractual Obligations$67
 $113
 $17
 $17
 $16
 $150
 $2
 $382
(1) Excludes the acquisition of Gila River Unit 3 pending regulatory approvals. See Note 8.
See UNS Energy Consolidated, Liquidity and Capital Resources, Contractual Obligations, for a description of these obligations.
Dividends on Common Stock
UNS Electric paid dividends to UNS Energy, through UES, of $10 million in both 2013 and 2012. UNS Electric did not pay any dividends to UNS Energy in 2011. UNS Electric’s ability to pay future dividends will depend on the cash needs for capital expenditures and various other factors.
The note purchase agreement for UNS Electric contains restrictions on dividends. UNS Electric may pay dividends so long as (i) no default or event of default exists, and (ii) it could incur additional debt under the debt incurrence test. At December 31, 2013, UNS Electric was in compliance with the terms of its note purchase agreement and the terms of the UNS Electric/UNS Gas Revolver.


UNS GAS
RESULTS OF OPERATIONS
UNS Gas reported net income of $11 million in 2013, $9 million in 2012, and $10 million in 2011. The increase in net income in 2013 is due primarily to an improvement in retail margin revenues caused by cold weather in the first and fourth quarters, which contributed to an increase retail therm sales, as well as a non-fuel base rate increase that was effective in May 2012.

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The table below provides summary financial information for UNS Gas:
 2013 2012 2011
 Millions of Dollars
Gas Revenues$131
 $128
 $148
Other Revenues3
 5
 3
Total Operating Revenues134
 133
 151
Purchased Gas Expense73
 72
 85
Increase (Decrease) to Reflect PGA Recovery Treatment(2) 2
 5
O&M26
 25
 25
Depreciation and Amortization9
 9
 8
Taxes Other Than Income Taxes4
 4
 4
Total Other Operating Expenses110
 112
 127
Operating Income24
 21
 24
Interest Expense6
 6
 7
Income Tax Expense7
 6
 7
Net Income$11
 $9
 $10
The table below includes UNS Gas' therm sales and margin revenues:
 2013 2012 
Percent(1)
 2011 
Percent(1)
Gas Retail Sales, Therms (in Millions):         
Residential76
 67
 12.7 % 74
 (9.1)%
Commercial31
 29
 7.2 % 31
 (5.7)%
All Other9
 8
 13.1 % 9
 (13.5)%
Total Gas Retail Sales116
 104
 11.2 % 114
 (8.5)%
Negotiated Sales Program (NSP)27
 32
 (15.2)% 26
 21.2 %
Total Gas Sales143
 136
 5.1 % 140
 (3.0)%
Retail Margin Revenues (in Millions):      
  
Residential$42
 $38
 9.7 % $40
 (3.5)%
Commercial12
 11
 7.4 % 11
 0.9 %
All Other2
 2
 14.3 % 2
 (4.5)%
Total Retail Margin Revenues (Non-GAAP)(2)
56
 51
 9.4 % 53
 (2.7)%
DSM Revenue1
 1
 (18.2)% 1
  %
Transport and NSP17
 16
 6.3 % 17
 (4.2)%
Retail Fuel Revenues57
 60
 (4.5)% 77
 (22.5)%
Total Gas Revenues (GAAP)$131
 $128
 2.3 % $148
 (13.2)%
Weather Data:         
Heating Degree Days         
Year Ended December 31,4,588
 4,089
 12.2 % 4.615
 (11.4)%
10-Year Average4,401
 4,431
 NM
 4,399
 NM
   Payments Due by Period
(in millions)Total Less than 1 Year 1-3 Years 3-5 Years More than 5 Years
Long-Term Debt
        
Principal (1)
$1,466
 $
 $100
 $117
 $1,249
Interest (2)
769
 59
 120
 116
 474
Capital Lease Obligations (3)
77
 17
 30
 30
 
Operating Leases: (4)

        
Land Easements and Rights-of-Way82
 1
 2
 2
 77
Operating Leases Other9
 1
 2
 2
 4
Purchase Obligations:
        
Fuel, Including Transportation (5)(6)
580
 78
 125
 90
 287
Purchased Power28
 28
 
 
 
Transmission38
 6
 12
 7
 13
Renewable Purchase Power Agreements (7)(8)
1,054
 61
 122
 121
 750
RES Performance-Based Incentives (9)
107
 8
 16
 16
 67
Acquisition of Springerville Common Facilities (10)
106
 
 38
 
 68
Other Long-Term Liabilities: (11) (12)

        
Restricted and Performance-Based Stock Units2
 
 2
 
 
Pension & Other Post Retirement Obligations (13)
77
 16
 11
 13
 37
Total Contractual Obligations$4,395
 $275
 $580
 $514
 $3,026
(1) 
Percent change calculated on un-rounded data$37 million of TEP’s variable rate bonds are backed by an LOC issued pursuant to the 2010 Reimbursement Agreement, which expires in December 2019. Although the variable rate bond matures in 2032, the above table reflects a redemption or repurchase of such bond in 2019 as though the LOC terminates without replacement upon expiration of the 2010 Reimbursement Agreement. TEP's 2013 tax-exempt variable rate IDRBs, which have an aggregate principal amount of $100 million and maymature in 2032, are subject to mandatory tender for purchase in 2018. Total long-term debt is not correspond exactly to data shown in table.reduced by $11 million of related unamortized debt issuance costs or $3 million of unamortized original issue discount.

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(2) 
Total Retail Margin Revenues,Excludes interest on revolving credit facilities and includes interest on TEP's 2013 tax-exempt IDRBs through the end of the current five-year term.
(3)
Effective with commercial operation of Springerville Unit 3 in July 2006 and Unit 4 in December 2009, Tri-State and SRP began reimbursing TEP for various operating costs related to the common facilities on an ongoing basis. The common facilities included assets leased by TEP under the Springerville Common and Springerville Coal Handling Facilities Leases. Upon expiration of the Springerville Coal Handling Lease in April 2015, TEP purchased the interests in those assets. SRP then purchased an undivided interest in those coal handling assets from TEP. Tri-State and SRP each continue to reimburse TEP for their shares of common assets owned or leased by TEP. TEP was reimbursed for $11 million of operation costs in 2015, and absent a non-GAAP financial measure, shouldpurchase of an interest in the coal handling facilities by Tri-State, will be reimbursed $10 million of operation costs in 2016. Capital Lease Obligations do not be consideredreflect any reduction associated with this reimbursement. Our capital lease obligation balances decline over time as an alternativescheduled capital lease payments are made by TEP.
(4)
TEP's operating lease expense is primarily for rail cars, office facilities, land easements, and rights-of-way with varying terms, provisions, and expiration dates.
(5)
Contemporaneously with the sale of SJCC's stock in January 2016, the existing coal sale agreement terminated and a new Coal Supply Agreement (CSA) became effective. The new CSA is between SJCC and PNM and continues through June 30, 2022. TEP is not a party to Total Gas Revenues,the new CSA, but has minimum purchase obligations under restructured ownership agreements at San Juan. Estimated future payments, not included in the table above, are $21 million in 2016, $23 million in 2017, $24 million in 2018 and 2019, $23 million in 2020, and $22 million through the end of the contract.
(6)
Excludes TEP’s liability for final environmental reclamation at the coal mines which supply the Navajo, San Juan and Four Corners generating stations as the timing of payment has not been determined. See Note 7 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP’s share of reclamation costs.
(7)
TEP enters into long-term renewable power purchase agreements which require TEP to purchase 100% of certain renewable energy generation facilities output once commercial operation status is determinedachieved. While TEP is not required to make payments under these contracts if power is not delivered, the table above includes estimated future payments based on expected power deliveries.
(8)
In February 2016, a facility achieved commercial operation status. The related contract expires in accordance with GAAP. Total Retail Margin Revenues excludes revenues collected2036. Estimated future payments, not included in the table above, are $3 million in each of 2016 through 2020 and $43 million through the end of the contract.
(9)
TEP has entered into REC purchase agreements to purchase the environmental attributes from retail customers thatwith solar installations. Payments for the RECs are directly offset by expenses recordedtermed Performance-Based Incentives (PBIs) and are paid in contractually agreed upon intervals (usually quarterly) based on metered renewable energy production. PBIs are recoverable through the RES tariff. See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding TEP's RES tariff.
(10)
The Springerville Common Facilities Leases have an initial term to December 2017 for one lease and January 2021 for the other line items. We believetwo leases, subject to optional renewal periods of two or more years through 2025. Instead of extending the changeleases, TEP may exercise its fixed-price purchase options.
(11)
Excludes asset retirement obligations of $33 million expected to occur through 2066.
(12)
Excludes unrecognized tax benefits of $5 million. At this time we are unable to make a reasonably reliable estimate of the timing of payments in Total Retail Margin Revenues between periods provides useful informationindividual years in connection with these tax liabilities.
(13)
These obligations represent TEP’s expected contributions to investors because it demonstrates the underlying revenue trendpension plans in 2016, expected benefit payments for its unfunded Supplemental Executive Retirement Plan (SERP), and performance of our core utility business. Total Retail Margin Revenues represents the portion of retail operating revenues availableexpected retiree benefit costs to cover medical and life insurance claims as determined by the non-fuel operating expenses of our core utility business.plans’ actuaries. Due to the significant impact that returns on plan assets and changes in discount rates might have on payment obligation amounts, other contributions are excluded beyond 2016.
Retail therm salesWe expect to pay for forecasted capital expenditures with cash on hand, internally generated funds, and short-term revolver borrowings.
Off Balance Sheet Arrangements
Other than the unrecorded contractual obligations in the table above, we do not have any arrangements or relationships with entities that are not consolidated into the financial statements.
Income Tax Position
Prior year tax legislation and the Consolidated Appropriations Act of 2016, include provisions that make qualified property placed in service between 2010 and 2019 eligible for bonus depreciation for tax purposes. In addition, the IRS issued new guidance related to the treatment of expenditures to maintain, replace, or improve property. These provisions are an acceleration of tax benefits TEP otherwise would have received over 20 years and have created net operating loss

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carryforwards that can be used to offset future taxable income. As a result, TEP did not pay any federal or state income taxes in 2015 and does not expect to make any payments until 2020.
Environmental Matters
The EPA regulates the amount of sulfur dioxide (SO20132 increased), nitrogen oxide (NOx), carbon dioxide (CO2), particulate matter, mercury and other by-products produced by 11.2% when comparedpower plants. TEP may incur added costs to comply with 2012 duefuture changes in federal and state environmental laws, regulations, and permit requirements at its power plants. Environmental laws and regulations are subject to a range of interpretations, which may ultimately be resolved by the courts. Because these laws and regulations continue to evolve, TEP is unable to predict the impact of the changing laws and regulations on its operations and consolidated financial results. Complying with these changes may reduce operating efficiency. TEP capitalized $33 million in 2015, $11 million in 2014, and $5 million in 2013 in costs to comply with environmental rules and regulations. In addition, we recorded O&M expenses of $6 million in 2015, $5 million in 2014, and $8 million in 2013. TEP expects to recover the cost of environmental compliance from its ratepayers.
Hazardous Air Pollutant Requirements
In February 2012, the EPA issued final rules for the control of mercury emissions and other hazardous air pollutants from power plants. Based on the EPA's final Mercury and Air Toxics Standards (MATS) rules, additional emission control equipment would have been required by April 2015. TEP, as operator of the Springerville and Sundt generating stations, and the operators of Navajo and Four Corners received extensions until April 2016 to comply with the MATS rules.
In June 2015, the U.S. Supreme Court reversed and remanded the D.C. Circuit Court of Appeals decision in Michigan v. EPA to uphold the MATS rules requiring power plants to control mercury and other emissions. The Supreme Court held that the EPA did not adequately consider “cost” before determining that MATS was “appropriate and necessary.” The D.C. Circuit Court of Appeals remanded the rules to the EPA for further consideration.
At this time, despite the U.S. Supreme Court ruling, the MATS rules remain in force and effect. TEP will proceed with its planned MATS compliance activity at each of our facilities. Additionally, Arizona has an Arizona-specific mercury rule in place that will become effective and applicable to our Arizona facilities in the event the Federal rule is struck down. Our compliance strategy is intended to ensure compliance with both the Federal and the State rule, as applicable.
TEP's share of the estimated mercury emission control costs to comply with the MATS rules includes the following:
(in millions)Navajo 
Springerville(1)
Capital Expenditures$1
 $5
Annual O&M Expenses$1
 $1
Compliance Year2016 2016
(1)
Total capital expenditures and annual O&M expenses represent amounts for Springerville Units 1 and 2, with estimated costs split equally between the two units. In January 2015, TEP completed the purchase of 24.8% of Springerville Unit 1, bringing its total ownership interest to 49.5%. With the completion of the purchase, the Third-Party Owners are responsible for 50.5% of environmental costs attributable to Springerville Unit 1. TEP will continue to be responsible for 100% of environmental costs attributable to Springerville Unit 2.
TEP expects no additional capital expenditures or O&M expenses will be incurred to comply with the MATS rules at Four Corners, Sundt, and San Juan Generating Stations.
Regional Haze Rules
The EPA's Regional Haze Rules require emission controls known as BART for certain industrial facilities emitting air pollutants that reduce visibility in national parks and wilderness areas. The rule calls for all states to establish goals and emission reduction strategies for improving visibility. States must submit these goals and strategies to the EPA for approval. Because Navajo and Four Corners are located on land leased from the Navajo Nation, they are not subject to state oversight; the EPA oversees regional haze planning for these power plants.
In the western U.S., Regional Haze BART determinations have focused on controls for NO12.2%x, often resulting in a requirement to install Selective Catalytic Reduction (SCR). Complying with the BART rule, and with other future environmental rules, may make it economically impractical to continue operating all or a portion of the Navajo, San Juan, and Four Corners power plants or for individual owners to continue to participate in these power plants. The BART provisions do not apply to Springerville Units 1 and 2 since they were constructed in the 1980s, after the time frame as designated by the rules. Other provisions of the

32



Regional Haze Rules requiring further emission reductions are not likely to impact Springerville operations until after 2018. TEP cannot predict the ultimate outcome of these matters.
TEP's estimated NOx increaseemissions control costs involved in Heating Degree Days.meeting these rules are:
(in millions)Navajo San Juan Four Corners Sundt
Capital Expenditures$28
 $12
 $44
 $12
Annual O&M Expenses$1
 $1
 $2
 $6
Compliance Year2030 2016 2018 2017
Navajo
In August 2014, the EPA published a final Federal Implementation Plan (FIP) which provides that one unit at Navajo will be shut down by 2020, SCR (or the equivalent) will be installed on the remaining two units by 2030, and conventional coal-fired generation will cease by December 2044. The increasefinal BART rule includes options that accommodate potential ownership changes at the plant. The plant has until December 2019 to notify the EPA of how it will comply with the FIP.
San Juan
In October 2014, the EPA published a final rule approving a revised State Implementation Plan (SIP) covering BART requirements for San Juan, which includes the closure of Units 2 and 3 by December 2017 and the installation of Selective Non-Catalytic Reduction (SNCR) on Units 1 and 4 by February 2016. TEP owns 50% of Units 1 and 2 at San Juan. The SIP approval references a New Source Review permit issued by the New Mexico Environment Department in retail therm sales,November 2013 which, among other things, calls for balanced draft upgrades on San Juan Unit 1 to reduce particulate matter emissions. PNM, the operator of San Juan, is currently installing SNCR. Balanced draft modifications to San Juan Unit 1were completed in June 2015. TEP’s share of the balanced draft upgrades was approximately $22 million. In December 2015, PNM obtained New Mexico Public Regulation Commission approval to shut down Units 2 and 3 at San Juan.
At December 31, 2015, the net book value of TEP's share in San Juan Unit 2, including construction work in progress, was $104 million. Consistent with the 2013 Rate Order, TEP has requested authorization from the ACC to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case.
Four Corners
In December 2013, APS, on behalf of the co-owners of Four Corners, notified the EPA that they have chosen an alternative BART compliance strategy; as a result, APS closed Units 1, 2, and 3 in December 2013 and agreed to the installation of SCR on Units 4 and 5 by July 2018. TEP owns 7% of Four Corners Units 4 and 5.
Sundt
In June 2014, the EPA issued a final rule that would require TEP to either: (i) install, by mid-2017, SNCR and dry sorbent injection if Unit 4 of the H. Wilson Sundt Generating Station (Sundt) continues to use coal as a fuel source; or (ii) permanently eliminate coal as a fuel source as a better-than-BART alternative by the end of 2017. Under the rule, TEP is required to notify the EPA of its decision by March 2017.
At December 31, 2015, the net book value of the Sundt coal handling facilities was $16 million. In August 2015, TEP exhausted its existing coal supply at Sundt and has been operating Sundt with natural gas as a primary fuel source. TEP expects to retire the Sundt coal handling facilities earlier than expected, and has requested to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case. The estimated NOx emissions control costs in the table above will not be expended if Sundt's coal handling facilities are retired early.
Greenhouse Gas Regulation
In August 2015, the EPA issued the Clean Power Plan (CPP) limiting CO2 emissions from existing and new fossil fueled power plants. The CPP establishes state-level CO2 emission rates and mass-based goals that apply to fossil fuel-fired generation. The plan targets CO2 emissions reductions for existing facilities by 2030 and establishes interim goals that begin in 2022. States are required to develop and submit a final compliance plan, or an initial plan with an extension request, to the EPA by September 2016. States that receive an extension must submit a final completed plan to the EPA by September 2018. TEP will continue to work with the other Arizona and New Mexico utilities, as well as the appropriate regulatory agencies, to develop the state compliance plans. TEP is unable to determine how the final CPP rule will impact its facilities until state plans are developed and approved by the EPA. TEP cannot predict the ultimate outcome of these matters.

33



The EPA incorporated the compliance obligations for existing power plants located on Indian nations, like the Navajo Nation, in the existing sources rule and a Base Rate increasenewly proposed Federal Plan using a compliance method similar to that of the states. The proposed Federal Plan would be implemented for any Indian nation and/or state that does not submit a plan or that does not have an EPA or approved state plan. TEP will work with the participants at Four Corners and Navajo to determine how this revision may impact compliance and operations at both facilities. TEP has submitted comments on the proposed Federal Plan impacting our facilities, including Four Corners and Navajo stating, among other things, that the EPA should not regulate the greenhouse gases on the Navajo Nation because it is not appropriate or necessary. The reduction of greenhouse gases achieved due to the shutdowns resulting from Regional Haze compliance will be equivalent to those required under the CPP rule. TEP cannot predict the ultimate outcome of these matters.
TEP's compliance requirements under the CPP are subject to the outcomes of potential proceedings and litigation challenging the rule. In February 2016, the Supreme Court granted a stay effectively ordering the EPA to stop CPP implementation efforts until legal challenges to the regulation have been resolved. The ruling introduces uncertainty as to whether and when the states and utilities will have to comply with the CPP rule. TEP will continue to work with the Arizona Department of Environmental Quality to determine what, if any, actions need to be taken in May 2012, contributedlight of the ruling. TEP anticipates that the ruling will likely delay the requirement to submit a plan or request an increaseextension under the CPP by September 2016.
Coal Combustion Residuals Regulation
In April 2015, the EPA issued a final rule requiring all coal ash and other coal combustion residuals to be treated as a solid waste under Subtitle D of the Resource Conservation and Recovery Act for disposal in retail margin revenueslandfills and/or surface impoundments while allowing for the continued recycling of coal ash. TEP does not own or operate any impoundments. Under the rule, the Springerville Generating Station (Springerville) ash landfill is classified as an existing landfill and is not subject to the lateral expansion requirements. However, TEP will incur additional costs for site preparation and monitoring at Springerville to be fully compliant with the rule. TEP’s share of the cost at Springerville is estimated to be $2 million, the majority of which is expected to be capital expenditures. TEP currently estimates its share of the costs to be $5 million at Four Corners, $3 million at Navajo, and less than $1 million at San Juan, the majority of which are expected to be capital expenditures.
See9.4% Capital Expenditures ,above for TEP's actual and forecasted environmental-related cost.

CRITICAL ACCOUNTING POLICIES
The preparation of financial statements in accordance with GAAP requires management to apply accounting policies and to make estimates and assumptions that affect results of operations and the amounts of assets and liabilities reported in the financial statements and related notes. Management believes that the areas described below require significant judgment in the application of accounting policy or in making estimates and assumptions that are inherently uncertain and that may change in subsequent periods. Additional information on TEP’s other significant accounting policies can be found in Note 1 of Notes to Consolidated Financial Statements in $5 million, when compared with 2012Item 8 of this Form 10-K.
Accounting for Regulated Operations
We account for our regulated electric operations based on accounting standards that allow the actions of our regulators, the ACC and the FERC, to be reflected in our financial statements. Regulator actions may cause us to capitalize certain costs that would otherwise be included as an expense, or in Accumulated Other Comprehensive Income (AOCI), in the current period by unregulated companies. Regulatory assets represent incurred costs that have been deferred because they are probable of future recovery in customer rates. Regulatory liabilities generally represent expected future costs that have already been collected from customers. We evaluate regulatory assets and liabilities each period and believe future recovery or settlement is probable. Our assessment includes consideration of recent rate orders, historical regulatory treatment of similar costs, and changes in the regulatory and political environment. If management's assessment is ultimately different than actual regulatory outcomes, the impact on our results of operation, financial position, and future cash flows could be material.
At December 31, 2015, regulatory liabilities net of regulatory assets totaled $96 million at TEP. There are no current or expected proposals or changes in the regulatory environment that impact our ability to apply accounting guidance for regulated operations. If we conclude, in a future period, that our operations no longer meet the criteria in this guidance, we would reflect our regulatory pension assets in AOCI and recognize the impact of other regulatory assets and liabilities in the income statement, both of which would be material to our financial statements. See Note 2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding regulatory matters.

K-6034


FACTORS AFFECTING RESULTS OF OPERATIONSAccounting for Asset Retirement Obligations
Competition
New technological developments andWe are required to record the implementationfair value of a liability for a legal obligation to retire a long-lived tangible asset in the ACC’s Gas Energy Efficiency Standards (Gas EE Standards) may reduce energy consumption by UNS Gas’ retail customers. Customers of UNS Gas also haveperiod in which the ability to switchliability is incurred. This includes obligations resulting from gas to an alternate energy source that could reduce their reliance on services provided by UNS Gas.
2012 UNS Gas Rate Order
In April 2012, the ACC approved a Base Rate increase of $2.7 million as well as a LFCR mechanism to enable UNS Gas to recover lost fixed-cost revenuesconditional future events. We incur legal obligations as a result of implementingenvironmental regulations imposed by State and Federal regulators, contractual agreements and other factors. To estimate the Gas EE Standards.liability, management must use significant judgment and assumptions in: determining whether a legal obligation exists to remove assets; estimating the probability of a future event for a conditional obligation; estimating the fair value of the cost of removal; estimating when final removal will occur; and estimating the credit-adjusted risk-free interest rates to be used to discount the future liabilities. Changes that may arise over time with regard to these assumptions and determinations will change amounts recorded in the future as expense for asset retirement obligations. TEP defers costs associated with the majority of its legal AROs as regulatory assets because these costs are included in depreciation rates approved for recovery by the ACC. Deferred costs are amortized over the life of the underlying asset.
TEP identified legal obligations to retire generation plant assets specified in land leases for its jointly-owned Navajo and Four Corners Generating Stations. The LFCRland on which these stations reside is expectedleased from the Navajo Nation. The provisions of the leases require the lessees to recover lost fixed-cost revenuesremove the facilities upon request of less than $0.1the Navajo Nation at expiration of the leases. TEP also has certain environmental obligations at the Luna, San Juan, Sundt and Springerville Generating Stations. TEP estimates that its share of the AROs to remove the Navajo and Four Corners facilities and settle the Luna, San Juan, Sundt, Gila River and Springerville environmental obligations will be approximately $157 million at the retirement dates. Additionally, TEP entered into ground lease agreements with certain land owners for the installation of photovoltaic (PV) assets. The provisions of the PV ground leases require TEP to remove the PV facilities upon expiration of the leases. TEP's ARO related to the PV assets is estimated to be approximately $30 million at the retirement dates. No other legal obligations to retire generation plant assets were identified.
TEP has various transmission and distribution lines that operate under leases and rights-of-way that contain end dates and may contain site restoration clauses. TEP operates transmission and distribution lines as if they will be operated in 2014, based on estimated lost retail therm sales from May 2012 through December 2013.perpetuity and would continue to be used or sold without land remediation. As such, there are no AROs for these assets.
The newtotal net present value of TEP's ARO liability was $32 million at December 31, 2015. ARO liabilities are reported in Regulatory and Other Liabilities—Other on the Consolidated Balance Sheets. See Note 3 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding AROs.
Additionally, the authorized depreciation rates became effectivefor TEP include a component designed to accrue the future costs of retiring assets for which no legal obligations exist. The accumulated balances at December 31, 2015 represent non-legal asset retirement obligation accruals, less actual removal costs incurred, net of salvage proceeds realized, and are included in Regulatory and Other Liabilities, Regulatory Liabilities on May 1, 2012. The impactthe Consolidated Balance Sheets. See Note 2 of the Base Rate increase on customers’ bills was offset by a temporary credit adjustmentNotes to the PGA. SeeConsolidated Financial Statements Purchased Gas Adjustorin Item 8 of this Form 10-K for additional information.
Fair Value MeasurementsPension and Other Retiree Benefit Plan Assumptions
UNS Gas’ income statement exposureTEP records plan assets, obligations, and expenses related to riskpension and other retiree benefit plans based on actuarial valuations, which include key assumptions on discount rates, expected returns on plan assets, compensation increases, and health care cost trend rates. These actuarial assumptions are reviewed annually and modified as appropriate. The effect of modifications is mitigatedgenerally recorded or amortized over future periods. We believe that the assumptions used in recording obligations are reasonable based on prior experience, market conditions, and the advice of plan actuaries. Note 8 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K discusses the assumptions used in the calculation of pension plan and other retiree plan obligations.
TEP is required to recognize the underfunded status of its defined benefit pension and other retiree plans as UNS Gas reportsa liability. The underfunded status is the change indifference between the fair value of the plans assets and the projected benefit obligation for pension plans or accumulated retiree benefit obligation for other retiree benefit plans. As the funded status, discount rates, and actuarial facts change, the liability will vary significantly in future years. TEP records the underfunded amount for its pension and other retiree obligations as a liability and a regulatory asset to reflect expected recovery of pension and other retiree obligations through the rates charged to retail customers.
At December 31, 2015, TEP discounted its future pension plan obligations at rates between 4.5% and 4.6% and its other retiree plan obligations at a rate of 4.2%. The discount rate for future pension plan and other retiree plan obligations is determined annually based on the rates currently available on high-quality, non-callable, long-term bonds. The discount rate is based on a corporate yield curve using an average yield between the 60th and 90th percentile of AA-graded U.S. corporate bonds with future cash flows that match the timing and amount of expected future benefit payments. For TEP’s pension plans, a 25-basis point change in the discount rate would increase or decrease the Projected Benefit Obligation (PBO) by approximately $15

35



million and the plan expense by $1 million. For TEP’s other retiree benefit plan, a 25-basis point change in the discount rate would increase or decrease the Accumulated Postretirement Benefit Obligation (APBO) by approximately $2 million.
We measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. As discussed in Note 8 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K, at the end of 2015, we changed our approach to determine the service and interest cost components of pension and other postretirement benefit expense for future years. For 2016, we elected to measure service and interest costs by applying the specific spot rates along that yield curve to the plan's liability cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans' liability cash flows to the corresponding spot rates on the yield curve. The use of this approach reduces 2016 service and interest cost by $4 million with a corresponding increase to regulatory assets. This change does not affect the measurement of our plan obligations nor the funded status of our plans.
TEP calculates the market-related value of pension plan assets using the fair value of the assets on the measurement date. TEP assumed that its pension plans’ assets would generate a long-term rate of return of 7% at December 31, 2015. In establishing its assumption as to the expected return on assets, TEP reviews the asset allocation and develops return assumptions for each asset class based on advice from an investment consultant and the pension’s actuary that includes both historical performance analysis and forward-looking views of the financial markets. Pension expense decreases as the expected rate of return on assets increases. A 25-basis point change in the expected return on assets would impact pension expense in 2015 by $1 million.
TEP adopted the RP-2014 mortality table projected with improvement scale MP-2015 with 15 year convergence and 0.75% long term rate to measure December 31, 2015 pension obligations, whereas RP-2000 mortality table with Scale BB was utilized for the December 31, 2014 measurement.
TEP used a current year health care cost trend rate of 7.6% in valuing its retiree benefit obligation at December 31, 2015. This rate reflects both market conditions and historical experience. Assumed health care cost trend rates have a significant effect on the amounts reported for health care plans. A one-percentage point change in assumed health care cost trend rates would increase the retiree benefit obligation by approximately $6 million and decrease the retiree benefit obligation by approximately $5 million. In addition, a one-percentage point change in assumed health care cost trend rates would change the related 2016 plan expense by approximately $1 million.
In 2016, TEP will incur pension costs of approximately $11 million and other retiree benefit costs of approximately $5 million. TEP expects to charge approximately $13 million of these costs to O&M expense, and $3 million to capital. TEP expects to make pension plan contributions of $10 million in 2016. In 2009, TEP established a VEBA trust to fund its other retiree benefit plan. In 2016, TEP expects to make benefit payments to retirees under the retiree benefit plan of approximately $5 million and contributions to the VEBA trust of approximately $1 million, net of distributions.
Accounting for Derivative Instruments and Hedging Activities
Commodity Derivative Contracts
TEP enters into forward contracts to purchase or sell capacity or energy at contract derivativesprices over a given period of time, typically for one month, three months, or one year, within established limits to meet forecasted load requirements or to take advantage of favorable market opportunities. In general, TEP enters into forward purchase contracts when market conditions provide the opportunity to purchase energy for its load at prices that are below the marginal cost of its supply resources or to supplement its own resources (e.g., during plant outages and summer peaking periods). TEP enters into forward sales contracts when it forecasts that it will have excess supply and the market price of energy exceeds its marginal cost. TEP enters into forward gas commodity price swap agreements to lock in fixed prices on a portion of forecasted gas purchases and to hedge the price risk associated with forward PPAs that are indexed to natural gas prices.
For all commodity derivative instruments that do not meet the normal purchase or normal sale scope exception, we recognize derivative instruments as either assets or liabilities on the Consolidated Balance Sheets and measure those instruments at fair value. Unrealized gains and losses on commodity derivative contracts entered into for retail customer load are recorded as either a regulatory asset or a regulatory liability rather thanon the balance sheet based on our ability to recover the costs of hedging activities entered into to mitigate energy price risk for retail customers. There are no current or expected proposals or changes in the regulatory environment that impact the probability of future recovery of these assets through the PPFAC mechanism.
The market prices used to determine fair values for TEP’s derivative instruments at December 31, 2015, are estimated based on various factors including broker quotes, exchange prices, over the counter prices, and time value.

36



TEP manages the risk of counterparty default by performing financial credit reviews, setting limits, monitoring exposures, requiring collateral when needed, and using a standardized agreement, which allows for the netting of current period exposures to and from a single counterparty.
Interest Rate Swaps
TEP hedges the cash flow risk associated with unfavorable changes in the variable interest rates tied to LIBOR on the Springerville Common Facilities Lease. As of December 31, 2015, approximately $29 million of variable rate lease debt for the Springerville Common Facilities Lease had been hedged through an interest rate swap agreement through January 2020.
Revenue Recognition
TEP’s retail revenues, which are recognized in the period that electricity is delivered and consumed by customers, include unbilled revenue based on an estimate of kWh delivered at the end of each period. Unbilled revenues are dependent upon a number of factors that require management’s judgment including estimates of retail sales and customer usage patterns. The unbilled revenue is estimated by comparing the estimated kWh delivered to the kWh billed to our retail customers. The excess of estimated kWh delivered over kWh billed is then allocated to the retail customer classes based on estimated usage by each customer class. We then record revenue for each customer class based on the various Retail Rates for each customer class. Due to the seasonal fluctuations of TEP’s actual load, the unbilled revenue amount increases during the spring and summer and decreases during the fall and winter. A provision for uncollectible accounts, associated with retail revenues, is recorded as a component of O&M expense.
Plant Asset Depreciable Lives
TEP has significant investments in electric generation assets and electric transmission and distribution assets. We calculate depreciation expense based on our estimate of the useful lives of our plant assets and expected net removal costs. The useful lives of plant assets are further detailed in Note 3 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K. Changes to depreciation estimates resulting from a change of estimated service life or removal costs could have a significant impact on the amount of depreciation expense recorded in the income statement. The ACC approves depreciation rates for all generation and distribution assets. Depreciation rates for such assets cannot be changed without the ACC's approval. TEP's transmission assets are subject to the jurisdiction of the FERC. See Note 1 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding depreciation rates.
Income Taxes
Due to the differences between GAAP and income tax laws, many transactions are treated differently for income tax purposes than they are in the financial statements. We account for this difference by recording deferred income tax assets and liabilities using the effective income tax rate at our balance sheet date. Income tax liabilities are allocated to TEP based on TEP's taxable income and deductions as reported in the FortisUS, Inc. consolidated tax return.
A valuation allowance is established against deferred tax assets for which management believes it is more likely than not that the deferred asset will not be realized. In making this judgment, management evaluates all available evidence and gives more weight to objective verifiable evidence. At December 31, 2015, TEP had a $4 million valuation allowance. See Note 1512 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.

LIQUIDITYRECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
For a discussion of new accounting pronouncements affecting TEP, refer to Note 13 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K.


37



ITEM 7A. QUANTITATIVE AND CAPITAL RESOURCESQUALITATIVE DISCLOSURES ABOUT MARKET RISK
Liquidity OutlookMarket Risks
UNS Gas expects operatingTEP’s primary market risks include fluctuations in interest rates, returns on marketable securities, commodity prices and volumes, and counterparty credit. Fluctuations in interest rates can affect earnings and cash flows. We enter into interest rate swaps and financing transactions to manage changes in interest rates. Fluctuations in commodity prices and volumes and counterparty credit losses may temporarily affect cash flows, but are not expected to fund all of its construction expenditures during 2014. If natural gas prices rise and UNS Gas is not allowedaffect earnings due to recover its projected gas costs or PGA bank balance on a timely basis, UNS Gas may require additional funding to meet operating and capital requirements in future periods. Sources of funding future capital expenditures could include existing cash balances, draws on the UNS Electric/UNS Gas Revolver, additional credit lines, the issuance of long-term debt, or capital contributions from UNS Energy.
Cash Flows and Capital Expenditures
The table below provides summary cash flow information for UNS Gas:
 2013 2012 2011
 Millions of Dollars
Cash Provided By (Used In):     
Operating Activities$27
 $28
 $32
Investing Activities(15) (15) (12)
Financing Activities(10) (20) (11)
Net Increase/(Decrease) in Cash2
 (7) 9
Beginning Cash31
 38
 29
Ending Cash$33
 $31
 $38
UNS Gas' operating cash flows during 2013 were $1 million lower than 2012 due in part to the PGA credit that was effective in April 2012.
UNS Electric/UNS Gas Credit Agreement
At December 31, 2013, UNS Gas had no outstanding borrowings under the UNS Electric/UNS Gas Credit Agreement.expected recovery through regulatory mechanisms.
See UNS Electric, Liquidity and Capital Resources, UNS Electric/UNS Gas Credit AgreementForward-Looking Information for additional information.

Risk Management Committee
K-61

TableWe have a Risk Management Committee responsible for the oversight of Contentscommodity price risk and credit risk related to the wholesale energy marketing and power procurement activities of TEP. Our Risk Management Committee, which meets on a quarterly basis and as needed, consists of officers from the finance, accounting, legal, wholesale marketing, and generation operations departments of TEP. To limit TEP’s exposure to commodity price risk, the Risk Management Committee sets trading and hedging policies and limits, which are reviewed frequently to respond to constantly changing market conditions. To limit TEP’s exposure to credit risk, the Risk Management Committee reviews counterparty credit exposure as well as credit policies and limits.

Interest Rate RiskAccounting for Asset Retirement Obligations
UNS GasWe are required to record the fair value of a liability for a legal obligation to retire a long-lived tangible asset in the period in which the liability is subject to interest rate riskincurred. This includes obligations resulting from changes inconditional future events. We incur legal obligations as a result of environmental regulations imposed by State and Federal regulators, contractual agreements and other factors. To estimate the liability, management must use significant judgment and assumptions in: determining whether a legal obligation exists to remove assets; estimating the probability of a future event for a conditional obligation; estimating the fair value of the cost of removal; estimating when final removal will occur; and estimating the credit-adjusted risk-free interest rates to be used to discount the future liabilities. Changes that may arise over time with regard to these assumptions and determinations will change amounts recorded in the future as expense for asset retirement obligations. TEP defers costs associated with the majority of its legal AROs as regulatory assets because these costs are included in depreciation rates approved for recovery by the ACC. Deferred costs are amortized over the life of the underlying asset.
TEP identified legal obligations to retire generation plant assets specified in land leases for its jointly-owned Navajo and Four Corners Generating Stations. The land on which these stations reside is leased from the Navajo Nation. The provisions of the leases require the lessees to remove the facilities upon request of the Navajo Nation at expiration of the leases. TEP also has certain environmental obligations at the Luna, San Juan, Sundt and Springerville Generating Stations. TEP estimates that its borrowingsshare of the AROs to remove the Navajo and Four Corners facilities and settle the Luna, San Juan, Sundt, Gila River and Springerville environmental obligations will be approximately $157 million at the retirement dates. Additionally, TEP entered into ground lease agreements with certain land owners for the installation of photovoltaic (PV) assets. The provisions of the PV ground leases require TEP to remove the PV facilities upon expiration of the leases. TEP's ARO related to the PV assets is estimated to be approximately $30 million at the retirement dates. No other legal obligations to retire generation plant assets were identified.
TEP has various transmission and distribution lines that operate under its revolving credit facility. leases and rights-of-way that contain end dates and may contain site restoration clauses. TEP operates transmission and distribution lines as if they will be operated in perpetuity and would continue to be used or sold without land remediation. As such, there are no AROs for these assets.
The interest paidtotal net present value of TEP's ARO liability was $32 million at December 31, 2015. ARO liabilities are reported in Regulatory and Other Liabilities—Other on revolving credit borrowings is variable. If LIBOR or other benchmark interestthe Consolidated Balance Sheets. See Note 3 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding AROs.
Additionally, the authorized depreciation rates increase, UNS Gas may be requiredfor TEP include a component designed to pay higher ratesaccrue the future costs of interestretiring assets for which no legal obligations exist. The accumulated balances at December 31, 2015 represent non-legal asset retirement obligation accruals, less actual removal costs incurred, net of salvage proceeds realized, and are included in Regulatory and Other Liabilities, Regulatory Liabilities on borrowings under its revolving credit facility.the Consolidated Balance Sheets. See Note 2 of Notes to Consolidated Financial Statements in Item 7A. Quantitative and Qualitative Disclosures about Market Risk8 of this Form 10-K for additional information.
Contractual ObligationsPension and Other Retiree Benefit Plan Assumptions
TEP records plan assets, obligations, and expenses related to pension and other retiree benefit plans based on actuarial valuations, which include key assumptions on discount rates, expected returns on plan assets, compensation increases, and health care cost trend rates. These actuarial assumptions are reviewed annually and modified as appropriate. The following table displays UNS Gas’ contractualeffect of modifications is generally recorded or amortized over future periods. We believe that the assumptions used in recording obligations are reasonable based on prior experience, market conditions, and the advice of plan actuaries. Note 8 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K discusses the assumptions used in the calculation of pension plan and other retiree plan obligations.
TEP is required to recognize the underfunded status of its defined benefit pension and other retiree plans as a liability. The underfunded status is the difference between the fair value of the plans assets and the projected benefit obligation for pension plans or accumulated retiree benefit obligation for other retiree benefit plans. As the funded status, discount rates, and actuarial facts change, the liability will vary significantly in future years. TEP records the underfunded amount for its pension and other retiree obligations as a liability and a regulatory asset to reflect expected recovery of pension and other retiree obligations through the rates charged to retail customers.
At December 31, 20132015, TEP discounted its future pension plan obligations at rates between 4.5% and 4.6% and its other retiree plan obligations at a rate of 4.2%. The discount rate for future pension plan and other retiree plan obligations is determined annually based on the rates currently available on high-quality, non-callable, long-term bonds. The discount rate is based on a corporate yield curve using an average yield between the 60th and 90th percentile of AA-graded U.S. corporate bonds with future cash flows that match the timing and amount of expected future benefit payments. For TEP’s pension plans, a 25-basis point change in the discount rate would increase or decrease the Projected Benefit Obligation (PBO) by maturityapproximately $15

35



million and the plan expense by type$1 million. For TEP’s other retiree benefit plan, a 25-basis point change in the discount rate would increase or decrease the Accumulated Postretirement Benefit Obligation (APBO) by approximately $2 million.
We measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. As discussed in Note 8 of obligation:Notes to Consolidated Financial Statements in Item 8 of this Form 10-K, at the end of 2015, we changed our approach to determine the service and interest cost components of pension and other postretirement benefit expense for future years. For 2016, we elected to measure service and interest costs by applying the specific spot rates along that yield curve to the plan's liability cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans' liability cash flows to the corresponding spot rates on the yield curve. The use of this approach reduces 2016 service and interest cost by $4 million with a corresponding increase to regulatory assets. This change does not affect the measurement of our plan obligations nor the funded status of our plans.
 UNS Gas Contractual Obligations
Payment Due in Years Ending December 31,2014 2015 2016 2017 2018 Thereafter Other Total
 Millions of Dollars
Long-Term Debt               
Principal$
 $50
 $
 $
 $
 $50
 $
 $100
Interest6
 6
 3
 3
 3
 20
 
 41
Operating Leases1
 1
 1
 
 
 
 
 3
Purchase Obligations:               
Fuel26
 20
 16
 13
 13
 60
 
 148
Other Long-Term Liabilities:               
Pension & Other Post Retirement Obligations1
 
 
 
 
 
 
 1
Total Contractual Obligations$34
 $77
 $20
 $16
 $16
 $130
 $
 $293
TEP calculates the market-related value of pension plan assets using the fair value of the assets on the measurement date. TEP assumed that its pension plans’ assets would generate a long-term rate of return of 7% at December 31, 2015. In establishing its assumption as to the expected return on assets, TEP reviews the asset allocation and develops return assumptions for each asset class based on advice from an investment consultant and the pension’s actuary that includes both historical performance analysis and forward-looking views of the financial markets. Pension expense decreases as the expected rate of return on assets increases. A 25-basis point change in the expected return on assets would impact pension expense in 2015 by $1 million.
DividendsTEP adopted the RP-2014 mortality table projected with improvement scale MP-2015 with 15 year convergence and 0.75% long term rate to measure December 31, 2015 pension obligations, whereas RP-2000 mortality table with Scale BB was utilized for the December 31, 2014 measurement.
TEP used a current year health care cost trend rate of 7.6% in valuing its retiree benefit obligation at December 31, 2015. This rate reflects both market conditions and historical experience. Assumed health care cost trend rates have a significant effect on Common Stockthe amounts reported for health care plans. A one-percentage point change in assumed health care cost trend rates would increase the retiree benefit obligation by approximately $6 million and decrease the retiree benefit obligation by approximately $5 million. In addition, a one-percentage point change in assumed health care cost trend rates would change the related 2016 plan expense by approximately $1 million.
UNS Gas paid dividendsIn 2016, TEP will incur pension costs of approximately $11 million and other retiree benefit costs of approximately $5 million. TEP expects to UNS Energy, through UES,charge approximately $13 million of these costs to O&M expense, and $3 million to capital. TEP expects to make pension plan contributions of $10 million 2013, $20 million in 2012, and $10 million in 2011. UNS Gas’ ability2016. In 2009, TEP established a VEBA trust to pay future dividends will depend on the cash needs for capital expenditures and variousfund its other factors.
The note purchase agreement for UNS Gas contains restrictions on dividends. UNS Gas may pay dividends so long as (i) no default or event of default exists, (ii) it could incur additional debtretiree benefit plan. In 2016, TEP expects to make benefit payments to retirees under the debt incurrence test. At December 31, 2013, UNS Gas was in compliance withretiree benefit plan of approximately $5 million and contributions to the termsVEBA trust of its note purchase agreement and had sufficient additional debt under the debt incurrence test to pay dividends.


K-62


CRITICAL ACCOUNTING POLICIES
The preparation of financial statements in accordance with GAAP requires management to apply accounting policies and to make estimates and assumptions that affect results of operations and the amounts of assets and liabilities reported in the financial statements and related notes. Management believes that the areas described below require significant judgment in the application of accounting policy or in making estimates and assumptions that are inherently uncertain and that may change in subsequent periods. Additional information on UNS Energy’s other significant accounting policies can be found in Note 1.distributions.
Accounting for Regulated OperationsDerivative Instruments and Hedging Activities
We accountCommodity Derivative Contracts
TEP enters into forward contracts to purchase or sell capacity or energy at contract prices over a given period of time, typically for our regulated electricone month, three months, or one year, within established limits to meet forecasted load requirements or to take advantage of favorable market opportunities. In general, TEP enters into forward purchase contracts when market conditions provide the opportunity to purchase energy for its load at prices that are below the marginal cost of its supply resources or to supplement its own resources (e.g., during plant outages and summer peaking periods). TEP enters into forward sales contracts when it forecasts that it will have excess supply and the market price of energy exceeds its marginal cost. TEP enters into forward gas operationscommodity price swap agreements to lock in fixed prices on a portion of forecasted gas purchases and to hedge the price risk associated with forward PPAs that are indexed to natural gas prices.
For all commodity derivative instruments that do not meet the normal purchase or normal sale scope exception, we recognize derivative instruments as either assets or liabilities on the Consolidated Balance Sheets and measure those instruments at fair value. Unrealized gains and losses on commodity derivative contracts entered into for retail customer load are recorded as either a regulatory asset or regulatory liability on the balance sheet based on accounting standards that allowour ability to recover the actionscosts of our regulators, the ACC and the FERC,hedging activities entered into to be reflected in our financial statements. Regulator actions may cause us to capitalize certain costs that would otherwise be included as an expense, or in Accumulated Other Comprehensive Income (AOCI), in the current period by unregulated companies. Regulatory assets represent incurred costs that have been deferred because they are probable of future recovery in customer rates. Regulatory liabilities generally represent expected future costs that have already been collected frommitigate energy price risk for retail customers. We evaluate regulatory assets and liabilities each period and believe future recovery or settlement is probable. Our assessment includes consideration of recent rate orders, historical regulatory treatment of similar costs, and changes in the regulatory and political environment. If management's assessment is ultimately different than actual regulatory outcomes, the impact on our results of operation, financial position, and future cash flows could be material.
At December 31, 2013, regulatory liabilities net of regulatory assets totaled $103 million at TEP, $9 million at UNS Electric and $40 million at UNS Gas. There are no current or expected proposals or changes in the regulatory environment that impact our abilitythe probability of future recovery of these assets through the PPFAC mechanism.
The market prices used to apply regulated operations accounting. If we conclude,determine fair values for TEP’s derivative instruments at December 31, 2015, are estimated based on various factors including broker quotes, exchange prices, over the counter prices, and time value.

36



TEP manages the risk of counterparty default by performing financial credit reviews, setting limits, monitoring exposures, requiring collateral when needed, and using a standardized agreement, which allows for the netting of current period exposures to and from a single counterparty.
Interest Rate Swaps
TEP hedges the cash flow risk associated with unfavorable changes in a futurethe variable interest rates tied to LIBOR on the Springerville Common Facilities Lease. As of December 31, 2015, approximately $29 million of variable rate lease debt for the Springerville Common Facilities Lease had been hedged through an interest rate swap agreement through January 2020.
Revenue Recognition
TEP’s retail revenues, which are recognized in the period that electricity is delivered and consumed by customers, include unbilled revenue based on an estimate of kWh delivered at the end of each period. Unbilled revenues are dependent upon a number of factors that require management’s judgment including estimates of retail sales and customer usage patterns. The unbilled revenue is estimated by comparing the estimated kWh delivered to the kWh billed to our operations no longer meetretail customers. The excess of estimated kWh delivered over kWh billed is then allocated to the criteriaretail customer classes based on estimated usage by each customer class. We then record revenue for each customer class based on the various Retail Rates for each customer class. Due to the seasonal fluctuations of TEP’s actual load, the unbilled revenue amount increases during the spring and summer and decreases during the fall and winter. A provision for uncollectible accounts, associated with retail revenues, is recorded as a component of O&M expense.
Plant Asset Depreciable Lives
TEP has significant investments in electric generation assets and electric transmission and distribution assets. We calculate depreciation expense based on our estimate of the useful lives of our plant assets and expected net removal costs. The useful lives of plant assets are further detailed in Note 3 of Notes to Consolidated Financial Statements in Item 8 of this guidance, we would reflect our regulatory pensionForm 10-K. Changes to depreciation estimates resulting from a change of estimated service life or removal costs could have a significant impact on the amount of depreciation expense recorded in the income statement. The ACC approves depreciation rates for all generation and distribution assets. Depreciation rates for such assets cannot be changed without the ACC's approval. TEP's transmission assets are subject to the jurisdiction of the FERC. See Note 1 of Notes to Consolidated Financial Statements in AOCIItem 8 of this Form 10-K for additional information regarding depreciation rates.
Income Taxes
Due to the differences between GAAP and recognizeincome tax laws, many transactions are treated differently for income tax purposes than they are in the impact of other regulatoryfinancial statements. We account for this difference by recording deferred income tax assets and liabilities using the effective income tax rate at our balance sheet date. Income tax liabilities are allocated to TEP based on TEP's taxable income and deductions as reported in the income statements, bothFortisUS, Inc. consolidated tax return.
A valuation allowance is established against deferred tax assets for which management believes it is more likely than not that the deferred asset will not be realized. In making this judgment, management evaluates all available evidence and gives more weight to objective verifiable evidence. At December 31, 2015, TEP had a $4 million valuation allowance. See Note 12 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
For a discussion of new accounting pronouncements affecting TEP, refer to Note 13 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K.


37



ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
Market Risks
TEP’s primary market risks include fluctuations in interest rates, returns on marketable securities, commodity prices and volumes, and counterparty credit. Fluctuations in interest rates can affect earnings and cash flows. We enter into interest rate swaps and financing transactions to manage changes in interest rates. Fluctuations in commodity prices and volumes and counterparty credit losses may temporarily affect cash flows, but are not expected to affect earnings due to expected recovery through regulatory mechanisms.
See Forward-Looking Information for additional information.
Risk Management Committee
We have a Risk Management Committee responsible for the oversight of commodity price risk and credit risk related to the wholesale energy marketing and power procurement activities of TEP. Our Risk Management Committee, which would be materialmeets on a quarterly basis and as needed, consists of officers from the finance, accounting, legal, wholesale marketing, and generation operations departments of TEP. To limit TEP’s exposure to our financial statements. See Note 3.commodity price risk, the Risk Management Committee sets trading and hedging policies and limits, which are reviewed frequently to respond to constantly changing market conditions. To limit TEP’s exposure to credit risk, the Risk Management Committee reviews counterparty credit exposure as well as credit policies and limits.
Accounting for Asset Retirement Obligations
We are required to record the fair value of a liability for a legal obligation to retire a long-lived tangible asset in the period in which the liability is incurred. This includes obligations resulting from conditional future events. We incur legal obligations as a result of environmental regulations imposed by State and other governmental regulations,Federal regulators, contractual agreements and other factors. To estimate the liability, management must use significant judgment and assumptions in: determining whether a legal obligation exists to remove assets; estimating the probability of a future event for a conditional obligation; estimating the fair value of the cost of removal; estimating when final removal will occur; and estimating the credit-adjusted risk-free interest rates to be used to discount the future liabilities. Changes that may arise over time with regard to these assumptions and determinations will change amounts recorded in the future as expense for asset retirement obligations. Beginning July 1, 2013, TEP began deferringdefers costs associated with the majority of its legal AROs as regulatory assets because newthese costs are included in depreciation rates approved infor recovery by the 2013 TEP Rate Order include these costs.ACC. Deferred costs are amortized over the life of the underlying asset.
A liability for the fair value of a legal asset retirement obligation (ARO) is recognized in the period in which it is incurred if it can be reasonably estimated, with the offsetting associated asset retirement costs capitalized as a part of the carrying amount of the long-lived assets. The asset retirement cost is subsequently charged to depreciation expense over the useful life of the asset or lease term. Upon retirement of the asset, we will either settle the obligation for its recorded amount or incur a gain or loss if the actual costs differ from the recorded amount.
TEP identified legal obligations to retire generation plant assets specified in land leases for its jointly-owned Navajo and Four Corners Generating Stations. The land on which these stations reside is leased from the Navajo Nation. The provisions of the leases require the lessees to remove the facilities upon request of the Navajo Nation at the expiration of the leases. Additionally, TEP and UNS Electric entered into ground lease agreements with certain land owners for the installation of photovoltaic (PV) assets. The provisions of the PV ground leases require TEP or UNS Electric to remove the PV facilities upon expiration of the leases. TEP's ARO related to the PV assets is estimated to be approximately $9 million at the retirement dates, and UNS Electric's ARO is estimated to be approximately $3 million. TEP also has certain environmental obligations at the Luna, San Juan, Sundt and Springerville Generating Stations. TEP estimates that its share of the AROs to remove the Navajo and Four Corners facilities and settle the Luna, San Juan, Sundt, Gila River and Springerville environmental obligations will be approximately $166$157 million at the retirement dates. Additionally, TEP entered into ground lease agreements with certain land owners for the installation of photovoltaic (PV) assets. The provisions of the PV ground leases require TEP to remove the PV facilities upon expiration of the leases. TEP's ARO related to the PV assets is estimated to be approximately $30 million at the retirement dates. No other legal obligations to retire generation plant assets were identified.
TEP UNS Electric and UNS Gas havehas various transmission and distribution lines that operate under leases and rights-of-way that contain end dates and may contain site restoration clauses. TEP UNS Electric and UNS Gas operateoperates transmission and distribution lines as if they will be operated in perpetuity and would continue to be used or sold without land remediation. As such, there are no AROs for these assets.

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The total net present value of TEP's ARO liability was $22$32 million at December 31, 2013. The net present value of UNS Electric's ARO liability was $1 million at December 31, 2013.2015. ARO liabilities are reported in Deferred CreditsRegulatory and Other Liabilities—Other on the balance sheets. UNS Gas has not identified any AROs associated with removal of its long-lived assets.Consolidated Balance Sheets. See Note 5.3 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information regarding AROs.
Additionally, the authorized depreciation rates for TEP UNS Electric and UNS Gas include a component designed to accrue the future costs of retiring assets for which no legal obligations exist. The accumulated balances at December 31, 2013 representing2015 represent non-legal asset retirement obligation accruals, less actual removal costs incurred, net of salvage proceeds realized, and are included in Deferred CreditsRegulatory and Other Liabilities, Regulatory Liabilities – Noncurrent on the balance sheets.Consolidated Balance Sheets. See Note 3.2 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K for additional information.
Pension and Other Retiree Benefit Plan Assumptions
TEP UNS Electric, and UNS Gas recordrecords plan assets, obligations, and expenses related to pension and other retiree benefit plans based on actuarial valuations, which include key assumptions on discount rates, expected returns on plan assets, compensation increases, and health care cost trend rates. These actuarial assumptions are reviewed annually and modified as appropriate. The effect of modifications is generally recorded or amortized over future periods. We believe that the assumptions used in recording obligations are reasonable based on prior experience, market conditions, and the advice of plan actuaries. Note 108 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K discusses the rate of return and discount rateassumptions used in the calculation of pension plan and other retiree plan obligations for TEP, UNS Electric, and UNS Gas.obligations.
TEP is required to recognize the underfunded status of its defined benefit pension and other retiree plans as a liability. The underfunded status is the difference between the fair value of the plans assets and the projected benefit obligation for pension plans or accumulated retiree benefit obligation for other retiree benefit plans. As the funded status, discount rates, and actuarial facts change, the liability will vary significantly in future years. TEP records the underfunded amount for its pension and other retiree obligations as a liability and a regulatory asset to reflect expected recovery of pension and other retiree obligations through the rates charged to retail customers.
At December 31, 2013,2015, TEP discounted its future pension plan obligations at rates between 5.0%4.5% and 5.1%4.6% and its other retiree plan obligations at a rate of 4.7%4.2%. The discount rate for future pension plan and other retiree plan obligations is determined annually based on the rates currently available on high-quality, non-callable, long-term bonds. The discount rate is based on a corporate yield curve using an average yield between the 60th and 90th percentile of AA-graded U.S. corporate bonds with future cash flows that match the timing and amount of expected future benefit payments. For TEP’s pension plans, a 25-basis point change in the discount rate would increase or decrease the Projected Benefit Obligation (PBO) by approximately $10 $15

35



million and the plan expense by $1 million. For TEP’s other retiree benefit plan, a 25-basis point change in the discount rate would increase or decrease the Accumulated Postretirement Benefit Obligation (APBO) by approximately $2 million. A 25-basis point change in the
We measured service and interest costs utilizing a single weighted-average discount rate wouldderived from the yield curve used to measure the plan obligations. As discussed in Note 8 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K, at the end of 2015, we changed our approach to determine the service and interest cost components of pension and other postretirement benefit expense for future years. For 2016, we elected to measure service and interest costs by applying the specific spot rates along that yield curve to the plan's liability cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans' liability cash flows to the corresponding spot rates on the yield curve. The use of this approach reduces 2016 service and interest cost by $4 million with a corresponding increase to regulatory assets. This change does not significantly impactaffect the measurement of our plan expense.obligations nor the funded status of our plans.
TEP calculates the market-related value of pension plan assets using the fair value of the assets on the measurement date. TEP assumed that its pension plans’ assets would generate a long-term rate of return of 7% at December 31, 2013.2015. In establishing its assumption as to the expected return on assets, TEP reviews the asset allocation and develops return assumptions for each asset class based on advice from an investment consultant and the pension’s actuary that includes both historical performance analysis and forward-looking views of the financial markets. Pension expense decreases as the expected rate of return on assets increases. A 25-basis point change in the expected return on assets would impact pension expense in 20142015 by $1 million.
TEP adopted the RP-2014 mortality table projected with improvement scale MP-2015 with 15 year convergence and 0.75% long term rate to measure December 31, 2015 pension obligations, whereas RP-2000 mortality table with Scale BB was utilized for the December 31, 2014 measurement.
TEP used a current year health care cost trend rate of 6.7%7.6% in valuing its retiree benefit obligation at December 31, 2013.2015. This rate reflects both market conditions and historical experience. Assumed health care cost trend rates have a significant effect on the amounts reported for health care plans. A one-percentage point change in assumed health care cost trend rates would changeincrease the retiree benefit obligation by approximately $6 million and decrease the retiree benefit obligation by approximately $5 million andmillion. In addition, a one-percentage point change in assumed health care cost trend rates would change the related 2016 plan expense in 2014 by approximately $1 million.
In 2014,2016, TEP will incur pension costs of approximately $8$11 million and other retiree benefit costs of approximately $6$5 million. TEP expects to charge approximately $10$13 million of these costs to O&M expense, and $3 million to capital, and $1 million to Other Expense.capital. TEP expects to make pension plan contributions of $9$10 million in 2014.2016. In 2009, TEP established a VEBA trust to fund its other retiree benefit plan. In 2014,2016, TEP expects to make benefit payments to retirees under the retiree benefit plan of approximately $5 million and contributions to the VEBA trust of approximately $1 million, net of distributions.
UNS Electric and UNS Gas discounted their future pension plan obligations using a rate of 5.2% at December 31, 2013. For UNS Electric and UNS Gas' pension plan, a 25-basis point change in the discount rate would impact the benefit obligation and pension expense by less than $1 million. UNS Electric and UNS Gas will record pension expense of $2 million in 2014, of which less than $1 million will be capitalized. UNS Electric and UNS Gas expect to make combined pension plan contributions of $1 million in 2014.

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UNS Electric and UNS Gas discounted their other retiree plan obligations using a rate of 4.7% at December 31, 2013. UNS Electric and UNS Gas will record retiree medical benefit expense and make benefit payments to retirees under the retiree benefit plan of less than $0.5 million in 2014.
Accounting for Derivative Instruments and Hedging Activities
Commodity Derivative Contracts
TEP UNS Electric, and UNS Gas enterenters into forward contracts to purchase or sell capacity or energy at contract prices over a given period of time, typically for one month, three months, or one year, within established limits to meet forecasted load requirements or to take advantage of favorable market opportunities. In general, TEP enters into forward purchase contracts when market conditions provide the opportunity to purchase energy for its load at prices that are below the marginal cost of its supply resources or to supplement its own resources (e.g., during plant outages and summer peaking periods). TEP enters into forward sales contracts when it forecasts that it haswill have excess supply and the market price of energy exceeds its marginal cost. TEP and UNS Gas enterenters into forward gas commodity price swap agreements to lock in fixed prices on a portion of forecasted gas purchases. UNS Electric enters into forward gas commodity price swap agreementspurchases and to hedge the price risk associated with forward power purchase agreementsPPAs that are indexed to natural gas prices.
For all commodity derivative instruments that do not meet the normal purchase or normal sale scope exception, we recognize derivative instruments as either assets or liabilities on the consolidated balance sheetsConsolidated Balance Sheets and measure those instruments at fair value. Unrealized gains and losses on commodity derivative contracts entered into for retail customer load are recorded as either a regulatory asset or regulatory liability on the balance sheets of TEP, UNS Electric, and UNS Gassheet based on our ability to recover the prudent costs of hedging activities entered into to mitigate energy price risk for retail customers. There are no current or expected proposals or changes in the regulatory environment that impact the probability of future recovery of these assets through the PPFAC or PGA mechanisms.mechanism.
The market prices used to determine fair values for TEP’s UNS Electric’s, and UNS Gas' derivative instruments at December 31, 2013,2015, are estimated based on various factors including broker quotes, exchange prices, over the counter prices, and time value.

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TEP UNS Electric, and UNS Gas managemanages the risk of counterparty default by performing financial credit reviews, setting limits, monitoring exposures, requiring collateral when needed, and using a standardized agreement, which allows for the netting of current period exposures to and from a single counterparty.
Interest Rate Swaps
TEP hedges the cash flow risk associated with unfavorable changes in the variable interest rates tied to LIBOR on the Springerville Common Facilities Lease. As of December 31, 2013,2015, approximately $25$29 million of variable rate lease debt for the Springerville Common Facilities Lease had been hedged through an interest rate swap agreement through July 1, 2014, and $34 million had been hedged through January 2, 2020. In August 2009, TEP entered into a swap that had the effect of converting $50 million of variable-rate IDBs to a fixed rate from September 2009 through September 2014.
In August 2011, UNS Electric entered into an interest rate swap with the effect of converting the variable interest rate for their $30 million term loan to a fixed rate from August 2011 through August 2015. See Note 6.
Commodity Cash Flow Hedge
TEP hedges the cash flow risk associated with a six-year power wholesale supply agreement using a six-year power purchase swap agreement. Unrealized gains and losses are recorded in AOCI. See Item 7A. Quantitative and Qualitative Disclosures about Market Risk, Commodity Price Risk and Note 1.
Revenue Recognition
TEP’s UNS Electric’s, and UNS Gas' retail revenues, which are recognized in the period that electricity or energy is delivered and consumed by customers, include unbilled revenue based on an estimate of kWh/thermskWh delivered at the end of each period. Unbilled revenues are dependent upon a number of factors that require management’s judgment including estimates of retail sales and customer usage patterns. The unbilled revenue is estimated by comparing the estimated kWh/thermskWh delivered to the kWh/thermskWh billed to our retail customers. The excess of estimated kWh/thermskWh delivered over kWh/thermskWh billed is then allocated to the retail customer classes based on estimated usage by each customer class. We then record revenue for each customer class based on the various Retail Rates for each customer class. Due to the seasonal fluctuations of TEP and UNS Electric’sTEP’s actual load, the unbilled revenue amount increases during the spring and summer and decreases during the fall and

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winter. Conversely the unbilled revenue amount for UNS Gas sales increases during the fall and winter and decreases during the spring and summer. A provision for uncollectible accounts, associated with retail revenues, is recorded as a component of O&M expense.
Plant Asset Depreciable Lives
TEP UNS Electric, and UNS Gas havehas significant investments in electric generation assets and electric and natural gas transmission and distribution assets. We calculate depreciation expense based on our estimate of the useful lives of our plant assets and expected net removal costs. The useful lives of plant assets are further detailed in Note 5.3 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K. Changes to depreciation estimates resulting from a change of estimated service life or removal costs could have a significant impact on the amount of depreciation expense recorded in the income statements.statement. The ACC approves depreciation rates for all generation and distribution assets. Depreciation rates for such assets cannot be changed without ACCthe ACC's approval. TEP and UNS ElectricTEP's transmission assets are subject to the jurisdiction of the FERC. See Note 1.
1 of Notes to Consolidated Financial Statements The 2013 TEP Rate Order approved a change in authorized depreciation rates for generation and distribution plant from an averageItem 8 of 3.32%this Form 10-K to 3.00% , effective July 1, 2013. The change infor additional information regarding depreciation rates will have the effect of reducing depreciation expense by approximately $11 million annually.  The reduction in depreciation expense is primarily due to revised estimates of removal costs, net of estimated salvage value for interim and final retirements. See rates.Note 3.
In January 2010, TEP obtained an updated depreciation study which indicated that its transmission assets’ depreciable lives should be extended. As a result, TEP adopted new FERC approved transmission depreciation rates effective January 2010.
Income Taxes
Due to the differences between GAAP and income tax laws, many transactions are treated differently for income tax purposes than they are in the financial statements. We account for this difference by recording deferred income tax assets and liabilities using the effective income tax rate at our balance sheet date.
Consolidated income Income tax liabilities are allocated to subsidiariesTEP based on theirTEP's taxable income and deductions as reported in the FortisUS, Inc. consolidated tax return.
A valuation allowance is established against deferred tax assets for which management believes it is more likely than not that the deferred asset will not be realized. In making this judgment, management evaluates all available evidence and gives more weight to objective verifiable evidence. At December 31, 2013, UNS Energy2015, TEP had a $7$4 million valuation allowance. The valuation allowances relatedSee Note 12 of Notes to unregulated investments’ losses are treated as capital lossesConsolidated Financial Statements in Item 8 of this Form 10-K for income tax purposes. If UNS Energy incurs additional capital losses in the future, a valuation allowance will be recorded against the deferred tax asset unless management can identify future capital gains to offset the losses. See Note 9.information.


RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
The FASB issued guidance for the recognition, measurement, and disclosureFor a discussion of certain obligations resulting from joint and several liability arrangements for which the total amountnew accounting pronouncements affecting TEP, refer to Note 13 of the obligation is fixed at the reporting date. On adoption, an entity would recognize and discloseNotes to Consolidated Financial Statements in the financial statements its obligation from a joint and several liability arrangement as the sum of the amount the entity agreed with its co-obligors that it will pay, and any additional amount the entity expects to pay on behalf of its co-obligors. This guidance will be effective in the first quarter of 2014. We do not expect the adoptionItem 8 of this guidance to have a material impact on our financial condition, results of operations, or cash flows.Form 10-K.
The FASB issued guidance which permits an entity to designate the Federal Funds Rate (the interest rate at which depository institutions lend balances to each other overnight) as a benchmark interest rate for fair value and cash flow hedges. Prior to this guidance, only interest rates on direct treasury obligations of the U.S. Government and the LIBOR were considered benchmark interest rates in the U.S. This guidance is effective immediately, and can be applied prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. We have not entered into any new cash flow or fair value hedges since the effective date of this guidance. We do not expect this guidance to have a material impact on our financial condition, results of operations, or cash flows.

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The FASB issued new guidance on the financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. We will be required to comply with the guidance on a prospective basis beginning in the first quarter of 2014. Although adoption of this new guidance may impact how such items are classified on our balance sheets, we do not expect such changes to be material. In addition, we do not expect any material changes in the presentations of our other financial statements.


SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS
This Annual Report on Form 10-K contains forward-looking statements as defined by the Private Securities Litigation Reform Act of 1995. UNS Energy and TEP are including the following cautionary statements to make applicable and take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 for any forward-looking statements made by or for UNS Energy or TEP in this Annual Report on Form 10-K. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements that are not statements of historical facts. Forward-looking statements may be identified by the use of words such as “anticipates”, “estimates”, “expects”, “intends”, “plans”, “predicts”, “projects”, and similar expressions. From time to time, we may publish or otherwise make available forward-looking statements of this nature. All such forward-looking statements, whether written or oral, and whether made by or on behalf of UNS Energy or TEP, are expressly qualified by these cautionary statements and any other cautionary statements which may accompany the forward-looking statements. In addition, UNS Energy and TEP disclaim any obligation to update any forward-looking statements to reflect events or circumstances after the date of this report.
Forward-looking statements involve risks and uncertainties that could cause actual results or outcomes to differ materially from those expressed in the forward-looking statements. We express our expectations, beliefs, and projections in good faith and believe them to have a reasonable basis. However, we make no assurances that management’s expectations, beliefs, or projections will be achieved or accomplished. We have identified the following important factors that could cause actual results to differ materially from those discussed in our forward-looking statements. These may be in addition to other factors and matters discussed in Item 1A. Risk Factors, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, and other parts of this report: state and federal regulatory and legislative decisions and actions; regional economic and market conditions which could affect customer growth and energy usage; weather variations affecting energy usage; the cost of debt and equity capital and access to capital markets; the performance of the stock market and changing interest rate environment, which affect the value of our pension and other retiree benefit plan assets and the related contribution requirements and expense; unexpected increases in O&M expense; resolution of pending litigation matters; changes in accounting standards; changes in critical accounting estimates; the ongoing restructuring of the electric industry; changes to long-term contracts; the cost of fuel and power supplies; cyber attacks or challenges to our information security; and the performance of TEP’s generating plants.


ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
Market Risks
We are exposed to various forms ofTEP’s primary market risk. Changesrisks include fluctuations in interest rates, returns on marketable securities, commodity prices and volumes, and counterparty credit. Fluctuations in interest rates can affect earnings and cash flows. We enter into interest rate swaps and financing transactions to manage changes in interest rates. Fluctuations in commodity prices and volumes and counterparty credit losses may temporarily affect our future financial results.cash flows, but are not expected to affect earnings due to expected recovery through regulatory mechanisms.
See Safe HarborForward-Looking Information for Forward-Looking Statements.additional information.
Risk Management Committee
We have a Risk Management Committee responsible for the oversight of commodity price risk and credit risk related to the wholesale energy marketing activities of TEP and the fuel and power procurement activities at TEP, UNS Electric, and UNS Gas.of TEP. Our Risk Management Committee, which meets on a quarterly basis and as needed, consists of officers from the finance, accounting, legal, wholesale marketing, transmission and distribution operations, and generation operations departments of UNS Energy.TEP. To limit TEP, UNS Electric, and UNS Gas’sTEP’s exposure to commodity price risk, the Risk Management Committee sets trading and hedging policies and limits, which are reviewed frequently to respond to constantly changing market conditions. To limit TEP, UNS Electric, and UNS Gas’sTEP’s exposure to credit risk, the Risk Management Committee reviews counterparty credit exposure as well as credit policies and limits.

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Interest Rate Risk
Long-Term Debt
TEP is exposed to interest rate risk resulting from changes in interest rates on certain of its variable rate debt obligations. TEP had $215$137 million at December 31, 2013 in tax-exempt variable rate debt outstanding.outstanding at December 31, 2015. The outstanding debt included one series of bonds for which interest rates on TEP’s tax-exempt variable rate debt are reset weekly orand one series of bonds for which interest rates are reset monthly. The weighted average weekly rate on TEP's weekly variable rate debt (excluding letter of credit(including LOC fees and remarketing fees) was 0.12%1.24% in 20132015 and 0.17%1.46% in 2012.2014. The average weekly interest rate ranged from 0.06%0.93% - 1.42% in 2015 and 1.40% - 1.75% in 2014. The monthly rate is based on a percentage of an index equal to 0.48%one-month LIBOR plus a credit spread. The average monthly rate was 0.81% in 20132015 and 0.06% to 0.26% during 2012. 0.87% in 2014. The monthly rate ranged from 0.79% - 0.87% in 2015 and 0.85% - 0.95% in 2014.
Although short-term interest rates have been relativelywere low and stable in 20132015 and 2012,2014, TEP may still be subject to volatility in its tax-exempt variable rate debt. A 100 basis point increase in average interest rates on this debt, over a twelve month period, would result in a decrease in TEP’s pre-tax net income of approximately $2$1 million.
TEP managescan manage its exposure to variable interest rate risk by entering into interest rate swaps and financing transactions to rebalance its mix of variable rate and fixed rate long-term debt.
TEP has fixed-for-floating interest rate swaps in place to hedge floating rate interest rate risk associated with $55 million of Springerville Common Facilities lease debt and $50 million of its variable rate IDBs.
In 2011, UNS Electric entered into a fixed-for-floating interest rate swap in which UNS Electric will pay a fixed rate of 0.97% and receive a three-month LIBOR rate on a $30 million notional amount through August 2015place to hedge thefloating interest rate risk associated with a portion of its $30Springerville Common Facilities lease debt. The notional amount of the swap is $29 million credit agreement.at December 31, 2015. The notional amount of lease debt that was unhedged as of December 31, 2015 was $13 million. TEP did not have any other interest rate swaps at December 31, 2015.
Interest Rate SwapsSwap
To adjust the value of TEP’s interest rate swaps,swap, classified as a cash flow hedges,hedge, to fair value in Other Comprehensive Income (Loss), TEP recorded the following net unrealized gains (losses):gains:
 2013 2012 2011
 Millions of Dollars
Unrealized Gains (Losses)$(1) $(2) $(5)
(in millions)2015 2014 2013
Net Unrealized Gains$1
 $2
 $4
Revolving Credit Facilities
UNS Energy, TEP UNS Electric, and UNS Gas are alsois subject to interest rate risk resulting from changes in interest rates on their borrowings under revolvingits credit facilities.agreements. The interest paid on borrowings is variable. Revolving credit borrowings may be made on the basis of a spread over LIBOR or an Alternate Base Rate. As a result, UNS Energy, TEP UNS Electric, and UNS Gas may experience significant volatility in the rates paid on LIBOR borrowings under theirits revolving credit facilities.
Marketable Securities Risk

UNS Energy has a short-term investment policy which governs
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The majority of TEP’s pension plan assets, as well as assets associated with other employee benefit obligations, are investments in equity and debt securities. These investments are exposed to price fluctuations in equity markets and changes in interest rates. Of the investmentassets held for employee benefit obligations, the pension plan assets comprise the largest portion. The pension plan assets will help fund defined retirement benefits for substantially all of excess cash balances by UNS Energy and its subsidiaries. We review this policy periodically in response to market conditions to adjust, if necessary, the maturities and concentrations by investment type and issuerour employees. Declines in the investment portfolio. At December 31, 2013, UNS Energy’s short-term investments consistedvalues of liquid, highly-rated money market funds and certificatesthese assets could increase required employer contributions, which would adversely affect cash flows. Declines in values could also increase the reported pension expense, adversely affecting TEP’s results of deposit. These short-term investments are classified as Cash and Cash Equivalents on the balance sheet.
TEP had marketable securities comprised of investments in lease equity with an estimated fair value of $25 million at December 31, 2013, and $32 million of lease debt and equity at December 31, 2012. At December 31, 2013, the carrying value exceeded fair value by $11 million. No impairment was recorded as TEP expects to recover the full carrying value of its lease equity investment in future rates charged to retail customers. At December 31, 2012, the carrying value exceeded the fair value by $13 million. These securities represent TEP’s investments in lease debt and equity underlying certain of TEP’s capital lease obligations. Changes in the fair value of such debt securities do not present a material risk to TEP, as TEP intends to hold these investments to maturity.operations.
Commodity Price Risk
TEP
TEP is exposed to commodity price risk primarily relating to changes in the market price of electricity, natural gas, and coal. This risk is mitigated through hedging practices and a PPFAC mechanism which fully recovers the actual retail fuel and purchased power costs incurred on a timely basis from TEP’s retail customers. The PPFAC mechanism has a forward component and a true-up component. The forward component of the PPFAC rate is based on forecasted fuel and purchased

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power costs. The true-up component reconciles actual fuel and purchased power costs with the amounts collected in the prior year and any amounts under/over-collected will be collected from/credited to customers. If the actual price of power is higher than the forecasted PPFAC rate, TEP's operating cash flows are reduced by the price difference until the subsequent 12-month period when the true-up component is adjusted to allow the recovery of this difference.
Purchases and Sales of Energy
To manage its exposure to energy price risk, TEP enters into forward contracts to buy or sell energy at a specified price and future delivery period. Generally, TEP commits to future sales based on expected excess generating capability, forward prices and generation costs, using a diversified market approach to provide a balance between long-term, mid-term, and spot energy sales. TEP generally enters into forward purchases during its summer peaking period to ensure it can meet its load and reserve requirements, and account for other contracts and resource contingencies. TEP also enters into limited forward purchases and sales to optimize its resource portfolio and take advantage of geographical differences in price. These positions are managed on both a volumetric and dollar basis and are closely monitored using risk management policies and procedures overseen by the Risk Management Committee. For example, the risk management policies provide that TEP should not take a short physical position in the third quarter and must have owned generation backing up all physical forward sales positions at the time the sale is made. TEP’s risk management policies also place limits on the duration of transactions in both gas and power.
TEP enters into some forward contracts considered to be normal purchases and sales of electric energy and are therefore not accounted for as derivatives. TEP records revenues on its “normal sales” and expenses on its “normal purchases” in the period in which the energy is delivered. TEP also enters into forward contracts that are not considered to be “normal purchases and sales” and therefore are accounted for as derivatives. When TEP has derivative forward contracts, it marks them to market using actively quoted prices obtained from brokers for power traded over-the-counter at Palo Verde and at other Southwesternsouthwestern U.S. trading hubs. TEP believes that these broker quotations used to calculate the mark-to-market values represent accurate measures of the fair values of TEP’s positions because of the short-term nature of TEP’s positions, as limited by risk management policies, and the liquidity in the short-term market.
Long-Term Wholesale Sales
ThroughTEP has several long-term wholesale agreements for the endsale of the contractenergy. Sales under some of these agreements are based on indexed energy prices. Changes in May 2016, SRP is required to purchase 500,000 MWh of on-peak energy per year from TEP.  TEP does not receive a demand charge and the price of energy is based on a discount to the price of on-peak power on the Palo Verde Market Index. As of February 14, 2014, the average forward price of on-peak power on the Palo Verde Market Index for the calendar year 2014 was $46 per MWh.
Each $5 change in the per MWh market price of on-peak power can affect annual pre-taxTEP's revenue and income by approximately $3 million.from these agreements.
Natural Gas
TEP is also subject to commodity price risk from changes in the price of natural gas. In addition to energy from its coal-fired facilities, TEP typically uses power purchases, supplemented by generation from its gas-fired units to meet the summer peak demands of its retail customers and to meet local reliability needs. Some of these purchased power contracts are indexed to natural gas prices. Short-term and spot power purchase prices are also closely correlated to natural gas prices. Due to its increasing gas and purchased power usage, TEP hedges a portion of its total natural gas exposure from plant fuel, gas-indexed power purchases, and spot market purchases with various instruments up to 3three years in advance. TEP purchases its remaining gas fuel and power needs in the spot and short-term markets.
As required by fair value accounting rules, for the year ended December 31, 2013,2015, TEP considered the impact of non-performance risk in the measurement of fair value of its derivative assets and derivative liabilities net of collateral posted.

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To adjust the value of its commodity derivatives to fair value, inTEP adjusted regulatory assets or regulatory liabilities TEP recorded the following net unrealized gains (losses):as follows:
 2013 2012 2011
 Millions of Dollars
Unrealized Gains (Losses)$
 $6
 $(2)
(in millions)2015 2014 2013
Unrealized Net Gain (Loss) Recorded to Regulatory (Assets) Liabilities$6
 $(18) $

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The charttable below displays the valuation methodologies and maturities of TEP’s power and gas derivative contracts.contracts by source of fair value:
Unrealized Gain (Loss) of TEP’s
Hedging Activities
Millions of Dollars
Unrealized Gain (Loss) of TEP’s Hedging Activities
Source of Fair Value at Dec. 31, 2013
Maturity 0 – 6
months
 
Maturity 6 – 12
months
 
Maturity
over 1 yr.
 
Total
Unrealized
Gain (Loss)
Maturity 0 – 6
months
 
Maturity 6 – 12
months
 
Maturity
over 1 yr.
 
Total
Unrealized
Gain (Loss)
(in millions)December 31, 2015
Prices Actively Quoted$(1) $1
 $1
 $1
$(7) $(1) $(2) $(10)
Prices Based on Models and Other Valuation Methods(1) (1) 
 (2)(1) 
 
 (1)
Total$(2) $
 $1
 $(1)$(8) $(1) $(2) $(11)
Sensitivity Analysis of Derivatives
TEP uses sensitivity analysis to measure the impact of favorable and unfavorable changes in market prices on the fair value of its derivative forward contracts. TEP records unrealized gains and losses as either a regulatory asset or regulatory liability. As contracts settle, the unrealized gains and losses are reversed and realized gains or losses are recorded to the PPFAC. For TEP's non-cash flow power hedges, a 10% change in the market price of power would affect unrealized net lossespositions reported as a regulatory asset or regulatory liability by approximately $1 million; for gas swaps and collarscollar contracts, a 10% change in the market price of energy would affect unrealized net gainspositions reported as a regulatory asset or liability by approximately $3 million.
Coal
TEP is subject to commodity price risk from changes in the price of coal used to fuel its coal-fired generating plants. This risk is mitigated through a PPFAC mechanism which allows for the recoveryuse of costs from retail customers.long term coal supply agreements with limited price volatility.
TEP's coal supply contract for Springerville Units 1 and 2 expires in 2020.2020, at which time a new coal purchase agreement will be negotiated. TEP expects coal reserves from the Lee Ranch - El Segundo mine, which supplies Springerville Units 1 and 2 to be sufficient to supply the estimated requirements for Units 1 and 2 for theirthe units presently estimated remaining lives. The current coal price is determined by the cost of Powder River Basin coal delivered to Springerville Unit 3 subject to a floor and ceiling.
TEP does not have a long-term coal supply contract for Sundt Unit 4. TEP purchases coal for Sundt Unit 4 on the spot market and can supply that unit with natural gas when the price is competitive with coal. Coal burned at Sundt Unit 4 represents less than 10% of TEP’s total coal consumption.
TEP also participates in jointly-owned generating facilities at Four Corners, Navajo, and San Juan, where coal supplies are received under long-term contracts administered by the operating agents. The coal contracts at Four Corners and Navajo expire in 2031 and 2019, respectively. The new coal supply contract with Westmoreland for San Juan, effective January 31, 2016, expires in 2022. At December 31, 2015, TEP expects coal reserves available to these three jointly-owned generating facilities to be sufficient for the remaining lives of the stations.
Thehad contracts to purchase coal for use at the jointly-owned facilities require TEP to purchase minimum amounts of coal at anand expected its estimated average annual cost of $21 million for the next five years. three years to be $51 million and $22 million thereafter through 2031. Contemporaneous with the new San Juan coal supply contract in January 2016, additional estimated minimum purchase obligations are $21 million in 2016, $23 million in 2017, $24 million in 2018 and 2019, $23 million in 2020, and $22 million through the end of the contract.
See Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, UNS Energy Consolidated, Liquidity and Capital Resources Contractual Obligationsand Note 7.
UNS Electric
UNS Electric is exposed7 of Notes to commodity price risk from changes Consolidated Financial Statements in the priceItem 8 of this Form 10-K for electricity and natural gas. This risk is mitigated through hedging practices, and UNS Electric has a PPFAC mechanism which allows for the recovery of purchased power and fuel costs from retail customers.
The PPFAC allows UNS Electric to recover its fuel, transmission, and purchased power costs, including demand charges, broker fees, and the prudent costs of contracts for hedging fuel and purchased power costs for its retail customers.
As a result of the 2013 UNS Electric Rate Order, UNS Electric's PPFAC rate reflects a weighted, 12-month rolling average of actual fuel and purchased power costs incurred by UNS Electric. The PPFAC rate adjusts monthly, but the change in the PPFAC rate is banded, so the new monthly PPFAC rate cannot increase or decrease the total average retail purchased power and fuel rate by more than 0.83 percent from the preceding month’s rate. UNS Electric is required to file for a PPFAC rate adjustment if the PPFAC bank balance is over-collected by more than $10 million on a billed-to-customer basis. At December 31, 2013, the PPFAC bank balance was over-collected by $14 million on a billed-to-customer basis. The new PPFAC rate effective on January 1, 2014 is designed to address any over- or under-collected balances. See Note 3.
UNS Electric enters into various power supply agreements for periods of one to five years. Certain of these contracts are at a fixed price per MW and others are indexed to natural gas prices. Because of the new 12-month rolling average structure of the current PPFAC, costs are expected to be recovered on a more timely basis.

K-70


For UNS Electric’s forward power contracts, a 10% change in market prices would affect unrealized net losses reported as a regulatory asset by approximately $3 million.
UNS Electric hedges a portion of its natural gas exposure from gas-indexed purchased power agreements with fixed price contracts. In addition, UNS Electric hedges a portion of its anticipated natural gas exposure from plant fuel. UNS Electric will satisfy its remaining gas and purchased power needs through a combination of purchases in the short-term and spot markets.
As required by fair value accounting rules, for the year ended December 31, 2013, UNS Electric considered the impact of non-performance risk in the measurement of fair value of its derivative assets and derivative liabilities net of collateral posted.
additional informationTo adjust the value of its commodity derivatives to fair value in regulatory assets or regulatory liabilities, UNS Electric recorded the following net unrealized gains (losses):.
 2013 2012 2011
 Millions of Dollars
Unrealized Gains (Losses)$5
 $9
 $(1)
For UNS Electric’s forward gas contracts, a 10% increase in market prices would result in an increase in unrealized net gains reported as a regulatory liability by approximately $5 million. A 10% decrease in market prices would result in a decrease in unrealized net gains reported as a regulatory liability by approximately $4 million.
UNS Gas
UNS Gas is subject to commodity price risk, primarily from the changes in the price of natural gas purchased for its customers. This risk is mitigated through the PGA mechanism which provides an adjustment to UNS Gas’ Retail Rates to recover the prudently incurred actual costs of gas and transportation. UNS Gas further reduces this risk by purchasing forward fixed price contracts or entering into financial gas swaps for a portion of its projected gas needs under its Price Stabilization Plan.
As required by fair value accounting rules, for the year ended December 31, 2013, UNS Gas considered the impact of non-performance risk in the measurement of fair value of its derivative assets and derivative liabilities net of collateral posted.
To adjust the value of its commodity derivatives to fair value in regulatory assets or regulatory liabilities, UNS Gas recorded the following net unrealized gains:
 2013 2012 2011
 Millions of Dollars
Unrealized Gains$4
 $6
 $1
For UNS Gas’ forward gas contracts, a 10% change in market prices would affect unrealized net gains reported as a regulatory liability by approximately $2 million.
Credit Risk
UNS EnergyTEP is exposed to credit risk in its energy-related marketing activities related to potential non-performance by counterparties. We manage the risk of counterparty default by performing financial credit reviews, setting limits, monitoring exposures, requiring collateral when needed, and using standard agreements which allow for the netting of current period exposures to and from a single counterparty. We calculate counterparty credit exposure by adding any outstanding receivable (net of amounts payable if a netting agreement exists) to the mark-to-market value of any forward contracts. A positive value means that we are exposed to the creditworthiness of our counterparties. If exposure exceeds credit limits or contractual collateral thresholds, we may request that a counterparty provide credit enhancement in the form of cash collateral or a letter of credit. Conversely, a negative value means that a counterparty is exposed to the creditworthiness of TEP, UNS Gas, or UNS Electric. If such exposure exceeds credit limits or collateral thresholds, we may be required to post collateral in the form of cash or LOCs.an LOC.
TEP UNS Electric, and UNS Gas each havehas entered into short-term and long-term transactions with several financial institution counterparties with terms of one month through fivethree years. As of December 31, 2013,2015, the combined credit exposure to TEP UNS Electric, and UNS Gas from financial institution counterparties was approximately $3less than $1 million.

40




As of December 31, 2013,2015, TEP’s total credit exposure related to its wholesale marketing and gas hedging activities was approximately $15$10 million. TEP had one non-investment grade counterparty with exposure of greater than 10% of its total credit exposure, totaling approximately $3 million. TEP’s totaldid not have any exposure to non-investment grade counterparties was $3 million.counterparties.

K-71


At December 31, 2013,2015, TEP posted no cash collateral and less than $1 million in LOCs as credit enhancements with its counterparties, and did not hold any collateral from its counterparties.
UNS Gas is subject to credit risk from non-performance by its supply and hedging counterparties to the extent that these contracts have a mark-to-market value in favor of UNS Gas. As of December 31, 2013, UNS Gas had purchased under fixed price contracts approximately 30% of its expected consumption for the 2014/2015 winter season. At December 31, 2013, UNS Gas had no mark-to-market credit exposure under its supply and hedging contracts. As of December 31, 2013 UNS Gas had posted no cash collateral and no LOCs as credit enhancements with its counterparties, and did not hold any collateral from counterparties.
UNS Electric enters into energy purchase agreements as well as gas hedging contracts to hedge the risk in its gas-indexed power purchase agreements. To the extent that such contracts have a positive mark-to-market value, UNS Electric is exposed to credit risk under those contracts. At December 31, 2013, UNS Electric had less than $1 million in credit exposure under such contracts. As of December 31, 2013, UNS Electric had posted less than $1 million in LOCs and no cash collateral as credit enhancements with its counterparties, and had not collected any collateral margin from its counterparties.


41




ITEM 8. CONSOLIDATED FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
UNS Energy—Management’s Report on Internal Controls Over Financial Reporting
UNS Energy’s management is responsible for establishing and maintaining adequate internal control over financial reporting. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Management assessed the effectiveness of UNS Energy’s internal control over financial reporting as of December 31, 2013. In making this assessment, management used the criteria set forth by the 1992 Committee of Sponsoring Organizations of the Treadway Commission (COSO) Internal Control – Integrated Framework.
Based on management’s assessment using those criteria management has concluded that, as of December 31, 2013, UNS Energy’s internal control over financial reporting was effective.

The effectiveness of UNS Energy’s internal control over financial reporting as of December 31, 2013, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report in Item 8 of this Annual Report on Form 10-K.
Tucson Electric Power Company—Management’s Report on Internal Controls Over Financial Reporting
TEP’s management is responsible for establishing and maintaining adequate internal control over financial reporting. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Management assessed the effectiveness of TEP’s internal control over financial reporting as of December 31, 2013.2015. In making this assessment, management used the criteria set forth by the 19922013 COSO Internal Control – Integrated Framework.
Based on management’s assessment using those criteria, management has concluded that, as of December 31, 2013,2015, TEP’s internal control over financial reporting was effective.


K-7242




Report of Independent Registered Public Accounting Firm

To the Board of Directors and StockholdersShareholder of Tucson Electric Power Company:
UNS Energy Corporation:
In our opinion,We have audited the accompanying consolidated financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all material respects, the financial positionbalance sheets of UNS Energy Corporation and its subsidiaries atTucson Electric Power Company as of December 31, 20132015 and December 31, 2012,2014, and the resultsrelated consolidated statements of their operationsincome, comprehensive income, changes in stockholder’s equity and their cash flows for each of the threetwo years in the period ended December 31, 2013 in conformity with accounting principles generally accepted in2015. These financial statements are the United States of America. In addition, in our opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control—Integrated Framework (1992) issued by the Committee of Sponsoring Organizationsresponsibility of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements and financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting.Company's management. Our responsibility is to express opinionsan opinion on these financial statements on the financial statement schedule, and on the Company’s internal control over financial reporting based on our integrated audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the auditsaudit to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effectivemisstatement. We were not engaged to perform an audit of the Company’s internal control over financial reporting. Our audits included consideration of internal control over financial reporting was maintainedas a basis for designing audit procedures that are appropriate in all material respects. Our auditsthe circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial statements includedreporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provideprovided a reasonable basis for our opinions.
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
February 25, 2014



K-73



Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholder of
Tucson Electric Power Company:opinion.
In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a)(1)referred to above present fairly, in all material respects, the consolidated financial position of Tucson Electric Power Company and its subsidiaries at December 31, 20132015 and December 31, 2012,2014, and the consolidated results of their operations and their cash flows for each of the threetwo years in the period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles.
/s/ Ernst & Young LLP
Ernst & Young LLP
Calgary, Canada
February 18, 2016

43


Report of Independent Registered Public Accounting Firm
To the Board of Directors and Stockholder of Tucson Electric Power Company
In our opinion, the consolidated statements of income, comprehensive income, changes in stockholder’s equity and cash flows for the year ended December 31, 2013 present fairly, in all material respects, the results of operations and cash flows of Tucson Electric Power Company and its subsidiaries for the year ended December 31, 2013, in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. These financial statements and financial statement schedule are the responsibility of the Company’sCompany's management. Our responsibility is to express an opinion on these financial statements and financial statement schedule based on our audits.audit. We conducted our auditsaudit of these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provideaudit provides a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
Phoenix, Arizona
February 25, 2014, except for the effects of the revision discussed in Note 1 (not presented herein) to the consolidated financial statements appearing under Item 8 of the Company’s 2014 annual report on Form 10-K, as to which the date is August 14, 2014



K-74



UNS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF INCOME

 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
 (Except Per Share Amounts)
Operating Revenues     
Electric Retail Sales$1,102,769
 $1,087,279
 $1,085,822
Electric Wholesale Sales135,160
 125,414
 132,346
Gas Retail Sales125,478
 123,133
 145,053
Other Revenues121,153
 125,940
 115,481
Total Operating Revenues1,484,560
 1,461,766
 1,478,702
Operating Expenses     
Fuel332,279
 327,832
 324,520
Purchased Energy252,532
 224,696
 276,610
Transmission and Other PPFAC Recoverable Costs23,012
 14,540
 7,334
Increase (Decrease) to Reflect PPFAC/PGA Recovery Treatment(16,313) 32,246
 (4,932)
Total Fuel and Purchased Energy591,510
 599,314
 603,532
Operations and Maintenance389,699
 383,689
 379,220
Depreciation149,615
 141,303
 133,832
Amortization27,557
 35,784
 30,983
Taxes Other Than Income Taxes54,683
 49,881
 49,428
Total Operating Expenses1,213,064
 1,209,971
 1,196,995
Operating Income271,496
 251,795
 281,707
Other Income (Deductions)     
Interest Income534
 1,106
 4,568
Other Income7,880
 4,928
 7,958
Other Expense(3,463) (7,723) (5,278)
Appreciation in Fair Value of Investments2,833
 1,892
 329
Total Other Income (Deductions)7,784
 203
 7,577
Interest Expense     
Long-Term Debt71,180
 71,909
 73,217
Capital Leases25,140
 33,613
 40,359
Other Interest Expense538
 1,983
 2,535
Interest Capitalized(3,483) (2,153) (3,753)
Total Interest Expense93,375
 105,352
 112,358
Income Before Income Taxes185,905
 146,646
 176,926
Income Tax Expense58,427
 55,727
 66,951
Net Income$127,478
 $90,919
 $109,975
Weighted-Average Shares of Common Stock Outstanding (000)     
Basic41,618
 40,362
 36,962
Diluted41,975
 41,755
 41,609
Earnings Per Share     
Basic$3.06
 $2.25
 $2.98
Diluted$3.04
 $2.20
 $2.75
Dividends Declared Per Share$1.74
 $1.72
 $1.68

See Notes to Consolidated Financial Statements.





UNS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
Comprehensive Income     
Net Income$127,478
 $90,919
 $109,975
Other Comprehensive Income (Loss)     
Net Changes in Fair Value of Cash Flow Hedges,
net of income tax (expense) benefit of $(1,850), $(743), and $964
2,825
 1,134
 (1,473)
SERP Benefit Amortization,
net of income tax (expense) benefit of $(572), $608, and $(804)
916
 (840) 1,158
Total Other Comprehensive Income (Loss), Net of Tax3,741
 294
 (315)
Total Comprehensive Income$131,219
 $91,213
 $109,660

See Notes to Consolidated Financial Statements.


K-7644



UNS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWS
 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
Cash Flows from Operating Activities     
Cash Receipts from Electric Retail Sales$1,208,967
 $1,197,390
 $1,163,537
Cash Receipts from Electric Wholesale Sales160,947
 149,722
 183,151
Cash Receipts from Gas Retail Sales138,775
 141,590
 159,529
Cash Receipts from Operating Springerville Units 3 & 4114,258
 107,927
 104,754
Cash Receipts from Gas Wholesale Sales3,740
 5,233
 12,404
Interest Received517
 2,947
 6,334
Income Tax Refunds Received11
 1,821
 4,672
Performance Deposits Received
 200
 7,050
Other Cash Receipts35,142
 24,105
 23,937
Fuel Costs Paid(285,812) (321,355) (277,386)
Purchased Energy Costs Paid(280,920) (250,231) (328,713)
Payment of Operations and Maintenance Costs(260,453) (291,512) (295,662)
Taxes Other Than Income Taxes Paid, Net of Amounts Capitalized(182,488) (187,257) (179,766)
Wages Paid, Net of Amounts Capitalized(131,710) (127,176) (122,370)
Interest Paid, Net of Amounts Capitalized(66,610) (69,478) (68,027)
Capital Lease Interest Paid(22,553) (28,788) (32,103)
Income Taxes Paid(316) 
 (700)
Performance Deposits Paid
 (200) (4,550)
Wholesale Gas Costs Paid
 
 (11,822)
Other Cash Payments(10,983) (6,829) (6,949)
Net Cash Flows—Operating Activities420,512
 348,109
 337,320
Cash Flows from Investing Activities     
Capital Expenditures(325,886) (307,277) (374,122)
Purchase of Intangibles—Renewable Energy Credits(26,948) (10,317) (5,992)
Return of Investments in Springerville Lease Debt9,104
 19,278
 38,353
Change in Restricted Cash4,134
 (1,445) 
Proceeds from Note Receivable
 15,000
 
Other, net5,786
 21,862
 14,673
Net Cash Flows—Investing Activities(333,810) (262,899) (327,088)
Cash Flows from Financing Activities     
Proceeds from Borrowings Under Revolving Credit Facilities139,000
 359,000
 391,000
Repayments of Borrowings Under Revolving Credit Facilities(108,000) (381,000) (351,000)
Payments of Capital Lease Obligations(99,621) (89,452) (74,381)
Common Stock Dividends Paid(72,234) (69,648) (61,904)
Proceeds from Stock Options Exercised3,831
 3,570
 8,115
Proceeds from Common Stock Issuance464
 
 
Proceeds from Issuance of Long-Term Debt
 149,513
 340,285
Repayments of Long-Term Debt
 (9,341) (252,125)
Other, net818
 (324) (1,431)
Net Cash Flows—Financing Activities(135,742) (37,682) (1,441)
Net Increase (Decrease) in Cash and Cash Equivalents(49,040) 47,528
 8,791
Cash and Cash Equivalents, Beginning of Year123,918
 76,390
 67,599
Cash and Cash Equivalents, End of Year$74,878
 $123,918
 $76,390

See Note 14 for supplemental cash flow information.

See Notes to Consolidated Financial Statements.

K-77




UNS ENERGY CORPORATION
CONSOLIDATED BALANCE SHEETS
 December 31,
 2013 2012
 Thousands of Dollars
ASSETS 
Utility Plant   
Plant in Service$5,192,122
 $5,005,768
Utility Plant Under Capital Leases637,957
 582,669
Construction Work in Progress201,959
 128,621
Total Utility Plant6,032,038
 5,717,058
Less Accumulated Depreciation and Amortization(1,982,524) (1,921,733)
Less Accumulated Amortization of Capital Lease Assets(514,677) (494,962)
Total Utility Plant—Net3,534,837
 3,300,363
Investments and Other Property   
Investments in Lease Equity36,194
 36,339
Other34,971
 36,537
Total Investments and Other Property71,165
 72,876
Current Assets   
Cash and Cash Equivalents74,878
 123,918
Accounts Receivable—Customer104,596
 93,742
Unbilled Accounts Receivable52,403
 53,568
Allowance for Doubtful Accounts(6,833) (6,545)
Materials and Supplies88,085
 93,322
Deferred Income Taxes—Current59,681
 34,260
Regulatory Assets—Current52,763
 51,619
Fuel Inventory44,317
 62,019
Derivative Instruments5,629
 3,165
Investments in Lease Debt
 9,118
Other15,354
 33,567
Total Current Assets490,873
 551,753
Regulatory and Other Assets   
Regulatory Assets—Noncurrent150,584
 191,077
Derivative Instruments1,180
 3,801
Other Assets24,430
 20,559
Total Regulatory and Other Assets176,194
 215,437
Total Assets$4,273,069
 $4,140,429
See Notes to Consolidated Financial Statements.

(Continued)

K-78




UNS ENERGY CORPORATION
CONSOLIDATED BALANCE SHEETS

 December 31,
 2013 2012
 Thousands of Dollars
CAPITALIZATION AND OTHER LIABILITIES 
Capitalization   
Common Stock Equity$1,130,784
 $1,065,465
Capital Lease Obligations149,767
 262,138
Long-Term Debt1,507,070
 1,498,442
Total Capitalization2,787,621
 2,826,045
Current Liabilities   
Current Obligations Under Capital Leases167,659
 90,583
Borrowings Under Revolving Credit Facilities22,000
 
Accounts Payable—Trade117,503
 107,740
Regulatory Liabilities—Current53,935
 43,516
Accrued Taxes Other than Income Taxes43,880
 41,939
Customer Deposits30,671
 34,048
Accrued Employee Expenses28,148
 24,094
Accrued Interest27,786
 31,950
Derivative Instruments7,534
 14,742
Other17,775
 10,517
Total Current Liabilities516,891
 399,129
Deferred Credits and Other Liabilities   
Deferred Income Taxes—Noncurrent481,662
 364,756
Regulatory Liabilities—Noncurrent302,482
 279,111
Pension and Other Retiree Benefits90,923
 159,401
Derivative Instruments7,100
 12,709
Other86,390
 99,278
Total Deferred Credits and Other Liabilities968,557
 915,255
Commitments, Contingencies, and Environmental Matters (Note 7)
 
Total Capitalization and Other Liabilities$4,273,069
 $4,140,429
See Notes to Consolidated Financial Statements.
(Concluded)


K-79



UNS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF CAPITALIZATION
      December 31,
      2013 2012
       Thousands of Dollars
COMMON STOCK EQUITY        
Common Stock-No Par Value     $889,301
 $882,138
  2013 2012    
Shares Authorized 75,000,000
 75,000,000
    
Shares Outstanding 41,538,343
 41,343,851
    
Retained Earnings     247,532
 193,117
Accumulated Other Comprehensive Loss     (6,049) (9,790)
Total Common Stock Equity     1,130,784
 1,065,465
PREFERRED STOCK        
No Par Value, 1,000,000 Shares Authorized, None Outstanding     
 
CAPITAL LEASE OBLIGATIONS        
Springerville Unit 1     192,871
 196,843
Springerville Coal Handling Facilities     27,878
 48,038
Springerville Common Facilities     96,677
 107,840
Total Capital Lease Obligations     317,426
 352,721
Less Current Maturities     (167,659) (90,583)
Total Long-Term Capital Lease Obligations     149,767
 262,138
LONG-TERM DEBT        
  Maturity Interest Rate    
UNS Energy:        
Credit Agreement 2016 Variable 54,000
 45,000
Tucson Electric Power Company:        
Variable Rate Bonds 2016 - 2032 Variable 214,802
 215,300
Fixed Rate Bonds 2020 - 2040 3.85% – 5.75% 1,008,268
 1,008,142
UNS Electric and UNS Gas:        
Senior Notes 2015 – 2026 5.39% – 7.10% 200,000
 200,000
UNS Electric:        
Term Loan 2015 Variable 30,000
 30,000
Total Long-Term Debt     1,507,070
 1,498,442
Total Capitalization     $2,787,621
 $2,826,045
See Notes to Consolidated Financial Statements.


K-80




UNS ENERGY CORPORATION
CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY
 
Common
Shares
Outstanding
 
Common
Stock
 
Retained
Earnings
 
Accumulated
Other
Comprehensive
Loss
 
Total
Stockholders’
Equity
 Thousands of Shares Thousands of Dollars
Balances at December 31, 201036,542
 $715,687
 $124,838
 $(9,769) $830,756
Net Income    109,975
   109,975
Other Comprehensive Loss, net of tax      (315) (315)
Dividends Declared    (62,158)   (62,158)
Shares Issued for Stock Options319
 8,176
     8,176
Shares Issued under Performance Share Awards57
 
     
Share-based Compensation  2,040
     2,040
Balances at December 31, 201136,918
 725,903
 172,655
 (10,084) 888,474
Net Income    90,919
   90,919
Other Comprehensive Income, net of tax      294
 294
Dividends Declared    (70,457)   (70,457)
Shares Issued on Conversion of Notes and Related Tax Effect4,262
 149,805
     149,805
Shares Issued for Stock Options133
 3,511
     3,511
Shares Issued under Performance Share Awards31
 
     
Share-based Compensation  2,919
     2,919
Balances at December 31, 201241,344
 882,138
 193,117
 (9,790) 1,065,465
Net Income    127,478
   127,478
Other Comprehensive Income, net of tax  
 
 3,741
 3,741
Dividends Declared
   (73,063) 
 (73,063)
Shares Issued under Dividend Reinvestment Plan10
 464
     464
Shares Issued for Stock Options127
 3,831
 
 
 3,831
Shares Issued under Performance Share Awards57
 
 
 
 
Share-based Compensation  2,868
     2,868
Balances at December 31, 201341,538
 $889,301
 $247,532
 $(6,049) $1,130,784

We describe limitations on our ability to pay dividends in Note 13.

See Notes to Consolidated Financial Statements.



K-81



TUCSON ELECTRIC POWER COMPANY
CONSOLIDATED STATEMENTS OF INCOME
(Amounts in thousands)
Years Ended December 31,
2013 2012 2011Year Ended December 31,
Thousands of Dollars2015 2014 2013
Operating Revenues          
Electric Retail Sales$934,357
 $915,879
 $903,930
$1,021,543
 $970,145
 $934,357
Electric Wholesale Sales132,500
 111,194
 129,861
167,020
 158,323
 132,500
Other Revenues129,833
 134,587
 122,595
117,981
 141,433
 129,833
Total Operating Revenues1,196,690
 1,161,660
 1,156,386
1,306,544
 1,269,901
 1,196,690
Operating Expenses          
Fuel325,903
 318,901
 318,268
305,559
 297,537
 325,903
Purchased Power112,452
 80,137
 105,766
124,764
 152,922
 112,452
Transmission and Other PPFAC Recoverable Costs12,233
 5,722
 (1,435)24,798
 18,179
 12,233
Increase (Decrease) to Reflect PPFAC Recovery Treatment(12,458) 31,113
 (6,165)39,787
 (11,194) (12,458)
Total Fuel and Purchased Energy438,130
 435,873
 416,434
Total Fuel and Purchased Power494,908
 457,444
 438,130
Operations and Maintenance335,321
 334,553
 330,801
345,356
 378,877
 335,321
Depreciation118,076
 110,931
 104,894
138,093
 126,520
 118,076
Amortization31,294
 39,493
 34,650
19,261
 28,567
 31,294
Taxes Other Than Income Taxes43,498
 40,323
 40,199
49,623
 47,805
 43,498
Total Operating Expenses966,319
 961,173
 926,978
1,047,241
 1,039,213
 966,319
Operating Income230,371
 200,487
 229,408
259,303
 230,688
 230,371
Other Income (Deductions)          
Interest Income120
 136
 3,567
93
 208
 120
Other Income5,770
 3,953
 5,364
6,647
 8,598
 5,770
Other Expense(10,715) (13,574) (12,064)(2,833) (12,735) (10,715)
Appreciation in Fair Value of Investments2,833
 1,892
 329
Appreciation (Depreciation) in Value of Investments(142) 1,371
 2,833
Total Other Income (Deductions)(1,992) (7,593) (2,804)3,765
 (2,558) (1,992)
Interest Expense          
Long-Term Debt56,378
 55,038
 49,858
61,159
 60,577
 56,378
Capital Leases25,140
 33,613
 40,358
3,994
 10,249
 25,140
Other Interest Expense87
 1,446
 1,127
1,134
 810
 87
Interest Capitalized(2,554) (1,782) (2,073)(2,732) (3,755) (2,554)
Total Interest Expense79,051
 88,315
 89,270
63,555
 67,881
 79,051
Income Before Income Taxes149,328
 104,579
 137,334
199,513
 160,249
 149,328
Income Tax Expense47,986
 39,109
 52,000
71,719
 57,911
 47,986
Net Income$101,342
 $65,470
 $85,334
$127,794
 $102,338
 $101,342

See Notes to Consolidated Financial Statements.The accompanying notes are an integral part of these financial statements.


K-8245





TUCSON ELECTRIC POWER COMPANY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Amounts in thousands)
Years Ended December 31,
2013 2012 2011Year Ended December 31,
Thousands of Dollars2015 2014 2013
Comprehensive Income          
Net Income$101,342
 $65,470
 $85,334
$127,794
 $102,338
 $101,342
Other Comprehensive Income (Loss)          
Net Changes in Fair Value of Cash Flow Hedges, net of income tax (expense) benefit of $(1,793), $(887), and $9412,738
 1,354
 (1,433)
SERP Benefit Amortization, net of income tax (expense) benefit of $(572), $608, and $(804)916
 (840) 1,158
Net Changes in Fair Value of Cash Flow Hedges:     
Net of Income Tax (Expense) Benefit of ($821), ($1,140), and ($1,793)1,261
 1,675
 2,738
Supplemental Executive Retirement Plan Adjustments:     
Net of Income Tax (Expense) Benefit of ($63), $1,068, and ($572)101
 (1,725) 916
Total Other Comprehensive Income (Loss), Net of Tax3,654
 514
 (275)1,362
 (50) 3,654
Total Comprehensive Income$104,996
 $65,984
 $85,059
$129,156
 $102,288
 $104,996

See Notes to Consolidated Financial Statements.The accompanying notes are an integral part of these financial statements.


K-8346




TUCSON ELECTRIC POWER COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Amounts in thousands)
 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
Cash Flows from Operating Activities     
Cash Receipts from Electric Retail Sales$1,020,903
 $1,006,926
 $963,247
Cash Receipts from Electric Wholesale Sales146,880
 124,594
 152,618
Cash Receipts from Operating Springerville Units 3 & 4114,258
 107,927
 104,754
Reimbursement of Affiliate Charges23,468
 20,926
 18,448
Cash Receipts from Gas Wholesale Sales3,271
 4,652
 11,825
Interest Received509
 2,025
 5,367
Income Tax Refunds Received77
 493
 7,492
Other Cash Receipts25,079
 18,850
 19,611
Fuel Costs Paid(280,639) (313,742) (271,975)
Payment of Operations and Maintenance Costs(253,054) (282,752) (287,615)
Taxes Other Than Income Taxes Paid, Net of Amounts Capitalized(144,849) (147,859) (139,728)
Purchased Power Costs Paid(115,008) (81,328) (117,224)
Wages Paid, Net of Amounts Capitalized(110,995) (104,955) (100,942)
Interest Paid, Net of Amounts Capitalized(52,589) (52,125) (45,433)
Capital Lease Interest Paid(22,553) (28,786) (32,103)
Income Taxes Paid
 (1,796) (2,346)
Wholesale Gas Cost Paid
 
 (11,822)
Other Cash Payments(8,567) (5,131) (5,880)
Net Cash Flows—Operating Activities346,191
 267,919
 268,294
Cash Flows from Investing Activities     
Capital Expenditures(252,848) (252,782) (351,890)
Purchase of Intangibles—Renewable Energy Credits(23,280) (8,889) (5,111)
Return of Investments in Springerville Lease Debt9,104
 19,278
 38,353
Change in Restricted Cash4,134
 (1,445) 
Other, net3,228
 15,957
 6,637
Net Cash Flows—Investing Activities(259,662) (227,881) (312,011)
Cash Flows from Financing Activities     
Proceeds from Borrowings Under Revolving Credit Facility78,000
 189,000
 220,000
Repayments of Borrowings Under Revolving Credit Facility(78,000) (199,000) (210,000)
Payments of Capital Lease Obligations(99,621) (89,452) (74,343)
Dividends Paid to UNS Energy(40,000) (30,000) 
Proceeds from Issuance of Long-Term Debt
 149,513
 260,285
Repayments of Long-Term Debt
 (6,535) (172,460)
Equity Investment from UNS Energy
 
 30,000
Other, net(1,316) (1,539) (2,030)
Net Cash Flows—Financing Activities(140,937) 11,987
 51,452
Net Increase (Decrease) in Cash and Cash Equivalents(54,408) 52,025
 7,735
Cash and Cash Equivalents, Beginning of Year79,743
 27,718
 19,983
Cash and Cash Equivalents, End of Year$25,335
 $79,743
 $27,718
 Year Ended December 31,
 2015 2014 2013
Cash Flows from Operating Activities     
Net Income$127,794
 $102,338
 $101,342
Adjustments to Reconcile Net Income To Net Cash Flows from Operating Activities:     
Depreciation Expense138,093
 126,520
 118,076
Amortization Expense19,261
 28,567
 31,294
Amortization of Debt Issuance Costs3,043
 2,626
 2,452
Provision for Springerville Unit 1 - Third-Party Owners Unrealized Revenue22,627
 
 
Use of Renewable Energy Credits for Compliance19,731
 17,818
 15,990
Deferred Income Taxes72,026
 59,024
 58,100
Pension and Retiree Expense18,588
 13,648
 19,878
Pension and Retiree Funding(30,682) (14,388) (27,636)
Allowance for Equity Funds Used During Construction(5,352) (6,677) (4,526)
LFCR and DSM Revenues(14,646) (12,937) (2,575)
Increase (Decrease) to Reflect PPFAC Recovery Treatment39,787
 (11,194) (12,458)
Fortis Acquisition Direct Customer Benefit
 18,870
 
Change in Current Assets and Current Liabilities:     
Accounts Receivable(25,690) (14,261) 824
Materials, Supplies, and Fuel Inventory(8,758) 666
 16,145
Accounts Payable(23,149) 10,712
 334
Regulatory Liabilities(2,977) 8,388
 3,331
Other, Net15,238
 (16,057) 25,620
Net Cash Flows—Operating Activities364,934
 313,663
 346,191
Cash Flows from Investing Activities     
Capital Expenditures(333,841) (323,524) (252,848)
Purchase of Gila River Unit 3
 (163,938) 
Purchase of Springerville Coal Handling Facilities Lease Assets(120,312) 
 
Purchase of Springerville Unit 1 Lease Assets(45,753) (19,608) 
Proceeds from Sale of Springerville Coal Handling Facilities23,656
 
 
Purchase of Intangibles - Renewable Energy Credits(29,184) (28,334) (23,280)
Return of Investments in Springerville Lease Debt
 
 9,104
Contributions in Aid of Construction4,517
 15,903
 3,959
Other, Net(1,974) 1,863
 3,403
Net Cash Flows—Investing Activities(502,891) (517,638) (259,662)
Cash Flows from Financing Activities     
Proceeds from Borrowings Under Revolving Credit Facilities148,000
 275,000
 78,000
Repayments of Borrowings Under Revolving Credit Facilities(233,000) (190,000) (78,000)
Proceeds from Borrowings Under Term Loan130,000
 
 
Repayments of Borrowings Under Term Loan(130,000) 
 
Proceeds from Issuance of Long-Term Debt299,019
 149,168
 
Repayments of Long-Term Debt(208,600) 
 
Dividends Paid to Parent(50,000) (40,000) (40,000)
Payments of Capital Lease Obligations(13,464) (165,145) (99,621)
Payment of Debt Issue/Retirement Costs(3,942) (1,856) (1,865)
Contribution from Parent180,000
 225,000
 
Other, Net1,458
 643
 549
Net Cash Flows—Financing Activities119,471
 252,810
 (140,937)
Net Increase (Decrease) in Cash and Cash Equivalents(18,486) 48,835
 (54,408)
Cash and Cash Equivalents, Beginning of Period74,170
 25,335
 79,743
Cash and Cash Equivalents, End of Period$55,684
 $74,170
 $25,335
See Note 14 for supplemental cash flow information.
See Notes to Consolidated Financial Statements.The accompanying notes are an integral part of these financial statements.

K-8447




TUCSON ELECTRIC POWER COMPANY
CONSOLIDATED BALANCE SHEETS
(Amounts in thousands, except share data)
December 31,
2013 2012December 31,
Thousands of Dollars2015 2014
ASSETS      
Utility Plant      
Plant in Service$4,467,667
 $4,348,041
$5,618,435
 $5,175,148
Utility Plant Under Capital Leases637,957
 582,669
131,705
 667,157
Construction Work in Progress180,485
 98,460
102,028
 109,070
Total Utility Plant5,286,109
 5,029,170
5,852,168
 5,951,375
Less Accumulated Depreciation and Amortization(1,826,977) (1,783,787)(2,194,301) (2,052,216)
Less Accumulated Amortization of Capital Lease Assets(514,677) (494,962)(99,638) (473,969)
Total Utility Plant—Net2,944,455
 2,750,421
Total Utility Plant, Net3,558,229
 3,425,190
   
Investments and Other Property   39,569
 37,599
Investments in Lease Equity36,194
 36,339
Other33,488
 35,091
Total Investments and Other Property69,682
 71,430
   
Current Assets      
Cash and Cash Equivalents25,335
 79,743
55,684
 74,170
Accounts Receivable—Customer80,211
 71,813
Unbilled Accounts Receivable34,369
 33,782
Allowance for Doubtful Accounts(4,825) (4,598)
Accounts Receivable—Due from Affiliates6,064
 5,720
Accounts Receivable, Net136,682
 131,799
Fuel Inventory34,600
 36,368
Materials and Supplies75,200
 80,377
94,003
 86,750
Deferred Income Taxes—Current63,497
 37,212
Fuel Inventory44,027
 61,737
Regulatory Assets—Current42,555
 34,345
Regulatory Assets51,841
 69,383
Derivative Instruments2,137
 2,230
1,808
 1,633
Investments in Lease Debt
 9,118
Assets Held for Sale, Net21,550
 
Other12,923
 32,163
25,904
 21,010
Total Current Assets381,493
 443,642
422,072
 421,113
Regulatory and Other Assets      
Regulatory Assets—Noncurrent141,030
 178,330
Regulatory Assets212,312
 223,192
Derivative Instruments167
 1,354
430
 300
Other Assets19,233
 15,869
Other16,866
 12,436
Total Regulatory and Other Assets160,430
 195,553
229,608
 235,928
Total Assets$3,556,060
 $3,461,046
$4,249,478
 $4,119,830
See Notes to Consolidated Financial Statements.The accompanying notes are an integral part of these financial statements.

(Continued)

K-8548




TUCSON ELECTRIC POWER COMPANY
CONSOLIDATED BALANCE SHEETS
(Amounts in thousands, except share data)
December 31,
2013 2012December 31,
Thousands of Dollars2015 2014
CAPITALIZATION AND OTHER LIABILITIES      
Capitalization      
Common Stock Equity$925,923
 $860,927
Common Stock Equity:   
Common Stock (No Par Value, 75,000,000 Shares Authorized, 32,139,434 Shares Outstanding at December 31, 2015 and 2014)$1,296,539
 $1,116,539
Capital Stock Expense(6,357) (6,357)
Accumulated Earnings189,317
 111,523
Accumulated Other Comprehensive Loss(4,564) (5,926)
Total Common Stock Equity1,474,935
 1,215,779
Preferred Stock (No Par Value, 1,000,000 Shares Authorized, None Outstanding at December 31, 2015 and 2014)
 
Capital Lease Obligations149,767
 262,138
55,324
 69,438
Long-Term Debt1,223,070
 1,223,442
Long-Term Debt, Net1,451,720
 1,361,828
Total Capitalization2,298,760
 2,346,507
2,981,979
 2,647,045
Current Liabilities      
Current Obligations Under Capital Leases167,659
 90,583
14,114
 173,822
Accounts Payable—Trade88,556
 82,122
Accounts Payable—Due to Affiliates9,153
 3,134
Borrowings Under Revolving Credit Facilities
 85,000
Accounts Payable86,274
 113,413
Accrued Taxes Other than Income Taxes34,485
 33,060
37,577
 36,110
Accrued Employee Expenses24,454
 20,715
27,718
 15,679
Regulatory Liabilities—Current23,701
 20,822
Accrued Interest22,785
 26,965
14,246
 21,021
Regulatory Liabilities53,077
 38,847
Customer Deposits21,354
 24,846
20,349
 20,339
Derivative Instruments5,531
 4,899
12,174
 18,874
Other9,244
 7,085
7,533
 9,673
Total Current Liabilities406,922
 314,231
273,062
 532,778
Deferred Credits and Other Liabilities   
Deferred Income Taxes—Noncurrent420,878
 319,216
Regulatory Liabilities—Noncurrent263,270
 241,189
Pension and Other Retiree Benefits84,936
 149,718
Regulatory and Other Liabilities   
Deferred Income Taxes, Net468,024
 389,540
Regulatory Liabilities307,286
 321,186
Pension and Other Postretirement Benefits120,336
 138,319
Derivative Instruments5,161
 10,565
4,067
 6,288
Other76,133
 79,620
94,724
 84,674
Total Deferred Credits and Other Liabilities850,378
 800,308
Commitments, Contingencies, and Environmental Matters (Note 7)
 
Total Regulatory and Other Liabilities994,437
 940,007
   
Commitments and Contingencies
 
   
Total Capitalization and Other Liabilities$3,556,060
 $3,461,046
$4,249,478
 $4,119,830

See Notes to Consolidated Financial Statements.The accompanying notes are an integral part of these financial statements.

(Concluded)


K-8649



TUCSON ELECTRIC POWER COMPANY
CONSOLIDATED STATEMENTS OF CAPITALIZATION
      December 31,
      2013 2012
       Thousands of Dollars
COMMON STOCK EQUITY        
Common Stock-No Par Value     $888,971
 $888,971
  2013 2012    
Shares Authorized 75,000,000
 75,000,000
    
Shares Outstanding 32,139,434
 32,139,434
    
Capital Stock Expense     (6,357) (6,357)
Accumulated Earnings (Deficit)     49,185
 (12,157)
Accumulated Other Comprehensive Loss     (5,876) (9,530)
Total Common Stock Equity     925,923
 860,927
PREFERRED STOCK        
No Par Value, 1,000,000 Shares Authorized, None Outstanding     
 
CAPITAL LEASE OBLIGATIONS        
Springerville Unit 1     192,871
 196,843
Springerville Coal Handling Facilities     27,878
 48,038
Springerville Common Facilities     96,677
 107,840
Total Capital Lease Obligations     317,426
 352,721
Less Current Maturities     (167,659) (90,583)
Total Long-Term Capital Lease Obligations     149,767
 262,138
LONG-TERM DEBT        
  Maturity Interest Rate    
Variable Rate Bonds 2016 - 2032 Variable 214,802
 215,300
Fixed Rate Bonds 2020 - 2040 3.85% – 5.75% 1,008,268
 1,008,142
Total Long-Term Debt     1,223,070
 1,223,442
Total Capitalization     $2,298,760

$2,346,507
See Notes to Consolidated Financial Statements.


K-87




TUCSON ELECTRIC POWER COMPANY
CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDER'S EQUITY
(Amounts in thousands)
 
Common
Stock
 
Capital
Stock
Expense
 Accumulated Earnings (Deficit) 
Accumulated
Other
Comprehensive
Loss
 
Total
Stockholder’s
Equity
 Thousands of Dollars
Balances at December 31, 2010$858,971
 $(6,357) $(132,961) $(9,769) $709,884
Net Income    85,334
   85,334
Other Comprehensive Loss, net of tax      (275) (275)
Capital Contribution from UNS Energy30,000
       30,000
Balances at December 31, 2011888,971
 (6,357) (47,627) (10,044) 824,943
Net Income    65,470
   65,470
Other Comprehensive Income, net of tax      514
 514
Dividends Declared    (30,000)   (30,000)
Balances at December 31, 2012888,971
 (6,357) (12,157) (9,530) 860,927
Net Income    101,342
   101,342
Other Comprehensive Income, net of tax      3,654
 3,654
Dividends Declared    (40,000)   (40,000)
Balances at December 31, 2013$888,971
 $(6,357) $49,185
 $(5,876) $925,923
 Common
Stock
 
Capital
Stock
Expense
 
Accumulated
Earnings
(Deficit)
 Accumulated
Other
Comprehensive
Loss
 
Total
Stockholder's
Equity
Balances at December 31, 2012$888,971
 $(6,357) $(12,157) $(9,530) $860,927
Net Income    101,342
   101,342
Other Comprehensive Income (Loss), Net of Tax      3,654
 3,654
Dividends Declared to Parent

   (40,000)   (40,000)
Balances at December 31, 2013888,971
 (6,357) 49,185
 (5,876) 925,923
Net Income    102,338
   102,338
Other Comprehensive Income (Loss), Net of Tax      (50) (50)
Dividends Declared to Parent    (40,000)   (40,000)
Contribution from Parent225,000
       225,000
Other2,568
       2,568
Balances at December 31, 20141,116,539
 (6,357) 111,523
 (5,926) 1,215,779
Net Income    127,794
   127,794
Other Comprehensive Income (Loss), Net of Tax      1,362
 1,362
Dividends Declared to Parent    (50,000)   (50,000)
Contribution from Parent180,000
       180,000
Balances at December 31, 2015$1,296,539
 $(6,357) $189,317
 $(4,564) $1,474,935
We describe limitations on our ability to pay dividends in Note 13.
See Notes to Consolidated Financial Statements.The accompanying notes are an integral part of these financial statements.


K-8850

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



NOTE 1. NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIESFINANCIAL STATEMENT PRESENTATION
NATURE OF OPERATIONS
UNS Energy Corporation (UNS Energy) is a utility services holding company engaged, through its subsidiaries, in the electric generation and energy delivery business. Each of UNS Energy’s subsidiaries is a separate legal entity with its own assets and liabilities. UNS Energy owns 100% of Tucson Electric Power Company (TEP), UniSource Energy Services, Inc. (UES), Millennium Energy Holdings, Inc. (Millennium), and UniSource Energy Development Company (UED).
TEP is a regulated utility and UNS Energy’s largest operating subsidiary, representing approximately 83% of UNS Energy’s total assets as of December 31, 2013. TEPthat generates, transmits, and distributes electricity to approximately 413,000417,000 retail electric customers in a 1,155 square mile area in southeastern Arizona. TEP also sells electricity to other utilities and power marketing entities, located primarily in the western United States. In addition, TEP operates Springerville Generating Station (Springerville) Unit 3 on behalf of Tri-State Generation and Transmission Association, Inc. (Tri-State) and Springerville Unit 4 on behalf of Salt River Project Agriculture Improvement and Power District (SRP).
UES wholly-owns two regulated utilities: UNS Electric, Inc. (UNS Electric) and UNS Gas, Inc. (UNS Gas). UNS Electric is a regulated utility, which generates, transmits and distributes electricity to approximately 93,000 retail customers in Mohave and Santa Cruz counties in Arizona. UNS Gas is a regulated gas distribution company, which services approximately 150,000 retail customers in Mohave, Yavapai, Coconino, Navajo, and Santa Cruz counties in Arizona.
UED and Millennium’s investments in unregulated businesses represent less than 1%wholly owned subsidiary of UNS Energy’s assets asEnergy Corporation (UNS Energy), a utility services holding company. UNS Energy is an indirect wholly owned subsidiary of December 31, 2013.
Our business is comprised of three reporting segments – TEP, UNS Electric, and UNS Gas.Fortis Inc. (Fortis).
References in these notes to “we”"we" and “our”"our" are to TEP.
FORTIS ACQUISITION OF UNS ENERGY
UNS Energy, the parent of TEP, was acquired by Fortis for $60.25 per share of UNS Energy common stock in cash, effective August 15, 2014. The Arizona Corporation Commission's (ACC) approval was subject to certain stipulations, including, but not limited to, the following:
TEP will provide credits on retail customers' bills totaling approximately $19 million over five years: $6 million in year one and $3 million annually in years two through five. The monthly bill credits will be applied each year from October through March effective October 1, 2014;
Dividends paid from TEP to UNS Energy cannot exceed 60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital; and
Fortis making an equity investment of at least $220 million to UNS Energy and its regulated subsidiaries, collectively.including TEP. Following the UNS Energy acquisition, Fortis exceeded the investment requirement by contributing $287 million to UNS Energy through December 31, 2014. UNS Energy then contributed $225 million to TEP.
As a result of the acquisition being completed, TEP recorded approximately $15 million, through August 2014, as its allocated share of acquisition-related expenses, in addition to the customer bill credits discussed above. Acquisition-related expenses, reported in Operations and Maintenance and Other Expense, include investment banker fees, legal expenses, and accelerated expenses for certain share-based compensation awards. See Note 29 for additional information regarding a pending merger with Fortis, Inc.share-based compensation.
BASIS OF PRESENTATION
UNS Energy'sTEP's consolidated financial statements and disclosures are presented in accordance with generally accepted accounting principlesGenerally Accepted Accounting Principles (GAAP) in the United States which includes specific accounting guidance for regulated operations. See Note 3.2 for additional information regarding regulatory matters. The consolidated financial statements include the accounts of UNS EnergyTEP and all of its subsidiaries. In the consolidation process, accounts of the parent and subsidiaries are combined and intercompany balances and transactions are eliminated. Intercompany profits on transactions between regulated entities are not eliminated if recovery from ratepayers is probable. See Note 4. TEP jointly owns several generating stations and transmission facilities with non-affiliated entities. TEP's proportionate share of jointly owned facilities is recorded as Utility Plant on the consolidated balance sheets,Consolidated Balance Sheets, and our proportionate share of the operating costs associated with these facilities is included inon the consolidated statements of income. See Note 5.3 for additional information regarding Utility Plant.
TEP did not reflect the impacts of acquisition accounting in its financial statements. All adjustments of assets and liabilities to fair value and the resultant goodwill associated with the acquisition were recorded by FortisUS Inc., a wholly owned subsidiary of Fortis.
Certain amounts from prior periods have been reclassified to conform to the current year presentation. Most notably, in 2014, TEP elected to change its method of reporting cash flows from the direct to the indirect method to conform to Fortis' presentation election.
RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS
In 2015, we adopted accounting guidance that:
limits the circumstances under which a disposal may be reported as a discontinued operation and requires new disclosures. The adoption of this guidance did not have any impact on our disclosures, financial condition, results of operations, or cash flows as we did not have any activities that required application of this accounting guidance.
requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, rather than as deferred charges. The adoption of this standard resulted in reclassification of

51


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



debt issuance costs from Other Current Assets and Other Assets to Long-Term Debt on the Consolidated Balance Sheets. TEP will continue to account for debt issuance costs related to line-of-credit arrangements as an asset. TEP reclassified $11 million at December 31, 2014 from Other Current Assets and Other Assets to Long-Term Debt to conform to the current year presentation.
simplifies the presentation of deferred taxes by requiring deferred tax assets and liabilities to be classified as noncurrent on the balance sheet. The adoption of this standard resulted in a reclassification of deferred income taxes from Deferred Income Taxes - Current Assets to Deferred Income Taxes - Regulatory and Other Liabilities. TEP reclassified $102 million at December 31, 2014 from Deferred Income Taxes - Current Assets to Deferred Income Taxes - Regulatory and Other Liabilities to conform to the current year presentation.
USE OF ACCOUNTING ESTIMATES
Management uses estimates and assumptions when preparing financial statements under GAAP. These estimates and assumptions affect:
Assetsassets and liabilities on our balance sheets at the dates of the financial statements;
Ourour disclosures about contingent assets and liabilities at the dates of the financial statements; and
Ourour revenues and expenses in our income statements during the periods presented.
Because these estimates involve judgments based upon our evaluation of relevant facts and circumstances, actual results may differ from the estimates.
ACCOUNTING FOR REGULATED OPERATIONS
We apply accounting standards that recognize the economic effects of rate regulation. As a result, we capitalize certain costs that would be recorded as expense or in Accumulated Other Comprehensive Income (AOCI) by unregulated companies.

K-89

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Regulatory assets represent incurred costs that have been deferred because they are probable of future recovery in the rates charged to retail customers or to wholesale customers through FERC-approved transmission tariffs. Regulatory liabilities generally represent expected future costs that have already been collected from customers or itemsamounts that are expected to be returned to customers through future billingrate reductions.
Estimates of recovering deferred costs and returning deferred credits are based on specific ratemaking decisions or precedent for each item. Regulatory assets and liabilities are amortized consistent with the treatment in the rate setting process. We evaluate regulatory assets each period and believe recovery is probable. If future recovery of costs ceases to be probable, the assets would be written off as a charge to current period earnings or AOCI. See Note 3.2 for additional information regarding regulatory matters.
TEP UNS Electric, and UNS Gas applyapplies regulatory accounting as the following conditions exist:
An independent regulator sets rates;
The regulator sets the rates to recover the specific enterprise’s costs of providing service; and
Rates are set at levels that will recover the entity’s costs and can be charged to and collected from customers.
RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS
In 2013, we adopted authoritative guidance that:
Requires disclosure related to offsetting derivative assets and derivative liabilities in accordance with GAAP. See Note 15.
Requires additional disclosures for amounts reclassified out of Accumulated Other Comprehensive Income (AOCI) by component. See Note 16.
CASH AND CASH EQUIVALENTS
We consider all highly liquid investments with a remaining maturity of three months or less at acquisition to be cash equivalents.
RESTRICTED CASH
Cash balances that are restricted regarding withdrawal or usage based on contractual or regulatory considerations are reported in Investments and Other Property—OtherProperty on the balance sheets. Restricted cash was $4 million at December 31, 2015 and $2 million at December 31, 20132014.

52



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



ALLOWANCE FOR DOUBTFUL ACCOUNTS
We record an Allowance for Doubtful Accounts to reduce accounts receivable for amounts estimated to be uncollectible. The allowance is determined based on historical bad debt patterns, retail sales, and $7 millioneconomic conditions. Accounts receivable are charged-off in the period in which the receivable is deemed uncollectible. The change in the balance of the Allowance for Doubtful Accounts in our Consolidated Balance Sheets is summarized as follows:
 Year Ended December 31,
(in millions)2015 2014 2013
Beginning of Period$5
 $5
 $5
Increases:     
Charged to Operating Revenues23
 
 
Charged to Operating Expenses2
 2
 2
Write-offs(3) (2) (2)
End of Period$27
 $5
 $5
The Allowance for Doubtful Accounts increased in 2015 due to Third-Party Owners' claims at December 31, 2012.Springerville Unit 1. See Note 7 for additional information regarding the Third-Party Owners' claims.
INVENTORY
We value materials, supplies, and fuel inventory at the lower of weighted average cost or market, unless evidence indicates that the weighted average cost (even if in excess of market) will be recovered in retail rates. We capitalize handling and procurement costs (such as labor, overhead costs, and transportation costs) as part of the cost of the inventory. Materials and Supplies consist of generation, transmission, and distribution construction and repair materials.
UTILITY PLANT
Utility Plant includes the business property and equipment that supports electric and gas services,service, consisting primarily of generation, transmission, and distribution facilities. We report utility plant at original cost. Original cost includes materials and labor, contractor services, construction overhead (when applicable), and an Allowance for Funds Used During Construction (AFUDC), less contributions in aid of construction.
We record the cost of repairs and maintenance, including planned major overhauls, to Operations and Maintenance (O&M) expense in the income statementsstatement as costs are incurred.
When a unit of regulated property is retired, we reduce accumulated depreciation by the original cost plus removal costs less any salvage value. There is no income statement impact.
AFUDC and Capitalized Interest
AFUDC reflects the cost of debt and equity funds used to finance construction and is capitalized as part of the cost of regulated utility plant. AFUDC amounts are capitalized and amortized through depreciation expense as a recoverable cost in Retail Rates. For operations that do not apply regulatory accounting, we capitalize interest related only to debt as a cost of construction. The capitalized interest that relates to debt is recorded as a reduction in Interest Expense in the income statements.statement. The capitalized cost for equity funds is recorded as Other Income in the income statements.statement.

K-90

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



The average AFUDC rates on regulated construction expenditures are included in the table below:
 2013 2012 2011
TEP7.38% 7.22% 6.72%
UNS Electric8.07% 7.89% 8.18%
UNS Gas7.89% 7.95% 8.32%
UNS Energy did not capitalize interest related to non-regulated construction activity in 2013 or 2012. UNS Energy capitalized interest on non-regulated construction activity at a rate of 3.30% for 2011.
 2015 2014 2013
Average AFUDC Rates6.12% 7.30% 7.38%
Depreciation
We compute depreciation for owned utility plant on a group method straight-line basis at depreciation rates based on the economic lives of the assets. See Note 3 and Note 5.for additional information regarding Utility Plant. The Arizona Corporation Commission (ACC)ACC approves depreciation rates for all generation and distribution assets. Transmission assets are subject to the jurisdiction of the Federal Energy Regulatory Commission (FERC). Depreciation rates are based on average useful lives and include estimates for salvage value and removal costs.

53



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Below are the summarized average annual depreciation rates for all utility plant:
 2013 2012 2011
TEP3.16% 3.22% 3.14%
UNS Electric3.94% 3.99% 4.02%
UNS Gas2.63% 2.69% 2.84%
 2015 2014 2013
Average Annual Depreciation Rates2.83% 2.99% 3.16%
TEP Utility Plant Under Capital Leases
TEP financedfinances the following generation assets with capital leases: Springerville Unit 1; facilities at Springerville used in common with Springerville Unit 1 and Unit 2 (Springerville Common Facilities); and the Springerville Coal Handling Facilities. with capital leases. The capital lease expense incurred consists of Amortization Expense (see Note 5) and Interest Expense—Capital Leases. TheSee Note 3 for additional information regarding Utility Plant and Note 6 for additional information related to the lease terms are described in Note 6.terms.
Computer Software Costs
We capitalize costs incurred to purchase and develop internal use computer software and amortize those costs over the estimated economic life of the product. If the software is no longer useful, we immediately charge capitalized computer software costs to expense.
INVESTMENTS IN LEASE DEBT AND EQUITY
TEP held an investment in lease debt relating to Springerville Unit 1 through its maturity date in January 2013 and recorded this investment at amortized cost and recognized interest income. TEP holds a 14% equity interest in Springerville Unit 1 and a 7% interest in certain Springerville Common Facilities (Springerville Unit 1 Leases). The fair value of these investments is described in Note 15. These investments do not reduce the capital lease obligations reflected on the balance sheet because there is no legal right of offset. TEP makes lease payments to a trustee who then distributes the payments to the equity holders.
TEP accounts for its equity interest in the Springerville Unit 1 Lease trust using the equity method.
ASSET RETIREMENT OBLIGATIONS
TEP and UNS Electric havehas identified legal Asset Retirement Obligations (AROs) related to the retirement of certain generation assets. Additionally, TEP and UNS Electric incurred AROs related to theirits photovoltaic assets as a result of entering into various ground leases.leases or easement agreements. We record a liability for a legal ARO in the period in which it is incurred if it can be reasonably estimated. When a new obligation is recorded, we capitalize the cost of the liability by increasing the carrying amount of the related long-lived asset. We record the increase in the liability due to the passage of time by recognizing accretion expense in O&M expense and depreciate the capitalized cost over the useful life of the related asset or, when applicable, the terms of the lease subject to ARO requirements. Beginning July 1, 2013, TEP began deferringdefers costs associated with the majority of its legal AROs as regulatory assets because newbased on the ACC's approval of these costs in TEP's depreciation rates approved in the 2013 TEP Rate Order include these costs.rates.

K-91

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Depreciation rates for all of our utilities also include a component for estimated future removal costs that have not been identified as legal obligations. We recover those amounts in the rates charged to retail customers and have recorded an obligation for estimated costs of removal as regulatory liabilities.
EVALUATION OF ASSETS FOR IMPAIRMENT
We evaluate long-lived assets and investments for impairment whenever events or circumstances indicate the carrying value of the assets may be impaired. If expected future cash flows (without discounting) are less than the carrying value of the asset, an impairment loss is recognized if the impairment is other-than-temporary and the loss is not recoverable through rates.
DEFERRED FINANCING COSTS
We defer the costs to issue debt and amortize such costs to interest expense on a straight-line basis over the life of the debt as this approximates the effective interest method. Deferred debt issuance costs are presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability. These costs include underwriters’ commissions, discounts or premiums, and other costs such as legal, accounting, regulatory fees, and printing costs.
TEP accounts for debt issuance costs related to line-of-credit arrangements as an asset.
We defer and amortize the gains and losses on reacquired debt associated with regulated operations to interest expense over the remaining life of the original debt.
OPERATING REVENUES
We recognize revenues related to the sale of energy when services or commodities are delivered to customers. The billing of electricity and gaselectric sales to retail customers is based on the reading of their meters, which occurs on a systematic basis throughout the month. Operating revenues include an estimate for unbilled revenues from service that has been provided but not billed by the end of an accounting period. At the end of the month, amounts of energy delivered since the last meter reading are estimated and the corresponding unbilled revenue is calculated using average customer Retail Rates.
For purchased power and wholesale sales contracts that are not settled with energy,financially, TEP and UNS Electric netnets the sales contracts with the purchase power contracts and reflectreflects the net amount as Electric Wholesale Sales. The corresponding cash receipts are recorded in the statement of cash flows as Cash Receipts from Electric Wholesale Sales, while cash payments are recorded as Purchased Energy/Power Costs Paid.

54



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



TEP recognizes monthly management fees in Other Revenues as the operator of Springerville Unit 3 on behalf of Tri-State Generation and Transmission Association, Inc. (Tri-State) and Springerville Unit 4 on behalf of SRP.Salt River Project Agriculture Improvement and Power District (SRP). Additionally, Other Revenues include reimbursements from Tri-State and SRP for various operating expenses at Springerville and for the use of the Springerville Common Facilities and the Springerville Coal Handling Facilities. The offsetting expenses are recorded in the respective line items of the income statements based on the nature of services provided. As the operating agent for Tri-State and SRP, TEP may earn performance incentives based on unit availability which are recognized in Other Revenues in the period earned.
The ACC has authorized mechanisms for Lost Fixed Cost Recovery (LFCR) associated with energyrelated to kilowatt-hour (kWh) sales that no longer occurlost due to EEEnergy Efficiency Standards (EE Standards) and distributed generation. We recognize revenues in the period that verifiable energy savings occur. Revenue recognition related to the LFCR creates a regulatory asset until such time as the revenue is collected.
ALLOWANCE FOR DOUBTFUL ACCOUNTSPURCHASED POWER AND FUEL ADJUSTMENT CLAUSE
We record an Allowance for Doubtful Accounts to reduce accounts receivable for amounts estimated to be uncollectible. The allowance is determined based on historical bad debt patterns, retail sales, and economic conditions.
INVENTORY
We value materials, supplies and fuel inventory at the lower of weighted average cost or market, unless evidence indicates that the weighted average cost (even if in excess of market) will be recovered in retail rates. We capitalize handling and procurement costs (such as labor, overhead costs, and transportation costs) as part of the cost of the inventory. Materials and Supplies consist of generation, transmission, and distribution construction and repair materials.
FUEL AND PURCHASED ENERGY COST RECOVERY MECHANISMS
TEP and UNS Electric Purchased Power and Fuel Adjustment Clause
TEP and UNS Electric recover actual fuel, purchased power and transmission costs incurred to provide electric service to retail customers through base fuel rates and a Purchased Power and Fuel Adjustment Clause (PPFAC); the ACC periodically adjusts

K-92

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



the PPFAC rate at which TEP and UNS Electric recoverrecovers these costs. The difference between costs recovered through rates and actual fuel, purchased power, transmission, and transmissionother approved costs prudently incurred to provide retail electric service is deferred. Cost over-recoveries are deferred as regulatory liabilities and cost under-recoveries are deferred as regulatory assets. See Note 3.
UNS Gas Purchased Gas Adjustor
UNS Gas recovers actual gas costs incurred through a Purchased Gas Adjustor (PGA) mechanism that adjusts monthly. Gas cost over-recoveries are deferred as2 for additional information regarding regulatory liabilities and under-recoveries are deferred as regulatory assets. See Note 3.matters.
RENEWABLE ENERGY andAND ENERGY EFFICIENCY PROGRAMS
The ACC’s Renewable Energy Standard (RES) requires TEP and UNS Electric to increase theirits use of renewable energy each year until it represents at least 15% of theirits total annual retail energy requirements in 2025. The utilities2025, with distributed generation accounting for 30% of the annual renewable energy requirement. TEP must file an annual RES implementation plansplan for review and approval by the ACC. The approved cost of carrying out those plansthis plan is recovered from retail customers through the RES surcharge. The ACC has also approved recovery of operating costs, depreciation, property taxes, and a return on investments in company-owned solar projects through the RES tariff until such costs are reflected in retail customer rates.
TEP UNS Electric, and UNS Gas areis required to implement cost-effective Demand-SideDemand Side Management (DSM) programs to comply with the ACC’s Energy Efficiency (EE)EE Standards. The EE Standards provide for a DSM surcharge to recover, from retail customers, the costs to implement DSM programs. The Electric EE Standards require increasing annual targeted retail kWh savings equal to22% by 2020. The Gas EE Standards require increasing annual targeted retail therm sales equal to 6%22% by 2020.
Any RES or DSM surcharge collections above or below the costs incurred to implement the plans are deferred and reflected in the financial statements as a regulatory asset or liability. TEP and UNS Electric recognizerecognizes RES and DSM surcharge revenue in Electric Retail Sales in amounts necessary to offset recognized qualifying expenditures. Similarly, UNS Gas recognizes DSM surcharge revenue in Gas Retail Sales.
RENEWABLE ENERGY CREDITS
The ACC measures compliance with the RES requirements through Renewable Energy Credits (RECs). A REC represents one kWh generated from renewable resources. When TEP or UNS Electric purchases renewable energy, the premium paid above the market cost of conventional power equals the REC cost recoverable through the RES surcharge. As described above, the market cost of conventional power is recoverable through the PPFAC.
When RECs are purchased, TEP and UNS Electric recordrecords the cost of the RECs (an indefinite-lived intangible asset) as Other Assets, and a corresponding regulatory liability, to reflect the obligation to use the RECs for future RES compliance. When RECs are reported to the ACC for compliance with RES requirements, TEP and UNS Electric recognizerecognizes Purchased Power expense and Other Revenues in an equal amount. See Note 3.2 for additional information regarding regulatory matters.
INCOME TAXES
Due to the difference between GAAP and income tax laws, many transactions are treated differently for income tax purposes than for financial statement presentation purposes. Temporary differences are accounted for by recording deferred income tax assets and liabilities on our balance sheets. These assets and liabilities are recorded using enacted income tax rates expected to be in effect when the deferred tax assets and liabilities are realized or settled. We reduce deferred tax assets by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or the entire deferred income tax asset will not be realized.
Tax benefits are recognized when it is more likely than not that a tax position will be sustained upon examination by the tax authorities based on the technical merits of the position. The tax benefit recorded is the largest amount that is more than 50%

55



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



likely to be realized upon ultimate settlement with the tax authority, assuming full knowledge of the position and all relevant facts. Interest expense accruals relating to income tax obligations are recorded in Other Interest Expense.
Prior to 1990, TEP flowed through to ratepayers certain accelerated tax benefits related to utility plant as the benefits were recognized on tax returns. Regulatory Assets – Noncurrent includesinclude income taxes recoverable through future rates, which reflects the future revenues due usto TEP from ratepayers as these tax benefits reverse. See Note 3.2 for additional information regarding regulatory matters.
We account for federal energy credits generated prior to 2012 using the grant accounting model. The credit is treated as deferred revenue, which is recognized over the depreciable life of the underlying asset. The deferred tax benefit of the credit is treated as a reduction to income tax expense in the year the credit arises. Federal energy credits generated since 2012 are

K-93

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



deferred as Regulatory Liabilities – Noncurrent and amortized as a reduction in Income Tax Expense over the tax life of the underlying asset. Income Tax Expense attributable to the reduction in tax basis is accounted for in the year the federal energy credit is generated and areis deferred as regulatory assets effective July 1, 2013 due to the 2013 TEP Rate Order.assets. All other federal and state income tax credits are treated as a reduction to Income Tax Expense in the year the credit arises.
Consolidated incomeIncome tax liabilities are allocated to subsidiariesTEP based on theirits taxable income as reported in the FortisUS Inc. consolidated tax return.
TAXES OTHER THAN INCOME TAXES
We act as conduits or collection agents for sales taxes, utility taxes, franchise fees, and regulatory assessments. As we bill customers for these taxes and assessments, we record trade receivables. At the same time, we record liabilities payable to governmental agencies on the balance sheet for these taxes and assessments. These amounts are not reflected in the income statements.
FAIR VALUE
As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange, and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange. See Note 11 for additional information regarding fair value.
DERIVATIVE INSTRUMENTS
We use various physical and financial derivative instruments, including forward contracts, financial swaps, and call and put options, to meet forecasted load and reserve requirements, to reduce our exposure to energy commodity price volatility and to hedge our interest rate risk exposure. For all derivative instruments that do not meet the normal purchase or normal sale scope exception, we recognize derivative instruments as either assets or liabilities on the consolidated balance sheetsConsolidated Balance Sheets and measure those instruments at fair value. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and the resulting designation.
Cash Flow Hedges
TEP hedges the cash flow risk associated with unfavorable changesCommodity derivatives used in the variable interest rates related to the leveraged lease arrangementsnormal business operations that are settled by physical delivery, among other criteria, are eligible for the Springerville Common Lease and variable rate industrial development revenuemay be designated as normal purchases or pollution control revenue bonds (IDBs). In addition, TEP hedges the cash flow risk associated with a long-term wholesale power supply agreement that doesnormal sales. Normal purchases or normal sales contracts are not qualify for regulatory recovery using a six-year power purchase swap agreement. UNS Electric uses a cash flow hedge to effectively convert the interest raterecorded at fair value and settled amounts are recognized as cost of fuel, energy and capacity on the UNS Electric term loan from a variable rate to a fixed rate. TEP and UNS Electric account for cash flow hedgesConsolidated Statements of Income.
For our derivatives designated as follows:
The effective portion of the change in the fair value is recorded in AOCI and the ineffective portion, if any, is recognized in earnings; and
When TEP and UNS Electric determine a contract is no longer effective in offsetting the changes in cash flow of a hedged item, TEP and UNS Electric recognize the change in fair value in earnings. The unrealized gains and losses at that time remain in AOCI and are reclassified into earnings as the underlying hedged transaction occurs.
Wehedging contracts, we formally assess, both at the hedge’s inception and on an ongoing basis,thereafter, whether the derivatives have been and are expected to remainhedging contract is highly effective in offsetting changes in the cash flows of hedged items.item. Also, we formally document hedging activity by transaction type and risk management strategy.
Energy Contracts - Regulatory Recovery
TEP, UNS Electric and UNS Gas are authorized to recoverFor our derivatives not designated as hedging contracts, the prudent costs of hedging activities entered into to mitigate energy price risk for retail customers. We recordsettled amount is generally included in regulated rates. Accordingly, the net unrealized gains and losses associated with interim price movements on these energy derivatives as either a regulatory asset or regulatory liability to the extent they qualify for recovery through the PPFAC or PGA mechanism.
Master Netting Agreements
We have elected gross presentation for our derivative contracts under master netting agreements and collateral positions. We separate all derivatives into current and long-term portions on the balance sheet.
Normal Purchases and Normal Sales
We enter into forward energy purchase and sales contracts, including call options, with counterparties that have generating capacity to support our current load forecasts or counterparties that have load serving requirements. We have elected the normal purchase or normal sales exception for these contracts which are not required to be measured at fair value and are accounted for on an accrual basis.as derivatives and probable of inclusion in regulated rates are recorded as regulatory assets and liabilities. See Note 11 for additional information regarding derivative instruments.

K-9456


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Commodity Trading
We did not engage in trading of derivative financial instruments.
PENSION AND OTHER RETIREE BENEFITS
We sponsor noncontributory, defined benefit pension plans for substantially all employees and certain affiliate employees. Benefits are based on years of service and average compensation. We also provide limited health care and life insurance benefits for retirees.
We recognize the underfunded status of our defined benefit pension plans as a liability on our balance sheets.sheet. The underfunded status is measured as the difference between the fair value of the pension plans’ assets and the projected benefit obligation for the pension plans. We recognize a regulatory asset to the extent these future costs are probable of recovery in the rates charged to retail customers and expect to recover these costs over the estimated service lives of employees.
Additionally, we maintain a Supplemental Executive Retirement Plan (SERP) for senior management. Changes in SERP benefit obligations are recognized as a component of AOCI.
Pension and other retiree benefit expenses are determined by actuarial valuations based on assumptions that we evaluate annually. See Note 10.8 for additional information regarding the employee benefit plans.


NOTE 2. PENDING MERGER WITH FORTIS
On December 11, 2013, UNS Energy announced that it had entered into an agreement and plan of merger, subject to shareholder and required regulatory approvals, to be acquired by Fortis for $60.25 per share of Common Stock in cash. Following the merger, UNS Energy will continue as a wholly owned subsidiary of Fortis. The Board of Directors of each of UNS Energy and Fortis Parent have approved the merger.


NOTE 3. REGULATORY MATTERS
The Arizona Corporation Commission (ACC)ACC and the Federal Energy Regulatory Commission (FERC)FERC each regulate portions of theTEP's utility accounting practices and rates of TEP, UNS Electric, and UNS Gas.rates. The ACC regulates rates charged to retail customers, the siting of generation and transmission facilities, the issuance of securities, transactions with affiliated parties, and the pending merger.other utility matters. The ACC also enacts other regulations and policies that can affect business decisions and accounting practices. The FERC regulates terms and prices of transmission services and wholesale electricity sales, and the pending merger.sales.
2013 TEP2015 RATE ORDERCASE
In June 2013,November 2015, TEP filed a general rate case with the ACC issued the 2013 TEP Rate Order that resolved the rate case filed by TEP in July 2012 which was based on a test year ended December 31, 2011. The 2013 TEP Rate Order approved new rates effective July 1, 2013.
The provisions of the 2013 TEP Rate Order include, but are not limited to:
an increase in non-fuel retail Base Rates of approximately $76 million over adjusted test year revenues;
an Original Cost Rate Base (OCRB) of approximately $1.5 billion and a Fair Value Rate Base (FVRB) of approximately $2.3 billion;
a return on equity of 10.0%, a long-term cost of debt of 5.18%, and a short-term cost of debt of 1.42%, resulting in a weighted average cost of capital of 7.26%;
a capital structure of approximately 43.5% equity, 56.0% long-term debt, and 0.5% short-term debt;
a 0.68% return on the fair value increment of rate base (the fair value increment of rate base represents the difference between OCRB and FVRB of approximately $800 million);

K-95

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



a revision in depreciation rates from an average rate of 3.32% to 3.0% for generation and distribution plant, primarily due to revised estimates of asset removal costs, which will have the effect of reducing depreciation expense by approximately $11 million annually; and
an agreement by TEP to seek recovery of costs related to the discontinued Nogales transmission project from the FERC before seeking rate recovery from the ACC.
The 2013 TEP Rate Order also includes the following cost recovery mechanisms:
a new Purchased Power and Fuel Adjustment Clause (PPFAC) credit of 0.1388 cents per kWh effective July 1, 2013. The credit reflects the following:
a reduction in the PPFAC bank balance, recorded in June 2013, as an increase to fuel expense, of $3 million related to prior sulfur credits; and
a transfer of $10 million, recorded in June 2013, from the PPFAC bank balance to a new regulatory asset to defer coal costs related to the San Juan mine fire. These costs will be eligible for recovery through the PPFAC upon final settlement with the San Juan operator related to insurance proceeds.
a modification of the PPFAC mechanism to include recovery of generation-related lime costs offset by sulfur credits.
a Lost Fixed Cost Recovery mechanism (LFCR) to recover certain non-fuel costs related to kWh sales lost due to energy efficiency programs and distributed generation. In the fourth quarter of 2013, TEP recorded revenues of $2 million related to unrecovered non-fuel costs incurred during 2013.
an Environmental Compliance Adjustor (ECA) mechanism to recover certain capital carrying costs to comply with government-mandated environmental regulations between rate cases. The ECA rate is capped at 0.025 cents per kWh, which approximates 0.25% of TEP's total retail revenues, and will be charged to customers beginning in May 2014 for any qualifying costs incurred between August 2013 and December 2013.
an energy efficiency provision which includes a 2013 calendar year budget of approximately $21 million to fund programs that support the ACC's Electric Energy Efficiency Standards, as well as a $2 million performance incentive.
2013 UNS ELECTRIC RATE ORDER
In December 2013, the ACC issued the 2013 UNS Electric Rate Order that resolved the rate case filed by UNS Electric in December 2012 which was based on a test year ended June 30, 2012.2015. The 2013 UNS Electric Rate Order approvedfiling requests that new rates effectivebe implemented by January 1, 2014.2017.
The key provisions of the 2013 UNS Electric Rate Order include, but are not limited to:TEP's general rate case include:
an increase in non-fuel retail Base Rates of approximately $3 million;
an OCRB of approximately $213 million and a FVRB of approximately $283 million;
a return on equity of 9.50% and a long-term cost of debt of 5.97% resulting in a weighted average cost of capital of 7.83%;
a 0.50% return on the fair value increment of rate base (the fair value increment of rate base represents the difference between OCRB and FVRB of approximately $70 million); and
a capital structure of 52.6% equity and 47.4% long-term debt.
The 2013 UNS Electric Rate Order also includes the following cost recovery mechanisms:
a LFCR mechanism to recover certain non-fuel costs related to kWh sales lost due to energy efficiency programs and distributed generation; and
a Transmission Cost Adjustor (TCA), which will allow more timely recovery of transmission costs associated with serving retail customers.

K-96

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



2012 UNS GAS RATE ORDER
In April 2012, the ACC approved a Base Rate increase of $2.7$110 million, or 1.8%12%, compared with adjusted test year revenues;
a 7.34% return on original cost rate base of $2.1 billion;
a request to apply excess depreciation reserves against the unrecovered net book value (NBV) of the San Juan Generating Station (San Juan) Unit 2 and an LFCR mechanismthe H. Wilson Sundt Generating Station (Sundt) Coal Handling Facilities due to enable UNS Gasearly retirement;
a request for authority to begin using the Third-Party Owners' portion of Unit 1 of the Springerville Generating Station (Springerville Unit 1) that is available to TEP for dispatch to serve retail customers' needs and to recover lostthe related operating costs through the PPFAC; and
rate design changes that would reduce the reliance on volumetric sales to recover fixed cost revenues as a result of implementing the ACC’s Gas Energy Efficiency Standards (Gas EE Standards).
The ACC approved an authorized rate of return of 8.3% on an OCRB of $183 million,costs and a 1.0% return onnew net metering tariff that would ensure that customers who install distributed generation pay an equitable price for their electric service.
TEP cannot predict the fair value incrementoutcome of this proceeding or whether its rate base (the fair value increment of rate base representsrequest will be adopted by the difference between OCRB and FVRB of approximately $70 million). The new rates became effectiveACC in May 2012.whole or in part.
COST RECOVERY MECHANISMS
TEP UNS Electric, and UNS Gas havehas received regulatory decisions that allow for more timely recovery of certain costs through the recovery mechanisms described below.
Purchased Power and Fuel Adjustment Clause
TEP's PPFAC rate is adjusted annually each April 1st (unless otherwise approved by the ACC) and goes into effect for the subsequent 12-month period unless suspendedmodified by the ACC.
TEP's The PPFAC rate includes: 1)(i) a forward component under which TEP recoversattempts to recover or refunds differencesrefund the difference between a) forecasted fuel transmission,costs and purchased power costs for the upcoming calendar year and b) those embedded in the fuel rate and the current PPFAC and fuel rates; and 2)(ii) a true-up component whichthat reconciles differencesthe difference between prudently incurred actual fuel, transmission, and purchased power costs and those recovered through the combination of the fuel rate and the forward component forin the preceding 12-month period.
Prior to the 2013 UNS Electric Rate Order, UNS Electric’s PPFAC rate was adjusted annually each June 1st, effective for the subsequent 12-month period. As a result of the 2013 UNS Electric Rate Order, effective January 1, 2014, UNS Electric's PPFAC rate reflects a weighted 12-month rolling average of actual fuel and purchased power costs incurred by UNS Electric. The PPFAC rate adjusts monthly, but it is restricted from changing by more than 0.83 percent from the preceding month's rate. If the PPFAC deferral balance reflects an over-collection of $10 million or more on a billed-to-customer basis, UNS Electric must file for a PPFAC rate adjustment. At December 31, 2013, the PPFAC bank balance was over-collected by $14$18 million on a billed-to-customer basis.at December 31, 2015 and under-collected by $19 million at December 31, 2014.

57



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



The tables below summarize TEP’s and UNS Electric’s PPFAC rates:rates during the periods reported were as follows:
 TEP
 2013 2012
 July - December January - June April - December January - March
 Cents per kWh
PPFAC Rate0.14
 0.77
 0.77
 0.53
Competition Transition Charge (1)

 
 
 (0.53)
Net TEP PPFAC Rate0.14
 0.77
 0.77
 
PeriodCents per kWh
April 2015 through March 20160.68
October 2014 through March 2015 (1)
0.50
May 2014 through September 2014 (1)
0.10
July 2013 through April 2014 (2)
(0.14)
January 2013 through June 20130.77
(1) 
TEP's PPFAC becameThe ACC approved a two-step increase to shift a higher level of recovery into the winter season.
(2)
The effective January 1, 2009. However, TEP was initially required to refund amounts to customers throughdate of the PPFAC mechanism that were over collected under the Competition Transition Charge (CTC) in place from 1999 through 2008. As a result, the authorized net PPFAC charge was set at zero until all over collected CTC revenue was fully refunded to customers (November 2011). TEP then continued deferring PPFAC eligible costs but was not authorized to bill customers until a new2012 PPFAC rate reduction was approved bydeferred to coincide with the ACC in April 2012.effective date of the 2013 Rate Order.
San Juan Mine Fire Insurance Proceeds
 UNS Electric
 2013 2012
 September - December June - August January - May June - December January - May
 Cents per kWh
PPFAC Rate(0.40) (0.92) (1.44) (1.44) (0.88)
UNS Gas Purchased Gas Adjustor
In September 2011, a fire at the underground mine providing coal to San Juan caused interruptions to mining operations and resulted in increased fuel costs. The PGA mechanism allows UNS Gas2013 Rate Order required TEP to adjust Retail Rates to recover fluctuations in natural gas costs. UNS Gas records deferrals for recovery or refund to the extent actual natural gasdefer incremental fuel costs vary from the PGA rate. The PGA rate reflects a weighted,

K-97

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



rolling average of the gas costs incurred by UNS Gas over the preceding 12 months. The PGA rate automatically adjusts monthly, but it is restricted from rising or falling more than 15 cents per therm in a twelve-month period. UNS Gas is required to request an additional surcredit if deferral balances reflect $10 million or more on a billed-to-customer basis.
In October 2013,from recovery under the ACC approvedPPFAC pending final resolution of an increaseinsurance claim by the San Juan Coal Company (SJCC) and distribution of insurance proceeds to San Juan participants. TEP received insurance proceeds of $1 million in 2015 and $8 million in 2014. The insurance proceeds offset the existing PGA credit from 4.5 cents per therm to 10 cents per thermdeferred fuel costs and are included in order to reduce the over-collected PGA bank balance.Statements of Cash Flows as an operating activity. The new PGA creditremaining $1 million of unreimbursed fuel costs will be effective forrecovered through the period November 1,PPFAC, in accordance with the 2013 through April 30, 2014. At December 31, 2013 and December 31, 2012, the PGA bank balance was over-collected by $10 million on a billed-to-customer basis.
The PGA rate ranged from 0.4504 to 0.5280 cents per therm in 2013, and ranged from 0.5202 to 0.6501 cents per therm in 2012.Rate Order.
Renewable Energy Standards
The ACC’s RES requires TEP and UNS Electric are requiredother affected utilities to expandincrease their use of renewable energy each year until it represents at least 15% of their total annual retail energy requirements in order2025, with distributed generation accounting for 30% of the annual renewable energy requirement. Affected utilities must file an annual RES implementation plan for review and approval by the ACC. The approved cost of carrying out the plan is recovered from retail customers through the RES surcharge until such costs are reflected in TEP’s Base Rates. The associated lost revenues attributable to meeting distributed generation targets will be partially recovered through the LFCR.
In July 2015, TEP submitted its application for the 2016 RES implementation plan that includes a budget of $57 million, which will be partially offset by applying approximately $9 million of previously recovered carryover funds. TEP proposed to recover $48 million through the RES surcharge. The budget will fund the following: (i) the above market cost of renewable energy purchases; (ii) previously awarded performance-based incentives for customer installed distributed generation; (iii) depreciation and a return on TEP's investments in company-owned solar projects; and (iv) various other program costs. TEP expects to receive a decision on the application in the first half of 2016. TEP expects to recognize approximately $9 million of revenue in 2016 as a return on company-owned solar projects.
TEP met the overall 2015 RES renewable energy requirement of 5% of retail Kilowatt-hour (kWh) sales and expects to meet the ACC’s RES. TEP and UNS Electric, through a customer surcharge, recover costs associated with meeting the RES. These costs include the purchases2016 requirement of RECs through Power Purchase Agreements (PPAs) and Performance Based Incentives (PBIs), as well as costs associated with utility-scale ownership6% of solar assets until the projects can be incorporated in Base Rates.
In October 2013, the ACC approved TEP's 2014 RES plan and authorized a total 2014 RES budget of $40 million with $34 million to be collectedretail kWh sales. Compliance is determined through the 2014ACC's review of TEP's annual RES funding mechanism.implementation plan. As TEP earned returns on solar investmentsno longer pays incentives to obtain distributed generation REC, which are used to demonstrate compliance with the distributed generation requirement, the company has requested a waiver of $2 millionthe RES distributed generation requirements in each of 2013 and 2012 and $1 million in 2011.
In October 2013, the ACC approved UNS Electric's 2014its 2016 RES plan and authorized a total 2014 RES budget of $7 million with $6 million to be collected through the 2014 RES funding mechanism.  UNS Electric earned returns on solar investments of less than $0.5 million in 2013 and 2012. No return was earned in 2011.implementation plan.
Energy Efficiency Standards
TEP, UNS Electric, and UNS Gas are requiredIn 2010, the ACC approved new EE Standards designed to require electric utilities to implement cost-effective DSM programs to complyreduce customers' energy consumption. The EE Standards require increasing cumulative annual targeted retail kWh savings equal to 22% by 2020. Since the implementation of the EE Standards, TEP’s cumulative annual energy savings are approximately 9.3% of 2015 retail kWh sales. TEP’s compliance with the EE Standards is governed by the ACC’s EE Standards. approval of its annual implementation plan.
The EE Standards provide for a DSM surcharge for regulated utilities to recover from retail customers, the costs to implement DSM programs.programs as well as an annual performance incentive. TEP recorded $3 million in 2015, $2 million in 2014, and less than $1 million in 2013 related to performance. The performance incentive is recorded in the first quarter of the year and is included in Electric Retail Sales on the Consolidated Statements of Income.
In December 2013,February 2016, the ACC approved UNS Electric’s 2013-2014TEP’s 2016 energy efficiency implementation plan. Under the 2016 plan, that included a 2014 calendar year budget ofTEP has been approved to recover approximately $5$14 million to fundfrom retail customers and will offer customers new and existing DSM

58


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



programs. Energy savings realized through the programs that supportwill count toward Arizona’s EE Standard and the ACC’s Electric EE Standards as well as a performance incentive.
In June 2013,associated lost revenue will be partially recovered through the ACC approved the UNS Gas 2011-2012 energy efficiency implementation plan with certain modifications. The approval included an annual energy efficiency budget of approximately $2 million and a waiver of the Gas EE Standards through 2013.LFCR.
Lost Fixed Cost Recovery Mechanism
The LFCR is a mechanism to recoverprovides recovery of certain non-fuel costs that would go unrecovered due to lost retail kWh sales as a result of implementing ACC approved EE Standardsenergy efficiency programs and distributed generation targets.
In April 2012, TEP records a regulatory asset and recognizes LFCR revenues when the amounts are verifiable, regardless of when the lost retail kWh sales occur. For recovery of the LFCR regulatory asset, TEP is required to file an annual LFCR adjustment request with the ACC authorized afor the LFCR mechanism that enables UNS Gas to recover non-purchased energy related costs that would go unrecovered due to lost therm sales as a result of implementingrevenues recognized in the Gas EE Standards.
In June 2013, the ACC authorized a LFCR mechanism for TEPprior year. The recovery is subject to a year-over-year cap of 1% of TEP's total retail revenues.
TEP expectsrecorded a regulatory asset and recognized LFCR revenues of $12 million in 2015, $11 million in 2014, and $2 million in 2013 related to reductions in retail kWh sales for the prior years. LFCR revenues are included in Electric Retail Sales on the Consolidated Statements of Income.
Appellate Review of Rate Decisions
In a 2015 appellate challenge to two ACC rate which will recover 2013 costs, to be effective on July 1, 2014, upon review bydecisions regarding a water company, the Arizona Court of Appeals considered the question of how the ACC should determine a utility’s “fair value”, as specified in the Arizona Constitution, in connection with authorizing recovery of verified lost kWh sales.
costs through rate adjustors outside of a rate case. The Court reversed the ACC’s method of finding fair value in that case, and raised questions concerning the relationship between the need for fair value findings and the recovery of capital and certain other utility costs through adjustors. In December 2013, as partFebruary 2016, the Arizona Supreme Court granted the ACC’s request for review of this decision. If the Supreme Court upholds the decision without modification, certain TEP rate adjustors may be negatively affected which could have a significant impact on TEP’s ability to recover certain costs between rate cases. TEP filed a brief in support of the 2013 UNS Electric Rate Order,ACC’s petition to the ACC authorized a LFCRSupreme Court for UNS Electric, to be effective on July 1, 2014.review of the Court of Appeals’ decision, but cannot predict the outcome of this matter.

K-9859

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



REGULATORY ASSETS AND LIABILITIES
The following tables summarize regulatory assets and liabilities:
 December 31, 2013
 TEP UNS
Electric
 
UNS
Gas
 
UNS
Energy
 Millions of Dollars
Regulatory Assets—Current       
Property Tax Deferrals (1)
$20
 $
 $
 $20
Derivative Instruments (Note 15)1
 
 
 1
San Juan Mine Fire Cost Deferral (2)
10
 
 
 10
PPFAC (2)
4
 10
 
 14
DSM and LFCR (2)
3
 
 
 3
Other Current Regulatory Assets (3)
5
 
 
 5
Total Regulatory Assets—Current43
 10
 
 53
Regulatory Assets—Noncurrent       
Pension and Other Retiree Benefits (Note 10)75
 3
 2
 80
Income Taxes Recoverable through Future Revenues (4)
22
 3
 
 25
PPFAC—Final Mine Reclamation and Retiree Health Care Costs (5)
25
 
 
 25
Discontinued Nogales Transmission Project (6)
5
 
 
 5
Other Regulatory Assets (3)
14
 2
 
 16
Total Regulatory Assets—Noncurrent141
 8
 2
 151
Regulatory Liabilities—Current       
PGA (2)

 
 (15) (15)
RES (2)
(22) (9) 
 (31)
Other Current Regulatory Liabilities(2) (6) 
 (8)
Total Regulatory Liabilities—Current(24) (15) (15) (54)
Regulatory Liabilities—Noncurrent       
Net Cost of Removal for Interim Retirements (7)
(254) (12) (26) (292)
Income Taxes Payable through Future Rates(5) 
 (1) (6)
Deferred Investment Tax Credit (8)
(4) 
 
 (4)
Total Regulatory Liabilities—Noncurrent(263) (12) (27) (302)
Total Net Regulatory Assets (Liabilities)$(103) $(9) $(40) $(152)

K-99

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



 December 31, 2012
 TEP 
UNS
Electric
 
UNS
Gas
 
UNS
Energy
 Millions of Dollars
Regulatory Assets—Current       
Property Tax Deferrals (1)
$18
 $
 $
 $18
Derivative Instruments (Note 15)2
 6
 3
 11
PPFAC (2)
7
 8
 
 15
DSM (2)
5
 
 
 5
Other Current Regulatory Assets (3)
2
 
 1
 3
Total Regulatory Assets—Current34
 14
 4
 52
Regulatory Assets—Noncurrent       
Pension and Other Retiree Benefits (Note 10)130
 5
 4
 139
Income Taxes Recoverable through Future Revenues (4)
8
 2
 
 10
PPFAC—Final Mine Reclamation and Retiree Health Care Costs (5)
22
 
 
 22
Discontinued Nogales Transmission Project (6)
5
 
 
 5
Other Regulatory Assets (3)
13
 1
 1
 15
Total Regulatory Assets—Noncurrent178
 8
 5
 191
Regulatory Liabilities—Current       
PGA (2)

 
 (17) (17)
RES (2)
(19) (4) 
 (23)
Other Current Regulatory Liabilities(2) (1) (1) (4)
Total Regulatory Liabilities—Current(21) (5) (18) (44)
Regulatory Liabilities—Noncurrent       
Net Cost of Removal for Interim Retirements (7)
(231) (11) (25) (267)
Income Taxes Payable through Future Rates(5) 
 (1) (6)
Deferred Investment Tax Credit (8)
(5) 
 
 (5)
Other Regulatory Liabilities
 (1) 
 (1)
Total Regulatory Liabilities—Noncurrent(241) (12) (26) (279)
Total Net Regulatory Assets (Liabilities)$(50) $5
 $(35) $(80)
Regulatory assets are either being collected in Retail Rates or are expected to be collected through Retail Rates in a future period. We describe regulatory assets below. With the exception of interest earned on under-recovered PPFAC costs and the ECA, we do not earn a return on regulatory assets.
(1)
Property Tax is recovered over approximately a six-month period as costs are paid, rather than as costs are accrued.
(2)
See Cost Recovery Mechanisms discussion above.
(3)
TEP’s other regulatory assets include unamortized loss on reacquired debt (recovery through 2032), coal contract amendment (recovery through 2017), rate case costs (recovery over three years), environmental compliance costs, Springerville Unit 1 lease deferrals and other assets (recovery through 2014).
(4)
Income Taxes Recoverable through Future Revenues are amortized over the life of the assets.
(5)
Final Mine Reclamation and Retiree Health Care Costs stem from TEP’s jointly-owned facilities at the San Juan Generating Station, the Four Corners Generating Station, and the Navajo Generating Station. TEP is required to recognize the present value of its liability associated with final mine reclamation and retiree health care obligations over the life of the coal supply agreements. TEP recorded a regulatory asset because TEP is permitted to fully recover these costs through the PPFAC when the costs are invoiced by the miners. TEP expects to recover these costs over the remaining life of the mines, which is estimated to be between 14 and 20 years.
(6)
TEP and UNS Electric will request recovery from FERC for the prudent costs incurred to develop a high-voltage transmission line from Tucson to Nogales. TEP and UNS Electric are not going to proceed with the project. See Note 7.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Regulatory liabilities represent items that we either expect to pay to customers through billing reductions in future periods or plan to use for the purpose for which they were collected from customers, as describedcustomers. Regulatory assets and liabilities recorded on the Consolidated Balance Sheets are summarized below:
 December 31,
(in millions)2015 2014
Regulatory Assets   
Pension and Other Retiree Benefits (Note 8)$120
 $126
Final Mine Reclamation and Retiree Health Care Costs (1)
28
 29
Income Taxes Recoverable through Future Rates (2)
26
 31
Property Tax Deferrals (3)
21
 21
Springerville Unit 1 Leasehold Improvements - Third Party Owners (4)
21
 
LFCR and DSM16
 12
Derivatives (Note 11)12
 18
PPFAC
 19
Springerville Purchase Deferrals (5)

 16
Other Regulatory Assets20
 20
Total Regulatory Assets264
 292
Less Current Portion52
 69
Total Non-Current Regulatory Assets$212
 $223
Regulatory Liabilities   
Net Cost of Removal for Interim Retirements (6)
$264
 $265
Deferred Investment Tax Credits (7)
32
 41
RES25
 28
PPFAC18
 
Other Regulatory Liabilities21
 26
Total Regulatory Liabilities360
 360
Less Current Portion53
 39
Total Non-Current Regulatory Liabilities$307
 $321
(7)(1)
Final Mine Reclamation and Retiree Health Care Costs represent costs associated with TEP’s jointly-owned facilities at San Juan, Four Corners, and Navajo. TEP has the option to recognize its liability associated with final reclamation and retiree health care obligations at present or future value. TEP has elected to recognize these costs at future value and is permitted to fully recover these costs through the PPFAC when paid. TEP expects to make continuous payments through 2037.
(2)
Income Taxes Recoverable through Future Rates are amortized over the life of the assets. See Note 1 and Note 12 for additional information regarding income taxes.
(3)
Property taxes are recorded as a regulatory asset based on historical ratemaking treatment allowing regulated utilities to recover property taxes on a pay-as-you-go or cash basis. TEP records a liability to reflect the accrual for financial reporting purposes and an offsetting regulatory asset to reflect recovery for regulatory purposes. This asset is fully recovered in rates with a recovery period of approximately six months.
(4)
Upon expiration of Springerville Unit 1 capital leases in January 2015, TEP recorded a regulatory asset for unamortized leasehold improvement costs that relate to third-party ownership interests. These leasehold improvements, previously recorded in Plant in Service on the Consolidated Balance Sheets, represent investments TEP made through the end of the lease term to ensure that the Springerville Unit 1 facilities continued providing safe, reliable service to TEP's customers. In the 2013 Rate Order, TEP received ACC authorization to recover Springerville Unit 1 leasehold improvement costs over a 10-year amortization period.
(5)
TEP deferred the increase in lease interest expense relating to the purchase commitments for Springerville Unit 1 and the Springerville Coal Handling Facilities to a regulatory asset because TEP believes the full purchase price is recoverable in rate base. See Note 6 for additional information regarding the Springerville leases.

60


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



(6) 
Net Cost of Removal for Interim Retirements represents amounts recovered through depreciation rates associated withan estimate of the cost of future asset retirement costs expected to be incurred inobligations net of salvage value. These are amounts collected through revenue for the future.net cost of removal of interim retirements for transmission, distribution, generation plant, and general and intangible plant which are not yet expended.
(8)(7) 
TheAccumulated Deferred Investment Tax Credit relates to(ITC) represents federal energy credits generated in 2012 and isafter 2011 that are amortized over the tax life of the underlying asset.
IMPACTS OF REGULATORY ACCOUNTING
If we determine that we no longer meet the criteria for continued application of regulatory accounting, we would be required to write off our regulatory assets and liabilities related to those operations not meeting the regulatory accounting requirements. Discontinuation of regulatory accounting could have a material impact on our financial statements.


NOTE 4. BUSINESS SEGMENTS
We have 3.three reportable segments regularly reviewed by our chief operating decision makers to evaluate performance and make operating decisions.
(1)TEP, a regulated electric utility and our largest subsidiary
(2)UNS Electric, a regulated electric utility
(3)UNS Gas, a regulated gas distribution utility
We disclose selected financial data for our reportable segments in the following tables:
 Reportable Segments      
 TEP UNS Electric UNS Gas 
Other (2)
 
Reconciling
Adjustments
 
UNS
Energy
 Millions of Dollars
2013 
Income Statement 
Operating Revenues-External$1,180
 $174
 $131
 $2
 $(2) $1,485
Operating Revenues-Intersegment (1)
17
 2
 3
 17
 (39) 
Depreciation and Amortization149
 19
 9
 
 
 177
Interest Income
 1
 
 
 
 1
Interest Expense79
 7
 6
 1
 
 93
Income Tax Expense48
 7
 7
 (4) 
 58
Net Income101
 12
 11
 3
 
 127
Cash Flow Statement           
Capital Expenditures(253) (56) (17) 
 
 (326)
Balance Sheet           
Total Assets3,556
 404
 311
 1,194
 (1,192) 4,273

K-101

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



 Reportable Segments      
 TEP UNS Electric UNS Gas 
Other (2)
 
Reconciling
Adjustments
 
UNS
Energy
 Millions of Dollars
2012 
Income Statement 
Operating Revenues-External$1,145
 $189
 $129
 $
 $(1) $1,462
Operating Revenues-Intersegment (1)
17
 1
 4
 18
 (40) 
Depreciation and Amortization150
 18
 9
 
 
 177
Interest Income
 
 
 1
 
 1
Interest Expense88
 8
 6
 3
 
 105
Income Tax Expense39
 11
 6
 
 
 56
Net Income65
 17
 9
 
 
 91
Cash Flow Statement           
Capital Expenditures(253) (38) (16) 
 
 (307)
Balance Sheet           
Total Assets3,461
 370
 310
 1,121
 (1,122) 4,140
2011           
Income Statement           
Operating Revenues-External$1,141
 $188
 $149
 $
 $1
 $1,479
Operating Revenue-Intersegment (1)
15
 2
 2
 23
 (42) 
Depreciation and Amortization140
 17
 8
 1
 (1) 165
Interest Income4
 
 
 1
 
 5
Interest Expense89
 7
 7
 9
 
 112
Income Tax Expense52
 11
 7
 (1) (2) 67
Net Income85
 18
 10
 
 (3) 110
Cash Flow Statement           
Capital Expenditures(352) (96) (13) (34) 121
 (374)
(1)
Operating Revenues – Intersegment includes common costs (system, facilities, etc.) allocated to affiliates on a cost-causative basis and recorded as revenue by TEP, sales of power between TEP and UNS Electric at third-party market prices, control area services provided by TEP to UNS Electric based on a FERC-approved tariff, sales of gas by UNS Gas at third-party market prices for use in UNS Electric's generating facilities, and supplemental workforce charges charges (primarily meter reading services) provided to the utilities by an unregulated affiliate.
(2)
Other includes the UNS Energy and UES holding companies, Millennium, and UED.


K-102

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



NOTE 5. UTILITY PLANT AND JOINTLY-OWNED FACILITIES
UTILITY PLANT
The following table shows Utility Plant in Service by major class:
UNS Energy TEPDecember 31,
December 31, December 31,
2013 2012 2013 2012
Millions of Dollars
Plant in Service:       
(in millions)2015 2014
Plant in Service   
Electric Generation Plant$1,974
 $1,932
 $1,889
 $1,847
$2,612
 $2,388
Electric Transmission Plant912
 842
 825
 796
1,008
 890
Electric Distribution Plant1,529
 1,495
 1,298
 1,271
1,456
 1,398
Gas Distribution Plant252
 240
 
 
Gas Transmission Plant18
 18
 
 
General Plant356
 347
 312
 309
358
 338
Intangible Plant - Software Costs (1) (2)
142
 124
 141
 123
172
 149
Intangible Plant - Other5
 5
 
 
Intangible Plant - Transmission Rights and Other7
 8
Electric Plant Held for Future Use4
 3
 3
 2
5
 4
Total Plant in Service$5,192
 $5,006
 $4,468
 $4,348
$5,618
 $5,175
          
Utility Plant under Capital Leases(3)
$638
 $583
 $638
 $583
$132
 $667
(1) 
Unamortized computer software costs were $40$45 million for UNS Energy and $39$31 million for TEP as of December 31, 2013,2015 and $36 million for UNS Energy and $35 million for TEP as of December 31, 2012.2014, respectively.
(2) 
The amortization of computer software costs in UNS Energy’s and TEP's income statements was $14 million in 2013, $132015, $17 million in 2012,2014, and $10$14 million in 2011.2013.
(3) 
In 2013, TEP entered into agreements to purchasepurchased certain Springerville Unit 1facilities leased interests.interests in 2015 and 2014. See Note 6.6 for additional information regarding the Springerville leases.

TEP
61


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Utility Plant under Capital Leases
All TEP utility plant under capital leases is used in TEP’s generation operations and amortized over the primary lease term. See Note 6.6 for additional information regarding capital leases. At December 31, 2013,2015, the utility plant under capital leases includes: 1)represents an undivided one-half interest in certain Springerville Unit 1; 2) Springerville Common Facilities; and 3) Springerville Coal Handling Facilities. The following table shows the amount of lease expense incurred for TEP’s generation-related capital leases:
Years Ended December 31,Year Ended December 31,
2013 2012 2011
Millions of Dollars
Lease Expense:     
(in millions)2015 2014 2013
Lease Expense     
Interest Expense – Included in:          
Capital Leases25
 $34
 $40
$4
 $10
 $25
Operating Expenses – Fuel2
 3
 4

 1
 2
Other Expense
 
 1
Amortization of Capital Lease Assets – Included in:          
Operating Expenses – Fuel5
 4
 3
2
 6
 5
Operating Expenses – Amortization15
 14
 14
6
 16
 15
Total Lease Expense$47
 $55
 $62
$12
 $33
 $47
Utility plant depreciation rates and approximate average remaining service lives based on the most recent depreciation studies available for the major classes of Utility Plant in Service at December 31, 2013,2015, were as follows:

K-103

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



 TEP
 December 31, 2013
 
Annual Depreciation Rate (5)
 Average Remaining Life in Years
Major Class of Utility Plant in Service:   
Electric Generation Plant (1)
3.31% 22
Electric Transmission Plant1.48% 32
Electric Distribution Plant (1)
2.08% 35
General Plant (1)
5.48% 11
Intangible Plant (2)
Various Various
 UNS Electric
 December 31, 2013
 
Annual Depreciation Rate (5)
 Average Remaining Life in Years
Major Class of Utility Plant in Service:   
Electric Generation Plant2.56% 36
Electric Transmission Plant3.36% 19
Electric Distribution Plant3.97% 15
General Plant8.01% 7
Intangible Plant (3)
Various Various
 UNS Gas
 December 31, 2013
 
Annual Depreciation Rate (5)
 Average Remaining Life in Years
Major Class of Utility Plant in Service:   
Gas Generation Plant2.37% 41
Gas Transmission Plant1.54% 54
General Plant4.38% 7
Intangible Plant (4)
Various Various
 
Annual Depreciation Rate (1)
 Average Remaining Life in Years
Electric Generation Plant3.31% 22
Electric Transmission Plant1.48% 32
Electric Distribution Plant2.08% 35
General Plant5.48% 11
Intangible Plant (2)
Various Various
(1)
In June 2013, the ACC issued the 2013 TEP Rate Order that approved a change in depreciation rates which reflects changes in the remaining average useful lives for our generation, distribution, and general plant assets. See Note 3.
(2)
The majority of TEP's investment in intangible plant represents computer software, which is being amortized over its expected useful life based on either the average lives of 3 to 5 years for smaller application software or remaining lives ranging from 5 to 19 years for large enterprise software.
(3)
UNS Electric's intangible plant primarily represents capitalized interconnection costs, which are amortized based on either an average life of 23 years or a remaining life of 35 years.
(4)
UNS Gas' intangible plant consists of miscellaneous intangible assets, which are amortized over an average life of either 15 or 25 years.
(5) 
The depreciation rates represent a composite of the depreciation rates of assets within each major class of utility plant.
(2)
The majority of TEP's investment in intangible plant represents computer software. Computer software is being amortized over its expected useful life of three to five years for smaller application software and average remaining life of three to eight years for large enterprise software.
GILA RIVER ACQUISITION
In December 2014, TEP and UNS Electric, Inc. (UNS Electric) acquired Gila River Unit 3, a gas-fired combined cycle unit with a nominal capacity rating of 550 megawatts (MW) located in Gila Bend, Arizona, from a subsidiary of Entegra Power Group LLC. TEP purchased a 75% undivided interest in Gila River Unit 3 (413 MW) for $164 million, and UNS Electric purchased the remaining 25% undivided interest.
TEP’s purchase of Gila River Unit 3 was intended to replace the reduction of 195 MW of output from Springerville Unit 1 and the 170 MW of capacity expected to be retired at San Juan in 2017.
The transaction was accounted for using the acquisition method of accounting which requires that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. The following table summarizes the assets acquired and liabilities assumed as of the acquisition date:
(in millions) 
Utility Plant, Net$163
Materials and Supplies2
ARO Obligation Assumed (1)
(1)
Total Purchase Price$164
(1)
The ARO obligation was recorded at net present value in Regulatory and Other Liabilities - Other on TEP's Consolidated Balance Sheets.

K-10462

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



JOINTLY-OWNED FACILITIES
AtIn addition to Gila River Unit 3, at December 31, 2013, TEP’s interests2015, TEP was a participant in the following jointly-owned generating stations and transmission systems were as follows:systems:
Ownership Percentage Plant in Service 
Construction Work in
Progress
 Accumulated Depreciation Net Book Value
 Millions of Dollars
(in millions)Ownership Percentage Plant in Service 
Construction Work in
Progress
 Accumulated Depreciation Net Book Value
San Juan Units 1 and 250.0% $448
 $6
 $230
 $224
50.0% $486
 $12
 $251
 $247
Navajo Units 1, 2, and 37.5% 152
 1
 110
 43
7.5% 148
 2
 112
 38
Four Corners Units 4 and 57.0% 101
 2
 75
 28
7.0% 102
 9
 77
 34
Luna Energy Facility33.3% 53
 
 2
 51
33.3% 54
 
 
 54
Gila River Unit 375.0% 198
 2
 56
 144
Gila River Common Facilities18.8% 25
 
 7
 18
Springerville Unit 1 (1)
49.5% 319
 8
 174
 153
Springerville Coal Handling Facility (2)
65.9% 164
 1
 65
 100
Transmission FacilitiesVarious 330
 43
 190
 183
Various 383
 1
 172
 212
Total $1,084
 $52
 $607
 $529
 $1,879
 $35
 $914
 $1,000
(1)
TEP is obligated to operate the unit for the Third-Party Owners under existing agreements. The Owner Trustees and Co-Trustees are obligated to compensate TEP for their pro rata share of expenses. See Note 6 for additional information regarding the purchase of leased interest. See Note 7 for additional information regarding Springerville Unit 1.
(2)
TEP owns an additional 17.05% undivided interest in the Springerville Coal Handling Facilities classified as Assets Held for Sale on the Consolidated Balance Sheets. See Note 6 for additional information regarding the Springerville Coal Handling Facilities lease interests.
As participants in these jointly-owned facilities, we are responsible for itsour share of operating and capital costs for the above facilities as well as providing financing. TEP accountsfacilities. We account for itsour share of operating expenses and utility plant costs related to these facilities using proportionate consolidation.
RETIREMENTS
San Juan
In October 2014, the EPA published a final rule approving a State Implementation Plan (SIP) covering BART requirements for San Juan, which includes the closure of Units 2 and 3 by December 2017.  TEP is a participant in San Juan Unit 2. Given the closure of two units and the desire of certain participants to exit their ownership in San Juan, PNM and the other participants, including TEP, negotiated restructured ownership agreements which became effective upon the sale of San Juan Coal Company’s (SJCC) stock in January 2016. As a condition of the New Mexico Public Regulatory Commission’s (NMPRC) approval of the early retirement of San Juan Units 2 and 3, PNM is required to make a filing with the NMPRC in 2018 to demonstrate the ongoing economic viability of San Juan beyond 2022. Under the new restructured ownership agreements, TEP and the other remaining participants have the option to exit their remaining ownership interest in San Juan as of June 30, 2022.
At December 31, 2015, the net book value of TEP's share in San Juan Unit 2, including construction work in progress, was $104 million. Consistent with the 2013 Rate Order, TEP has requested authorization from the ACC to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case. See Note 2 for additional information regarding the 2015 Rate Case.
Sundt
In June 2014, the EPA issued a final rule that would require TEP to either: (i) install, by mid-2017, SNCR and dry sorbent injection if Sundt Unit 4 continues to use coal as a fuel source; or (ii) permanently eliminate coal as a fuel source as a better-than-BART alternative by the end of 2017. Under the rule, TEP is required to notify the EPA of its decision by March 2017.
At December 31, 2015, the net book value of the Sundt coal handling facilities was $16 million. In August 2015, TEP exhausted its existing coal supply at Sundt and has been operating Sundt with natural gas as a primary fuel source. TEP expects to retire the Sundt coal handling facilities earlier than expected, and has requested to apply excess depreciation reserves against the unrecovered net book value in its 2015 Rate Case. See Note 2 for additional information regarding the 2015 Rate Case.

63


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



ASSET RETIREMENT OBLIGATIONS
The accrual of AROs is primarily related to generation and photovoltaic assets and is included in Deferred CreditsRegulatory and Other Liabilities on the balance sheets.Consolidated Balance Sheets. The following table reconciles the beginning and ending aggregate carrying amounts of ARO accruals on the balance sheets:Consolidated Balance Sheets:
UNS EnergyDecember 31,
December 31,
2013 2012
Millions of Dollars
Beginning Balance$14
 $13
(in millions)2015 2014
Beginning of Period$28
 $22
Liabilities Incurred1
 
4
 5
Accretion Expense or Regulatory Deferral1
 1
1
 1
Revisions to the Present Value of Estimated Cash Flows (1)
7
 
(1) 
Ending Balance$23
 $14
End of Period$32
 $28
(1)
Primarily related to changes in expected cost estimates, in conjunction with changes of asset retirement dates of generating facilities.

NOTE 4. ACCOUNTS RECEIVABLE
The following table above primarily reflectspresents the components of Accounts Receivable, Net on the Consolidated Balance Sheets:
 December 31,
(in millions)2015 2014
Customer$79
 $78
Due from Affiliates (Note 5)7
 5
Unbilled39
 37
Other39
 17
Allowance for Doubtful Accounts (1)
(27) (5)
Accounts Receivable, Net$137
 $132
(1)
The Allowance for Doubtful Accounts increased in 2015 due to the Third-Party Owners' claims at Springerville Unit 1. See Note 7 for additional information regarding the Third-Party Owners' claims.

NOTE 5. RELATED PARTY TRANSACTIONS
TEP engages in various transactions with Fortis, UNS Energy and its affiliated subsidiaries including Unisource Energy Services, Inc. (UES), UNS Electric, UNS Gas, Inc. (UNS Gas) and Southwest Energy Solutions, Inc. (SES) (collectively, UNS Energy affiliates). These transactions include the sale and purchase of power and transmission services, common cost allocations, and the provision of corporate and other labor related services.

64


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



The following table presents the components of related party balances included in Accounts Receivable, Net and Accounts Payable on the Consolidated Balance Sheets:
 December 31,
(in millions)2015 2014
Receivables from Related Parties   
UNS Electric$6
 $4
UNS Gas1
 1
Total Due from Related Parties$7
 $5
    
Payables to Related Parties   
SES$2
 $2
UNS Electric2
 1
UNS Energy2
 
Total Due to Related Parties$6
 $3
The following table presents the components of related party transactions included on the Consolidated Statements of Income:
 Year Ended December 31,
(in millions)2015 2014 2013
Wholesale Sales - TEP to UNS Electric (1)
$8
 $4
 $1
Wholesale Sales - UNS Electric to TEP (1)
1
 4
 2
Control Area Services - TEP to UNS Electric (2)
2
 3
 4
Common Costs - TEP to UNS Energy Affiliates (3)
12
 13
 12
Supplemental Workforce - SES to TEP (4)
16
 16
 16
Corporate Services - UNS Energy to TEP (5)
7
 14
 5
Corporate Services - UNS Energy Affiliates to TEP (6)
1
 1
 1
(1)
TEP and UNS Electric sell power and transmission services to each other at prevailing market prices.
(2)
TEP charges UNS Electric for control area services under a FERC-approved Control Area Services Agreement.
(3)
Common costs (information systems, facilities, etc.) are allocated on a cost-causative basis and recorded as revenue by TEP. The method of allocation is deemed reasonable by management and is reviewed by the ACC as part of the rate case process.
(4)
SES provides supplemental workforce and meter-reading services to TEP based on related party service agreements. The charges are based on cost of services performed and deemed reasonable by management.
(5)
Costs for corporate services at UNS Energy include Fortis management fees, legal fees, and audit fees which are allocated to its subsidiaries using the Massachusetts Formula, an industry accepted method of allocating common costs to affiliated entities. TEP's allocation is approximately 81% of UNS Energy's allocated costs. In 2015, these costs included approximately $5 million in Fortis management fees, which began in January 2015 following the August 2014 acquisition. In 2014, these costs included approximately $12 million in acquisition-related costs (excluding TEP allocated labor related charges).
(6)
Costs for corporate services (e.g., finance, accounting, tax, legal, and information technology) and other labor services for UNS Energy Affiliates are directly assigned to the benefiting entity at a fully burdened cost when possible.
CONTRIBUTION FROM PARENT
In June 2015, UNS Energy made an equity contribution to TEP of $180 million. TEP used proceeds from the equity contribution to repay the outstanding balances under TEP's ARO obligations.revolving credit facilities. The remaining balance of the proceeds was used to redeem bonds in August 2015 and to provide additional liquidity to TEP. See Note 6for additional information regarding the August 2015 bond redemption. TEP received contributions of $225 million from UNS Electric's ARO obligations were lessEnergy in 2014 and no contributions in 2013.
DIVIDEND PAID
TEP declared and paid $50 million in dividends to UNS Energy in 2015 and $40 million in 2014 and 2013.

65


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



The ACC's approval of the acquisition of UNS Energy by Fortis, in August 2014, contained a condition restricting subsidiary dividend payments to UNS Energy by TEP to no more than $1 million at60 percent of TEP's annual net income for the earlier of five years or until such time that TEP's equity capitalization reaches 50 percent of total capital as accounted for in accordance with GAAP. The ratios used to determine the dividend restrictions will be calculated for each calendar year and reported to the ACC annually beginning on April 1, 2016. As of December 31, 20132015, TEP had not reached the 50 percent of total capital and 2012.was therefore still restricted by the condition contained in the ACC's approval order.


NOTE 6. DEBT, CREDIT FACILITIES, AND CAPITAL LEASE OBLIGATIONS
LONG-TERM DEBT
Long-term debt matures more than one year from the date of the financial statements. We summarize UNS Energy’s and TEP’s long-term debt inThe following table presents the statementscomponents of capitalization.Long-Term Debt on the Consolidated Balance Sheets:
UNS ENERGY CONVERTIBLE SENIOR NOTES
(dollars in millions)     December 31,
Debt (1)
 Interest Rate 
Maturity Date (3)
 2015 2014
Notes        
2011 Notes 5.15% 2021 $250
 $250
2012 Notes 3.85% 2023 150
 150
2014 Notes 5.00% 2044 150
 150
2015 Notes 3.05% 2025 300
 
Tax Exempt Local Furnishings Bonds        
1982 Pima A Irvington Project 
Reset Weekly (2)
 2022 
 39
1982 Pima A TEP Projects 
Reset Weekly (2)
 2022 
 40
2008 Pima B 5.75% 2029 
 130
2010 Pima A 5.25% 2040 100
 100
2012 Pima A 4.50% 2030 16
 16
2013 Pima A 4.00% 2029 91
 91
2013 Apache A 
Reset Monthly (2)
 2032 100
 100
Tax Exempt Pollution Control Bonds        
2009 Pima A 4.95% 2020 80
 80
2009 Coconino A 5.13% 2032 15
 15
2010 Coconino A 
Reset Weekly (2)
 2032 37
 37
2012 Apache A 4.50% 2030 177
 177
Total Long-Term Debt     1,466
 1,375
Less Unamortized Discount and Debt Issuance Costs     14
 13
Total Long-Term Debt, Net     $1,452
 $1,362
In 2005, UNS Energy issued $150 million of 4.50% Convertible Senior Notes due in 2035. In 2012, UNS Energy converted approximately $147 million of the Convertible Senior Notes into approximately 4.3 million shares of Common Stock and redeemed $3 million for cash.
TEP DEBT ISSUANCES AND REDEMPTIONS
Unsecured Tax-Exempt Variable Rate Bonds
In November 2013, the Industrial Development Authority of Apache County, Arizona issued $100 million of tax-exempt, variable rate Industrial Development Revenue Bonds (IDRBs), due April 2032. The lender resets the interest rate monthly based on a percentage of an index rate equal to one-month LIBOR plus a bank margin rate; the rate at December 31, 2013 was
(1)
As of December 31, 2015, all of TEP's debt is unsecured, with the exception of the 2010 Coconino A variable rate bonds, which are backed by a LOC.
(2)
For variable rate debt for which rates are reset weekly, the weighted average rate (including LOC fees and remarketing fees) was 1.24% in 2015 and 1.46% in 2014. The average weekly interest rate ranged from 0.93% - 1.42% in 2015 and 1.40% - 1.75% during 2014. For variable rate debt for which rates are reset monthly, the rate is based on a percentage of an index equal to one-month London Interbank Offered Rate (LIBOR) plus a credit spread. The average monthly rate was 0.81% in 2015 and 0.87% in 2014. The monthly interest rate ranged from 0.79% - 0.87% in 2015 and 0.85% - 0.95% in 2014.
(3)
The 2010 Coconino A variable rate bonds are backed by an LOC issued pursuant to the 2010 Reimbursement Agreement, which expires in December 2019. The 2013 Apache A variable rate bonds are subject to mandatory tender for purchase in 2018.

K-10566

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



0.948% per annum. These bonds areDEBT ISSUANCES AND REDEMPTIONS
Fixed Rate Debt
In February 2015, TEP issued and sold $300 million aggregate principal amount of senior unsecured notes. TEP may redeem the notes prior to December 2024, with a make-whole premium plus accrued interest. On or after December 2024, TEP may redeem the notes at par plus accrued interest.
In January 2015, TEP purchased $130 million aggregate principal amount of unsecured tax exempt Industrial Development Revenue Bonds (IDRBs) issued in June 2008 by the Industrial Development Authority (IDA) of Pima County, Arizona for the benefit of TEP. The multi-modal bonds mature in September 2029. At December 31, 2015, TEP had not remarketed the repurchased bonds and the initial term is set at five years through November 2018, at which timeas a result the bonds will be subjectwere not recorded in Long-Term Debt on the Consolidated Balance Sheets.
In March 2014, TEP issued and sold $150 million of unsecured notes. TEP may redeem the notes prior to mandatory tender for purchase. Proceeds were depositedSeptember 2043, with a trustee tomake-whole premium plus accrued interest. After September 2043, TEP may redeem $100 million variable rate bonds in December 2013.the notes at par plus accrued interest.
Secured Tax-Exempt Variable Rate Bonds and Interest Rate Swap
Certain of TEP's tax-exempt, variable rate bonds are secured by Letter of Credits (LOCs) issued under the TEP Credit Agreement and TEP Reimbursement Agreement, see below.
The following table shows interest rates on TEP’s weekly variable rate bonds, which are reset weekly by its remarketing agents:
 Years Ended December 31,
 2013 2012 2011
Interest Rates on Bonds:     
Average Interest Rate0.10% 0.17% 0.18%
Range of Average Weekly Rates0.06% - 0.25% 0.06% - 0.26% 0.05% - 0.34%
Debt
In August 2009,2015, TEP entered intoredeemed two series of variable rate tax-exempt bonds at par with an aggregate principal amount of $79 million prior to maturity. In September 2015, TEP terminated the associated LOCs issued under a revolving credit facility.
In September 2014, TEP's interest rate swap thatentered into in August 2009 expired. The interest rate swap had the economic effect of converting $50 million of variable rate bonds to a fixed rate of 2.4%2.40% from September 2009 to September 2014.
Unsecured Tax-Exempt Fixed Rate Bonds
In March 2013, TEP issued approximately $91 million aggregate principal amount of Pima County, Arizona, unsecured tax-exempt Industrial Development Bonds (IDBs). The bonds bear interest at a fixed rate of 4.0%, mature in September 2029, and may be redeemed at par on or after March 1, 2023. The proceeds from the sale of the bonds were deposited with a trustee to retire approximately $91 million of 6.375% unsecured tax-exempt bonds in April 2013.CREDIT AGREEMENTS
In June 2012,October 2015, TEP issued approximately $16 million of Pima County, Arizona,entered into an unsecured tax-exempt IDBs.credit agreement (2015 Credit Agreement) replacing the 2010 Credit Agreement. The bonds bear interest at a fixed rate of 4.5%, mature in June 2030, and may be redeemed at par on or after June 1, 2022. The proceeds from the sale of the bonds were deposited with a trustee to retire approximately $16 million of unsecured, tax-exempt bonds with interest rates of 5.85% and 5.875%, and maturity dates ranging from 2026 to 2033.
In March 2012, TEP issued $177 million of Apache County, Arizona, unsecured, tax-exempt pollution control bonds. The bonds bear interest at a fixed rate of 4.5%, mature in March 2030, and may be redeemed at par on or after March 1, 2022. The proceeds from the sale of the bonds, together with $7 million of principal and $1 million for accrued interest provided by TEP, were deposited with a trustee to retire $184 million of unsecured tax-exempt bonds with interest rates of 5.85% and 5.875% and maturity dates ranging from 2026 to 2033.
Unsecured Fixed Rate Notes
In September 2012, TEP issued $150 million of 3.85% unsecured notes due March 2023. TEP may call the debt prior to December 15, 2022, with a make-whole premium plus accrued interest. After December 15, 2022, TEP may call the debt at par plus accrued interest. The unsecured notes contain a limitation on the amount of secured debt that TEP may have outstanding. TEP used the net proceeds to repay approximately $72 million outstanding on the revolving credit facility, with the remaining proceeds used for general corporate purposes.
TEP MORTGAGE INDENTURE
Prior to November 2013, the TEP2015 Credit Agreement and the 2010 TEP Reimbursement Agreement were secured by $423 million in mortgage bonds issued under the 1992 Mortgage. Asprovides for a result of TEP's credit rating upgrade, in October 2013, TEP canceled $423 million in mortgage bonds and discharged the 1992 Mortgage, which had created a lien on and security interest in substantially all of TEP’s utility plant assets. TEP’s obligations under the TEP Credit Agreement and the 2010 TEP Reimbursement Agreement are now unsecured.
UNS ENERGY CREDIT AGREEMENT
The UNS Energy Credit Agreement consists of a $125$250 million revolving credit facilitycommitment and revolving LOC facility and expires in November 2016. UNS Energy’s obligationsfacility. The LOC sublimit is $50 million. TEP expects that amounts borrowed under the credit agreement are secured by a pledgewill be used for working capital and other general corporate purposes and that LOCs will be issued from time to time to support energy procurement and hedging transactions. All amounts outstanding under the facility will be due in October 2020, the termination date. The 2015 Credit Agreement allows for two one-year extensions of the capital stock of Millennium, UES, and UED.
UNS Energy had $54 million of outstanding borrowings at December 31, 2013 and $45 million of outstanding borrowings at December 31, 2012, under its revolving credit facility. The weighted average interest rate on the revolver was 1.66% at

K-106

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



December 31, 2013 and 1.96% at December 31, 2012. We report the revolver borrowings in Long-Term Debt on the balance sheet as UNS Energy has the ability and the intent to have outstanding borrowings for the next twelve months. As of February 14, 2014, outstanding borrowings under the UNS Energy Credit Agreement totaled $52 million.facility if certain conditions are satisfied.
Interest rates and fees under the UNS Energy Credit Agreement are based on a pricing grid tied to UNS Energy’s credit ratings. The interest rate currently in effect on borrowings is LIBOR plus 1.25% for Eurodollar loans or Alternate Base Rate plus 0.25% for Alternate Base Rate loans.
TEP CREDIT AGREEMENT
The TEP Credit Agreement consists of a $200 million revolving credit, revolving LOC facility, and a $82 million LOC facility to support tax-exempt bonds, and expires in November 2016. In December 2013, TEP reduced its letter of credit facility from $186 million to $82 million, following the refinancing of $100 million of variable rate bonds and the cancellation of $104 million of LOCs supporting those bonds.
Interest rates and fees under the TEP2015 Credit Agreement are based on a pricing grid tied to TEP’s credit ratings. The interest rate currently in effect on borrowings is LIBOR plus 1.125%1.00% for Eurodollar loans or Alternate Base Rate plus 0.125%with no spread for Alternate Base Rate loans. The margin rate currently in effect on the $82 million LOC facility is 1.125%.
At December 31, 2015, TEP had no borrowings and $1 million outstanding in LOCs issued under its revolving credit facility at December 31, 2013 and December 31, 2012. The revolving loan balance was included in Current Liabilities on UNS Energy’s and TEP’s balance sheets. The outstanding LOCs are off-balance sheet obligations of TEP.the Consolidated Balance Sheets. As of February 14,17, 2016, there was $250 million available under the 2015 Credit Agreement's revolving credit and LOC facilities.
In 2015, TEP terminated both the 2010 and 2014 Credit Agreements. The amended 2010 Credit Agreement provided for a $200 million revolving credit commitment and LOCs supporting variable-rate, tax-exempt bonds, with an expiration date of November 2016. The 2014 Credit Agreement, entered into in December 2014, provided for a $130 million term loan commitment and a $70 million revolving credit commitment, with an expiration date of November 2015. At December 31, 2014, TEP had $90$85 million in total borrowings and $1 million outstanding under these agreements which were included in LOCs under its revolving credit facility.Current Liabilities on the Consolidated Balance Sheets.
2010 TEP REIMBURSEMENT AGREEMENT
AIn December 2010, a $37 million LOC was issued to support certain variable rate tax-exempt bonds pursuant to the 2010 TEP Reimbursement Agreement. The LOC supports $37 million aggregate principal amounthad an expiration date of variable rate tax-exempt bonds that were issued on behalf of TEP in December 2010.2014. In February 2014, TEPthe LOC was amended the agreement to extend the LOC expiration date from 2014 to 2019. Fees are payable on the aggregate outstanding amount of the LOC at a rate of 1.00%0.75% per annum.
UNS ELECTRIC/UNS GAS CREDIT AGREEMENT
The UNS Electric/UNS Gas Credit Agreement consists of a $100 million revolving credit and revolving LOC facility, and expires in November 2016. The maximum borrowings outstanding at any one time for UNS Gas or UNS Electric under the agreement may not exceed $70 million. UNS Electric and UNS Gas each are liable for only their own individual borrowings under the UNS Electric/UNS Gas Credit Agreement. UES guarantees the obligations of both UNS Electric and UNS Gas. The UNS Electric/UNS Gas Credit Agreement may be used to issue LOCs, as well as for revolver borrowings. UNS Electric and UNS Gas issue LOCs, which are off-balance sheet obligations, to support power and gas purchases and hedges.
Interest rates and fees under the UNS Electric/UNS Gas Credit Agreement areannum based on a pricing grid tied to theirTEP's current credit ratings. The interest rate currently in effect on borrowings is LIBOR plus 1.125% for Eurodollar loans or Alternate Base Rate plus 0.125% for Alternate Base Rate loans.
UNS Electric had $22 million in borrowings and less than $0.5 million in outstanding LOCs under the UNS Electric/UNS Gas Credit Agreement as of December 31, 2013. The revolving loan balance was included in Current Liabilities on UNS Energy’s balance sheet. UNS Electric had no borrowings outstanding and less than $0.5 million LOCs under UNS Electric/UNS Gas Credit Agreement as of December 31, 2012. The oustanding LOCs balances are not shown on the balance sheet. As of February 14, 2014, UNS Electric had $25 million in borrowings and less than $0.5 million in outstanding LOCs under the UNS Electric/UNS Gas Credit Agreement.
UNS ELECTRIC TERM LOAN CREDIT AGREEMENT AND INTEREST RATE SWAP
In August 2011, UNS Electric entered into a four-year $30 million variable rate term loan credit agreement. The interest rate currently in effect is three-month LIBOR plus 1.125%. At the same time, UNS Electric entered into a fixed-for-floating interest rate swap in which UNS Electric will pay a fixed rate of 0.97% and receive a three-month LIBOR rate on a $30 million notional amount over a four years period ending August 2015. The UNS Electric term loan credit agreement, included in Long-Term Debt on the balance sheet, is guaranteed by UES.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



COVENANT COMPLIANCE
OurCertain of our credit agreements, the 2010 TEP Reimbursement Agreement, and certain of our long-term debt agreements contain restrictive covenants, including restrictions on additional indebtedness, liens to secure indebtedness, mergers, sales of assets, transactions with affiliates, and restricted payments. The UNS Energy Credit Agreement also requires UNS Energy to meet a minimum cash flow to interest coverage ratio, and each of our credit agreements stipulate a maximum leverage ratio. UNS Energy and its subsidiaries may pay dividends so long as we maintain compliance with our credit agreements.
At December 31, 2013,2015, we were in compliance with the terms of our long-term debt, credit agreements,2015 Credit Agreement, 2013 Covenants Agreement, and the 2010 TEP Reimbursement Agreement. No amounts of net income were subject to dividend restrictions.

67


TEP NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



CAPITAL LEASE OBLIGATIONS
In January 2014, through scheduled lease payments, TEP reduced its capital lease obligations by $80 million.The following table details Capital Lease Obligation on TEP's Consolidated Balance Sheets:
 December 31,
(in millions)2015 2014
Springerville Unit 1$
 $43
Springerville Coal Handling Facilities
 117
Springerville Common Facilities69
 83
Total Capital Lease Obligations69
 243
Less Current Obligations Under Capital Leases14
 174
Total Capital Lease Obligations, Net$55
 $69
Springerville Unit 1 Capital Lease Purchase CommitmentsPurchases
TheIn December 2014, TEP purchased a 10.6% leased interest in Springerville Unit 1 Leases have an initial term torepresenting 41 MW of capacity for the appraised value of $20 million. In January 2015, and include a fair market value purchase option at the endupon expiration of the initial lease term. In 2011,term, TEP and the owner participants of Springerville Unit 1 completed a formal appraisal procedure to determine the fair market value purchase price of Springerville Unit 1 in accordance with the Springerville Unit 1 Leases. The purchase price was determined to be $478 per kW of capacity based on a capacity rating of 387 MW.
In August 2013, TEP elected to purchasepurchased leased interests comprising 24.8% of Springerville Unit 1, representing 96 MW of capacity, for an aggregate purchase price of $46$46 million,, the appraised value, upon the expirationvalue. Upon purchase of the lease term in January 2015.
In October 2013,leased interests, TEP elected to purchase an additional 10.6% leased interest in Springerville Unit 1, representing 41 MW of capacity,reduced Capital Lease Obligations on the Consolidated Balance Sheets for$20 million, the appraised value, with the purchase scheduled to occur in December 2014.price.
Upon closeWith the completion of these lease optionthe purchases, TEP will own owns 49.5% of Springerville Unit 1, or 192 MW of capacity. DueTEP is obligated to TEP'soperate the unit for the Third-Party Owners under existing agreements. The Owner Trustees and Co-Trustees are obligated to compensate TEP for their pro rata share of expenses. See Note 7 for more information regarding claims relating to Springerville Unit 1.
Springerville Coal Handling Facilities Lease Purchase
In April 2015, upon expiration of the lease, TEP purchased an 86.7% undivided ownership interest in the Springerville Coal Handling Facilities at the fixed purchase commitments,price of $120 million, bringing its total ownership of the assets to 100%. Upon purchase of the leased interest, TEP and UNS Energy recorded an increase of approximately $55 million to both Utility Plant Under Capital Leases andreduced Capital Lease Obligations on their balance sheets.the Consolidated Balance Sheets for the purchase price.
In May 2015, SRP, the owner of Springerville Coal Handling and Common Facilities Leases
TheUnit 4, purchased from TEP a 17.05% undivided interest in the Springerville Coal Handling Facilities Leases have an initial termfor approximately $24 million.
Tri-State, the lessee of Springerville Unit 3, is obligated to either: (i) buy a 17.05% undivided interest in the facilities for approximately $24 million; or (ii) continue to make payments to TEP for the use of the facilities. Tri-State has until April 2016 to exercise its purchase option. At December 31, 2015, and provideTri-State's 17.05% undivided interest in the Springerville Coal Handling Facilities is classified as Assets Held for fixed-rate lease renewal options if certain conditions are satisfied as well as a fixed-price purchase provision of $120 million. The leases provide for one renewal period of six years beginning in April 2015, with additional renewal periods of five or more years through 2035.Sale on the Consolidated Balance Sheets.
Springerville Common Facilities Leases
The Springerville Common Facilities Leases have an initial term to December 2017 for one lease and January 2021 for the other two leases, subject to optional renewal periods of two or more years through 2025. Instead of extending the leases, TEP may also exercise a fixed-price purchase provision. The fixed prices for the acquisition of the interests in the common facilities are $38 million in 2017 and $68 million in 2021.
TEP agreedentered into agreements with Tri-State, the ownerlessee of Springerville Unit 3, and SRP, the owner of Springerville Unit 4, that contain the following conditions if the Springerville Coal Handling Facilities and Common Facilities Leases are not renewed, renewed:
TEP will exercise the purchase options under these contracts. contracts;
SRP will then be obligated to buy a portion of these facilitiesfacilities; and
Tri-State will then be obligated to either: (i) buy a portion of these facilities; or (ii) continue making payments to TEP for the use of these facilities.
Lease Debt and Equity
Investments in Springerville Lease Debt and Equity
In January 2013, TEP received the final maturity payment of $9 million on the investment in Springerville Unit 1 lease debt. TEP also heldentered into an undivided equity ownership interest in the Springerville Unit 1 Leases totaling $36 million at December 31, 2013 and December 31, 2012.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Interest Rate Swaps—Springerville Common Facilities Lease Debt
TEP’s interest rate swaps hedgeswap in 2006 that hedges a portion of the floating interest rate risk associated with the Springerville Common Facilities lease debt. Interest on the lease debt is payable at six-month London Interbank Offered Rate (LIBOR) plus a spread. The applicable spread was 1.75% at December 31, 2013 and December 31, 2012.
The swaps haveswap has the effect of fixing the interest ratesbenchmark LIBOR rate on a portion of the amortizing principal balances as follows:balance. The swap matures in January 2020 with interest on the lease debt payable at a swapped rate of

68

Lease Debt Outstanding at December 31, 2013
Fixed
Rate
 
LIBOR
Spread
Swap 1 - Notional Amount $33 million - Effective Date June 20065.77% 1.75%
Swap 2 - Notional Amount $16 million - Effective Date May 20093.18% 1.75%
Swap 3 - Notional Amount $6 million - Effective Date May 20093.32% 1.75%

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



5.77% plus an applicable margin per the lease agreement. The lease debt outstanding at December 31, 2015 consisted of a notional amount of $29 million on which interest was fixed by the swap and a notional amount of $13 million of debt that was not hedged. The applicable margin was 1.88% and 1.75% at December 31, 2015 and 2014, respectively.
TEP recorded thesethe interest rate swapsswap as a cash flow hedge for financial reporting purposes. See Note 15.11 for additional information.
DEBT MATURITIES
Long-term debt, including term loan payments, revolving credit facilities classified as long-term, and capital lease obligations mature on the following dates:
TEP
Long-Term
Debt
Maturities (1)
 
TEP
Capital
Lease
Obligations
 
TEP
Total
 UNS
Electric
 
UNS
Gas
 
UNS
Energy
Parent
Company
 Total
Millions of Dollars
2014$
 $214
 $214
 $
 $
 $
 $214
2015
 69
 69
 80
 50
 
 199
(in millions)
Long-Term
Debt
Maturities (1)
 
Capital
Lease
Obligations
 

Total (2)
201678
 17
 95
 
 
 54
 149
$
 $15
 $15
2017
 18
 18
 
 
 
 18

 16
 16
2018100
 11
 111
 
 
 
 111
100
 11
 111
Total 2014 – 2018178
 329
 507
 80
 50
 54
 691
201937
 11
 48
202080
 18
 98
Total 2016 - 2020217
 71
 288
Thereafter1,046
 30
 1,076
 50
 50
 
 1,176
1,249
 
 1,249
Less: Imputed Interest
 (42) (42) 
 
 
 (42)
 (2) (2)
Total$1,224
 $317
 $1,541
 $130
 $100
 $54
 $1,825
$1,466
 $69
 $1,535
(1) 
$11537 million of TEP’s variable rate bonds are backed by LOCsan LOC issued pursuant to TEP’s Credit Agreement, which expires in November 2016, and TEP’sthe 2010 Reimbursement Agreement, which expires in December 2019. Although the variable rate bonds mature between 2022 andbond matures in 2032, the above table reflects a redemption or repurchase of such bondsbond in 2016 and 2019 as though the LOCs terminateLOC terminates without replacement upon expiration of the TEP Credit2010 Reimbursement Agreement. TEP's 2013 tax-exempt variable rate IDBs,IDRBs, which have an aggregate principal amount of $100 million and mature in 2032, are subject to mandatory tender for purchase after the current five-year term and are therefore reflected as maturing in 2018.
(2) The repayment of TEP Unsecured Notes
Total long-term debt is not reduced by the approximately $1$11 million of related unamortized debt issuance costs and $3 million of unamortized original issue discount.



K-109

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



NOTE 7. COMMITMENTS CONTINGENCIES, AND ENVIRONMENTAL MATTERSCONTINGENCIES
COMMITMENTS
At December 31, 2013, UNS Energy and2015, TEP had the following firm, non-cancelable, minimum purchase obligations and operating leases. UNS Energy's commitments represent the obligations of TEP, UNS Electric, and UNS Gas:
 UNS Energy Purchase Commitments
 2014 2015 2016 2017 2018 Thereafter Total
 Millions of Dollars
Fuel, Including Transportation$103
 $83
 $80
 $75
 $49
 $345
 $735
Purchased Power75
 17
 
 
 
 
 92
Transmission7
 13
 12
 12
 11
 27
 82
Renewable Power Purchase Agreements36
 37
 37
 37
 37
 485
 669
RES Performance-Based Incentives9
 9
 9
 9
 9
 85
 130
Operating Leases4
 4
 3
 2
 2
 14
 29
   Total Purchase Commitments$234
 $163
 $141
 $135
 $108
 $956
 $1,737
At December 31, 2013, TEP had the following firm, non-cancelable,non-cancellable, minimum purchase obligations and operating leases:
TEP Purchase Commitments
2014 2015 2016 2017 2018 Thereafter Total
Millions of Dollars
(in millions)2016 2017 2018 2019 2020 Thereafter Total
Fuel, Including Transportation$77
 $63
 $64
 $62
 $36
 $285
 $587
$78
 $76
 $49
 $49
 $41
 $287
 $580
Purchased Power27
 5
 
 
 
 
 32
28
 
 
 
 
 
 28
Transmission3
 6
 6
 6
 6
 21
 48
6
 6
 6
 4
 3
 13
 38
Renewable Power Purchase Agreements30
 31
 31
 31
 31
 410
 564
61
 61
 61
 61
 60
 750
 1,054
RES Performance-Based Incentives8
 8
 8
 8
 8
 83
 123
8
 8
 8
 8
 8
 67
 107
Operating Leases3
 3
 2
 2
 2
 14
 26
Operating Leases:             
Land Easements and Rights-of-Way1
 1
 1
 1
 1
 77
 82
Operating Leases Other1
 1
 1
 1
 1
 4
 9
Total Purchase Commitments$148
 $116
 $111
 $109
 $83
 $813
 $1,380
$183
 $153
 $126
 $124
 $114
 $1,198
 $1,898
Fuel, Including Transportation
TEP has long-term contracts for the purchase and delivery of coal with various expiration dates through 2031. Amounts paid under these contracts depend on actual quantities purchased and delivered. Some of these contracts include a price adjustment

69


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



clause that will affect the future cost. TEP expects to spend more than the minimum purchase obligations to meet its fuel requirements. TEP's fuel costs are recoverable from customers through the PPFAC.
UNS Gas purchases gas from various suppliesContemporaneously with the sale of SJCC's stock in January 2016, the existing coal sale agreement terminated and a new Coal Supply Agreement (CSA) became effective. The new CSA is between SJCC and PNM and continues through June 30, 2022. TEP is not a party to the new CSA, but has minimum purchase obligations under restructured ownership agreements at market prices. However, UNS Gas' risk of loss due to increased costs is mitigated through the use of the PGA, which provides for the pass-through of actual commodity costs to customers. UNS Gas' forward gas purchase agreements expire through 2016. Certain of these contracts are at a fixed price per Million British Thermal Units (MMbtu) and others are indexed to natural gas prices. The commitment amountsSan Juan. Estimated future payments, not included in the table above, are based on projected marked prices as$21 million in 2016, $23 million in 2017, $24 million in 2018 and 2019, $23 million in 2020, and $22 million through the end of December 31, 2013. UNS Gasthe contract.
TEP has firm transportation agreements with capacity sufficient to meet its load requirements. These contracts expire in various years between 2016 and 2023.2040.
Purchased Power and Transmission
TEP and UNS Electric havehas agreements with utilities and other energy suppliers for purchased power to meet system load and energy requirements, replace generation from company-owned units under maintenance and during outages, and meet operating reserve obligations. In general, these contracts provide for capacity payments and energy payments based on actual power taken under the contracts. These contracts and expire in 2014 and 2015.2016. Certain of these contracts are at a fixed price per MW and others are indexed to natural gas prices. The commitment amounts included in the table are based on projected market prices as of December 31, 2013.2015.


K-110

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



TEP has agreements with other utilities to provide transmission services.services over lines that are part of the Western Interconnection, a regional grid in the United States. These contracts expire in various years between 2018 and 2028. UNS Electric imports the power it purchases over the Western Area Power Administration's (WAPA) transmission lines. UNS Electric's transmission capacity agreements with WAPA provide for annual rate adjustments and expire in 2016.
TEP's and UNS Electric's purchased power and transmission costs are recoverable from customers through their respectivethe PPFAC mechanisms.mechanism.
Renewable Power Purchase Agreements and RES Performance-Based Incentives
TEP and UNS Electric have enteredenters into 20 year Renewable Power Purchase Agreements (PPAs)long-term renewable power purchase agreements which require TEP and UNS Electric to purchase 100% of the output of certain renewable energy generation facilities that have achievedoutput once commercial operation.operation status is achieved. While TEP has entered into additional long-term renewable PPAsis not required to comply with RES requirements; however, TEP’s obligation to purchase powermake payments under these agreements doescontracts if power is not begin untildelivered, the facilities are operational.table above includes estimated future payments based on expected power deliveries. A portion of the cost of renewable energy is recoverable through the PPFAC, with the balance of costs recoverable through the RES tariff. See Note 3.These contracts expire in various years between 2030 and 2035.
In February 2016, a facility achieved commercial operation status. The related contract expires in 2036. Estimated future payments, not included in the table above, are $3 million in each of 2016 through 2020 and $43 million through the end of the contract.
TEP and UNS Electric havehas entered into REC purchase agreements to purchase the environmental attributes from retail customers with solar installations. Payments for the RECs are termed Performance-Based Incentives (PBIs) and are paid in contractually agreed-upon intervals (usually quarterly) based on metered renewable energy production. PBIs are recoverable through the RES tariff.
See Note 3.2for additional information regarding TEP's RES tariff.
Operating Leases
Our operating lease expense is primarily for rail cars, office facilities, land easements, and rights of wayrights-of-way with varying terms, provisions, and expiration dates. UNS Energy'sTEP's operating lease expense totaled $3 million in each of 2013, 2012,2015 and 2011,2014 and TEP's operating lease expense totaled $2 million in each2013.
CONTINGENCIES
Navajo Generating Station Lease Extension
Navajo Generating Station (Navajo) is located on a site that is leased from the Navajo Nation with an initial lease term through 2019. The Navajo Nation signed a lease amendment in 2013 that would extend the lease from 2019 through 2044. The participants in Navajo, including TEP, have not signed the lease amendment because certain participants have expressed an interest in discontinuing their participation in Navajo. Negotiations between the participants are ongoing, and all parties will likely agree to the terms. To become effective, this lease amendment must be signed by all of 2013, 2012,the participants, approved by the Department of the Interior, and 2011.is subject to environmental reviews. Once the lease amendment becomes effective, the participants will be responsible for additional lease costs from the date the Navajo Nation signed the lease amendment. TEP owns 7.5% of Navajo. In 2015, TEP recorded additional estimated lease expense of approximately $1 million with the expectation that the lease amendment will become effective. TEP's Consolidated Balance Sheets reflect a total liability related

70


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



to the lease amendment of $3 million and $2 million at December 31, 2015 and 2014, respectively, recorded in Regulatory and Other Liabilities—Other.
Claims Related to Springerville Generating Station Unit 1
In November 2014, the Springerville Unit 1 Third-Party Owners filed a complaint (FERC Action) against TEP at the FERC alleging that TEP had not agreed to wheel power and energy for the Third-Party Owners in the manner specified in the existing Springerville Unit 1 facility support agreement between TEP and the Third-Party Owners and for the cost specified by the Third-Party Owners. The Third-Party Owners requested an order from the FERC requiring such wheeling of the Third-Party Owners’ energy from their Springerville Unit 1 interests beginning in January 2015 to the Palo Verde switchyard and for the price specified by the Third-Party Owners. In February 2015, the FERC issued an order denying the Third-Party Owners complaint. In March 2015, the Third-Party Owners filed a request for rehearing in the FERC Action, which the FERC denied in October 2015. In December 2015, the Third-Party Owners appealed the FERC’s order denying the Third-Party Owners' complaint to the U.S. Court of Appeals for the Ninth Circuit. In December 2015, TEP filed an unopposed motion to intervene in the Ninth Circuit appeal.
On December 19, 2014, the Third-Party Owners filed a complaint against TEP in the Supreme Court of the State of New York, New York County (New York Action). In response to motions filed by TEP to dismiss various counts and compel arbitration of certain of the matters alleged, and the court’s subsequent ruling on the motions, the Third-Party Owners have amended the complaint three times, dropping certain of the allegations and raising others in the New York Action and in the arbitration proceeding described below. As amended, the New York Action alleges, among other things, that TEP failed to properly operate, maintain, and make capital investments in Springerville Unit 1 during the term of the leases and that TEP has breached the lease transaction documents by refusing to pay certain of the Third-Party Owners’ claimed expenses. The third amended complaint seeks $71 million in liquidated damages and direct and consequential damages in an amount to be determined at trial. The Third-Party Owners have also agreed to stay their claim that TEP has not agreed to wheel power and energy as required pending the outcome of the FERC Action. In November 2015, the Third-Party Owners filed a motion for summary judgment on their claim that TEP has failed to pay certain of the Third-Party Owners’ claimed expenses.
In December 2014 and January 2015, Wilmington Trust Company, as Owner Trustees and Lessors under the leases of the Third-Party Owners, sent notices to TEP that alleged that TEP had defaulted under the Third-Party Owners’ leases. The notices demanded that TEP pay liquidated damages totaling approximately $71 million. In letters to the Owner Trustees, TEP denied the allegations in the notices.
In April 2015, TEP filed a demand for arbitration with the American Arbitration Association (AAA) seeking an award of the Owner Trustees and Co-Trustees' share of unreimbursed expenses and capital expenditures for Springerville Unit 1. In June 2015, the Third-Party Owners filed a separate demand for arbitration with the AAA alleging, among other things, that TEP has failed to properly operate, maintain and make capital investments in Springerville Unit 1 since the leases have expired. The Third-Party Owners’ arbitration demand seeks declaratory judgments, damages in an amount to be determined by the arbitration panel and the Third-Party Owners’ fees and expenses. TEP and the Third-Party Owners have since agreed to consolidate their arbitration demands into one proceeding. In August 2015, the Third-Party Owners filed an amended arbitration demand adding claims that TEP has converted the Third-Party Owners’ water rights and certain emission reduction payments and that TEP is improperly dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. In October 2015, the arbitration panel granted TEP’s motion for interim relief, ordering the Owner Trustees and Co-Trustees to pay TEP their pro-rata share of unreimbursed expenses and capital expenditures for Springerville Unit 1 during the pendency of the arbitration. The arbitration panel also denied the Third-Party Owners’ motion for interim relief which had requested that TEP be enjoined from dispatching the Third-Party Owners’ unscheduled Springerville Unit 1 power and capacity. TEP has been scheduling, when economical, the Third-Party Owners’ entitlement share of power from Springerville Unit 1, as permitted under the Springerville Unit 1 facility support agreement, since June 14, 2015. The arbitration hearing is scheduled for July 2016.
In November 2015, TEP filed a petition to confirm the interim arbitration order in the Supreme Court of the State of New York naming the Owner Trustee and Co-Trustee as respondents. The petition seeks an order from the court confirming the interim arbitration order under the Federal Arbitration Act. In December 2015, the Owner Trustees filed an answer to the petition and a cross-motion to vacate the interim arbitration order.
As of December 31, 2015, TEP has billed the Third-Party Owners approximately $23 million for their pro-rata share of Springerville Unit 1 expenses and $4 million for their pro-rata share of capital expenditures, none of which had been paid as of February 17, 2016.
TEP CONTINGENCIEScannot predict the outcome of the claims relating to Springerville Unit 1, and, due to the general and non-specific scope and nature of the claims, TEP cannot determine estimates of the range of loss, if any, at this time. TEP intends to vigorously

71


Potential Purchase of Gas-Fired Generation FacilityNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    
In 2013,


defend itself against the claims asserted by the Third-Party Owners and to vigorously pursue the claims it has asserted against the Third-Party Owners.
TEP and UNS Electric entered into an agreementthe Third-Party Owners have agreed to purchasestay these litigation matters relating to Springerville Unit 1 in furtherance of settlement negotiations. However, there is no assurance that a gas-fired generation facility; see Note 8.settlement will be reached or that the litigation will not continue.
ClaimClaims Related to San Juan Generating Station
San Juan Coal Company (SJCC) operates an underground coal mine in an area where certain gas producers have oil and gas leases with the federal government, the State of New Mexico, and private parties. These gas producers allege that SJCC’s underground coal mine interferes with their operations, reducing the amount of natural gas they can recover. SJCC compensated certain gas producers for any remaining production from wells deemed close enough to the mine to warrant plugging and abandoning them. These settlements, however, do not resolve all potential claims by gas producers in the area. TEP owns 50% of Units 1 and 2 at San Juan Generating Station (San Juan), which represents approximately 20% of the total generation capacity at San Juan, and is responsible for its share of any settlements. TEP cannot estimate the impact of any future claims by these gas producers on the cost of coal at San Juan.
In August 2013, the Bureau of Land Management (BLM) proposed regulations that, among other things, redefine the term “underground mine” to exclude high-wall mining operations and impose a higher surface mine coal royalty on high-wall mining. SJCC utilized high-wall mining techniques at its surface mines prior to beginning underground mining operations in January 2003. If the proposed regulations become effective, SJCC may be subject to additional royalties on coal delivered to San Juan between August 2000 and January 2003 totaling approximately $5$5 million of which TEP’s proportionate share would approximate $$1 million. TEP owns 50% of Units 1 million.and 2 at San Juan, which represents approximately 20% of the total generation capacity at San Juan, and is responsible for its share of any settlements. TEP cannot predict the final outcome of the BLM’s proposed regulations.
In February 2013, WildEarth Guardians (WEG) filed a Petition for Review in the U.S. District Court of Colorado against the Office of Surface Mining (OSM) challenging federal administrative decisions affecting seven different mines in four states issued at various times from 2007 through 2012. In its petition, WEG challenges several unrelated mining plan modification approvals, which were each separately approved by OSM. Of the fifteen claims for relief in the WEG Petition, two concern SJCC’s San Juan mine. WEG’s allegations concerning the San Juan mine arise from OSM administrative actions in 2008. WEG alleges various National Environmental Policy Act (NEPA) violations against OSM, including, but not limited to, OSM’s alleged failure to provide requisite public notice and participation, alleged failure to analyze certain environmental impacts, and alleged reliance on outdated and insufficient documents. WEG’s petition seeks various forms of relief, including a finding that the federal defendants violated NEPA by approving the mine plans, voiding, reversing, and remanding the various mining modification approvals, enjoining the federal defendants from re-issuing the mining plan approvals for the mines until compliance with NEPA has been demonstrated, and enjoining operations at the seven mines. SJCC intervened in this matter. SJCC was granted its motion to sever its claims from the lawsuit and transfer venue to the U.S. District Court for the District of New Mexico, where this matter is now proceeding. The parties have requested the court to stay this matter until April 2016, in furtherance of settlement negotiations. If WEG ultimately obtains the relief it has requested, such a ruling could require significant expenditures to reconfigure operations at the San Juan mine, impact the production of coal, and impact the economic viability of the San Juan mine and San Juan. TEP cannot currently predict the outcome of this matter or the range of its potential impact.
Claims Related to Four Corners Generating Station
In October 2011, EarthJustice, on behalf of several environmental organizations, filed a lawsuit in the United StatesU.S. District Court for the District of New Mexico against Arizona Public Service Company (APS) and the other Four Corners Generating Station (Four Corners) participants alleging violations of the Prevention of Significant Deterioration (PSD) provisions of the Clean Air Act at Four Corners. In January 2012, EarthJustice amended their complaint alleging violations of New Source Performance Standards resulting from equipment replacements at Four Corners. Among other things, the plaintiffs seeksought to have the court issue an order to cease operations at Four Corners until any required PSD permits are issued and order the payment of civil penalties, including a beneficial mitigation project. In April 2012, APS filed motions to dismiss with the court for all claims asserted by EarthJustice in the amended complaint. The joint participants have applied to have the matter stayed until March 17, 2014 in furtherance of settlement talks.

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TEP owns 7% of Four Corners Units 4 and 5 and is liable for its share of any resulting liabilities. TEP cannot predictIn June 2015, APS, the final outcomeoperator of Four Corners, announced a settlement with the Environmental Protection Agency (EPA) for outstanding environmental issues related to New Source Review provisions under the Clean Air Act. The settlement calls for environmental upgrades including Selective Catalytic Reduction (SCR) upgrades already planned for under the Regional Haze regulation, environmental mitigation projects, and civil penalties. A consent decree reflecting terms of the claims relating to Four Corners, and, due tosettlement was entered by the general and non-specific naturecourt in August 2015, effectively closing the case. TEP's share of the claims andadditional capital, excluding the indeterminate scope and natureSCR upgrades, is approximately $2 million over the three year period it will take to construct the upgrades. TEP’s share of the injunctive relief sought for this claim,annual O&M expenses is approximately $1 million. In addition, TEP cannot determine estimates of the range of loss at this time. TEP accrued estimated losses ofrecorded less than $1$1 million in 2011 for this claim based on its share of a settlement offer to resolve the claim.one-time charges for environmental mitigation projects and civil penalties.
In May 2013, the New Mexico Taxation and Revenue Department (NMTRD) issued a notice of assessment for coal severance tax, penalties, and interest totaling $30 million to the coal supplier at Four Corners. TheTEP's share of the assessment is $1 million based on our ownership percentage. In December 2013, the coal supplier and Four Corners’ operating agent intend to contestfiled a claim contesting the validity of the assessment on behalf of the participants in Four Corners, who will be liable for their share of any

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resulting liabilities. TEP’s shareIn June 2015, the U.S. District Court ruled in favor of the assessment based on its ownershipFour Corners' participants. NMTRD filed an appeal of Four Corners is approximately $1 million.the decision in August 2015. TEP cannot predict the final outcome or timing of resolution of this claim.these claims.
Mine Closure Reclamation at Generating Stations Not Operated by TEP
TEP pays ongoing reclamation costs related to coal mines that supply generating stations in which TEP has an ownership interest but does not operate. TEP is liable for a portion of final reclamation costs upon closure of the mines servicing Navajo, San Juan, and Four Corners. TEP’s share of reclamation costs at all three mines is expected to be $44$43 million upon expiration of the coal supply agreements, which expire between 20172019 and 2031. The reclamation liability (present value of future liability) recorded was $18$25 million and $22 million at December 31, 20132015 and $16 million at December 31, 2012.2014, respectively.
Amounts recorded for final reclamation are subject to various assumptions, such as estimations of reclamation costs, the dates when final reclamation will occur, and the credit-adjusted risk-free interest rate to be used to discount future liabilities.expected inflation rate. As these assumptions change, TEP will prospectively adjust the expense amounts for final reclamation over the remaining coal supply agreements’ terms. TEP does not believe that recognition of its final reclamation obligations will be material to TEP in any single year because recognition will occur over the remaining terms of its coal supply agreements.
TEP’s PPFAC allows us to pass through most fuel costs, including final reclamation costs, as a component of fuel cost, to retail customers. Therefore, TEP classifies these costs as a regulatory asset by increasing the regulatory asset and the reclamation liability over the remaining life of the coal supply agreements and recovers the regulatory asset through the PPFAC as final mine reclamation costs are paid to the coal suppliers.
Discontinued Transmission Project
TEP and UNS Electric had initiated a project to jointly construct a 60-mile60-mile transmission line from Tucson, Arizona to Nogales, Arizona in response to an order by the ACC to UNS Electric to improve the reliability of electric service in Nogales. At this time, TEP and UNS Electric will not proceed with the project based on the cost of the proposed 345-kV345-kilo-volt (kV) line, the difficulty in reaching agreement with the United States Forest Service on a path for the line, and concurrence by the ACC ofthat recent transmission plans filedadditions by TEP and UNS Electric supportingsupport elimination of this project. TEP and UNS Electric plan to maintain the Certificate of Environmental Compatibility (CEC) previously granted by the ACC for this project in contemplation of using the route to serve future customers and to address reliability needs. As part of the 2013 TEP Rate Order, TEP agreed to seek recovery of the project costs from the FERC before seeking rate recovery from the ACC. See Note 3. In 2012, TEP wrote off $5 million of the capitalized costs believed not probable of recovery and recorded a regulatory asset of $5$5 million for the balance deemed probable of recovery.recovery in TEP's next FERC rate case.
Performance Guarantees
TEP has joint participation agreements with participants at Navajo, San Juan, Four Corners, and the Luna Energy Facility (Luna). The participants in each of the remote generating stations, in which TEP participates, including TEP, have guaranteed certain performance obligations of the other participants.obligations. Specifically, in the event of payment default, of a participant, the non-defaulting participants have agreed to bear a proportionate share of expenses otherwise payable by the defaulting participant. In exchange, the non-defaulting participants are entitled to receive their proportionate share of the generating capacity of the defaulting participants. TEP's jointparticipant. As of December 31, 2015, there have been no such payment defaults under any of the participation agreements expireagreements. The Navajo participation agreement expires in 2016 through2019, San Juan in 2022, Four Corners in 2041, and Luna in 2046.
UNS ELECTRIC CONTINGENCIES
NOTE 8. EMPLOYEE BENEFIT PLANS
Potential PurchasePENSION BENEFIT PLANS
TEP has three noncontributory, defined benefit pension plans. Benefits are based on years of Gas-Fired Generation Facilityservice and average compensation. Two of the plans are for substantially all employees. We fund those plans by contributing at least the minimum amount required under the Internal Revenue Service (IRS) regulations. We also maintain a Supplemental Executive Retirement Plan (SERP) for executive management.
In 2013, OTHER RETIREE BENEFIT PLANS
TEP provides limited health care and UNS Electric entered intolife insurance benefits for retirees. Active TEP employees may become eligible for these benefits if they reach retirement age while working for TEP or an agreement to purchase a gas-fired generation facility. See Note 8.affiliate.

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ENVIRONMENTAL MATTERS
Environmental Regulation
The Environmental Protection Agency (EPA) limits the amount of sulfur dioxide (SO2), nitrogen oxide (NOx), particulate matter, mercury andTEP funds its other emissions released into the atmosphere by power plants.retiree benefits for classified employees through a Voluntary Employee Beneficiary Association (VEBA). TEP capitalized $5contributed $4 million in 2013, $2 million in 2012,2015 and $8 million in 2011 in construction costs to comply with environmental requirements. TEP expects to capitalize environmental compliance costs of $12$3 million in 2014 and $36 million in 2015. In addition, TEP recorded O&M expenses of $8 million in 2013 $15 million in 2012, and $12 million in 2011. TEP expects environmental O&M expenses to be $5 million in each of 2014 and 2015.the VEBA. Other retiree benefits for unclassified employees are self-funded.
TEP may incur added costs to comply with futureREGULATORY RECOVERY
We record changes in federal and state environmental laws, regulations, and permit requirements at its power plants. Complying with these changes may reduce operating efficiency. TEP expects to recover the cost of environmental compliance from its ratepayers.
Hazardous Air Pollutant Requirements
In February 2012, the EPA issued final rules for the control of mercury emissionsour non-SERP pension plans and other hazardous air pollutants from power plants. Basedretiree benefit plan, not yet reflected in net periodic benefit cost, as a regulatory asset, as such amounts are probable of future recovery in the rates charged to retail customers. Changes in the SERP obligation, not yet reflected in net periodic benefit cost, are recorded in Other Comprehensive Income since SERP expense is not currently recoverable in rates.
The following table summarizes pension and other retiree benefit related amounts (excluding tax balances) included on the EPA's final Mercury and Air Toxics (MATs) rule, additional emission control equipment will be required by 2015. The estimated costs include:
Estimated Emissions Control Costs:Navajo Four Corners Springerville
 Millions of Dollars
Capital Expenditures - Mercury Emissions Control$1
 $1
 $5
Annual O&M Expenses1
 1
 3
TEP expects Sundt and San Juan's current emission controls to be adequate to comply with the EPA's final standards.
Regional Haze Rules
The EPA's Regional Haze Rules require emission controls known as BART for certain industrial facilities emitting air pollutants that reduce visibility in national parks and wilderness areas. The rules call for all states to establish goals and emission reduction strategies for improving visibility. States must submit these goals and strategies to the EPA for approval. Because Navajo and Four Corners are located on the Navajo Indian Reservation, they are not subject to state oversight; the EPA oversees regional haze planning for these power plants.
In the western U.S., Regional Haze BART determinations have focused on controls for NOx, often resulting in a requirement to install SCRs. Complying with the EPA’s BART rules, and with other future environmental rules, may make it economically impractical to continue operating the Navajo, San Juan, and Four Corners power plants or for individual owners to continue to participate in these power plants. TEP cannot predict the ultimate outcome of these matters.
TEP's estimated potential costs involved in meeting these rules are:Consolidated Balance Sheets:
Estimated Potential Emissions Control Costs:
Navajo (1)
 
San Juan (2)
 
Four Corners (3)
 
Sundt (4)
 Millions of Dollars  
Capital - SCR$42
 $ 180-200
 $35
 $
Capital - SNCR
 35
 
 12
Annual O&M - SCR1
 6
 2
 
Annual O&M - SNCR
 1
 
 5-6
 Pension Benefits Other Retiree Benefits
 December 31,
(in millions)2015 2014 2015 2014
Regulatory Pension Asset Included in Regulatory Assets$115
 $117
 $5
 $9
Accrued Benefit Liability Included in Accrued Employee Expenses(1) (1) (2) (2)
Accrued Benefit Liability Included in Pension and Other Retiree Benefits(57) (71) (63) (67)
Accumulated Other Comprehensive Loss (related to SERP)5
 5
 
 
Net Amount Recognized$62
 $50
 $(60) $(60)
OBLIGATIONS AND FUNDED STATUS
We measured the actuarial present values of all pension benefit obligations and other retiree benefit plans at December 31, 2015 and 2014. The table below includes all of TEP’s plans. All plans have projected benefit obligations in excess of the fair value of plan assets for each period presented. The status of our pension benefit and other retiree benefit plans are summarized below:
 Pension Benefits Other Retiree Benefits
 Year Ended December 31,
(in millions)2015 2014 2015 2014
Change in Projected Benefit Obligation       
Benefit Obligation at Beginning of Year$407
 $330
 $81
 $74
Actuarial (Gain) Loss(22) 67
 (5) 5
Interest Cost17
 16
 3
 3
Service Cost12
 10
 4
 4
Benefits Paid(20) (16) (5) (5)
Projected Benefit Obligation at End of Year394
 407
 78
 81
Change in Plan Assets       
Fair Value of Plan Assets at Beginning of Year335
 307
 12
 10
Actual Return on Plan Assets(3) 35
 
 1
Benefits Paid(20) (16) (5) (5)
Employer Contributions (1)
24
 9
 6
 6
Fair Value of Plan Assets at End of Year336
 335
 13
 12
Funded Status at End of Year$(58) $(72) $(65) $(69)
(1)
The EPA is considering a better-than-BART plan wherein: one unit at Navajo will be shut down by 2020; SCR installation (or the equivalent) will be installed on the remaining two units by 2030; and conventional coal-fired generation will cease by December 2044.In 2016, TEP expects to contribute $10 million to the EPA to reach a decision in 2014. In addition, the installation of SCR technology could increase particulates which may require that baghouses be installed. The additional capital cost of baghouses approximates $43 million with O&M on the baghouses expected to be less than $1 million per year.
pension plans.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



The following table provides the components of TEP’s regulatory assets and accumulated other comprehensive loss that have not been recognized as components of net periodic benefit cost as of the dates presented:
 Pension Benefits Other Retiree Benefits
 Year Ended December 31,
(in millions)2015 2014 2015 2014
Net Loss$117
 $118
 $6
 $11
Prior Service Cost (Benefit)3
 4
 (1) (2)
The accumulated benefit obligation aggregated for all pension plans is $355 million and $365 million at December 31, 2015 and 2014, respectively.
All three of our pension plans had accumulated benefit obligations in excess of plan assets at December 31, 2014. As a result of increases in discount rates and employer contributions, two of our plans had accumulated benefit obligations in excess of plan assets at December 31, 2015. The following table includes information for pension plans with accumulated benefit obligations in excess of pension plan assets:
 December 31,
(in millions)2015 2014
Accumulated Benefit Obligation$188
 $365
Fair Value of Plan Assets169
 335
Net periodic benefit plan cost includes the following components:
 Pension Benefits Other Retiree Benefits
 Year Ended December 31,
(in millions)2015 2014 2013 2015 2014 2013
Service Cost$12
 $10
 $11
 $4
 $4
 $3
Interest Cost17
 16
 14
 3
 3
 3
Expected Return on Plan Assets(23) (21) (19) (1) (1) (1)
Actuarial Loss Amortization7
 3
 8
 
 
 
Net Periodic Benefit Cost$13
 $8
 $14
 $6
 $6
 $5
Approximately 20% of the net periodic benefit cost was capitalized as a cost of construction and the remainder was included in income.
We measured service and interest costs for pension and other postretirement benefits utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. At the end of 2015, we changed our approach to determine the service and interest cost components of pension and other postretirement benefit expense. We elected to measure service and interest costs by applying the specific spot rates along that yield curve to the plans' liability cash flows beginning in 2016. TEP believes the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans' liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations nor the funded status. We accounted for this change as a change in accounting estimate, and accordingly, have accounted for it on a prospective basis.
The changes in plan assets and benefit obligations recognized as regulatory assets or in AOCI are as follows:
 Pension Benefits
 Regulatory Asset AOCI
(in millions)2015 2014 2013 2015 2014 2013
Current Year Actuarial (Gain) Loss$5
 $49
 $(42) $
 $3
 $(1)
Amortization of Actuarial Gain (Loss)(7) (3) (8) 
 
 
Total Recognized (Gain) Loss$(2) $46
 $(50) $
 $3
 $(1)

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



 Other Retiree Benefits
 Regulatory Asset
(in millions)2015 2014 2013
Current Year Actuarial (Gain) Loss$(4) $5
 $(6)
For all pension plans, we amortize prior service costs on a straight-line basis over the average remaining service period of employees expected to receive benefits under the plan. We expect to amortize an estimated $7 million net loss from pension regulatory assets and an estimated $1 million in prior service credit from other retiree benefit plan regulatory assets into net periodic benefit cost in 2016.
The following table includes the weighted average assumptions used to determine benefit obligations:
 Pension Benefits Other Retiree Benefits
 2015 2014 2015 2014
Discount Rate4.5-4.6% 4.1-4.2% 4.2% 3.9%
Rate of Compensation Increase3.0% 3.0% N/A N/A
The following table includes the weighted average assumptions used to determine net periodic benefit costs:
 Pension Benefits Other Retiree Benefits
 2015 2014 2013 2015 2014 2013
Discount Rate4.1%-4.2% 5.0%-5.1% 4.1%-4.1% 3.9% 4.7% 3.8%
Rate of Compensation Increase3.0% 3.0% 3.0% N/A N/A N/A
Expected Return on Plan Assets7.0% 7.0% 7.0% 7.0% 7.0% 7.0%
Net periodic benefit cost is subject to various assumptions and determinations, such as the discount rate, the rate of compensation increase, and the expected return on plan assets.
We use a combination of sources in selecting the expected long-term rate-of-return-on-assets assumption, including an investment return model. The model used provides a “best-estimate” range over 20 years from the 25th percentile to the 75th percentile. The model, used as a guideline for selecting the overall rate-of-return-on-assets assumption, is based on forward looking return expectations only. The above method is used for all asset classes.
Changes that may arise over time with regard to these assumptions and determinations will change amounts recorded in the future as net periodic benefit cost. The following table includes the assumed health care cost trend rates:
 December 31,
 2015 2014
Next Year7.6% 6.7%
Ultimate Rate Assumed4.5% 4.5%
Year Ultimate Rate is Reached2036 2027
Assumed health care cost trend rates significantly affect the amounts reported for health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects on the December 31, 2015 amounts:
(in millions)
One-Percentage-
Point Increase
 
One-Percentage-
Point Decrease
Effect on Total Service and Interest Cost Components$1
 $1
Effect on Retiree Benefit Obligation6
 5

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



PENSION PLAN AND OTHER RETIREE BENEFIT ASSETS
Pension Assets
We calculate the fair value of plan assets on December 31, the measurement date. Pension plan asset allocations, by asset category, on the measurement date were as follows:
 2015 2014
Asset Category 
Equity Securities49% 48%
Fixed Income Securities41% 43%
Real Estate8% 7%
Other2% 2%
Total100% 100%
The following table sets forth the fair value measurements of pension plan assets by level within the fair value hierarchy:
 
Quoted Prices in
Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 Total
(in millions)December 31, 2015
Asset Category       
Cash Equivalents$1
 $
 $
 $1
Equity Securities:       
United States Large Cap
 81
 
 81
United States Small Cap
 17
 
 17
Non-United States
 67
 
 67
Fixed Income
 137
 
 137
Real Estate
 8
 18
 26
Private Equity
 
 7
 7
Total$1
 $310
 $25
 $336
        
(in millions)December 31, 2014
Asset Category       
Cash Equivalents$1
 $
 $
 $1
Equity Securities:      

United States Large Cap
 82
 
 82
United States Small Cap
 17
 
 17
Non-United States
 61
 
 61
Fixed Income
 143
 
 143
Real Estate
 8
 16
 24
Private Equity
 
 7
 7
Total$1
 $311
 $23
 $335
Level 1 cash equivalents are based on observable market prices and are comprised of the fair value of commercial paper, money market funds, and certificates of deposit.
Level 2 investments comprise amounts held in commingled equity funds, United States bond funds, and real estate funds. Valuations are based on active market quoted prices for assets held by each respective fund.
Level 3 real estate investments were valued using a real estate index value. The real estate index value was developed based on appraisals comprising 100% of real estate assets tracked by the index.
Level 3 private equity funds are classified as funds-of-funds. They are valued based on individual fund manager valuation models.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



The following table sets forth a reconciliation of changes in the fair value of pension assets classified as Level 3 in the fair value hierarchy. There were no transfers in or out of Level 3.
(in millions)Private Equity Real Estate Total
Beginning Balance at January 1, 2014$7
 $14
 $21
Actual Return on Plan Assets:    

Assets Held at Reporting Date1
 2
 3
Purchases, Sales, and Settlements(1) 
 (1)
Ending Balance at December 31, 20147
 16
 23
Actual Return on Plan Assets:     
Assets Held at Reporting Date1
 2
 3
Purchases, Sales, and Settlements(1) 
 (1)
Ending Balance at December 31, 2015$7
 $18
 $25
Pension Plan Investments
Investment Goals
Asset allocation is the principal method for achieving each pension plan’s investment objectives while maintaining appropriate levels of risk. We consider the projected impact on benefit security of any proposed changes to the current asset allocation policy. The expected long-term returns and implications for pension plan sponsor funding are reviewed in selecting policies to ensure that current asset pools are projected to be adequate to meet the expected liabilities of the pension plans. We expect to use asset allocation policies weighted most heavily to equity and fixed income funds, while maintaining some exposure to real estate and opportunistic funds. Within the fixed income allocation, long-duration funds may be used to partially hedge interest rate risk.
Risk Management
We recognize the difficulty of achieving investment objectives in light of the uncertainties and complexities of the investment markets. We also recognize some risk must be assumed to achieve a pension plan’s long-term investment objectives. In establishing risk tolerances, the following factors affecting risk tolerance and risk objectives will be considered: plan status, plan sponsor financial status and profitability, plan features, and workforce characteristics. We have determined that the pension plans can tolerate some interim fluctuations in market value and rates of return in order to achieve long-term objectives. TEP tracks each pension plan’s portfolio relative to the benchmark through quarterly investment reviews. The reviews consist of a performance and risk assessment of all investment categories and on the portfolio as a whole. Investment managers for the pension plan may use derivative financial instruments for risk management purposes or as part of their investment strategy. Currency hedges may also be used for defensive purposes.
Relationship between Plan Assets and Benefit Obligations
The overall health of each plan will be monitored by comparing the value of plan obligations (both Accumulated Benefit Obligation and Projected Benefit Obligation) against the fair value of assets and tracking the changes in each. The frequency of this monitoring will depend on the availability of plan data, but will be no less frequent than annually via actuarial valuation.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Target Allocation Percentages
The current target allocation percentages for the major asset categories of the plan as of December 31, 2015 follow. Each plan allows a variance of +/- 2% from these targets before funds are automatically rebalanced.
 TEP Plans VEBA Trust
Cash/Treasury Bills—% 2%
Equity Securities:   
United States Large Cap24% 39%
United States Small Cap5% 5%
Non-United States Developed15% 7%
Non-United States Emerging5% 9%
Fixed Income42% 38%
Real Estate8% —%
Private Equity1% —%
Total100% 100%
Pension Fund Descriptions
For each type of asset category selected by the Pension Committee, our investment consultant assembles a group of third-party fund managers and allocates a portion of the total investment to each fund manager. In the case of the private equity fund, our investment consultant directs investments to a private equity manager that invests in third-parties’ funds.
Other Retiree Benefit Assets
As of December 31, 2015, the fair value of VEBA trust assets was $13 million, of which $5 million were fixed income investments and $8 million were equities. As of December 31, 2014, the fair value of VEBA trust assets was $12 million, of which $4 million were fixed income investments and $8 million were equities. The VEBA trust assets are primarily Level 2. There are no Level 3 assets in the VEBA trust.
ESTIMATED FUTURE BENEFIT PAYMENTS
TEP expects the following benefit payments to be made by the defined benefit pension plans and other retiree benefit plan, which reflect future service, as appropriate.
(in millions)2016 2017 2018 2019 2020 2021-2025
Pension Benefits$17
 $18
 $19
 $21
 $22
 $125
Other Retiree Benefits5
 5
 5
 6
 6
 33
DEFINED CONTRIBUTION PLAN
We offer a defined contribution savings plan to all eligible employees. The Internal Revenue Code identifies the plan as a qualified 401(k) plan. Participants direct the investment of contributions to certain funds in their account. We match part of a participant’s contributions to the plan. TEP made matching contributions to the plan of $5 million in 2015, 2014, and 2013.

NOTE 9. SHARE-BASED COMPENSATION
2011 STOCK AND INCENTIVE PLAN
The Fortis acquisition of UNS Energy in 2014 resulted in accelerated vesting and expense recognition of all outstanding non-vested UNS Energy share-based awards issued under the UNS Energy 2011 Omnibus Stock and Incentive Plan (2011 Plan). The outstanding non-vested awards would otherwise have been recognized over remaining vesting periods through February 2017. TEP recognized approximately $2 million of expense in 2014 due to the accelerated vesting of the awards. TEP recorded total share-based compensation expense of $5 million for the year ended December 31, 2014 and $3 million for the year ended December 31, 2013. In August 2014, UNS Energy settled all outstanding share-based compensation awards related to the 2011 Plan in cash.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



2015 SHARE UNIT PLAN
The Human Resources and Governance Committee (Committee) of UNS Energy, approved and UNS Energy's Board of Directors ratified the 2015 Share Unit Plan (Plan) effective as of January 1, 2015. Under the Plan, key employees, including executive officers of UNS Energy and its subsidiaries, may be granted long-term incentive awards of performance-based share units (PSUs) and time-based restricted share units (RSUs) annually. Each PSU and RSU granted will be valued based on one share of Fortis common stock converted to U.S. dollars. Fortis common stock is traded on the Toronto Stock Exchange. TEP’s share of the obligation and expense as a subsidiary of UNS Energy is allocated based on the Massachusetts Formula.
UNS Energy awarded 47,776 PSUs and 23,888 RSUs in 2015 that are payable on the third anniversary of the grant date. The awards are classified as liability awards based on the cash settlement feature. Liability awards are measured at their fair value at the end of each reporting period and will fluctuate based on the price of Fortis common stock as well as the level of achievement of the financial performance criteria. At December 31, 2015, TEP's allocated share of probable payout is $2 million.
TEP's allocated portion of the compensation expense is recognized in Operations and Maintenance on the Consolidated Statements of Income. Compensation expense associated with unvested PSUs and RSUs is recognized on a straight-line basis over the minimum required service period in an amount equal to the fair value on the measurement date or each reporting period. TEP recorded $1 million for the year ended December 31, 2015 based on its share of UNS Energy's compensation expense.

NOTE 10. SUPPLEMENTAL CASH FLOW INFORMATION
CASH TRANSACTIONS
 Year Ended December 31,
(in millions)2015 2014 2013
Interest, Net of Amounts Capitalized$65
 $83
 $53
Income Taxes
 
 
NON-CASH TRANSACTIONS
Other significant non-cash investing and financing activities that affected recognized assets and liabilities but did not result in cash receipts or payments were as follows:
 Year Ended December 31,
(in millions)2015 2014 2013
Accrued Capital Expenditures$28
 $29
 $24
Net Cost of Removal of Interim Retirements (1)
1
 12
 25
Commitment to Purchase Capital Lease Interests
 109
 55
Capital Lease Obligations (2)

 1
 9
Proceeds from Issuance of Long-Term Debt Deposited in Trust
 
 191
Asset Retirement Obligations (3)
3
 4
 8
(1)
The non-cash net cost of removal of interim retirements represents an accrual for future asset retirement obligations that does not impact earnings.
(2)
The Federal Implementation Plan (FIP) requires SCR; as partnon-cash change in capital lease obligations represents interest accrued for accounting purposes in excess of a proposal for an alternative, PNM, the State of New Mexico, and the EPA signed a non-binding agreement in which PNM agreed to close Units 2 & 3 by December 31, 2017 and install SNCRs on Units 1 & 4 by January 2016 or later. The State of New Mexico has submitted this plan to the EPA for approval. TEP expects the EPA will reach a decision in 2014. TEP owns 50% of San Juan Unit 2. At December 31, 2013, the net book value of TEP's share in San Juan Unit 2 was $113 million. If Unit 2 is retired early, we expect to request ACC approval to recover, over a reasonable time period, all costs associated with the early closure of the unit.
interest payments.
(3)
On December 30, 2013, APS, on behalfThe non-cash additions to asset retirement obligations and related capitalized assets represent a revision of estimated asset retirement cost due to changes in timing and amount of the co-owners of Four Corners, notified the EPA that they have chosen the alternative BART compliance strategy; APS closed Units 1, 2, and 3 in December 2013 and has agreed to the installation of SCR on Units 4 & 5 by July 31, 2018. TEP owns 7% of Four Corners Units 4 and 5.
expected future asset retirement obligations.
(4) In January 2014, the EPA issued a proposal that would require TEP to either (i) install SNCR by mid-2017 or (ii) eliminate the use of coal by the end of 2017 as a better-than-BART alternative. Under the proposal, TEP would be required to notify the EPA of its decision by July 31, 2015. The EPA is expected to issue a final BART determination by July 2014. At December 31, 2013, the net book value of the Sundt coal handling facilities was $27 million. If the coal handling facilities are retired early, we expect to request ACC approval to recover, over a reasonable time period, all the remaining costs of the coal handling facilities.
BART provisions of Regional Haze Rules requiring emission control upgrades do not apply to Springerville because the plant was built after the BART-applicable dates.

NOTE 8. POTENTIAL PURCHASE OF GAS-FIRED GENERATION FACILITY11. FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS
On December 23, 2013, TEPWe categorize our financial instruments into the three-level hierarchy based on inputs used to determine the fair value. Level 1 inputs are unadjusted quoted prices for identical assets or liabilities in an active market. Level 2 inputs include quoted prices for similar assets or liabilities, quoted prices in non-active markets, and UNS Electric entered into a purchase agreement with a subsidiary of Entegra to purchase Gila River Generating Station Unit 3 for $219 million, subject to certain closing adjustments. Gila River Unit 3, a gas-fired combined cycle unit with a nominal capacity rating of 550 MW, is located in Gila Bend, Arizona. TEP expects to purchase a 75% undivided interest in Gila River Unit 3 (413 MW) for approximately $164 million, and UNS Electric expects to purchase the remaining 25% undivided interest (137 MW) for approximately $55 million. TEP and UNS Electric expect the transaction to close in December 2014, subject to regulatory approvals and other closing conditions. In December 2013, UNS Electric filed an application for an accounting order with the ACC requesting authorization for UNS Electric to defer for future recovery specific non-fuel operating costs associated with Gila River Unit 3.
TEP expects to provide a letter of credit in March 2014 for $15 million to satisfy a condition of the purchase agreement. The seller of Gila River Unit 3 would be entitled to draw upon the letter of credit and apply such amount as liquidated damages if it has validly terminated the Purchase Agreement as a result of misrepresentations by TEP and UNS Electricpricing models whose inputs are observable, directly or the failure of TEP and UNS Electric to close the transaction when the closing conditions have been satisfied. Upon the close of the transaction, the letter of credit would be canceled.



K-11480


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



indirectly. Level 3 inputs are unobservable and supported by little or no market activity. Transfers between levels are recorded at the end of a reporting period. There were no transfers between levels in the periods presented.
FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS
The following tables present, by level within the fair value hierarchy, TEP’s assets and liabilities accounted for at fair value on a recurring basis. These assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
 Level 1 Level 2 Level 3 Total
(in millions)December 31, 2015
Assets 
Cash Equivalents(1)
$33
 $
 $
 $33
Restricted Cash(1)
4
 
 
 4
Energy Derivative Contracts - Regulatory Recovery(2)

 1
 
 1
Energy Derivative Contracts - No Regulatory Recovery(2)

 
 1
 1
Total Assets37
 1
 1
 39
Liabilities       
Energy Derivative Contracts - Regulatory Recovery(2)

 (10) (3) (13)
Interest Rate Swap(3)

 (3) 
 (3)
Total Liabilities
 (13) (3) (16)
Net Total Assets (Liabilities)$37
 $(12) $(2) $23
(in millions)December 31, 2014
Assets 
Cash Equivalents(1)
$15
 $
 $
 $15
Restricted Cash(1)
2
 
 
 2
Energy Derivative Contracts - Regulatory Recovery(2)
��
 
 2
 2
Total Assets17
 
 2
 19
Liabilities       
Energy Derivative Contracts - Regulatory Recovery(2)

 (9) (9) (18)
Energy Derivative Contracts - No Regulatory Recovery(2)

 
 (1) (1)
Energy Derivative Contracts - Cash Flow Hedge(2)

 
 (1) (1)
Interest Rate Swap(3)

 (5) 
 (5)
Total Liabilities
 (14) (11) (25)
Net Total Assets (Liabilities)$17
 $(14) $(9) $(6)
(1)
Cash Equivalents and Restricted Cash represent amounts held in money market funds and certificates of deposit valued at cost, including interest, which approximates fair market value. Cash Equivalents are included in Cash and Cash Equivalents on the Consolidated Balance Sheets. Restricted Cash is included in Investments and Other Property on the Consolidated Balance Sheets.
(2)
Energy Contracts include gas swap agreements (Level 2), power options (Level 2), gas options (Level 3), forward power purchase and sales contracts (Level 3) entered into to reduce exposure to energy price risk, and, at December 31, 2014 a power sale option (Level 3). These contracts are included in Derivative Instruments on the Consolidated Balance Sheets. The valuation techniques are described below.
(3)
The Interest Rate Swap is valued using an income valuation approach based on the 6-month LIBOR and is included in Derivative Instruments on the Consolidated Balance Sheets.

81


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



All energy derivative contracts are subject to legally enforceable master netting arrangements to mitigate credit risk. We present derivatives on a gross basis on the balance sheet. The tables below presents the potential offset of counterparty netting and cash collateral.
 Gross Amount Recognized on the Balance Sheets Gross Amount Not Offset on the Balance Sheets Net Amount
  Counterparty Netting of Energy Contracts Cash Collateral Received/Posted 
(in millions)December 31, 2015
Derivative Assets       
Energy Derivative Contracts$2
 $1
 $
 $1
Derivative Liabilities       
Energy Derivative Contracts(13) (1) 
 (12)
Interest Rate Swap(3) 
 
 (3)
(in millions)December 31, 2014
Derivative Assets       
Energy Derivative Contracts$2
 $2
 $
 $
Derivative Liabilities       
Energy Derivative Contracts(20) (2) 
 (18)
Interest Rate Swap(5) 
 
 (5)
DERIVATIVE INSTRUMENTS
We enter into various derivative and non-derivative contracts to reduce our exposure to energy price risk associated with our gas and purchased power requirements. The objectives for entering into such contracts include: creating price stability; meeting load and reserve requirements; and reducing exposure to price volatility that may result from delayed recovery under the PPFAC.
We primarily apply the market approach for recurring fair value measurements. When we have observable inputs for substantially the full term of the asset or liability or use quoted prices in an inactive market, we categorize the instrument in Level 2. We categorize derivatives in Level 3 when we use an aggregate pricing service or published prices that represent a consensus reporting of multiple brokers.
For both power and gas prices we obtain quotes from brokers, major market participants, exchanges, or industry publications and rely on our own price experience from active transactions in the market. We primarily use one set of quotations each for power and for gas and then validate those prices using other sources. We believe that the market information provided is reflective of market conditions as of the time and date indicated.
Published prices for energy derivative contracts may not be available due to the nature of contract delivery terms such as non-standard time blocks and non-standard delivery points. In these cases, we apply adjustments based on historical price curve relationships, transmission, and line losses.
We estimate the fair value of our gas options using a Black-Scholes-Merton option pricing model which includes inputs such as implied volatility, interest rates, and forward price curves.
The December 31, 2014 valuation of our power sale option was a function of observable market variables, regional power and gas prices, as well as the ratio between the two, which represents the prevailing market heat rate.
We also consider the impact of counterparty credit risk using current and historical default and recovery rates, as well as our own credit risk using credit default swap data.
The inputs and our assessments of the significance of a particular input to the fair value measurements require judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. We review the assumptions underlying our price curves monthly.
Cash Flow Hedges
We can enter into interest rate swaps to mitigate the exposure to volatility in variable interest rates on debt. We have an interest rate swap agreement that expires January 2020. We also had a power purchase swap to hedge the cash flow risk associated with

82


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



a long-term power supply agreement which expired in September 2015. The after-tax unrealized gains and losses on cash flow hedge activities are reported in the statement of comprehensive income. The loss expected to be reclassified to earnings within the next twelve months is estimated to be $1 million. The realized losses from our cash flow hedges are shown in the following table:
 Year Ended December 31,
(in millions)2015 2014 2013
Capital Lease Interest Expense$2
 $2
 $2
Long-Term Debt Interest Expense
 1
 1
Purchased Power1
 1
 1
As of December 31, 2015, the total notional amount of our interest rate swap was $29 million.
Energy Derivative Contracts - Regulatory Recovery
We record unrealized gains and losses on energy purchase contracts that are recoverable through the PPFAC on the balance sheet as a regulatory asset or a regulatory liability rather than reporting the transaction in the income statement or in the statement of other comprehensive income, as shown in following table:
 Year Ended December 31,
(in millions)2015 2014 2013
Unrealized Net Gain (Loss) Recorded to Regulatory (Assets) Liabilities$6
 $(18) $
Energy Derivative Contracts - No Regulatory Recovery
Forward contracts with long-term wholesale customers do not qualify for regulatory recovery. For these contracts that qualify as derivatives, we record unrealized gains and losses in the income statement, unless and until a normal purchase or normal sale election is made. In February 2015, TEP made a normal sale election for a three-year sales option contract entered into in December 2014. In June 2015, TEP entered into long-term power trading contracts that qualify as derivatives but do not qualify for regulatory recovery. The unrealized gains and losses on the long-term power trading contracts are recorded in the income statement, and 10% of any gains will be shared with ratepayers through the PPFAC, as realized.
Derivative Volumes
At December 31, 2015, we have energy contracts that will settle through the fourth quarter of 2018. The volumes associated with our energy contracts were as follows:
 December 31,
 2015 2014
Power Contracts GWh1,752
 2,604
Gas Contracts GBtu17,214
 19,932

83


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Level 3 Fair Value Measurements
The following table provides quantitative information regarding significant unobservable inputs in TEP’s Level 3 fair value measurements:
 Valuation Fair Value of   Range of
 Approach Assets Liabilities Unobservable Inputs Unobservable Input
(in millions)December 31, 2015
Forward Power ContractsMarket approach $1
 $(2) Market price per MWh $19.20
 $31.35
            
Gas Option ContractsOption model 
 (1) Market price per MMbtu $2.17
 $2.69

      Gas volatility 31.0% 58.3%
Level 3 Energy Contracts  $1
 $(3)      
            
(in millions)December 31, 2014
Forward Power ContractsMarket approach $1
 $(6) Market price per MWh $22.35
 $39.05
            
Power Sale OptionMarket approach 1
 (1) Market price per MWh $27.75
 $44.94
       Market price per MMbtu $2.88
 $4.02
            
Gas Option ContractsOption model 
 (4) Market price per MMbtu $2.72
 $3.26
       Gas volatility 30.8% 53.3%
Level 3 Energy Contracts  $2
 $(11)      
Changes in one or more of the unobservable inputs could have a significant impact on the fair value measurement depending on the magnitude of the change and the direction of the change for each input. The impact of changes to fair value, including changes from unobservable inputs, are subject to recovery or refund through the PPFAC mechanism and are reported on the balance sheet as a regulatory asset or regulatory liability, or as a component of other comprehensive income, rather than in the income statement.
The following table presents a reconciliation of changes in the fair value of assets and liabilities classified as Level 3 in the fair value hierarchy:
 Year Ended December 31,
(in millions)2015 2014
Beginning of Period$(9) $(2)
Gains (Losses) Recorded to:(1)
   
Net Regulatory Assets/Liabilities – Derivative Instruments(4) (8)
Electric Wholesale Sales3
 
Settlements8
 1
End of Period$(2) $(9)
(1)
Includes gains (losses) attributable to the change in unrealized gains/(losses) relating to assets (liabilities) still held at the end of the period of $(1) million and $(8) million for the years ended December 31, 2015, and 2014, respectively.
CREDIT RISK
The use of contractual arrangements to manage the risks associated with changes in energy commodity prices creates credit risk exposure resulting from the possibility of non-performance by counterparties pursuant to the terms of their contractual obligations. We enter into contracts for the physical delivery of energy and gas which contain remedies in the event of non-performance by the supply counterparties. In addition, volatile energy prices can create significant credit exposure from energy market receivables and subsequent measurement at fair value.
We have contractual agreements for energy procurement and hedging activities that contain certain provisions requiring each company to post collateral under certain circumstances. These circumstances include: exposures in excess of unsecured credit

84


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



limits; credit rating downgrades; or a failure to meet certain financial ratios. In the event that such credit events were to occur, we would have to provide certain credit enhancements in the form of cash or LOCs to fully collateralize our exposure to these counterparties.
We consider the effect of counterparty credit risk in determining the fair value of derivative instruments that are in a net asset position after incorporating collateral posted by counterparties and allocate the credit risk adjustment to individual contracts. We also consider the impact of our own credit risk after considering collateral posted on instruments that are in a net liability position and allocate the credit risk adjustment to all individual contracts.
Material adverse changes could trigger credit risk-related contingent features. At December 31, 2015, the value of all derivative instruments in net liability positions under contracts with credit risk-related contingent features, including contracts under the normal purchase normal sale exception, was $20 million, compared with $27 million at December 31, 2014. At December 31, 2015, TEP had less than $1 million of LOCs as credit enhancements with its counterparties. If the credit risk-related contingent features were triggered on December 31, 2015, TEP would have been required to post an additional $20 million of collateral of which $8 million relates to outstanding net payable balances for settled positions.
FINANCIAL INSTRUMENTS NOT CARRIED AT FAIR VALUE
The fair value of a financial instrument is the market price to sell an asset or transfer a liability at the measurement date. We use the following methods and assumptions for estimating the fair value of our financial instruments:
Borrowings under revolving credit facilities approximate the fair values due to the short-term nature of these financial instruments. These items have been excluded from the table below.
For long-term debt, we use quoted market prices, when available, or calculate the present value of remaining cash flows at the balance sheet date. When calculating present value, we use current market rates for bonds with similar characteristics such as credit rating and time-to-maturity. We consider the principal amounts of variable rate debt outstanding to be reasonable estimates of the fair value. We also incorporate the impact of our own credit risk using a credit default swap rate.
The use of different estimation methods and/or market assumptions may yield different estimated fair value amounts. The following table includes the face value and estimated fair value of our long-term debt:
 
Fair Value
Hierarchy
 Face Value Fair Value
   December 31,
(in millions)  2015 2014 2015 2014
Liabilities         
Long-Term Debt, including Current MaturitiesLevel 2 $1,466
 $1,375
 $1,529
 $1,457

NOTE 9.12. INCOME TAXES
Income tax expense differs from the amount of income tax determined by applying the United States statutory federal income tax rate of 35% to pre-tax income due to the following:
UNS Energy TEPYear Ended December 31,
Years Ended December 31,
2013 2012 2011 2013 2012 2011
Millions of Dollars
(in millions)2015 2014 2013
Federal Income Tax Expense at Statutory Rate$65
 $51
 $62
 $52
 $37
 $48
$70
 $56
 $52
State Income Tax Expense, Net of Federal Deduction8
 7
 8
 7
 5
 6
8
 7
 7
Federal/State Tax Credits(2) (1) (3) (2) (1) (2)(8) (5) (2)
Allowance for Equity Funds Used During Construction(2) (1) (1) (1) (1) (1)(1) (2) (1)
Deferred Tax Asset Valuation Allowance
 
 
 2
 
 
1
 
 2
Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset(11) 
 
 (11) 
 

 
 (11)
Other
 
 1
 1
 (1) 1
2
 2
 1
Total Federal and State Income Tax Expense$58
 $56
 $67
 $48
 $39
 $52
$72
 $58
 $48

85


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset
Renewable energy assets are eligible for investment tax credits. We reduce the income tax basis of those qualifying assets by half of the related investment tax credit. Historically, the difference between the income tax basis of the assetassets and the book basis under GAAP was recorded as a deferred tax liability with an offsetting charge to income tax expense in the year the qualifying asset was placed in service. In June 2013, we recorded a regulatory asset and corresponding reduction of income tax expense of $11 million to recover previously recorded income tax expense through future rates as a result of the 2013 TEP Rate Order. The regulatory asset will be amortized as income tax expense as the qualifying assets are depreciated.
Income tax expense included in the income statements consists of the following:
UNS Energy TEPYear Ended December 31,
Years Ended December 31,
2013 2012 2011 2013 2012 2011
Millions of Dollars
Current Tax Expense (Benefit):           
(in millions)2015 2014 2013
Current Tax Expense (Benefit)     
Federal$(11) $(2) $(7) $(8) $(4) $(5)$
 $(1) $(8)
State(2) (2) (2) (2) (2) (2)
 
 (2)
Total Current Tax Expense (Benefit)(13) (4) (9) (10) (6) (7)
 (1) (10)
Deferred Tax Expense (Benefit):           
Deferred Tax Expense (Benefit)     
Federal61
 51
 64
 47
 38
 50
66
 54
 47
Federal Investment Tax Credits(1) 
 (1) (1) 
 (1)(6) (4) (1)
State11
 9
 13
 12
 7
 10
12
 9
 12
Total Deferred Tax Expense (Benefit)71
 60
 76
 58
 45
 59
72
 59
 58
Total Federal and State Income Tax Expense$58
 $56
 $67
 $48
 $39
 $52
$72
 $58
 $48

K-115

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



The significant components of deferred income tax assets and liabilities consist of the following:
UNS Energy TEPDecember 31,
December 31, December 31,
2013 2012 2013 2012
Millions of Dollars
Gross Deferred Income Tax Assets:       
(in millions)2015 2014
Gross Deferred Income Tax Assets   
Capital Lease Obligations$127
 $141
 $127
 $141
$27
 $96
Net Operating Loss Carryforwards94
 72
 104
 85
156
 187
Customer Advances and Contributions in Aid of Construction33
 34
 19
 19
20
 19
Alternative Minimum Tax Credit43
 43
 24
 24
24
 24
Accrued Postretirement Benefits23
 23
 23
 23
23
 23
Renewable Energy Credit Up-Front Incentive Payments
 26
 
 20
Emission Allowance Inventory10
 10
 10
 10
9
 10
Unregulated Investment Losses7
 9
 
 
Investment Tax Credit Carryforward32
 31
Other50
 44
 44
 43
53
 54
Total Gross Deferred Income Tax Assets387
 402
 351
 365
344
 444
Deferred Tax Assets Valuation Allowance(7) (7) (2) 
(4) (2)
Gross Deferred Income Tax Liabilities:       
Plant – Net(708) (648) (615) (571)
Capital Lease Assets – Net(47) (34) (47) (34)
Gross Deferred Income Tax Liabilities   
Plant, Net(750) (699)
Capital Lease Assets, Net(12) (74)
Pensions(21) (23) (22) (24)(27) (27)
PPFAC(5) (6) (2) (3)
 (8)
Other(21) (15) (20) (15)(19) (24)
Total Gross Deferred Income Tax Liabilities(802) (726) (706) (647)(808) (832)
Net Deferred Income Tax Liabilities$(422) $(331) $(357) $(282)$(468) $(390)

86


The net deferred income tax liability on the balance sheet is as follows:NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



 UNS Energy TEP
 December 31, December 31,
 2013 2012 2013 2012
 Millions of Dollars
Deferred Income Taxes – Current Assets$60
 $34
 $64
 $37
Deferred Income Taxes – Noncurrent Liabilities(482) (365) (421) (319)
Net Deferred Income Tax Liability$(422) $(331) $(357) $(282)
The unregulated investment loss deferred tax asset includes $7 million of capital loss at December 31, 2013 and December 31, 2012. The deferred tax asset can only be used if the companyTEP has capital gains to offset the losses. Management believes that it is more likely than not that the company will not be able to generate future capital gains. As a result, UNS Energy recorded a $7$4 million valuation allowance against thecredit and loss carryforward deferred tax asset as ofassets at December 31, 2013,2015 and December 31, 2012. Management believes that based on its historical pattern of taxable income, UNS Energy will produce sufficient income in the future to realize all other deferred income tax assets. TEP has recorded a $2 million valuation allowance against state tax credit carryforward deferred tax assets at December 31, 2013.2014. Management believes TEP will not produce sufficient taxable income to use all state tax creditscredit and loss carryforwards before they expire.

K-116

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Income Tax Position
As of December 31, 2013, UNS Energy and2015, TEP had the following carryforward amounts:
UNS Energy TEP
Amount Expiring Year Amount Expiring Year
Millions of Dollars   Millions of Dollars  
Capital Loss$7
 2015 $
 N/A
(in millions)Amount Expiring Year
Federal Net Operating Loss266
 2031-33 286
 2031-33$430
 2031-34
State Net Operating Loss30
 2032-33 99
 2016-33114
 2016-34
State Credits5
 2016-18 6
 2016-1810
 2016-30
Alternative Minimum Tax Credit43
 None 24
 None24
 None
Investment Tax Credits6
 2032-33 6
 2032-3332
 2032-35
If the pending Merger is approved there would be an annual limitation on the amount of carryforwards that can be utilized.
Excess Tax Benefit Realized from Share-Based Compensation Plans
UNS Energy records excess tax benefits as an increase to Common Stock when tax deductions for share-based compensation exceed the expense recorded in the financial statements and they result in a reduction to income taxes payable. As of December 31, 2013, UNS Energy had $4 million of excess tax benefits that were not recorded in Common Stock. The excess benefits will be recorded in Common Stock when the Federal net operating loss carryforwards of $266 million are used.
Uncertain Tax PositionsOBLIGATIONS AND FUNDED STATUS
A reconciliationWe measured the actuarial present values of the beginningall pension benefit obligations and ending balances of unrecognized tax benefits follows:
 UNS Energy TEP
 December 31, December 31,
 2013 2012 2013 2012
 Millions of Dollars
Unrecognized Tax Benefits, Beginning of Year$30
 $29
 $23
 $24
Additions Based on Tax Positions Taken in the Current Year2
 5
 1
 3
Reductions of Positions from Prior Year Based on Tax Authority Ruling(28) (4) (22) (4)
Unrecognized Tax Benefits, End of Year$4
 $30
 $2
 $23
Unrecognized tax benefits, if recognized, would not reduce income tax expenseother retiree benefit plans at December 31, 2013. Unrecognized tax benefits, if recognized, would reduce income tax expense by $1 million at December 31, 2012 for both UNS Energy2015 and TEP.
UNS Energy and TEP recognized a $1 million reduction to interest expense2014. The table below includes all of TEP’s plans. All plans have projected benefit obligations in 2013 and no reduction in 2012. UNS Energy and TEP had no interest payable balance at December 31, 2013 and $1 million at December 31, 2012. We have no penalties accrued in the years presented.
In February 2013, we received a favorable ruling from the Internal Revenue Service (IRS) allowing us to deduct up-front incentive payments to customers who install renewable energy resources.  These customers transfer environmental attributes or RECs associated with their renewable installations to us over the expected lifeexcess of the contractfair value of plan assets for an up-front incentive payment based on the generating capacityeach period presented. The status of their installation.  As a result of the IRS ruling in the first quarter of 2013, UNS Energy reduced unrecognized tax benefits by $28 million,our pension benefit and TEP reduced unrecognized tax benefits by other retiree benefit plans are summarized below:$22 million. The changes in tax benefits primarily affected the balance sheets.
UNS Energy and TEP have been audited by the IRS through tax year 2010 and the IRS has provided notice of intent to audit the 2011 tax returns. UNS Energy and TEP are not currently under audit by any state tax agencies. The balance in unrecognized tax benefits could change in the next 12 months as a result of ongoing IRS audits, but we are unable to determine the amount of change.
 Pension Benefits Other Retiree Benefits
 Year Ended December 31,
(in millions)2015 2014 2015 2014
Change in Projected Benefit Obligation       
Benefit Obligation at Beginning of Year$407
 $330
 $81
 $74
Actuarial (Gain) Loss(22) 67
 (5) 5
Interest Cost17
 16
 3
 3
Service Cost12
 10
 4
 4
Benefits Paid(20) (16) (5) (5)
Projected Benefit Obligation at End of Year394
 407
 78
 81
Change in Plan Assets       
Fair Value of Plan Assets at Beginning of Year335
 307
 12
 10
Actual Return on Plan Assets(3) 35
 
 1
Benefits Paid(20) (16) (5) (5)
Employer Contributions (1)
24
 9
 6
 6
Fair Value of Plan Assets at End of Year336
 335
 13
 12
Funded Status at End of Year$(58) $(72) $(65) $(69)
(1)
In 2016, TEP expects to contribute $10 million to the pension plans.

K-11774


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Tangible Property Regulations
In September 2013,The following table provides the U.S. Treasury Department released final income tax regulations on the deductioncomponents of TEP’s regulatory assets and capitalizationaccumulated other comprehensive loss that have not been recognized as components of expenditures related to tangible property. These final regulations apply to tax years beginning on or after January 1, 2014. Severalnet periodic benefit cost as of the provisions within the regulations will require a tax accounting method change to be filed with the IRS resultingdates presented:
 Pension Benefits Other Retiree Benefits
 Year Ended December 31,
(in millions)2015 2014 2015 2014
Net Loss$117
 $118
 $6
 $11
Prior Service Cost (Benefit)3
 4
 (1) (2)
The accumulated benefit obligation aggregated for all pension plans is $355 million and $365 million at December 31, 2015 and 2014, respectively.
All three of our pension plans had accumulated benefit obligations in a cumulative effect adjustment. The adoptionexcess of these regulations by UNS Energy and TEP resulted in a $4 million increase to plant-related deferred tax liabilities and net operating loss deferred taxplan assets at December 31, 2013.2014. As a result of increases in discount rates and employer contributions, two of our plans had accumulated benefit obligations in excess of plan assets at December 31, 2015. The following table includes information for pension plans with accumulated benefit obligations in excess of pension plan assets:

NOTE 10. EMPLOYEE BENEFIT PLANS
 December 31,
(in millions)2015 2014
Accumulated Benefit Obligation$188
 $365
Fair Value of Plan Assets169
 335
PENSION BENEFIT PLANSNet periodic benefit plan cost includes the following components:
 Pension Benefits Other Retiree Benefits
 Year Ended December 31,
(in millions)2015 2014 2013 2015 2014 2013
Service Cost$12
 $10
 $11
 $4
 $4
 $3
Interest Cost17
 16
 14
 3
 3
 3
Expected Return on Plan Assets(23) (21) (19) (1) (1) (1)
Actuarial Loss Amortization7
 3
 8
 
 
 
Net Periodic Benefit Cost$13
 $8
 $14
 $6
 $6
 $5
Approximately 20% of the net periodic benefit cost was capitalized as a cost of construction and the remainder was included in income.
We sponsor three noncontributory, definedmeasured service and interest costs for pension and other postretirement benefits utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. At the end of 2015, we changed our approach to determine the service and interest cost components of pension and other postretirement benefit pension plans for substantially all employeesexpense. We elected to measure service and certain affiliate employees. Benefits are based on yearsinterest costs by applying the specific spot rates along that yield curve to the plans' liability cash flows beginning in 2016. TEP believes the new approach provides a more precise measurement of service and average compensation.interest costs by aligning the timing of the plans' liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations nor the funded status. We fund theaccounted for this change as a change in accounting estimate, and accordingly, have accounted for it on a prospective basis.
The changes in plan assets and benefit obligations recognized as regulatory assets or in AOCI are as follows:
 Pension Benefits
 Regulatory Asset AOCI
(in millions)2015 2014 2013 2015 2014 2013
Current Year Actuarial (Gain) Loss$5
 $49
 $(42) $
 $3
 $(1)
Amortization of Actuarial Gain (Loss)(7) (3) (8) 
 
 
Total Recognized (Gain) Loss$(2) $46
 $(50) $
 $3
 $(1)

75



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



 Other Retiree Benefits
 Regulatory Asset
(in millions)2015 2014 2013
Current Year Actuarial (Gain) Loss$(4) $5
 $(6)
For all pension plans, by contributing at leastwe amortize prior service costs on a straight-line basis over the minimum amount requiredaverage remaining service period of employees expected to receive benefits under Internal Revenue Service (IRS) regulations.
the plan. We also maintain a Supplemental Executive Retirement Plan (SERP) for executive management.
OTHER RETIREE BENEFIT PLANS
TEP provides limited health careexpect to amortize an estimated $7 million net loss from pension regulatory assets and life insurance benefits for retirees. Active TEP employees may become eligible for these benefits if they reach retirement age while working for TEP or an affiliate. UNS Electric and UNS Gas provide retiree medical benefits for current retirees. UNS Electric's and UNS Gas' active employees are not eligible for retiree medical benefits.
TEP funds its other retiree benefits for classified employees through a Voluntary Employee Beneficiary Association (VEBA). TEP contributed $3estimated $1 million in each of 2013 and 2012 and $2 million in 2011 to the VEBA. Other retiree benefits for unclassified employees are self funded.
TEP’sprior service credit from other retiree benefit plan was amendedregulatory assets into net periodic benefit cost in 20122016.
The following table includes the weighted average assumptions used to determine benefit obligations:
 Pension Benefits Other Retiree Benefits
 2015 2014 2015 2014
Discount Rate4.5-4.6% 4.1-4.2% 4.2% 3.9%
Rate of Compensation Increase3.0% 3.0% N/A N/A
The following table includes the weighted average assumptions used to determine net periodic benefit costs:
 Pension Benefits Other Retiree Benefits
 2015 2014 2013 2015 2014 2013
Discount Rate4.1%-4.2% 5.0%-5.1% 4.1%-4.1% 3.9% 4.7% 3.8%
Rate of Compensation Increase3.0% 3.0% 3.0% N/A N/A N/A
Expected Return on Plan Assets7.0% 7.0% 7.0% 7.0% 7.0% 7.0%
Net periodic benefit cost is subject to various assumptions and determinations, such as the discount rate, the rate of compensation increase, and the participant contributionsexpected return on plan assets.
We use a combination of sources in selecting the expected long-term rate-of-return-on-assets assumption, including an investment return model. The model used provides a “best-estimate” range over 20 years from the 25th percentile to the 75th percentile. The model, used as a guideline for classified employees who retire after February 1, 2014.selecting the overall rate-of-return-on-assets assumption, is based on forward looking return expectations only. The effectabove method is used for all asset classes.
Changes that may arise over time with regard to these assumptions and determinations will change amounts recorded in the future as net periodic benefit cost. The following table includes the assumed health care cost trend rates:
 December 31,
 2015 2014
Next Year7.6% 6.7%
Ultimate Rate Assumed4.5% 4.5%
Year Ultimate Rate is Reached2036 2027
Assumed health care cost trend rates significantly affect the amounts reported for health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects on the December 31, 2015 amounts:
(in millions)
One-Percentage-
Point Increase
 
One-Percentage-
Point Decrease
Effect on Total Service and Interest Cost Components$1
 $1
Effect on Retiree Benefit Obligation6
 5

76



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



PENSION PLAN AND OTHER RETIREE BENEFIT ASSETS
Pension Assets
We calculate the fair value of plan assets on December 31, the measurement date. Pension plan asset allocations, by asset category, on the measurement date were as follows:
 2015 2014
Asset Category 
Equity Securities49% 48%
Fixed Income Securities41% 43%
Real Estate8% 7%
Other2% 2%
Total100% 100%
The following table sets forth the fair value measurements of pension plan assets by level within the fair value hierarchy:
 
Quoted Prices in
Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 Total
(in millions)December 31, 2015
Asset Category       
Cash Equivalents$1
 $
 $
 $1
Equity Securities:       
United States Large Cap
 81
 
 81
United States Small Cap
 17
 
 17
Non-United States
 67
 
 67
Fixed Income
 137
 
 137
Real Estate
 8
 18
 26
Private Equity
 
 7
 7
Total$1
 $310
 $25
 $336
        
(in millions)December 31, 2014
Asset Category       
Cash Equivalents$1
 $
 $
 $1
Equity Securities:      

United States Large Cap
 82
 
 82
United States Small Cap
 17
 
 17
Non-United States
 61
 
 61
Fixed Income
 143
 
 143
Real Estate
 8
 16
 24
Private Equity
 
 7
 7
Total$1
 $311
 $23
 $335
Level 1 cash equivalents are based on observable market prices and are comprised of the fair value of commercial paper, money market funds, and certificates of deposit.
Level 2 investments comprise amounts held in commingled equity funds, United States bond funds, and real estate funds. Valuations are based on active market quoted prices for assets held by each respective fund.
Level 3 real estate investments were valued using a real estate index value. The real estate index value was developed based on appraisals comprising 100% of real estate assets tracked by the index.
Level 3 private equity funds are classified as funds-of-funds. They are valued based on individual fund manager valuation models.

77



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



The following table sets forth a reconciliation of changes in the fair value of pension assets classified as Level 3 in the fair value hierarchy. There were no transfers in or out of Level 3.
(in millions)Private Equity Real Estate Total
Beginning Balance at January 1, 2014$7
 $14
 $21
Actual Return on Plan Assets:    

Assets Held at Reporting Date1
 2
 3
Purchases, Sales, and Settlements(1) 
 (1)
Ending Balance at December 31, 20147
 16
 23
Actual Return on Plan Assets:     
Assets Held at Reporting Date1
 2
 3
Purchases, Sales, and Settlements(1) 
 (1)
Ending Balance at December 31, 2015$7
 $18
 $25
Pension Plan Investments
Investment Goals
Asset allocation is the principal method for achieving each pension plan’s investment objectives while maintaining appropriate levels of risk. We consider the projected impact on benefit obligation was less than $1 million.security of any proposed changes to the current asset allocation policy. The expected long-term returns and implications for pension plan sponsor funding are reviewed in selecting policies to ensure that current asset pools are projected to be adequate to meet the expected liabilities of the pension plans. We expect to use asset allocation policies weighted most heavily to equity and fixed income funds, while maintaining some exposure to real estate and opportunistic funds. Within the fixed income allocation, long-duration funds may be used to partially hedge interest rate risk.
REGULATORY RECOVERYRisk Management
We recordrecognize the difficulty of achieving investment objectives in light of the uncertainties and complexities of the investment markets. We also recognize some risk must be assumed to achieve a pension plan’s long-term investment objectives. In establishing risk tolerances, the following factors affecting risk tolerance and risk objectives will be considered: plan status, plan sponsor financial status and profitability, plan features, and workforce characteristics. We have determined that the pension plans can tolerate some interim fluctuations in market value and rates of return in order to achieve long-term objectives. TEP tracks each pension plan’s portfolio relative to the benchmark through quarterly investment reviews. The reviews consist of a performance and risk assessment of all investment categories and on the portfolio as a whole. Investment managers for the pension plan may use derivative financial instruments for risk management purposes or as part of their investment strategy. Currency hedges may also be used for defensive purposes.
Relationship between Plan Assets and Benefit Obligations
The overall health of each plan will be monitored by comparing the value of plan obligations (both Accumulated Benefit Obligation and Projected Benefit Obligation) against the fair value of assets and tracking the changes in each. The frequency of this monitoring will depend on the availability of plan data, but will be no less frequent than annually via actuarial valuation.

78



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Target Allocation Percentages
The current target allocation percentages for the major asset categories of the plan as of December 31, 2015 follow. Each plan allows a variance of +/- 2% from these targets before funds are automatically rebalanced.
 TEP Plans VEBA Trust
Cash/Treasury Bills—% 2%
Equity Securities:   
United States Large Cap24% 39%
United States Small Cap5% 5%
Non-United States Developed15% 7%
Non-United States Emerging5% 9%
Fixed Income42% 38%
Real Estate8% —%
Private Equity1% —%
Total100% 100%
Pension Fund Descriptions
For each type of asset category selected by the Pension Committee, our non-SERPinvestment consultant assembles a group of third-party fund managers and allocates a portion of the total investment to each fund manager. In the case of the private equity fund, our investment consultant directs investments to a private equity manager that invests in third-parties’ funds.
Other Retiree Benefit Assets
As of December 31, 2015, the fair value of VEBA trust assets was $13 million, of which $5 million were fixed income investments and $8 million were equities. As of December 31, 2014, the fair value of VEBA trust assets was $12 million, of which $4 million were fixed income investments and $8 million were equities. The VEBA trust assets are primarily Level 2. There are no Level 3 assets in the VEBA trust.
ESTIMATED FUTURE BENEFIT PAYMENTS
TEP expects the following benefit payments to be made by the defined benefit pension plans and other retiree benefit plan, not yet reflected in net periodic benefit cost,which reflect future service, as appropriate.
(in millions)2016 2017 2018 2019 2020 2021-2025
Pension Benefits$17
 $18
 $19
 $21
 $22
 $125
Other Retiree Benefits5
 5
 5
 6
 6
 33
DEFINED CONTRIBUTION PLAN
We offer a defined contribution savings plan to all eligible employees. The Internal Revenue Code identifies the plan as a regulatory asset, as such amounts are probablequalified 401(k) plan. Participants direct the investment of future recoverycontributions to certain funds in their account. We match part of a participant’s contributions to the rates chargedplan. TEP made matching contributions to retail customers. Changesthe plan of $5 million in the SERP obligation, not yet reflected2015, 2014, and 2013.

NOTE 9. SHARE-BASED COMPENSATION
2011 STOCK AND INCENTIVE PLAN
The Fortis acquisition of UNS Energy in net periodic benefit cost, are recorded2014 resulted in Other Comprehensive Income since SERPaccelerated vesting and expense is not currently recoverable in rates.
The pension and other retiree benefit related amounts (excluding tax balances) included onrecognition of all outstanding non-vested UNS Energy share-based awards issued under the UNS Energy balance sheet are:
 Pension Benefits 
Other  Retiree
Benefits
 Years Ended December 31,
 2013 2012 2013 2012
 Millions of Dollars
Regulatory Pension Asset Included in Other Regulatory Assets$75
 $129
 $4
 $10
Accrued Benefit Liability Included in Accrued Employee Expenses(1) (1) (2) (2)
Accrued Benefit Liability Included in Pension and Other Retiree Benefits(28) (90) (63) (69)
Accumulated Other Comprehensive Loss (related to SERP)2
 4
 
 
Net Amount Recognized$48
 $42
 $(61) $(61)
2011 Omnibus Stock and Incentive Plan (2011 Plan). The table above includes accrued pension benefit liabilities for UNS Electric and UNS Gasoutstanding non-vested awards would otherwise have been recognized over remaining vesting periods through February 2017. TEP recognized approximately $2 million of approximatelyexpense in 2014 due to the accelerated vesting of the awards. TEP recorded total share-based compensation expense of $5 million atfor the year ended December 31, 20132014 and $9$3 million atfor the year ended December 31, 2012. The table also includes an other retiree benefit liability of $1 million for2013. In August 2014, UNS Electric and UNS Gas for each period presented.Energy settled all outstanding share-based compensation awards related to the 2011 Plan in cash.

K-11879


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



2015 SHARE UNIT PLAN
The Human Resources and Governance Committee (Committee) of UNS Energy, approved and UNS Energy's Board of Directors ratified the 2015 Share Unit Plan (Plan) effective as of January 1, 2015. Under the Plan, key employees, including executive officers of UNS Energy and its subsidiaries, may be granted long-term incentive awards of performance-based share units (PSUs) and time-based restricted share units (RSUs) annually. Each PSU and RSU granted will be valued based on one share of Fortis common stock converted to U.S. dollars. Fortis common stock is traded on the Toronto Stock Exchange. TEP’s share of the obligation and expense as a subsidiary of UNS Energy is allocated based on the Massachusetts Formula.
UNS Energy awarded 47,776 PSUs and 23,888 RSUs in 2015 that are payable on the third anniversary of the grant date. The awards are classified as liability awards based on the cash settlement feature. Liability awards are measured at their fair value at the end of each reporting period and will fluctuate based on the price of Fortis common stock as well as the level of achievement of the financial performance criteria. At December 31, 2015, TEP's allocated share of probable payout is $2 million.
TEP's allocated portion of the compensation expense is recognized in Operations and Maintenance on the Consolidated Statements of Income. Compensation expense associated with unvested PSUs and RSUs is recognized on a straight-line basis over the minimum required service period in an amount equal to the fair value on the measurement date or each reporting period. TEP recorded $1 million for the year ended December 31, 2015 based on its share of UNS Energy's compensation expense.

NOTE 10. SUPPLEMENTAL CASH FLOW INFORMATION
CASH TRANSACTIONS
 Year Ended December 31,
(in millions)2015 2014 2013
Interest, Net of Amounts Capitalized$65
 $83
 $53
Income Taxes
 
 
NON-CASH TRANSACTIONS
Other significant non-cash investing and financing activities that affected recognized assets and liabilities but did not result in cash receipts or payments were as follows:
 Year Ended December 31,
(in millions)2015 2014 2013
Accrued Capital Expenditures$28
 $29
 $24
Net Cost of Removal of Interim Retirements (1)
1
 12
 25
Commitment to Purchase Capital Lease Interests
 109
 55
Capital Lease Obligations (2)

 1
 9
Proceeds from Issuance of Long-Term Debt Deposited in Trust
 
 191
Asset Retirement Obligations (3)
3
 4
 8
(1)
The non-cash net cost of removal of interim retirements represents an accrual for future asset retirement obligations that does not impact earnings.
(2)
The non-cash change in capital lease obligations represents interest accrued for accounting purposes in excess of interest payments.
(3)
The non-cash additions to asset retirement obligations and related capitalized assets represent a revision of estimated asset retirement cost due to changes in timing and amount of the expected future asset retirement obligations.

NOTE 11. FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS
We categorize our financial instruments into the three-level hierarchy based on inputs used to determine the fair value. Level 1 inputs are unadjusted quoted prices for identical assets or liabilities in an active market. Level 2 inputs include quoted prices for similar assets or liabilities, quoted prices in non-active markets, and pricing models whose inputs are observable, directly or

80



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



indirectly. Level 3 inputs are unobservable and supported by little or no market activity. Transfers between levels are recorded at the end of a reporting period. There were no transfers between levels in the periods presented.
FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS
The following tables present, by level within the fair value hierarchy, TEP’s assets and liabilities accounted for at fair value on a recurring basis. These assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
 Level 1 Level 2 Level 3 Total
(in millions)December 31, 2015
Assets 
Cash Equivalents(1)
$33
 $
 $
 $33
Restricted Cash(1)
4
 
 
 4
Energy Derivative Contracts - Regulatory Recovery(2)

 1
 
 1
Energy Derivative Contracts - No Regulatory Recovery(2)

 
 1
 1
Total Assets37
 1
 1
 39
Liabilities       
Energy Derivative Contracts - Regulatory Recovery(2)

 (10) (3) (13)
Interest Rate Swap(3)

 (3) 
 (3)
Total Liabilities
 (13) (3) (16)
Net Total Assets (Liabilities)$37
 $(12) $(2) $23
(in millions)December 31, 2014
Assets 
Cash Equivalents(1)
$15
 $
 $
 $15
Restricted Cash(1)
2
 
 
 2
Energy Derivative Contracts - Regulatory Recovery(2)
��
 
 2
 2
Total Assets17
 
 2
 19
Liabilities       
Energy Derivative Contracts - Regulatory Recovery(2)

 (9) (9) (18)
Energy Derivative Contracts - No Regulatory Recovery(2)

 
 (1) (1)
Energy Derivative Contracts - Cash Flow Hedge(2)

 
 (1) (1)
Interest Rate Swap(3)

 (5) 
 (5)
Total Liabilities
 (14) (11) (25)
Net Total Assets (Liabilities)$17
 $(14) $(9) $(6)
(1)
Cash Equivalents and Restricted Cash represent amounts held in money market funds and certificates of deposit valued at cost, including interest, which approximates fair market value. Cash Equivalents are included in Cash and Cash Equivalents on the Consolidated Balance Sheets. Restricted Cash is included in Investments and Other Property on the Consolidated Balance Sheets.
(2)
Energy Contracts include gas swap agreements (Level 2), power options (Level 2), gas options (Level 3), forward power purchase and sales contracts (Level 3) entered into to reduce exposure to energy price risk, and, at December 31, 2014 a power sale option (Level 3). These contracts are included in Derivative Instruments on the Consolidated Balance Sheets. The valuation techniques are described below.
(3)
The Interest Rate Swap is valued using an income valuation approach based on the 6-month LIBOR and is included in Derivative Instruments on the Consolidated Balance Sheets.

81


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



All energy derivative contracts are subject to legally enforceable master netting arrangements to mitigate credit risk. We present derivatives on a gross basis on the balance sheet. The tables below presents the potential offset of counterparty netting and cash collateral.
 Gross Amount Recognized on the Balance Sheets Gross Amount Not Offset on the Balance Sheets Net Amount
  Counterparty Netting of Energy Contracts Cash Collateral Received/Posted 
(in millions)December 31, 2015
Derivative Assets       
Energy Derivative Contracts$2
 $1
 $
 $1
Derivative Liabilities       
Energy Derivative Contracts(13) (1) 
 (12)
Interest Rate Swap(3) 
 
 (3)
(in millions)December 31, 2014
Derivative Assets       
Energy Derivative Contracts$2
 $2
 $
 $
Derivative Liabilities       
Energy Derivative Contracts(20) (2) 
 (18)
Interest Rate Swap(5) 
 
 (5)
DERIVATIVE INSTRUMENTS
We enter into various derivative and non-derivative contracts to reduce our exposure to energy price risk associated with our gas and purchased power requirements. The objectives for entering into such contracts include: creating price stability; meeting load and reserve requirements; and reducing exposure to price volatility that may result from delayed recovery under the PPFAC.
We primarily apply the market approach for recurring fair value measurements. When we have observable inputs for substantially the full term of the asset or liability or use quoted prices in an inactive market, we categorize the instrument in Level 2. We categorize derivatives in Level 3 when we use an aggregate pricing service or published prices that represent a consensus reporting of multiple brokers.
For both power and gas prices we obtain quotes from brokers, major market participants, exchanges, or industry publications and rely on our own price experience from active transactions in the market. We primarily use one set of quotations each for power and for gas and then validate those prices using other sources. We believe that the market information provided is reflective of market conditions as of the time and date indicated.
Published prices for energy derivative contracts may not be available due to the nature of contract delivery terms such as non-standard time blocks and non-standard delivery points. In these cases, we apply adjustments based on historical price curve relationships, transmission, and line losses.
We estimate the fair value of our gas options using a Black-Scholes-Merton option pricing model which includes inputs such as implied volatility, interest rates, and forward price curves.
The December 31, 2014 valuation of our power sale option was a function of observable market variables, regional power and gas prices, as well as the ratio between the two, which represents the prevailing market heat rate.
We also consider the impact of counterparty credit risk using current and historical default and recovery rates, as well as our own credit risk using credit default swap data.
The inputs and our assessments of the significance of a particular input to the fair value measurements require judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. We review the assumptions underlying our price curves monthly.
Cash Flow Hedges
We can enter into interest rate swaps to mitigate the exposure to volatility in variable interest rates on debt. We have an interest rate swap agreement that expires January 2020. We also had a power purchase swap to hedge the cash flow risk associated with

82


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



a long-term power supply agreement which expired in September 2015. The after-tax unrealized gains and losses on cash flow hedge activities are reported in the statement of comprehensive income. The loss expected to be reclassified to earnings within the next twelve months is estimated to be $1 million. The realized losses from our cash flow hedges are shown in the following table:
 Year Ended December 31,
(in millions)2015 2014 2013
Capital Lease Interest Expense$2
 $2
 $2
Long-Term Debt Interest Expense
 1
 1
Purchased Power1
 1
 1
As of December 31, 2015, the total notional amount of our interest rate swap was $29 million.
Energy Derivative Contracts - Regulatory Recovery
We record unrealized gains and losses on energy purchase contracts that are recoverable through the PPFAC on the balance sheet as a regulatory asset or a regulatory liability rather than reporting the transaction in the income statement or in the statement of other comprehensive income, as shown in following table:
 Year Ended December 31,
(in millions)2015 2014 2013
Unrealized Net Gain (Loss) Recorded to Regulatory (Assets) Liabilities$6
 $(18) $
Energy Derivative Contracts - No Regulatory Recovery
Forward contracts with long-term wholesale customers do not qualify for regulatory recovery. For these contracts that qualify as derivatives, we record unrealized gains and losses in the income statement, unless and until a normal purchase or normal sale election is made. In February 2015, TEP made a normal sale election for a three-year sales option contract entered into in December 2014. In June 2015, TEP entered into long-term power trading contracts that qualify as derivatives but do not qualify for regulatory recovery. The unrealized gains and losses on the long-term power trading contracts are recorded in the income statement, and 10% of any gains will be shared with ratepayers through the PPFAC, as realized.
Derivative Volumes
At December 31, 2015, we have energy contracts that will settle through the fourth quarter of 2018. The volumes associated with our energy contracts were as follows:
 December 31,
 2015 2014
Power Contracts GWh1,752
 2,604
Gas Contracts GBtu17,214
 19,932

83


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Level 3 Fair Value Measurements
The following table provides quantitative information regarding significant unobservable inputs in TEP’s Level 3 fair value measurements:
 Valuation Fair Value of   Range of
 Approach Assets Liabilities Unobservable Inputs Unobservable Input
(in millions)December 31, 2015
Forward Power ContractsMarket approach $1
 $(2) Market price per MWh $19.20
 $31.35
            
Gas Option ContractsOption model 
 (1) Market price per MMbtu $2.17
 $2.69

      Gas volatility 31.0% 58.3%
Level 3 Energy Contracts  $1
 $(3)      
            
(in millions)December 31, 2014
Forward Power ContractsMarket approach $1
 $(6) Market price per MWh $22.35
 $39.05
            
Power Sale OptionMarket approach 1
 (1) Market price per MWh $27.75
 $44.94
       Market price per MMbtu $2.88
 $4.02
            
Gas Option ContractsOption model 
 (4) Market price per MMbtu $2.72
 $3.26
       Gas volatility 30.8% 53.3%
Level 3 Energy Contracts  $2
 $(11)      
Changes in one or more of the unobservable inputs could have a significant impact on the fair value measurement depending on the magnitude of the change and the direction of the change for each input. The impact of changes to fair value, including changes from unobservable inputs, are subject to recovery or refund through the PPFAC mechanism and are reported on the balance sheet as a regulatory asset or regulatory liability, or as a component of other comprehensive income, rather than in the income statement.
The following table presents a reconciliation of changes in the fair value of assets and liabilities classified as Level 3 in the fair value hierarchy:
 Year Ended December 31,
(in millions)2015 2014
Beginning of Period$(9) $(2)
Gains (Losses) Recorded to:(1)
   
Net Regulatory Assets/Liabilities – Derivative Instruments(4) (8)
Electric Wholesale Sales3
 
Settlements8
 1
End of Period$(2) $(9)
(1)
Includes gains (losses) attributable to the change in unrealized gains/(losses) relating to assets (liabilities) still held at the end of the period of $(1) million and $(8) million for the years ended December 31, 2015, and 2014, respectively.
CREDIT RISK
The use of contractual arrangements to manage the risks associated with changes in energy commodity prices creates credit risk exposure resulting from the possibility of non-performance by counterparties pursuant to the terms of their contractual obligations. We enter into contracts for the physical delivery of energy and gas which contain remedies in the event of non-performance by the supply counterparties. In addition, volatile energy prices can create significant credit exposure from energy market receivables and subsequent measurement at fair value.
We have contractual agreements for energy procurement and hedging activities that contain certain provisions requiring each company to post collateral under certain circumstances. These circumstances include: exposures in excess of unsecured credit

84


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



limits; credit rating downgrades; or a failure to meet certain financial ratios. In the event that such credit events were to occur, we would have to provide certain credit enhancements in the form of cash or LOCs to fully collateralize our exposure to these counterparties.
We consider the effect of counterparty credit risk in determining the fair value of derivative instruments that are in a net asset position after incorporating collateral posted by counterparties and allocate the credit risk adjustment to individual contracts. We also consider the impact of our own credit risk after considering collateral posted on instruments that are in a net liability position and allocate the credit risk adjustment to all individual contracts.
Material adverse changes could trigger credit risk-related contingent features. At December 31, 2015, the value of all derivative instruments in net liability positions under contracts with credit risk-related contingent features, including contracts under the normal purchase normal sale exception, was $20 million, compared with $27 million at December 31, 2014. At December 31, 2015, TEP had less than $1 million of LOCs as credit enhancements with its counterparties. If the credit risk-related contingent features were triggered on December 31, 2015, TEP would have been required to post an additional $20 million of collateral of which $8 million relates to outstanding net payable balances for settled positions.
FINANCIAL INSTRUMENTS NOT CARRIED AT FAIR VALUE
The fair value of a financial instrument is the market price to sell an asset or transfer a liability at the measurement date. We use the following methods and assumptions for estimating the fair value of our financial instruments:
Borrowings under revolving credit facilities approximate the fair values due to the short-term nature of these financial instruments. These items have been excluded from the table below.
For long-term debt, we use quoted market prices, when available, or calculate the present value of remaining cash flows at the balance sheet date. When calculating present value, we use current market rates for bonds with similar characteristics such as credit rating and time-to-maturity. We consider the principal amounts of variable rate debt outstanding to be reasonable estimates of the fair value. We also incorporate the impact of our own credit risk using a credit default swap rate.
The use of different estimation methods and/or market assumptions may yield different estimated fair value amounts. The following table includes the face value and estimated fair value of our long-term debt:
 
Fair Value
Hierarchy
 Face Value Fair Value
   December 31,
(in millions)  2015 2014 2015 2014
Liabilities         
Long-Term Debt, including Current MaturitiesLevel 2 $1,466
 $1,375
 $1,529
 $1,457

NOTE 12. INCOME TAXES
Income tax expense differs from the amount of income tax determined by applying the United States statutory federal income tax rate of 35% to pre-tax income due to the following:
 Year Ended December 31,
(in millions)2015 2014 2013
Federal Income Tax Expense at Statutory Rate$70
 $56
 $52
State Income Tax Expense, Net of Federal Deduction8
 7
 7
Federal/State Tax Credits(8) (5) (2)
Allowance for Equity Funds Used During Construction(1) (2) (1)
Deferred Tax Asset Valuation Allowance1
 
 2
Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset
 
 (11)
Other2
 2
 1
Total Federal and State Income Tax Expense$72
 $58
 $48

85


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset
Renewable energy assets are eligible for investment tax credits. We reduce the income tax basis of those qualifying assets by half of the related investment tax credit. Historically, the difference between the income tax basis of the assets and the book basis under GAAP was recorded as a deferred tax liability with an offsetting charge to income tax expense in the year the qualifying asset was placed in service. In June 2013, we recorded a regulatory asset and corresponding reduction of income tax expense of $11 million to recover previously recorded income tax expense through future rates as a result of the 2013 Rate Order. The regulatory asset will be amortized as income tax expense as the qualifying assets are depreciated.
Income tax expense included in the income statements consists of the following:
 Year Ended December 31,
(in millions)2015 2014 2013
Current Tax Expense (Benefit)     
Federal$
 $(1) $(8)
State
 
 (2)
Total Current Tax Expense (Benefit)
 (1) (10)
Deferred Tax Expense (Benefit)     
Federal66
 54
 47
Federal Investment Tax Credits(6) (4) (1)
State12
 9
 12
Total Deferred Tax Expense (Benefit)72
 59
 58
Total Federal and State Income Tax Expense$72
 $58
 $48
The significant components of deferred income tax assets and liabilities consist of the following:
 December 31,
(in millions)2015 2014
Gross Deferred Income Tax Assets   
Capital Lease Obligations$27
 $96
Net Operating Loss Carryforwards156
 187
Customer Advances and Contributions in Aid of Construction20
 19
Alternative Minimum Tax Credit24
 24
Accrued Postretirement Benefits23
 23
Emission Allowance Inventory9
 10
Investment Tax Credit Carryforward32
 31
Other53
 54
Total Gross Deferred Income Tax Assets344
 444
Deferred Tax Assets Valuation Allowance(4) (2)
Gross Deferred Income Tax Liabilities   
Plant, Net(750) (699)
Capital Lease Assets, Net(12) (74)
Pensions(27) (27)
PPFAC
 (8)
Other(19) (24)
Total Gross Deferred Income Tax Liabilities(808) (832)
Net Deferred Income Tax Liabilities$(468) $(390)

86


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



TEP has recorded a $4 million valuation allowance against credit and loss carryforward deferred tax assets at December 31, 2015 and a $2 million valuation allowance against credit carryforward deferred tax assets at December 31, 2014. Management believes TEP will not produce sufficient taxable income to use all credit and loss carryforwards before they expire.
As of December 31, 2015, TEP had the following carryforward amounts:
(in millions)Amount Expiring Year
Federal Net Operating Loss$430
 2031-34
State Net Operating Loss114
 2016-34
State Credits10
 2016-30
Alternative Minimum Tax Credit24
 None
Investment Tax Credits32
 2032-35
OBLIGATIONS AND FUNDED STATUS
We measured the actuarial present values of all pension benefit obligations and other retiree benefit plans at December 31, 20132015 and December 31, 2012.2014. The table below includes all of TEP’s UNS Electric’s, and UNS Gas’ plans. All plans have projected benefit obligations in excess of the fair value of plan assets for each period presented. The status of our pension benefit and other retiree benefit plans are summarized below:
Pension Benefits 
Other  Retiree
Benefits
Pension Benefits Other Retiree Benefits
Years Ended December 31,Year Ended December 31,
2013 2012 2013 2012
Millions of Dollars
(in millions)2015 2014 2015 2014
Change in Projected Benefit Obligation              
Benefit Obligation at Beginning of Year$380
 $319
 $78
 $73
$407
 $330
 $81
 $74
Actuarial (Gain) Loss(38) 51
 (5) 3
(22) 67
 (5) 5
Interest Cost15
 15
 3
 3
17
 16
 3
 3
Service Cost13
 10
 3
 3
12
 10
 4
 4
Benefits Paid(18) (15) (4) (4)(20) (16) (5) (5)
Projected Benefit Obligation at End of Year352
 380
 75
 78
394
 407
 78
 81
Change in Plan Assets              
Fair Value of Plan Assets at Beginning of Year289
 245
 7
 5
335
 307
 12
 10
Actual Return on Plan Assets29
 36
 1
 1
(3) 35
 
 1
Benefits Paid(18) (15) (4) (4)(20) (16) (5) (5)
Employer Contributions (1)
23
 23
 6
 5
24
 9
 6
 6
Fair Value of Plan Assets at End of Year323
 289
 10
 7
336
 335
 13
 12
Funded Status at End of Year$(29) $(91) $(65) $(71)$(58) $(72) $(65) $(69)
(1) 
TEP made $22 million in pension contributions and $6 million in other retiree benefits contributions in 2013 and $20 million in pension contributions and $5 million of other retiree benefits contributions in 2012. In 2014, UNS Energy2016, TEP expects to contribute $10 million to the pension plans, including $9 million in contributions by TEP.plans.

The table above includes the following for UNS Electric and UNS Gas:
74
Pension benefit obligations of $21 million at December 31, 2013 and $23 million at December 31, 2012;


Plan assets of $16 million at December 31, 2013 and $14 million at December 31, 2012; andNOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    
A retiree benefit obligation of $1 million at December 31, 2013 and December 31, 2012.


The following table provides the components of UNS Energy’sTEP’s regulatory assets and accumulated other comprehensive loss that have not been recognized as components of net periodic benefit cost as of the dates presented:
Pension Benefits 
Other  Retiree
Benefits
Pension Benefits Other Retiree Benefits
Years Ended December 31,Year Ended December 31,
2013 2012 2013 2012
Millions of Dollars
(in millions)2015 2014 2015 2014
Net Loss$77
 $133
 $7
 $13
$117
 $118
 $6
 $11
Prior Service Cost (Benefit)
 1
 (3) (3)3
 4
 (1) (2)
The accumulated benefit obligation aggregated for all pension plans is $314$355 million and $365 million at December 31, 20132015 and $334 million at December 31, 2012.
2014, respectively.
Information for Pension Plans with Accumulated Benefit Obligations in excess of Pension Plan Assets:
 December 31,
 2013 2012
 Millions of Dollars
Accumulated Benefit Obligation at End of Year30
 334
Fair Value of Plan Assets at End of Year16
 289

K-119

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



At December 31, 2012, all four UNS Energy defined benefitour pension plans had accumulated benefit obligations in excess of plan assets. Due to 2013 contributions, returns on plan assets, and the favorable impact of the increase in the discount rate on the accumulated benefit obligations, only the SERP, which is unfunded, and the UES plan have accumulated benefit obligations in excess of plan assets at December 31, 2013.2014. As a result of increases in discount rates and employer contributions, two of our plans had accumulated benefit obligations in excess of plan assets at December 31, 2015. The following table includes information for pension plans with accumulated benefit obligations in excess of pension plan assets:
 December 31,
(in millions)2015 2014
Accumulated Benefit Obligation$188
 $365
Fair Value of Plan Assets169
 335
UNS Energy’s netNet periodic benefit plan cost, comprised primarily of TEP's cost includes the following components:
Pension Benefits Other Retiree BenefitsPension Benefits Other Retiree Benefits
Years Ended December 31,Year Ended December 31,
2013 2012 2011 2013 2012 2011
Millions of Dollars
(in millions)2015 2014 2013 2015 2014 2013
Service Cost$13
 $10
 $10
 $4
 $3
 $3
$12
 $10
 $11
 $4
 $4
 $3
Interest Cost15
 16
 15
 3
 3
 4
17
 16
 14
 3
 3
 3
Expected Return on Plan Assets(20) (17) (16) (1) 
 
(23) (21) (19) (1) (1) (1)
Prior Service Cost Amortization
 
 
 (1) 
 (1)
Actuarial Loss Amortization9
 7
 6
 1
 
 
7
 3
 8
 
 
 
Net Periodic Benefit Cost$17
 $16
 $15
 $6
 $6
 $6
$13
 $8
 $14
 $6
 $6
 $5
Approximately 21%20% of the net periodic benefit cost was capitalized as a cost of construction and the remainder was included in income.
We measured service and interest costs for pension and other postretirement benefits utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. At the end of 2015, we changed our approach to determine the service and interest cost components of pension and other postretirement benefit expense. We elected to measure service and interest costs by applying the specific spot rates along that yield curve to the plans' liability cash flows beginning in 2016. TEP believes the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans' liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations nor the funded status. We accounted for this change as a change in accounting estimate, and accordingly, have accounted for it on a prospective basis.
The changes in plan assets and benefit obligations recognized as regulatory assets or in AOCI are as follows:
 Pension Benefits
 2013 2012 2011
 
Regulatory
Asset
 AOCI 
Regulatory
Asset
 AOCI 
Regulatory
Asset
 AOCI
 Millions of Dollars
Current Year Actuarial (Gain) Loss$(46) $(1) $30
 $1
 $25
 $(2)
Amortization of Actuarial Gain (Loss)(8) 
 (7) 
 (5) 
Total Recognized (Gain) Loss$(54) $(1) $23
 $1
 $20
 $(2)
 Other Retiree Benefits
 2013 2012 2011
 
Regulatory
Asset
 
Regulatory
Asset
 
Regulatory
Asset
 Millions of Dollars
Prior Service Cost (Credit)$
 $
 $(2)
Current Year Actuarial (Gain) Loss(6) 2
 
Amortization of Actuarial (Gain) Loss(1) 
 
Amortization of Prior Service (Cost) Credit1
 
 1
Total Recognized (Gain) Loss$(6) $2
 $(1)
 Pension Benefits
 Regulatory Asset AOCI
(in millions)2015 2014 2013 2015 2014 2013
Current Year Actuarial (Gain) Loss$5
 $49
 $(42) $
 $3
 $(1)
Amortization of Actuarial Gain (Loss)(7) (3) (8) 
 
 
Total Recognized (Gain) Loss$(2) $46
 $(50) $
 $3
 $(1)

75



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



 Other Retiree Benefits
 Regulatory Asset
(in millions)2015 2014 2013
Current Year Actuarial (Gain) Loss$(4) $5
 $(6)
For all pension plans, we amortize prior service costs on a straight-line basis over the average remaining service period of employees expected to receive benefits under the plan. We willexpect to amortize $4an estimated $7 million estimated net loss and less than $1 million prior service cost from otherpension regulatory assets and less thanan estimated $1 million in prior service costcredit from AOCI into net periodic benefit cost in 2014. The estimated prior service benefit for the other retiree benefit plan that will be amortized from other regulatory assets into net periodic benefit cost in 2014 is less than $1.0 million.2016.
The following table includes the weighted average assumptions used to determine benefit obligations:
 Pension Benefits 
Other Retiree
Benefits
 2013 2012 2013 2012
Weighted-Average Assumptions Used to Determine
Benefit Obligations as of December 31,
       
Discount Rate5.0% - 5.2% 4.1%-4.3% 4.7% 3.8%
Rate of Compensation Increase3.0% 3.0% N/A N/A

K-120

Table of Contents
 Pension Benefits Other Retiree Benefits
 2015 2014 2015 2014
Discount Rate4.5-4.6% 4.1-4.2% 4.2% 3.9%
Rate of Compensation Increase3.0% 3.0% N/A N/A
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



The following table includes the weighted average assumptions used to determine net periodic benefit costs:
Pension Benefits Other Retiree BenefitsPension Benefits Other Retiree Benefits
2013 2012 2011 2013 2012 20112015 2014 2013 2015 2014 2013
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended December 31, 
Discount Rate4.1%-4.3% 4.9% - 5.0% 5.5% - 5.6% 3.8% 4.7% 5.2%4.1%-4.2% 5.0%-5.1% 4.1%-4.1% 3.9% 4.7% 3.8%
Rate of Compensation Increase3.0% 3.0% 3.0% - 5.0% N/A N/A N/A3.0% 3.0% 3.0% N/A N/A N/A
Expected Return on Plan Assets7.0% 7.0% 7.0% 7.0% 7.0% 5.1%7.0% 7.0% 7.0% 7.0% 7.0% 7.0%
Net periodic benefit cost is subject to various assumptions and determinations, such as the discount rate, the rate of compensation increase, and the expected return on plan assets.
We use a combination of sources in selecting the expected long-term rate-of-return-on-assets assumption, including an investment return model. The model used provides a “best-estimate” range over 20 years from the 25th percentile to the 75th percentile. The model, used as a guideline for selecting the overall rate-of-return-on-assets assumption, is based on forward looking return expectations only. The above method is used for all asset classes.
Changes that may arise over time with regard to these assumptions and determinations will change amounts recorded in the future as net periodic benefit cost. The following table includes the assumed health care cost trend rates follow:rates:
 December 31,
 2013 2012
Health Care Cost Trend Rate Assumed for Next Year6.7% 6.9%
Ultimate Health Care Cost Trend Rate Assumed4.5% 4.5%
Year that the Rate Reaches the Ultimate Trend Rate2027 2027
 December 31,
 2015 2014
Next Year7.6% 6.7%
Ultimate Rate Assumed4.5% 4.5%
Year Ultimate Rate is Reached2036 2027
Assumed health care cost trend rates significantly affect the amounts reported for health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects on the December 31, 2013,2015 amounts:
One-Percentage-
Point Increase
 
One-Percentage-
Point Decrease
Millions of Dollars
(in millions)
One-Percentage-
Point Increase
 
One-Percentage-
Point Decrease
Effect on Total Service and Interest Cost Components$1
 $(1)$1
 $1
Effect on Retiree Benefit Obligation6
 (5)6
 5

76



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



PENSION PLAN AND OTHER RETIREE BENEFIT ASSETS
Pension Assets
We calculate the fair value of plan assets on December 31, the measurement date. Pension plan asset allocations, by asset category, on the measurement date were as follows:
TEP Plan Assets 
UNS Electric and UNS Gas Plan
Assets
2013 2012 2013 20122015 2014
Asset Category  
Equity Securities50% 50% 50% 56%49% 48%
Fixed Income Securities40
 41% 40
 33
41% 43%
Real Estate7
 7% 10
 11
8% 7%
Other3
 2% 
 
2% 2%
Total100% 100% 100% 100%100% 100%

K-121

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



The following tables settable sets forth the fair value measurements of pension plan assets by level within the fair value hierarchy:
Fair Value Measurements of Pension Assets
December 31, 2013
Quoted Prices in
Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 Total
Quoted Prices
in Active
Markets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 Total
Millions of Dollars
(in millions)December 31, 2015
Asset Category              
Cash Equivalents$1
 $
 $
 $1
$1
 $
 $
 $1
Equity Securities:              
United States Large Cap
 80
 
 80

 81
 
 81
United States Small Cap
 17
 
 17

 17
 
 17
Non-United States
 65
 
 65

 67
 
 67
Fixed Income
 130
 
 130

 137
 
 137
Real Estate
 9
 14
 23

 8
 18
 26
Private Equity
 
 7
 7

 
 7
 7
Total$1
 $301
 $21
 $323
$1
 $310
 $25
 $336
Fair Value Measurements of Pension Assets
December 31, 2012
       
Level 1 Level 2 Level 3 Total
Millions of Dollars
(in millions)December 31, 2014
Asset Category              
Cash Equivalents$1
 $
 $
 $1
$1
 $
 $
 $1
Equity Securities:             

United States Large Cap
 71
 
 71

 82
 
 82
United States Small Cap
 15
 
 15

 17
 
 17
Non-United States
 59
 
 59

 61
 
 61
Fixed Income
 116
 
 116

 143
 
 143
Real Estate
 8
 13
 21

 8
 16
 24
Private Equity
 
 6
 6

 
 7
 7
Total$1
 $269
 $19
 $289
$1
 $311
 $23
 $335
Level 1 cash equivalents are based on observable market prices and are comprised of the fair value of commercial paper, money market funds, and certificates of deposit.
Level 2 investments comprise amounts held in commingled equity funds, United States bond funds, and real estate funds. Valuations are based on active market quoted prices for assets held by each respective fund.
Level 3 real estate investments were valued using a real estate index value. The real estate index value was developed based on appraisals comprising 85%100% of real estate assets tracked by the index in 2013 and comprising 87% in 2012.index.
Level 3 private equity funds are classified as funds-of-funds. They are valued based on individual fund manager valuation models.

The tables above reflecting the fair value measurements of pension plan assets include Level 2 assets for the UNS Electric and UNS Gas pension plan of $16 million at December 31, 2013 and $14 million at December 31, 2012.
77



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



The following tables settable sets forth a reconciliation of changes in the fair value of pension assets classified as Level 3 in the fair value hierarchy. There were no transfers in or out of Level 3.

K-122

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



 
Year Ended
December 31, 2013
 
Private
Equity
 Real Estate Total
 Millions of Dollars
Beginning Balance at January 1, 2013$6
 $13
 $19
Actual Return on Plan Assets:     
Assets Held at Reporting Date1
 1
 2
Purchases, Sales, and Settlements
 
 
Ending Balance at December 31, 2013$7
 $14
 $21
 
Year Ended
December 31, 2012
 
Private
Equity
 Real Estate Total
 Millions of Dollars
Beginning Balance at January 1, 2012$4
 $11
 $15
Actual Return on Plan Assets:     
Assets Held at Reporting Date1
 2
 3
Purchases, Sales, and Settlements1
 
 1
Ending Balance at December 31, 2012$6
 $13
 $19
UNS Electric and UNS Gas have no pension assets classified as Level 3 in the fair value hierarchy.
(in millions)Private Equity Real Estate Total
Beginning Balance at January 1, 2014$7
 $14
 $21
Actual Return on Plan Assets:    

Assets Held at Reporting Date1
 2
 3
Purchases, Sales, and Settlements(1) 
 (1)
Ending Balance at December 31, 20147
 16
 23
Actual Return on Plan Assets:     
Assets Held at Reporting Date1
 2
 3
Purchases, Sales, and Settlements(1) 
 (1)
Ending Balance at December 31, 2015$7
 $18
 $25
Pension Plan Investments
Investment Goals
Asset allocation is the principal method for achieving each pension plan’s investment objectives while maintaining appropriate levels of risk. We consider the projected impact on benefit security of any proposed changes to the current asset allocation policy. The expected long-term returns and implications for pension plan sponsor funding are reviewed in selecting policies to ensure that current asset pools are projected to be adequate to meet the expected liabilities of the pension plans. We expect to use asset allocation policies weighted most heavily to equity and fixed income funds, while maintaining some exposure to real estate and opportunistic funds. Within the fixed income allocation, long-duration funds may be used to partially hedge interest rate risk.
Risk Management
We recognize the difficulty of achieving investment objectives in light of the uncertainties and complexities of the investment markets. We also recognize some risk must be assumed to achieve a pension plan’s long-term investment objectives. In establishing risk tolerances, the following factors affecting risk tolerance and risk objectives will be considered: plan status, plan sponsor financial status and profitability, plan features, and workforce characteristics. We have determined that the pension plans can tolerate some interim fluctuations in market value and rates of return in order to achieve long-term objectives. TEP tracks each pension plan’s portfolio relative to the benchmark through quarterly investment reviews. The reviews consist of a performance and risk assessment of all investment categories and on the portfolio as a whole. Investment managers for the pension plan may use derivative financial instruments for risk management purposes or as part of their investment strategy. Currency hedges may also be used for defensive purposes.
Relationship between Plan Assets and Benefit Obligations
The overall health of each plan will be monitored by comparing the value of plan obligations (both Accumulated Benefit Obligation and Projected Benefit Obligation) against the fair value of assets and tracking the changes in each. The frequency of this monitoring will depend on the availability of plan data, but will be no less frequent than annually via actuarial valuation.

K-12378


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Target Allocation Percentages
The current target allocation percentages for the major asset categories of the plan as of December 31, 20132015 follow. Each plan allows a variance of +/- 2% from these targets before funds are automatically rebalanced.
TEP Plan UNS Electric and UNS Gas Plan VEBA TrustTEP Plans VEBA Trust
Cash/Treasury Bills—% 2%
Equity Securities: 
United States Large Cap24% 39%
United States Small Cap5% 5%
Non-United States Developed15% 7%
Non-United States Emerging5% 9%
Fixed Income41% 42% 38%42% 38%
United States Large Cap24% 24% 39%
Non-United States Developed15% 14% 7%
Real Estate8% 10% —%8% —%
United States Small Cap5% 5% 5%
Non-United States Emerging5% 5% 9%
Private Equity2% —% —%1% —%
Cash/Treasury Bills—% —% 2%
Total100% 100% 100%100% 100%
Pension Fund Descriptions
For each type of asset category selected by the Pension Committee, our investment consultant assembles a group of third-party fund managers and allocates a portion of the total investment to each fund manager. In the case of the private equity fund, our investment consultant directs investments to a private equity manager that invests in third-parties’ funds.
Other Retiree Benefit Assets
As of December 31, 2013,2015, the fair value of VEBA trust assets was $10$13 million, of which $5 million were fixed income investments and $8 million were equities. As of December 31, 2014, the fair value of VEBA trust assets was $12 million, of which $4 million were fixed income investments and $6 million were equities. As of December 31, 2012, the fair value of VEBA trust assets was $7 million, of which $3 million were fixed income investments and $4$8 million were equities. The VEBA trust assets are primarily Level 2. There are no Level 3 assets in the VEBA trust.
ESTIMATED FUTURE BENEFIT PAYMENTS
TEP expects the following benefit payments to be made by the defined benefit pension plans and other retiree benefit plan, which reflect future service, as appropriate.
 2014
 2015
 2016
 2017
 2018
 2019-2023
 Millions of Dollars
Pension Benefits$15
 $16
 $17
 $18
 $20
 $114
Other Retiree Benefits5
 5
 5
 5
 5
 29
One of TEP’s noncontributory defined benefit pension plans was amended in 2012 to allow terminated participants to elect early retirement benefits equal to the actuarial equivalent of the participant’s termination retirement benefit. The impact of the amendment on estimated future benefit payments was approximately $5 million in total, and the effect on the pension benefit obligation was less than $1 million.
UNS Electric and UNS Gas expect annual benefit payments, made by the defined benefit pension and retiree plans, to be approximately $7 million in 2014 through 2018, and $9 million in 2019 through 2023.
(in millions)2016 2017 2018 2019 2020 2021-2025
Pension Benefits$17
 $18
 $19
 $21
 $22
 $125
Other Retiree Benefits5
 5
 5
 6
 6
 33
DEFINED CONTRIBUTION PLAN
We offer a defined contribution savings plan to all eligible employees. The Internal Revenue Code identifies the plan as a qualified 401(k) plan. Participants direct the investment of contributions to certain funds in their account which may include a UNS Energy stock fund.account. We match part of a participant’s contributions to the plan. TEP made matching contributions to the plan of $5 million in each of 2013, 2012,2015, 2014, and 2011. UNS Electric and UNS Gas made matching contributions of less than $1 million in each of 2013, 2012, and 2011.2013.


K-124

NOTE 9. SHARE-BASED COMPENSATION
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



NOTE 11. SHARE-BASED COMPENSATION PLANS
UnderUNS Energy in 2014 resulted in accelerated vesting and expense recognition of all outstanding non-vested UNS Energy share-based awards issued under the UNS Energy 2011 Omnibus Stock and Incentive Plan (2011 Plan),. The outstanding non-vested awards would otherwise have been recognized over remaining vesting periods through February 2017. TEP recognized approximately $2 million of expense in 2014 due to the Compensation Committeeaccelerated vesting of the awards. TEP recorded total share-based compensation expense of $5 million for the year ended December 31, 2014 and $3 million for the year ended December 31, 2013. In August 2014, UNS Energy settled all outstanding share-based compensation awards related to the 2011 Plan in cash.

79



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



2015 SHARE UNIT PLAN
The Human Resources and Governance Committee (Committee) of UNS Energy, approved and UNS Energy's Board of Directors (Compensation Committee) may issue various typesratified the 2015 Share Unit Plan (Plan) effective as of share-based compensation,January 1, 2015. Under the Plan, key employees, including stock options, restricted stock units,executive officers of UNS Energy and performance shares. The total number of shares whichits subsidiaries, may be awarded undergranted long-term incentive awards of performance-based share units (PSUs) and time-based restricted share units (RSUs) annually. Each PSU and RSU granted will be valued based on one share of Fortis common stock converted to U.S. dollars. Fortis common stock is traded on the 2011 Plan cannot exceed 1.2 million shares.
STOCK OPTIONS
Toronto Stock options are granted with an exercise price equal to the fair market valueExchange. TEP’s share of the stockobligation and expense as a subsidiary of UNS Energy is allocated based on the date of grant, vest over three years, become exercisableMassachusetts Formula.
UNS Energy awarded 47,776 PSUs and 23,888 RSUs in one-third increments2015 that are payable on eachthe third anniversary date of the grant and expiredate. The awards are classified as liability awards based on the tenth anniversarycash settlement feature. Liability awards are measured at their fair value at the end of each reporting period and will fluctuate based on the price of Fortis common stock as well as the level of achievement of the grant. We recognizefinancial performance criteria. At December 31, 2015, TEP's allocated share of probable payout is $2 million.
TEP's allocated portion of the compensation expense is recognized in Operations and Maintenance on the Consolidated Statements of Income. Compensation expense associated with unvested PSUs and RSUs is recognized on a straight-line basis over the minimum required service period for the total award based on the grant date fair value of the options less estimated forfeitures. For awards granted to retirement-eligible officers, we recognize compensation expense immediately. No stock options were granted by the Compensation Committee in 2013, 2012, or 2011.
See summary of stock option activity in the table below:
  2013 2012 2011
Stock Options 
Shares
(000s)
 
Weighted
Average
Exercise
Price
 
Shares
(000s)
 
Weighted
Average
Exercise
Price
 
Shares
(000s)
 
Weighted
Average
Exercise
Price
Outstanding, Beginning of Year 409
 $29.09
 581
 $29.11
 921
 $27.96
Exercised (127) 30.12
 (132) 26.54
 (319) 25.60
Forfeited/Expired 
 
 (40) 37.88
 (21) 31.92
Outstanding, End of Year 282
 28.63
 409
 29.09
 581
 29.11
Exercisable, End of Year 282
 $28.63
 409
 $29.09
 508
 $29.53
Aggregate Intrinsic Value of Options Exercised ($000s)   $2,897
   $1,878
   $3,690
See summary of stock options in the tables below:
 December 31, 2013
Aggregate Intrinsic Value for Options Outstanding ($000s)$8,795
Aggregate Intrinsic Value for Options Exercisable ($000s)$8,795
Weighted Average Remaining Contractual Term of Outstanding Options4.1 years
Weighted Average Remaining Contractual Term of Exercisable Options4.1 years
  Options Outstanding Options Exercisable
Range of Exercise Prices 
Number  of
Shares
(000s)
 
Weighted
Average
Remaining
Contractual
Term
 
Weighted
Average
Exercise
Price
 
Number  of
Shares
(000s)
 
Weighted
Average
Exercise Price
$26.11—$37.88 282
 4.1 years $28.63
 282
 $28.63
RESTRICTED STOCK UNITS AND PERFORMANCE SHARES
Restricted Stock Units
In 2013, 2012, and 2011, the Compensation Committee granted restricted stock units to non-employee directors. We recognize compensation expense equal to the fair valuin the tablee on the grant date over the one-year vesting period. The grant date fair value was calculated by reducing the grant date share price by the present value of the dividends expected to be paid on the shares during the vesting period. Fully vested but undistributed non-employee director stock unit awards accrue dividend equivalent stock units based on the fair market value of common shares on the date the dividend is paid. We issue Common Stock for the vested stock units in the January following the year the person is no longer a director.
In 2013, the Compensation Committee granted restricted stock units to certain management employees. The restricted stock units vest on the third anniversary of grant and are distributed in shares of Common Stock upon vesting. We recognize compensation expensean amount equal to the fair value on the grantmeasurement date overor each reporting period. TEP recorded $1 million for the vesting period. The grant date fair value was the closing Common Stock market price on the date of grant. These restricted stock units accrue dividend equivalents during the vesting period, which are distributed in shares of Common Stock upon vesting.

K-125

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



See summary of restricted stock units awarded in the table below:
  Non-Employee Directors Management Employees
Award Year Restricted Stock Units Grant Date Fair Value Restricted Stock Units Grant Date Fair Value
2013 8,870
 $48.99
 21,560
 $46.23
2012 15,303
 35.94
 
 
2011 14,655
 37.53
 
 
Performance Shares
In 2013, 2012, and 2011, the Compensation Committee granted performance share awards to certain management employees. Half of the performance share awards will be paid out in Common Stockyear ended December 31, 2015 based on UNS Energy’s compound annualized Total Shareholder Return (TSR) relative to the companies included in the Edison Electric Institute Utility Index for the three-year performance period. The grant date fair values of these awards were derived based on a Monte Carlo simulation. We recognize compensation expense equal to the fair value on the grant date over the vesting period if the requisite service period is fulfilled, whether or not the threshold is achieved. The remaining half will be paid out in Common Stock based on cumulative net income (CNI) for the three-year performance period. The grant date fair values of these awards were the closing Common Stock market prices on the dates of grant. We recognize compensation expense equal to the fair value on the grant date over the requisite service period only for the awards that ultimately vest.
The performance shares vest based on the achievement of these goals by the end of the three-year performance period; any unearned awards are forfeited. Performance shares accrue dividend equivalents during the performance period, which are paid upon vesting.
See summary of performance shares awarded in the table below:
    Grant Date Fair Value
Award Year Performance Shares TSR-Based Award CNI-Based Award
2013 43,120
 $45.54
 $46.23
2012 80,140
 32.71
 36.40
2011 80,440
 33.73
 36.58
At December 31, 2013, upon completion of the three-year performance period, 68,158 shares were earned and vested based on goal attainment at 150% of target for the awards based on TSR and 57.8% of target for the awards based on CNI; 28,682 shares were unearned and forfeited. The vested performance shares also earned 8,521 in dividend equivalent shares.
See summary of restricted stock units and performance shares current year activity in the table below:
  Restricted Stock Units Performance Shares
  
Shares
(000s)
 
Weighted
Average
Grant  Date
Fair Value
 
Shares
(000s)
 
Weighted
Average
Grant  Date
Fair Value
Non-vested, Beginning of Year 15
 $35.94
 145
 $34.83
Granted 31
 47.04
 52
 44.94
Vested (16) 36.27
 (52) 35.35
Forfeited (2) 46.23
 (32) 37.57
Non-vested, End of Year 28
 47.12
 113
 38.45
The total fair value of restricted stock units and performance shares vested were as follows:
 Restricted Stock Units Performance Shares
 2013 2012 2011 2013 2012 2011
 Thousands of Dollars
Total Fair Value of Shares Vested$574
 $550
 $495
 $2,387
 $2,377
 $1,069
Common Stock shares totaling 57,253 in 2013, 31,058 in 2012, and 56,705 in 2011 were issued with no additional increase in equity as the expense was previously recognized over the vesting period.

K-126

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



SHARE-BASED COMPENSATION EXPENSE
In 2013, UNS Energy and TEP recorded share-based compensation expense of $3 million. In 2012 and 2011, UNS Energy recorded share-based compensation expense of $3 million, $2 million of which related to TEP. No share-based compensation was capitalized as part of the cost of an asset. UNS Energy did not realize a tax deduction from the exercise of share-based payment arrangements in 2013 or 2011. In 2012, the actual tax deduction realized from the exercise of share-based payment arrangements totaled less than $0.5 million.
At December 31, 2013, the total unrecognized compensation cost related to non-vested share-based compensation was $3 million, which will be recorded as compensation expense over the remaining vesting periods through February 2016. At December 31, 2013, less than 0.5 million shares were awarded but not yet issued, including target performance shares, under the share-based compensation plans.
NOTE 12. UNS ENERGY EARNINGS PER SHARE
We compute basic Earnings Per Share (EPS) by dividing Net Income by the weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could result if outstanding stock options, share-based compensation awards, or UNS Energy's Convertible Senior Notes were exercised or converted into Common Stock. We excluded anti-dilutive stock options and contingently issuable shares from the calculation of diluted EPS. The numerator in calculating diluted EPS is Net Income adjusted for the interest on Convertible Senior Notes (net of tax) that would not be paid if the notes were converted to Common Stock.
The following table illustrates the effect of dilutive securities on net income and weighted average Common Stock outstanding:
 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
Numerator:     
Net Income$127,478
 $90,919
 $109,975
Income from Assumed Conversion of Convertible Senior Notes (1)

 1,100
 4,390
Adjusted Net Income Available for Diluted Common Stock Outstanding$127,478
 $92,019
 $114,365
      
 Thousands of Shares
Denominator: 
Weighted Average Shares of Common Stock Outstanding:     
Common Shares Issued41,446
 40,212
 36,780
Fully Vested Deferred Stock Units172
 150
 129
Participating Securities
 
 53
Total Weighted Average Common Stock Outstanding and Participating Securities—Basic41,618
 40,362
 36,962
Effect of Dilutive Securities:     
Convertible Senior Notes (1)

 1,062
 4,281
Options and Stock Issuable Under Share-Based Compensation Plans357
 331
 366
Total Weighted Average Common Stock Outstanding —Diluted41,975
 41,755
 41,609
(1)
In 2012, the Convertible Senior Notes were converted to Common Stock or redeemed for cash.

K-127

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



We excluded the following outstanding stock options, with an exercise price above market, and contingently issuable shares from our diluted EPS computation as their effect would be anti-dilutive:
 Years Ended December 31,
 2013 2012 2011
 Thousands of Shares
Stock Options
 50
 153
Restricted Stock Units6
 
 
Total Anti-Dilutive Shares Excluded from the Diluted EPS Computation6
 50
 153
NOTE 13. STOCKHOLDERS’ EQUITY
DIVIDEND LIMITATIONS
UNS Energy
UNS Energy’s ability to pay cash dividends on Common Stock outstanding depends, in part, upon cash flows from our subsidiaries: TEP, UES, Millennium, and UED, as well as compliance with various debt covenant requirements. UNS Energy and each of its subsidiaries were in compliance with debt covenants at December 31, 2013; therefore, TEP and the other subsidiaries were not restricted from paying dividends.
The merger agreement with Fortis allows UNS Energy's Board of Directors to authorize quarterly dividends of up to $0.48 per share until the merger is completed, including a pro rata dividend determined by the number of days from the last declared record date to the date the merger is completed.
In February 2014, UNS Energy declared a first quarter dividend to shareholders of $0.48 per share of UNS Energy Common Stock. The dividend, totaling approximately $20 million, will be paid on March 25, 2014, to common shareholders of record as of March 13, 2014.
In the first half of 2012, $147 million of the Convertible Senior Notes outstanding were converted into approximately 4.3 million shares of UNS Energy Common Stock increasing common stock equity by $147 million.
TEP
TEP paid dividends to UNS Energy of $40 million in 2013 and $30 million in 2012. TEP paid no dividends to UNS Energy in 2011.
UNS Energy made no capital contributions to TEP in 2013 or 2012, and made capital contributions to TEP of $30 million in 2011.Energy's compensation expense.


K-128

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



NOTE 14.10. SUPPLEMENTAL CASH FLOW INFORMATION
A reconciliation of Net Income to Net Cash Flows from Operating Activities follows:CASH TRANSACTIONS
 UNS Energy
 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
Net Income$127,478
 $90,919
 $109,975
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities     
Depreciation Expense149,615
 141,303
 133,832
Amortization Expense27,557
 35,784
 30,983
Depreciation and Amortization Recorded to Fuel and O&M Expense7,288
 6,622
 6,140
Amortization of Deferred Debt-Related Costs included in Interest Expense3,050
 3,000
 3,985
Provision for Retail Customer Bad Debts2,263
 2,767
 2,072
Use of Renewable Energy Credits for Compliance17,706
 5,935
 5,695
Deferred Income Taxes83,501
 60,264
 75,515
Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset(11,039) 
 
Pension and Retiree Expense22,783
 21,856
 21,202
Pension and Retiree Funding(29,161) (29,058) (28,775)
Share-Based Compensation Expense3,399
 2,573
 2,599
Allowance for Equity Funds Used During Construction(6,190) (3,464) (4,496)
Increase (Decrease) to Reflect PPFAC/PGA Recovery(16,313) 32,246
 (4,932)
PPFAC Reduction - 2013 TEP Rate Order3,000
 
 
Competition Transition Charge Revenue Refunded
 
 (35,958)
Partial Write-off of Tucson to Nogales Transmission Line
 4,668
 
Liquidated Damages for Springerville Unit 3 Outage
 2,050
 
Gain on Settlement of El Paso Electric Dispute
 
 (7,391)
Changes in Assets and Liabilities which Provided (Used)     
Cash Exclusive of Changes Shown Separately     
Accounts Receivable(6,338) 3,369
 2,743
Materials and Fuel Inventory16,197
 (39,429) (20,864)
Accounts Payable3,223
 595
 8,792
Income Taxes(15,868) (11,557) (2,739)
Interest Accrued4,875
 6,922
 14,344
Taxes Other Than Income Taxes1,941
 (58) 2,857
Current Regulatory Liabilities11,124
 (684) 2,644
Other20,421
 11,486
 19,097
Net Cash Flows – Operating Activities$420,512
 $348,109
 $337,320


K-129

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



 TEP
 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
Net Income$101,342
 $65,470
 $85,334
Adjustments to Reconcile Net Income     
To Net Cash Flows from Operating Activities     
Depreciation Expense118,076
 110,931
 104,894
Amortization Expense31,294
 39,493
 34,650
Depreciation and Amortization Recorded to Fuel and O&M Expense6,219
 5,384
 4,509
Amortization of Deferred Debt-Related Costs Included in Interest Expense2,452
 2,227
 2,378
Provision for Retail Customer Bad Debts1,678
 1,871
 1,447
Use of RECs for Compliance15,990
 5,071
 5,190
Deferred Income Taxes69,950
 45,232
 59,309
Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset(10,751) 
 
Pension and Retiree Expense19,878
 19,289
 18,816
Pension and Retiree Funding(27,636) (25,899) (25,878)
Share-Based Compensation Expense2,709
 2,029
 2,027
Allowance for Equity Funds Used During Construction(4,526) (2,840) (3,842)
Increase (Decrease) to Reflect PPFAC Recovery(12,458) 31,113
 (6,165)
PPFAC Reduction - 2013 TEP Rate Order3,000
 
 
Competition Transition Charge Revenue Refunded
 
 (35,958)
Partial Write-off of Tucson to Nogales Transmission Line
 4,484
 
       Liquidated Damages for Springerville Unit 3 Outage
 2,050
 
Gain on Settlement of El Paso Electric Dispute
 
 (7,391)
Changes in Assets and Liabilities which Provided (Used)     
Cash Exclusive of Changes Shown Separately     
Accounts Receivable(6,041) (871) 4,809
Materials and Fuel Inventory16,145
 (38,384) (19,789)
Accounts Payable334
 1,115
 14,561
Income Taxes(10,790) (11,421) (5,582)
Interest Accrued4,859
 8,055
 14,268
Taxes Other Than Income Taxes1,425
 905
 2,282
Current Regulatory Liabilities3,331
 (3,040) 303
Other19,711
 5,655
 18,122
Net Cash Flows – Operating Activities$346,191
 $267,919
 $268,294
 Year Ended December 31,
(in millions)2015 2014 2013
Interest, Net of Amounts Capitalized$65
 $83
 $53
Income Taxes
 
 
NON-CASH TRANSACTIONS
In 2013, the following non-cash transactions occurred:
TEP recorded an increase of $55 million to both Utility Plant Under Capital Leases and Capital Lease Obligations due to TEP's commitment to purchase leased interests in December 2014 and January 2015. See Note 6.
In November 2013, TEP issued $100 million of tax-exempt bonds and the proceeds were deposited with the trustee to redeem debt in December 2013. TEP had no cash receipts or payments as a result of this transaction. See Note 6.
In March 2013, TEP issued $91 million of tax-exempt bonds and used the proceeds to redeem debt using a trustee. Since the cash flowed through a trust account, the issuance and redemption of debt resulted in a non-cash transaction. See Note 6.

K-130

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



In 2012, the following non-cash transactions occurred:
UNS Energy converted $147 million of the previously outstanding $150 million Convertible Senior Notes into Common Shares. See Note 6; and
TEP redeemed $193 million of tax-exempt bonds and reissued debt using a trustee. Since the cash flowed through trust accounts, the redemption and reissuance of debt resulted in a non-cash transaction at TEP. See Note 6.
Other significant non-cash investing and financing activities that affected recognized assets and liabilities but did not result in cash receipts or payments were as follows:
 Years Ended December 31,
 2013 2012 2011
 Thousands of Dollars
(Decrease)/Increase to Utility Plant Accruals(1)
$4,995
 $4,813
 $(2,741)
Net Cost of Removal of Interim Retirements(2)
25,182
 35,983
 31,626
Capital Lease Obligations(3)
9,039
 11,967
 15,162
Asset Retirement Obligations(4)
8,064
 789
 7,638
 Year Ended December 31,
(in millions)2015 2014 2013
Accrued Capital Expenditures$28
 $29
 $24
Net Cost of Removal of Interim Retirements (1)
1
 12
 25
Commitment to Purchase Capital Lease Interests
 109
 55
Capital Lease Obligations (2)

 1
 9
Proceeds from Issuance of Long-Term Debt Deposited in Trust
 
 191
Asset Retirement Obligations (3)
3
 4
 8
(1)
The non-cash additions to Utility Plant represent accruals for capital expenditures.
(2) 
The non-cash net cost of removal of interim retirements represents an accrual for future asset retirement obligations that does not impact earnings.
(3)(2) 
The non-cash change in capital lease obligations represents interest accrued for accounting purposes in excess of interest payments.
(4)(3) 
The non-cash additions to asset retirement obligations and related capitalized assets represent a revision of estimated asset retirement cost due to changes in timing and amount of the expected future asset retirement obligations.


NOTE 15.11. FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS
We categorize our assets and liabilities accounted for at fair valuefinancial instruments into the three-level hierarchy based on inputs used to determine the fair value. Level 1 inputs are unadjusted quoted prices for identical assets or liabilities in an active market. Level 2 inputs include quoted prices for similar assets or liabilities, quoted prices in non-active markets, and pricing models whose inputs are observable, directly or

80



NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



indirectly. Level 3 inputs are unobservable and supported by little or no market activity.

K-131

Table Transfers between levels are recorded at the end of Contentsa reporting period. There were no transfers between levels in the periods presented.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS
The following tables present, by level within the fair value hierarchy, UNS Energy’s and TEP’s assets and liabilities accounted for at fair value on a recurring basis. These assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
UNS EnergyLevel 1 Level 2 Level 3 Total
Total Level 1 Level 2 Level 3 
Counterparty Netting of Energy Contracts Not Offset on the Balance Sheets(5)
 Net Amount
December 31, 2013
Millions of Dollars
(in millions)December 31, 2015
Assets    
Cash Equivalents(1)
$14
 $14
 $
 $
 $
 $14
$33
 $
 $
 $33
Restricted Cash(1)
2
 2
 
 
 
 2
4
 
 
 4
Rabbi Trust Investments(2)
22
 
 22
 
 
 22
Energy Contracts - Regulatory Recovery(3)
7
 
 3
 4
 (5) 2
Energy Derivative Contracts - Regulatory Recovery(2)

 1
 
 1
Energy Derivative Contracts - No Regulatory Recovery(2)

 
 1
 1
Total Assets45
 16
 25
 4
 (5) 40
37
 1
 1
 39
Liabilities                  
Energy Contracts - Regulatory Recovery(3)
(7) 
 (2) (5) 5
 (2)
Energy Contracts - Cash Flow Hedge(3)
(1) 
 
 (1) 
 (1)
Interest Rate Swaps(4)
(7) 
 (7) 
 
 (7)
Energy Derivative Contracts - Regulatory Recovery(2)

 (10) (3) (13)
Interest Rate Swap(3)

 (3) 
 (3)
Total Liabilities(15) 
 (9) (6) 5
 (10)
 (13) (3) (16)
Net Total Assets (Liabilities)$30
 $16
 $16
 $(2) $
 $30
$37
 $(12) $(2) $23
 UNS Energy
 Total Level 1 Level 2 Level 3 
Counterparty Netting of Energy Contracts Not Offset on the Balance Sheets(5)
 Net Amount
 December 31, 2012
 Millions of Dollars
Assets   
Cash Equivalents(1)
$20
 $20
 $
 $
 $
 $20
Restricted Cash(1)
7
 7
 
 
 
 7
Rabbi Trust Investments(2)
19
 
 19
 
 
 19
Energy Contracts - Regulatory Recovery(3)
7
 
 2
 5
 (5) 2
Total Assets53
 27
 21
 5
 (5) 48
Liabilities           
Energy Contracts - Regulatory Recovery(3)
(15) 
 (7) (8) 5
 (10)
Energy Contracts - Cash Flow Hedge(3)
(2) 
 
 (2) 
 (2)
Interest Rate Swaps(4)
(10) 
 (10) 
 
 (10)
Total Liabilities(27) 
 (17) (10) 5
 (22)
Net Total Assets (Liabilities)$26
 $27
 $4
 $(5) $
 $26

K-132

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



 TEP
 Total Level 1 Level 2 Level 3 
Counterparty Netting of Energy Contracts Not Offset on the Balance Sheets(5)
 Net Amount
 December 31, 2013
 Millions of Dollars
Assets   
Cash Equivalents(1)
$
 $
 $
 $
 $
 $
Restricted Cash(1)
2
 2
 
 
 
 2
Rabbi Trust Investments(2)
22
 
 22
 
 
 22
Energy Contracts - Regulatory Recovery(3)
2
 
 1
 1
 (1) 1
Total Assets26
 2
 23
 1
 (1) 25
Liabilities           
Energy Contracts - Regulatory Recovery(3)
(2) 
 
 (2) 1
 (1)
Energy Contracts - Cash Flow Hedge(3)
(1) 
 
 (1) 
 (1)
Interest Rate Swaps(4)
(7) 
 (7) 
 
 (7)
Total Liabilities(10) 
 (7) (3) 1
 (9)
Net Total Assets (Liabilities)$16
 $2
 $16
 $(2) $
 $16
TEP
Total Level 1 Level 2 Level 3 
Counterparty Netting of Energy Contracts Not Offset on the Balance Sheets(5)
 Net Amount
December 31, 2012
Millions of Dollars
(in millions)December 31, 2014
Assets    
Cash Equivalents(1)
$1
 $1
 $
 $
 $
 $1
$15
 $
 $
 $15
Restricted Cash(1)
7
 7
 
 
 
 7
2
 
 
 2
Rabbi Trust Investments(2)
19
 
 19
 
 
 19
Energy Contracts - Regulatory Recovery(3)
3
 
 1
 2
 (1) 2
Energy Derivative Contracts - Regulatory Recovery(2)
��
 
 2
 2
Total Assets30
 8
 20
 2
 (1) 29
17
 
 2
 19
Liabilities                  
Energy Contracts - Regulatory Recovery(3)
(3) 
 (3) 
 1
 (2)
Energy Contracts - Cash Flow Hedge(3)
(2) 
 
 (2) 
 (2)
Interest Rate Swaps(4)
(10) 
 (10) 
 
 (10)
Energy Derivative Contracts - Regulatory Recovery(2)

 (9) (9) (18)
Energy Derivative Contracts - No Regulatory Recovery(2)

 
 (1) (1)
Energy Derivative Contracts - Cash Flow Hedge(2)

 
 (1) (1)
Interest Rate Swap(3)

 (5) 
 (5)
Total Liabilities(15) 
 (13) (2) 1
 (14)
 (14) (11) (25)
Net Total Assets (Liabilities)$15
 $8
 $7
 $
 $
 $15
$17
 $(14) $(9) $(6)
(1) 
Cash Equivalents and Restricted Cash represent amounts held in money market funds and certificates of deposit valued at cost, including interest.interest, which approximates fair market value. Cash Equivalents are included in Cash and Cash Equivalents on the balance sheets.Consolidated Balance Sheets. Restricted Cash is included in Investments and Other Property – Other on the balance sheets.Consolidated Balance Sheets.
(2)
Rabbi Trust Investments include amounts related to deferred compensation and Supplement Executive Retirement Plan (SERP) benefits held in mutual and money market funds valued at quoted prices traded in active markets. These investments are included in Investments and Other Property – Other on the balance sheets.
(3) 
Energy Contracts include gas swap agreements (Level 2), power options (Level 2 or Level 3)2), gas options (Level 3), forward power purchase and sales contracts (Level 3), and forward power purchase contracts indexed to gas (Level 3), entered into to reduce exposure to energy price risk.risk, and, at December 31, 2014 a power sale option (Level 3). These contracts are included in Derivative Instruments on the UNS Energy and TEP balance sheets.Consolidated Balance Sheets. The valuation techniques are described below.
(4)
(3)
The Interest Rate Swaps areSwap is valued using an income valuation approach based on the 3-month or 6-month LIBOR index or the Securities Industry and Financial Markets Association municipal swap index. These interest rate swaps areis included in Derivative Instruments on the balance sheets.
(5)
All energy contracts are subject to legally enforceable master netting arrangements to mitigate credit risk. We have presented the effect of offset by counterparty; however, we present derivatives on a gross basis on the balance sheets.Consolidated Balance Sheets.

K-13381

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



All energy derivative contracts are subject to legally enforceable master netting arrangements to mitigate credit risk. We present derivatives on a gross basis on the balance sheet. The tables below presents the potential offset of counterparty netting and cash collateral.
 Gross Amount Recognized on the Balance Sheets Gross Amount Not Offset on the Balance Sheets Net Amount
  Counterparty Netting of Energy Contracts Cash Collateral Received/Posted 
(in millions)December 31, 2015
Derivative Assets       
Energy Derivative Contracts$2
 $1
 $
 $1
Derivative Liabilities       
Energy Derivative Contracts(13) (1) 
 (12)
Interest Rate Swap(3) 
 
 (3)
(in millions)December 31, 2014
Derivative Assets       
Energy Derivative Contracts$2
 $2
 $
 $
Derivative Liabilities       
Energy Derivative Contracts(20) (2) 
 (18)
Interest Rate Swap(5) 
 
 (5)
DERIVATIVE INSTRUMENTS
We enter into various derivative and non-derivative contracts to reduce our exposure to energy price risk associated with our gas and purchased power requirements. The objectives for entering into such contracts include: creating price stability; meeting load and reserve requirements; and reducing exposure to price volatility that may result from delayed recovery under the PPFAC.
We primarily apply the market approach for recurring fair value measurements. When we have observable inputs for substantially the full term of the asset or liability or use quoted prices in an inactive market, we categorize the instrument in Level 2. We categorize derivatives in Level 3 when we use an aggregate pricing service or published prices that represent a consensus reporting of multiple brokers.
For both power and gas prices we obtain quotes from brokers, major market participants, exchanges, or industry publications and rely on our own price experience from active transactions in the market. We primarily use one set of quotations each for power and for gas and then validate those prices using other sources. We believe that the market information provided is reflective of market conditions as of the time and date indicated.
Published prices for energy derivative contracts may not be available due to the nature of contract delivery terms such as non-standard time blocks and non-standard delivery points. In these cases, we apply adjustments based on historical price curve relationships, transmission, and line losses.
We estimate the fair value of our gas options using a Black-Scholes-Merton option pricing model which includes inputs such as implied volatility, interest rates, and forward price curves. Beginning in the third quarter of 2013, the fair value
The December 31, 2014 valuation of our power options is based on contractually specifiedsale option premiums insteadwas a function of observable market variables, regional power and gas prices, as well as the Black-Scholes-Merton option pricing model becauseratio between the needed inputs are no longer available. Based ontwo, which represents the change, we transferred the power options out of Level 3 and in to Level 2 at the end of third quarter of 2013. The amount transferred was less than $0.5 million. We record transfers between levels in the fair value hierarchy at the end of the reporting period. There were no other transfers between levels in the periods presented.prevailing market heat rate.
We also consider the impact of counterparty credit risk using current and historical default and recovery rates, as well as our own credit risk using credit default swap data.
OurThe inputs and our assessments of the significance of a particular input to the fair value measurements require judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. We review the assumptions underlying our contractsprice curves monthly.
Cash Flow Hedges
TheWe can enter into interest rate swaps to mitigate the exposure to volatility in variable interest rates on debt. We have an interest rate swap agreements expire through agreement that expires January 2020. The2020. We also had a power purchase swap to hedge the cash flow risk associated with

82


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



a long-term power supply agreement expireswhich expired in September 2015.2015. The after-tax unrealized gains and losses on cash flow hedge activities and amounts reclassified to earnings are reported in the statementsstatement of other comprehensive income and Note 16.income. The loss expected to be reclassified to earnings within the next twelve months is estimated to be $1 million. The realized losses from our cash flow hedges are shown in the following table:$4 million.
Financial Impact
 Year Ended December 31,
(in millions)2015 2014 2013
Capital Lease Interest Expense$2
 $2
 $2
Long-Term Debt Interest Expense
 1
 1
Purchased Power1
 1
 1
As of December 31, 2015, the total notional amount of our interest rate swap was $29 million.
Energy Derivative Contracts - Regulatory Recovery
We record unrealized gains and losses on energy purchase contracts that are recoverable through the PPFAC or PGA on the balance sheetssheet as a regulatory asset or a regulatory liability rather than reporting the transaction in the income statementsstatement or in the statementsstatement of other comprehensive income, as shown in following tables:table:
 UNS Energy TEP
 Years Ended December 31,
 2013 2012 2011 2013 2012 2011
 Millions of Dollars
Increase (Decrease) to Regulatory Assets/Liabilities$(9) $(21) $2
 $
 $(6) $2
 Year Ended December 31,
(in millions)2015 2014 2013
Unrealized Net Gain (Loss) Recorded to Regulatory (Assets) Liabilities$6
 $(18) $
RealizedEnergy Derivative Contracts - No Regulatory Recovery
Forward contracts with long-term wholesale customers do not qualify for regulatory recovery. For these contracts that qualify as derivatives, we record unrealized gains and losses in the income statement, unless and until a normal purchase or normal sale election is made. In February 2015, TEP made a normal sale election for a three-year sales option contract entered into in December 2014. In June 2015, TEP entered into long-term power trading contracts that qualify as derivatives but do not qualify for regulatory recovery. The unrealized gains and losses on settledthe long-term power trading contracts are fully recoverablerecorded in the income statement, and 10% of any gains will be shared with ratepayers through the PPFAC, or PGA. as realized.
Derivative Volumes
At December 31, 2013, UNS Energy and TEP2015, we have energy contracts that will settle through the fourth quarter of 2016.
Derivative Volumes
2018. The volumes associated with our energy contracts were as follows:
UNS Energy TEPDecember 31,
December 31, 2013 December 31, 2012 December 31, 2013 December 31, 20122015 2014
Power Contracts GWh1,583
 2,228
 779
 820
1,752
 2,604
Gas Contracts GBtu33,371
 17,851
 9,615
 7,958
17,214
 19,932

K-13483

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



Level 3 Fair Value Measurements
The following table provides quantitative information regarding significant unobservable inputs in UNS Energy’sTEP’s Level 3 fair value measurements:
   Fair Value at       
   December 31, 2013   Range of
 Valuation Approach Assets Liabilities Unobservable Inputs Unobservable Input
   Millions of Dollars      
Forward Contracts(1)
Market approach $1
 $(4) Market price per MWh $26.54
-$51.75

           
Option Contracts(2)
Option model 3
 (2) Market Price per MMbtu $3.87
-$4.32

      Gas Volatility 25.05%-35.07%
Level 3 Energy Contracts  $4
 $(6)      
(1)
TEP comprises $1 million
 Valuation Fair Value of   Range of
 Approach Assets Liabilities Unobservable Inputs Unobservable Input
(in millions)December 31, 2015
Forward Power ContractsMarket approach $1
 $(2) Market price per MWh $19.20
 $31.35
            
Gas Option ContractsOption model 
 (1) Market price per MMbtu $2.17
 $2.69

      Gas volatility 31.0% 58.3%
Level 3 Energy Contracts  $1
 $(3)      
            
(in millions)December 31, 2014
Forward Power ContractsMarket approach $1
 $(6) Market price per MWh $22.35
 $39.05
            
Power Sale OptionMarket approach 1
 (1) Market price per MWh $27.75
 $44.94
       Market price per MMbtu $2.88
 $4.02
            
Gas Option ContractsOption model 
 (4) Market price per MMbtu $2.72
 $3.26
       Gas volatility 30.8% 53.3%
Level 3 Energy Contracts  $2
 $(11)      
Changes in one or more of the forward contract assets and $3 million of the forward contract liabilities.
(2)
TEP comprises less than $1 million of the option contract assets.
Our exposure to risk resulting from changes in the unobservable inputs identified above is mitigated as we reportcould have a significant impact on the fair value measurement depending on the magnitude of the change inand the direction of the change for each input. The impact of changes to fair value, of energy contract derivativesincluding changes from unobservable inputs, are subject to recovery or refund through the PPFAC mechanism and are reported on the balance sheet as a regulatory asset or a regulatory liability, recoverable through the PPFAC or PGA mechanisms, or as a component of other comprehensive income, rather than in the income statement.
The following tables presenttable presents a reconciliation of changes in the fair value of assets and liabilities classified as Level 3 in the fair value hierarchy:
 UNS Energy TEP
 Millions of Dollars
Balances at December 31, 2012$(5) $
Realized/Unrealized Gains/(Losses) Recorded to:   
Net Regulatory Assets/Liabilities – Derivative Instruments(1) (2)
Settlements4
 
Balances at December 31, 2013$(2) $(2)
    
Total Gains/(Losses) Attributable to the Change in Unrealized Gains/(Losses) Relating to Assets/Liabilities Still Held at the End of the Period$(1) $(1)
 UNS Energy TEP
 Millions of Dollars
Balances at December 31, 2011$(10) $
Realized/Unrealized Gains/(Losses) Recorded to:   
Net Regulatory Assets/Liabilities – Derivative Instruments(5) 1
Settlements10
 (1)
Balances at December 31, 2012$(5) $
    
Total Gains/(Losses) Attributable to the Change in Unrealized Gains/(Losses) Relating to Assets/Liabilities Still Held at the End of the Period$(1) $
 Year Ended December 31,
(in millions)2015 2014
Beginning of Period$(9) $(2)
Gains (Losses) Recorded to:(1)
   
Net Regulatory Assets/Liabilities – Derivative Instruments(4) (8)
Electric Wholesale Sales3
 
Settlements8
 1
End of Period$(2) $(9)
(1)
Includes gains (losses) attributable to the change in unrealized gains/(losses) relating to assets (liabilities) still held at the end of the period of $(1) million and $(8) million for the years ended December 31, 2015, and 2014, respectively.
CREDIT RISK
The use of contractual arrangements to manage the risks associated with changes in energy commodity prices creates credit risk exposure resulting from the possibility of non-performance by counterparties pursuant to the terms of their contractual obligations. We enter into contracts for the physical delivery of energy and gas which contain remedies in the event of non-performance by the supply counterparties. In addition, volatile energy prices can create significant credit exposure from energy market receivables and subsequent measurement at fair value.
We have contractual agreements for energy procurement and hedging activities that contain certain provisions requiring each company to post collateral under certain circumstances. These circumstances include: exposures in excess of unsecured credit limits provided to TEP, UNS Electric, or UNS Gas;

84


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



limits; credit rating downgrades; or a failure to meet certain financial ratios. In the

K-135

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



event that such credit events were to occur, we would have to provide certain credit enhancements in the form of cash or LOCs to fully collateralize our exposure to these counterparties.
We consider the effect of counterparty credit risk in determining the fair value of derivative instruments that are in a net asset position after incorporating collateral posted by counterparties and allocate the credit risk adjustment to individual contracts. We also consider the impact of our own credit risk after considering collateral posted on instruments that are in a net liability position and allocate the credit risk adjustment to all individual contracts.
Material adverse changes could trigger credit risk-related contingent features. At December 31, 2013,2015, the fair value of all derivative instruments in a net liability positionpositions under contracts with credit risk-related contingent features, including contracts under the normal purchase normal sale exception, was $21$20 million, for UNS Energy and $5 compared with $27 million for TEP. The additional collateral to be posted if credit-risk at December 31, 2014. At December 31, 2015, TEP had less than $1 million of LOCs as credit enhancements with its counterparties. If the credit risk-related contingent features were triggered on December 31, 2015, TEP would be $21have been required to post an additional $20 million of collateral of which $8 million relates to outstanding net payable balances for UNS Energy and $5 million for TEP.settled positions.
FINANCIAL INSTRUMENTS NOT CARRIED AT FAIR VALUE
The fair value of a financial instrument is the market price to sell an asset or transfer a liability at the measurement date. We use the following methods and assumptions for estimating the fair value of our financial instruments:
The carrying amounts of our current assets, current liabilities, including current maturities of long-term debt, and amounts outstandingBorrowings under ourrevolving credit agreementsfacilities approximate the fair values due to the short-term nature of these financial instruments. These items have been excluded from the table below.
For Investment in Lease Debt, we calculated the present value of remaining cash flows using current market rates for instruments with similar characteristics such as credit rating and time-to-maturity. We also incorporated the impact of counterparty credit risk using market credit default swap data. TEP's Investment in Lease Debt matured in January 2013.
��For Investment in Lease Equity, we estimate the price at which an investor would realize a target internal rate of return. Our estimates include: the mix oflong-term debt, and equity an investor would use to finance the purchase; the cost of debt; the required return on equity; and income tax rates. The estimate assumes a residual value based on an appraisal of Springerville Unit 1 conducted in 2011.
For Long-Term Debt, we use quoted market prices, when available, or calculate the present value of remaining cash flows at the balance sheet date. When calculating present value, we use current market rates for bonds with similar characteristics such as credit rating and time-to-maturity. We consider the principal amounts of variable rate debt outstanding to be reasonable estimates of the fair value. We also incorporate the impact of our own credit risk using a credit default swap rate.
The use of different estimation methods and/or market assumptions may yield different estimated fair value amounts. The carrying values recorded onfollowing table includes the balance sheetsface value and the estimated fair valuesvalue of our financial instruments includelong-term debt:
 
Fair Value
Hierarchy
 Face Value Fair Value
   December 31,
(in millions)  2015 2014 2015 2014
Liabilities         
Long-Term Debt, including Current MaturitiesLevel 2 $1,466
 $1,375
 $1,529
 $1,457

NOTE 12. INCOME TAXES
Income tax expense differs from the amount of income tax determined by applying the United States statutory federal income tax rate of 35% to pre-tax income due to the following:
   December 31, 2013 December 31, 2012
 
Fair Value
Hierarchy
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
   Millions of Dollars
Assets:         
TEP Investment in Lease DebtLevel 2 $
 $
 $9
 $9
TEP Investment in Lease EquityLevel 3 36
 25
 36
 23
Liabilities:         
Long-Term Debt         
UNS EnergyLevel 2 1,507
 1,521
 1,498
 1,583
TEPLevel 2 1,223
 1,214
 1,223
 1,271


 Year Ended December 31,
(in millions)2015 2014 2013
Federal Income Tax Expense at Statutory Rate$70
 $56
 $52
State Income Tax Expense, Net of Federal Deduction8
 7
 7
Federal/State Tax Credits(8) (5) (2)
Allowance for Equity Funds Used During Construction(1) (2) (1)
Deferred Tax Asset Valuation Allowance1
 
 2
Investment Tax Credit Basis Adjustment - Creation of Regulatory Asset
 
 (11)
Other2
 2
 1
Total Federal and State Income Tax Expense$72
 $58
 $48

K-13685

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)



NOTE 16. CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME BY COMPONENTInvestment Tax Credit Basis Adjustment - Creation of Regulatory Asset
Renewable energy assets are eligible for investment tax credits. We reduce the income tax basis of those qualifying assets by half of the related investment tax credit. Historically, the difference between the income tax basis of the assets and the book basis under GAAP was recorded as a deferred tax liability with an offsetting charge to income tax expense in the year the qualifying asset was placed in service. In June 2013, we recorded a regulatory asset and corresponding reduction of income tax expense of $11 million to recover previously recorded income tax expense through future rates as a result of the 2013 Rate Order. The regulatory asset will be amortized as income tax expense as the qualifying assets are depreciated.
Income tax expense included in the income statements consists of the following:
 Year Ended December 31,
(in millions)2015 2014 2013
Current Tax Expense (Benefit)     
Federal$
 $(1) $(8)
State
 
 (2)
Total Current Tax Expense (Benefit)
 (1) (10)
Deferred Tax Expense (Benefit)     
Federal66
 54
 47
Federal Investment Tax Credits(6) (4) (1)
State12
 9
 12
Total Deferred Tax Expense (Benefit)72
 59
 58
Total Federal and State Income Tax Expense$72
 $58
 $48
The realized changes in AOCI by component are assignificant components of deferred income tax assets and liabilities consist of the following:
 December 31,
(in millions)2015 2014
Gross Deferred Income Tax Assets   
Capital Lease Obligations$27
 $96
Net Operating Loss Carryforwards156
 187
Customer Advances and Contributions in Aid of Construction20
 19
Alternative Minimum Tax Credit24
 24
Accrued Postretirement Benefits23
 23
Emission Allowance Inventory9
 10
Investment Tax Credit Carryforward32
 31
Other53
 54
Total Gross Deferred Income Tax Assets344
 444
Deferred Tax Assets Valuation Allowance(4) (2)
Gross Deferred Income Tax Liabilities   
Plant, Net(750) (699)
Capital Lease Assets, Net(12) (74)
Pensions(27) (27)
PPFAC
 (8)
Other(19) (24)
Total Gross Deferred Income Tax Liabilities(808) (832)
Net Deferred Income Tax Liabilities$(468) $(390)

86


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)    



TEP has recorded a $4 million valuation allowance against credit and loss carryforward deferred tax assets at December 31, 2015 and a $2 million valuation allowance against credit carryforward deferred tax assets at December 31, 2014. Management believes TEP will not produce sufficient taxable income to use all credit and loss carryforwards before they expire.
As of December 31, 2015, TEP had the following carryforward amounts:
(in millions)Amount Expiring Year
Federal Net Operating Loss$430
 2031-34
State Net Operating Loss114
 2016-34
State Credits10
 2016-30
Alternative Minimum Tax Credit24
 None
Investment Tax Credits32
 2032-35
Uncertain Tax Positions
A reconciliation of the beginning and ending balances of unrecognized tax benefits follows:
Details About Accumulated Other Comprehensive Income Components Amount Reclassified from Other Comprehensive Income Affected Line Item in the Income Statement
  UNS Energy TEP  
  Year Ended December 31, 2013  
  Thousands of Dollars  
Realized Losses on Cash Flow Hedges      
Interest Rate Swaps - Debt $(1,377) $(1,166) Interest Expense Long-Term Debt
Interest Rate Swaps - Capital Leases (2,429) (2,429) Interest Expense Capital Leases
Commodity Contracts (747) (747) Purchased Energy/Purchased Power
Tax Benefit 1,801
 1,718
  
Realized Losses on Cash Flow Hedges, Net of Taxes (2,752) (2,624)  
       
Amortization of SERP and Defined Benefit Plans      
Prior Service Costs (1,488) (1,488) Other Expense
Tax Benefit 572
 572
  
Amortization, Net of Taxes (916) (916)  
       
Total Reclassifications from Other Comprehensive Income for the Period $(3,668) $(3,540)  
 December 31,
(in millions)2015 2014
Beginning of Period$4
 $2
Additions Based on Tax Positions Taken in the Current Year1
 2
End of Period$5
 $4
Unrecognized tax benefits, if recognized, would reduce income tax expense by $1 million at December 31, 2015 and would not reduce income tax expense at December 31, 2014.
TEP recorded no interest expense during 2015 and 2014 related to uncertain tax positions. In addition, TEP had no interest payable and no penalties accrued at December 31, 2015 and 2014.
TEP has been audited by the IRS through tax year 2010. TEP is not currently under audit by any federal or state tax agencies. The balance in unrecognized tax benefits could change in the next 12 months as a result of IRS audits, but we are unable to determine the amount of change.


NOTE 17.13. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
The FinancialWe consider the applicability and impact of all Accounting Standards Board (FASB) issued guidance for the recognition, measurement,Updates. Updates not listed below were assessed and disclosure of certain obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date. On adoption, an entity would recognize and disclose in the financial statements its obligation from a joint and several liability arrangement as the sum of the amount the entity agreed with its co-obligors that it will pay, and any additional amount the entity expectsdetermined to pay on behalf of its co-obligors. This guidance will be effective in the first quarter of 2014. We doeither not expect the adoption of this guidanceapplicable or are expected to have a materialminimal impact on our consolidated financial condition,position, results of operations, or cash flows.disclosures.
TheRevenue from Contracts with Customers
In May 2014, the FASB issued an accounting standards update that will eliminate the transaction and industry-specific revenue recognition guidance which permitsunder current U.S. GAAP and replace it with a principles based approach for determining revenue recognition. The revenue standard requires entities to apply the guidance retrospectively or recognize the cumulative effect of initially applying the guidance as an entityadjustment to designate the Federal Funds Rate (the interest rate at which depository institutions lend balancesopening balance of retained earnings supplemented by additional disclosures. In July 2015, the FASB voted to each other overnight) as a benchmark interest rate for fair value and cash flow hedges. Prior to this guidance, only interest rates on direct treasury obligations of the U.S. Government and the LIBOR were considered benchmark interest rates in the U.S. This guidance is effective immediately, and can be applied prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. We have not entered into any new cash flow or fair value hedges sincedefer the effective date of the revenue recognition standard by one year. We are required to adopt the new guidance for annual and interim periods beginning January 1, 2018.
Retail sales of electricity based on regulator-approved tariff rates represent TEP's primary source of revenue. While it is expected that tariff-based sales to regulated customers are within the scope of the new standard, this guidance. We do not expect this guidance to have a material impact on our financial condition, resultsquestion is being reviewed by the AICPA Financial Reporting Executive Committee. TEP is in the process of operations, or cash flows.assessing its performance obligations in its wholesale contracts and identifying other contracts with customers.
TheClassification and Measurement of Financial Instruments
In January 2016, the FASB issued newamended the guidance on the classification and measurement of financial statement presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. We will be required to comply withinstruments. Most notably, the guidance on a prospective basis beginning innew accounting standard update requires the first quarter of 2014. Although adoption of this new guidance may impact how such items are classified on our balance sheets, we do not expect such change to be material. In addition, we do not expect any material changes in the presentations of our other financial statements.


NOTE 18. QUARTERLY FINANCIAL DATA (UNAUDITED)following:

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Concluded)

all equity investments in unconsolidated entities (other than those accounted for using the equity method of accounting) to be measured at fair value through earnings; however, entities will be able to elect to record equity investments without readily determinable fair values at cost, less impairment, and plus or minus subsequent adjustments for observable price changes; and
financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset.
TEP is required to adopt the new guidance for annual and interim periods beginning January 1, 2018. TEP is evaluating the impact to our financial statements and disclosures.

NOTE 14. QUARTERLY FINANCIAL DATA (UNAUDITED)
Our quarterly financial information is unaudited, but, in management’s opinion, includes all adjustments necessary for a fair presentation. Our utility businesses arebusiness is seasonal in nature. Peak sales periods for TEP and UNS Electric generally occur during the summer while UNS Gas’ sales generally peak during the winter.summer. Accordingly, comparisons among quarters of a year may not represent overall trends and changes in operations.
 UNS Energy
First Second Third Fourth
 Thousands of Dollars
(Except Per Share Amounts)
2013       
Operating Revenue$332,141
 $365,217
 $437,041
 $350,161
Operating Income39,895
 60,803
 129,765
 41,033
Net Income11,345
 34,618
 67,990
 13,525
Basic EPS0.27
 0.83
 1.63
 0.32
Diluted EPS0.27
 0.83
 1.62
 0.32
2012       
Operating Revenue$315,387
 $363,998
 $434,108
 $348,273
Operating Income (1)
34,403
 68,065
 106,409
 42,918
Net Income6,476
 26,273
 50,664
 7,506
Basic EPS0.17
 0.65
 1.22
 0.18
Diluted EPS0.17
 0.64
 1.21
 0.18
EPS is computed independently for each of the quarters presented. Therefore, the sum of the quarterly EPS amounts may not equal the total for the year.
 TEP
First Second Third Fourth
 Thousands of Dollars
2013       
Operating Revenue$247,751
 $304,263
 $371,239
 $273,437
Operating Income22,747
 53,433
 123,177
 31,014
Net Income1,478
 30,787
 64,167
 4,910
2012       
Operating Revenue$223,978
 $299,419
 $366,910
 $271,353
Operating Income (1)
17,898
 58,211
 94,079
 30,299
Net Income (Loss)(1,461) 21,910
 44,569
 452
(1)Immaterial variances from quarterly amounts previously reported result from line item reclassifications.
 First Quarter Second Quarter Third Quarter Fourth Quarter
(in millions)

2015
Operating Revenue$273
 $340
 $409
 $284
Operating Income28
 74
 120
 36
Net Income9
 38
 69
 12
        
(in millions)

2014
Operating Revenue$256
 $322
 $387
 $305
Operating Income32
 80
 85
 34
Net Income9
 39
 40
 15


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Schedule II—Valuation and Qualifying Accounts – UNS Energy
Allowance for Doubtful Accounts (1)
Beginning
Balance
 
Additions-
Charged  to
Income
 Deductions 
Ending
Balance
 Millions of Dollars
Year Ended December 31,       
2013$7
 $2
 $2
 $7
201216
 4
 13
 7
201113
 5
 2
 16
Other Reserves (2)
Beginning Balance Ending Balance
 Millions of Dollars
Year Ended December 31,   
2013$9
 $6
20126
 9
20114
 6
Schedule II—Valuation and Qualifying Accounts—TEP
Allowance for Doubtful Accounts (1)
 
Beginning
Balance
 
Additions-
Charged  to
Income
 Deductions 
Ending
Balance
  Millions of Dollars
Year Ended December 31,        
2013 $5
 $2
 $2
 $5
2012 14
 3
 12
 5
2011 11
 4
 1
 14
Other Reserves (2)
Beginning Balance Ending Balance
 Millions of Dollars
Year Ended December 31,   
2013$8
 $4
20124
 8
20113
 4
(1)
TEP, UNS Electric, and UNS Gas record additions to the Allowance for Doubtful Accounts based on historical experience and any specific customer collection issues identified. Deductions principally reflect amounts charged off as uncollectible, less amounts recovered. Amounts include reserves for trade receivables, wholesales sales, and in-kind transmission imbalances.
(2)
As the Other reserves are not individually significant, additions and deductions need not be disclosed. Principally reserves for sales tax audits, litigation matters, and damages billable to third parties.


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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
None.


ITEM 9A. CONTROLS AND PROCEDURES
UNS Energy’s and TEP’s Chief Executive Officer and Chief Financial Officer supervised and participated in UNS Energy’s and TEP’s evaluation of theirits disclosure controls and procedures as such term is defined under Rule 13a – 15(e) or Rule 15d – 15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act), as of the end of the period covered by this report. Disclosure controls and procedures are controls and procedures designed to ensure that information required to be disclosed in UNS Energy’s and TEP’s periodic reports filed or submitted under the Exchange Act, is recorded, processed, summarized, and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms. These disclosure controls and procedures are also designed to ensure that information required to be disclosed by UNS Energy and TEP in the reports that they fileit files or submitsubmits under the Exchange Act is accumulated and communicated to management, including the principal executive and principal financial officers, or personpersons performing similar functions, as appropriate to allow timely decisions regarding required disclosure. Based upon the evaluation performed, UNS Energy’s and TEP’s Chief Executive Officer and Chief Financial Officer concluded that UNS Energy’s and TEP’s disclosure controls and procedures are effective.
While UNS Energy and TEP continually strivestrives to improve theirits disclosure controls and procedures to enhance the quality of theirits financial reporting, there has been no change in UNS Energy’s or TEP’s internal control over financial reporting during the fourth quarter of 20132015 that has materially affected, or is reasonably likely to materially affect, UNS Energy’s or TEP’s internal control over financial reporting.
UNS Energy’s and TEP’s Management’s Reports on Internal Control Over Financial Reporting Under 404 of Sarbanes-Oxley appear as the first two reports under Item 8 in UNS Energy’s and TEP’s 2013 Annual Report on Form 10-K, the Report of Independent Registered Public Accounting Firm for UNS Energy appears as the third report under Item 8, and the Report of Independent Registered Public Accounting Firm for TEP appears as the fourth report under Item 8.


ITEM 9B. OTHER INFORMATION
None.


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PART III
ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE OF THE REGISTRANTS
Directors
All of the members of the TEP Board of Directors are executive officers and employees of TEP, a wholly owned subsidiary of UNS EnergyEnergy.
The directors of TEP are elected annually by TEP's sole shareholder, UNS Energy, acting at the direction of the Board of Directors of UNS Energy.
The names and information concerning the members of the TEP Board of Directors are set forth below:
Name Age 
Board
Committee*
 
Director
Since
Paul J. Bonavia 62
 None 2009
David G. Hutchens 47
 None 2013
Lawrence J. Aldrich 61
 1,2,3 2000
Barbara M. Baumann 58
 1,2,4 2005
Larry W. Bickle 68
 4,5 1998
Robert A. Elliott 58
 1,2,3,4,5 2003
Daniel W.L. Fessler 72
 2,3 2005
Louise L. Francesconi 61
 1,2,3 2008
Ramiro G. Peru 58
 1,4,5 2008
Gregory A. Pivirotto 61
 1,2,4 2008
Joaquin Ruiz 61
 3,5 2005
*Board Committees
(1)Audit
(2)Compensation
(3)Corporate Governance and Nominating
(4)Finance
(5)Environmental, Safety and Security
Paul J. BonaviaMr. Bonavia has served as Chairman and Chief Executive Officer of UNS Energy and TEP since January 2009; he also served as President from January 2009 to December 2011. Prior to joining UNS Energy, Mr. Bonavia served as President of the Utilities Group of Xcel Energy. Mr. Bonavia previously served as President of Xcel Energy’s Commercial Enterprises business unit and President of the company’s Energy Markets unit.
David G. HutchensMr. Hutchens has served as President and Chief Operating Officer of UNS Energy and TEP since August 2013. In December 2011 Mr. Hutchens was named President of UNS Energy and TEP. In March 2011, Mr. Hutchens was named Executive Vice President of UNS Energy and TEP. In May 2009, Mr. Hutchens was named Vice President of Energy Efficiency and Resource Planning. In January 2007, Mr. Hutchens was elected Vice President of Wholesale Energy at UNS Energy and TEP. Mr. Hutchens joined TEP in 1995.
Lawrence J. AldrichChairman and Executive Director, Arizona Business Coalition on Health, since October 2011; President and Chief Executive Officer of University Physicians Healthcare (UPH), a healthcare organization, from 2009 to 2010; Senior Vice President/Corporate Operations and General Counsel for UPH from 2007 to 2008; President of Aldrich Capital Company, an acquisition, management and consulting firm, since January 2007; Chief Operating Officer of The Critical Path Institute, a non-profit medical research company focusing in drug development, from 2005 to 2007.
Name Age Served As Director Since Business Experience
David G. Hutchens 49 2011 
Mr. Hutchens has served as Chief Executive Officer of TEP since 2014; President of TEP since 2011; Executive Vice President of TEP in 2011; Vice President of TEP from 2007-2011. Mr. Hutchens joined TEP in 1995.
Mr. Hutchens' extensive experience in the electric and gas utility business and his position as President and Chief Executive Officer provide him with intimate knowledge of TEP's operations and such experience contributes to the diverse knowledge, experience, skills and qualifications of the TEP Board.
Kevin P. Larson 59 2009 
Mr. Larson has served as Senior Vice President and Chief Financial Officer of TEP since September 2005. Mr. Larson joined TEP in 1985 and thereafter held various positions in its finance department and investment subsidiaries. He was elected Vice President in March 1997. In October 2000, he was elected Vice President and Chief Financial Officer. Mr. Larson is also a Chartered Financial Analyst.
Mr. Larson's extensive experience in the electric and gas utility business and his position as Senior Vice President and Chief Financial Officer provide him with intimate knowledge of TEP's financial affairs and such experience contributes to the diverse knowledge, experience, skills and qualifications of the TEP Board.
Todd. C. Hixon 49 2015 
Mr. Hixon has served as Vice President and General Counsel of TEP since May 2011. Mr. Hixon joined TEP’s legal department in 1998 and served in a variety of capacities, most recently serving as Associate General Counsel.
Mr. Hixon's extensive experience in utility legal and regulatory matters and his position as Vice President and General Counsel provide him with intimate knowledge of TEP's legal and regulatory affairs and such experience contributes to the diverse knowledge, experience, skills and qualifications of the TEP Board.

K-14190


Executive Officers
Executive Officers, who are elected annually by TEP’s Board of ContentsDirectors, acting at the direction of the Board of Directors of UNS Energy, are as follows:
Name Age Position(s) Held 
Executive
Officer Since
David G. Hutchens 49
 President and Chief Executive Officer 2007
Kevin P. Larson 59
 Senior Vice President and Chief Financial Officer 1997
Kentton C. Grant 57
 Vice President and Treasurer 2007
Susan M. Gray 43
 Vice President, T&D Operations and Engineering 2015
Todd C. Hixon 49
 Vice President and General Counsel 2011
Karen G. Kissinger 61
 Vice President and Chief Compliance Officer 1991
Mark C. Mansfield 60
 Vice President, Energy Resources 2012
Frank P. Marino 51
 Vice President and Controller 2013
Thomas A. McKenna 67
 Vice President, Energy Delivery 2007
Catherine E. Ries 56
 Vice President, Customer and Human Resources 2007
Mary Jo Smith 58
 Vice President, Public Policy 2015
Herlinda H. Kennedy 54
 Corporate Secretary 2006

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Barbara M. BaumannPresident and Owner of Cross Creek Energy Corporation, a management consultant and investor company for oil and gas, since 2003; Director of Devon Energy Corporation, an oil and gas exploration company, since 2014; Director of SM Energy Company (formerly St. Mary Land & Exploration), an oil and gas production company, from 2002 - 2014; Member of the Board of Trustees of The Putnam Funds since 2010; Director of Cody Resources, a privately held energy, ranching and commercial real estate company, since 2010.
Larry W. BickleDirector of SM Energy Company (formerly St. Mary Land & Exploration), an oil and gas production company, since 1994; Retired private equity investor since 2007; Managing Director of Haddington Ventures, LLC, a private equity fund, from 1997 to 2007; Non-executive Chairman of Quantum Natural Gas Storage, LLC, a natural gas storage company, since 2008; Co-founder, Chairman and CEO of TPC Corp (NYSE: TPC), a natural gas company, until sold to PacifiCorp in 1997.
Robert A. ElliottPresident and owner of Elliott Accounting, an accounting, tax, management and investment advisory services firm, since 1983; Vice Chairman of AAA of Arizona, a regional automotive and travel club, since 2012 and Director since 2007; Director and Corporate Secretary of Southern Arizona Community Bank, a banking institution, from 1998 to 2010; Television Analyst/Pre-game Show Co-host for Fox Sports Arizona from 1998 to 2009; Chairman of the Board of the Tucson Airport Authority, an airport operator/manager, from January 2006 to January 2007; President and Chairman of the Board of the National Basketball Retired Players Association from 2011 to 2013; Director of University of Arizona Foundation, a philanthropic organization, since 2011.
Daniel W.L. FesslerPresident of the California Public Utility Commission, a public utility regulatory agency, from 1991 to 1996; Professor Emeritus of the University of California, an educational institution, since 1994; Of Counsel for the law firm of Holland & Knight from 2003 to 2007; Partner in the law firm of LeBoeuf, Lamb, Greene & MacRae LLP from 1997 to 2003; previously served on the UNS Energy and TEP boards of directors from 1998 to 2003; Managing Principal of Clear Energy Solutions, LLC, a company that advocates coal-to-synthetic fuels, since December 2004.
Louise L. FrancesconiPresident of Raytheon Missile Systems, a defense electronics corporation, from 1997 to 2008; Director of Stryker Corporation, a medical technology company, since July 2006; Chairman of the Board of Trustees for TMC Healthcare, a hospital, since 1999; Director of Global Solar Energy, Inc., a manufacturer of solar panels and other solar-related products, from 2008 to 2011.
Ramiro G. PeruExecutive Vice President and Chief Financial Officer of Swift Corporation from June 2007 to December 2007; Executive Vice President and Chief Financial Officer of Phelps Dodge Corporation from 2004 to 2007; Senior Vice President and Chief Financial Officer of Phelps Dodge Corporation from 1999 to 2004; Director of WellPoint, Inc. since 2004.
Gregory A. PivirottoAdjunct Professor at the University of Arizona College of Law since 2013; President, Chief Executive Officer and Director of University Medical Center Corporation, in Tucson, from 1994 to 2010; certified public accountant since 1978; Director of Arizona Hospital & Healthcare Association, a trade association providing advocacy, education and service to hospitals and other healthcare organizations, from 1997 to 2005; Director of Tucson Airport Authority, an airport operator/manager, from 2008 - January 2014; Member of the Advisory Board of Harris Bank from 2010 - 2013. Director of the Arizona Donor Network Association from 1993 to 2006 and since 2012.
Joaquin RuizProfessor of Geosciences, University of Arizona, an educational institution, since 1983; Dean, College of Science, University of Arizona, since 2000; Executive Dean of the University of Arizona College of Letters, Arts and Science since 2009 and Vice President for Strategy and Innovation since 2012.

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Directors – TEP
Name Age 
Director
Since
Paul J. Bonavia 62 2009
David G. Hutchens 47 2011
Kevin P. Larson 57 2009
Paul J. BonaviaMr. Bonavia has served as Chairman and Chief Executive Officer of UNS Energy and TEP since January 2009; he also served as President from January 2009 to December 2011. Prior to joining UNS Energy, Mr. Bonavia served as President of the Utilities Group of Xcel Energy. Mr. Bonavia previously served as President of Xcel Energy’s Commercial Enterprises business unit and President of the company’s Energy Markets unit.
David G. HutchensMr. Hutchens has served as Chief Executive Officer of TEP since 2014; President of UNS Energy and TEP since December 2011. In March 2011, Mr. Hutchens was named2011; Executive Vice President of UNS Energy and TEP. In May 2009, Mr. Hutchens was namedTEP in 2011; Vice President of Energy Efficiency and Resource Planning. In January 2007, Mr. Hutchens was elected Vice President of Wholesale Energy at UNS Energy and TEP.TEP from 2007-2011. Mr. Hutchens joined TEP in 1995.
Kevin P. LarsonMr. Larson has served as Senior Vice President and Chief Financial Officer of UNS Energy and TEP since September 2005. Mr. Larson is also Treasurer of UNS Energy. Mr. Larson joined TEP in 1985 and thereafter held various positions in its finance department and investment subsidiaries. He was elected Treasurer in August 1994 and Vice President in March 1997. In October 2000, he was elected Vice President and Chief Financial Officer.
Kentton C. GrantMr. Grant was elected Treasurer in 2010 and has served as Vice President of TEP since January 2007. Mr. Grant joined TEP in 1995.
Susan GrayMs. Gray has served as Vice President of T&D Operations and Engineering since 2015. Ms. Gray joined TEP in 1994 as a student engineer, and has served in a variety of capacities since then, most recently serving as Senior Director of T&D.
Todd C. HixonMr. Hixon has served as Vice President and General Counsel of TEP since May 2011. Mr. Hixon joined TEP’s legal department in 1998 and served in a variety of capacities, most recently serving as Associate General Counsel.
Karen G. KissingerMs. Kissinger has served as Vice President and Chief Compliance Officer of TEP since August 2013. Ms. Kissinger served as Vice President, Controller, and Chief Compliance Officer from 2001 to 2013. Ms. Kissinger joined TEP as Vice President and Controller in January 1991.
Mark C. MansfieldMr. Mansfield has served as Vice President, Energy Resources since 2012. He joined the company in 2008 as Senior Director of Generation.
Frank P. MarinoMr. Marino has served as Vice President and Controller of TEP since August 2013. Mr. Marino joined TEP as Assistant Controller in January 2013. Prior to joining TEP, he served in various roles at the AES Corporation, a global power company. In 2012 he served as AES' Vice President for Business Demand and Outsourcing Management, and from 2007-2011 he served as Chief Financial Officer for two different business units.
Thomas A. McKennaMr. McKenna has served as Vice President, Energy Delivery since August 2013. Mr. McKenna was named Vice President, Engineering in January 2007. Mr. McKenna joined an affiliate of TEP in 1998. Mr. McKenna is retiring from TEP on May 1, 2016.
Catherine E. RiesMs. Ries has served as Vice President, Customer and Human Resources since August 2015. Prior to that she served as Vice President of Human Resources and Information Technology, since May 2011. Ms. Ries joined TEP as Vice President of Human Resources in June 2007.
Mary Jo SmithMs. Smith has served as Vice President of Public Policy since 2015. Ms. Smith joined TEP as Director of Investor Relations in 2003 and most recently served as Senior Director of Regulatory Services and Corporate Communications.
Herlinda H. KennedyMs. Kennedy has served as Corporate Secretary of TEP since September 2006. Ms. Kennedy joined TEP in 1980 and was named assistant Corporate Secretary in 1999.
Executive OfficersCode of Ethics
See Part I, Item 1. Business, SEC Reports Available on TEP's Website.
Audit and Risk Committee of the UNS Energy Board
The Audit and Risk Committee of the Board of Directors of UNS Energy was established for the purpose of overseeing the accounting and financial reporting process and audits of the financial statements of UNS Energy and TEPits consolidated subsidiaries, including TEP.
The Audit and Risk Committee reviews current and projected financial results of operations, selects an independent registered public accounting firm to audit UNS Energy’s and TEP’s financial statements annually, reviews and discusses the scope of such audit, receives and reviews the audit reports and recommendations and transmits its recommendations to the UNS Energy Board of Directors. The Audit and Risk Committee of UNS Energy reviews UNS Energy’s and TEP’s accounting and internal control procedures with the internal audit department from time to time, makes recommendations to the board of UNS Energy for any changes deemed necessary in such procedures and performs such other functions as delegated by the UNS Energy Board of Directors.
The following UNS Energy directors are members of the Audit and Risk Committee of UNS Energy’s Board of Directors:
Ramiro G. Peru, Chair
Robert A. Elliott

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James P. Laurito
Gregory A. Pivirotto
Joaquin Ruiz
All Audit and Risk Committee members possess the level of financial literacy and accounting or related financial management expertise required by New York Stock Exchange (NYSE) rules. UNS Energy’s Board of Directors has determined that, while each member of the Audit and Risk Committee has accounting and/or related financial management expertise, Mr. Ramiro Peru is an “audit committee financial expert” as that term is defined by applicable SEC regulations.
Human Resources and Governance Committee of the UNS Energy Board
TEP is a wholly owned subsidiary of UNS Energy. As described in Part III, Item 11 Executive Compensation below, the TEP Board of Directors does not have a Compensation Committee and does not make compensation-related decisions for the executive officers of TEP. Instead, the UNS Energy Board of Directors' Human Resources and Governance Committee makes compensation-related decisions, including the approval of the compensation plan described in Part III, Item 11 Executive Compensation.
The following UNS Energy directors are members of the Human Resources and Governance Committee of UNS Energy’s Board of Directors:
Louise L. Francesconi, Chair
Lawrence J. Aldrich
Robert A. Elliott
Barry Perry
UNS Energy Directors
Due to the role of the Audit and Risk Committee and the Human Resources and Governance Committee of the UNS Energy Board of Directors described above, the following information is included with respect to the members of the UNS Energy Board of Directors (other than with respect to Mr. Hutchens, who is also a member of the Board of Directors of UNS Energy):
Name Age Served as Director Since Business Experience
Lawrence J. Aldrich 63 2000 
Partner, Newport Board Group, since 2014; Chairman and Executive Director, Arizona Business Coalition on Health, since 2011; President and Chief Executive Officer of University Physicians Healthcare (UPH), a healthcare organization, from 2009 to 2010; Senior Vice President/Corporate Operations and General Counsel for UPH from 2007 to 2008; President of Aldrich Capital Company, an acquisition, management and consulting firm, since 2007; Chief Operating Officer of The Critical Path Institute, a non-profit medical research company focusing in drug development, from 2005 to 2007.
Mr.��Aldrich’s extensive experience in the areas of public relations/advertising, finance, legal, human resources, marketing, engineering, operations, government/regulatory, information technology, insurance/health care, and his significant community involvement in Arizona and Tucson contribute to the diverse knowledge, skills and qualifications of the UNS Energy Board.

93



Robert A. Elliott 60 2003 
President and owner of Elliott Accounting, an accounting, tax, management and investment advisory services firm, since 1983; Chair of AAA of Arizona, a regional automotive and travel club, since 2014 and Director since 2007; Director and Corporate Secretary of Southern Arizona Community Bank, a banking institution, from 1998 to 2010; Television Analyst/Pre-game Show Co-host for Fox Sports Arizona from 1998 to 2009; Chairman of the Board of the Tucson Airport Authority, an airport operator/manager, from January 2006 to January 2007; President and Chairman of the Board of the National Basketball Retired Players Association from 2011-2013; Director of University of Arizona Foundation, a philanthropic organization, since 2011.
Mr. Elliott’s extensive experience in the areas of accounting, audit, banking and corporate tax, and his significant community involvement in Arizona and Tucson contribute to the diverse knowledge, skills and qualifications of the UNS Energy Board.
Louise L. Francesconi 63 2008 
President of Raytheon Missile Systems, a defense electronics corporation, from 1997 until her retirement in 2008; Director of Stryker Corporation, a medical technology company, since July 2006; Chairman of the Board of Trustees for TMC Healthcare, a hospital, since 1999; Director of Global Solar Energy, Inc., a manufacturer of solar panels and other solar-related products, from 2008 to 2011.
Ms. Francesconi’s extensive experience in the areas of accounting, public relations/advertising, finance, legal, human resources/benefits, marketing, engineering, operations, audit, government/regulatory, information technology and insurance/healthcare, and her significant community involvement in Arizona and Tucson contribute to the diverse knowledge, skills and qualifications of the UNS Energy Board.
James P. Laurito 59 2014 
President and CEO of Central Hudson Gas & Electric Company since November 1, 2014. Mr. Laurito joined Central Hudson as President in November 2009. Prior to that, he served as President of both New York State Electric and Gas Corporation and Rochester Gas & Electric Corporation from 2003 until 2009.
Mr. Laurito's extensive experience in the electric and gas utility business contribute to the diverse knowledge, skills and qualifications of the UNS Energy Board.
Barry Perry 51 2014 
President and CEO of Fortis since December 31, 2014.
Prior to his current position at Fortis, Mr. Perry served as Vice President, Finance and CFO of Fortis since 2004. Mr. Perry joined the Fortis organization in 2000 as VP, Finance and CFO of Newfoundland Power. Previously, he held the position of VP, Treasurer with a global forest products company and Corporate Controller with a large crude oil refinery.
Mr. Perry's extensive experience in the electric and gas utility business contribute to the diverse knowledge, skills and qualifications of the UNS Energy Board.
Ramiro G. Peru 60 2008 
Executive Vice President and Chief Financial Officer of Phelps Dodge Corporation, a mining corporation, from 2004 until his retirement in 2007; Senior Vice President and Chief Financial Officer of Phelps Dodge Corporation from 1999 to 2004; Director of Anthem, Inc. (formerly WellPoint, Inc.), a health benefits company, since 2004; Board of Directors, Fiesta Bowl, since 2012; Director of SM Energy Company, 2014 - 2015.
Mr. Peru’s extensive experience in the areas of accounting, corporate communications, finance, legal, human resources/benefits, audit, government/regulatory, corporate tax, information technology, insurance/health care and environmental contributes to the diverse knowledge, skills and qualifications of the UNS Energy Board.

94



Gregory A. Pivirotto 63 2008 
President, Chief Executive Officer and Director of University Medical Center Corporation, in Tucson, from 1994 until his retirement in 2010; Adjunct Professor at the University of Arizona College of Law since 2013; certified public accountant since 1978; Director of Arizona Hospital & Healthcare Association, a trade association providing advocacy, education and service to hospitals and other healthcare organizations, from 1997 to 2005; Director of Tucson Airport Authority, an airport operator/manager, from 2008 to January 2014; Member of the Advisory Board of Harris Bank Arizona from 2010 to 2013; Director of the Donor Network of Arizona from 1993 to 2006 and since 2012.
Mr. Pivirotto’s extensive experience in the areas of accounting, public relations/advertising, finance, legal, human resources/benefits, marketing, operations, audit, government/regulatory, banking, corporate tax, information technology and insurance/healthcare, and his significant community involvement in Arizona and Tucson contribute to the diverse knowledge, skills and qualifications of the UNS Energy Board.
Joaquin Ruiz 64 2005 
Professor of Geosciences, University of Arizona, an educational institution, since 1983; Dean, College of Science, University of Arizona, since 2000; Executive Dean of the University of Arizona College of Letters, Arts and Science since 2009 and Vice President for Strategy and Innovation since 2012.
Mr. Ruiz’s extensive experience in the areas of renewables and environmental, public relations/advertising, human resources/benefits, operations, government/regulatory, information technology, and his significant community involvement in Arizona and Tucson contribute to the diverse knowledge, skills and qualifications of the UNS Energy Board.


95


ITEM 11. EXECUTIVE COMPENSATION
COMPENSATION DISCUSSION AND ANALYSIS
This section describes TEP’s overall executive compensation policies and practices and specifically analyzes the total compensation for the following executive officers, referred to as the Named Executives:
David G. Hutchens, President and Chief Executive Officer;
Kevin P. Larson, Senior Vice President and Chief Financial Officer;
Karen G. Kissinger, Vice President and Chief Compliance Officer;
Todd C. Hixon, Vice President and General Counsel; and
Kentton C. Grant, Vice President and Treasurer
COMPENSATION PHILOSOPHY
Compensation Committee
TEP is a wholly owned subsidiary of UNS Energy (itself a wholly owned, indirect subsidiary of Fortis). The TEP Board of Directors does not have a Compensation Committee and does not make compensation-related decisions for the executive officers of TEP. The same individuals serve as executive officers of both UNS Energy and TEP. The UNS Energy Board of Directors Human Resources and Governance Committee makes all compensation decisions for all such executive officers, including the design of the 2015 executive compensation program, and also approves this disclosure, among other responsibilities. Any references to a Compensation Committee in this section refer to the UNS Energy Human Resources and Governance Committee.
TEP Compensation as a Component of UNS Energy Total Compensation
The Compensation Committee designs its programs to compensate UNS Energy executive officers for services to UNS Energy and all UNS Energy subsidiaries, including TEP. The amounts shown in this section represent the Named Executives' compensation allocated to TEP and its subsidiaries only, which, in 2015 amounts to 80.90% of the Named Executives total compensation for service provided to UNS Energy and its subsidiaries. The percentage allocated to TEP is obtained using the Massachusetts formula, an industry-wide accepted method of allocating common costs to affiliated entities based on an equal weighting of payroll costs, plant/tangible assets and total revenues. References to the Company refer to UNS Energy and include all UNS Energy subsidiaries. The Performance Enhancement Plan (PEP) includes target goals attributable to TEP, UNS Electric, and UNS Gas.
Objectives of the Compensation Program
The Compensation Committee has established a balanced total compensation program that ensures that a significant part of executive officer compensation is performance-based. Corporate goals are designed to focus executive officers and all non-union employees on successful execution of the Company’s strategy and annual operating plan.
The Company’s executive officer compensation policies and decisions have the following objectives:
1.Attracting, motivating and retaining highly-skilled executives;
2.Linking the payment of compensation to the achievement of critical short- and long-term financial and strategic objectives; providing safe, reliable and economically available electric and gas service; and aligning performance objectives of management with those of its other employees by using similar performance measures for both groups;
3.Balancing risk and reward to align the interests of management with those of the Company’s stakeholders and encouraging management to think and act like owners, taking into account the interests of the public that the Company serves;
4.Maximizing the financial efficiency of the compensation program to avoid unnecessary tax, accounting and cash flow costs; and
5.Encouraging management to achieve outstanding results through appropriate means by delivering compensation in a manner consistent with established and emerging corporate governance “best practices."

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Summary of 2015 Executive Officer Compensation Program
Compensation ComponentKey FeaturesPurpose
Base Salary
Increases considered on an annual basis to remain near the median of the Company's peer group (as described in Elements of Compensation - Base Salary, below)
Intended to constitute a sufficient component of total compensation to discourage inappropriate risk-taking
Provide a fixed amount of cash compensation to the Company's Named Executives
Short-term Incentive
Compensation (Performance Enhancement Program or PEP)
Incentive plans are structured identically for executive and non-executive employees and across business units/functions, uniting all non-union employees in the achievement of common goals
All incentive plans are capped at 150% of target, protecting against the possibility that executives would try to maximize bonuses by taking short-term actions not supportive of long-term objectives.
Must achieve at least the threshold level of net income to receive payment above 50% of target for other performance measures; this cap limits non-financial goal payout if the financial goals are not met
Motivate and reward achieving or exceeding the Company's short-term performance goals, reinforcing pay-for-performance
Focus entire Company on key customer, operational and financial objectives
Long-Term Incentive
Compensation (LTI or equity-
based compensation)
LTI compensation is delivered in a combination of performance share units (PSUs) and restricted share units (RSUs)
Ultimate value earned from the LTI program is based on both absolute and relative shareholder value and longer-term operating performance
PSUs represent 67% of the target award with 50% of the shares earned based on achievement of cumulative net income goals and 50% of the shares earned based on achievement of Fortis's TSR relative to an industry peer group over a three-year period
RSUs represent 33% of the target awards, and cliff vest on the 3rd anniversary of grant
Opportunities for ownership and financial reward in support of the Company’s longer-term financial goals and stock price growth; also supports retention objective
Provide a link between compensation and long-term shareholder interests as reflected in changes in Fortis stock price
The Compensation Committee considers decisions regarding each component of pay in the context of each executive officer’s total compensation. For example, if the Compensation Committee increases an executive officer’s base salary, it also considers the resultant impact on short- and long-term performance-based incentive compensation and compares total compensation levels to competitive practice. See Item 1. Business, Executive OfficersCompensation Analysis, below. The Compensation Committee does not directly consider the value of previous equity awards in setting current year total compensation opportunities, but does review the value of outstanding equity awards to assess the degree to which such awards support the Company’s performance motivation, retention, and shareholder alignment objectives.
Each of these components is described in more detail below and in the narrative and footnotes to the supporting tables. The following sections highlight how the above objectives are reflected in the Company’s compensation program.
Attracting, Retaining and Motivating Executives
To attract, retain and motivate highly-skilled employees, the Company provides the Named Executives with compensation packages that are competitive with those offered by other electric and gas utility companies of comparable size and complexity and/or electric and gas utility companies thought to be competitors for executives.

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The Compensation Committee generally targets total direct compensation for the Named Executives to be, on average, at the median of selected comparable companies identified below under the Compensation Analysis section. Under this approach, newly promoted executives and those new to their role may be placed below the median to reflect their limited experience and evolving skill set. Similarly, executives with longer tenure and therefore an above-market skill set, or those executives who are sustained high performers over time and are most critical to the Company’s long-term success, may be placed above the median. The Company believes that this strategy enables it to successfully hire, motivate and retain talented executives while ensuring a reasonable overall compensation cost structure relative to its peers.
In addition to providing competitive direct compensation opportunities, the Company also provides certain indirect compensation and benefits programs that are intended to assist in attracting and retaining high quality executives. These programs include pension and retirement programs and are described in more detail below and in the narratives that accompany the tables that follow this section.
Linking Compensation to Performance
The Company’s compensation program seeks to link the actual compensation earned by the Named Executives to their performance and that of the Registrants.Company and Fortis. To ensure that the executive officers are held accountable for achieving the Company’s financial, operational and strategic objectives and for creating Fortis shareholder value, the Company believes that the percentage of pay at risk should increase with the level of responsibility within the Company. The target amounts of performance-based pay programs comprise approximately 45% to 70% of the total direct compensation opportunity for the Named Executives. Of the performance-based compensation, approximately 30-50% is short-term and 50-70% is long-term. Placing a greater emphasis on long-term performance-based compensation encourages executive officers to focus on the long-term impact of their actions. Non-variable compensation, such as benefits and perquisites, is de-emphasized in the total compensation program to reinforce the linkage between compensation and performance.
Balancing Risk and Reward to Align the Interests of the Company’s Named Executives with Stakeholders
The Company's compensation program seeks to align the interests of the Named Executives with those of the Company’s key stakeholders, including Fortis shareholders, customers, the community and employees. The Company uses the short-term incentive compensation component to focus the Named Executives on the importance of providing safe and reliable customer service, creating a safe work environment for employees and improving financial performance by linking their short-term cash incentive compensation to achievement of these objectives. The Company uses an equity-based compensation component of its compensation package to align the interests of the Named Executives with those of the Fortis shareholders. The Company's compensation strategy mitigates risk by emphasizing long-term compensation and financial performance measures correlated with shareholder value. UNS Energy believes that equity-based compensation, together with the three-year vesting of share-based awards, result in compensation programs that do not encourage excessive risk-taking by management relating to the Company’s business and operations, and increase executive officer accountability in the performance of the Company. In addition, the Compensation Committee has the ability to reduce short-term incentive compensation award payouts, in its sole discretion, based upon factors other than Company performance measures. In considering the design alternatives, the Compensation Committee continually evaluates the potential for unintended consequences of its compensation program.
Maximizing the Financial Efficiency of the Program
In structuring the total compensation package for the Named Executives, the Compensation Committee evaluates the accounting cost, cash flow implications and tax deductibility of compensation to mitigate financial inefficiencies to the greatest extent possible. For instance, as part of this process, the Compensation Committee evaluates whether compensation costs are fixed or variable and places a heavier weighting on variable pay elements to calibrate expense with the achievement of operating performance objectives.
Adhering to Corporate Governance “Best Practices”
The Compensation Committee continually seeks to evaluate the executive officer compensation program in light of corporate governance “best practices.” For example, the short-term and long-term incentive compensation programs include a clawback provision, and the Change in Control Agreements do not contain an excise tax gross-up provision, all of which are discussed in more detail below.
The Compensation Committee also reviews tally sheets and wealth accumulation analyses, which are designed to assist the Compensation Committee in evaluating the reasonableness of the compensation provided to Named Executives.

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Compensation Analysis
To provide a foundation for the executive officer compensation program, the Company periodically benchmarks its Named Executives’ compensation levels and practices against a peer group of companies intended to represent the Company's competitors for business and talent. The peer group, which is reviewed periodically and approved by the Compensation Committee, includes the 12 utility companies named below that are comparable to UNS Energy in size, as measured by annual revenues and market capitalization (the Peer Group). As of November 2013, the date when the most recent benchmarking analysis was performed, UNS Energy’s revenues and number of employees approximate the median of the Peer Group; total assets and market capitalization were between the 25th percentile and the median; net income is below the 25th percentile.
2015 Peer Group
ALLETE, Inc.NorthWestern Corp.
Avista Corp.NV Energy, Inc.
Cleco Corp.PNM Resources Inc.
El Paso Electric Co.Portland General Electric Co.
Great Plains Energy, Inc.UIL Holdings Corp.
IDACORP Inc.Westar Energy Inc.
ELEMENTS OF COMPENSATION
Base Salary
The Company uses base salary to provide each Named Executive a set amount of money during the year with the expectation that he or she will perform his or her responsibilities to the best of his or her ability and in the best interests of the Company. The Company believes that competitive base salaries are necessary to attract and retain executives critical to achieving its business goals. In general, Named Executives’ base salaries are targeted to the median of the Peer Group described above. However, individual salaries can and do vary from the Peer Group median data based on such factors as: (i) the competitive environment for Named Executives; and (ii) incumbent responsibilities, experience, skills and performance relative to similarly situated executive officers within the Company. Named Executives' salaries range from below the 25th percentile to the median of the Peer Group at the time the last benchmarking review was conducted.
Increases to Named Executives’ base salaries are considered annually by the Compensation Committee. In approving base salary increases for Named Executives other than the CEO, the Compensation Committee also considers the CEO's recommendations.
In February 2015, the Compensation Committee approved 2% base salary increases for the Named Executives, which were consistent with salary increases as a percent of salary for other non-union Company employees. Base salary as a percentage of total compensation for the Named Executives ranged from approximately 30-55% of target total direct compensation. Additional information is provided in the Summary Compensation Table below.
InformationShort-Term Incentive Compensation (Cash Awards)
The Company's short-term incentive compensation consists of cash awards under the Performance Enhancement Plan (“PEP”), which links a significant portion of the Named Executives’ annual compensation to the Company’s annual financial and operational performance.
Each year, before the end of the first quarter, the Compensation Committee establishes performance objectives that must be met in whole or in part before the Company pays PEP awards. The key performance objectives are tailored to drive behavior that supports the Company’s strategy of delivering safe, reliable service and value to customers and a fair return to shareholders over time. The Compensation Committee generally attempts to align the target opportunity for each Named Executive, stated as a percentage of base salary, with the median rate for equivalent positions at the Peer Group companies. In 2015, the target short -term incentive opportunity for the Named Executives ranged from 40% to 80% of base salary, depending upon the Named Executive’s responsibilities (i.e., the greater the responsibility, the more pay at risk). The Company's Named Executives’ target incentive opportunities as a percent of base salary were near the Peer Group median at the time the last benchmarking review was conducted. As described more fully below, the actual amounts paid depend on the achievement of specified performance objectives and could range from 50% of the target award upon achievement of threshold performance to 150% of the target award upon achievement of exceptional performance.

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Financial and Operating Performance Objectives-2015
The PEP performance targets and weighting are based on factors that are essential for the long-term success of the Company and are identical to the performance objectives used in its performance plan for other non-union employees. In 2015, the objectives were: (i) net income; (ii) O&M cost containment; and (iii) excellent operations and safe work environment. The Compensation Committee selected the goals and individual weightings for the 2015 PEP to ensure an appropriate focus on profitable growth and expense control, as well as operational and customer service excellence. This use of balanced financial and operational metrics encourages all employees to work toward common goals that are in the interests of UNS Energy’s various stakeholders.
The program design includes a 50% maximum payment cap if the Net Income goal does not achieve at least Threshold attainment. This ensures sufficient income to fund the program and reiterates the importance of the Net Income Goal. Finally, the Board of Directors has discretion to adjust any payout.
The financial and other metrics for the Company’s 2015 Short-Term Incentive Compensation program were:
Financial – 60%, Comprising of:
Net Income – 40%
O&M Cost Containment – 20%
Excellent Operations and Safe Work Environment – 40%
In developing the PEP performance targets, Company management compiles relevant data such as Company historic performance and industry benchmarks and makes recommendations to the Compensation Committee for a particular year, but the Compensation Committee ultimately determines the performance objectives that are adopted.
The 2015 financial performance objectives were:
 Threshold Target Exceptional
Net Income (in millions) results interpolated
$139.6
 $150.1
 $160.6
O&M Long-Term Increase final results interpolated
3.0% 2.0% 1.5%
The 2015 operational and safety performance objectives were:
 Threshold Target Exceptional
Excellent Operations     
Equivalent Availability Factor (“EAF”) Generation Reliability – Summer92.43% 93.42% ≥94.42%
System Average Interruption Duration Index (“SAIDI”) Transmission/Distribution Reliability78-90 57-77 < 57
Customer Satisfaction - Improve Residential Customer Satisfaction Score Measured by JD Power640 - 649 650 - 669 ≥670
Safe Work Environment     
OSHA Rate (Employee Safety Incident Rate)1.70 1.50 < 1.00
2015 PEP Results
Summary:
Overall, the 2015 results produced a total weighted performance for all goals of 113.2% of target performance, as summarized in Table A below. The Compensation Committee approved an overall PEP payout of 113.2% of target awards.

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Table A: Summary of 2015 PEP Results
Goal
Weighting of
Goal (A)
 
Percentage of
Target Performance
Achieved (B) (1)
 
Payout Percentage
(A x B)
Net Income40% 108% 43.2%
Safe Work Environment10% 50% 5.0%
O&M Cost Containment20% 150% 30.0%
Excellent Operations30% Various 35.0%
 100%   113.2%
(1)
Additional details provided below.
Net Income Goal:
In 2015, the Company achieved $151.8 million of net income, which was above target performance (results are interpolated). Table B, below, reflects the net income goal, which ranged from $139.6 million (threshold) to $160.6 million (exceptional), and the corresponding payout levels, which ranged from 50% to 150% of the target award, as well as the actual net income achieved for 2015. Net income must have been more than $139.6 million to produce a payout. The achievement of $151.8 million in net income resulted in a payout level of 108.1% of the target amount for the Net Income performance objective.
Table B: Net Income
 Final Result: $151.8
(in millions)Range
 $139.6$141.7$143.8$145.9$148.0$150.1$152.2$154.3$156.4$158.5$160.6
Payout % of Target50%60%70%80%90%100%110%120%130%140%150%
 á    á    á
 Threshold   Target   Exceptional
     Actual $151.8    
O&M Cost Containment Goal:
Prior to 2015, the O&M cost containment goal focused on achieving a targeted current year O&M spending level. In 2015 the goal was changed to reflect a longer term view of O&M by focusing on results of the 2016 budget (set by management in mid-year 2015) as a percentage increase over the 2015 base O&M budget. The lower increase of year over year budget estimates represents better performance. This O&M goal is meant to trigger longer-term thinking on how the Company's leadership might structurally change its business and processes, using proven process improvement methods, to focus on moving the business forward while containing costs. In 2016, the program design will include a monitoring of performance to the established 2016 budget. Table C, below, reflects the O&M cost containment goal, which ranged from 3.0% increase (threshold) to 1.5% increase (exceptional), and the corresponding payout levels, which ranged from 50% to 150% of the target award (results are interpolated). In 2015 the Company achieved a 2016 O&M budget decrease of 0.5%, which was exceptional performance, and resulted in a payout level of 150% for that performance objective.
Table C: O & M Long Term Increase
 Final Result: 1.5%
(in millions)Range
 3.0%2.8%2.6%2.4%2.2%2.0%1.9%1.8%1.7%1.6%1.5%
Payout % of Target50%60%70%80%90%100%110%120%130%140%150%
 á    á    á
 Threshold   Target   Exceptional
          Actual (0.5)%
Excellent Operations Goals:
Equivalent Availability Factor (“EAF”): The reliability of the Company's plant performance during the peak summer demand season is critical to its customers and due to approved rate design, to financial performance; therefore, a Summer EAF goal is used in measuring the reliability of the Company's generation fleet.

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System Average Interruption Duration Index (“SAIDI”): This reliability measure in the Company's Transmission and Distribution business area is a good outage duration performance measure, because it tracks the length or duration of outages across all customers, giving the Company a focus on reducing the outage time a customer experiences.
Customer Satisfaction: This reliability metric is measured by the JD Power Customer Satisfaction survey. Improving the Company's interactions with customers is critical to the outcome of this goal.
Safe Work Environment Goal:
Safety: The Company's safety measure tracks the OSHA Recordable Incident Rate, which is a good indicator of a company’s safety efforts. Continued focus on safety initiative components (leadership, employee involvement, and regulatory compliance) is a priority for the Company.
Table D, below, reflects the final achievement at the various levels of performance for the Excellent Operations and Safe Work Environment goals. According to the guidelines set by the Compensation Committee, the achievement of these goals yielded a result of 40% for this combination of performance objectives.
Table D: Excellent Operations/Safe Work Environment Goals
 Weight Actual Result Final Value Totals
Excellent Operations (30% Weighting)
       
Equivalent Availability Factor (“EAF”) Generation Reliability – Summer10% Exceptional 15%  
System Average Interruption Duration Index (“SAIDI”) Transmission/Distribution Reliability10% Target 10%  
Customer Satisfaction - Improve Residential Customer Satisfaction Score Measured by JD Power10% Target 10%  
Subtotal: Excellent Operations      35.0%
Safe Work Environment (10% Weighting)
       
OSHA Rate (Employee Safety Measure)10% Threshold 5%  
Subtotal: Safe Work Environment      5.0%
Total Percentage for Excellent Operations and Safe Work Environment      40.0%
The Company’s internal audit department verified that the reported results for the 2015 PEP goals were accurate and reported its findings to the Compensation Committee.
The amounts of the 2015 PEP awards paid to each of the Named Executives are listed in the Summary Compensation Table below.
Long-Term Incentive Compensation (Equity Based Awards)
UNS Energy believes that equity-based awards align the interests of executive officers with the interests of Fortis’ shareholders and fosters the growth and success of the business of the Company and Fortis in accordance with the vision of both the Company and Fortis. In addition, the vesting provisions applicable to the awards encourages a focus on long-term operating performance, linking compensation expense to the achievement of multi-year financial results and helping to retain executive officers.
In 2015, the Compensation Committee approved the adoption of a new long-term incentive plan under which certain key employees, including executive officers, may be granted long-term incentive awards of performance-based share units ("PSUs") and time-based restricted share units ("RSUs"). Executive officers receive a cash payment for each PSU and RSU that is payable and vested pursuant to the plan. The payment is based on the market price of one share of common stock of Fortis on the applicable payment or vesting date, which is then converted to U.S. dollars in accordance with the plan. All prior long-term incentive awards that predate the current plan were paid out in 2014 as a result of the acquisition of UNS by Fortis.
The long-term incentive (“LTI”) opportunity for each Named Executive is based on a percentage of salary. The 2015 LTI multiples are 150% for Mr. Hutchens, 100% for Mr. Larson, and 40% for Ms. Kissinger and Messrs. Hixon and Grant. The dollar values of the Named Executives’ long-term incentives are generally in the 25th percentile to median range of the Peer Group. Under the design of the compensation plan for 2015, two-thirds of the award opportunity was granted as performance

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share units and one-third was to be granted as restricted share units that vest 100% on the third anniversary of grant to support retention objectives as well as succession planning initiatives.
2015 Performance Share Units
Performance share unit awards granted in 2015 will be distributed, along with dividend equivalents (to the extent that the performance share units become earned and vested), at the end of the three-year payment criteria period ending in 2017, based on the following equally-weighted payment criteria:
TSR Payment Criteria
The first financial performance criteria is the TSR of Fortis stock relative to the TSR of a predefined peer group (the "LTI Peer Group") shown below for the same period.
TSR Percentile RankPayout as a Percent of Target Award
75th percentile and above
75.0%
50th percentile
50.0%
30th percentile
25.0%
Below 30th percentile
0.0%
Intermediate payouts determined by interpolation.
LTI Peer Group
AGL ResourcesNiSource Inc.
Alliant EnergyNortheast Utilities
Ameren Corp.OGE Energy Corp.
Atmos Energy Corp.Pinnacle West Capital Corp.
Canadian Utilities, Ltd.PPL Corp.
CenterPoint Energy, Inc.Public Svc Enterprise Group
CMS Energy Corp.SCANA Corp.
DTE Energy Co.Sempra Energy
Emera, Inc.TECO Energy Inc.
Great Plains EnergyUGI Corp.
LTI Peer GroupWestar Energy, Inc.
MDU Resources Group Inc.Wisconsin Energy Corp.
New Jersey Resources, Corp.Xcel Energy Inc.
Cumulative Net Income Payment Criteria
The second financial payment criteria is cumulative net income (CNI) determined in accordance with GAAP and compared to a target cumulative net income of UNS Energy based on an assessment of external and management forecasts for the same period.
Degree of Performance Attainment (in millions)
Three-Year Cumulative
Net Income
 
Payout as a Percent of Target
Award Earned
Exceptional$527
 75.0%
Target457
 50.0%
Threshold387
 25.0%
Less than Threshold< 387
 0.0%
Intermediate payouts determined by interpolation.
Equity Grant Timing and Practice
During the first quarter following the close of a fiscal year, the Compensation Committee approves and grants the long-term incentive awards for that year, including the type of equity to be granted, as well as the size of the awards for Named

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Executives. In determining the type and aggregate size of awards to be provided, as well as the performance metrics that apply, the Compensation Committee considers the strategic goals of the Company and Fortis, trends in corporate governance, accounting impact, tax deductibility, cash flow considerations, and the impact on Fortis's earnings per share. The timing of awards was not coordinated with the release of material non-public information.
CLAWBACK PROVISION FOR VARIABLE COMPENSATION
Consistent with current “best practices,” short- and long-term incentive compensation awards are subject to clawback provisions. The clawback provision may apply to the income derived from the financial component of the PEP and the performance share units in the event of a restatement of financial results that, in the view of the Compensation Committee, results from fraud or intentional misconduct. The Compensation Committee has discretion to determine to whom the clawback will apply and the amount subject to clawback, if such repayment is determined to be necessary.
ELEMENTS OF POST EMPLOYMENT COMPENSATION
Termination and Change in Control
Prior to the Company's acquisition by Fortis, the Compensation Committee had determined that it was in the Company’s and shareholders’ best interest to enter into change in control agreements with its executive officers in order to attract highly qualified executives and to retain those executives through any future challenges that might arise. All of these agreements were designed to be consistent with contemporary “best practices,” such as double trigger severance payments and equity vesting and no excise tax gross-ups. These various agreements are still in effect and are discussed in detail in Potential Payments Upon Termination or Change in Control, below.
Generally speaking, the Company does not enter into or extend employment agreements with current officers and instead only uses employment agreements when needed in recruiting a new officer. The Company currently has no employment agreements in place.
UNS Energy also maintains a severance pay plan for all of the Company’s non-union employees, including its Named Executives, which continues the Company’s historical practice of providing severance pay in certain termination situations without a change in control and provides consistency in that practice.
Retirement and Other Benefits
The Company offers retirement and other core benefits to its employees, including the Named Executives, in order to provide them with a reasonable level of financial support in the event of illness or injury and to enhance productivity and job satisfaction. The basic retirement and other core benefits are the same for all employees and Named Executives and include medical and dental coverage, disability insurance and life insurance. In addition, the TEP 401(k) Plan (the “401(k) Plan”) and the TEP Salaried Employees Retirement Plan (the “Retirement Plan”) provide a reasonable level of retirement income reflecting employees’ careers with the Company. All employees, including Named Executives, participate in these plans; the cost of these benefits (other than the Retirement Plan) is partially borne by the employee, including each Named Executive. In addition, the Company provides all of its officers with an optional executive physical annually.
In addition to the basic retirement plans, described above, to the extent that any executive officer’s retirement benefit exceeds Internal Revenue Code (Code) limits for amounts that can be paid through a qualified plan, the Company also offers non-qualified retirement plans, including the TEP Excess Benefit Plan (Excess Benefit Plan) and the Management and Directors Deferred Compensation Plan (DCP). These plans provide only the difference between the calculated benefits and Code limits. These benefits are not tied to any formal individual or Company performance criteria but are intended to enhance the attraction and retention value of the executive officer compensation program and are consistent with similar competitive compensation benefits made available to executives in the industry. UNS Energy believes the DCP and the Excess Benefit Plan assist with the Company’s attraction and retention objectives. The DCP provides an industry-competitive and tax-efficient benefit to the executive officers. The DCP is not funded by the Company; DCP participants are unsecured creditors of the Company with respect to their DCP plan accounts. The Excess Benefit Plan provides the retirement benefits to executive officers that would have been provided under the Retirement Plan if the Code limitations did not apply. For more information on retirement and certain related benefits, see Pension Benefits and Non-Qualified Deferred Compensation, below.
ROLE OF EXECUTIVES IN ESTABLISHING COMPENSATION
Certain executive officers, including the CEO, the CFO, the General Counsel and the Vice President of Customer and Human Resources, routinely attend regular sessions of Compensation Committee meetings; however, they are excused for executive sessions when their compensation is discussed and/or determined. The CEO makes recommendations to the Compensation Committee with respect to changes in compensation for senior executive officer positions (other than the CEO) and payouts

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under the annual incentive plan. The CEO also makes suggestions to the Compensation Committee regarding the design of incentive plans and other programs in which senior management participates.
The CFO provides information regarding short-term and long-term compensation targets, as well as updates on the progress of short- and long-term objectives. Additional Company personnel with expertise in and responsibility for compensation and benefits provide information regarding executive officer and director compensation, including cash compensation, equity awards, pensions, deferred compensation and other related information.
COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION
The Compensation Committee has reviewed and discussed with management the Compensation Discussion and Analysis section required by Items 401, 405, 406 and 407 (c)(3), (d)(4) and (d)(5)Item 402(b) of SEC Regulation S-K willand contained in this annual report. Based on such review and discussions, the Compensation Committee recommended to the Board of Directors of TEP that the Compensation Discussion and Analysis section be included in UNS Energy’s Proxy Statement relating toTEP’s annual report on Form 10-K for the 2014 Annual Meeting of Shareholders, which will be filed withyear ended December 31, 2015.
Respectfully submitted,
THE HUMAN RESOURCES AND GOVERNANCE COMMITTEE OF UNS ENERGY CORPORATION
Louise L. Francesconi, Chair
Lawrence J. Aldrich
Robert A. Elliott
Barry Perry



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SUMMARY COMPENSATION TABLE – 2015 (1)
The following table sets forth summary compensation information for the SEC not later than 120 days afteryears ended December 31, 2013, which information is incorporated herein by reference.2014, and 2015 for the Company’s Named Executives:
Name and Principal PositionYear Salary 
Share Awards(2)
 
Non-Equity Incentive Plan Compensation(3)
 
Change in Pension Value and Non-Qualified Deferred Compensation Earnings(4)
 
All Other Compensation(5)(6)
 Total
David G. Hutchens
President and Chief Executive Officer
2015 446,942
 632,590
 432,815
 393,142
 9,647
 1,915,136
2014 397,962
 417,359
 377,827
 555,358
 2,529,306
 4,277,812
2013 306,482
 432,998
 198,513
 105,379
 14,209
 1,057,580
Kevin P. Larson
Senior Vice President and Chief Financial Officer
2015 297,995
 280,509
 169,081
 
 9,647
 757,232
2014 289,922
 286,845
 158,639
 259,605
 4,122,921
 5,117,932
2013 279,435
 327,989
 142,107
 46,725
 12,574
 808,831
Todd C. Hixon
Vice President and General Counsel
2015 231,135
 85,736
 111,642
 32,676
 9,647
 470,836
2014 226,742
 86,054
 96,072
 242,704
 460,900
 1,112,472
Karen G. Kissinger
Vice President and Chief
Compliance Officer
2015 221,580
 83,223
 100,316
 36,250
 9,647
 451,016
2014 219,094
 86,054
 95,088
 325,958
 2,272,033
 2,998,227
2013 216,627
 252,798
 107,659
 
 10,147
 587,230
Kentton C. Grant
Vice President and
Treasurer
2015 212,349
 78,884
 100,316
 87,403
 7,645
 486,597
(1)
The amounts included in the Summary Compensation Table represent only the amounts paid by UNS for services to TEP and its subsidiaries and do not include amounts paid by UNS for services to others. For 2015 services, 80.90% of the amounts paid by UNS were allocable to services to TEP and its subsidiaries. For 2014 services, 80.46% of the amounts paid by UNS were allocable to services to TEP and its subsidiaries. For 2013 services, 79.7% of the amounts paid by UNS were allocable to services to TEP and its subsidiaries.
(2)
The amounts included in the Share Awards column reflect 80.90% of the grant date fair value calculated in accordance with FASB ASC Topic 718 for restricted share units and performance share units granted in each of the years reported, excluding the effect of forfeitures. Half of the performance share unit awards had a grant date fair value, based on a Monte Carlo simulation, of $36.28 per share. These awards are based on Fortis's Shareholder Return relative to the Peer Group TSR for the three year performance period ended December 31, 2017. The remaining half had a grant date fair value, based on the grant date closing price, of $33.47 per share based on cumulative net income for the performance period ended December 31, 2017. The restricted share units had a grant date fair value, based on the grant date closing price, of $33.47 per share. The share prices listed in this footnote are converted from Canadian Dollars (CAD) based on the Wall Street Journal currency exchange rate on the grant date (12/31/14) as required in the Share Unit Plan document which was 1.1621. The restricted share units vest on the third anniversary of grant over the vesting period. In the case of performance share units, the amounts in the column reflect the grant date fair value assuming the probable outcome of the performance conditions. The 2015 amounts attributable to Restricted Share Units and Performance Share Units are shown on the following table:
 Restricted Share Units Performance Share Units Total
David G. Hutchens224,979
 407,611
 632,590
Kevin P. Larson99,762
 180,747
 280,509
Todd C. Hixon30,492
 55,244
 85,736
Karen G. Kissinger29,598
 53,625
 83,223
Kentton C. Grant28,055
 50,829
 78,884

For the 2015 performance share grant, if the maximum level of performance is achieved and using [the fair market value of a share of Company common stock on the grant date ($36.28)], then the value of the payouts would be: $703,283 for David G. Hutchens, $311,855 for Kevin P. Larson, $95,317 for Todd C. Hixon, $92,524 for Karen G. Kissinger, and $87,699 for Kentton C. Grant.



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(3)
The 2015 PEP awards included in this column were paid in the first quarter of 2016 to each of the Named Executives.
(4)
Any increase in the present value of the accrued benefit in the Retirement Plan and Excess Benefit Plan is reported in this column. All named executives experienced an increase in the present value of their respective accrued pension benefits during 2015. The present value of accumulated benefits payable is reflected in Pension Benefits, below. UNS Energy does not pay “above market” interest on non-qualified deferred compensation; therefore, this column reflects change in pension value only. See Non-qualified Deferred Compensation, below.
(5)
The amounts in the All Other Compensation for 2015 column contain only Qualified 401 (k) Plan Matching Contributions.
(6)
The amounts in the All Other Compensation column for 2014 include payments in exchange for stock awards canceled in connection with the acquisition of UNS Energy by Fortis in 2014.
ITEM 11.GRANTS OF PLAN-BASED AWARDSEXECUTIVE2015
The following table sets forth information regarding plan-based awards by UNS to the Company’s Named Executives in 2015 on account of services to TEP and its subsidiaries. As described above, 80.90% of the amount paid by UNS on account of services in 2015 is allocable to services to TEP and its subsidiaries. The compensation plans under which the grants in the following table were made are generally described in Compensation Discussion and Analysis, above and include the PEP, which provides for non-equity (cash) performance awards, and the 2015 Share Unit Plan, which provides for equity-based performance awards including restricted share units and performance share units.
 Grant Date 
Estimated Possible Payouts 
Under Non-Equity
 Incentive Plan Awards(1)
 
Estimated Future Payouts Under
Equity Incentive Plan Awards (#) (2)
 
All Other Stock Awards: Number of Shares of Stock or Units (#) (3)
 
Grant
Date
Fair
Value
of
Stock
and
Option
Awards(4)
Name  Threshold Target Maximum Threshold Target Maximum    
DAVID H. HUTCHENS                
PEP1/1/2015 $179,986
 $359,973
 $539,959
          
Performance Share Units1/1/2015       6,721
 13,442
 20,164
   $407,611
Restricted Share Units1/1/2015             6,721
 224,979
KEVIN P. LARSON                
PEP1/1/2015 74,837
 149,675
 224,512
          
Performance Share Units1/1/2015       2,980
 5,961
 8,941
   180,747
Restricted Share Units1/1/2015             2,980
 99,762
TODD C. HIXON                
PEP1/1/2015 45,766
 91,531
 137,297
          
Performance Share Units1/1/2015       911
 1,822
 2,733
   55,244
Restricted Share Units1/1/2015             911
 30,492
KAREN G. KISSINGER                
PEP1/1/2015 44,417
 88,835
 133,253
          
Performance Share Units1/1/2015       884
 1,768
 2,653
   53,625
Restricted Share Units1/1/2015             884
 29,598
KENTTON C. GRANT                
PEP1/1/2015 43,686
 87,372
 131,058
          
Performance Share Units1/1/2015       838
 1,676
 2,514
   50,829
Restricted Share Units1/1/2015             838
 28,055
(1)
The amounts shown in this column reflect the range of payouts (50%-150% of the target award) for 2015 performance under the PEP, as described in Compensation Discussion and Analysis - Short-Term Incentive Compensation, above. These amounts are based on the

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individual’s current salary and position. The amount of cash incentive actually paid under the PEP for 2015 is reflected in the Summary Compensation Table above.
(2)
The amounts shown in this column reflect the range (50%-150% of the target award) of payouts in the form of performance share units targeted for 2015-2017 performance under the 2015 Share Unit Plan for long-term incentive compensation, as described in the “Long-Term Incentive Compensation” section of the CD&A, above.
The target 2015 LTI multiples, as a percentage of base salary, are 150% for Mr. Hutchens, 100% for Mr. Larson, and 40% each for Ms. Kissinger and for Messrs. Hixon and Grant. Accordingly, each Named Executive received an LTIP target award of performance share units and restricted share units the total value of which was equal to the executive’s base salary multiplied by the applicable multiple (e.g., 100% for CFO), divided by the grant date fair market value of a share of Fortis's common stock ($33.47), rounded down to the nearest 1 share. The share prices listed in this footnote are converted from Canadian Dollars (CAD) based on the Wall Street Journal currency exchange rate on the grant date (12/31/14) as required in the Share Unit Plan document which was 1.1621. For example, the CFO's 2015 base salary attributable to TEP (and LTIP target award) was $299,349, divided by $33.47, and rounded down to the nearest 1 share, resulted in an LTIP target award of 5,961 performance share units and 2,980 restricted share units.
The 2015 awards of performance share units will be paid in cash at the end of the performance period depending on the Company’s performance relative to the two performance criteria described in Compensation Discussion and Analysis, above. The two performance criteria operate independently; a Named Executive may receive a payment on account of one of the criteria without regard to performance on the other criteria.
(3)
The amounts shown in this column represent the number of time-based restricted share units that were granted in 2015 under the 2015 Share Unit Plan and will be paid in cash at the end of the vesting period.
(4)
The amounts included in this column reflect 80.90% of the grant date fair value calculated in accordance with FASB ASC Topic 718 for restricted share units and performance share units granted in each of the years reported, excluding the effect of forfeitures. Half of the performance share unit awards had a grant date fair value, based on a Monte Carlo simulation, of $36.28 per share. These awards are based on Fortis's Shareholder Return relative to the Peer Group TSR for the three year performance period ended December 31, 2017. The remaining half had a grant date fair value, based on the grant date closing price, of $33.47 per share based on cumulative net income for the performance period ended December 31, 2017. The restricted share units had a grant date fair value, based on the grant date closing price, of $33.47 per share. The share prices listed in this footnote are converted from Canadian Dollars (CAD) based on the Wall Street Journal currency exchange rate on the grant date (12/31/14) as required in the Share Unit Plan document which was 1.1621. The restricted share units vest on the third anniversary of grant over the vesting period. In the case of performance share units, the amounts in the column reflect the grant date fair value assuming the probable outcome of the performance conditions. For more information about these awards, please refer to footnote 1 of the Summary Compensation Table and Compensation Discussion and Analysis, above.
OUTSTANDING EQUITY AWARDS AT FISCAL YEAR END - 2015
 Stock Based Awards
Grant Date 
Number of Shares or Units of Stock That Have Not Vested(1)
(#)
 
Market Value of Number of Shares or Units of Stock That Have Not Vested (2)
($)
 
Equity Incentive Plan Awards: Number of Unearned Shares, Units or Other Rights That Have Not Vested (3)
(#)
 
Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares, Units or Other Rights That Have Not Vested (4)
($)
David G. Hutchens1/1/2015 6,721
 $218,176 13,442
 $436,352
Kevin P. Larson1/1/2015 2,980
 96,745
 5,961
 193,490
Todd C. Hixon1/1/2015 911
 29,570
 1,822
 59,140
Karen G. Kissinger1/1/2015 884
 28,703
 1,768
 57,406
Kentton C. Grant1/1/2015 838
 27,206
 1,676
 54,413
(1)
Number of time-based restricted share units that remain unvested as of December 31, 2015. Restricted share units vest on the third anniversary of the grant date, subject to continued service with the Company through that date.
(2)
The market value of restricted share units and performance share units was calculated by multiplying the number of restricted share units outstanding or the number of performance share units (as determined in accordance with the Securities and Exchange Commission, or SEC, rules and footnote 5 below), as applicable, by $32.46 which was the share price as of 12/31/15. The share prices listed in this footnote are converted from Canadian Dollars (CAD) based on the Wall Street Journal currency exchange rate on the grant date (12/31/14) as required in the Share Unit Plan document which was 1.1621.
(3)
Performance share units vest, if at all, after three years based on the achievement of performance of the cumulative goals over the applicable three-year period. The performance goals are described in the CD&A.

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(4)
The amounts for the 2015 performance share unit awards are shown at the target level based on the results for the first year of the 2015-2017 performance period.
OPTION EXERCISES AND STOCK VESTED
There were no stock options exercised or stock or share awards vested during the year ended December 31, 2015.
PENSION BENEFITS
The following table shows 80.90% of the present value of accumulated benefits payable to each of the Named Executives, including the number of years of service credited to each such Named Executive, under each of the Retirement Plan and the Excess Benefit Plan determined using interest rate and mortality rate assumptions used in the Company’s financial statements. See Note 8 of Notes to Consolidated Financial Statements in Item 8 of this Form 10-K and the Retirement and Other Benefits, above for information regarding the Retirement Plan and the Excess Benefit Plan.
 Plan Name 
Number of Years
Credited Service
 
Present Value of
Accumulated Benefit
 
Payments During Last
Fiscal Year
David G. Hutchens
Tucson Electric Power
Salaried Employees
Retirement Plan(1)(3)
 20.50 $763,775
 
 
Tucson Electric Power
Excess Benefit Plan(2)(3)
 20.50 1,192,238
 
Kevin P. Larson
Tucson Electric Power
Salaried Employees
Retirement Plan(1)(3)
 30.83 1,272,805
 
 
Tucson Electric Power
Excess Benefit Plan(2)(3)
 30.83 1,366,778
 
Karen G. Kissinger
Tucson Electric Power
Salaried Employees
Retirement Plan(1)(3)
 25 1,283,649
 
 
Tucson Electric Power
Excess Benefit Plan(2)(3)
 25 662,945
 
Todd C. Hixon
Tucson Electric Power
Salaried Employees
Retirement Plan(1)(3)
 17.58 495,203
 
 
Tucson Electric Power
Excess Benefit Plan(2)(3)
 17.58 194,627
 
Kentton C. Grant
Tucson Electric Power
Salaried Employees
Retirement Plan(1)(3)
 20.08 725,334
 
 
Tucson Electric Power
Excess Benefit Plan(2)(3)
 20.08 293,561
 
(1)
The Retirement Plan is intended to meet the requirements of a qualified benefit plan for Code purposes and is funded by the Company and made available to all eligible employees. The Retirement Plan provides an annual income upon retirement based on the following formula:
1.6% x years of service (up to 25 years) x final average pay
Final average pay is calculated as the average of basic monthly earnings on the first of the month following the employee’s birthday during the five consecutive plan years in which basic monthly earnings were the highest, within the last 15 plan years before retirement. Basic monthly earnings means the monthly base salary prior to any reduction for contributions to a Code section 401(k) plan, but excluding overtime pay, bonuses or other compensation. Years of service are based on years and months of employment. A Retirement Plan participant vests in his or her retirement benefit after five years of service. The maximum benefit available under the Retirement Plan is an annual income of 40% of final average pay (as defined above). Plan compensation for purposes of determining final average pay is limited by compensation limits under Code Section 401(a)(17). For 2015, the limit was $265,000 in annual income. Employees are eligible to retire early with an unreduced pension benefit if (i) the combination of their age and years of service equals or exceeds 85, or (ii) they are age 62 and have completed 10 years of service. Employees are also eligible for early retirement with a reduced pension benefit at age 55 with at least 10 years of service. The reduction at age 55 with 10 years of service is 42.6% and continues to be reduced at a lesser amount up to age 62, at which point there is no

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reduction. All optional forms of the benefit are actuarially equivalent. Messrs. Larson and Grant and Ms. Kissinger are currently eligible for early retirement.
(2)
The Retirement Plan is subject to Code limitations on the amount of compensation that can be taken into account and on the amount of benefits that can be provided. The Excess Benefit Plan provides the retirement benefits to executive officers that would have been provided under the Retirement Plan if the Code limitations did not apply. The Excess Benefit Plan retirement benefit is calculated generally using the same pension formula as the Retirement Plan formula but with some modifications. Compensation for purposes of the Excess Benefit Plan is determined without regard to Code limits on compensation and by including voluntary salary reductions to the DCP and any annual incentive payment received under the PEP. The retirement benefit payable from the Excess Benefit Plan is reduced by the benefit payable to that person from the Retirement Plan. Vesting occurs after five years of service. Benefits are payable in a lump sum or annuity, at the participant’s election. Messrs. Larson and Grant and Ms. Kissinger are currently eligible for early retirement.
(3)
In preparing the aggregate increase in actuarial value of the above plans, the following assumptions and methods were used:
Measurements were made as of Tucson Electric Power Company's ASC 715 measurement date of December 31, 2015.
December 31, 2015 calculations were done using the spot rates underlying the Rate:Link 60-90 Yield Curve as of December 31, 2015 and RP-2014 mortality table, projecting mortality generationally at Scale MP-2015, with the following adjustments:
The RP-2014 mortality table was adjusted to back out MP-2014 experience to 2006, then add back in MP-2015 through 2015.
The MP-2015 projection scale was adjusted so that the ultimate rate of 1% at age 85 was reduced to 0.75%.
The MP-2015 projection scale was further adjusted to reduce the convergence period to 15 years, rather than 20.
No pre-retirement mortality was assumed. For measurements at December 31, 2014, a discount rate of 4.10% and RP-2000 Female with generational projection using scale BB Female for females and RP-2000 Male with generational projection using scale BB Male for males, and both with no pre-retirement mortality were used for the Salaried and Excess Plans. This discount rate reflects rates as of December 31, 2015.
All participants were assumed to elect a 10 year Certain and Life benefit at the earliest age at which they are projected to be eligible for unreduced benefits.
NON-QUALIFIED DEFERRED COMPENSATION
Information concerning ExecutiveUNS Energy sponsors the DCP for directors, executive officers and certain other employees of UNS Energy. Under the DCP, employee participants are allowed to defer on a pre-tax basis up to 100% of base salary and cash bonuses, and non-employee director participants are allowed to defer up to 100% of their cash compensation. The deferred amounts are valued daily as if invested in one or more of a number of investment funds, including UNS Energy share units, each of which may appreciate or depreciate in value over time. The choice of investment funds is determined by the individual participant. The amounts shown in the table below represent 80.90% of the total amounts, to reflect the portion allocable to TEP and its subsidiaries.
 
Executive
Contributions
in Last Fiscal
Year (1)
 
Aggregate
Earnings in
Last Fiscal
Year (2)
 
Aggregate
Withdrawals/
Distributions
 
Aggregate
Balance at
Last Fiscal
Year End (3)
David G. Hutchens
 
 
 
Kevin P. Larson
 8
 
 54,372
Todd C. Hixon
 
 
 
Karen G. Kissinger
 19
 
 122,451
Kentton C. Grant42,470
 11
 
 83,181
(1)
Represents contributions to the DCP by the Named Executives during the year. The amounts shown, if any, are included in the salary column of the Summary Compensation Table, above.

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(2)
Represents the total market based earnings (losses) for the year on all deferred compensation under the DCP based on the investment returns associated with the investment choices made by the Named Executive. Amounts in this column are not included in the Summary Compensation Table.
(3)
The aggregate balance includes compensation that was previously earned and reported in the Summary Compensation Table for 2013 and 2014 (if any) as follows: Mr. Larson—$8,817 and Ms. Kissinger—$1,287. Benefits under the plan will be distributed on the first to occur of the following events: separation from service, disability or death, in the form of either a lump sum or installment payments. The following table shows the deemed investment options available under the DCP and the annual rate of return for the calendar year ended December 31, 2015.
Name of Fund Rate of Return Name of Fund Rate of Return
Fidelity Retirement Money Market 0.02% Fidelity Spartan Us Equity Index 1.35%
Fidelity Intermediate Bond 0.68% Fidelity Growth Company 7.94%
Janus Flexible Bond 0.09% Fidelity Low Price Stock (0.45)%
Fidelity Asset Manager (0.44)% Janus Worldwide (2.30)%
Fidelity Equity-Income (3.41)% T. Rowe Price Blue Chip Growth 11.15%
Fidelity Managed Income 1.17% Fidelity Diversified International K 3.24%
RS Value Y (5.99)% Franklin Utilities A (7.38)%
American Beacon Small Cap Value Instl (5.04)% Allianz NFJ International Value Instl (13.15)%
Fidelity Small Cap Stock 2.40%    
POTENTIAL PAYMENTS UPON TERMINATION OR CHANGE IN CONTROL
In order to ensure that the Company is able to retain its Named Executives, the Compensation Committee has determined that it is in the best interest of the Company and its shareholders to enter into change in control agreements with those Named Executives, as well as to maintain a severance pay plan for all of the Company’s non-union employees, including the Named Executives.
Change in Control Agreements
Each of our current executive officers, including our named executive officers who are currently employed by the Company, is party to a change in control agreement with UNS Energy entered into prior to the acquisition by Fortis. Under the change in control agreements, the executive officer will be containedentitled to receive change in control benefits if he or she incurs a separation from service due to the Company’s termination of his or her employment without “Cause” or due to the executive officer’s termination of employment with the Company for “Good Reason” during the six-month period prior to the occurrence of a Change in Control and if the executive officer’s separation from service is effected in contemplation of such Change in Control. The executive officer also will be entitled to receive these benefits if he or she incurs a separation from service due to the Company’s termination of his or her employment without Cause or due to the executive officer’s termination of employment for Good Reason during the 24-month period following the occurrence of a Change in Control.
A Change in Control is defined as: (i) the acquisition of beneficial ownership of 40% of the common stock of UNS Energy; (ii) certain changes in the Board; (iii) the closing of certain mergers or consolidations; or (iv) certain transfers of the assets of UNS Energy. Notwithstanding the foregoing, a Change in Control will not be deemed to have occurred until: any required regulatory approval, including any final non-appealable regulatory order, has been obtained; and the transaction that would otherwise be considered a Change in Control closes.
A Change in Control with UNS Energy occurred on August 15, 2014, the time of the acquisition of UNS Energy by Fortis. The protection period ends on August 13, 2016. Since there was a Change in Control, if a qualifying separation occurs on or before August 13, 2016, then the executive officer will be entitled to severance benefits in the form of: (i) a single lump sum payment in an amount equal to two (for Mr. Hutchens), one and one-half (for Mr. Larson) or one (for Ms. Kissinger and Messrs. Hixon and Grant) times the greater of (a) the executive officer’s annualized base salary as of the date of the executive officer’s separation from service, or (b) the executive officer’s annualized base salary in effect immediately prior to any material diminution in the executive officer’s base salary following execution of the change in control agreement; (ii) a single lump sum cash payment in an amount equal to two (for Mr. Hutchens), one and one-half (for Mr. Larson) or one (for Ms. Kissinger and Messrs. Hixon and Grant) times the average payment to which the executive officer was entitled pursuant to the short-term incentive compensation plan for the three calendar years immediately preceding the calendar year in which the executive officer’s separation from service occurs or, if that data is not available, the executive officer’s target payment under the short-term incentive compensation plan; (iii) a single lump sum cash payment in an amount equal to a prorated portion of the actual payment to which the executive officer would have been entitled under the short-term incentive compensation plan for the

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calendar year in which the executive officer’s separation from service occurs; and (iv) a single lump sum cash payment in the amount of the payment, if any, to which the executive officer is entitled under the short-term incentive compensation plan (based on the executive officer’s actual performance) for the year prior to the year in which the executive officer’s separation from service occurs, to the extent not already paid to the executive officer. “Good reason” is defined under these agreements to mean: (i) a material, adverse diminution in the executive officer’s authority, duties or responsibilities; (ii) a material change in the geographic location at which the executive officer must primarily perform services; (iii) a material diminution in the executive officer’s base salary provided that such diminution is not a result of a generally applicable reduction in the base salary of all officers of the Company in an amount that does not exceed 10%; or (iv) any action or inaction that constitutes a material breach of the agreement by the Company. “Cause” is defined under these agreements to mean: (i) the willful failure of the executive officer to perform any of the executive officer’s duties for the Company which continues after the Company has given the executive written notice describing the failure and an opportunity to cure the failure; (ii) a material violation of Company policy; (iii) any act of fraud or dishonesty; (iv) the executive officer’s gross misconduct in the performance of the executive officer’s duties that results in material economic harm to the Company; (v) the executive officer’s conviction of, or plea of guilty or no contest, to a felony; or (vi) the executive officer’s material breach of the executive officer’s employment agreement with the Company, if any.
The executive officer would also be entitled to continue to participate in TEP’s health, life, disability or other insurance benefit plans for a period expiring on the earlier of (a) 24 months (for Mr. Hutchens), 18 months (for Mr. Larson), or 12 months (for Ms. Kissinger and Messrs. Hixon and Grant) following the executive officer’s separation from service, or in some cases for the respective period following the Change in Control event, or (b) the day on which the executive officer becomes eligible to receive any substantially similar benefits, on a benefit-by-benefit basis, under any plan or program of any successor employer. In the event the executive officer elected a high deductible health care plan pursuant to which TEP has agreed to make contributions to the executive officer’s health savings account, then TEP will pay to the executive officer a single lump sum cash payment in an amount equal to the contributions that TEP would have made to the executive officer’s health savings account during the respective benefit continuation period described above had the executive officer not incurred the separation from service.
The Change in Control Agreements provide that the executive officer shall be employed by UNS Energy or one of its subsidiaries or affiliates, in a position comparable to the current position, with base compensation and benefits at least equal to the then-current compensation and benefits, for an employment period of two years after a Change in Control (subject to earlier termination for cause or the executive officer’s termination without good reason).
The Change in Control Agreements also contain a number of material conditions or obligations applicable to the receipt of payments or benefits, which require the executive officer to: (i) continue to abide by the terms and provisions of the Company’s policies that protect various forms of confidential information and intellectual property; (ii) refrain from consulting with, engaging in or acting as an advisor to another company about business that competes with the Company; (iii) refrain from soliciting business for or in connection with any competing business (a) from any individual or entity that obtained products or services from the Company at any time during the executive officer’s employment with the Company or (b) from any individual or entity that was solicited by the executive officer on behalf of the Company; and (iv) refrain from soliciting employees of the Company who would have the skills and knowledge necessary to enable or assist efforts by the executive officer to engage in a competing business. Item (i) referred to in this paragraph contains no durational limit, nor do the Change in Control Agreements include any provision providing for waiver of a breach of item (i). Items (ii) through (iv) referred to in this paragraph are effective for a period of one year following the date of the executive officer’s termination. Breach of items (ii) through (iv) is waived if the Company materially defaults on any of its obligations under the Change in Control Agreements.
No excise tax gross-ups are provided. Rather, severance payments to executives are cut back to the safe harbor limit if the reduction results in the executive receiving a greater after-tax benefit than if the excise tax were paid by the executive on the excess parachute payments; otherwise, all payments would be paid and the executive would pay the excise tax.
All long-term incentive awards contain a double trigger vesting provision, which provides for accelerated vesting only if outstanding awards are not assumed by an acquirer and also provide for accelerated vesting upon a qualifying termination following a Change in Control. This double trigger vesting provision applies to future awards and/or if the Named Executive is terminated without cause within 24 months of a Change in Control. The double trigger, which is viewed as a corporate governance “best practice,” ensures that the Named Executives do not receive accelerated benefits unless they are adversely affected by the Change in Control.
On May 2, 2014, Mr. Hutchens was appointed CEO of UNS Energy and TEP in addition to his duties as President and Chief Operating Officer of each company. Incident to the appointment, Mr. Hutchens's Change in Control agreement was modified to increase the benefits to which he will be entitled if his employment is terminated by UNS Energy without cause or by Mr.

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Hutchens with good reason following a change in control and to provide that he was not entitled to terminate employment and receive the benefits provided by his Change in Control Agreement solely for the reason that he would no longer be CEO of a publicly traded company as a result of the acquisition of UNS Energy by Fortis.
On November 13, 2014, UNS Energy and Mr. Larson entered into a retention bonus agreement, the terms of which were approved by the UNS Energy Human Resources and Governance Committee. The retention bonus agreement amends Mr. Larson's change in control agreement to provide that changes in Mr. Larson's responsibilities that occurred as a result of the acquisition of UNS Energy by Fortis, or that may occur for succession purposes based on a future mutually-agreed transition process, shall not constitute good reason for Mr. Larson to terminate his employment and receive benefits under the change in control agreement.
Severance Pay Plan
In addition, the Company has a severance pay plan (Severance Plan) for all of the Company’s non-union employees, including its Named Executives, which provides for severance benefits in the event of a qualifying termination, which means a termination without cause without a change in control. Cause for termination under the Severance Plan means: (i) the willful failure of the employee to perform any of the employee’s duties for the employer which continues after the employer has given the participant written notice describing the failure and an opportunity to cure the failure; (ii) a material violation of Company policy; (iii) any act of fraud or dishonesty; (iv) willful failure to report to work for three days or to report to work on the agreed-upon date after a scheduled leave; or (v) willfully engaging in conduct that is demonstrably and materially injurious to the Company or any affiliate, monetarily or otherwise, including acts of fraud, misappropriation, violence or embezzlement for personal gain at the expense of the Company or any affiliate, conviction of (or plea of guilty or no contest or its equivalent to) a felony, or a misdemeanor involving immoral acts.
In the event of a qualifying termination, the Named Executive would be entitled to: (i) a cash severance payment equal to a multiple of base salary (two times for Mr. Hutchens, one and one-half times for Mr. Larson, and one time for Ms. Kissinger and Messrs. Hixon and Grant; (ii) continued subsidy of the premiums for COBRA medical, dental and vision coverage at the same rate as that paid by the Company prior to the separation from service for a period of the lesser of (a) 12 months, or (b) the date when the Named Executive becomes eligible for comparable benefits offered by a subsequent employer; and (iii) a portion of the amount to which the Named Executive would have been entitled under the Company’s PEP or any successor plan, based on the executive’s target payment for the year in which the executive’s separation from service occurs, had the Named Executive not incurred a separation from service. Receipt of benefits under the Severance Plan is contingent upon execution of a release of claims against the Company and subject to compliance with restrictive covenants, including perpetual confidentiality and non-disparagement provisions, and non-compete and non-solicitation requirements effective for the applicable severance period (two years for Mr. Hutchens, one and one-half years for Mr. Larson, and one year for Ms. Kissinger and Messrs. Hixon and Grant). Duplication of benefits provided under the Severance Plan is not permitted, and benefits payable under the Severance Plan cease in the event the Named Executive becomes eligible for change in control severance benefits or if the Named Executive has an employment agreement that provides for severance benefits.
In the event a Named Executive becomes eligible to receive severance benefits under the Severance Plan and has elected a health care option pursuant to which the Company has agreed to make pre-tax contributions to the Named Executive’s Health Savings Account, then the Company will pay the Named Executive an amount equal to the contributions the Company would have made to the Named Executive’s health savings account during the twelve-month period immediately following the Named Executive’s separation from service, plus a tax allowance in an amount equal to the federal, state and local taxes imposed on the Named Executive with respect to such contributions and with respect to the tax allowance. While as a general matter the Company does not provide tax gross-ups for severance arrangements or other benefits, it was deemed appropriate in this very limited circumstance because: (i) this particular type of benefit would be provided pre-tax, if the individual were still employed; (ii) the amounts in question are exceptionally small; and (iii) this treatment is available to all unclassified employees, not just the Named Executives, who become entitled to severance benefits under the Severance Plan and participate in the type of health care option described in the paragraph above.
Other than the agreements described above, UNS Energy has not entered into any severance agreements or employment agreements with any Named Executives.

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The following table and summary set forth potential payments payable to the Named Executives upon termination of employment or a Change in Control assuming their employment was terminated on December 31, 2015.
 
If Retirement or
Voluntary
Termination
Occurs (1)
 
If “Change In 
Control” and Qualifying
Termination Occurs(2)
 
If Death or
Disability
Occurs(3)
 
If “Non-
Change In
Control”
Termination
Occurs(4)
David G. Hutchens$
 $2,428,415
 $
 $2,428,415
Kevin P. Larson
 1,108,825
 
 1,108,825
Todd C. Hixon
 495,409
 
 430,778
Karen G. Kissinger
 512,354
 
 512,354
Kentton C. Grant  475,837
   475,837
(1)
In the event of retirement or voluntary termination, each of the Named Executives would be entitled to receive vested and accrued benefits payable from the Retirement Plan and the Excess Benefit Plan, but no form or amount of any such payment would be increased or otherwise enhanced nor would vesting be accelerated with respect to such plans. In addition, no accelerated vesting of options, restricted share units or performance share units would occur. Retirement Plan and Excess Benefit Plan information for the Named Executives is set forth in the Pension Benefits Table above.
(2)
The amounts shown represent the following:
 Cash 
Prorated
Non-equity
Incentive Award
 Restricted Share Units Performance Share Units 
Medical
Benefits
 Total
David G. Hutchens$1,380,088
 $359,973
 $218,176
 $436,352
 $33,826
 $2,428,415
Kevin P. Larson666,826
 149,675
 96,745
 193,490
 2,089
 1,108,825
Todd C. Hixon309,539
 91,531
 29,570
 59,140
 5,629
 495,409
Karen G. Kissinger318,060
 88,835
 28,703
 57,406
 19,350
 512,354
Kentton C. Grant294,529
 87,372
 27,206
 54,413
 12,317
 475,837
Amounts shown in the column headed Prorated Non-equity Incentive Award above represent the total "target" PEP award for 2015.
(3)
In the event of death, the Named Executive’s survivor would be entitled to receive a survivor annuity from the Retirement Plan and Excess Benefit Plan. The amount payable to the survivor would be less than the amount that would otherwise have been payable to the Named Executive had the Named Executive survived and received retirement benefits under the Retirement Plan and Excess Benefit Plan. There would be no enhancements as to form, amount or vesting of such benefits in the event of a Named Executive’s death.
(4)
This column reflects the amounts payable to the Named Executives in the event of an involuntary termination without cause or a resignation for good reason, as of December 31, 2015, under the Severance Plan. The amounts shown represent the following:
 Cash 
Pro-Rated
Non-equity
Incentive
Award
 Restricted Share Units Performance Share Units 
Medical
Benefits
 Total
David G. Hutchens$1,380,088
 $359,973
 $218,176
 $436,352
 $33,826
 $2,428,415
Kevin P. Larson666,826
 149,675
 96,745
 193,490
 2,089
 1,108,825
Todd C. Hixon244,908
 91,531
 29,570
 59,140
 5,629
 430,778
Karen G. Kissinger318,060
 88,835
 28,703
 57,406
 19,350
 512,354
Kentton C. Grant294,529
 87,372
 27,206
 54,413
 12,317
 475,837
Director Compensation
All TEP directors are also named executive officers of TEP and received no additional compensation for services as a director. All of their compensation is reflected in the Summary Compensation Table, above.
Compensation Committee Interlocks and Insider Participation
All members of the UNS Energy Human Resources and Governance Committee during fiscal year 2015 were independent directors, except for Mr. Perry, who is an executive officer of Fortis. No Human Resources and Governance Committee member

114


had any relationship requiring disclosure under Transactions with Related Persons, in Part III, Item 13. Certain Relationships and Related Transactions and Director Independence, below. During fiscal year 2015, none of the Company’s executive officers served on the Human Resources and Governance Committee or the Board of Directors of another entity whose executive officer(s) served on UNS Energy’s Proxy Statement relating toHuman Resources and Governance Committee, any other board committee, or the 2014 Annual MeetingBoard of Shareholders, which will be filed with the SEC not later than 120 days after December 31, 2013, which information is incorporated herein by reference.

Directors of UNS Energy or TEP as a whole.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS
General
At February 14, 2014, UNS Energy had outstanding 41,633,535 million shares of Common Stock. At February 14, 2014, the number of shares of Common Stock beneficially owned by all directors and officers of UNS Energy as a group amounted to 0.7% of the outstanding Common Stock.
At February 14, 2014, UNS Energy owned 100%All of the outstanding shares of common stock, no par value, of TEP.

K-143


Security Ownership of Certain Beneficial Owners
Information concerning the security ownership of certain beneficial owners ofTEP are held by UNS Energy, will be contained in UNS Energy’s Proxy Statement relating to the 2014 Annual Meetingwhich is an indirect, wholly owned subsidiary of Shareholders, which will be filed with the SEC not later than 120 days after December 31, 2013, which information is incorporated herein by reference.
Security Ownership of Management
Information concerning the security ownership of the Directors and Executive Officers of UNS Energy will be contained in UNS Energy’s Proxy Statement relating to the 2014 Annual Meeting of Shareholders, which will be filed with the SEC not later than 120 days after December 31, 2013, which information is incorporated herein by reference.

Securities Authorized for Issuance Under Equity Compensation Plans
Information concerning securities authorized for issuance under equity compensation plans will be contained in UNS Energy’s Proxy Statement relating to the 2014 Annual Meeting of Shareholders, which will be filed with the SEC not later than 120 days after December 31, 2013, which information is incorporated herein by reference.

Fortis.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE
Information concerning certain relationshipsDirector Independence
TEP’s directors are not independent since they are executive officers of TEP and related transactions,UNS Energy. There are no standing committees of the Board of Directors of TEP.
As described in Part III, Item 10. Directors, Executive Officers and director independenceCorporate Governance, above, the Audit and Risk Committee of the UNS Energy Board of Directors is responsible for overseeing the accounting and financial reporting process and audits of the financial statements of UNS Energy and its consolidated subsidiaries, including TEP.
As described in Part III, Item 11, Executive Compensation, above, the Human Resources and Governance Committee of the UNS Energy Board of Directors is responsible for overseeing the executive compensation policies and practices of UNS Energy and its consolidated subsidiaries, including TEP.
The Board of Directors of UNS Energy has adopted Director Independence Standards that comply with New York Stock Exchange (NYSE) rules for determining independence, among other things, in order to determine eligibility to serve on the Audit and Risk Committee and the Human Resources and Governance Committee of UNS Energy. Neither UNS Energy nor TEP has any securities listed on the NYSE or any other national securities exchange or inter-dealer quotation system requiring that directors or committee members be independent but, in approving the acquisition of UNS Energy by Fortis, the ACC required that a majority of the members of the UNS Energy Board of Directors be independent. The written charters of the UNS Energy Audit and Risk Committee and Human Resources and Governance Committee each require that a majority of the members of each such committee meet both UNS Energy’s Director Independence Standards and independence standards of the NYSE. The UNS Energy Director Independence Standards are available on TEP’s website at www.tep.com/about/investors/.
No director may be deemed independent unless the Board of Directors of UNS Energy affirmatively determines, after due deliberation, that the director has no material relationship with UNS Energy or any of its subsidiaries either directly or as a partner, shareholder or executive officer of an organization that has a relationship with UNS Energy or any of its subsidiaries. In each case, the Board of Directors of UNS Energy broadly considers all the relevant facts and circumstances from the standpoint of the director as well as from that of persons or organizations with which the director has an affiliation and applies these standards.
Annually, the UNS Energy board determines whether each director meets the criteria of independence. Based upon the foregoing criteria, the UNS Energy board has deemed each director of UNS Energy to be independent, with the exception of Messrs. Hutchens, Perry, and Laurito. Mr. Hutchens is the President and Chief Executive Officer of UNS Energy and TEP. Mr. Perry is an executive officer of Fortis. Mr. Laurito is an executive officer of Central Hudson Gas and Electric Corporation, another wholly owned subsidiary of Fortis. For each other director who is deemed independent, there were no other significant transactions, relationships or arrangements that were considered by the UNS Energy board in determining that the director is independent. See Transactions with Related Persons, below.
Each member of UNS Energy’s Audit and Risk Committee and Human Resources and Governance Committee meets the independence criteria of both the Director Independence Standards and the NYSE listing standards, with the exception of Mr. Perry, who is an executive officer of Fortis, and Mr. Laurito, who is an executive officer of Central Hudson Gas and Electric Corporation. Mr. Hutchens is not a member of either committee.

115



Transactions with Related Persons
The UNS Energy Board of Directors has adopted a written Policy on Review of Transactions with Related Persons (“Related Person Policy”) under which it reviews related person transactions. The policy is available on TEP’s website at www.tep.com/about/investors/. The Related Person Policy specifies that certain transactions involving directors, executive officers, significant shareholders and certain other related persons in which UNS Energy or its subsidiaries, including TEP, is or will be containeda participant and are of the type required to be reported as a related person transaction under Transactions with ManagementItem 404 of Regulation S-K shall be reviewed by the UNS Energy Audit and Others, Director IndependenceRisk Committee for the purpose of determining whether such transactions are in the best interest of UNS Energy and Compensation Committee Interlocks,its subsidiaries. The Related Person Policy also establishes a requirement for directors and Insider Participationexecutive officers of UNS Energy and its subsidiaries to report transactions involving a related party that exceed $120,000 in UNS Energy’s Proxy Statement relating tovalue. TEP is not aware of any transactions entered into since the 2014 Annual Meetingbeginning of Shareholders, which will be filed withlast year that did not follow the SEC not later than 120 days after December 31, 2013, which information is incorporated herein by reference.

procedures outlined in the Related Person Policy.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES
Information concerning UNS Energy's principal accountant fees and services will be contained in UNS Energy’s Proxy Statement relating to the 2014 Annual Meeting of Shareholders, which will be filed with the SEC not later than 120 days after December 31, 2013, which information is incorporated herein by reference.
Pre-Approved Policies and Procedures
Rules adopted by the SEC in order to implement requirements of the Sarbanes-Oxley Act of 2002 require public company audit committees to pre-approve audit and non-audit services. UNS Energy’s Audit and Risk Committee has adopted a policy pursuant to which audit, audit-related, tax, and other services are pre-approved by category of service. Recognizing that situations may arise where it is in the Company’s best interest for the auditor to perform services in addition to the annual audit of the Company’s financial statements, the policy sets forth guidelines and procedures with respect to approval of the four categories of service designed to achieve the continued independence of the auditor when it is retained to perform such services for UNS Energy. The policy requires the Audit and Risk Committee to be informed of each service and does not include any delegation of the Audit and Risk Committee’s responsibilities to management. The Audit and Risk Committee may delegate to the Chair of the Audit and Risk Committee the authority to grant pre-approvals of audit and non-audit services requiring Audit and Risk Committee approval where the Audit and Risk Committee Chair believes it is desirable to pre-approve such services prior to the next regularly scheduled Audit and Risk Committee meeting. The decisions of the Audit and Risk Committee Chair to pre-approve any such services from one regularly scheduled Audit Committee meeting to the next shall be reported to the Audit and Risk Committee.
Fees
Effective October 7, 2014, PwC was dismissed as the independent auditors and replaced with Ernst and Young LLP (EY) as a result of the Fortis acquisition. The following table details fees paid to PwCEY for professional services during 20122015 and 2013.2014. The Audit and Risk Committee has considered whether the provision of services to TEP by PwC,EY, beyond those rendered in connection with their audit and review of the Company’sTEP’s financial statements, is compatible with maintaining their independence as auditor.

K-144


TEP's fees for principal accountant services are as follows:
 2013 2012
Audit Fees$941,942
 $970,791
Audit-Related Fees46,500
 54,878
Tax Fees(1)
61,612
 186,605
All Other Fees53,273
 10,800
Total$1,103,327
 $1,223,074
Notes:
1)The decrease in tax fees is for work performed by PWC on behalf of the Company’s Tax Services department to evaluate the tax treatment of repairs and review of the TEP tax rate case during 2012.
(in thousands)2015 2014
Audit Fees$1,352
 $1,206
Audit-Related Fees
 
Tax Fees70
 84
All Other Fees
 
Total$1,422
 $1,290
Audit fees include fees for the audit of TEP’s consolidated financial statements included in the Company’sTEP’s Annual Report on Form 10-K and review of financial statements included in the Company’sTEP’s Quarterly Reports on Form 10-Q. Audit fees also include services provided by PwC in connection with the audit of the effectiveness of internal control over financial reporting and on management’s assessment of the effectiveness of internal control over financial reporting, comfort letters, consents and other services related to SEC matters, and financing transactions, and statutory and regulatory audits.

Tax fees reported for 2015 and 2014 include fees for tax appeals, and in 2014 for consulting.

All services performed by our principal accountant are approved in advance by the Audit and Risk Committee in accordance with the Audit and Risk Committee’s pre-approval policy for services provided by the Independent Registered Public Accounting Firm.

K-145116


PART IV
ITEM 15. EXHIBITS, AND FINANCIAL STATEMENT SCHEDULE
SCHEDULES
 
Page
(a) (1) Consolidated Financial Statements as of December 31, 20132015 and 20122014 and for Each of the Three Years in the Period Ended December 31, 20132015 
  
UNS Energy Corporation
Consolidated Statements of Changes in Stockholders’ Equity
Notes to Consolidated Financial Statements
Tucson Electric Power Company
Report of Independent Registered Public Accounting Firm
Consolidated Statements of Income
Consolidated Statements of Comprehensive Income
Consolidated Statements of Cash Flows
Consolidated Balance Sheets
Consolidated Statements of Capitalization
Consolidated Statements of Changes in Stockholder’s Equity
Notes to Consolidated Financial Statements
  
(2) Financial Statement Schedule 
Schedule IIAll schedules have been omitted because they are either not applicable, not required or the information required to be set forth therein is included on the Consolidated Financial Statements or notes thereto. 
Valuation and Qualifying Accounts
  
(3) Exhibits 
Reference is made to the Exhibit Index commencing on page 119.
Reference is made to the Exhibit Index commencing on page K-150.


K-146117




SIGNATURES
Pursuant to the requirements of Section 13 and 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
   TUCSON ELECTRIC POWER COMPANY
  UNS ENERGY CORPORATION(Registrant)
   
Date:February 25, 2014By:18, 2016 /s/ Kevin P. Larson
   Kevin P. Larson
   Senior Vice President and Chief
Financial Officer
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
    
Date:February 25, 201418, 2016 /s/ Paul J. Bonavia*David G. Hutchens*
   Paul J. BonaviaDavid G. Hutchens
   Chairman of the Board andPresident, Chief Executive Officer, and Director
   (Principal Executive Officer)
   
Date:February 25, 201418, 2016 /s/ Kevin P. Larson
   Kevin P. Larson
Senior Vice President and Chief Financial Officer
(Principal Financial Officer)
Date:February 25, 2014/s/ Frank P. Marino*
Frank P. Marino
Vice President and Controller
(Principal Accounting Officer)
Date:February 25, 2014/s/ Lawrence J. Aldrich*
Lawrence J. Aldrich
Director
Date:February 25, 2014/s/ Barbara M. Baumann*
Barbara M. Baumann
Director
Date:February 25, 2014/s/ Larry W. Bickle*
Larry W. Bickle
Director
Date:February 25, 2014/s/ Robert A. Elliott*
Robert A. Elliott
Director

K-147



Date:February 25, 2014/s/ Daniel W.L. Fessler*
Daniel W.L. Fessler
Director
Date:February 25, 2014/s/ Louise L. Francesconi*
Louise L. Francesconi
Director
Date:February 25, 2014/s/ Ramiro Peru*
Ramiro Peru
Director
Date:February 25, 2014/s/ Gregory A. Pivirotto*
Gregory A. Pivirotto
Director
Date:February 25, 2014/s/ Joaquin Ruiz*
Joaquin Ruiz
Director
Date:February 25, 2014By:/s/ Kevin P. Larson
Kevin P. Larson
As attorney-in-fact for each of the persons indicated

Pursuant to the requirements of Section 13 and 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
TUCSON ELECTRIC POWER COMPANY
Date:February 25, 2014By:/s/ Kevin P. Larson
Kevin P. Larson
Senior Vice President and Chief Financial Officer
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

K-148



Date:February 25, 2014/s/ Paul J. Bonavia*
Paul J. Bonavia
Chairman of the Board and Chief Executive Officer
(Principal Executive Officer)
Date:February 25, 2014/s/ Kevin P. Larson
Kevin P. Larson
   Senior Vice President, Chief Financial Officer, and Director
   (Principal Financial Officer)
   
Date:February 25, 201418, 2016 /s/ Frank P. Marino*
   Frank P. Marino
   Vice President and Controller
   (Principal Accounting Officer)
   
Date:February 25, 201418, 2016 /s/ David G. Hutchens*Todd C. Hixon*
   David G. HutchensTodd C. Hixon
   Director
   
Date:February 25, 201418, 2016By:/s/ Kevin P. Larson
   Kevin P. Larson
   *As attorney-in-fact for each of the persons indicated


K-149118





EXHIBIT INDEX
*2(a) Agreement and Plan of Merger, dated as of December 11, 2013, among FortisUS Inc., Color Acquisition Sub Inc., UNS Energy Corporation and solely for purposes of Section 5.5(a) and 8.15, Fortis Inc. (Form 8-K, dated December 12, 2013, File No. 1-137391-05924 - Exhibit 2.1).
   
*2(b)2(a)(1)Asset Purchase and Sale Agreement, dated as of December 23, 2013, between Gila River Power LLC and Tucson Electric Power Company and UNS Electric, Inc. (Form 8-K, dated December 27, 2013, File No. 1-13739 - Exhibit 2.1)
2(b)(2) First Amendment to the Agreement and Plan of Merger, dated Februaryas of August 14, 2014, to the Asset Purchaseby and Sale Agreement between Gila River Power LLC and Tucson Electric Power Companyamong FortisUS Inc., Color Acquisition Sub Inc. and UNS Electric, Inc.Energy Corporation (Form 8-K, dated August 14, 2014, File No. 1-05924 - Exhibit 2.2).
   
*3(a) Restated Articles of Incorporation of TEP, filed with the ACC on August 11, 1994, as amended by Amendment to Article Fourth of our Restated Articles of Incorporation, filed with the ACC on May 17, 1996. (Form 10-K for the year ended December 31, 1996, File No. 1-5924-Exhibit1-05924 - Exhibit No 3(a)).
   
*3(a)(1) TEP Articles of Amendment filed with the ACC on September 3, 2009 (Form 10-K for the year ended December 31, 2010, File No. 1-1379 –1-05924 - Exhibit 3(a)).
   
*3(b) Bylaws of TEP, as amended as of August 31, 200912, 2015 (Form 10-Q for the quarter ended September 30, 2009,2015, File No. 13739 –1-05924 - Exhibit 3.1)3).
   
*3(c) Amended and RestatedAmendment to Articles of Incorporation of UNS Energy as amended.Corporation, creating series of Limited Voting Junior Preferred Stock (Form 8-K dated May 10, 2012,August 12, 2015, File No. 1-13739 –1-05924 - Exhibit 3.1)3.2).
   
*3(d)Revised and restated bylaws of UNS Energy, as revised and restated December 14, 2011 (Form 8-K, dated December 15, 2011, File No. 13739 – Exhibit 3.1)
*4(a)(1)Loan Agreement, dated as of October 1, 1982, between the Pima County Authority and TEP relating to Floating Rate Monthly Demand Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Irvington Project). (Form 10-Q for the quarter ended September 30, 1982, File No. 1-5924 — Exhibit 4(a)).
*4(a)(2)Indenture of Trust, dated as of October 1, 1982, between the Pima County Authority and Morgan Guaranty authorizing Floating Rate Monthly Demand Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Irvington Project). (Form 10-Q for the quarter ended September 30, 1982, File No. 1-5924 — Exhibit 4(b)).
*4(a)(3)First Supplemental Loan Agreement, dated as of March 31, 1992, between the Pima County Authority and TEP relating to Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Irvington Project). (Form S-4, Registration No. 33-52860 — Exhibit 4(h)(3)).
*4(a)(4)First Supplemental Indenture of Trust, dated as of March 31, 1992, between the Pima County Authority and Morgan Guaranty relating to Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Irvington Project). (Form S-4, Registration No. 33-52860 — Exhibit 4(h)(4)).
*4(b)(1)Loan Agreement, dated as of December 1, 1982, between the Pima County Authority and TEP relating to Floating Rate Monthly Demand Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Projects). (Form 10-K for the year ended December 31, 1982, File No. 1-5924 — Exhibit 4(k)(1)).

K-150



*4(b)(2)Indenture of Trust dated as of December 1, 1982, between the Pima County Authority and Morgan Guaranty authorizing Floating Rate Monthly Demand Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Projects). (Form 10-K for the year ended December 31, 1982, File No. 1-5924 — Exhibit 4(k)(2)).
*4(b)(3)First Supplemental Loan Agreement, dated as of March 31, 1992, between the Pima County Authority and TEP relating to Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Projects). (Form S-4, Registration No. 33-52860 — Exhibit 4(i)(3)).
*4(b)(4)First Supplemental Indenture of Trust, dated as of March 31, 1992, between the Pima County Authority and Morgan Guaranty relating to Industrial Development Revenue Bonds, 1982 Series A (Tucson Electric Power Company Projects). (Form S-4, Registration No. 33-52860 — Exhibit 4(i)(4)).
*4(c)(1) Indenture of Trust, dated as of March 1, 2008, between The Industrial Development Authority of the County of Pima and U.S. Bank Trust National Association authorizing Industrial Development Revenue Bonds, 2008 Series A (Tucson Electric Power Company Project). (Form 8-K dated March 19, 2008, File Nos. 1-5924 and 1-13739 —No. 1-05924 - Exhibit 4(a)).
   
*4(c)(2) Loan Agreement, dated as of March 1, 2008, between the Industrial Development Authority of the County of Pima and TEP relating to Industrial Development Revenue Bonds, 2008 Series A (Tucson Electric Power Company Project). (Form 8-K dated March 19, 2008, File Nos. 1-5924 and 1-13739 —No. 1-05924 - Exhibit 4(b)).
*4(d)(1) Indenture of Trust, dated as of June 1, 2008, between The Industrial Development Authority of the County of Pima and U.S. Bank Trust National Association authorizing Industrial Development Revenue Bonds, 2008 Series B (Tucson Electric Power Company Project). (Form 8-K dated June 25, 2008, File Nos. 1-5924 and 1-13739 —No. 1-05924 - Exhibit 4(a)).
   
*4(d)(2) Loan Agreement, dated as of June 1, 2008, between The Industrial Development Authority of the County of Pima and TEP relating to Industrial Development Revenue Bonds, 2008 Series B (Tucson Electric Power Company Project). (Form 8-K dated June 25, 2008, File Nos. 1-5924 and 1-13739 —No. 1-05924 - Exhibit 4(b)).
   
*4(e)(1) Indenture of Trust, dated as of October 1, 2009, between The Industrial Development Authority of the County of Pima and U.S. Bank Trust National Association authorizing Pollution Control Revenue Bonds, 2009 Series A (Tucson Electric Power Company Navajo Project). (Form 8-K dated October 13, 2009, File No. 1-13739-1-05924 - Exhibit 4(A)).
   
*4(e)(2) Loan Agreement, dated as of October 1, 2009, between The Industrial Development Authority of the County of Pima and TEP relating to Pollution Control Revenue Bonds, 2009 Series A (Tucson Electric Power Company San Juan Project). (Form 8-K dated October 13, 2009, File No. 1-13739-1-05924 - Exhibit 4(B)).
   
*4(f)(1) Indenture of Trust, dated as of October 1, 2009, between Coconino County, Arizona Pollution Control Corporation and U.S. Bank Trust National Association authorizing Pollution Control Revenue Bonds, 2009 Series A (Tucson Electric Power Company Navajo Project). (Form 8-K dated October 13, 2009, File No. 1-13739-1-05924 - Exhibit 4(C)).

119




   
*4(f)(2) Loan Agreement, dated as of October 1, 2009, between Coconino County, Arizona Pollution Control Corporation and TEP relating to Pollution Control Revenue Bonds, 2009 Series A (Tucson Electric Power Company Navajo Project). (Form 8-K dated October 13, 2009, File No. 1-13739-1-05924 - Exhibit 4(D)).
   

K-151



*4(g)(1) Indenture of Trust, dated as of October 1, 2010, between the Industrial Development Authority of the County of Pima and U.S. Bank Trust National Association, authorizing Industrial Development Revenue Bonds, 2010 Series A (Tucson Electric Power Company Project). (Form 8-K dated October 8, 2010, File No. 1-137391-05924 Exhibit 4(a)).
   
*4(g)(2) Loan Agreement, dated as of October 1, 2010, between the Industrial Development Authority of the County of Pima and TEP, relating to Industrial Development Revenue Bonds, 2010 Series A (Tucson Electric Power Company Project). (Form 8-K dated October 8, 2010, File No. 1-137391-05924 - Exhibit 4(b)).
   
*4(h)(1) Indenture of Trust, dated as of December 1, 2010, between the Coconino County, Arizona Pollution Control Corporation and U.S. Bank Trust National Association authorizing Pollution Control Bonds, 2010 Series A (Tucson Electric Power Company Navajo Project). (Form 8-K dated December 17, 2010, File No. 1-13739,1-05924 - Exhibit 4(c)).
   
*4(h)(2) Loan Agreement, dated as of December 1, 2010, between the Coconino County, Arizona Pollution Control Corporation and TEP relating to Pollution Control Bonds, 2010 Series A (Tucson Electric Power Company Navajo Project). (Form 8-K dated December 17, 2010, File No. 1-13739,1-05924 - Exhibit 4(d)).
   
*4(i)(1) Indenture of Trust, dated as of March 1, 2012, between The Industrial Development Authority of the County of Apache and U.S. Bank Trust National Association, authorizing Pollution Control Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project). (Form 8-K dated March 21, 2012, File No. 1-13739,1-05924 - Exhibit 4(a)).
   
*4(i)(2) Loan Agreement, dated as of March 1, 2012, between The Industrial Development Authority of the County of Apache and TEP, relating to Pollution Control Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project). (Form 8-K dated March 21, 2012, File No. 1-13739,1-05924 - Exhibit 4(b)).
   
*4(j)(1) Indenture of Trust, dated as of June 1, 2012, between The Industrial Development Authority of the County of Pima and U.S. Bank Trust National Association, authorizing Industrial Development Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project). (Form 8-K dated June 21, 2012, File No. 1-13739,1-05924 - Exhibit 4(a)).
   
*4(j)(2) Loan Agreement, dated as of June 1, 2012, between The Industrial Development Authority of the County of Pima and TEP, relating to Industrial Development Revenue Bonds, 2012 Series A (Tucson Electric Power Company Project). (Form 8-K dated June 21, 2012, File No. 1-13739,1-05924 - Exhibit 4(b)).
   
*4(k)(1) Indenture of Trust, dated as of March 1, 2013, between The Industrial Development Authority of the County of Pima and U.S. Bank Trust National Association, authorizing Industrial Development Revenue Bonds, 2013 Series A (Tucson Electric Power Company Project). (Form 8-K dated March 14, 2013, File No. 1-13739,1-05924 - Exhibit 4(a)).
   
*4(k)(2) Loan Agreement, dated as of March 1, 2013, between The Industrial Development Authority of the County of Pima and TEP, relating to Industrial Development Revenue Bonds, 2013 Series A (Tucson Electric Power Company Project). (Form 8-K dated March 14, 2013, File No. 1-13739,1-05924 - Exhibit 4(b)).
   
*4(l)(1) Indenture of Trust, dated as of November 1, 2013, between The Industrial Development Authority of the County of Apache and U.S. Bank Trust National Association, authorizing Industrial Development Revenue Bonds, 2013 Series A (Tucson Electric Power Company Springerville Project). (Form 8-K dated November 14, 2013, File No. 1-137391-05924 - Exhibit 4(a)).
   

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*4(l)(2) Loan Agreement, dated as of November 1, 2013, between The Industrial Development Authority of the County of Apache and Tucson Electric Power Company, relating to Industrial Development Revenue Bonds, 2013 Series A (Tucson Electric Power Company Springerville Project). (Form 8-K dated November 14, 2013, File No. 1-137391-05924 - Exhibit 4(b)).
   
*4(l)(3) Lender Rate Mode Covenants Agreement, dated as of November 1, 2013, between Tucson Electric Power Company and STI Institutional & Government, Inc. (Form 8-K dated November 14, 2013, File No. 1-137391-05924 - Exhibit 4(c)).
   
*4(l)(4)Amendment, dated May 26, 2015, between Tucson Electric Power Company, STI Institutional & Government, Inc., and Branch Banking and Trust Company, to Lender Rate Made Covenants Agreement, dated November 1, 2013 (Form 10-Q for the quarter ended June 30, 2015, File No. 1-05924 - Exhibit 4).
  
*4(m)(1) Indenture, dated November 1, 2011, between Tucson Electric Power Company and U.S. Bank National Association, as trustee, authorizing unsecured Notes (Form 8-K dated November 8, 2011, File 1-13739 —1-05924 - Exhibit 4.1).
   
*4(m)(2) Officers Certificate, dated November 8, 2011, authorizing 5.15% Notes due 2021. (Form 8-K dated November 8, 2011, File No. 1-137391-05924 - Exhibit 4.2).
   
*4(m)(3) Officers Certificate, dated September 14, 2012, authorizing 3.85% Notes due 2023. (Form 8-K dated September 14, 2012, File No. 1-137391-05924 - Exhibit 4.1).
*4(n)(1)Note Purchase and Guaranty Agreement dated August 11, 2003 among UNS Gas, Inc., UniSource Energy Services, Inc., and certain institutional investors. (Form 8-K dated August 21, 2003, File Nos. 1-5924 and 1-13739 — Exhibit 99.2).
*4(o)(2)Note Purchase Agreement, dated as of May 4, 2011, among UNS Gas, Inc., UniSource Energy Services, Inc., and a group of purchasers. (Form 8-K dated August 12, 2011, File 1-13739 — Exhibit 4.1).
   
*4(p)4(m)(4) Note Purchase and Guaranty AgreementOfficer's Certificate, dated August 5, 2008, among UNS Electric, Inc., UniSource Energy Services, Inc., and certain institutional investors. (Form 10-Q for the quarter ended June 30, 2008, File Nos. 1-5924 and 1-13739 — Exhibit 4).
*4(q)(1)Second Amended and Restated Credit Agreement, dated as of November 9, 2010, among UNS Energy Corporation, Union Bank, N.A., as Administrative Agent, and a group of lenders.March 10, 2014, authorizing 5.00% Senior Notes due 2044 (Form 8-K dated November 15, 2010,March 10, 2014, File No. 1-13739,1-05924 - Exhibit 4.1).
   
*4(q)(2)4(m)(5) Second Amended and Restated Pledge Agreement,Officer's Certificate, dated as of November 9, 2010, among UNS Energy Corporation, Union Bank, N.A., as Administrative Agent, and a group of lenders.February 27, 2015, authorizing 3.05% Senior Notes due 2025 (Form 8-K dated November 15, 2010,February 27, 2015, File No. 1-13739,1-05924 - Exhibit 4.2).
*4(q)(3)Amendment No. 1 to Second Amended and Restated Credit Agreement, dated as of November 18, 2011, among UNS Energy Corporation, Union Bank, N.A., as Administrative Agent, and a group of lenders. (Form 10-K for the year ended December 31, 2011, File No. 1-13739, Exhibit 4(s)(2)4(a)).
   
*4(r)4(o)(1)Second Amended and Restated Credit Agreement, dated as of November 9, 2010, among Tucson Electric Power Company, Union Bank, N.A., as Administrative Agent, and a group of lenders. (Form 8-K dated November 15, 2010, File No. 1-13739, Exhibit 4.3).
*4(r)(2)Amendment No. 1 to Second Amended and Restated Credit Agreement, dated as of November 18, 2011, among Tucson Electric Power Company, Union Bank, N.A., as Administrative Agent, and a group of lenders. (Form 10-K for the year ended December 31, 2011, File No. 1-13739, Exhibit 4(o)(2)).
*4(s)(1)Second Amended and Restated Credit Agreement, dated as of November 9, 2010, among UNS Electric, Inc., UNS Gas, Inc., UniSource Energy Services, Inc., Union Bank, N.A., as Administrative Agent, and a group of lenders. (Form 8-K dated November 15, 2010, File No. 1-13739, Exhibit 4.4).

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*4(s)(2)Amendment No. 1 to Second Amended and Restated Credit Agreement, dated as of November 18, 2011, among UNS Electric, Inc., UNS Gas, Inc., UniSource Energy Services, Inc., Union Bank, N.A., as Administrative Agent, and a group of lenders. (Form 10-K for the year ended December 31, 2011, File No. 1-13739, Exhibit 4(t)(2)).
*4(t)(1) Reimbursement Agreement, dated as of December 14, 2010, among TEP, as Borrower, the financial institutions from time to time, parties thereto and JPMorgan Chase Bank, N.A., as Administrative Agent and as Issuing Bank. (Form 8-K dated December 17, 2010, File No. 1-13739,1-05924 - Exhibit 4(a)).
   
4(t)*4(o)(2) Amendment No. 1 to Reimbursement Agreement, dated as of February 11, 2014 among TEP, as Borrower, the financial institutions from time to time, parties thereto and JPMorgan Chase Bank, N.A., as Administrative Agent and as Issuing Bank.
*4(u)(1)Credit Agreement, dated as of August 10, 2011, among UNS Electric, Inc., UniSource Energy Services, Inc., and Union Bank N.A., as Administrative Agent (Form 8-K dated August 12, 2011, File 1-13739 — Exhibit 4.2).
*10(a)(1)Lease Agreements, dated as of December 1, 1984, between Valencia and United States Trust Company of New York, as Trustee, and Thomas B. Zakrzewski, as Co-Trustee, as amended and supplemented. (Form 10-K for the year ended December 31, 1984,2013, File No. 1-5924 —1-05924 - Exhibit 10(d)(1)).
*10(a)(2)Guaranty and Agreements, dated as of December 1, 1984, between TEP and United States Trust Company of New York, as Trustee, and Thomas B. Zakrzewski, as Co-Trustee. (Form 10-K for the year ended December 31, 1984, File No. 1-5924 — Exhibit 10(d)4(t)(2)).
   
*10(a)(3)4(r)(1) General Indemnity Agreements, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors; General Foods Credit Corporation, Harvey Hubbell Financial, Inc. and J.C. Penney Company, Inc. as Owner Participants; United States Trust Company of New York, as Owner Trustee; Teachers Insurance and Annuity Association of America as Loan Participant; and Marine Midland Bank, N.A., as Indenture Trustee. (Form 10-K for the year ended December 31, 1984, File No. 1-5924 — Exhibit 10(d)(3)).
*10(a)(4)Tax Indemnity Agreements, dated as of December 1, 1984, between General Foods Credit Corporation, Harvey Hubbell Financial, Inc. and J.C. Penney Company, Inc., each as Beneficiary under a separate Trust Agreement dated December 1, 1984, with United States Trust of New York as Owner Trustee, and Thomas B. Zakrzewski as Co-Trustee, Lessor, and Valencia, Lessee, and TEP, Indemnitors. (Form 10-K for the year ended December 31, 1984, File No. 1-5924 — Exhibit 10(d)(4)).
*10(a)(5)Amendment No. 1, dated December 31, 1984, to the Lease Agreements, dated December 1, 1984, between Valencia and United States Trust Company of New York, as Owner Trustee, and Thomas B. Zakrzewski as Co-Trustee. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(5)).
*10(a)(6)Amendment No. 2, dated April 1, 1985, to the Lease Agreements, dated December 1, 1984, between Valencia and United States Trust Company of New York, as Owner Trustee, and Thomas B. Zakrzewski as Co-Trustee. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(6)).
*10(a)(7)Amendment No. 3 dated August 1, 1985, to the Lease Agreements, dated December 1, 1984, between Valencia and United States Trust Company of New York, as Owner Trustee, and Thomas Zakrzewski as Co-Trustee. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(7)).



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*10(a)(8)Amendment No. 4, dated June 1, 1986, to the Lease Agreement, dated December 1, 1984, between Valencia and United States Trust Company of New York as Owner Trustee, and Thomas Zakrzewski as Co-Trustee, under a Trust Agreement, dated as of December 1, 1984, with General Foods Credit CorporationOctober 15, 2015, among Tucson Electric Power Company, MUFG Union Bank, N.A. as Owner Participant.Administrative Agent, and a group of lenders (Form 10-K for the year ended December 31, 1986,8-K dated October 15, 2015, File No. 1-5924 —1-05924 - Exhibit 10(e)(8)).
*10(a)(9)Amendment No. 4, dated June 1, 1986, to the Lease Agreement, dated December 1, 1984, between Valencia and United States Trust Company of New York as Owner Trustee, and Thomas Zakrzewski as Co-Trustee, under a Trust Agreement dated as of December 1, 1984, with J.C. Penney Company, Inc. as Owner Participant. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(9)).
*10(a)(10)Amendment No. 4, dated June 1, 1986, to the Lease Agreement, dated December 1, 1984, between Valencia and United States Trust Company of New York as Owner Trustee, and Thomas Zakrzewski as Co-Trustee, under a Trust Agreement dated as of December 1, 1984, with Harvey Hubbell Financial Inc. as Owner Participant. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(10)).
*10(a)(11)Lease Amendment No. 5 and Supplement No. 2, to the Lease Agreement, dated July 1, 1986, between Valencia, United States Trust Company of New York as Owner Trustee, and Thomas Zakrzewski as Co-Trustee and J.C. Penney as Owner Participant. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(11)).
*10(a)(12)Lease Amendment No. 5, to the Lease Agreement, dated June 1, 1987, between Valencia, United States Trust Company of New York as Owner Trustee, and Thomas Zakrzewski as Co-Trustee and General Foods Credit Corporation as Owner Participant. (Form 10-K for the year ended December 31, 1988, File No. 1-5924 — Exhibit 10(f)(12)).
*10(a)(13)Lease Amendment No. 5, to the Lease Agreement, dated June 1, 1987, between Valencia, United States Trust Company of New York as Owner Trustee, and Thomas Zakrzewski as Co-Trustee and Harvey Hubbell Financial Inc. as Owner Participant. (Form 10-K for the year ended December 31, 1988, File No. 1-5924 — Exhibit 10(f)(13)).
*10(a)(14)Lease Amendment No. 6, to the Lease Agreement, dated June 1, 1987, between Valencia, United States Trust Company of New York as Owner Trustee, and Thomas Zakrzewski as Co-Trustee and J.C. Penney Company, Inc. as Owner Participant. (Form 10-K for the year ended December 31, 1988, File No. 1-5924 — Exhibit 10(f)(14)).
*10(a)(15)Lease Supplement No. 1, dated December 31, 1984, to Lease Agreements, dated December 1, 1984, between Valencia, as Lessee and United States Trust Company of New York and Thomas B. Zakrzewski, as Owner Trustee and Co-Trustee, respectively (document filed relates to General Foods Credit Corporation; documents relating to Harvey Hubbell Financial, Inc. and JC Penney Company, Inc. are not filed but are substantially similar). (Form S-4 Registration No. 33-52860 — Exhibit 10(f)(15)).
*10(a)(16)Amendment No. 1, dated June 1, 1986, to the General Indemnity Agreement, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors, General Foods Credit Corporation, as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(12)).
*10(a)(17)Amendment No. 1, dated June 1, 1986, to the General Indemnity Agreement, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors, J.C. Penney Company, Inc., as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(13)).

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*10(a)(18)Amendment No. 1, dated June 1, 1986, to the General Indemnity Agreement, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors, Harvey Hubbell Financial, Inc., as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(14)).
*10(a)(19)Amendment No. 2, dated as of July 1, 1986, to the General Indemnity Agreement, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors, J.C. Penney Company, Inc., as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form S-4, Registration No. 33-52860 — Exhibit 10(f)(19)).
*10(a)(20)Amendment No. 2, dated as of June 1, 1987, to the General Indemnity Agreement, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors, General Foods Credit Corporation, as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form S-4, Registration No. 33-52860 —Exhibit 10(f)(20)).
*10(a)(21)Amendment No. 2, dated as of June 1, 1987, to the General Indemnity Agreement, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors, Harvey Hubbell Financial, Inc., as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form S-4, Registration No. 33-52860 — Exhibit 10(f)(21)).
*10(a)(22)Amendment No. 3, dated as of June 1, 1987, to the General Indemnity Agreement, dated as of December 1, 1984, between Valencia and TEP, as Indemnitors, J.C. Penney Company, Inc., as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form S-4, Registration No. 33-52860 — Exhibit 10(f)(22)).
*10(a)(23)Supplemental Tax Indemnity Agreement, dated July 1, 1986, between J.C. Penney Company, Inc., as Owner Participant, and Valencia and TEP, as Indemnitors. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(15)).
*10(a)(24)Supplemental General Indemnity Agreement, dated as of July 1, 1986, among Valencia and TEP, as Indemnitors, J.C. Penney Company, Inc., as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form 10-K for the year ended December 31, 1986, File No. 1-5924 — Exhibit 10(e)(16)).
*10(a)(25)Amendment No. 1, dated as of June 1, 1987, to the Supplemental General Indemnity Agreement, dated as of July 1, 1986, among Valencia and TEP, as Indemnitors, J.C. Penney Company, Inc., as Owner Participant, United States Trust Company of New York, as Owner Trustee, Teachers Insurance and Annuity Association of America, as Loan Participant, and Marine Midland Bank, N.A., as Indenture Trustee. (Form S-4, Registration No. 33-52860 — Exhibit 10(f)(25)).
*10(a)(26)Valencia Agreement, dated as of June 30, 1992, among TEP, as Guarantor, Valencia, as Lessee, Teachers Insurance and Annuity Association of America, as Loan Participant, Marine Midland Bank, N.A., as Indenture Trustee, United States Trust Company of New York, as Owner Trustee, and Thomas B. Zakrzewski, as Co-Trustee, and the Owner Participants named therein relating to the Restructuring of Valencia’s lease of the coal-handling facilities at the Springerville Generating Station. (Form S-4, Registration No. 33-52860 — Exhibit 10(f)(26)).

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*10(a)(27)Amendment, dated as of December 15, 1992, to the Lease Agreements, dated December 1, 1984, between Valencia, as Lessee, and United States Trust Company of New York, as Owner Trustee, and Thomas B. Zakrzewski, as Co-Trustee. (Form S-1, Registration No. 33-55732 — Exhibit 10(f)(27))4.1).
   
*10(b)(1) Lease Agreements, dated as of December 1, 1985, between TEP and San Carlos Resources Inc. (San Carlos) (a wholly-owned subsidiary of the Registrant) jointly and severally, as Lessee, and Wilmington Trust Company, as Trustee, as amended and supplemented. (Form 10-K for the year ended December 31, 1985, File No. 1-5924 —1-05924 - Exhibit 10(f)(1)).
   
*10(b)(2) Tax Indemnity Agreements, dated as of December 1, 1985, between Philip Morris Credit Corporation, IBM Credit Financing Corporation and Emerson Finance Co., each as beneficiary under a separate trust agreement, dated as of December 1, 1985, with Wilmington Trust Company, as Owner Trustee, and William J. Wade, as Co-Trustee, and TEP and San Carlos, as Lessee. (Form 10-K for the year ended December 31, 1985, File No. 1-5924 —1-05924 - Exhibit 10(f)(2)).
   

121




*10(b)(3) Participation Agreement, dated as of December 1, 1985, among TEP and San Carlos as Lessee, Philip Morris Credit Corporation, IBM Credit Financing Corporation, and Emerson Finance Co. as Owner Participants, Wilmington Trust Company as Owner Trustee, The Sumitomo Bank, Limited, New York Branch, as Loan Participant, and Bankers Trust Company, as Indenture Trustee. (Form 10-K for the year ended December 31, 1985, File No. 1-5924 —1-05924 - Exhibit 10(f)(3)).
   
*10(b)(4) Restructuring Commitment Agreement, dated as of June 30, 1992, among TEP and San Carlos, jointly and severally, as Lessee, Philip Morris Credit Corporation, IBM Credit Financing Corporation and Emerson Capital Funding, William J. Wade, as Owner Trustee and Co-Trustee, respectively, The Sumitomo Bank, Limited, New York Branch, as Loan Participant and United States Trust Company of New York, as Indenture Trustee. (Form S-4, Registration No. 33-52860 - Exhibit 10(g)(4)).
   
*10(b)(5) Lease Supplement No.1, dated December 31, 1985, to Lease Agreements, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee Trustee and Co-Trustee, respectively (document filed relates to Philip Morris Credit Corporation; documents relating to IBM Credit Financing Corporation and Emerson Financing Co. are not filed but are substantially similar). (Form S-4, Registration No. 33-52860 - Exhibit 10(g)(5)).
   
*10(b)(6) Amendment No. 1, dated as of December 15, 1992, to Lease Agreements, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, as Lessor. (Form S-1, Registration No. 33-55732 - Exhibit 10(g)(6)).
   
*10(b)(7) Amendment No. 1, dated as of December 15, 1992, to Tax Indemnity Agreements, dated as of December 1, 1985, between Philip Morris Credit Corporation, IBM Credit Financing Corporation and Emerson Capital Funding Corp., as Owner Participants and TEP and San Carlos, jointly and severally, as Lessee. (Form S-1, Registration No. 33-55732 - Exhibit 10(g)(7)).
   
*10(b)(8) Amendment No. 2, dated as of December 1, 1999, to Lease Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, under a Trust Agreement with Philip Morris Capital Corporation as Owner Participant. (Form 10-K for the year ended December 31, 1999, File No. 1-5924 —1-05924 - Exhibit 10(b)(8)).

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*10(b)(9) Amendment No. 2, dated as of December 1, 1999, to Lease Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, under a Trust Agreement with IBM Credit Financing Corporation as Owner Participant. (Form 10-K for the year ended December 31, 1999, File No. 1-5924 —1-05924 - Exhibit 10(b)(9)).
   
*10(b)(10) Amendment No. 2, dated as of December 1, 1999, to Lease Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, under a Trust Agreement with Emerson Finance Co. as Owner Participant. (Form 10-K for the year ended December 31, 1999, File No. 1-5924 —1-05924 - Exhibit 10(b)(10)).
   
*10(b)(11) Amendment No. 2, dated as of December 1, 1999, to Tax Indemnity Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Philip Morris Capital Corporation as Owner Participant, beneficiary under a Trust Agreement dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, together as Lessor. (Form 10-K for the year ended December 31, 1999, File No. 1-5924 —1-05924 - Exhibit 10(b)(11)).
   
*10(b)(12) Amendment No. 2, dated as of December 1, 1999, to Tax Indemnity Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and IBM Credit Financing Corporation as Owner Participant, beneficiary under a Trust Agreement dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, together as Lessor. (Form 10-K for the year ended December 31, 1999, File No. 1-5924 —1-05924 - Exhibit 10(b)(12)).
   

122




*10(b)(13) Amendment No. 2, dated as of December 1, 1999, to Tax Indemnity Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Emerson Finance Co. as Owner Participant, beneficiary under a Trust Agreement dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, together as Lessor. (Form 10-K for the year ended December 31, 1999, File No. 1-5924 —1-05924 - Exhibit 10(b)(13)).
   
*10(b)(14) Amendment No. 3 dated as of June 1, 2003, to Lease Agreements, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, under a Trust Agreement with Philip Morris Capital Corporation as Owner Participant. (Form 10-Q for the quarter ended June 30, 2003, File No. 1-5924 –1-05924 - Exhibit 10(a)).
   
*10(b)(15) Amendment No. 3 dated as of June 1, 2003, to Lease Agreements, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, under a Trust Agreement with IBM Credit, LLC as Owner Participant. (Form 10-Q for the quarter ended June 30, 2003, File No. 1-5924 –1-05924 - Exhibit 10(b)).
   
*10(b)(16) Amendment No. 3 dated as of June 1, 2003, to Lease Agreements, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, under a Trust Agreement with Emerson Finance Co. as Owner Participant. (Form 10-Q for the quarter ended June 30, 2003, File No. 1-5924 –1-05924 - Exhibit 10(c)).
   
*10(b)(17) Amendment No. 3 dated as of June 1, 2003, to Tax Indemnity Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Philip Morris Capital Corporation as Owner Participant, beneficiary under a Trust Agreement dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, together as Lessor. (Form 10-Q for the quarter ended June 30, 2003, File No. 1-5924 –1-05924 - Exhibit 10(d)).
   

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*10(b)(18) Amendment No. 3 dated as of June 1, 2003, to Tax Indemnity Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and IBM Credit, LLC as Owner Participant, beneficiary under a Trust Agreement dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, together as Lessor. (Form 10-Q for the quarter ended June 30, 2003, File No. 1-5924 –1-05924 - Exhibit 10(e)).
   
*10(b)(19) Amendment No. 3 dated as of June 1, 2003, to Tax Indemnity Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Emerson Finance Co. as Owner Participant, beneficiary under a Trust Agreement dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, together as Lessor. (Form 10-Q for the quarter ended June 30, 2003, File No. 1-5924 –1-05924 - Exhibit 10(f)).
   
*10(b)(20) Amendment No. 4, dated as of June 1, 2006, to Lease Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Cotrustee,Co-trustee, respectively, under a Trust Agreement with Philip Morris Capital Corporation as Owner Participant. (Form 8-K dated June 12, 2006, File No. 1-5924 –1-05924 - Exhibit 10.1).
   
*10(b)(21) Amendment No. 4, dated as of June 1, 2006, to Lease Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Cotrustee,Co-trustee, respectively, under a Trust Agreement with Selco Service Corporation as Owner Participant. (Form 8-K dated June 12, 2006, File No. 1-5924 –1-05924 - Exhibit 10.2).
   
*10(b)(22) Amendment No. 4, dated as of June 1, 2006, to Lease Agreement, dated as of December 1, 1985, between TEP and San Carlos, jointly and severally, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Cotrustee,Co-trustee, respectively, under a Trust Agreement with Emerson Finance LLC as Owner Participant. (Form 8-K dated June 12, 2006, File No. 1-5924 –1-05924 - Exhibit 10.3).
   

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*10(b)(23) Amendment No. 4, dated as of June 1, 2006 to Tax Indemnity Agreement, dated as of December 1, 1985, between TEP and San Carlos, as Lessee, and Philip Morris Capital Corporation as Owner Participant, beneficiary under a Trust Agreement, dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Cotrustee,Co-trustee, respectively, together as Lessor. (Form 8-K dated June 12, 2006, File No. 1-5924 –1-05924 - Exhibit 10.4).
   
*10(b)(24) Amendment No. 4, dated as of June 1, 2006 to Tax Indemnity Agreement, , dated as of December 1, 1985, between TEP and San Carlos, as Lessee, and Selco Service Corporation as Owner Participant, beneficiary under a Trust Agreement, dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Cotrustee,Co-trustee, respectively, together as Lessor. (Form 8-K dated June 12, 2006, File No. 1-5924 –1-05924 - Exhibit 10.5).
   
*10(b)(25) Amendment No. 4, dated as of June 1, 2006 to Tax Indemnity Agreement, , dated as of December 1, 1985, between TEP and San Carlos, as Lessee, and Emerson Finance LLC as Owner Participant, beneficiary under a Trust Agreement, dated as of December 1, 1985, with Wilmington Trust Company and William J. Wade, as Owner Trustee and Cotrustee,Co-trustee, respectively, together as Lessor. (Form 8-K dated June 12, 2006, File No. 1-5924 –1-05924 - Exhibit 10.6).
   
*10(c)(1) Participation Agreement, dated as of June 30, 1992, among TEP, as Lessee, various parties thereto, as Owner, Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, and LaSalle National Bank, as Indenture Trustee relating to TEP’s lease of Springerville Unit 1. (Form S-1, Registration No. 33-55732 - Exhibit 10(u)).
   
*10(c)(2) Lease Agreements, dated as of December 15, 1992, between TEP, as Lessee, and Wilmington Trust Company and William J. Wade, as Owner Trustee and Co-Trustee, respectively, as Lessor. (Form S-1, Registration No. 33-55732 - Exhibit 10(v)).

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*10(c)(3) Tax Indemnity Agreements, dated as of December 15, 1992, between the various Owner Participants parties thereto and TEP, as Lessee. (Form S-1, Registration No. 33-55732 - Exhibit 10(w)).
   
*+10(d)Amended and Restated UNS Energy 1994 Outside Director Stock Option Plan of UNS Energy. (Form S-8 dated September 9, 2002, File No. 333-99317).
*10(e)UNS Energy 2006 Omnibus Stock and Incentive Plan. (Form S-8 dated January 31, 2007, File No. 333-140353).
*10(f)UNS Energy Corporation 2011 Omnibus Stock and Incentive Plan. (Form 8-K dated May 10, 2011, File 1-13739 – Exhibit 10.1).
10(g) UNS Energy Officer Change in Control Agreement (including a(a schedule of officers who are covered by the agreement or substantially identical agreements)agreements is filed separately), between UNS Energy and officers of the company.UNS Energy.
   
*10(h)+10(d)(1) Management and Directors Deferred Compensation Plan IISchedule of Officers covered by UNS Energy. (Form S-8 dated December 30, 2008, File No. 333-156491).Energy Officer Change in Control Agreement or substantially Identical Agreements.
   
+*10(i)10(f) Retention Bonus Agreement between Kevin P. Larson and UNS Energy Corporation Severance Pay Plan, as amended (Form 8-K, dated July 27, 2013,November 13, 2014, File No. 1-13739 - Exhibit 10(b)).
*10(j)Severance Agreement between Michael J. DeConcini and Tucson Electric Power Company (Form 8-K, dated July 27, 2013, File No. 1-137391-05924 - Exhibit 10(a)).
   
12(a)+*10(g) UNS Energy Corporation 2015 Share Unit Plan (Form 8-K, dated February 23, 2015, File No. 1-05924-Exhibit 10(a)).
12 Computation of Ratio of Earnings to Fixed Charges – UNS Energy.
12(b)Computation of Ratio of Earnings to Fixed Charges – TEP.Charges.
   
21 Subsidiaries of the Registrants.Registrant.
   
23(a)Consent of Independent Registered Public Accounting Firm – UNS Energy.

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23(b)Consent of Independent Registered Public Accounting Firm – TEP.
24(a)24 Power of Attorney – UNS Energy.
24(b)Power of Attorney – TEP.Attorney.
   
31(a) Certification Pursuant to Section 302 of the Sarbanes-Oxley Act, – UNS Energy, by Paul J. Bonavia.David G. Hutchens.
   
31(b) Certification Pursuant to Section 302 of the Sarbanes-Oxley Act, – UNS Energy, by Kevin P. Larson.
31(c)Certification Pursuant to Section 302 of the Sarbanes-Oxley Act – TEP, by Paul J. Bonavia.
31(d)Certification Pursuant to Section 302 of the Sarbanes-Oxley Act – TEP, by Kevin P. Larson.
   
**32(a)32 Statements of Corporate Officers (pursuant to Section 906 of the Sarbanes-Oxley Act of 2002) - UNS Energy..

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**32(b)101.INS Statements of Corporate Officers (pursuant to Section 906 of the Sarbanes-Oxley Act of 2002) - TEP.XBRL Instance Document
   
101101.SCH The following materials from UNS Energy’s and TEP’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012, formatted in XBRL (Extensible Business Reporting Language):Taxonomy Extension Schema Document
   
101.CAL XBRL Taxonomy Extension Calculation Linkbase Document
   
101.LAB (a)UNS Energy’s and TEP’s (i) Consolidated Statements of Income, (ii) Consolidated Statements of Comprehensive Income (iii) Consolidated Statements of Cash Flows, (iv) Consolidated Balance Sheets, (v) Consolidated Statements of Capitalization, (vi) Consolidated Statements of Changes in Stockholders’ Equity; andXBRL Taxonomy Extension Label Linkbase Document
   
101.PRE XBRL Taxonomy Extension Presentation Linkbase Document
   
101.DEF (b)XBRL Taxonomy Extension Definition Linkbase Document
Notes to Consolidated Financial Statements.
(*)*Previously filed as indicated and incorporated herein by reference.
(+)+Management contracts or compensatory plans or arrangements required to be filed as exhibits to this Form 10-K by itemItem 601(b)(10)(iii) of Regulation S-K.
**Pursuant to Item 601(b)(32)(ii) of Regulation S-K, this certificate is not being “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.


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